drivers/scsi/cxgb3i/cxgb3i_iscsi.c

   1 /* cxgb3i_iscsi.c: Chelsio S3xx iSCSI driver.
   2  *
   3  * Copyright (c) 2008 Chelsio Communications, Inc.
   4  * Copyright (c) 2008 Mike Christie
   5  * Copyright (c) 2008 Red Hat, Inc.  All rights reserved.
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation.
  10  *
  11  * Written by: Karen Xie (kxie@chelsio.com)
  12  */
  13
  14 #include <linux/inet.h>
  15 #include <linux/crypto.h>
  16 #include <net/tcp.h>
  17 #include <scsi/scsi_cmnd.h>
  18 #include <scsi/scsi_device.h>
  19 #include <scsi/scsi_eh.h>
  20 #include <scsi/scsi_host.h>
  21 #include <scsi/scsi.h>
  22 #include <scsi/iscsi_proto.h>
  23 #include <scsi/libiscsi.h>
  24 #include <scsi/scsi_transport_iscsi.h>
  25
  26 #include "cxgb3i.h"
  27 #include "cxgb3i_pdu.h"
  28
  29 #ifdef __DEBUG_CXGB3I_TAG__
  30 #define cxgb3i_tag_debug        cxgb3i_log_debug
  31 #else
  32 #define cxgb3i_tag_debug(fmt...)
  33 #endif
  34
  35 #ifdef __DEBUG_CXGB3I_API__
  36 #define cxgb3i_api_debug        cxgb3i_log_debug
  37 #else
  38 #define cxgb3i_api_debug(fmt...)
  39 #endif
  40
  41 /*
  42  * align pdu size to multiple of 512 for better performance
  43  */
  44 #define align_pdu_size(n) do { n = (n) & (~511); } while (0)
  45
  46 static struct scsi_transport_template *cxgb3i_scsi_transport;
  47 static struct scsi_host_template cxgb3i_host_template;
  48 static struct iscsi_transport cxgb3i_iscsi_transport;
  49 static unsigned char sw_tag_idx_bits;
  50 static unsigned char sw_tag_age_bits;
  51
  52 static LIST_HEAD(cxgb3i_snic_list);
  53 static DEFINE_RWLOCK(cxgb3i_snic_rwlock);
  54
  55 /**
  56  * cxgb3i_adapter_add - init a s3 adapter structure and any h/w settings
  57  * @t3dev: t3cdev adapter
  58  * return the resulting cxgb3i_adapter struct
  59  */
  60 struct cxgb3i_adapter *cxgb3i_adapter_add(struct t3cdev *t3dev)
  61 {
  62         struct cxgb3i_adapter *snic;
  63         struct adapter *adapter = tdev2adap(t3dev);
  64         int i;
  65
  66         snic = kzalloc(sizeof(*snic), GFP_KERNEL);
  67         if (!snic) {
  68                 cxgb3i_api_debug("cxgb3 %s, OOM.\n", t3dev->name);
  69                 return NULL;
  70         }
  71         spin_lock_init(&snic->lock);
  72
  73         snic->tdev = t3dev;
  74         snic->pdev = adapter->pdev;
  75         snic->tag_format.sw_bits = sw_tag_idx_bits + sw_tag_age_bits;
  76
  77         if (cxgb3i_adapter_ddp_init(t3dev, &snic->tag_format,
  78                                     &snic->tx_max_size,
  79                                     &snic->rx_max_size) < 0)
  80                 goto free_snic;
  81
  82         for_each_port(adapter, i) {
  83                 snic->hba[i] = cxgb3i_hba_host_add(snic, adapter->port[i]);
  84                 if (!snic->hba[i])
  85                         goto ulp_cleanup;
  86         }
  87         snic->hba_cnt = adapter->params.nports;
  88
  89         /* add to the list */
  90         write_lock(&cxgb3i_snic_rwlock);
  91         list_add_tail(&snic->list_head, &cxgb3i_snic_list);
  92         write_unlock(&cxgb3i_snic_rwlock);
  93
  94         return snic;
  95
  96 ulp_cleanup:
  97         cxgb3i_adapter_ddp_cleanup(t3dev);
  98 free_snic:
  99         kfree(snic);
 100         return NULL;
 101 }
 102
 103 /**
 104  * cxgb3i_adapter_remove - release all the resources held and cleanup any
 105  *      h/w settings
 106  * @t3dev: t3cdev adapter
 107  */
 108 void cxgb3i_adapter_remove(struct t3cdev *t3dev)
 109 {
 110         int i;
 111         struct cxgb3i_adapter *snic;
 112
 113         /* remove from the list */
 114         write_lock(&cxgb3i_snic_rwlock);
 115         list_for_each_entry(snic, &cxgb3i_snic_list, list_head) {
 116                 if (snic->tdev == t3dev) {
 117                         list_del(&snic->list_head);
 118                         break;
 119                 }
 120         }
 121         write_unlock(&cxgb3i_snic_rwlock);
 122
 123         if (snic) {
 124                 for (i = 0; i < snic->hba_cnt; i++) {
 125                         if (snic->hba[i]) {
 126                                 cxgb3i_hba_host_remove(snic->hba[i]);
 127                                 snic->hba[i] = NULL;
 128                         }
 129                 }
 130
 131                 /* release ddp resources */
 132                 cxgb3i_adapter_ddp_cleanup(snic->tdev);
 133                 kfree(snic);
 134         }
 135 }
 136
 137 /**
 138  * cxgb3i_hba_find_by_netdev - find the cxgb3i_hba structure with a given
 139  *      net_device
 140  * @t3dev: t3cdev adapter
 141  */
 142 struct cxgb3i_hba *cxgb3i_hba_find_by_netdev(struct net_device *ndev)
 143 {
 144         struct cxgb3i_adapter *snic;
 145         int i;
 146
 147         read_lock(&cxgb3i_snic_rwlock);
 148         list_for_each_entry(snic, &cxgb3i_snic_list, list_head) {
 149                 for (i = 0; i < snic->hba_cnt; i++) {
 150                         if (snic->hba[i]->ndev == ndev) {
 151                                 read_unlock(&cxgb3i_snic_rwlock);
 152                                 return snic->hba[i];
 153                         }
 154                 }
 155         }
 156         read_unlock(&cxgb3i_snic_rwlock);
 157         return NULL;
 158 }
 159
 160 /**
 161  * cxgb3i_hba_host_add - register a new host with scsi/iscsi
 162  * @snic: the cxgb3i adapter
 163  * @ndev: associated net_device
 164  */
 165 struct cxgb3i_hba *cxgb3i_hba_host_add(struct cxgb3i_adapter *snic,
 166                                        struct net_device *ndev)
 167 {
 168         struct cxgb3i_hba *hba;
 169         struct Scsi_Host *shost;
 170         int err;
 171
 172         shost = iscsi_host_alloc(&cxgb3i_host_template,
 173                                  sizeof(struct cxgb3i_hba),
 174                                  CXGB3I_SCSI_QDEPTH_DFLT);
 175         if (!shost) {
 176                 cxgb3i_log_info("iscsi_host_alloc failed.\n");
 177                 return NULL;
 178         }
 179
 180         shost->transportt = cxgb3i_scsi_transport;
 181         shost->max_lun = CXGB3I_MAX_LUN;
 182         shost->max_id = CXGB3I_MAX_TARGET;
 183         shost->max_channel = 0;
 184         shost->max_cmd_len = 16;
 185
 186         hba = iscsi_host_priv(shost);
 187         hba->snic = snic;
 188         hba->ndev = ndev;
 189         hba->shost = shost;
 190
 191         pci_dev_get(snic->pdev);
 192         err = iscsi_host_add(shost, &snic->pdev->dev);
 193         if (err) {
 194                 cxgb3i_log_info("iscsi_host_add failed.\n");
 195                 goto pci_dev_put;
 196         }
 197
 198         cxgb3i_api_debug("shost 0x%p, hba 0x%p, no %u.\n",
 199                          shost, hba, shost->host_no);
 200
 201         return hba;
 202
 203 pci_dev_put:
 204         pci_dev_put(snic->pdev);
 205         scsi_host_put(shost);
 206         return NULL;
 207 }
 208
 209 /**
 210  * cxgb3i_hba_host_remove - de-register the host with scsi/iscsi
 211  * @hba: the cxgb3i hba
 212  */
 213 void cxgb3i_hba_host_remove(struct cxgb3i_hba *hba)
 214 {
 215         cxgb3i_api_debug("shost 0x%p, hba 0x%p, no %u.\n",
 216                          hba->shost, hba, hba->shost->host_no);
 217         iscsi_host_remove(hba->shost);
 218         pci_dev_put(hba->snic->pdev);
 219         iscsi_host_free(hba->shost);
 220 }
 221
 222 /**
 223  * cxgb3i_ep_connect - establish TCP connection to target portal
 224  * @dst_addr:           target IP address
 225  * @non_blocking:       blocking or non-blocking call
 226  *
 227  * Initiates a TCP/IP connection to the dst_addr
 228  */
 229 static struct iscsi_endpoint *cxgb3i_ep_connect(struct sockaddr *dst_addr,
 230                                                 int non_blocking)
 231 {
 232         struct iscsi_endpoint *ep;
 233         struct cxgb3i_endpoint *cep;
 234         struct cxgb3i_hba *hba;
 235         struct s3_conn *c3cn = NULL;
 236         int err = 0;
 237
 238         c3cn = cxgb3i_c3cn_create();
 239         if (!c3cn) {
 240                 cxgb3i_log_info("ep connect OOM.\n");
 241                 err = -ENOMEM;
 242                 goto release_conn;
 243         }
 244
 245         err = cxgb3i_c3cn_connect(c3cn, (struct sockaddr_in *)dst_addr);
 246         if (err < 0) {
 247                 cxgb3i_log_info("ep connect failed.\n");
 248                 goto release_conn;
 249         }
 250         hba = cxgb3i_hba_find_by_netdev(c3cn->dst_cache->dev);
 251         if (!hba) {
 252                 err = -ENOSPC;
 253                 cxgb3i_log_info("NOT going through cxgbi device.\n");
 254                 goto release_conn;
 255         }
 256         if (c3cn_is_closing(c3cn)) {
 257                 err = -ENOSPC;
 258                 cxgb3i_log_info("ep connect unable to connect.\n");
 259                 goto release_conn;
 260         }
 261
 262         ep = iscsi_create_endpoint(sizeof(*cep));
 263         if (!ep) {
 264                 err = -ENOMEM;
 265                 cxgb3i_log_info("iscsi alloc ep, OOM.\n");
 266                 goto release_conn;
 267         }
 268         cep = ep->dd_data;
 269         cep->c3cn = c3cn;
 270         cep->hba = hba;
 271
 272         cxgb3i_api_debug("ep 0x%p, 0x%p, c3cn 0x%p, hba 0x%p.\n",
 273                           ep, cep, c3cn, hba);
 274         return ep;
 275
 276 release_conn:
 277         cxgb3i_api_debug("conn 0x%p failed, release.\n", c3cn);
 278         if (c3cn)
 279                 cxgb3i_c3cn_release(c3cn);
 280         return ERR_PTR(err);
 281 }
 282
 283 /**
 284  * cxgb3i_ep_poll - polls for TCP connection establishement
 285  * @ep:         TCP connection (endpoint) handle
 286  * @timeout_ms: timeout value in milli secs
 287  *
 288  * polls for TCP connect request to complete
 289  */
 290 static int cxgb3i_ep_poll(struct iscsi_endpoint *ep, int timeout_ms)
 291 {
 292         struct cxgb3i_endpoint *cep = ep->dd_data;
 293         struct s3_conn *c3cn = cep->c3cn;
 294
 295         if (!c3cn_is_established(c3cn))
 296                 return 0;
 297         cxgb3i_api_debug("ep 0x%p, c3cn 0x%p established.\n", ep, c3cn);
 298         return 1;
 299 }
 300
 301 /**
 302  * cxgb3i_ep_disconnect - teardown TCP connection
 303  * @ep:         TCP connection (endpoint) handle
 304  *
 305  * teardown TCP connection
 306  */
 307 static void cxgb3i_ep_disconnect(struct iscsi_endpoint *ep)
 308 {
 309         struct cxgb3i_endpoint *cep = ep->dd_data;
 310         struct cxgb3i_conn *cconn = cep->cconn;
 311
 312         cxgb3i_api_debug("ep 0x%p, cep 0x%p.\n", ep, cep);
 313
 314         if (cconn && cconn->conn) {
 315                 /*
 316                  * stop the xmit path so the xmit_pdu function is
 317                  * not being called
 318                  */
 319                 iscsi_suspend_tx(cconn->conn);
 320
 321                 write_lock_bh(&cep->c3cn->callback_lock);
 322                 cep->c3cn->user_data = NULL;
 323                 cconn->cep = NULL;
 324                 write_unlock_bh(&cep->c3cn->callback_lock);
 325         }
 326
 327         cxgb3i_api_debug("ep 0x%p, cep 0x%p, release c3cn 0x%p.\n",
 328                          ep, cep, cep->c3cn);
 329         cxgb3i_c3cn_release(cep->c3cn);
 330         iscsi_destroy_endpoint(ep);
 331 }
 332
 333 /**
 334  * cxgb3i_session_create - create a new iscsi session
 335  * @cmds_max:           max # of commands
 336  * @qdepth:             scsi queue depth
 337  * @initial_cmdsn:      initial iscsi CMDSN for this session
 338  * @host_no:            pointer to return host no
 339  *
 340  * Creates a new iSCSI session
 341  */
 342 static struct iscsi_cls_session *
 343 cxgb3i_session_create(struct iscsi_endpoint *ep, u16 cmds_max, u16 qdepth,
 344                       u32 initial_cmdsn, u32 *host_no)
 345 {
 346         struct cxgb3i_endpoint *cep;
 347         struct cxgb3i_hba *hba;
 348         struct Scsi_Host *shost;
 349         struct iscsi_cls_session *cls_session;
 350         struct iscsi_session *session;
 351
 352         if (!ep) {
 353                 cxgb3i_log_error("%s, missing endpoint.\n", __func__);
 354                 return NULL;
 355         }
 356
 357         cep = ep->dd_data;
 358         hba = cep->hba;
 359         shost = hba->shost;
 360         cxgb3i_api_debug("ep 0x%p, cep 0x%p, hba 0x%p.\n", ep, cep, hba);
 361         BUG_ON(hba != iscsi_host_priv(shost));
 362
 363         *host_no = shost->host_no;
 364
 365         cls_session = iscsi_session_setup(&cxgb3i_iscsi_transport, shost,
 366                                           cmds_max,
 367                                           sizeof(struct iscsi_tcp_task) +
 368                                           sizeof(struct cxgb3i_task_data),
 369                                           initial_cmdsn, ISCSI_MAX_TARGET);
 370         if (!cls_session)
 371                 return NULL;
 372         session = cls_session->dd_data;
 373         if (iscsi_tcp_r2tpool_alloc(session))
 374                 goto remove_session;
 375
 376         return cls_session;
 377
 378 remove_session:
 379         iscsi_session_teardown(cls_session);
 380         return NULL;
 381 }
 382
 383 /**
 384  * cxgb3i_session_destroy - destroys iscsi session
 385  * @cls_session:        pointer to iscsi cls session
 386  *
 387  * Destroys an iSCSI session instance and releases its all resources held
 388  */
 389 static void cxgb3i_session_destroy(struct iscsi_cls_session *cls_session)
 390 {
 391         cxgb3i_api_debug("sess 0x%p.\n", cls_session);
 392         iscsi_tcp_r2tpool_free(cls_session->dd_data);
 393         iscsi_session_teardown(cls_session);
 394 }
 395
 396 /**
 397  * cxgb3i_conn_max_xmit_dlength -- check the max. xmit pdu segment size,
 398  * reduce it to be within the hardware limit if needed
 399  * @conn: iscsi connection
 400  */
 401 static inline int cxgb3i_conn_max_xmit_dlength(struct iscsi_conn *conn)
 402
 403 {
 404         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
 405         struct cxgb3i_conn *cconn = tcp_conn->dd_data;
 406         unsigned int max = max(512 * MAX_SKB_FRAGS, SKB_TX_HEADROOM);
 407
 408         max = min(cconn->hba->snic->tx_max_size, max);
 409         if (conn->max_xmit_dlength)
 410                 conn->max_xmit_dlength = min(conn->max_xmit_dlength, max);
 411         else
 412                 conn->max_xmit_dlength = max;
 413         align_pdu_size(conn->max_xmit_dlength);
 414         cxgb3i_api_debug("conn 0x%p, max xmit %u.\n",
 415                          conn, conn->max_xmit_dlength);
 416         return 0;
 417 }
 418
 419 /**
 420  * cxgb3i_conn_max_recv_dlength -- check the max. recv pdu segment size against
 421  * the hardware limit
 422  * @conn: iscsi connection
 423  * return 0 if the value is valid, < 0 otherwise.
 424  */
 425 static inline int cxgb3i_conn_max_recv_dlength(struct iscsi_conn *conn)
 426 {
 427         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
 428         struct cxgb3i_conn *cconn = tcp_conn->dd_data;
 429         unsigned int max = cconn->hba->snic->rx_max_size;
 430
 431         align_pdu_size(max);
 432         if (conn->max_recv_dlength) {
 433                 if (conn->max_recv_dlength > max) {
 434                         cxgb3i_log_error("MaxRecvDataSegmentLength %u too big."
 435                                          " Need to be <= %u.\n",
 436                                          conn->max_recv_dlength, max);
 437                         return -EINVAL;
 438                 }
 439                 conn->max_recv_dlength = min(conn->max_recv_dlength, max);
 440                 align_pdu_size(conn->max_recv_dlength);
 441         } else
 442                 conn->max_recv_dlength = max;
 443         cxgb3i_api_debug("conn 0x%p, max recv %u.\n",
 444                          conn, conn->max_recv_dlength);
 445         return 0;
 446 }
 447
 448 /**
 449  * cxgb3i_conn_create - create iscsi connection instance
 450  * @cls_session:        pointer to iscsi cls session
 451  * @cid:                iscsi cid
 452  *
 453  * Creates a new iSCSI connection instance for a given session
 454  */
 455 static struct iscsi_cls_conn *cxgb3i_conn_create(struct iscsi_cls_session
 456                                                  *cls_session, u32 cid)
 457 {
 458         struct iscsi_cls_conn *cls_conn;
 459         struct iscsi_conn *conn;
 460         struct iscsi_tcp_conn *tcp_conn;
 461         struct cxgb3i_conn *cconn;
 462
 463         cxgb3i_api_debug("sess 0x%p, cid %u.\n", cls_session, cid);
 464
 465         cls_conn = iscsi_tcp_conn_setup(cls_session, sizeof(*cconn), cid);
 466         if (!cls_conn)
 467                 return NULL;
 468         conn = cls_conn->dd_data;
 469         tcp_conn = conn->dd_data;
 470         cconn = tcp_conn->dd_data;
 471
 472         cconn->conn = conn;
 473         return cls_conn;
 474 }
 475
 476 /**
 477  * cxgb3i_conn_bind - binds iscsi sess, conn and endpoint together
 478  * @cls_session:        pointer to iscsi cls session
 479  * @cls_conn:           pointer to iscsi cls conn
 480  * @transport_eph:      64-bit EP handle
 481  * @is_leading:         leading connection on this session?
 482  *
 483  * Binds together an iSCSI session, an iSCSI connection and a
 484  *      TCP connection. This routine returns error code if the TCP
 485  *      connection does not belong on the device iSCSI sess/conn is bound
 486  */
 487
 488 static int cxgb3i_conn_bind(struct iscsi_cls_session *cls_session,
 489                             struct iscsi_cls_conn *cls_conn,
 490                             u64 transport_eph, int is_leading)
 491 {
 492         struct iscsi_conn *conn = cls_conn->dd_data;
 493         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
 494         struct cxgb3i_conn *cconn = tcp_conn->dd_data;
 495         struct cxgb3i_adapter *snic;
 496         struct iscsi_endpoint *ep;
 497         struct cxgb3i_endpoint *cep;
 498         struct s3_conn *c3cn;
 499         int err;
 500
 501         ep = iscsi_lookup_endpoint(transport_eph);
 502         if (!ep)
 503                 return -EINVAL;
 504
 505         /* setup ddp pagesize */
 506         cep = ep->dd_data;
 507         c3cn = cep->c3cn;
 508         snic = cep->hba->snic;
 509         err = cxgb3i_setup_conn_host_pagesize(snic->tdev, c3cn->tid, 0);
 510         if (err < 0)
 511                 return err;
 512
 513         cxgb3i_api_debug("ep 0x%p, cls sess 0x%p, cls conn 0x%p.\n",
 514                          ep, cls_session, cls_conn);
 515
 516         err = iscsi_conn_bind(cls_session, cls_conn, is_leading);
 517         if (err)
 518                 return -EINVAL;
 519
 520         /* calculate the tag idx bits needed for this conn based on cmds_max */
 521         cconn->task_idx_bits = (__ilog2_u32(conn->session->cmds_max - 1)) + 1;
 522         cxgb3i_api_debug("session cmds_max 0x%x, bits %u.\n",
 523                          conn->session->cmds_max, cconn->task_idx_bits);
 524
 525         read_lock(&c3cn->callback_lock);
 526         c3cn->user_data = conn;
 527         cconn->hba = cep->hba;
 528         cconn->cep = cep;
 529         cep->cconn = cconn;
 530         read_unlock(&c3cn->callback_lock);
 531
 532         cxgb3i_conn_max_xmit_dlength(conn);
 533         cxgb3i_conn_max_recv_dlength(conn);
 534
 535         spin_lock_bh(&conn->session->lock);
 536         sprintf(conn->portal_address, NIPQUAD_FMT,
 537                 NIPQUAD(c3cn->daddr.sin_addr.s_addr));
 538         conn->portal_port = ntohs(c3cn->daddr.sin_port);
 539         spin_unlock_bh(&conn->session->lock);
 540
 541         /* init recv engine */
 542         iscsi_tcp_hdr_recv_prep(tcp_conn);
 543
 544         return 0;
 545 }
 546
 547 /**
 548  * cxgb3i_conn_get_param - return iscsi connection parameter to caller
 549  * @cls_conn:   pointer to iscsi cls conn
 550  * @param:      parameter type identifier
 551  * @buf:        buffer pointer
 552  *
 553  * returns iSCSI connection parameters
 554  */
 555 static int cxgb3i_conn_get_param(struct iscsi_cls_conn *cls_conn,
 556                                  enum iscsi_param param, char *buf)
 557 {
 558         struct iscsi_conn *conn = cls_conn->dd_data;
 559         int len;
 560
 561         cxgb3i_api_debug("cls_conn 0x%p, param %d.\n", cls_conn, param);
 562
 563         switch (param) {
 564         case ISCSI_PARAM_CONN_PORT:
 565                 spin_lock_bh(&conn->session->lock);
 566                 len = sprintf(buf, "%hu\n", conn->portal_port);
 567                 spin_unlock_bh(&conn->session->lock);
 568                 break;
 569         case ISCSI_PARAM_CONN_ADDRESS:
 570                 spin_lock_bh(&conn->session->lock);
 571                 len = sprintf(buf, "%s\n", conn->portal_address);
 572                 spin_unlock_bh(&conn->session->lock);
 573                 break;
 574         default:
 575                 return iscsi_conn_get_param(cls_conn, param, buf);
 576         }
 577
 578         return len;
 579 }
 580
 581 /**
 582  * cxgb3i_conn_set_param - set iscsi connection parameter
 583  * @cls_conn:   pointer to iscsi cls conn
 584  * @param:      parameter type identifier
 585  * @buf:        buffer pointer
 586  * @buflen:     buffer length
 587  *
 588  * set iSCSI connection parameters
 589  */
 590 static int cxgb3i_conn_set_param(struct iscsi_cls_conn *cls_conn,
 591                                  enum iscsi_param param, char *buf, int buflen)
 592 {
 593         struct iscsi_conn *conn = cls_conn->dd_data;
 594         struct iscsi_session *session = conn->session;
 595         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
 596         struct cxgb3i_conn *cconn = tcp_conn->dd_data;
 597         struct cxgb3i_adapter *snic = cconn->hba->snic;
 598         struct s3_conn *c3cn = cconn->cep->c3cn;
 599         int value, err = 0;
 600
 601         switch (param) {
 602         case ISCSI_PARAM_HDRDGST_EN:
 603                 err = iscsi_set_param(cls_conn, param, buf, buflen);
 604                 if (!err && conn->hdrdgst_en)
 605                         err = cxgb3i_setup_conn_digest(snic->tdev, c3cn->tid,
 606                                                         conn->hdrdgst_en,
 607                                                         conn->datadgst_en, 0);
 608                 break;
 609         case ISCSI_PARAM_DATADGST_EN:
 610                 err = iscsi_set_param(cls_conn, param, buf, buflen);
 611                 if (!err && conn->datadgst_en)
 612                         err = cxgb3i_setup_conn_digest(snic->tdev, c3cn->tid,
 613                                                         conn->hdrdgst_en,
 614                                                         conn->datadgst_en, 0);
 615                 break;
 616         case ISCSI_PARAM_MAX_R2T:
 617                 sscanf(buf, "%d", &value);
 618                 if (value <= 0 || !is_power_of_2(value))
 619                         return -EINVAL;
 620                 if (session->max_r2t == value)
 621                         break;
 622                 iscsi_tcp_r2tpool_free(session);
 623                 err = iscsi_set_param(cls_conn, param, buf, buflen);
 624                 if (!err && iscsi_tcp_r2tpool_alloc(session))
 625                         return -ENOMEM;
 626         case ISCSI_PARAM_MAX_RECV_DLENGTH:
 627                 err = iscsi_set_param(cls_conn, param, buf, buflen);
 628                 if (!err)
 629                         err = cxgb3i_conn_max_recv_dlength(conn);
 630                 break;
 631         case ISCSI_PARAM_MAX_XMIT_DLENGTH:
 632                 err = iscsi_set_param(cls_conn, param, buf, buflen);
 633                 if (!err)
 634                         err = cxgb3i_conn_max_xmit_dlength(conn);
 635                 break;
 636         default:
 637                 return iscsi_set_param(cls_conn, param, buf, buflen);
 638         }
 639         return err;
 640 }
 641
 642 /**
 643  * cxgb3i_host_set_param - configure host (adapter) related parameters
 644  * @shost:      scsi host pointer
 645  * @param:      parameter type identifier
 646  * @buf:        buffer pointer
 647  */
 648 static int cxgb3i_host_set_param(struct Scsi_Host *shost,
 649                                  enum iscsi_host_param param,
 650                                  char *buf, int buflen)
 651 {
 652         struct cxgb3i_hba *hba = iscsi_host_priv(shost);
 653
 654         cxgb3i_api_debug("param %d, buf %s.\n", param, buf);
 655
 656         switch (param) {
 657         case ISCSI_HOST_PARAM_IPADDRESS:
 658         {
 659                 __be32 addr = in_aton(buf);
 660                 cxgb3i_set_private_ipv4addr(hba->ndev, addr);
 661                 return 0;
 662         }
 663         case ISCSI_HOST_PARAM_HWADDRESS:
 664         case ISCSI_HOST_PARAM_NETDEV_NAME:
 665                 /* ignore */
 666                 return 0;
 667         default:
 668                 return iscsi_host_set_param(shost, param, buf, buflen);
 669         }
 670 }
 671
 672 /**
 673  * cxgb3i_host_get_param - returns host (adapter) related parameters
 674  * @shost:      scsi host pointer
 675  * @param:      parameter type identifier
 676  * @buf:        buffer pointer
 677  */
 678 static int cxgb3i_host_get_param(struct Scsi_Host *shost,
 679                                  enum iscsi_host_param param, char *buf)
 680 {
 681         struct cxgb3i_hba *hba = iscsi_host_priv(shost);
 682         int len = 0;
 683
 684         cxgb3i_api_debug("hba %s, param %d.\n", hba->ndev->name, param);
 685
 686         switch (param) {
 687         case ISCSI_HOST_PARAM_HWADDRESS:
 688                 len = sysfs_format_mac(buf, hba->ndev->dev_addr, 6);
 689                 break;
 690         case ISCSI_HOST_PARAM_NETDEV_NAME:
 691                 len = sprintf(buf, "%s\n", hba->ndev->name);
 692                 break;
 693         case ISCSI_HOST_PARAM_IPADDRESS:
 694         {
 695                 __be32 addr;
 696
 697                 addr = cxgb3i_get_private_ipv4addr(hba->ndev);
 698                 len = sprintf(buf, NIPQUAD_FMT, NIPQUAD(addr));
 699                 break;
 700         }
 701         default:
 702                 return iscsi_host_get_param(shost, param, buf);
 703         }
 704         return len;
 705 }
 706
 707 /**
 708  * cxgb3i_conn_get_stats - returns iSCSI stats
 709  * @cls_conn:   pointer to iscsi cls conn
 710  * @stats:      pointer to iscsi statistic struct
 711  */
 712 static void cxgb3i_conn_get_stats(struct iscsi_cls_conn *cls_conn,
 713                                   struct iscsi_stats *stats)
 714 {
 715         struct iscsi_conn *conn = cls_conn->dd_data;
 716
 717         stats->txdata_octets = conn->txdata_octets;
 718         stats->rxdata_octets = conn->rxdata_octets;
 719         stats->scsicmd_pdus = conn->scsicmd_pdus_cnt;
 720         stats->dataout_pdus = conn->dataout_pdus_cnt;
 721         stats->scsirsp_pdus = conn->scsirsp_pdus_cnt;
 722         stats->datain_pdus = conn->datain_pdus_cnt;
 723         stats->r2t_pdus = conn->r2t_pdus_cnt;
 724         stats->tmfcmd_pdus = conn->tmfcmd_pdus_cnt;
 725         stats->tmfrsp_pdus = conn->tmfrsp_pdus_cnt;
 726         stats->digest_err = 0;
 727         stats->timeout_err = 0;
 728         stats->custom_length = 1;
 729         strcpy(stats->custom[0].desc, "eh_abort_cnt");
 730         stats->custom[0].value = conn->eh_abort_cnt;
 731 }
 732
 733 /**
 734  * cxgb3i_parse_itt - get the idx and age bits from a given tag
 735  * @conn:       iscsi connection
 736  * @itt:        itt tag
 737  * @idx:        task index, filled in by this function
 738  * @age:        session age, filled in by this function
 739  */
 740 static void cxgb3i_parse_itt(struct iscsi_conn *conn, itt_t itt,
 741                              int *idx, int *age)
 742 {
 743         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
 744         struct cxgb3i_conn *cconn = tcp_conn->dd_data;
 745         struct cxgb3i_adapter *snic = cconn->hba->snic;
 746         u32 tag = ntohl((__force u32) itt);
 747         u32 sw_bits;
 748
 749         sw_bits = cxgb3i_tag_nonrsvd_bits(&snic->tag_format, tag);
 750         if (idx)
 751                 *idx = sw_bits & ((1 << cconn->task_idx_bits) - 1);
 752         if (age)
 753                 *age = (sw_bits >> cconn->task_idx_bits) & ISCSI_AGE_MASK;
 754
 755         cxgb3i_tag_debug("parse tag 0x%x/0x%x, sw 0x%x, itt 0x%x, age 0x%x.\n",
 756                          tag, itt, sw_bits, idx ? *idx : 0xFFFFF,
 757                          age ? *age : 0xFF);
 758 }
 759
 760 /**
 761  * cxgb3i_reserve_itt - generate tag for a give task
 762  * Try to set up ddp for a scsi read task.
 763  * @task: iscsi task
 764  * @hdr_itt: tag, filled in by this function
 765  */
 766 int cxgb3i_reserve_itt(struct iscsi_task *task, itt_t *hdr_itt)
 767 {
 768         struct scsi_cmnd *sc = task->sc;
 769         struct iscsi_conn *conn = task->conn;
 770         struct iscsi_session *sess = conn->session;
 771         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
 772         struct cxgb3i_conn *cconn = tcp_conn->dd_data;
 773         struct cxgb3i_adapter *snic = cconn->hba->snic;
 774         struct cxgb3i_tag_format *tformat = &snic->tag_format;
 775         u32 sw_tag = (sess->age << cconn->task_idx_bits) | task->itt;
 776         u32 tag;
 777         int err = -EINVAL;
 778
 779         if (sc &&
 780             (scsi_bidi_cmnd(sc) || sc->sc_data_direction == DMA_FROM_DEVICE) &&
 781             cxgb3i_sw_tag_usable(tformat, sw_tag)) {
 782                 struct s3_conn *c3cn = cconn->cep->c3cn;
 783                 struct cxgb3i_gather_list *gl;
 784
 785                 gl = cxgb3i_ddp_make_gl(scsi_in(sc)->length,
 786                                         scsi_in(sc)->table.sgl,
 787                                         scsi_in(sc)->table.nents,
 788                                         snic->pdev,
 789                                         GFP_ATOMIC);
 790                 if (gl) {
 791                         tag = sw_tag;
 792                         err = cxgb3i_ddp_tag_reserve(snic->tdev, c3cn->tid,
 793                                                      tformat, &tag,
 794                                                      gl, GFP_ATOMIC);
 795                         if (err < 0)
 796                                 cxgb3i_ddp_release_gl(gl, snic->pdev);
 797                 }
 798         }
 799
 800         if (err < 0)
 801                 tag = cxgb3i_set_non_ddp_tag(tformat, sw_tag);
 802         /* the itt need to sent in big-endian order */
 803         *hdr_itt = (__force itt_t)htonl(tag);
 804
 805         cxgb3i_tag_debug("new tag 0x%x/0x%x (itt 0x%x, age 0x%x).\n",
 806                          tag, *hdr_itt, task->itt, sess->age);
 807         return 0;
 808 }
 809
 810 /**
 811  * cxgb3i_release_itt - release the tag for a given task
 812  * if the tag is a ddp tag, release the ddp setup
 813  * @task:       iscsi task
 814  * @hdr_itt:    tag
 815  */
 816 void cxgb3i_release_itt(struct iscsi_task *task, itt_t hdr_itt)
 817 {
 818         struct scsi_cmnd *sc = task->sc;
 819         struct iscsi_tcp_conn *tcp_conn = task->conn->dd_data;
 820         struct cxgb3i_conn *cconn = tcp_conn->dd_data;
 821         struct cxgb3i_adapter *snic = cconn->hba->snic;
 822         struct cxgb3i_tag_format *tformat = &snic->tag_format;
 823         u32 tag = ntohl((__force u32)hdr_itt);
 824
 825         cxgb3i_tag_debug("release tag 0x%x.\n", tag);
 826
 827         if (sc &&
 828             (scsi_bidi_cmnd(sc) || sc->sc_data_direction == DMA_FROM_DEVICE) &&
 829             cxgb3i_is_ddp_tag(tformat, tag))
 830                 cxgb3i_ddp_tag_release(snic->tdev, tag);
 831 }
 832
 833 /**
 834  * cxgb3i_host_template -- Scsi_Host_Template structure
 835  *      used when registering with the scsi mid layer
 836  */
 837 static struct scsi_host_template cxgb3i_host_template = {
 838         .module                 = THIS_MODULE,
 839         .name                   = "Chelsio S3xx iSCSI Initiator",
 840         .proc_name              = "cxgb3i",
 841         .queuecommand           = iscsi_queuecommand,
 842         .change_queue_depth     = iscsi_change_queue_depth,
 843         .can_queue              = CXGB3I_SCSI_QDEPTH_DFLT - 1,
 844         .sg_tablesize           = SG_ALL,
 845         .max_sectors            = 0xFFFF,
 846         .cmd_per_lun            = ISCSI_DEF_CMD_PER_LUN,
 847         .eh_abort_handler       = iscsi_eh_abort,
 848         .eh_device_reset_handler = iscsi_eh_device_reset,
 849         .eh_target_reset_handler = iscsi_eh_target_reset,
 850         .use_clustering         = DISABLE_CLUSTERING,
 851         .this_id                = -1,
 852 };
 853
 854 static struct iscsi_transport cxgb3i_iscsi_transport = {
 855         .owner                  = THIS_MODULE,
 856         .name                   = "cxgb3i",
 857         .caps                   = CAP_RECOVERY_L0 | CAP_MULTI_R2T | CAP_HDRDGST
 858                                 | CAP_DATADGST | CAP_DIGEST_OFFLOAD |
 859                                 CAP_PADDING_OFFLOAD,
 860         .param_mask             = ISCSI_MAX_RECV_DLENGTH |
 861                                 ISCSI_MAX_XMIT_DLENGTH |
 862                                 ISCSI_HDRDGST_EN |
 863                                 ISCSI_DATADGST_EN |
 864                                 ISCSI_INITIAL_R2T_EN |
 865                                 ISCSI_MAX_R2T |
 866                                 ISCSI_IMM_DATA_EN |
 867                                 ISCSI_FIRST_BURST |
 868                                 ISCSI_MAX_BURST |
 869                                 ISCSI_PDU_INORDER_EN |
 870                                 ISCSI_DATASEQ_INORDER_EN |
 871                                 ISCSI_ERL |
 872                                 ISCSI_CONN_PORT |
 873                                 ISCSI_CONN_ADDRESS |
 874                                 ISCSI_EXP_STATSN |
 875                                 ISCSI_PERSISTENT_PORT |
 876                                 ISCSI_PERSISTENT_ADDRESS |
 877                                 ISCSI_TARGET_NAME | ISCSI_TPGT |
 878                                 ISCSI_USERNAME | ISCSI_PASSWORD |
 879                                 ISCSI_USERNAME_IN | ISCSI_PASSWORD_IN |
 880                                 ISCSI_FAST_ABORT | ISCSI_ABORT_TMO |
 881                                 ISCSI_LU_RESET_TMO |
 882                                 ISCSI_PING_TMO | ISCSI_RECV_TMO |
 883                                 ISCSI_IFACE_NAME | ISCSI_INITIATOR_NAME,
 884         .host_param_mask        = ISCSI_HOST_HWADDRESS | ISCSI_HOST_IPADDRESS |
 885                         ISCSI_HOST_INITIATOR_NAME | ISCSI_HOST_NETDEV_NAME,
 886         .get_host_param         = cxgb3i_host_get_param,
 887         .set_host_param         = cxgb3i_host_set_param,
 888         /* session management */
 889         .create_session         = cxgb3i_session_create,
 890         .destroy_session        = cxgb3i_session_destroy,
 891         .get_session_param      = iscsi_session_get_param,
 892         /* connection management */
 893         .create_conn            = cxgb3i_conn_create,
 894         .bind_conn              = cxgb3i_conn_bind,
 895         .destroy_conn           = iscsi_tcp_conn_teardown,
 896         .start_conn             = iscsi_conn_start,
 897         .stop_conn              = iscsi_conn_stop,
 898         .get_conn_param         = cxgb3i_conn_get_param,
 899         .set_param              = cxgb3i_conn_set_param,
 900         .get_stats              = cxgb3i_conn_get_stats,
 901         /* pdu xmit req. from user space */
 902         .send_pdu               = iscsi_conn_send_pdu,
 903         /* task */
 904         .init_task              = iscsi_tcp_task_init,
 905         .xmit_task              = iscsi_tcp_task_xmit,
 906         .cleanup_task           = cxgb3i_conn_cleanup_task,
 907
 908         /* pdu */
 909         .alloc_pdu              = cxgb3i_conn_alloc_pdu,
 910         .init_pdu               = cxgb3i_conn_init_pdu,
 911         .xmit_pdu               = cxgb3i_conn_xmit_pdu,
 912         .parse_pdu_itt          = cxgb3i_parse_itt,
 913
 914         /* TCP connect/disconnect */
 915         .ep_connect             = cxgb3i_ep_connect,
 916         .ep_poll                = cxgb3i_ep_poll,
 917         .ep_disconnect          = cxgb3i_ep_disconnect,
 918         /* Error recovery timeout call */
 919         .session_recovery_timedout = iscsi_session_recovery_timedout,
 920 };
 921
 922 int cxgb3i_iscsi_init(void)
 923 {
 924         sw_tag_idx_bits = (__ilog2_u32(ISCSI_ITT_MASK)) + 1;
 925         sw_tag_age_bits = (__ilog2_u32(ISCSI_AGE_MASK)) + 1;
 926         cxgb3i_log_info("tag itt 0x%x, %u bits, age 0x%x, %u bits.\n",
 927                         ISCSI_ITT_MASK, sw_tag_idx_bits,
 928                         ISCSI_AGE_MASK, sw_tag_age_bits);
 929
 930         cxgb3i_scsi_transport =
 931             iscsi_register_transport(&cxgb3i_iscsi_transport);
 932         if (!cxgb3i_scsi_transport) {
 933                 cxgb3i_log_error("Could not register cxgb3i transport.\n");
 934                 return -ENODEV;
 935         }
 936         cxgb3i_api_debug("cxgb3i transport 0x%p.\n", cxgb3i_scsi_transport);
 937         return 0;
 938 }
 939
 940 void cxgb3i_iscsi_cleanup(void)
 941 {
 942         if (cxgb3i_scsi_transport) {
 943                 cxgb3i_api_debug("cxgb3i transport 0x%p.\n",
 944                                  cxgb3i_scsi_transport);
 945                 iscsi_unregister_transport(&cxgb3i_iscsi_transport);
 946         }
 947 }