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myri10ge: cleanup retrieving of firmware capabilities
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1 /*************************************************************************
2  * myri10ge.c: Myricom Myri-10G Ethernet driver.
3  *
4  * Copyright (C) 2005 - 2007 Myricom, Inc.
5  * All rights reserved.
6  *
7  * Redistribution and use in source and binary forms, with or without
8  * modification, are permitted provided that the following conditions
9  * are met:
10  * 1. Redistributions of source code must retain the above copyright
11  *    notice, this list of conditions and the following disclaimer.
12  * 2. Redistributions in binary form must reproduce the above copyright
13  *    notice, this list of conditions and the following disclaimer in the
14  *    documentation and/or other materials provided with the distribution.
15  * 3. Neither the name of Myricom, Inc. nor the names of its contributors
16  *    may be used to endorse or promote products derived from this software
17  *    without specific prior written permission.
18  *
19  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
20  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
23  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29  * POSSIBILITY OF SUCH DAMAGE.
30  *
31  *
32  * If the eeprom on your board is not recent enough, you will need to get a
33  * newer firmware image at:
34  *   http://www.myri.com/scs/download-Myri10GE.html
35  *
36  * Contact Information:
37  *   <help@myri.com>
38  *   Myricom, Inc., 325N Santa Anita Avenue, Arcadia, CA 91006
39  *************************************************************************/
40
41 #include <linux/tcp.h>
42 #include <linux/netdevice.h>
43 #include <linux/skbuff.h>
44 #include <linux/string.h>
45 #include <linux/module.h>
46 #include <linux/pci.h>
47 #include <linux/dma-mapping.h>
48 #include <linux/etherdevice.h>
49 #include <linux/if_ether.h>
50 #include <linux/if_vlan.h>
51 #include <linux/inet_lro.h>
52 #include <linux/ip.h>
53 #include <linux/inet.h>
54 #include <linux/in.h>
55 #include <linux/ethtool.h>
56 #include <linux/firmware.h>
57 #include <linux/delay.h>
58 #include <linux/version.h>
59 #include <linux/timer.h>
60 #include <linux/vmalloc.h>
61 #include <linux/crc32.h>
62 #include <linux/moduleparam.h>
63 #include <linux/io.h>
64 #include <linux/log2.h>
65 #include <net/checksum.h>
66 #include <net/ip.h>
67 #include <net/tcp.h>
68 #include <asm/byteorder.h>
69 #include <asm/io.h>
70 #include <asm/processor.h>
71 #ifdef CONFIG_MTRR
72 #include <asm/mtrr.h>
73 #endif
74
75 #include "myri10ge_mcp.h"
76 #include "myri10ge_mcp_gen_header.h"
77
78 #define MYRI10GE_VERSION_STR "1.3.2-1.287"
79
80 MODULE_DESCRIPTION("Myricom 10G driver (10GbE)");
81 MODULE_AUTHOR("Maintainer: help@myri.com");
82 MODULE_VERSION(MYRI10GE_VERSION_STR);
83 MODULE_LICENSE("Dual BSD/GPL");
84
85 #define MYRI10GE_MAX_ETHER_MTU 9014
86
87 #define MYRI10GE_ETH_STOPPED 0
88 #define MYRI10GE_ETH_STOPPING 1
89 #define MYRI10GE_ETH_STARTING 2
90 #define MYRI10GE_ETH_RUNNING 3
91 #define MYRI10GE_ETH_OPEN_FAILED 4
92
93 #define MYRI10GE_EEPROM_STRINGS_SIZE 256
94 #define MYRI10GE_MAX_SEND_DESC_TSO ((65536 / 2048) * 2)
95 #define MYRI10GE_MAX_LRO_DESCRIPTORS 8
96 #define MYRI10GE_LRO_MAX_PKTS 64
97
98 #define MYRI10GE_NO_CONFIRM_DATA htonl(0xffffffff)
99 #define MYRI10GE_NO_RESPONSE_RESULT 0xffffffff
100
101 #define MYRI10GE_ALLOC_ORDER 0
102 #define MYRI10GE_ALLOC_SIZE ((1 << MYRI10GE_ALLOC_ORDER) * PAGE_SIZE)
103 #define MYRI10GE_MAX_FRAGS_PER_FRAME (MYRI10GE_MAX_ETHER_MTU/MYRI10GE_ALLOC_SIZE + 1)
104
105 struct myri10ge_rx_buffer_state {
106         struct page *page;
107         int page_offset;
108          DECLARE_PCI_UNMAP_ADDR(bus)
109          DECLARE_PCI_UNMAP_LEN(len)
110 };
111
112 struct myri10ge_tx_buffer_state {
113         struct sk_buff *skb;
114         int last;
115          DECLARE_PCI_UNMAP_ADDR(bus)
116          DECLARE_PCI_UNMAP_LEN(len)
117 };
118
119 struct myri10ge_cmd {
120         u32 data0;
121         u32 data1;
122         u32 data2;
123 };
124
125 struct myri10ge_rx_buf {
126         struct mcp_kreq_ether_recv __iomem *lanai;      /* lanai ptr for recv ring */
127         u8 __iomem *wc_fifo;    /* w/c rx dma addr fifo address */
128         struct mcp_kreq_ether_recv *shadow;     /* host shadow of recv ring */
129         struct myri10ge_rx_buffer_state *info;
130         struct page *page;
131         dma_addr_t bus;
132         int page_offset;
133         int cnt;
134         int fill_cnt;
135         int alloc_fail;
136         int mask;               /* number of rx slots -1 */
137         int watchdog_needed;
138 };
139
140 struct myri10ge_tx_buf {
141         struct mcp_kreq_ether_send __iomem *lanai;      /* lanai ptr for sendq */
142         u8 __iomem *wc_fifo;    /* w/c send fifo address */
143         struct mcp_kreq_ether_send *req_list;   /* host shadow of sendq */
144         char *req_bytes;
145         struct myri10ge_tx_buffer_state *info;
146         int mask;               /* number of transmit slots -1  */
147         int req ____cacheline_aligned;  /* transmit slots submitted     */
148         int pkt_start;          /* packets started */
149         int stop_queue;
150         int linearized;
151         int done ____cacheline_aligned; /* transmit slots completed     */
152         int pkt_done;           /* packets completed */
153         int wake_queue;
154 };
155
156 struct myri10ge_rx_done {
157         struct mcp_slot *entry;
158         dma_addr_t bus;
159         int cnt;
160         int idx;
161         struct net_lro_mgr lro_mgr;
162         struct net_lro_desc lro_desc[MYRI10GE_MAX_LRO_DESCRIPTORS];
163 };
164
165 struct myri10ge_slice_netstats {
166         unsigned long rx_packets;
167         unsigned long tx_packets;
168         unsigned long rx_bytes;
169         unsigned long tx_bytes;
170         unsigned long rx_dropped;
171         unsigned long tx_dropped;
172 };
173
174 struct myri10ge_slice_state {
175         struct myri10ge_tx_buf tx;      /* transmit ring        */
176         struct myri10ge_rx_buf rx_small;
177         struct myri10ge_rx_buf rx_big;
178         struct myri10ge_rx_done rx_done;
179         struct net_device *dev;
180         struct napi_struct napi;
181         struct myri10ge_priv *mgp;
182         struct myri10ge_slice_netstats stats;
183         __be32 __iomem *irq_claim;
184         struct mcp_irq_data *fw_stats;
185         dma_addr_t fw_stats_bus;
186         int watchdog_tx_done;
187         int watchdog_tx_req;
188 };
189
190 struct myri10ge_priv {
191         struct myri10ge_slice_state ss;
192         int tx_boundary;        /* boundary transmits cannot cross */
193         int running;            /* running?             */
194         int csum_flag;          /* rx_csums?            */
195         int small_bytes;
196         int big_bytes;
197         int max_intr_slots;
198         struct net_device *dev;
199         struct net_device_stats stats;
200         spinlock_t stats_lock;
201         u8 __iomem *sram;
202         int sram_size;
203         unsigned long board_span;
204         unsigned long iomem_base;
205         __be32 __iomem *irq_deassert;
206         char *mac_addr_string;
207         struct mcp_cmd_response *cmd;
208         dma_addr_t cmd_bus;
209         struct pci_dev *pdev;
210         int msi_enabled;
211         u32 link_state;
212         unsigned int rdma_tags_available;
213         int intr_coal_delay;
214         __be32 __iomem *intr_coal_delay_ptr;
215         int mtrr;
216         int wc_enabled;
217         int down_cnt;
218         wait_queue_head_t down_wq;
219         struct work_struct watchdog_work;
220         struct timer_list watchdog_timer;
221         int watchdog_resets;
222         int watchdog_pause;
223         int pause;
224         char *fw_name;
225         char eeprom_strings[MYRI10GE_EEPROM_STRINGS_SIZE];
226         char *product_code_string;
227         char fw_version[128];
228         int fw_ver_major;
229         int fw_ver_minor;
230         int fw_ver_tiny;
231         int adopted_rx_filter_bug;
232         u8 mac_addr[6];         /* eeprom mac address */
233         unsigned long serial_number;
234         int vendor_specific_offset;
235         int fw_multicast_support;
236         unsigned long features;
237         u32 max_tso6;
238         u32 read_dma;
239         u32 write_dma;
240         u32 read_write_dma;
241         u32 link_changes;
242         u32 msg_enable;
243 };
244
245 static char *myri10ge_fw_unaligned = "myri10ge_ethp_z8e.dat";
246 static char *myri10ge_fw_aligned = "myri10ge_eth_z8e.dat";
247
248 static char *myri10ge_fw_name = NULL;
249 module_param(myri10ge_fw_name, charp, S_IRUGO | S_IWUSR);
250 MODULE_PARM_DESC(myri10ge_fw_name, "Firmware image name");
251
252 static int myri10ge_ecrc_enable = 1;
253 module_param(myri10ge_ecrc_enable, int, S_IRUGO);
254 MODULE_PARM_DESC(myri10ge_ecrc_enable, "Enable Extended CRC on PCI-E");
255
256 static int myri10ge_max_intr_slots = 1024;
257 module_param(myri10ge_max_intr_slots, int, S_IRUGO);
258 MODULE_PARM_DESC(myri10ge_max_intr_slots, "Interrupt queue slots");
259
260 static int myri10ge_small_bytes = -1;   /* -1 == auto */
261 module_param(myri10ge_small_bytes, int, S_IRUGO | S_IWUSR);
262 MODULE_PARM_DESC(myri10ge_small_bytes, "Threshold of small packets");
263
264 static int myri10ge_msi = 1;    /* enable msi by default */
265 module_param(myri10ge_msi, int, S_IRUGO | S_IWUSR);
266 MODULE_PARM_DESC(myri10ge_msi, "Enable Message Signalled Interrupts");
267
268 static int myri10ge_intr_coal_delay = 75;
269 module_param(myri10ge_intr_coal_delay, int, S_IRUGO);
270 MODULE_PARM_DESC(myri10ge_intr_coal_delay, "Interrupt coalescing delay");
271
272 static int myri10ge_flow_control = 1;
273 module_param(myri10ge_flow_control, int, S_IRUGO);
274 MODULE_PARM_DESC(myri10ge_flow_control, "Pause parameter");
275
276 static int myri10ge_deassert_wait = 1;
277 module_param(myri10ge_deassert_wait, int, S_IRUGO | S_IWUSR);
278 MODULE_PARM_DESC(myri10ge_deassert_wait,
279                  "Wait when deasserting legacy interrupts");
280
281 static int myri10ge_force_firmware = 0;
282 module_param(myri10ge_force_firmware, int, S_IRUGO);
283 MODULE_PARM_DESC(myri10ge_force_firmware,
284                  "Force firmware to assume aligned completions");
285
286 static int myri10ge_initial_mtu = MYRI10GE_MAX_ETHER_MTU - ETH_HLEN;
287 module_param(myri10ge_initial_mtu, int, S_IRUGO);
288 MODULE_PARM_DESC(myri10ge_initial_mtu, "Initial MTU");
289
290 static int myri10ge_napi_weight = 64;
291 module_param(myri10ge_napi_weight, int, S_IRUGO);
292 MODULE_PARM_DESC(myri10ge_napi_weight, "Set NAPI weight");
293
294 static int myri10ge_watchdog_timeout = 1;
295 module_param(myri10ge_watchdog_timeout, int, S_IRUGO);
296 MODULE_PARM_DESC(myri10ge_watchdog_timeout, "Set watchdog timeout");
297
298 static int myri10ge_max_irq_loops = 1048576;
299 module_param(myri10ge_max_irq_loops, int, S_IRUGO);
300 MODULE_PARM_DESC(myri10ge_max_irq_loops,
301                  "Set stuck legacy IRQ detection threshold");
302
303 #define MYRI10GE_MSG_DEFAULT NETIF_MSG_LINK
304
305 static int myri10ge_debug = -1; /* defaults above */
306 module_param(myri10ge_debug, int, 0);
307 MODULE_PARM_DESC(myri10ge_debug, "Debug level (0=none,...,16=all)");
308
309 static int myri10ge_lro = 1;
310 module_param(myri10ge_lro, int, S_IRUGO);
311 MODULE_PARM_DESC(myri10ge_lro, "Enable large receive offload");
312
313 static int myri10ge_lro_max_pkts = MYRI10GE_LRO_MAX_PKTS;
314 module_param(myri10ge_lro_max_pkts, int, S_IRUGO);
315 MODULE_PARM_DESC(myri10ge_lro_max_pkts,
316                  "Number of LRO packets to be aggregated");
317
318 static int myri10ge_fill_thresh = 256;
319 module_param(myri10ge_fill_thresh, int, S_IRUGO | S_IWUSR);
320 MODULE_PARM_DESC(myri10ge_fill_thresh, "Number of empty rx slots allowed");
321
322 static int myri10ge_reset_recover = 1;
323
324 static int myri10ge_wcfifo = 0;
325 module_param(myri10ge_wcfifo, int, S_IRUGO);
326 MODULE_PARM_DESC(myri10ge_wcfifo, "Enable WC Fifo when WC is enabled");
327
328 #define MYRI10GE_FW_OFFSET 1024*1024
329 #define MYRI10GE_HIGHPART_TO_U32(X) \
330 (sizeof (X) == 8) ? ((u32)((u64)(X) >> 32)) : (0)
331 #define MYRI10GE_LOWPART_TO_U32(X) ((u32)(X))
332
333 #define myri10ge_pio_copy(to,from,size) __iowrite64_copy(to,from,size/8)
334
335 static void myri10ge_set_multicast_list(struct net_device *dev);
336 static int myri10ge_sw_tso(struct sk_buff *skb, struct net_device *dev);
337
338 static inline void put_be32(__be32 val, __be32 __iomem * p)
339 {
340         __raw_writel((__force __u32) val, (__force void __iomem *)p);
341 }
342
343 static int
344 myri10ge_send_cmd(struct myri10ge_priv *mgp, u32 cmd,
345                   struct myri10ge_cmd *data, int atomic)
346 {
347         struct mcp_cmd *buf;
348         char buf_bytes[sizeof(*buf) + 8];
349         struct mcp_cmd_response *response = mgp->cmd;
350         char __iomem *cmd_addr = mgp->sram + MXGEFW_ETH_CMD;
351         u32 dma_low, dma_high, result, value;
352         int sleep_total = 0;
353
354         /* ensure buf is aligned to 8 bytes */
355         buf = (struct mcp_cmd *)ALIGN((unsigned long)buf_bytes, 8);
356
357         buf->data0 = htonl(data->data0);
358         buf->data1 = htonl(data->data1);
359         buf->data2 = htonl(data->data2);
360         buf->cmd = htonl(cmd);
361         dma_low = MYRI10GE_LOWPART_TO_U32(mgp->cmd_bus);
362         dma_high = MYRI10GE_HIGHPART_TO_U32(mgp->cmd_bus);
363
364         buf->response_addr.low = htonl(dma_low);
365         buf->response_addr.high = htonl(dma_high);
366         response->result = htonl(MYRI10GE_NO_RESPONSE_RESULT);
367         mb();
368         myri10ge_pio_copy(cmd_addr, buf, sizeof(*buf));
369
370         /* wait up to 15ms. Longest command is the DMA benchmark,
371          * which is capped at 5ms, but runs from a timeout handler
372          * that runs every 7.8ms. So a 15ms timeout leaves us with
373          * a 2.2ms margin
374          */
375         if (atomic) {
376                 /* if atomic is set, do not sleep,
377                  * and try to get the completion quickly
378                  * (1ms will be enough for those commands) */
379                 for (sleep_total = 0;
380                      sleep_total < 1000
381                      && response->result == htonl(MYRI10GE_NO_RESPONSE_RESULT);
382                      sleep_total += 10) {
383                         udelay(10);
384                         mb();
385                 }
386         } else {
387                 /* use msleep for most command */
388                 for (sleep_total = 0;
389                      sleep_total < 15
390                      && response->result == htonl(MYRI10GE_NO_RESPONSE_RESULT);
391                      sleep_total++)
392                         msleep(1);
393         }
394
395         result = ntohl(response->result);
396         value = ntohl(response->data);
397         if (result != MYRI10GE_NO_RESPONSE_RESULT) {
398                 if (result == 0) {
399                         data->data0 = value;
400                         return 0;
401                 } else if (result == MXGEFW_CMD_UNKNOWN) {
402                         return -ENOSYS;
403                 } else if (result == MXGEFW_CMD_ERROR_UNALIGNED) {
404                         return -E2BIG;
405                 } else {
406                         dev_err(&mgp->pdev->dev,
407                                 "command %d failed, result = %d\n",
408                                 cmd, result);
409                         return -ENXIO;
410                 }
411         }
412
413         dev_err(&mgp->pdev->dev, "command %d timed out, result = %d\n",
414                 cmd, result);
415         return -EAGAIN;
416 }
417
418 /*
419  * The eeprom strings on the lanaiX have the format
420  * SN=x\0
421  * MAC=x:x:x:x:x:x\0
422  * PT:ddd mmm xx xx:xx:xx xx\0
423  * PV:ddd mmm xx xx:xx:xx xx\0
424  */
425 static int myri10ge_read_mac_addr(struct myri10ge_priv *mgp)
426 {
427         char *ptr, *limit;
428         int i;
429
430         ptr = mgp->eeprom_strings;
431         limit = mgp->eeprom_strings + MYRI10GE_EEPROM_STRINGS_SIZE;
432
433         while (*ptr != '\0' && ptr < limit) {
434                 if (memcmp(ptr, "MAC=", 4) == 0) {
435                         ptr += 4;
436                         mgp->mac_addr_string = ptr;
437                         for (i = 0; i < 6; i++) {
438                                 if ((ptr + 2) > limit)
439                                         goto abort;
440                                 mgp->mac_addr[i] =
441                                     simple_strtoul(ptr, &ptr, 16);
442                                 ptr += 1;
443                         }
444                 }
445                 if (memcmp(ptr, "PC=", 3) == 0) {
446                         ptr += 3;
447                         mgp->product_code_string = ptr;
448                 }
449                 if (memcmp((const void *)ptr, "SN=", 3) == 0) {
450                         ptr += 3;
451                         mgp->serial_number = simple_strtoul(ptr, &ptr, 10);
452                 }
453                 while (ptr < limit && *ptr++) ;
454         }
455
456         return 0;
457
458 abort:
459         dev_err(&mgp->pdev->dev, "failed to parse eeprom_strings\n");
460         return -ENXIO;
461 }
462
463 /*
464  * Enable or disable periodic RDMAs from the host to make certain
465  * chipsets resend dropped PCIe messages
466  */
467
468 static void myri10ge_dummy_rdma(struct myri10ge_priv *mgp, int enable)
469 {
470         char __iomem *submit;
471         __be32 buf[16] __attribute__ ((__aligned__(8)));
472         u32 dma_low, dma_high;
473         int i;
474
475         /* clear confirmation addr */
476         mgp->cmd->data = 0;
477         mb();
478
479         /* send a rdma command to the PCIe engine, and wait for the
480          * response in the confirmation address.  The firmware should
481          * write a -1 there to indicate it is alive and well
482          */
483         dma_low = MYRI10GE_LOWPART_TO_U32(mgp->cmd_bus);
484         dma_high = MYRI10GE_HIGHPART_TO_U32(mgp->cmd_bus);
485
486         buf[0] = htonl(dma_high);       /* confirm addr MSW */
487         buf[1] = htonl(dma_low);        /* confirm addr LSW */
488         buf[2] = MYRI10GE_NO_CONFIRM_DATA;      /* confirm data */
489         buf[3] = htonl(dma_high);       /* dummy addr MSW */
490         buf[4] = htonl(dma_low);        /* dummy addr LSW */
491         buf[5] = htonl(enable); /* enable? */
492
493         submit = mgp->sram + MXGEFW_BOOT_DUMMY_RDMA;
494
495         myri10ge_pio_copy(submit, &buf, sizeof(buf));
496         for (i = 0; mgp->cmd->data != MYRI10GE_NO_CONFIRM_DATA && i < 20; i++)
497                 msleep(1);
498         if (mgp->cmd->data != MYRI10GE_NO_CONFIRM_DATA)
499                 dev_err(&mgp->pdev->dev, "dummy rdma %s failed\n",
500                         (enable ? "enable" : "disable"));
501 }
502
503 static int
504 myri10ge_validate_firmware(struct myri10ge_priv *mgp,
505                            struct mcp_gen_header *hdr)
506 {
507         struct device *dev = &mgp->pdev->dev;
508
509         /* check firmware type */
510         if (ntohl(hdr->mcp_type) != MCP_TYPE_ETH) {
511                 dev_err(dev, "Bad firmware type: 0x%x\n", ntohl(hdr->mcp_type));
512                 return -EINVAL;
513         }
514
515         /* save firmware version for ethtool */
516         strncpy(mgp->fw_version, hdr->version, sizeof(mgp->fw_version));
517
518         sscanf(mgp->fw_version, "%d.%d.%d", &mgp->fw_ver_major,
519                &mgp->fw_ver_minor, &mgp->fw_ver_tiny);
520
521         if (!(mgp->fw_ver_major == MXGEFW_VERSION_MAJOR
522               && mgp->fw_ver_minor == MXGEFW_VERSION_MINOR)) {
523                 dev_err(dev, "Found firmware version %s\n", mgp->fw_version);
524                 dev_err(dev, "Driver needs %d.%d\n", MXGEFW_VERSION_MAJOR,
525                         MXGEFW_VERSION_MINOR);
526                 return -EINVAL;
527         }
528         return 0;
529 }
530
531 static int myri10ge_load_hotplug_firmware(struct myri10ge_priv *mgp, u32 * size)
532 {
533         unsigned crc, reread_crc;
534         const struct firmware *fw;
535         struct device *dev = &mgp->pdev->dev;
536         struct mcp_gen_header *hdr;
537         size_t hdr_offset;
538         int status;
539         unsigned i;
540
541         if ((status = request_firmware(&fw, mgp->fw_name, dev)) < 0) {
542                 dev_err(dev, "Unable to load %s firmware image via hotplug\n",
543                         mgp->fw_name);
544                 status = -EINVAL;
545                 goto abort_with_nothing;
546         }
547
548         /* check size */
549
550         if (fw->size >= mgp->sram_size - MYRI10GE_FW_OFFSET ||
551             fw->size < MCP_HEADER_PTR_OFFSET + 4) {
552                 dev_err(dev, "Firmware size invalid:%d\n", (int)fw->size);
553                 status = -EINVAL;
554                 goto abort_with_fw;
555         }
556
557         /* check id */
558         hdr_offset = ntohl(*(__be32 *) (fw->data + MCP_HEADER_PTR_OFFSET));
559         if ((hdr_offset & 3) || hdr_offset + sizeof(*hdr) > fw->size) {
560                 dev_err(dev, "Bad firmware file\n");
561                 status = -EINVAL;
562                 goto abort_with_fw;
563         }
564         hdr = (void *)(fw->data + hdr_offset);
565
566         status = myri10ge_validate_firmware(mgp, hdr);
567         if (status != 0)
568                 goto abort_with_fw;
569
570         crc = crc32(~0, fw->data, fw->size);
571         for (i = 0; i < fw->size; i += 256) {
572                 myri10ge_pio_copy(mgp->sram + MYRI10GE_FW_OFFSET + i,
573                                   fw->data + i,
574                                   min(256U, (unsigned)(fw->size - i)));
575                 mb();
576                 readb(mgp->sram);
577         }
578         /* corruption checking is good for parity recovery and buggy chipset */
579         memcpy_fromio(fw->data, mgp->sram + MYRI10GE_FW_OFFSET, fw->size);
580         reread_crc = crc32(~0, fw->data, fw->size);
581         if (crc != reread_crc) {
582                 dev_err(dev, "CRC failed(fw-len=%u), got 0x%x (expect 0x%x)\n",
583                         (unsigned)fw->size, reread_crc, crc);
584                 status = -EIO;
585                 goto abort_with_fw;
586         }
587         *size = (u32) fw->size;
588
589 abort_with_fw:
590         release_firmware(fw);
591
592 abort_with_nothing:
593         return status;
594 }
595
596 static int myri10ge_adopt_running_firmware(struct myri10ge_priv *mgp)
597 {
598         struct mcp_gen_header *hdr;
599         struct device *dev = &mgp->pdev->dev;
600         const size_t bytes = sizeof(struct mcp_gen_header);
601         size_t hdr_offset;
602         int status;
603
604         /* find running firmware header */
605         hdr_offset = swab32(readl(mgp->sram + MCP_HEADER_PTR_OFFSET));
606
607         if ((hdr_offset & 3) || hdr_offset + sizeof(*hdr) > mgp->sram_size) {
608                 dev_err(dev, "Running firmware has bad header offset (%d)\n",
609                         (int)hdr_offset);
610                 return -EIO;
611         }
612
613         /* copy header of running firmware from SRAM to host memory to
614          * validate firmware */
615         hdr = kmalloc(bytes, GFP_KERNEL);
616         if (hdr == NULL) {
617                 dev_err(dev, "could not malloc firmware hdr\n");
618                 return -ENOMEM;
619         }
620         memcpy_fromio(hdr, mgp->sram + hdr_offset, bytes);
621         status = myri10ge_validate_firmware(mgp, hdr);
622         kfree(hdr);
623
624         /* check to see if adopted firmware has bug where adopting
625          * it will cause broadcasts to be filtered unless the NIC
626          * is kept in ALLMULTI mode */
627         if (mgp->fw_ver_major == 1 && mgp->fw_ver_minor == 4 &&
628             mgp->fw_ver_tiny >= 4 && mgp->fw_ver_tiny <= 11) {
629                 mgp->adopted_rx_filter_bug = 1;
630                 dev_warn(dev, "Adopting fw %d.%d.%d: "
631                          "working around rx filter bug\n",
632                          mgp->fw_ver_major, mgp->fw_ver_minor,
633                          mgp->fw_ver_tiny);
634         }
635         return status;
636 }
637
638 int myri10ge_get_firmware_capabilities(struct myri10ge_priv *mgp)
639 {
640         struct myri10ge_cmd cmd;
641         int status;
642
643         /* probe for IPv6 TSO support */
644         mgp->features = NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_TSO;
645         status = myri10ge_send_cmd(mgp, MXGEFW_CMD_GET_MAX_TSO6_HDR_SIZE,
646                                    &cmd, 0);
647         if (status == 0) {
648                 mgp->max_tso6 = cmd.data0;
649                 mgp->features |= NETIF_F_TSO6;
650         }
651
652         status = myri10ge_send_cmd(mgp, MXGEFW_CMD_GET_RX_RING_SIZE, &cmd, 0);
653         if (status != 0) {
654                 dev_err(&mgp->pdev->dev,
655                         "failed MXGEFW_CMD_GET_RX_RING_SIZE\n");
656                 return -ENXIO;
657         }
658
659         mgp->max_intr_slots = 2 * (cmd.data0 / sizeof(struct mcp_dma_addr));
660
661         return 0;
662 }
663
664 static int myri10ge_load_firmware(struct myri10ge_priv *mgp)
665 {
666         char __iomem *submit;
667         __be32 buf[16] __attribute__ ((__aligned__(8)));
668         u32 dma_low, dma_high, size;
669         int status, i;
670
671         size = 0;
672         status = myri10ge_load_hotplug_firmware(mgp, &size);
673         if (status) {
674                 dev_warn(&mgp->pdev->dev, "hotplug firmware loading failed\n");
675
676                 /* Do not attempt to adopt firmware if there
677                  * was a bad crc */
678                 if (status == -EIO)
679                         return status;
680
681                 status = myri10ge_adopt_running_firmware(mgp);
682                 if (status != 0) {
683                         dev_err(&mgp->pdev->dev,
684                                 "failed to adopt running firmware\n");
685                         return status;
686                 }
687                 dev_info(&mgp->pdev->dev,
688                          "Successfully adopted running firmware\n");
689                 if (mgp->tx_boundary == 4096) {
690                         dev_warn(&mgp->pdev->dev,
691                                  "Using firmware currently running on NIC"
692                                  ".  For optimal\n");
693                         dev_warn(&mgp->pdev->dev,
694                                  "performance consider loading optimized "
695                                  "firmware\n");
696                         dev_warn(&mgp->pdev->dev, "via hotplug\n");
697                 }
698
699                 mgp->fw_name = "adopted";
700                 mgp->tx_boundary = 2048;
701                 myri10ge_dummy_rdma(mgp, 1);
702                 status = myri10ge_get_firmware_capabilities(mgp);
703                 return status;
704         }
705
706         /* clear confirmation addr */
707         mgp->cmd->data = 0;
708         mb();
709
710         /* send a reload command to the bootstrap MCP, and wait for the
711          *  response in the confirmation address.  The firmware should
712          * write a -1 there to indicate it is alive and well
713          */
714         dma_low = MYRI10GE_LOWPART_TO_U32(mgp->cmd_bus);
715         dma_high = MYRI10GE_HIGHPART_TO_U32(mgp->cmd_bus);
716
717         buf[0] = htonl(dma_high);       /* confirm addr MSW */
718         buf[1] = htonl(dma_low);        /* confirm addr LSW */
719         buf[2] = MYRI10GE_NO_CONFIRM_DATA;      /* confirm data */
720
721         /* FIX: All newest firmware should un-protect the bottom of
722          * the sram before handoff. However, the very first interfaces
723          * do not. Therefore the handoff copy must skip the first 8 bytes
724          */
725         buf[3] = htonl(MYRI10GE_FW_OFFSET + 8); /* where the code starts */
726         buf[4] = htonl(size - 8);       /* length of code */
727         buf[5] = htonl(8);      /* where to copy to */
728         buf[6] = htonl(0);      /* where to jump to */
729
730         submit = mgp->sram + MXGEFW_BOOT_HANDOFF;
731
732         myri10ge_pio_copy(submit, &buf, sizeof(buf));
733         mb();
734         msleep(1);
735         mb();
736         i = 0;
737         while (mgp->cmd->data != MYRI10GE_NO_CONFIRM_DATA && i < 9) {
738                 msleep(1 << i);
739                 i++;
740         }
741         if (mgp->cmd->data != MYRI10GE_NO_CONFIRM_DATA) {
742                 dev_err(&mgp->pdev->dev, "handoff failed\n");
743                 return -ENXIO;
744         }
745         myri10ge_dummy_rdma(mgp, 1);
746         status = myri10ge_get_firmware_capabilities(mgp);
747
748         return status;
749 }
750
751 static int myri10ge_update_mac_address(struct myri10ge_priv *mgp, u8 * addr)
752 {
753         struct myri10ge_cmd cmd;
754         int status;
755
756         cmd.data0 = ((addr[0] << 24) | (addr[1] << 16)
757                      | (addr[2] << 8) | addr[3]);
758
759         cmd.data1 = ((addr[4] << 8) | (addr[5]));
760
761         status = myri10ge_send_cmd(mgp, MXGEFW_SET_MAC_ADDRESS, &cmd, 0);
762         return status;
763 }
764
765 static int myri10ge_change_pause(struct myri10ge_priv *mgp, int pause)
766 {
767         struct myri10ge_cmd cmd;
768         int status, ctl;
769
770         ctl = pause ? MXGEFW_ENABLE_FLOW_CONTROL : MXGEFW_DISABLE_FLOW_CONTROL;
771         status = myri10ge_send_cmd(mgp, ctl, &cmd, 0);
772
773         if (status) {
774                 printk(KERN_ERR
775                        "myri10ge: %s: Failed to set flow control mode\n",
776                        mgp->dev->name);
777                 return status;
778         }
779         mgp->pause = pause;
780         return 0;
781 }
782
783 static void
784 myri10ge_change_promisc(struct myri10ge_priv *mgp, int promisc, int atomic)
785 {
786         struct myri10ge_cmd cmd;
787         int status, ctl;
788
789         ctl = promisc ? MXGEFW_ENABLE_PROMISC : MXGEFW_DISABLE_PROMISC;
790         status = myri10ge_send_cmd(mgp, ctl, &cmd, atomic);
791         if (status)
792                 printk(KERN_ERR "myri10ge: %s: Failed to set promisc mode\n",
793                        mgp->dev->name);
794 }
795
796 static int myri10ge_dma_test(struct myri10ge_priv *mgp, int test_type)
797 {
798         struct myri10ge_cmd cmd;
799         int status;
800         u32 len;
801         struct page *dmatest_page;
802         dma_addr_t dmatest_bus;
803         char *test = " ";
804
805         dmatest_page = alloc_page(GFP_KERNEL);
806         if (!dmatest_page)
807                 return -ENOMEM;
808         dmatest_bus = pci_map_page(mgp->pdev, dmatest_page, 0, PAGE_SIZE,
809                                    DMA_BIDIRECTIONAL);
810
811         /* Run a small DMA test.
812          * The magic multipliers to the length tell the firmware
813          * to do DMA read, write, or read+write tests.  The
814          * results are returned in cmd.data0.  The upper 16
815          * bits or the return is the number of transfers completed.
816          * The lower 16 bits is the time in 0.5us ticks that the
817          * transfers took to complete.
818          */
819
820         len = mgp->tx_boundary;
821
822         cmd.data0 = MYRI10GE_LOWPART_TO_U32(dmatest_bus);
823         cmd.data1 = MYRI10GE_HIGHPART_TO_U32(dmatest_bus);
824         cmd.data2 = len * 0x10000;
825         status = myri10ge_send_cmd(mgp, test_type, &cmd, 0);
826         if (status != 0) {
827                 test = "read";
828                 goto abort;
829         }
830         mgp->read_dma = ((cmd.data0 >> 16) * len * 2) / (cmd.data0 & 0xffff);
831         cmd.data0 = MYRI10GE_LOWPART_TO_U32(dmatest_bus);
832         cmd.data1 = MYRI10GE_HIGHPART_TO_U32(dmatest_bus);
833         cmd.data2 = len * 0x1;
834         status = myri10ge_send_cmd(mgp, test_type, &cmd, 0);
835         if (status != 0) {
836                 test = "write";
837                 goto abort;
838         }
839         mgp->write_dma = ((cmd.data0 >> 16) * len * 2) / (cmd.data0 & 0xffff);
840
841         cmd.data0 = MYRI10GE_LOWPART_TO_U32(dmatest_bus);
842         cmd.data1 = MYRI10GE_HIGHPART_TO_U32(dmatest_bus);
843         cmd.data2 = len * 0x10001;
844         status = myri10ge_send_cmd(mgp, test_type, &cmd, 0);
845         if (status != 0) {
846                 test = "read/write";
847                 goto abort;
848         }
849         mgp->read_write_dma = ((cmd.data0 >> 16) * len * 2 * 2) /
850             (cmd.data0 & 0xffff);
851
852 abort:
853         pci_unmap_page(mgp->pdev, dmatest_bus, PAGE_SIZE, DMA_BIDIRECTIONAL);
854         put_page(dmatest_page);
855
856         if (status != 0 && test_type != MXGEFW_CMD_UNALIGNED_TEST)
857                 dev_warn(&mgp->pdev->dev, "DMA %s benchmark failed: %d\n",
858                          test, status);
859
860         return status;
861 }
862
863 static int myri10ge_reset(struct myri10ge_priv *mgp)
864 {
865         struct myri10ge_cmd cmd;
866         int status;
867         size_t bytes;
868
869         /* try to send a reset command to the card to see if it
870          * is alive */
871         memset(&cmd, 0, sizeof(cmd));
872         status = myri10ge_send_cmd(mgp, MXGEFW_CMD_RESET, &cmd, 0);
873         if (status != 0) {
874                 dev_err(&mgp->pdev->dev, "failed reset\n");
875                 return -ENXIO;
876         }
877
878         (void)myri10ge_dma_test(mgp, MXGEFW_DMA_TEST);
879
880         /* Now exchange information about interrupts  */
881
882         bytes = myri10ge_max_intr_slots * sizeof(*mgp->ss.rx_done.entry);
883         memset(mgp->ss.rx_done.entry, 0, bytes);
884         cmd.data0 = (u32) bytes;
885         status = myri10ge_send_cmd(mgp, MXGEFW_CMD_SET_INTRQ_SIZE, &cmd, 0);
886         cmd.data0 = MYRI10GE_LOWPART_TO_U32(mgp->ss.rx_done.bus);
887         cmd.data1 = MYRI10GE_HIGHPART_TO_U32(mgp->ss.rx_done.bus);
888         status |= myri10ge_send_cmd(mgp, MXGEFW_CMD_SET_INTRQ_DMA, &cmd, 0);
889
890         status |=
891             myri10ge_send_cmd(mgp, MXGEFW_CMD_GET_IRQ_ACK_OFFSET, &cmd, 0);
892         mgp->ss.irq_claim = (__iomem __be32 *) (mgp->sram + cmd.data0);
893         status |= myri10ge_send_cmd(mgp, MXGEFW_CMD_GET_IRQ_DEASSERT_OFFSET,
894                                     &cmd, 0);
895         mgp->irq_deassert = (__iomem __be32 *) (mgp->sram + cmd.data0);
896
897         status |= myri10ge_send_cmd
898             (mgp, MXGEFW_CMD_GET_INTR_COAL_DELAY_OFFSET, &cmd, 0);
899         mgp->intr_coal_delay_ptr = (__iomem __be32 *) (mgp->sram + cmd.data0);
900         if (status != 0) {
901                 dev_err(&mgp->pdev->dev, "failed set interrupt parameters\n");
902                 return status;
903         }
904         put_be32(htonl(mgp->intr_coal_delay), mgp->intr_coal_delay_ptr);
905
906         memset(mgp->ss.rx_done.entry, 0, bytes);
907
908         /* reset mcp/driver shared state back to 0 */
909         mgp->ss.tx.req = 0;
910         mgp->ss.tx.done = 0;
911         mgp->ss.tx.pkt_start = 0;
912         mgp->ss.tx.pkt_done = 0;
913         mgp->ss.rx_big.cnt = 0;
914         mgp->ss.rx_small.cnt = 0;
915         mgp->ss.rx_done.idx = 0;
916         mgp->ss.rx_done.cnt = 0;
917         mgp->link_changes = 0;
918         status = myri10ge_update_mac_address(mgp, mgp->dev->dev_addr);
919         myri10ge_change_pause(mgp, mgp->pause);
920         myri10ge_set_multicast_list(mgp->dev);
921         return status;
922 }
923
924 static inline void
925 myri10ge_submit_8rx(struct mcp_kreq_ether_recv __iomem * dst,
926                     struct mcp_kreq_ether_recv *src)
927 {
928         __be32 low;
929
930         low = src->addr_low;
931         src->addr_low = htonl(DMA_32BIT_MASK);
932         myri10ge_pio_copy(dst, src, 4 * sizeof(*src));
933         mb();
934         myri10ge_pio_copy(dst + 4, src + 4, 4 * sizeof(*src));
935         mb();
936         src->addr_low = low;
937         put_be32(low, &dst->addr_low);
938         mb();
939 }
940
941 static inline void myri10ge_vlan_ip_csum(struct sk_buff *skb, __wsum hw_csum)
942 {
943         struct vlan_hdr *vh = (struct vlan_hdr *)(skb->data);
944
945         if ((skb->protocol == htons(ETH_P_8021Q)) &&
946             (vh->h_vlan_encapsulated_proto == htons(ETH_P_IP) ||
947              vh->h_vlan_encapsulated_proto == htons(ETH_P_IPV6))) {
948                 skb->csum = hw_csum;
949                 skb->ip_summed = CHECKSUM_COMPLETE;
950         }
951 }
952
953 static inline void
954 myri10ge_rx_skb_build(struct sk_buff *skb, u8 * va,
955                       struct skb_frag_struct *rx_frags, int len, int hlen)
956 {
957         struct skb_frag_struct *skb_frags;
958
959         skb->len = skb->data_len = len;
960         skb->truesize = len + sizeof(struct sk_buff);
961         /* attach the page(s) */
962
963         skb_frags = skb_shinfo(skb)->frags;
964         while (len > 0) {
965                 memcpy(skb_frags, rx_frags, sizeof(*skb_frags));
966                 len -= rx_frags->size;
967                 skb_frags++;
968                 rx_frags++;
969                 skb_shinfo(skb)->nr_frags++;
970         }
971
972         /* pskb_may_pull is not available in irq context, but
973          * skb_pull() (for ether_pad and eth_type_trans()) requires
974          * the beginning of the packet in skb_headlen(), move it
975          * manually */
976         skb_copy_to_linear_data(skb, va, hlen);
977         skb_shinfo(skb)->frags[0].page_offset += hlen;
978         skb_shinfo(skb)->frags[0].size -= hlen;
979         skb->data_len -= hlen;
980         skb->tail += hlen;
981         skb_pull(skb, MXGEFW_PAD);
982 }
983
984 static void
985 myri10ge_alloc_rx_pages(struct myri10ge_priv *mgp, struct myri10ge_rx_buf *rx,
986                         int bytes, int watchdog)
987 {
988         struct page *page;
989         int idx;
990
991         if (unlikely(rx->watchdog_needed && !watchdog))
992                 return;
993
994         /* try to refill entire ring */
995         while (rx->fill_cnt != (rx->cnt + rx->mask + 1)) {
996                 idx = rx->fill_cnt & rx->mask;
997                 if (rx->page_offset + bytes <= MYRI10GE_ALLOC_SIZE) {
998                         /* we can use part of previous page */
999                         get_page(rx->page);
1000                 } else {
1001                         /* we need a new page */
1002                         page =
1003                             alloc_pages(GFP_ATOMIC | __GFP_COMP,
1004                                         MYRI10GE_ALLOC_ORDER);
1005                         if (unlikely(page == NULL)) {
1006                                 if (rx->fill_cnt - rx->cnt < 16)
1007                                         rx->watchdog_needed = 1;
1008                                 return;
1009                         }
1010                         rx->page = page;
1011                         rx->page_offset = 0;
1012                         rx->bus = pci_map_page(mgp->pdev, page, 0,
1013                                                MYRI10GE_ALLOC_SIZE,
1014                                                PCI_DMA_FROMDEVICE);
1015                 }
1016                 rx->info[idx].page = rx->page;
1017                 rx->info[idx].page_offset = rx->page_offset;
1018                 /* note that this is the address of the start of the
1019                  * page */
1020                 pci_unmap_addr_set(&rx->info[idx], bus, rx->bus);
1021                 rx->shadow[idx].addr_low =
1022                     htonl(MYRI10GE_LOWPART_TO_U32(rx->bus) + rx->page_offset);
1023                 rx->shadow[idx].addr_high =
1024                     htonl(MYRI10GE_HIGHPART_TO_U32(rx->bus));
1025
1026                 /* start next packet on a cacheline boundary */
1027                 rx->page_offset += SKB_DATA_ALIGN(bytes);
1028
1029 #if MYRI10GE_ALLOC_SIZE > 4096
1030                 /* don't cross a 4KB boundary */
1031                 if ((rx->page_offset >> 12) !=
1032                     ((rx->page_offset + bytes - 1) >> 12))
1033                         rx->page_offset = (rx->page_offset + 4096) & ~4095;
1034 #endif
1035                 rx->fill_cnt++;
1036
1037                 /* copy 8 descriptors to the firmware at a time */
1038                 if ((idx & 7) == 7) {
1039                         if (rx->wc_fifo == NULL)
1040                                 myri10ge_submit_8rx(&rx->lanai[idx - 7],
1041                                                     &rx->shadow[idx - 7]);
1042                         else {
1043                                 mb();
1044                                 myri10ge_pio_copy(rx->wc_fifo,
1045                                                   &rx->shadow[idx - 7], 64);
1046                         }
1047                 }
1048         }
1049 }
1050
1051 static inline void
1052 myri10ge_unmap_rx_page(struct pci_dev *pdev,
1053                        struct myri10ge_rx_buffer_state *info, int bytes)
1054 {
1055         /* unmap the recvd page if we're the only or last user of it */
1056         if (bytes >= MYRI10GE_ALLOC_SIZE / 2 ||
1057             (info->page_offset + 2 * bytes) > MYRI10GE_ALLOC_SIZE) {
1058                 pci_unmap_page(pdev, (pci_unmap_addr(info, bus)
1059                                       & ~(MYRI10GE_ALLOC_SIZE - 1)),
1060                                MYRI10GE_ALLOC_SIZE, PCI_DMA_FROMDEVICE);
1061         }
1062 }
1063
1064 #define MYRI10GE_HLEN 64        /* The number of bytes to copy from a
1065                                  * page into an skb */
1066
1067 static inline int
1068 myri10ge_rx_done(struct myri10ge_slice_state *ss, struct myri10ge_rx_buf *rx,
1069                  int bytes, int len, __wsum csum)
1070 {
1071         struct myri10ge_priv *mgp = ss->mgp;
1072         struct sk_buff *skb;
1073         struct skb_frag_struct rx_frags[MYRI10GE_MAX_FRAGS_PER_FRAME];
1074         int i, idx, hlen, remainder;
1075         struct pci_dev *pdev = mgp->pdev;
1076         struct net_device *dev = mgp->dev;
1077         u8 *va;
1078
1079         len += MXGEFW_PAD;
1080         idx = rx->cnt & rx->mask;
1081         va = page_address(rx->info[idx].page) + rx->info[idx].page_offset;
1082         prefetch(va);
1083         /* Fill skb_frag_struct(s) with data from our receive */
1084         for (i = 0, remainder = len; remainder > 0; i++) {
1085                 myri10ge_unmap_rx_page(pdev, &rx->info[idx], bytes);
1086                 rx_frags[i].page = rx->info[idx].page;
1087                 rx_frags[i].page_offset = rx->info[idx].page_offset;
1088                 if (remainder < MYRI10GE_ALLOC_SIZE)
1089                         rx_frags[i].size = remainder;
1090                 else
1091                         rx_frags[i].size = MYRI10GE_ALLOC_SIZE;
1092                 rx->cnt++;
1093                 idx = rx->cnt & rx->mask;
1094                 remainder -= MYRI10GE_ALLOC_SIZE;
1095         }
1096
1097         if (mgp->csum_flag && myri10ge_lro) {
1098                 rx_frags[0].page_offset += MXGEFW_PAD;
1099                 rx_frags[0].size -= MXGEFW_PAD;
1100                 len -= MXGEFW_PAD;
1101                 lro_receive_frags(&ss->rx_done.lro_mgr, rx_frags,
1102                                   len, len,
1103                                   /* opaque, will come back in get_frag_header */
1104                                   (void *)(__force unsigned long)csum, csum);
1105                 return 1;
1106         }
1107
1108         hlen = MYRI10GE_HLEN > len ? len : MYRI10GE_HLEN;
1109
1110         /* allocate an skb to attach the page(s) to. This is done
1111          * after trying LRO, so as to avoid skb allocation overheads */
1112
1113         skb = netdev_alloc_skb(dev, MYRI10GE_HLEN + 16);
1114         if (unlikely(skb == NULL)) {
1115                 mgp->stats.rx_dropped++;
1116                 do {
1117                         i--;
1118                         put_page(rx_frags[i].page);
1119                 } while (i != 0);
1120                 return 0;
1121         }
1122
1123         /* Attach the pages to the skb, and trim off any padding */
1124         myri10ge_rx_skb_build(skb, va, rx_frags, len, hlen);
1125         if (skb_shinfo(skb)->frags[0].size <= 0) {
1126                 put_page(skb_shinfo(skb)->frags[0].page);
1127                 skb_shinfo(skb)->nr_frags = 0;
1128         }
1129         skb->protocol = eth_type_trans(skb, dev);
1130
1131         if (mgp->csum_flag) {
1132                 if ((skb->protocol == htons(ETH_P_IP)) ||
1133                     (skb->protocol == htons(ETH_P_IPV6))) {
1134                         skb->csum = csum;
1135                         skb->ip_summed = CHECKSUM_COMPLETE;
1136                 } else
1137                         myri10ge_vlan_ip_csum(skb, csum);
1138         }
1139         netif_receive_skb(skb);
1140         dev->last_rx = jiffies;
1141         return 1;
1142 }
1143
1144 static inline void
1145 myri10ge_tx_done(struct myri10ge_slice_state *ss, int mcp_index)
1146 {
1147         struct pci_dev *pdev = ss->mgp->pdev;
1148         struct myri10ge_tx_buf *tx = &ss->tx;
1149         struct sk_buff *skb;
1150         int idx, len;
1151
1152         while (tx->pkt_done != mcp_index) {
1153                 idx = tx->done & tx->mask;
1154                 skb = tx->info[idx].skb;
1155
1156                 /* Mark as free */
1157                 tx->info[idx].skb = NULL;
1158                 if (tx->info[idx].last) {
1159                         tx->pkt_done++;
1160                         tx->info[idx].last = 0;
1161                 }
1162                 tx->done++;
1163                 len = pci_unmap_len(&tx->info[idx], len);
1164                 pci_unmap_len_set(&tx->info[idx], len, 0);
1165                 if (skb) {
1166                         ss->stats.tx_bytes += skb->len;
1167                         ss->stats.tx_packets++;
1168                         dev_kfree_skb_irq(skb);
1169                         if (len)
1170                                 pci_unmap_single(pdev,
1171                                                  pci_unmap_addr(&tx->info[idx],
1172                                                                 bus), len,
1173                                                  PCI_DMA_TODEVICE);
1174                 } else {
1175                         if (len)
1176                                 pci_unmap_page(pdev,
1177                                                pci_unmap_addr(&tx->info[idx],
1178                                                               bus), len,
1179                                                PCI_DMA_TODEVICE);
1180                 }
1181         }
1182         /* start the queue if we've stopped it */
1183         if (netif_queue_stopped(ss->dev)
1184             && tx->req - tx->done < (tx->mask >> 1)) {
1185                 tx->wake_queue++;
1186                 netif_wake_queue(ss->dev);
1187         }
1188 }
1189
1190 static inline int
1191 myri10ge_clean_rx_done(struct myri10ge_slice_state *ss, int budget)
1192 {
1193         struct myri10ge_rx_done *rx_done = &ss->rx_done;
1194         struct myri10ge_priv *mgp = ss->mgp;
1195         unsigned long rx_bytes = 0;
1196         unsigned long rx_packets = 0;
1197         unsigned long rx_ok;
1198
1199         int idx = rx_done->idx;
1200         int cnt = rx_done->cnt;
1201         int work_done = 0;
1202         u16 length;
1203         __wsum checksum;
1204
1205         while (rx_done->entry[idx].length != 0 && work_done < budget) {
1206                 length = ntohs(rx_done->entry[idx].length);
1207                 rx_done->entry[idx].length = 0;
1208                 checksum = csum_unfold(rx_done->entry[idx].checksum);
1209                 if (length <= mgp->small_bytes)
1210                         rx_ok = myri10ge_rx_done(ss, &ss->rx_small,
1211                                                  mgp->small_bytes,
1212                                                  length, checksum);
1213                 else
1214                         rx_ok = myri10ge_rx_done(ss, &ss->rx_big,
1215                                                  mgp->big_bytes,
1216                                                  length, checksum);
1217                 rx_packets += rx_ok;
1218                 rx_bytes += rx_ok * (unsigned long)length;
1219                 cnt++;
1220                 idx = cnt & (myri10ge_max_intr_slots - 1);
1221                 work_done++;
1222         }
1223         rx_done->idx = idx;
1224         rx_done->cnt = cnt;
1225         ss->stats.rx_packets += rx_packets;
1226         ss->stats.rx_bytes += rx_bytes;
1227
1228         if (myri10ge_lro)
1229                 lro_flush_all(&rx_done->lro_mgr);
1230
1231         /* restock receive rings if needed */
1232         if (ss->rx_small.fill_cnt - ss->rx_small.cnt < myri10ge_fill_thresh)
1233                 myri10ge_alloc_rx_pages(mgp, &ss->rx_small,
1234                                         mgp->small_bytes + MXGEFW_PAD, 0);
1235         if (ss->rx_big.fill_cnt - ss->rx_big.cnt < myri10ge_fill_thresh)
1236                 myri10ge_alloc_rx_pages(mgp, &ss->rx_big, mgp->big_bytes, 0);
1237
1238         return work_done;
1239 }
1240
1241 static inline void myri10ge_check_statblock(struct myri10ge_priv *mgp)
1242 {
1243         struct mcp_irq_data *stats = mgp->ss.fw_stats;
1244
1245         if (unlikely(stats->stats_updated)) {
1246                 unsigned link_up = ntohl(stats->link_up);
1247                 if (mgp->link_state != link_up) {
1248                         mgp->link_state = link_up;
1249
1250                         if (mgp->link_state == MXGEFW_LINK_UP) {
1251                                 if (netif_msg_link(mgp))
1252                                         printk(KERN_INFO
1253                                                "myri10ge: %s: link up\n",
1254                                                mgp->dev->name);
1255                                 netif_carrier_on(mgp->dev);
1256                                 mgp->link_changes++;
1257                         } else {
1258                                 if (netif_msg_link(mgp))
1259                                         printk(KERN_INFO
1260                                                "myri10ge: %s: link %s\n",
1261                                                mgp->dev->name,
1262                                                (link_up == MXGEFW_LINK_MYRINET ?
1263                                                 "mismatch (Myrinet detected)" :
1264                                                 "down"));
1265                                 netif_carrier_off(mgp->dev);
1266                                 mgp->link_changes++;
1267                         }
1268                 }
1269                 if (mgp->rdma_tags_available !=
1270                     ntohl(stats->rdma_tags_available)) {
1271                         mgp->rdma_tags_available =
1272                             ntohl(stats->rdma_tags_available);
1273                         printk(KERN_WARNING "myri10ge: %s: RDMA timed out! "
1274                                "%d tags left\n", mgp->dev->name,
1275                                mgp->rdma_tags_available);
1276                 }
1277                 mgp->down_cnt += stats->link_down;
1278                 if (stats->link_down)
1279                         wake_up(&mgp->down_wq);
1280         }
1281 }
1282
1283 static int myri10ge_poll(struct napi_struct *napi, int budget)
1284 {
1285         struct myri10ge_slice_state *ss =
1286             container_of(napi, struct myri10ge_slice_state, napi);
1287         struct net_device *netdev = ss->mgp->dev;
1288         int work_done;
1289
1290         /* process as many rx events as NAPI will allow */
1291         work_done = myri10ge_clean_rx_done(ss, budget);
1292
1293         if (work_done < budget) {
1294                 netif_rx_complete(netdev, napi);
1295                 put_be32(htonl(3), ss->irq_claim);
1296         }
1297         return work_done;
1298 }
1299
1300 static irqreturn_t myri10ge_intr(int irq, void *arg)
1301 {
1302         struct myri10ge_slice_state *ss = arg;
1303         struct myri10ge_priv *mgp = ss->mgp;
1304         struct mcp_irq_data *stats = ss->fw_stats;
1305         struct myri10ge_tx_buf *tx = &ss->tx;
1306         u32 send_done_count;
1307         int i;
1308
1309         /* make sure it is our IRQ, and that the DMA has finished */
1310         if (unlikely(!stats->valid))
1311                 return (IRQ_NONE);
1312
1313         /* low bit indicates receives are present, so schedule
1314          * napi poll handler */
1315         if (stats->valid & 1)
1316                 netif_rx_schedule(ss->dev, &ss->napi);
1317
1318         if (!mgp->msi_enabled) {
1319                 put_be32(0, mgp->irq_deassert);
1320                 if (!myri10ge_deassert_wait)
1321                         stats->valid = 0;
1322                 mb();
1323         } else
1324                 stats->valid = 0;
1325
1326         /* Wait for IRQ line to go low, if using INTx */
1327         i = 0;
1328         while (1) {
1329                 i++;
1330                 /* check for transmit completes and receives */
1331                 send_done_count = ntohl(stats->send_done_count);
1332                 if (send_done_count != tx->pkt_done)
1333                         myri10ge_tx_done(ss, (int)send_done_count);
1334                 if (unlikely(i > myri10ge_max_irq_loops)) {
1335                         printk(KERN_WARNING "myri10ge: %s: irq stuck?\n",
1336                                mgp->dev->name);
1337                         stats->valid = 0;
1338                         schedule_work(&mgp->watchdog_work);
1339                 }
1340                 if (likely(stats->valid == 0))
1341                         break;
1342                 cpu_relax();
1343                 barrier();
1344         }
1345
1346         myri10ge_check_statblock(mgp);
1347
1348         put_be32(htonl(3), ss->irq_claim + 1);
1349         return (IRQ_HANDLED);
1350 }
1351
1352 static int
1353 myri10ge_get_settings(struct net_device *netdev, struct ethtool_cmd *cmd)
1354 {
1355         struct myri10ge_priv *mgp = netdev_priv(netdev);
1356         char *ptr;
1357         int i;
1358
1359         cmd->autoneg = AUTONEG_DISABLE;
1360         cmd->speed = SPEED_10000;
1361         cmd->duplex = DUPLEX_FULL;
1362
1363         /*
1364          * parse the product code to deterimine the interface type
1365          * (CX4, XFP, Quad Ribbon Fiber) by looking at the character
1366          * after the 3rd dash in the driver's cached copy of the
1367          * EEPROM's product code string.
1368          */
1369         ptr = mgp->product_code_string;
1370         if (ptr == NULL) {
1371                 printk(KERN_ERR "myri10ge: %s: Missing product code\n",
1372                        netdev->name);
1373                 return 0;
1374         }
1375         for (i = 0; i < 3; i++, ptr++) {
1376                 ptr = strchr(ptr, '-');
1377                 if (ptr == NULL) {
1378                         printk(KERN_ERR "myri10ge: %s: Invalid product "
1379                                "code %s\n", netdev->name,
1380                                mgp->product_code_string);
1381                         return 0;
1382                 }
1383         }
1384         if (*ptr == 'R' || *ptr == 'Q') {
1385                 /* We've found either an XFP or quad ribbon fiber */
1386                 cmd->port = PORT_FIBRE;
1387         }
1388         return 0;
1389 }
1390
1391 static void
1392 myri10ge_get_drvinfo(struct net_device *netdev, struct ethtool_drvinfo *info)
1393 {
1394         struct myri10ge_priv *mgp = netdev_priv(netdev);
1395
1396         strlcpy(info->driver, "myri10ge", sizeof(info->driver));
1397         strlcpy(info->version, MYRI10GE_VERSION_STR, sizeof(info->version));
1398         strlcpy(info->fw_version, mgp->fw_version, sizeof(info->fw_version));
1399         strlcpy(info->bus_info, pci_name(mgp->pdev), sizeof(info->bus_info));
1400 }
1401
1402 static int
1403 myri10ge_get_coalesce(struct net_device *netdev, struct ethtool_coalesce *coal)
1404 {
1405         struct myri10ge_priv *mgp = netdev_priv(netdev);
1406
1407         coal->rx_coalesce_usecs = mgp->intr_coal_delay;
1408         return 0;
1409 }
1410
1411 static int
1412 myri10ge_set_coalesce(struct net_device *netdev, struct ethtool_coalesce *coal)
1413 {
1414         struct myri10ge_priv *mgp = netdev_priv(netdev);
1415
1416         mgp->intr_coal_delay = coal->rx_coalesce_usecs;
1417         put_be32(htonl(mgp->intr_coal_delay), mgp->intr_coal_delay_ptr);
1418         return 0;
1419 }
1420
1421 static void
1422 myri10ge_get_pauseparam(struct net_device *netdev,
1423                         struct ethtool_pauseparam *pause)
1424 {
1425         struct myri10ge_priv *mgp = netdev_priv(netdev);
1426
1427         pause->autoneg = 0;
1428         pause->rx_pause = mgp->pause;
1429         pause->tx_pause = mgp->pause;
1430 }
1431
1432 static int
1433 myri10ge_set_pauseparam(struct net_device *netdev,
1434                         struct ethtool_pauseparam *pause)
1435 {
1436         struct myri10ge_priv *mgp = netdev_priv(netdev);
1437
1438         if (pause->tx_pause != mgp->pause)
1439                 return myri10ge_change_pause(mgp, pause->tx_pause);
1440         if (pause->rx_pause != mgp->pause)
1441                 return myri10ge_change_pause(mgp, pause->tx_pause);
1442         if (pause->autoneg != 0)
1443                 return -EINVAL;
1444         return 0;
1445 }
1446
1447 static void
1448 myri10ge_get_ringparam(struct net_device *netdev,
1449                        struct ethtool_ringparam *ring)
1450 {
1451         struct myri10ge_priv *mgp = netdev_priv(netdev);
1452
1453         ring->rx_mini_max_pending = mgp->ss.rx_small.mask + 1;
1454         ring->rx_max_pending = mgp->ss.rx_big.mask + 1;
1455         ring->rx_jumbo_max_pending = 0;
1456         ring->tx_max_pending = mgp->ss.rx_small.mask + 1;
1457         ring->rx_mini_pending = ring->rx_mini_max_pending;
1458         ring->rx_pending = ring->rx_max_pending;
1459         ring->rx_jumbo_pending = ring->rx_jumbo_max_pending;
1460         ring->tx_pending = ring->tx_max_pending;
1461 }
1462
1463 static u32 myri10ge_get_rx_csum(struct net_device *netdev)
1464 {
1465         struct myri10ge_priv *mgp = netdev_priv(netdev);
1466
1467         if (mgp->csum_flag)
1468                 return 1;
1469         else
1470                 return 0;
1471 }
1472
1473 static int myri10ge_set_rx_csum(struct net_device *netdev, u32 csum_enabled)
1474 {
1475         struct myri10ge_priv *mgp = netdev_priv(netdev);
1476
1477         if (csum_enabled)
1478                 mgp->csum_flag = MXGEFW_FLAGS_CKSUM;
1479         else
1480                 mgp->csum_flag = 0;
1481         return 0;
1482 }
1483
1484 static int myri10ge_set_tso(struct net_device *netdev, u32 tso_enabled)
1485 {
1486         struct myri10ge_priv *mgp = netdev_priv(netdev);
1487         unsigned long flags = mgp->features & (NETIF_F_TSO6 | NETIF_F_TSO);
1488
1489         if (tso_enabled)
1490                 netdev->features |= flags;
1491         else
1492                 netdev->features &= ~flags;
1493         return 0;
1494 }
1495
1496 static const char myri10ge_gstrings_main_stats[][ETH_GSTRING_LEN] = {
1497         "rx_packets", "tx_packets", "rx_bytes", "tx_bytes", "rx_errors",
1498         "tx_errors", "rx_dropped", "tx_dropped", "multicast", "collisions",
1499         "rx_length_errors", "rx_over_errors", "rx_crc_errors",
1500         "rx_frame_errors", "rx_fifo_errors", "rx_missed_errors",
1501         "tx_aborted_errors", "tx_carrier_errors", "tx_fifo_errors",
1502         "tx_heartbeat_errors", "tx_window_errors",
1503         /* device-specific stats */
1504         "tx_boundary", "WC", "irq", "MSI",
1505         "read_dma_bw_MBs", "write_dma_bw_MBs", "read_write_dma_bw_MBs",
1506         "serial_number", "watchdog_resets",
1507         "link_changes", "link_up", "dropped_link_overflow",
1508         "dropped_link_error_or_filtered",
1509         "dropped_pause", "dropped_bad_phy", "dropped_bad_crc32",
1510         "dropped_unicast_filtered", "dropped_multicast_filtered",
1511         "dropped_runt", "dropped_overrun", "dropped_no_small_buffer",
1512         "dropped_no_big_buffer"
1513 };
1514
1515 static const char myri10ge_gstrings_slice_stats[][ETH_GSTRING_LEN] = {
1516         "----------- slice ---------",
1517         "tx_pkt_start", "tx_pkt_done", "tx_req", "tx_done",
1518         "rx_small_cnt", "rx_big_cnt",
1519         "wake_queue", "stop_queue", "tx_linearized", "LRO aggregated",
1520             "LRO flushed",
1521         "LRO avg aggr", "LRO no_desc"
1522 };
1523
1524 #define MYRI10GE_NET_STATS_LEN      21
1525 #define MYRI10GE_MAIN_STATS_LEN  ARRAY_SIZE(myri10ge_gstrings_main_stats)
1526 #define MYRI10GE_SLICE_STATS_LEN  ARRAY_SIZE(myri10ge_gstrings_slice_stats)
1527
1528 static void
1529 myri10ge_get_strings(struct net_device *netdev, u32 stringset, u8 * data)
1530 {
1531         switch (stringset) {
1532         case ETH_SS_STATS:
1533                 memcpy(data, *myri10ge_gstrings_main_stats,
1534                        sizeof(myri10ge_gstrings_main_stats));
1535                 data += sizeof(myri10ge_gstrings_main_stats);
1536                 memcpy(data, *myri10ge_gstrings_slice_stats,
1537                        sizeof(myri10ge_gstrings_slice_stats));
1538                 data += sizeof(myri10ge_gstrings_slice_stats);
1539                 break;
1540         }
1541 }
1542
1543 static int myri10ge_get_sset_count(struct net_device *netdev, int sset)
1544 {
1545         switch (sset) {
1546         case ETH_SS_STATS:
1547                 return MYRI10GE_MAIN_STATS_LEN + MYRI10GE_SLICE_STATS_LEN;
1548         default:
1549                 return -EOPNOTSUPP;
1550         }
1551 }
1552
1553 static void
1554 myri10ge_get_ethtool_stats(struct net_device *netdev,
1555                            struct ethtool_stats *stats, u64 * data)
1556 {
1557         struct myri10ge_priv *mgp = netdev_priv(netdev);
1558         struct myri10ge_slice_state *ss;
1559         int i;
1560
1561         for (i = 0; i < MYRI10GE_NET_STATS_LEN; i++)
1562                 data[i] = ((unsigned long *)&mgp->stats)[i];
1563
1564         data[i++] = (unsigned int)mgp->tx_boundary;
1565         data[i++] = (unsigned int)mgp->wc_enabled;
1566         data[i++] = (unsigned int)mgp->pdev->irq;
1567         data[i++] = (unsigned int)mgp->msi_enabled;
1568         data[i++] = (unsigned int)mgp->read_dma;
1569         data[i++] = (unsigned int)mgp->write_dma;
1570         data[i++] = (unsigned int)mgp->read_write_dma;
1571         data[i++] = (unsigned int)mgp->serial_number;
1572         data[i++] = (unsigned int)mgp->watchdog_resets;
1573         data[i++] = (unsigned int)mgp->link_changes;
1574
1575         /* firmware stats are useful only in the first slice */
1576         ss = &mgp->ss;
1577         data[i++] = (unsigned int)ntohl(ss->fw_stats->link_up);
1578         data[i++] = (unsigned int)ntohl(ss->fw_stats->dropped_link_overflow);
1579         data[i++] =
1580             (unsigned int)ntohl(ss->fw_stats->dropped_link_error_or_filtered);
1581         data[i++] = (unsigned int)ntohl(ss->fw_stats->dropped_pause);
1582         data[i++] = (unsigned int)ntohl(ss->fw_stats->dropped_bad_phy);
1583         data[i++] = (unsigned int)ntohl(ss->fw_stats->dropped_bad_crc32);
1584         data[i++] = (unsigned int)ntohl(ss->fw_stats->dropped_unicast_filtered);
1585         data[i++] =
1586             (unsigned int)ntohl(ss->fw_stats->dropped_multicast_filtered);
1587         data[i++] = (unsigned int)ntohl(ss->fw_stats->dropped_runt);
1588         data[i++] = (unsigned int)ntohl(ss->fw_stats->dropped_overrun);
1589         data[i++] = (unsigned int)ntohl(ss->fw_stats->dropped_no_small_buffer);
1590         data[i++] = (unsigned int)ntohl(ss->fw_stats->dropped_no_big_buffer);
1591
1592         data[i++] = 0;
1593         data[i++] = (unsigned int)ss->tx.pkt_start;
1594         data[i++] = (unsigned int)ss->tx.pkt_done;
1595         data[i++] = (unsigned int)ss->tx.req;
1596         data[i++] = (unsigned int)ss->tx.done;
1597         data[i++] = (unsigned int)ss->rx_small.cnt;
1598         data[i++] = (unsigned int)ss->rx_big.cnt;
1599         data[i++] = (unsigned int)ss->tx.wake_queue;
1600         data[i++] = (unsigned int)ss->tx.stop_queue;
1601         data[i++] = (unsigned int)ss->tx.linearized;
1602         data[i++] = ss->rx_done.lro_mgr.stats.aggregated;
1603         data[i++] = ss->rx_done.lro_mgr.stats.flushed;
1604         if (ss->rx_done.lro_mgr.stats.flushed)
1605                 data[i++] = ss->rx_done.lro_mgr.stats.aggregated /
1606                     ss->rx_done.lro_mgr.stats.flushed;
1607         else
1608                 data[i++] = 0;
1609         data[i++] = ss->rx_done.lro_mgr.stats.no_desc;
1610 }
1611
1612 static void myri10ge_set_msglevel(struct net_device *netdev, u32 value)
1613 {
1614         struct myri10ge_priv *mgp = netdev_priv(netdev);
1615         mgp->msg_enable = value;
1616 }
1617
1618 static u32 myri10ge_get_msglevel(struct net_device *netdev)
1619 {
1620         struct myri10ge_priv *mgp = netdev_priv(netdev);
1621         return mgp->msg_enable;
1622 }
1623
1624 static const struct ethtool_ops myri10ge_ethtool_ops = {
1625         .get_settings = myri10ge_get_settings,
1626         .get_drvinfo = myri10ge_get_drvinfo,
1627         .get_coalesce = myri10ge_get_coalesce,
1628         .set_coalesce = myri10ge_set_coalesce,
1629         .get_pauseparam = myri10ge_get_pauseparam,
1630         .set_pauseparam = myri10ge_set_pauseparam,
1631         .get_ringparam = myri10ge_get_ringparam,
1632         .get_rx_csum = myri10ge_get_rx_csum,
1633         .set_rx_csum = myri10ge_set_rx_csum,
1634         .set_tx_csum = ethtool_op_set_tx_hw_csum,
1635         .set_sg = ethtool_op_set_sg,
1636         .set_tso = myri10ge_set_tso,
1637         .get_link = ethtool_op_get_link,
1638         .get_strings = myri10ge_get_strings,
1639         .get_sset_count = myri10ge_get_sset_count,
1640         .get_ethtool_stats = myri10ge_get_ethtool_stats,
1641         .set_msglevel = myri10ge_set_msglevel,
1642         .get_msglevel = myri10ge_get_msglevel
1643 };
1644
1645 static int myri10ge_allocate_rings(struct myri10ge_slice_state *ss)
1646 {
1647         struct myri10ge_priv *mgp = ss->mgp;
1648         struct myri10ge_cmd cmd;
1649         struct net_device *dev = mgp->dev;
1650         int tx_ring_size, rx_ring_size;
1651         int tx_ring_entries, rx_ring_entries;
1652         int i, status;
1653         size_t bytes;
1654
1655         /* get ring sizes */
1656         status = myri10ge_send_cmd(mgp, MXGEFW_CMD_GET_SEND_RING_SIZE, &cmd, 0);
1657         tx_ring_size = cmd.data0;
1658         status |= myri10ge_send_cmd(mgp, MXGEFW_CMD_GET_RX_RING_SIZE, &cmd, 0);
1659         if (status != 0)
1660                 return status;
1661         rx_ring_size = cmd.data0;
1662
1663         tx_ring_entries = tx_ring_size / sizeof(struct mcp_kreq_ether_send);
1664         rx_ring_entries = rx_ring_size / sizeof(struct mcp_dma_addr);
1665         ss->tx.mask = tx_ring_entries - 1;
1666         ss->rx_small.mask = ss->rx_big.mask = rx_ring_entries - 1;
1667
1668         status = -ENOMEM;
1669
1670         /* allocate the host shadow rings */
1671
1672         bytes = 8 + (MYRI10GE_MAX_SEND_DESC_TSO + 4)
1673             * sizeof(*ss->tx.req_list);
1674         ss->tx.req_bytes = kzalloc(bytes, GFP_KERNEL);
1675         if (ss->tx.req_bytes == NULL)
1676                 goto abort_with_nothing;
1677
1678         /* ensure req_list entries are aligned to 8 bytes */
1679         ss->tx.req_list = (struct mcp_kreq_ether_send *)
1680             ALIGN((unsigned long)ss->tx.req_bytes, 8);
1681
1682         bytes = rx_ring_entries * sizeof(*ss->rx_small.shadow);
1683         ss->rx_small.shadow = kzalloc(bytes, GFP_KERNEL);
1684         if (ss->rx_small.shadow == NULL)
1685                 goto abort_with_tx_req_bytes;
1686
1687         bytes = rx_ring_entries * sizeof(*ss->rx_big.shadow);
1688         ss->rx_big.shadow = kzalloc(bytes, GFP_KERNEL);
1689         if (ss->rx_big.shadow == NULL)
1690                 goto abort_with_rx_small_shadow;
1691
1692         /* allocate the host info rings */
1693
1694         bytes = tx_ring_entries * sizeof(*ss->tx.info);
1695         ss->tx.info = kzalloc(bytes, GFP_KERNEL);
1696         if (ss->tx.info == NULL)
1697                 goto abort_with_rx_big_shadow;
1698
1699         bytes = rx_ring_entries * sizeof(*ss->rx_small.info);
1700         ss->rx_small.info = kzalloc(bytes, GFP_KERNEL);
1701         if (ss->rx_small.info == NULL)
1702                 goto abort_with_tx_info;
1703
1704         bytes = rx_ring_entries * sizeof(*ss->rx_big.info);
1705         ss->rx_big.info = kzalloc(bytes, GFP_KERNEL);
1706         if (ss->rx_big.info == NULL)
1707                 goto abort_with_rx_small_info;
1708
1709         /* Fill the receive rings */
1710         ss->rx_big.cnt = 0;
1711         ss->rx_small.cnt = 0;
1712         ss->rx_big.fill_cnt = 0;
1713         ss->rx_small.fill_cnt = 0;
1714         ss->rx_small.page_offset = MYRI10GE_ALLOC_SIZE;
1715         ss->rx_big.page_offset = MYRI10GE_ALLOC_SIZE;
1716         ss->rx_small.watchdog_needed = 0;
1717         ss->rx_big.watchdog_needed = 0;
1718         myri10ge_alloc_rx_pages(mgp, &ss->rx_small,
1719                                 mgp->small_bytes + MXGEFW_PAD, 0);
1720
1721         if (ss->rx_small.fill_cnt < ss->rx_small.mask + 1) {
1722                 printk(KERN_ERR "myri10ge: %s: alloced only %d small bufs\n",
1723                        dev->name, ss->rx_small.fill_cnt);
1724                 goto abort_with_rx_small_ring;
1725         }
1726
1727         myri10ge_alloc_rx_pages(mgp, &ss->rx_big, mgp->big_bytes, 0);
1728         if (ss->rx_big.fill_cnt < ss->rx_big.mask + 1) {
1729                 printk(KERN_ERR "myri10ge: %s: alloced only %d big bufs\n",
1730                        dev->name, ss->rx_big.fill_cnt);
1731                 goto abort_with_rx_big_ring;
1732         }
1733
1734         return 0;
1735
1736 abort_with_rx_big_ring:
1737         for (i = ss->rx_big.cnt; i < ss->rx_big.fill_cnt; i++) {
1738                 int idx = i & ss->rx_big.mask;
1739                 myri10ge_unmap_rx_page(mgp->pdev, &ss->rx_big.info[idx],
1740                                        mgp->big_bytes);
1741                 put_page(ss->rx_big.info[idx].page);
1742         }
1743
1744 abort_with_rx_small_ring:
1745         for (i = ss->rx_small.cnt; i < ss->rx_small.fill_cnt; i++) {
1746                 int idx = i & ss->rx_small.mask;
1747                 myri10ge_unmap_rx_page(mgp->pdev, &ss->rx_small.info[idx],
1748                                        mgp->small_bytes + MXGEFW_PAD);
1749                 put_page(ss->rx_small.info[idx].page);
1750         }
1751
1752         kfree(ss->rx_big.info);
1753
1754 abort_with_rx_small_info:
1755         kfree(ss->rx_small.info);
1756
1757 abort_with_tx_info:
1758         kfree(ss->tx.info);
1759
1760 abort_with_rx_big_shadow:
1761         kfree(ss->rx_big.shadow);
1762
1763 abort_with_rx_small_shadow:
1764         kfree(ss->rx_small.shadow);
1765
1766 abort_with_tx_req_bytes:
1767         kfree(ss->tx.req_bytes);
1768         ss->tx.req_bytes = NULL;
1769         ss->tx.req_list = NULL;
1770
1771 abort_with_nothing:
1772         return status;
1773 }
1774
1775 static void myri10ge_free_rings(struct myri10ge_slice_state *ss)
1776 {
1777         struct myri10ge_priv *mgp = ss->mgp;
1778         struct sk_buff *skb;
1779         struct myri10ge_tx_buf *tx;
1780         int i, len, idx;
1781
1782         for (i = ss->rx_big.cnt; i < ss->rx_big.fill_cnt; i++) {
1783                 idx = i & ss->rx_big.mask;
1784                 if (i == ss->rx_big.fill_cnt - 1)
1785                         ss->rx_big.info[idx].page_offset = MYRI10GE_ALLOC_SIZE;
1786                 myri10ge_unmap_rx_page(mgp->pdev, &ss->rx_big.info[idx],
1787                                        mgp->big_bytes);
1788                 put_page(ss->rx_big.info[idx].page);
1789         }
1790
1791         for (i = ss->rx_small.cnt; i < ss->rx_small.fill_cnt; i++) {
1792                 idx = i & ss->rx_small.mask;
1793                 if (i == ss->rx_small.fill_cnt - 1)
1794                         ss->rx_small.info[idx].page_offset =
1795                             MYRI10GE_ALLOC_SIZE;
1796                 myri10ge_unmap_rx_page(mgp->pdev, &ss->rx_small.info[idx],
1797                                        mgp->small_bytes + MXGEFW_PAD);
1798                 put_page(ss->rx_small.info[idx].page);
1799         }
1800         tx = &ss->tx;
1801         while (tx->done != tx->req) {
1802                 idx = tx->done & tx->mask;
1803                 skb = tx->info[idx].skb;
1804
1805                 /* Mark as free */
1806                 tx->info[idx].skb = NULL;
1807                 tx->done++;
1808                 len = pci_unmap_len(&tx->info[idx], len);
1809                 pci_unmap_len_set(&tx->info[idx], len, 0);
1810                 if (skb) {
1811                         ss->stats.tx_dropped++;
1812                         dev_kfree_skb_any(skb);
1813                         if (len)
1814                                 pci_unmap_single(mgp->pdev,
1815                                                  pci_unmap_addr(&tx->info[idx],
1816                                                                 bus), len,
1817                                                  PCI_DMA_TODEVICE);
1818                 } else {
1819                         if (len)
1820                                 pci_unmap_page(mgp->pdev,
1821                                                pci_unmap_addr(&tx->info[idx],
1822                                                               bus), len,
1823                                                PCI_DMA_TODEVICE);
1824                 }
1825         }
1826         kfree(ss->rx_big.info);
1827
1828         kfree(ss->rx_small.info);
1829
1830         kfree(ss->tx.info);
1831
1832         kfree(ss->rx_big.shadow);
1833
1834         kfree(ss->rx_small.shadow);
1835
1836         kfree(ss->tx.req_bytes);
1837         ss->tx.req_bytes = NULL;
1838         ss->tx.req_list = NULL;
1839 }
1840
1841 static int myri10ge_request_irq(struct myri10ge_priv *mgp)
1842 {
1843         struct pci_dev *pdev = mgp->pdev;
1844         int status;
1845
1846         if (myri10ge_msi) {
1847                 status = pci_enable_msi(pdev);
1848                 if (status != 0)
1849                         dev_err(&pdev->dev,
1850                                 "Error %d setting up MSI; falling back to xPIC\n",
1851                                 status);
1852                 else
1853                         mgp->msi_enabled = 1;
1854         } else {
1855                 mgp->msi_enabled = 0;
1856         }
1857         status = request_irq(pdev->irq, myri10ge_intr, IRQF_SHARED,
1858                              mgp->dev->name, mgp);
1859         if (status != 0) {
1860                 dev_err(&pdev->dev, "failed to allocate IRQ\n");
1861                 if (mgp->msi_enabled)
1862                         pci_disable_msi(pdev);
1863         }
1864         return status;
1865 }
1866
1867 static void myri10ge_free_irq(struct myri10ge_priv *mgp)
1868 {
1869         struct pci_dev *pdev = mgp->pdev;
1870
1871         free_irq(pdev->irq, mgp);
1872         if (mgp->msi_enabled)
1873                 pci_disable_msi(pdev);
1874 }
1875
1876 static int
1877 myri10ge_get_frag_header(struct skb_frag_struct *frag, void **mac_hdr,
1878                          void **ip_hdr, void **tcpudp_hdr,
1879                          u64 * hdr_flags, void *priv)
1880 {
1881         struct ethhdr *eh;
1882         struct vlan_ethhdr *veh;
1883         struct iphdr *iph;
1884         u8 *va = page_address(frag->page) + frag->page_offset;
1885         unsigned long ll_hlen;
1886         /* passed opaque through lro_receive_frags() */
1887         __wsum csum = (__force __wsum) (unsigned long)priv;
1888
1889         /* find the mac header, aborting if not IPv4 */
1890
1891         eh = (struct ethhdr *)va;
1892         *mac_hdr = eh;
1893         ll_hlen = ETH_HLEN;
1894         if (eh->h_proto != htons(ETH_P_IP)) {
1895                 if (eh->h_proto == htons(ETH_P_8021Q)) {
1896                         veh = (struct vlan_ethhdr *)va;
1897                         if (veh->h_vlan_encapsulated_proto != htons(ETH_P_IP))
1898                                 return -1;
1899
1900                         ll_hlen += VLAN_HLEN;
1901
1902                         /*
1903                          *  HW checksum starts ETH_HLEN bytes into
1904                          *  frame, so we must subtract off the VLAN
1905                          *  header's checksum before csum can be used
1906                          */
1907                         csum = csum_sub(csum, csum_partial(va + ETH_HLEN,
1908                                                            VLAN_HLEN, 0));
1909                 } else {
1910                         return -1;
1911                 }
1912         }
1913         *hdr_flags = LRO_IPV4;
1914
1915         iph = (struct iphdr *)(va + ll_hlen);
1916         *ip_hdr = iph;
1917         if (iph->protocol != IPPROTO_TCP)
1918                 return -1;
1919         *hdr_flags |= LRO_TCP;
1920         *tcpudp_hdr = (u8 *) (*ip_hdr) + (iph->ihl << 2);
1921
1922         /* verify the IP checksum */
1923         if (unlikely(ip_fast_csum((u8 *) iph, iph->ihl)))
1924                 return -1;
1925
1926         /* verify the  checksum */
1927         if (unlikely(csum_tcpudp_magic(iph->saddr, iph->daddr,
1928                                        ntohs(iph->tot_len) - (iph->ihl << 2),
1929                                        IPPROTO_TCP, csum)))
1930                 return -1;
1931
1932         return 0;
1933 }
1934
1935 static int myri10ge_open(struct net_device *dev)
1936 {
1937         struct myri10ge_priv *mgp = netdev_priv(dev);
1938         struct myri10ge_cmd cmd;
1939         struct net_lro_mgr *lro_mgr;
1940         int status, big_pow2;
1941
1942         if (mgp->running != MYRI10GE_ETH_STOPPED)
1943                 return -EBUSY;
1944
1945         mgp->running = MYRI10GE_ETH_STARTING;
1946         status = myri10ge_reset(mgp);
1947         if (status != 0) {
1948                 printk(KERN_ERR "myri10ge: %s: failed reset\n", dev->name);
1949                 goto abort_with_nothing;
1950         }
1951
1952         status = myri10ge_request_irq(mgp);
1953         if (status != 0)
1954                 goto abort_with_nothing;
1955
1956         /* decide what small buffer size to use.  For good TCP rx
1957          * performance, it is important to not receive 1514 byte
1958          * frames into jumbo buffers, as it confuses the socket buffer
1959          * accounting code, leading to drops and erratic performance.
1960          */
1961
1962         if (dev->mtu <= ETH_DATA_LEN)
1963                 /* enough for a TCP header */
1964                 mgp->small_bytes = (128 > SMP_CACHE_BYTES)
1965                     ? (128 - MXGEFW_PAD)
1966                     : (SMP_CACHE_BYTES - MXGEFW_PAD);
1967         else
1968                 /* enough for a vlan encapsulated ETH_DATA_LEN frame */
1969                 mgp->small_bytes = VLAN_ETH_FRAME_LEN;
1970
1971         /* Override the small buffer size? */
1972         if (myri10ge_small_bytes > 0)
1973                 mgp->small_bytes = myri10ge_small_bytes;
1974
1975         /* get the lanai pointers to the send and receive rings */
1976
1977         status |= myri10ge_send_cmd(mgp, MXGEFW_CMD_GET_SEND_OFFSET, &cmd, 0);
1978         mgp->ss.tx.lanai =
1979             (struct mcp_kreq_ether_send __iomem *)(mgp->sram + cmd.data0);
1980
1981         status |=
1982             myri10ge_send_cmd(mgp, MXGEFW_CMD_GET_SMALL_RX_OFFSET, &cmd, 0);
1983         mgp->ss.rx_small.lanai =
1984             (struct mcp_kreq_ether_recv __iomem *)(mgp->sram + cmd.data0);
1985
1986         status |= myri10ge_send_cmd(mgp, MXGEFW_CMD_GET_BIG_RX_OFFSET, &cmd, 0);
1987         mgp->ss.rx_big.lanai =
1988             (struct mcp_kreq_ether_recv __iomem *)(mgp->sram + cmd.data0);
1989
1990         if (status != 0) {
1991                 printk(KERN_ERR
1992                        "myri10ge: %s: failed to get ring sizes or locations\n",
1993                        dev->name);
1994                 mgp->running = MYRI10GE_ETH_STOPPED;
1995                 goto abort_with_irq;
1996         }
1997
1998         if (myri10ge_wcfifo && mgp->wc_enabled) {
1999                 mgp->ss.tx.wc_fifo = (u8 __iomem *) mgp->sram + MXGEFW_ETH_SEND_4;
2000                 mgp->ss.rx_small.wc_fifo =
2001                     (u8 __iomem *) mgp->sram + MXGEFW_ETH_RECV_SMALL;
2002                 mgp->ss.rx_big.wc_fifo =
2003                     (u8 __iomem *) mgp->sram + MXGEFW_ETH_RECV_BIG;
2004         } else {
2005                 mgp->ss.tx.wc_fifo = NULL;
2006                 mgp->ss.rx_small.wc_fifo = NULL;
2007                 mgp->ss.rx_big.wc_fifo = NULL;
2008         }
2009
2010         /* Firmware needs the big buff size as a power of 2.  Lie and
2011          * tell him the buffer is larger, because we only use 1
2012          * buffer/pkt, and the mtu will prevent overruns.
2013          */
2014         big_pow2 = dev->mtu + ETH_HLEN + VLAN_HLEN + MXGEFW_PAD;
2015         if (big_pow2 < MYRI10GE_ALLOC_SIZE / 2) {
2016                 while (!is_power_of_2(big_pow2))
2017                         big_pow2++;
2018                 mgp->big_bytes = dev->mtu + ETH_HLEN + VLAN_HLEN + MXGEFW_PAD;
2019         } else {
2020                 big_pow2 = MYRI10GE_ALLOC_SIZE;
2021                 mgp->big_bytes = big_pow2;
2022         }
2023
2024         status = myri10ge_allocate_rings(&mgp->ss);
2025         if (status != 0)
2026                 goto abort_with_irq;
2027
2028         /* now give firmware buffers sizes, and MTU */
2029         cmd.data0 = dev->mtu + ETH_HLEN + VLAN_HLEN;
2030         status = myri10ge_send_cmd(mgp, MXGEFW_CMD_SET_MTU, &cmd, 0);
2031         cmd.data0 = mgp->small_bytes;
2032         status |=
2033             myri10ge_send_cmd(mgp, MXGEFW_CMD_SET_SMALL_BUFFER_SIZE, &cmd, 0);
2034         cmd.data0 = big_pow2;
2035         status |=
2036             myri10ge_send_cmd(mgp, MXGEFW_CMD_SET_BIG_BUFFER_SIZE, &cmd, 0);
2037         if (status) {
2038                 printk(KERN_ERR "myri10ge: %s: Couldn't set buffer sizes\n",
2039                        dev->name);
2040                 goto abort_with_rings;
2041         }
2042
2043         cmd.data0 = MYRI10GE_LOWPART_TO_U32(mgp->ss.fw_stats_bus);
2044         cmd.data1 = MYRI10GE_HIGHPART_TO_U32(mgp->ss.fw_stats_bus);
2045         cmd.data2 = sizeof(struct mcp_irq_data);
2046         status = myri10ge_send_cmd(mgp, MXGEFW_CMD_SET_STATS_DMA_V2, &cmd, 0);
2047         if (status == -ENOSYS) {
2048                 dma_addr_t bus = mgp->ss.fw_stats_bus;
2049                 bus += offsetof(struct mcp_irq_data, send_done_count);
2050                 cmd.data0 = MYRI10GE_LOWPART_TO_U32(bus);
2051                 cmd.data1 = MYRI10GE_HIGHPART_TO_U32(bus);
2052                 status = myri10ge_send_cmd(mgp,
2053                                            MXGEFW_CMD_SET_STATS_DMA_OBSOLETE,
2054                                            &cmd, 0);
2055                 /* Firmware cannot support multicast without STATS_DMA_V2 */
2056                 mgp->fw_multicast_support = 0;
2057         } else {
2058                 mgp->fw_multicast_support = 1;
2059         }
2060         if (status) {
2061                 printk(KERN_ERR "myri10ge: %s: Couldn't set stats DMA\n",
2062                        dev->name);
2063                 goto abort_with_rings;
2064         }
2065
2066         mgp->link_state = ~0U;
2067         mgp->rdma_tags_available = 15;
2068
2069         lro_mgr = &mgp->ss.rx_done.lro_mgr;
2070         lro_mgr->dev = dev;
2071         lro_mgr->features = LRO_F_NAPI;
2072         lro_mgr->ip_summed = CHECKSUM_COMPLETE;
2073         lro_mgr->ip_summed_aggr = CHECKSUM_UNNECESSARY;
2074         lro_mgr->max_desc = MYRI10GE_MAX_LRO_DESCRIPTORS;
2075         lro_mgr->lro_arr = mgp->ss.rx_done.lro_desc;
2076         lro_mgr->get_frag_header = myri10ge_get_frag_header;
2077         lro_mgr->max_aggr = myri10ge_lro_max_pkts;
2078         lro_mgr->frag_align_pad = 2;
2079         if (lro_mgr->max_aggr > MAX_SKB_FRAGS)
2080                 lro_mgr->max_aggr = MAX_SKB_FRAGS;
2081
2082         napi_enable(&mgp->ss.napi);     /* must happen prior to any irq */
2083
2084         status = myri10ge_send_cmd(mgp, MXGEFW_CMD_ETHERNET_UP, &cmd, 0);
2085         if (status) {
2086                 printk(KERN_ERR "myri10ge: %s: Couldn't bring up link\n",
2087                        dev->name);
2088                 goto abort_with_rings;
2089         }
2090
2091         mgp->ss.tx.wake_queue = 0;
2092         mgp->ss.tx.stop_queue = 0;
2093         mgp->running = MYRI10GE_ETH_RUNNING;
2094         mgp->watchdog_timer.expires = jiffies + myri10ge_watchdog_timeout * HZ;
2095         add_timer(&mgp->watchdog_timer);
2096         netif_wake_queue(dev);
2097         return 0;
2098
2099 abort_with_rings:
2100         myri10ge_free_rings(&mgp->ss);
2101
2102 abort_with_irq:
2103         myri10ge_free_irq(mgp);
2104
2105 abort_with_nothing:
2106         mgp->running = MYRI10GE_ETH_STOPPED;
2107         return -ENOMEM;
2108 }
2109
2110 static int myri10ge_close(struct net_device *dev)
2111 {
2112         struct myri10ge_priv *mgp = netdev_priv(dev);
2113         struct myri10ge_cmd cmd;
2114         int status, old_down_cnt;
2115
2116         if (mgp->running != MYRI10GE_ETH_RUNNING)
2117                 return 0;
2118
2119         if (mgp->ss.tx.req_bytes == NULL)
2120                 return 0;
2121
2122         del_timer_sync(&mgp->watchdog_timer);
2123         mgp->running = MYRI10GE_ETH_STOPPING;
2124         napi_disable(&mgp->ss.napi);
2125         netif_carrier_off(dev);
2126         netif_stop_queue(dev);
2127         old_down_cnt = mgp->down_cnt;
2128         mb();
2129         status = myri10ge_send_cmd(mgp, MXGEFW_CMD_ETHERNET_DOWN, &cmd, 0);
2130         if (status)
2131                 printk(KERN_ERR "myri10ge: %s: Couldn't bring down link\n",
2132                        dev->name);
2133
2134         wait_event_timeout(mgp->down_wq, old_down_cnt != mgp->down_cnt, HZ);
2135         if (old_down_cnt == mgp->down_cnt)
2136                 printk(KERN_ERR "myri10ge: %s never got down irq\n", dev->name);
2137
2138         netif_tx_disable(dev);
2139         myri10ge_free_irq(mgp);
2140         myri10ge_free_rings(&mgp->ss);
2141
2142         mgp->running = MYRI10GE_ETH_STOPPED;
2143         return 0;
2144 }
2145
2146 /* copy an array of struct mcp_kreq_ether_send's to the mcp.  Copy
2147  * backwards one at a time and handle ring wraps */
2148
2149 static inline void
2150 myri10ge_submit_req_backwards(struct myri10ge_tx_buf *tx,
2151                               struct mcp_kreq_ether_send *src, int cnt)
2152 {
2153         int idx, starting_slot;
2154         starting_slot = tx->req;
2155         while (cnt > 1) {
2156                 cnt--;
2157                 idx = (starting_slot + cnt) & tx->mask;
2158                 myri10ge_pio_copy(&tx->lanai[idx], &src[cnt], sizeof(*src));
2159                 mb();
2160         }
2161 }
2162
2163 /*
2164  * copy an array of struct mcp_kreq_ether_send's to the mcp.  Copy
2165  * at most 32 bytes at a time, so as to avoid involving the software
2166  * pio handler in the nic.   We re-write the first segment's flags
2167  * to mark them valid only after writing the entire chain.
2168  */
2169
2170 static inline void
2171 myri10ge_submit_req(struct myri10ge_tx_buf *tx, struct mcp_kreq_ether_send *src,
2172                     int cnt)
2173 {
2174         int idx, i;
2175         struct mcp_kreq_ether_send __iomem *dstp, *dst;
2176         struct mcp_kreq_ether_send *srcp;
2177         u8 last_flags;
2178
2179         idx = tx->req & tx->mask;
2180
2181         last_flags = src->flags;
2182         src->flags = 0;
2183         mb();
2184         dst = dstp = &tx->lanai[idx];
2185         srcp = src;
2186
2187         if ((idx + cnt) < tx->mask) {
2188                 for (i = 0; i < (cnt - 1); i += 2) {
2189                         myri10ge_pio_copy(dstp, srcp, 2 * sizeof(*src));
2190                         mb();   /* force write every 32 bytes */
2191                         srcp += 2;
2192                         dstp += 2;
2193                 }
2194         } else {
2195                 /* submit all but the first request, and ensure
2196                  * that it is submitted below */
2197                 myri10ge_submit_req_backwards(tx, src, cnt);
2198                 i = 0;
2199         }
2200         if (i < cnt) {
2201                 /* submit the first request */
2202                 myri10ge_pio_copy(dstp, srcp, sizeof(*src));
2203                 mb();           /* barrier before setting valid flag */
2204         }
2205
2206         /* re-write the last 32-bits with the valid flags */
2207         src->flags = last_flags;
2208         put_be32(*((__be32 *) src + 3), (__be32 __iomem *) dst + 3);
2209         tx->req += cnt;
2210         mb();
2211 }
2212
2213 static inline void
2214 myri10ge_submit_req_wc(struct myri10ge_tx_buf *tx,
2215                        struct mcp_kreq_ether_send *src, int cnt)
2216 {
2217         tx->req += cnt;
2218         mb();
2219         while (cnt >= 4) {
2220                 myri10ge_pio_copy(tx->wc_fifo, src, 64);
2221                 mb();
2222                 src += 4;
2223                 cnt -= 4;
2224         }
2225         if (cnt > 0) {
2226                 /* pad it to 64 bytes.  The src is 64 bytes bigger than it
2227                  * needs to be so that we don't overrun it */
2228                 myri10ge_pio_copy(tx->wc_fifo + MXGEFW_ETH_SEND_OFFSET(cnt),
2229                                   src, 64);
2230                 mb();
2231         }
2232 }
2233
2234 /*
2235  * Transmit a packet.  We need to split the packet so that a single
2236  * segment does not cross myri10ge->tx_boundary, so this makes segment
2237  * counting tricky.  So rather than try to count segments up front, we
2238  * just give up if there are too few segments to hold a reasonably
2239  * fragmented packet currently available.  If we run
2240  * out of segments while preparing a packet for DMA, we just linearize
2241  * it and try again.
2242  */
2243
2244 static int myri10ge_xmit(struct sk_buff *skb, struct net_device *dev)
2245 {
2246         struct myri10ge_priv *mgp = netdev_priv(dev);
2247         struct myri10ge_slice_state *ss;
2248         struct mcp_kreq_ether_send *req;
2249         struct myri10ge_tx_buf *tx;
2250         struct skb_frag_struct *frag;
2251         dma_addr_t bus;
2252         u32 low;
2253         __be32 high_swapped;
2254         unsigned int len;
2255         int idx, last_idx, avail, frag_cnt, frag_idx, count, mss, max_segments;
2256         u16 pseudo_hdr_offset, cksum_offset;
2257         int cum_len, seglen, boundary, rdma_count;
2258         u8 flags, odd_flag;
2259
2260         /* always transmit through slot 0 */
2261         ss = &mgp->ss;
2262         tx = &ss->tx;
2263 again:
2264         req = tx->req_list;
2265         avail = tx->mask - 1 - (tx->req - tx->done);
2266
2267         mss = 0;
2268         max_segments = MXGEFW_MAX_SEND_DESC;
2269
2270         if (skb_is_gso(skb)) {
2271                 mss = skb_shinfo(skb)->gso_size;
2272                 max_segments = MYRI10GE_MAX_SEND_DESC_TSO;
2273         }
2274
2275         if ((unlikely(avail < max_segments))) {
2276                 /* we are out of transmit resources */
2277                 tx->stop_queue++;
2278                 netif_stop_queue(dev);
2279                 return 1;
2280         }
2281
2282         /* Setup checksum offloading, if needed */
2283         cksum_offset = 0;
2284         pseudo_hdr_offset = 0;
2285         odd_flag = 0;
2286         flags = (MXGEFW_FLAGS_NO_TSO | MXGEFW_FLAGS_FIRST);
2287         if (likely(skb->ip_summed == CHECKSUM_PARTIAL)) {
2288                 cksum_offset = skb_transport_offset(skb);
2289                 pseudo_hdr_offset = cksum_offset + skb->csum_offset;
2290                 /* If the headers are excessively large, then we must
2291                  * fall back to a software checksum */
2292                 if (unlikely(!mss && (cksum_offset > 255 ||
2293                                       pseudo_hdr_offset > 127))) {
2294                         if (skb_checksum_help(skb))
2295                                 goto drop;
2296                         cksum_offset = 0;
2297                         pseudo_hdr_offset = 0;
2298                 } else {
2299                         odd_flag = MXGEFW_FLAGS_ALIGN_ODD;
2300                         flags |= MXGEFW_FLAGS_CKSUM;
2301                 }
2302         }
2303
2304         cum_len = 0;
2305
2306         if (mss) {              /* TSO */
2307                 /* this removes any CKSUM flag from before */
2308                 flags = (MXGEFW_FLAGS_TSO_HDR | MXGEFW_FLAGS_FIRST);
2309
2310                 /* negative cum_len signifies to the
2311                  * send loop that we are still in the
2312                  * header portion of the TSO packet.
2313                  * TSO header can be at most 1KB long */
2314                 cum_len = -(skb_transport_offset(skb) + tcp_hdrlen(skb));
2315
2316                 /* for IPv6 TSO, the checksum offset stores the
2317                  * TCP header length, to save the firmware from
2318                  * the need to parse the headers */
2319                 if (skb_is_gso_v6(skb)) {
2320                         cksum_offset = tcp_hdrlen(skb);
2321                         /* Can only handle headers <= max_tso6 long */
2322                         if (unlikely(-cum_len > mgp->max_tso6))
2323                                 return myri10ge_sw_tso(skb, dev);
2324                 }
2325                 /* for TSO, pseudo_hdr_offset holds mss.
2326                  * The firmware figures out where to put
2327                  * the checksum by parsing the header. */
2328                 pseudo_hdr_offset = mss;
2329         } else
2330                 /* Mark small packets, and pad out tiny packets */
2331         if (skb->len <= MXGEFW_SEND_SMALL_SIZE) {
2332                 flags |= MXGEFW_FLAGS_SMALL;
2333
2334                 /* pad frames to at least ETH_ZLEN bytes */
2335                 if (unlikely(skb->len < ETH_ZLEN)) {
2336                         if (skb_padto(skb, ETH_ZLEN)) {
2337                                 /* The packet is gone, so we must
2338                                  * return 0 */
2339                                 ss->stats.tx_dropped += 1;
2340                                 return 0;
2341                         }
2342                         /* adjust the len to account for the zero pad
2343                          * so that the nic can know how long it is */
2344                         skb->len = ETH_ZLEN;
2345                 }
2346         }
2347
2348         /* map the skb for DMA */
2349         len = skb->len - skb->data_len;
2350         idx = tx->req & tx->mask;
2351         tx->info[idx].skb = skb;
2352         bus = pci_map_single(mgp->pdev, skb->data, len, PCI_DMA_TODEVICE);
2353         pci_unmap_addr_set(&tx->info[idx], bus, bus);
2354         pci_unmap_len_set(&tx->info[idx], len, len);
2355
2356         frag_cnt = skb_shinfo(skb)->nr_frags;
2357         frag_idx = 0;
2358         count = 0;
2359         rdma_count = 0;
2360
2361         /* "rdma_count" is the number of RDMAs belonging to the
2362          * current packet BEFORE the current send request. For
2363          * non-TSO packets, this is equal to "count".
2364          * For TSO packets, rdma_count needs to be reset
2365          * to 0 after a segment cut.
2366          *
2367          * The rdma_count field of the send request is
2368          * the number of RDMAs of the packet starting at
2369          * that request. For TSO send requests with one ore more cuts
2370          * in the middle, this is the number of RDMAs starting
2371          * after the last cut in the request. All previous
2372          * segments before the last cut implicitly have 1 RDMA.
2373          *
2374          * Since the number of RDMAs is not known beforehand,
2375          * it must be filled-in retroactively - after each
2376          * segmentation cut or at the end of the entire packet.
2377          */
2378
2379         while (1) {
2380                 /* Break the SKB or Fragment up into pieces which
2381                  * do not cross mgp->tx_boundary */
2382                 low = MYRI10GE_LOWPART_TO_U32(bus);
2383                 high_swapped = htonl(MYRI10GE_HIGHPART_TO_U32(bus));
2384                 while (len) {
2385                         u8 flags_next;
2386                         int cum_len_next;
2387
2388                         if (unlikely(count == max_segments))
2389                                 goto abort_linearize;
2390
2391                         boundary =
2392                             (low + mgp->tx_boundary) & ~(mgp->tx_boundary - 1);
2393                         seglen = boundary - low;
2394                         if (seglen > len)
2395                                 seglen = len;
2396                         flags_next = flags & ~MXGEFW_FLAGS_FIRST;
2397                         cum_len_next = cum_len + seglen;
2398                         if (mss) {      /* TSO */
2399                                 (req - rdma_count)->rdma_count = rdma_count + 1;
2400
2401                                 if (likely(cum_len >= 0)) {     /* payload */
2402                                         int next_is_first, chop;
2403
2404                                         chop = (cum_len_next > mss);
2405                                         cum_len_next = cum_len_next % mss;
2406                                         next_is_first = (cum_len_next == 0);
2407                                         flags |= chop * MXGEFW_FLAGS_TSO_CHOP;
2408                                         flags_next |= next_is_first *
2409                                             MXGEFW_FLAGS_FIRST;
2410                                         rdma_count |= -(chop | next_is_first);
2411                                         rdma_count += chop & !next_is_first;
2412                                 } else if (likely(cum_len_next >= 0)) { /* header ends */
2413                                         int small;
2414
2415                                         rdma_count = -1;
2416                                         cum_len_next = 0;
2417                                         seglen = -cum_len;
2418                                         small = (mss <= MXGEFW_SEND_SMALL_SIZE);
2419                                         flags_next = MXGEFW_FLAGS_TSO_PLD |
2420                                             MXGEFW_FLAGS_FIRST |
2421                                             (small * MXGEFW_FLAGS_SMALL);
2422                                 }
2423                         }
2424                         req->addr_high = high_swapped;
2425                         req->addr_low = htonl(low);
2426                         req->pseudo_hdr_offset = htons(pseudo_hdr_offset);
2427                         req->pad = 0;   /* complete solid 16-byte block; does this matter? */
2428                         req->rdma_count = 1;
2429                         req->length = htons(seglen);
2430                         req->cksum_offset = cksum_offset;
2431                         req->flags = flags | ((cum_len & 1) * odd_flag);
2432
2433                         low += seglen;
2434                         len -= seglen;
2435                         cum_len = cum_len_next;
2436                         flags = flags_next;
2437                         req++;
2438                         count++;
2439                         rdma_count++;
2440                         if (cksum_offset != 0 && !(mss && skb_is_gso_v6(skb))) {
2441                                 if (unlikely(cksum_offset > seglen))
2442                                         cksum_offset -= seglen;
2443                                 else
2444                                         cksum_offset = 0;
2445                         }
2446                 }
2447                 if (frag_idx == frag_cnt)
2448                         break;
2449
2450                 /* map next fragment for DMA */
2451                 idx = (count + tx->req) & tx->mask;
2452                 frag = &skb_shinfo(skb)->frags[frag_idx];
2453                 frag_idx++;
2454                 len = frag->size;
2455                 bus = pci_map_page(mgp->pdev, frag->page, frag->page_offset,
2456                                    len, PCI_DMA_TODEVICE);
2457                 pci_unmap_addr_set(&tx->info[idx], bus, bus);
2458                 pci_unmap_len_set(&tx->info[idx], len, len);
2459         }
2460
2461         (req - rdma_count)->rdma_count = rdma_count;
2462         if (mss)
2463                 do {
2464                         req--;
2465                         req->flags |= MXGEFW_FLAGS_TSO_LAST;
2466                 } while (!(req->flags & (MXGEFW_FLAGS_TSO_CHOP |
2467                                          MXGEFW_FLAGS_FIRST)));
2468         idx = ((count - 1) + tx->req) & tx->mask;
2469         tx->info[idx].last = 1;
2470         if (tx->wc_fifo == NULL)
2471                 myri10ge_submit_req(tx, tx->req_list, count);
2472         else
2473                 myri10ge_submit_req_wc(tx, tx->req_list, count);
2474         tx->pkt_start++;
2475         if ((avail - count) < MXGEFW_MAX_SEND_DESC) {
2476                 tx->stop_queue++;
2477                 netif_stop_queue(dev);
2478         }
2479         dev->trans_start = jiffies;
2480         return 0;
2481
2482 abort_linearize:
2483         /* Free any DMA resources we've alloced and clear out the skb
2484          * slot so as to not trip up assertions, and to avoid a
2485          * double-free if linearizing fails */
2486
2487         last_idx = (idx + 1) & tx->mask;
2488         idx = tx->req & tx->mask;
2489         tx->info[idx].skb = NULL;
2490         do {
2491                 len = pci_unmap_len(&tx->info[idx], len);
2492                 if (len) {
2493                         if (tx->info[idx].skb != NULL)
2494                                 pci_unmap_single(mgp->pdev,
2495                                                  pci_unmap_addr(&tx->info[idx],
2496                                                                 bus), len,
2497                                                  PCI_DMA_TODEVICE);
2498                         else
2499                                 pci_unmap_page(mgp->pdev,
2500                                                pci_unmap_addr(&tx->info[idx],
2501                                                               bus), len,
2502                                                PCI_DMA_TODEVICE);
2503                         pci_unmap_len_set(&tx->info[idx], len, 0);
2504                         tx->info[idx].skb = NULL;
2505                 }
2506                 idx = (idx + 1) & tx->mask;
2507         } while (idx != last_idx);
2508         if (skb_is_gso(skb)) {
2509                 printk(KERN_ERR
2510                        "myri10ge: %s: TSO but wanted to linearize?!?!?\n",
2511                        mgp->dev->name);
2512                 goto drop;
2513         }
2514
2515         if (skb_linearize(skb))
2516                 goto drop;
2517
2518         tx->linearized++;
2519         goto again;
2520
2521 drop:
2522         dev_kfree_skb_any(skb);
2523         ss->stats.tx_dropped += 1;
2524         return 0;
2525
2526 }
2527
2528 static int myri10ge_sw_tso(struct sk_buff *skb, struct net_device *dev)
2529 {
2530         struct sk_buff *segs, *curr;
2531         struct myri10ge_priv *mgp = netdev_priv(dev);
2532         int status;
2533
2534         segs = skb_gso_segment(skb, dev->features & ~NETIF_F_TSO6);
2535         if (IS_ERR(segs))
2536                 goto drop;
2537
2538         while (segs) {
2539                 curr = segs;
2540                 segs = segs->next;
2541                 curr->next = NULL;
2542                 status = myri10ge_xmit(curr, dev);
2543                 if (status != 0) {
2544                         dev_kfree_skb_any(curr);
2545                         if (segs != NULL) {
2546                                 curr = segs;
2547                                 segs = segs->next;
2548                                 curr->next = NULL;
2549                                 dev_kfree_skb_any(segs);
2550                         }
2551                         goto drop;
2552                 }
2553         }
2554         dev_kfree_skb_any(skb);
2555         return 0;
2556
2557 drop:
2558         dev_kfree_skb_any(skb);
2559         mgp->stats.tx_dropped += 1;
2560         return 0;
2561 }
2562
2563 static struct net_device_stats *myri10ge_get_stats(struct net_device *dev)
2564 {
2565         struct myri10ge_priv *mgp = netdev_priv(dev);
2566         return &mgp->stats;
2567 }
2568
2569 static void myri10ge_set_multicast_list(struct net_device *dev)
2570 {
2571         struct myri10ge_priv *mgp = netdev_priv(dev);
2572         struct myri10ge_cmd cmd;
2573         struct dev_mc_list *mc_list;
2574         __be32 data[2] = { 0, 0 };
2575         int err;
2576         DECLARE_MAC_BUF(mac);
2577
2578         /* can be called from atomic contexts,
2579          * pass 1 to force atomicity in myri10ge_send_cmd() */
2580         myri10ge_change_promisc(mgp, dev->flags & IFF_PROMISC, 1);
2581
2582         /* This firmware is known to not support multicast */
2583         if (!mgp->fw_multicast_support)
2584                 return;
2585
2586         /* Disable multicast filtering */
2587
2588         err = myri10ge_send_cmd(mgp, MXGEFW_ENABLE_ALLMULTI, &cmd, 1);
2589         if (err != 0) {
2590                 printk(KERN_ERR "myri10ge: %s: Failed MXGEFW_ENABLE_ALLMULTI,"
2591                        " error status: %d\n", dev->name, err);
2592                 goto abort;
2593         }
2594
2595         if ((dev->flags & IFF_ALLMULTI) || mgp->adopted_rx_filter_bug) {
2596                 /* request to disable multicast filtering, so quit here */
2597                 return;
2598         }
2599
2600         /* Flush the filters */
2601
2602         err = myri10ge_send_cmd(mgp, MXGEFW_LEAVE_ALL_MULTICAST_GROUPS,
2603                                 &cmd, 1);
2604         if (err != 0) {
2605                 printk(KERN_ERR
2606                        "myri10ge: %s: Failed MXGEFW_LEAVE_ALL_MULTICAST_GROUPS"
2607                        ", error status: %d\n", dev->name, err);
2608                 goto abort;
2609         }
2610
2611         /* Walk the multicast list, and add each address */
2612         for (mc_list = dev->mc_list; mc_list != NULL; mc_list = mc_list->next) {
2613                 memcpy(data, &mc_list->dmi_addr, 6);
2614                 cmd.data0 = ntohl(data[0]);
2615                 cmd.data1 = ntohl(data[1]);
2616                 err = myri10ge_send_cmd(mgp, MXGEFW_JOIN_MULTICAST_GROUP,
2617                                         &cmd, 1);
2618
2619                 if (err != 0) {
2620                         printk(KERN_ERR "myri10ge: %s: Failed "
2621                                "MXGEFW_JOIN_MULTICAST_GROUP, error status:"
2622                                "%d\t", dev->name, err);
2623                         printk(KERN_ERR "MAC %s\n",
2624                                print_mac(mac, mc_list->dmi_addr));
2625                         goto abort;
2626                 }
2627         }
2628         /* Enable multicast filtering */
2629         err = myri10ge_send_cmd(mgp, MXGEFW_DISABLE_ALLMULTI, &cmd, 1);
2630         if (err != 0) {
2631                 printk(KERN_ERR "myri10ge: %s: Failed MXGEFW_DISABLE_ALLMULTI,"
2632                        "error status: %d\n", dev->name, err);
2633                 goto abort;
2634         }
2635
2636         return;
2637
2638 abort:
2639         return;
2640 }
2641
2642 static int myri10ge_set_mac_address(struct net_device *dev, void *addr)
2643 {
2644         struct sockaddr *sa = addr;
2645         struct myri10ge_priv *mgp = netdev_priv(dev);
2646         int status;
2647
2648         if (!is_valid_ether_addr(sa->sa_data))
2649                 return -EADDRNOTAVAIL;
2650
2651         status = myri10ge_update_mac_address(mgp, sa->sa_data);
2652         if (status != 0) {
2653                 printk(KERN_ERR
2654                        "myri10ge: %s: changing mac address failed with %d\n",
2655                        dev->name, status);
2656                 return status;
2657         }
2658
2659         /* change the dev structure */
2660         memcpy(dev->dev_addr, sa->sa_data, 6);
2661         return 0;
2662 }
2663
2664 static int myri10ge_change_mtu(struct net_device *dev, int new_mtu)
2665 {
2666         struct myri10ge_priv *mgp = netdev_priv(dev);
2667         int error = 0;
2668
2669         if ((new_mtu < 68) || (ETH_HLEN + new_mtu > MYRI10GE_MAX_ETHER_MTU)) {
2670                 printk(KERN_ERR "myri10ge: %s: new mtu (%d) is not valid\n",
2671                        dev->name, new_mtu);
2672                 return -EINVAL;
2673         }
2674         printk(KERN_INFO "%s: changing mtu from %d to %d\n",
2675                dev->name, dev->mtu, new_mtu);
2676         if (mgp->running) {
2677                 /* if we change the mtu on an active device, we must
2678                  * reset the device so the firmware sees the change */
2679                 myri10ge_close(dev);
2680                 dev->mtu = new_mtu;
2681                 myri10ge_open(dev);
2682         } else
2683                 dev->mtu = new_mtu;
2684
2685         return error;
2686 }
2687
2688 /*
2689  * Enable ECRC to align PCI-E Completion packets on an 8-byte boundary.
2690  * Only do it if the bridge is a root port since we don't want to disturb
2691  * any other device, except if forced with myri10ge_ecrc_enable > 1.
2692  */
2693
2694 static void myri10ge_enable_ecrc(struct myri10ge_priv *mgp)
2695 {
2696         struct pci_dev *bridge = mgp->pdev->bus->self;
2697         struct device *dev = &mgp->pdev->dev;
2698         unsigned cap;
2699         unsigned err_cap;
2700         u16 val;
2701         u8 ext_type;
2702         int ret;
2703
2704         if (!myri10ge_ecrc_enable || !bridge)
2705                 return;
2706
2707         /* check that the bridge is a root port */
2708         cap = pci_find_capability(bridge, PCI_CAP_ID_EXP);
2709         pci_read_config_word(bridge, cap + PCI_CAP_FLAGS, &val);
2710         ext_type = (val & PCI_EXP_FLAGS_TYPE) >> 4;
2711         if (ext_type != PCI_EXP_TYPE_ROOT_PORT) {
2712                 if (myri10ge_ecrc_enable > 1) {
2713                         struct pci_dev *prev_bridge, *old_bridge = bridge;
2714
2715                         /* Walk the hierarchy up to the root port
2716                          * where ECRC has to be enabled */
2717                         do {
2718                                 prev_bridge = bridge;
2719                                 bridge = bridge->bus->self;
2720                                 if (!bridge || prev_bridge == bridge) {
2721                                         dev_err(dev,
2722                                                 "Failed to find root port"
2723                                                 " to force ECRC\n");
2724                                         return;
2725                                 }
2726                                 cap =
2727                                     pci_find_capability(bridge, PCI_CAP_ID_EXP);
2728                                 pci_read_config_word(bridge,
2729                                                      cap + PCI_CAP_FLAGS, &val);
2730                                 ext_type = (val & PCI_EXP_FLAGS_TYPE) >> 4;
2731                         } while (ext_type != PCI_EXP_TYPE_ROOT_PORT);
2732
2733                         dev_info(dev,
2734                                  "Forcing ECRC on non-root port %s"
2735                                  " (enabling on root port %s)\n",
2736                                  pci_name(old_bridge), pci_name(bridge));
2737                 } else {
2738                         dev_err(dev,
2739                                 "Not enabling ECRC on non-root port %s\n",
2740                                 pci_name(bridge));
2741                         return;
2742                 }
2743         }
2744
2745         cap = pci_find_ext_capability(bridge, PCI_EXT_CAP_ID_ERR);
2746         if (!cap)
2747                 return;
2748
2749         ret = pci_read_config_dword(bridge, cap + PCI_ERR_CAP, &err_cap);
2750         if (ret) {
2751                 dev_err(dev, "failed reading ext-conf-space of %s\n",
2752                         pci_name(bridge));
2753                 dev_err(dev, "\t pci=nommconf in use? "
2754                         "or buggy/incomplete/absent ACPI MCFG attr?\n");
2755                 return;
2756         }
2757         if (!(err_cap & PCI_ERR_CAP_ECRC_GENC))
2758                 return;
2759
2760         err_cap |= PCI_ERR_CAP_ECRC_GENE;
2761         pci_write_config_dword(bridge, cap + PCI_ERR_CAP, err_cap);
2762         dev_info(dev, "Enabled ECRC on upstream bridge %s\n", pci_name(bridge));
2763 }
2764
2765 /*
2766  * The Lanai Z8E PCI-E interface achieves higher Read-DMA throughput
2767  * when the PCI-E Completion packets are aligned on an 8-byte
2768  * boundary.  Some PCI-E chip sets always align Completion packets; on
2769  * the ones that do not, the alignment can be enforced by enabling
2770  * ECRC generation (if supported).
2771  *
2772  * When PCI-E Completion packets are not aligned, it is actually more
2773  * efficient to limit Read-DMA transactions to 2KB, rather than 4KB.
2774  *
2775  * If the driver can neither enable ECRC nor verify that it has
2776  * already been enabled, then it must use a firmware image which works
2777  * around unaligned completion packets (myri10ge_ethp_z8e.dat), and it
2778  * should also ensure that it never gives the device a Read-DMA which is
2779  * larger than 2KB by setting the tx_boundary to 2KB.  If ECRC is
2780  * enabled, then the driver should use the aligned (myri10ge_eth_z8e.dat)
2781  * firmware image, and set tx_boundary to 4KB.
2782  */
2783
2784 static void myri10ge_firmware_probe(struct myri10ge_priv *mgp)
2785 {
2786         struct pci_dev *pdev = mgp->pdev;
2787         struct device *dev = &pdev->dev;
2788         int status;
2789
2790         mgp->tx_boundary = 4096;
2791         /*
2792          * Verify the max read request size was set to 4KB
2793          * before trying the test with 4KB.
2794          */
2795         status = pcie_get_readrq(pdev);
2796         if (status < 0) {
2797                 dev_err(dev, "Couldn't read max read req size: %d\n", status);
2798                 goto abort;
2799         }
2800         if (status != 4096) {
2801                 dev_warn(dev, "Max Read Request size != 4096 (%d)\n", status);
2802                 mgp->tx_boundary = 2048;
2803         }
2804         /*
2805          * load the optimized firmware (which assumes aligned PCIe
2806          * completions) in order to see if it works on this host.
2807          */
2808         mgp->fw_name = myri10ge_fw_aligned;
2809         status = myri10ge_load_firmware(mgp);
2810         if (status != 0) {
2811                 goto abort;
2812         }
2813
2814         /*
2815          * Enable ECRC if possible
2816          */
2817         myri10ge_enable_ecrc(mgp);
2818
2819         /*
2820          * Run a DMA test which watches for unaligned completions and
2821          * aborts on the first one seen.
2822          */
2823
2824         status = myri10ge_dma_test(mgp, MXGEFW_CMD_UNALIGNED_TEST);
2825         if (status == 0)
2826                 return;         /* keep the aligned firmware */
2827
2828         if (status != -E2BIG)
2829                 dev_warn(dev, "DMA test failed: %d\n", status);
2830         if (status == -ENOSYS)
2831                 dev_warn(dev, "Falling back to ethp! "
2832                          "Please install up to date fw\n");
2833 abort:
2834         /* fall back to using the unaligned firmware */
2835         mgp->tx_boundary = 2048;
2836         mgp->fw_name = myri10ge_fw_unaligned;
2837
2838 }
2839
2840 static void myri10ge_select_firmware(struct myri10ge_priv *mgp)
2841 {
2842         if (myri10ge_force_firmware == 0) {
2843                 int link_width, exp_cap;
2844                 u16 lnk;
2845
2846                 exp_cap = pci_find_capability(mgp->pdev, PCI_CAP_ID_EXP);
2847                 pci_read_config_word(mgp->pdev, exp_cap + PCI_EXP_LNKSTA, &lnk);
2848                 link_width = (lnk >> 4) & 0x3f;
2849
2850                 /* Check to see if Link is less than 8 or if the
2851                  * upstream bridge is known to provide aligned
2852                  * completions */
2853                 if (link_width < 8) {
2854                         dev_info(&mgp->pdev->dev, "PCIE x%d Link\n",
2855                                  link_width);
2856                         mgp->tx_boundary = 4096;
2857                         mgp->fw_name = myri10ge_fw_aligned;
2858                 } else {
2859                         myri10ge_firmware_probe(mgp);
2860                 }
2861         } else {
2862                 if (myri10ge_force_firmware == 1) {
2863                         dev_info(&mgp->pdev->dev,
2864                                  "Assuming aligned completions (forced)\n");
2865                         mgp->tx_boundary = 4096;
2866                         mgp->fw_name = myri10ge_fw_aligned;
2867                 } else {
2868                         dev_info(&mgp->pdev->dev,
2869                                  "Assuming unaligned completions (forced)\n");
2870                         mgp->tx_boundary = 2048;
2871                         mgp->fw_name = myri10ge_fw_unaligned;
2872                 }
2873         }
2874         if (myri10ge_fw_name != NULL) {
2875                 dev_info(&mgp->pdev->dev, "overriding firmware to %s\n",
2876                          myri10ge_fw_name);
2877                 mgp->fw_name = myri10ge_fw_name;
2878         }
2879 }
2880
2881 #ifdef CONFIG_PM
2882 static int myri10ge_suspend(struct pci_dev *pdev, pm_message_t state)
2883 {
2884         struct myri10ge_priv *mgp;
2885         struct net_device *netdev;
2886
2887         mgp = pci_get_drvdata(pdev);
2888         if (mgp == NULL)
2889                 return -EINVAL;
2890         netdev = mgp->dev;
2891
2892         netif_device_detach(netdev);
2893         if (netif_running(netdev)) {
2894                 printk(KERN_INFO "myri10ge: closing %s\n", netdev->name);
2895                 rtnl_lock();
2896                 myri10ge_close(netdev);
2897                 rtnl_unlock();
2898         }
2899         myri10ge_dummy_rdma(mgp, 0);
2900         pci_save_state(pdev);
2901         pci_disable_device(pdev);
2902
2903         return pci_set_power_state(pdev, pci_choose_state(pdev, state));
2904 }
2905
2906 static int myri10ge_resume(struct pci_dev *pdev)
2907 {
2908         struct myri10ge_priv *mgp;
2909         struct net_device *netdev;
2910         int status;
2911         u16 vendor;
2912
2913         mgp = pci_get_drvdata(pdev);
2914         if (mgp == NULL)
2915                 return -EINVAL;
2916         netdev = mgp->dev;
2917         pci_set_power_state(pdev, 0);   /* zeros conf space as a side effect */
2918         msleep(5);              /* give card time to respond */
2919         pci_read_config_word(mgp->pdev, PCI_VENDOR_ID, &vendor);
2920         if (vendor == 0xffff) {
2921                 printk(KERN_ERR "myri10ge: %s: device disappeared!\n",
2922                        mgp->dev->name);
2923                 return -EIO;
2924         }
2925
2926         status = pci_restore_state(pdev);
2927         if (status)
2928                 return status;
2929
2930         status = pci_enable_device(pdev);
2931         if (status) {
2932                 dev_err(&pdev->dev, "failed to enable device\n");
2933                 return status;
2934         }
2935
2936         pci_set_master(pdev);
2937
2938         myri10ge_reset(mgp);
2939         myri10ge_dummy_rdma(mgp, 1);
2940
2941         /* Save configuration space to be restored if the
2942          * nic resets due to a parity error */
2943         pci_save_state(pdev);
2944
2945         if (netif_running(netdev)) {
2946                 rtnl_lock();
2947                 status = myri10ge_open(netdev);
2948                 rtnl_unlock();
2949                 if (status != 0)
2950                         goto abort_with_enabled;
2951
2952         }
2953         netif_device_attach(netdev);
2954
2955         return 0;
2956
2957 abort_with_enabled:
2958         pci_disable_device(pdev);
2959         return -EIO;
2960
2961 }
2962 #endif                          /* CONFIG_PM */
2963
2964 static u32 myri10ge_read_reboot(struct myri10ge_priv *mgp)
2965 {
2966         struct pci_dev *pdev = mgp->pdev;
2967         int vs = mgp->vendor_specific_offset;
2968         u32 reboot;
2969
2970         /*enter read32 mode */
2971         pci_write_config_byte(pdev, vs + 0x10, 0x3);
2972
2973         /*read REBOOT_STATUS (0xfffffff0) */
2974         pci_write_config_dword(pdev, vs + 0x18, 0xfffffff0);
2975         pci_read_config_dword(pdev, vs + 0x14, &reboot);
2976         return reboot;
2977 }
2978
2979 /*
2980  * This watchdog is used to check whether the board has suffered
2981  * from a parity error and needs to be recovered.
2982  */
2983 static void myri10ge_watchdog(struct work_struct *work)
2984 {
2985         struct myri10ge_priv *mgp =
2986             container_of(work, struct myri10ge_priv, watchdog_work);
2987         struct myri10ge_tx_buf *tx;
2988         u32 reboot;
2989         int status;
2990         u16 cmd, vendor;
2991
2992         mgp->watchdog_resets++;
2993         pci_read_config_word(mgp->pdev, PCI_COMMAND, &cmd);
2994         if ((cmd & PCI_COMMAND_MASTER) == 0) {
2995                 /* Bus master DMA disabled?  Check to see
2996                  * if the card rebooted due to a parity error
2997                  * For now, just report it */
2998                 reboot = myri10ge_read_reboot(mgp);
2999                 printk(KERN_ERR
3000                        "myri10ge: %s: NIC rebooted (0x%x),%s resetting\n",
3001                        mgp->dev->name, reboot,
3002                        myri10ge_reset_recover ? " " : " not");
3003                 if (myri10ge_reset_recover == 0)
3004                         return;
3005
3006                 myri10ge_reset_recover--;
3007
3008                 /*
3009                  * A rebooted nic will come back with config space as
3010                  * it was after power was applied to PCIe bus.
3011                  * Attempt to restore config space which was saved
3012                  * when the driver was loaded, or the last time the
3013                  * nic was resumed from power saving mode.
3014                  */
3015                 pci_restore_state(mgp->pdev);
3016
3017                 /* save state again for accounting reasons */
3018                 pci_save_state(mgp->pdev);
3019
3020         } else {
3021                 /* if we get back -1's from our slot, perhaps somebody
3022                  * powered off our card.  Don't try to reset it in
3023                  * this case */
3024                 if (cmd == 0xffff) {
3025                         pci_read_config_word(mgp->pdev, PCI_VENDOR_ID, &vendor);
3026                         if (vendor == 0xffff) {
3027                                 printk(KERN_ERR
3028                                        "myri10ge: %s: device disappeared!\n",
3029                                        mgp->dev->name);
3030                                 return;
3031                         }
3032                 }
3033                 /* Perhaps it is a software error.  Try to reset */
3034
3035                 printk(KERN_ERR "myri10ge: %s: device timeout, resetting\n",
3036                        mgp->dev->name);
3037                 tx = &mgp->ss.tx;
3038                 printk(KERN_INFO "myri10ge: %s: %d %d %d %d %d\n",
3039                        mgp->dev->name, tx->req, tx->done,
3040                        tx->pkt_start, tx->pkt_done,
3041                        (int)ntohl(mgp->ss.fw_stats->send_done_count));
3042                 msleep(2000);
3043                 printk(KERN_INFO "myri10ge: %s: %d %d %d %d %d\n",
3044                        mgp->dev->name, tx->req, tx->done,
3045                        tx->pkt_start, tx->pkt_done,
3046                        (int)ntohl(mgp->ss.fw_stats->send_done_count));
3047         }
3048         rtnl_lock();
3049         myri10ge_close(mgp->dev);
3050         status = myri10ge_load_firmware(mgp);
3051         if (status != 0)
3052                 printk(KERN_ERR "myri10ge: %s: failed to load firmware\n",
3053                        mgp->dev->name);
3054         else
3055                 myri10ge_open(mgp->dev);
3056         rtnl_unlock();
3057 }
3058
3059 /*
3060  * We use our own timer routine rather than relying upon
3061  * netdev->tx_timeout because we have a very large hardware transmit
3062  * queue.  Due to the large queue, the netdev->tx_timeout function
3063  * cannot detect a NIC with a parity error in a timely fashion if the
3064  * NIC is lightly loaded.
3065  */
3066 static void myri10ge_watchdog_timer(unsigned long arg)
3067 {
3068         struct myri10ge_priv *mgp;
3069         struct myri10ge_slice_state *ss;
3070         u32 rx_pause_cnt;
3071
3072         mgp = (struct myri10ge_priv *)arg;
3073
3074         rx_pause_cnt = ntohl(mgp->ss.fw_stats->dropped_pause);
3075
3076         ss = &mgp->ss;
3077         if (ss->rx_small.watchdog_needed) {
3078                 myri10ge_alloc_rx_pages(mgp, &ss->rx_small,
3079                                         mgp->small_bytes + MXGEFW_PAD, 1);
3080                 if (ss->rx_small.fill_cnt - ss->rx_small.cnt >=
3081                     myri10ge_fill_thresh)
3082                         ss->rx_small.watchdog_needed = 0;
3083         }
3084         if (ss->rx_big.watchdog_needed) {
3085                 myri10ge_alloc_rx_pages(mgp, &ss->rx_big, mgp->big_bytes, 1);
3086                 if (ss->rx_big.fill_cnt - ss->rx_big.cnt >=
3087                     myri10ge_fill_thresh)
3088                         ss->rx_big.watchdog_needed = 0;
3089         }
3090
3091         if (ss->tx.req != ss->tx.done &&
3092             ss->tx.done == ss->watchdog_tx_done &&
3093             ss->watchdog_tx_req != ss->watchdog_tx_done) {
3094                 /* nic seems like it might be stuck.. */
3095                 if (rx_pause_cnt != mgp->watchdog_pause) {
3096                         if (net_ratelimit())
3097                                 printk(KERN_WARNING "myri10ge %s:"
3098                                        "TX paused, check link partner\n",
3099                                        mgp->dev->name);
3100                 } else {
3101                         schedule_work(&mgp->watchdog_work);
3102                         return;
3103                 }
3104         }
3105         /* rearm timer */
3106         mod_timer(&mgp->watchdog_timer,
3107                   jiffies + myri10ge_watchdog_timeout * HZ);
3108         ss->watchdog_tx_done = ss->tx.done;
3109         ss->watchdog_tx_req = ss->tx.req;
3110         mgp->watchdog_pause = rx_pause_cnt;
3111 }
3112
3113 static int myri10ge_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
3114 {
3115         struct net_device *netdev;
3116         struct myri10ge_priv *mgp;
3117         struct device *dev = &pdev->dev;
3118         size_t bytes;
3119         int i;
3120         int status = -ENXIO;
3121         int dac_enabled;
3122
3123         netdev = alloc_etherdev(sizeof(*mgp));
3124         if (netdev == NULL) {
3125                 dev_err(dev, "Could not allocate ethernet device\n");
3126                 return -ENOMEM;
3127         }
3128
3129         SET_NETDEV_DEV(netdev, &pdev->dev);
3130
3131         mgp = netdev_priv(netdev);
3132         mgp->dev = netdev;
3133         netif_napi_add(netdev, &mgp->ss.napi, myri10ge_poll, myri10ge_napi_weight);
3134         mgp->pdev = pdev;
3135         mgp->csum_flag = MXGEFW_FLAGS_CKSUM;
3136         mgp->pause = myri10ge_flow_control;
3137         mgp->intr_coal_delay = myri10ge_intr_coal_delay;
3138         mgp->msg_enable = netif_msg_init(myri10ge_debug, MYRI10GE_MSG_DEFAULT);
3139         init_waitqueue_head(&mgp->down_wq);
3140
3141         if (pci_enable_device(pdev)) {
3142                 dev_err(&pdev->dev, "pci_enable_device call failed\n");
3143                 status = -ENODEV;
3144                 goto abort_with_netdev;
3145         }
3146
3147         /* Find the vendor-specific cap so we can check
3148          * the reboot register later on */
3149         mgp->vendor_specific_offset
3150             = pci_find_capability(pdev, PCI_CAP_ID_VNDR);
3151
3152         /* Set our max read request to 4KB */
3153         status = pcie_set_readrq(pdev, 4096);
3154         if (status != 0) {
3155                 dev_err(&pdev->dev, "Error %d writing PCI_EXP_DEVCTL\n",
3156                         status);
3157                 goto abort_with_netdev;
3158         }
3159
3160         pci_set_master(pdev);
3161         dac_enabled = 1;
3162         status = pci_set_dma_mask(pdev, DMA_64BIT_MASK);
3163         if (status != 0) {
3164                 dac_enabled = 0;
3165                 dev_err(&pdev->dev,
3166                         "64-bit pci address mask was refused, "
3167                         "trying 32-bit\n");
3168                 status = pci_set_dma_mask(pdev, DMA_32BIT_MASK);
3169         }
3170         if (status != 0) {
3171                 dev_err(&pdev->dev, "Error %d setting DMA mask\n", status);
3172                 goto abort_with_netdev;
3173         }
3174         mgp->cmd = dma_alloc_coherent(&pdev->dev, sizeof(*mgp->cmd),
3175                                       &mgp->cmd_bus, GFP_KERNEL);
3176         if (mgp->cmd == NULL)
3177                 goto abort_with_netdev;
3178
3179         mgp->ss.fw_stats = dma_alloc_coherent(&pdev->dev, sizeof(*mgp->ss.fw_stats),
3180                                            &mgp->ss.fw_stats_bus, GFP_KERNEL);
3181         if (mgp->ss.fw_stats == NULL)
3182                 goto abort_with_cmd;
3183
3184         mgp->board_span = pci_resource_len(pdev, 0);
3185         mgp->iomem_base = pci_resource_start(pdev, 0);
3186         mgp->mtrr = -1;
3187         mgp->wc_enabled = 0;
3188 #ifdef CONFIG_MTRR
3189         mgp->mtrr = mtrr_add(mgp->iomem_base, mgp->board_span,
3190                              MTRR_TYPE_WRCOMB, 1);
3191         if (mgp->mtrr >= 0)
3192                 mgp->wc_enabled = 1;
3193 #endif
3194         /* Hack.  need to get rid of these magic numbers */
3195         mgp->sram_size =
3196             2 * 1024 * 1024 - (2 * (48 * 1024) + (32 * 1024)) - 0x100;
3197         if (mgp->sram_size > mgp->board_span) {
3198                 dev_err(&pdev->dev, "board span %ld bytes too small\n",
3199                         mgp->board_span);
3200                 goto abort_with_wc;
3201         }
3202         mgp->sram = ioremap(mgp->iomem_base, mgp->board_span);
3203         if (mgp->sram == NULL) {
3204                 dev_err(&pdev->dev, "ioremap failed for %ld bytes at 0x%lx\n",
3205                         mgp->board_span, mgp->iomem_base);
3206                 status = -ENXIO;
3207                 goto abort_with_wc;
3208         }
3209         memcpy_fromio(mgp->eeprom_strings,
3210                       mgp->sram + mgp->sram_size - MYRI10GE_EEPROM_STRINGS_SIZE,
3211                       MYRI10GE_EEPROM_STRINGS_SIZE);
3212         memset(mgp->eeprom_strings + MYRI10GE_EEPROM_STRINGS_SIZE - 2, 0, 2);
3213         status = myri10ge_read_mac_addr(mgp);
3214         if (status)
3215                 goto abort_with_ioremap;
3216
3217         for (i = 0; i < ETH_ALEN; i++)
3218                 netdev->dev_addr[i] = mgp->mac_addr[i];
3219
3220         /* allocate rx done ring */
3221         bytes = myri10ge_max_intr_slots * sizeof(*mgp->ss.rx_done.entry);
3222         mgp->ss.rx_done.entry = dma_alloc_coherent(&pdev->dev, bytes,
3223                                                 &mgp->ss.rx_done.bus, GFP_KERNEL);
3224         if (mgp->ss.rx_done.entry == NULL)
3225                 goto abort_with_ioremap;
3226         memset(mgp->ss.rx_done.entry, 0, bytes);
3227
3228         myri10ge_select_firmware(mgp);
3229
3230         status = myri10ge_load_firmware(mgp);
3231         if (status != 0) {
3232                 dev_err(&pdev->dev, "failed to load firmware\n");
3233                 goto abort_with_rx_done;
3234         }
3235
3236         status = myri10ge_reset(mgp);
3237         if (status != 0) {
3238                 dev_err(&pdev->dev, "failed reset\n");
3239                 goto abort_with_firmware;
3240         }
3241
3242         pci_set_drvdata(pdev, mgp);
3243         if ((myri10ge_initial_mtu + ETH_HLEN) > MYRI10GE_MAX_ETHER_MTU)
3244                 myri10ge_initial_mtu = MYRI10GE_MAX_ETHER_MTU - ETH_HLEN;
3245         if ((myri10ge_initial_mtu + ETH_HLEN) < 68)
3246                 myri10ge_initial_mtu = 68;
3247         netdev->mtu = myri10ge_initial_mtu;
3248         netdev->open = myri10ge_open;
3249         netdev->stop = myri10ge_close;
3250         netdev->hard_start_xmit = myri10ge_xmit;
3251         netdev->get_stats = myri10ge_get_stats;
3252         netdev->base_addr = mgp->iomem_base;
3253         netdev->change_mtu = myri10ge_change_mtu;
3254         netdev->set_multicast_list = myri10ge_set_multicast_list;
3255         netdev->set_mac_address = myri10ge_set_mac_address;
3256         netdev->features = mgp->features;
3257         if (dac_enabled)
3258                 netdev->features |= NETIF_F_HIGHDMA;
3259
3260         /* make sure we can get an irq, and that MSI can be
3261          * setup (if available).  Also ensure netdev->irq
3262          * is set to correct value if MSI is enabled */
3263         status = myri10ge_request_irq(mgp);
3264         if (status != 0)
3265                 goto abort_with_firmware;
3266         netdev->irq = pdev->irq;
3267         myri10ge_free_irq(mgp);
3268
3269         /* Save configuration space to be restored if the
3270          * nic resets due to a parity error */
3271         pci_save_state(pdev);
3272
3273         /* Setup the watchdog timer */
3274         setup_timer(&mgp->watchdog_timer, myri10ge_watchdog_timer,
3275                     (unsigned long)mgp);
3276
3277         SET_ETHTOOL_OPS(netdev, &myri10ge_ethtool_ops);
3278         INIT_WORK(&mgp->watchdog_work, myri10ge_watchdog);
3279         status = register_netdev(netdev);
3280         if (status != 0) {
3281                 dev_err(&pdev->dev, "register_netdev failed: %d\n", status);
3282                 goto abort_with_state;
3283         }
3284         dev_info(dev, "%s IRQ %d, tx bndry %d, fw %s, WC %s\n",
3285                  (mgp->msi_enabled ? "MSI" : "xPIC"),
3286                  netdev->irq, mgp->tx_boundary, mgp->fw_name,
3287                  (mgp->wc_enabled ? "Enabled" : "Disabled"));
3288
3289         return 0;
3290
3291 abort_with_state:
3292         pci_restore_state(pdev);
3293
3294 abort_with_firmware:
3295         myri10ge_dummy_rdma(mgp, 0);
3296
3297 abort_with_rx_done:
3298         bytes = myri10ge_max_intr_slots * sizeof(*mgp->ss.rx_done.entry);
3299         dma_free_coherent(&pdev->dev, bytes,
3300                           mgp->ss.rx_done.entry, mgp->ss.rx_done.bus);
3301
3302 abort_with_ioremap:
3303         iounmap(mgp->sram);
3304
3305 abort_with_wc:
3306 #ifdef CONFIG_MTRR
3307         if (mgp->mtrr >= 0)
3308                 mtrr_del(mgp->mtrr, mgp->iomem_base, mgp->board_span);
3309 #endif
3310         dma_free_coherent(&pdev->dev, sizeof(*mgp->ss.fw_stats),
3311                           mgp->ss.fw_stats, mgp->ss.fw_stats_bus);
3312
3313 abort_with_cmd:
3314         dma_free_coherent(&pdev->dev, sizeof(*mgp->cmd),
3315                           mgp->cmd, mgp->cmd_bus);
3316
3317 abort_with_netdev:
3318
3319         free_netdev(netdev);
3320         return status;
3321 }
3322
3323 /*
3324  * myri10ge_remove
3325  *
3326  * Does what is necessary to shutdown one Myrinet device. Called
3327  *   once for each Myrinet card by the kernel when a module is
3328  *   unloaded.
3329  */
3330 static void myri10ge_remove(struct pci_dev *pdev)
3331 {
3332         struct myri10ge_priv *mgp;
3333         struct net_device *netdev;
3334         size_t bytes;
3335
3336         mgp = pci_get_drvdata(pdev);
3337         if (mgp == NULL)
3338                 return;
3339
3340         flush_scheduled_work();
3341         netdev = mgp->dev;
3342         unregister_netdev(netdev);
3343
3344         myri10ge_dummy_rdma(mgp, 0);
3345
3346         /* avoid a memory leak */
3347         pci_restore_state(pdev);
3348
3349         bytes = myri10ge_max_intr_slots * sizeof(*mgp->ss.rx_done.entry);
3350         dma_free_coherent(&pdev->dev, bytes,
3351                           mgp->ss.rx_done.entry, mgp->ss.rx_done.bus);
3352
3353         iounmap(mgp->sram);
3354
3355 #ifdef CONFIG_MTRR
3356         if (mgp->mtrr >= 0)
3357                 mtrr_del(mgp->mtrr, mgp->iomem_base, mgp->board_span);
3358 #endif
3359         dma_free_coherent(&pdev->dev, sizeof(*mgp->ss.fw_stats),
3360                           mgp->ss.fw_stats, mgp->ss.fw_stats_bus);
3361
3362         dma_free_coherent(&pdev->dev, sizeof(*mgp->cmd),
3363                           mgp->cmd, mgp->cmd_bus);
3364
3365         free_netdev(netdev);
3366         pci_set_drvdata(pdev, NULL);
3367 }
3368
3369 #define PCI_DEVICE_ID_MYRICOM_MYRI10GE_Z8E      0x0008
3370 #define PCI_DEVICE_ID_MYRICOM_MYRI10GE_Z8E_9    0x0009
3371
3372 static struct pci_device_id myri10ge_pci_tbl[] = {
3373         {PCI_DEVICE(PCI_VENDOR_ID_MYRICOM, PCI_DEVICE_ID_MYRICOM_MYRI10GE_Z8E)},
3374         {PCI_DEVICE
3375          (PCI_VENDOR_ID_MYRICOM, PCI_DEVICE_ID_MYRICOM_MYRI10GE_Z8E_9)},
3376         {0},
3377 };
3378
3379 static struct pci_driver myri10ge_driver = {
3380         .name = "myri10ge",
3381         .probe = myri10ge_probe,
3382         .remove = myri10ge_remove,
3383         .id_table = myri10ge_pci_tbl,
3384 #ifdef CONFIG_PM
3385         .suspend = myri10ge_suspend,
3386         .resume = myri10ge_resume,
3387 #endif
3388 };
3389
3390 static __init int myri10ge_init_module(void)
3391 {
3392         printk(KERN_INFO "%s: Version %s\n", myri10ge_driver.name,
3393                MYRI10GE_VERSION_STR);
3394         return pci_register_driver(&myri10ge_driver);
3395 }
3396
3397 module_init(myri10ge_init_module);
3398
3399 static __exit void myri10ge_cleanup_module(void)
3400 {
3401         pci_unregister_driver(&myri10ge_driver);
3402 }
3403
3404 module_exit(myri10ge_cleanup_module);