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 the resources held and cleanup h/w settings
 105  * @t3dev: t3cdev adapter
 106  */
 107 void cxgb3i_adapter_remove(struct t3cdev *t3dev)
 108 {
 109         int i;
 110         struct cxgb3i_adapter *snic;
 111
 112         /* remove from the list */
 113         write_lock(&cxgb3i_snic_rwlock);
 114         list_for_each_entry(snic, &cxgb3i_snic_list, list_head) {
 115                 if (snic->tdev == t3dev) {
 116                         list_del(&snic->list_head);
 117                         break;
 118                 }
 119         }
 120         write_unlock(&cxgb3i_snic_rwlock);
 121
 122         if (snic) {
 123                 for (i = 0; i < snic->hba_cnt; i++) {
 124                         if (snic->hba[i]) {
 125                                 cxgb3i_hba_host_remove(snic->hba[i]);
 126                                 snic->hba[i] = NULL;
 127                         }
 128                 }
 129
 130                 /* release ddp resources */
 131                 cxgb3i_adapter_ddp_cleanup(snic->tdev);
 132                 kfree(snic);
 133         }
 134 }
 135
 136 /**
 137  * cxgb3i_hba_find_by_netdev - find the cxgb3i_hba structure via net_device
 138  * @t3dev: t3cdev adapter
 139  */
 140 struct cxgb3i_hba *cxgb3i_hba_find_by_netdev(struct net_device *ndev)
 141 {
 142         struct cxgb3i_adapter *snic;
 143         int i;
 144
 145         read_lock(&cxgb3i_snic_rwlock);
 146         list_for_each_entry(snic, &cxgb3i_snic_list, list_head) {
 147                 for (i = 0; i < snic->hba_cnt; i++) {
 148                         if (snic->hba[i]->ndev == ndev) {
 149                                 read_unlock(&cxgb3i_snic_rwlock);
 150                                 return snic->hba[i];
 151                         }
 152                 }
 153         }
 154         read_unlock(&cxgb3i_snic_rwlock);
 155         return NULL;
 156 }
 157
 158 /**
 159  * cxgb3i_hba_host_add - register a new host with scsi/iscsi
 160  * @snic: the cxgb3i adapter
 161  * @ndev: associated net_device
 162  */
 163 struct cxgb3i_hba *cxgb3i_hba_host_add(struct cxgb3i_adapter *snic,
 164                                        struct net_device *ndev)
 165 {
 166         struct cxgb3i_hba *hba;
 167         struct Scsi_Host *shost;
 168         int err;
 169
 170         shost = iscsi_host_alloc(&cxgb3i_host_template,
 171                                  sizeof(struct cxgb3i_hba), 1);
 172         if (!shost) {
 173                 cxgb3i_log_info("iscsi_host_alloc failed.\n");
 174                 return NULL;
 175         }
 176
 177         shost->transportt = cxgb3i_scsi_transport;
 178         shost->max_lun = CXGB3I_MAX_LUN;
 179         shost->max_id = CXGB3I_MAX_TARGET;
 180         shost->max_channel = 0;
 181         shost->max_cmd_len = 16;
 182
 183         hba = iscsi_host_priv(shost);
 184         hba->snic = snic;
 185         hba->ndev = ndev;
 186         hba->shost = shost;
 187
 188         pci_dev_get(snic->pdev);
 189         err = iscsi_host_add(shost, &snic->pdev->dev);
 190         if (err) {
 191                 cxgb3i_log_info("iscsi_host_add failed.\n");
 192                 goto pci_dev_put;
 193         }
 194
 195         cxgb3i_api_debug("shost 0x%p, hba 0x%p, no %u.\n",
 196                          shost, hba, shost->host_no);
 197
 198         return hba;
 199
 200 pci_dev_put:
 201         pci_dev_put(snic->pdev);
 202         scsi_host_put(shost);
 203         return NULL;
 204 }
 205
 206 /**
 207  * cxgb3i_hba_host_remove - de-register the host with scsi/iscsi
 208  * @hba: the cxgb3i hba
 209  */
 210 void cxgb3i_hba_host_remove(struct cxgb3i_hba *hba)
 211 {
 212         cxgb3i_api_debug("shost 0x%p, hba 0x%p, no %u.\n",
 213                          hba->shost, hba, hba->shost->host_no);
 214         iscsi_host_remove(hba->shost);
 215         pci_dev_put(hba->snic->pdev);
 216         iscsi_host_free(hba->shost);
 217 }
 218
 219 /**
 220  * cxgb3i_ep_connect - establish TCP connection to target portal
 221  * @dst_addr:           target IP address
 222  * @non_blocking:       blocking or non-blocking call
 223  *
 224  * Initiates a TCP/IP connection to the dst_addr
 225  */
 226 static struct iscsi_endpoint *cxgb3i_ep_connect(struct sockaddr *dst_addr,
 227                                                 int non_blocking)
 228 {
 229         struct iscsi_endpoint *ep;
 230         struct cxgb3i_endpoint *cep;
 231         struct cxgb3i_hba *hba;
 232         struct s3_conn *c3cn = NULL;
 233         int err = 0;
 234
 235         c3cn = cxgb3i_c3cn_create();
 236         if (!c3cn) {
 237                 cxgb3i_log_info("ep connect OOM.\n");
 238                 err = -ENOMEM;
 239                 goto release_conn;
 240         }
 241
 242         err = cxgb3i_c3cn_connect(c3cn, (struct sockaddr_in *)dst_addr);
 243         if (err < 0) {
 244                 cxgb3i_log_info("ep connect failed.\n");
 245                 goto release_conn;
 246         }
 247         hba = cxgb3i_hba_find_by_netdev(c3cn->dst_cache->dev);
 248         if (!hba) {
 249                 err = -ENOSPC;
 250                 cxgb3i_log_info("NOT going through cxgbi device.\n");
 251                 goto release_conn;
 252         }
 253         if (c3cn_is_closing(c3cn)) {
 254                 err = -ENOSPC;
 255                 cxgb3i_log_info("ep connect unable to connect.\n");
 256                 goto release_conn;
 257         }
 258
 259         ep = iscsi_create_endpoint(sizeof(*cep));
 260         if (!ep) {
 261                 err = -ENOMEM;
 262                 cxgb3i_log_info("iscsi alloc ep, OOM.\n");
 263                 goto release_conn;
 264         }
 265         cep = ep->dd_data;
 266         cep->c3cn = c3cn;
 267         cep->hba = hba;
 268
 269         cxgb3i_api_debug("ep 0x%p, 0x%p, c3cn 0x%p, hba 0x%p.\n",
 270                           ep, cep, c3cn, hba);
 271         return ep;
 272
 273 release_conn:
 274         cxgb3i_api_debug("conn 0x%p failed, release.\n", c3cn);
 275         if (c3cn)
 276                 cxgb3i_c3cn_release(c3cn);
 277         return ERR_PTR(err);
 278 }
 279
 280 /**
 281  * cxgb3i_ep_poll - polls for TCP connection establishement
 282  * @ep:         TCP connection (endpoint) handle
 283  * @timeout_ms: timeout value in milli secs
 284  *
 285  * polls for TCP connect request to complete
 286  */
 287 static int cxgb3i_ep_poll(struct iscsi_endpoint *ep, int timeout_ms)
 288 {
 289         struct cxgb3i_endpoint *cep = ep->dd_data;
 290         struct s3_conn *c3cn = cep->c3cn;
 291
 292         if (!c3cn_is_established(c3cn))
 293                 return 0;
 294         cxgb3i_api_debug("ep 0x%p, c3cn 0x%p established.\n", ep, c3cn);
 295         return 1;
 296 }
 297
 298 /**
 299  * cxgb3i_ep_disconnect - teardown TCP connection
 300  * @ep:         TCP connection (endpoint) handle
 301  *
 302  * teardown TCP connection
 303  */
 304 static void cxgb3i_ep_disconnect(struct iscsi_endpoint *ep)
 305 {
 306         struct cxgb3i_endpoint *cep = ep->dd_data;
 307         struct cxgb3i_conn *cconn = cep->cconn;
 308
 309         cxgb3i_api_debug("ep 0x%p, cep 0x%p.\n", ep, cep);
 310
 311         if (cconn && cconn->conn) {
 312                 /*
 313                  * stop the xmit path so the xmit_pdu function is
 314                  * not being called
 315                  */
 316                 iscsi_suspend_tx(cconn->conn);
 317
 318                 write_lock_bh(&cep->c3cn->callback_lock);
 319                 cep->c3cn->user_data = NULL;
 320                 cconn->cep = NULL;
 321                 write_unlock_bh(&cep->c3cn->callback_lock);
 322         }
 323
 324         cxgb3i_api_debug("ep 0x%p, cep 0x%p, release c3cn 0x%p.\n",
 325                          ep, cep, cep->c3cn);
 326         cxgb3i_c3cn_release(cep->c3cn);
 327         iscsi_destroy_endpoint(ep);
 328 }
 329
 330 /**
 331  * cxgb3i_session_create - create a new iscsi session
 332  * @cmds_max:           max # of commands
 333  * @qdepth:             scsi queue depth
 334  * @initial_cmdsn:      initial iscsi CMDSN for this session
 335  *
 336  * Creates a new iSCSI session
 337  */
 338 static struct iscsi_cls_session *
 339 cxgb3i_session_create(struct iscsi_endpoint *ep, u16 cmds_max, u16 qdepth,
 340                       u32 initial_cmdsn)
 341 {
 342         struct cxgb3i_endpoint *cep;
 343         struct cxgb3i_hba *hba;
 344         struct Scsi_Host *shost;
 345         struct iscsi_cls_session *cls_session;
 346         struct iscsi_session *session;
 347
 348         if (!ep) {
 349                 cxgb3i_log_error("%s, missing endpoint.\n", __func__);
 350                 return NULL;
 351         }
 352
 353         cep = ep->dd_data;
 354         hba = cep->hba;
 355         shost = hba->shost;
 356         cxgb3i_api_debug("ep 0x%p, cep 0x%p, hba 0x%p.\n", ep, cep, hba);
 357         BUG_ON(hba != iscsi_host_priv(shost));
 358
 359         cls_session = iscsi_session_setup(&cxgb3i_iscsi_transport, shost,
 360                                           cmds_max,
 361                                           sizeof(struct iscsi_tcp_task) +
 362                                           sizeof(struct cxgb3i_task_data),
 363                                           initial_cmdsn, ISCSI_MAX_TARGET);
 364         if (!cls_session)
 365                 return NULL;
 366         session = cls_session->dd_data;
 367         if (iscsi_tcp_r2tpool_alloc(session))
 368                 goto remove_session;
 369
 370         return cls_session;
 371
 372 remove_session:
 373         iscsi_session_teardown(cls_session);
 374         return NULL;
 375 }
 376
 377 /**
 378  * cxgb3i_session_destroy - destroys iscsi session
 379  * @cls_session:        pointer to iscsi cls session
 380  *
 381  * Destroys an iSCSI session instance and releases its all resources held
 382  */
 383 static void cxgb3i_session_destroy(struct iscsi_cls_session *cls_session)
 384 {
 385         cxgb3i_api_debug("sess 0x%p.\n", cls_session);
 386         iscsi_tcp_r2tpool_free(cls_session->dd_data);
 387         iscsi_session_teardown(cls_session);
 388 }
 389
 390 /**
 391  * cxgb3i_conn_max_xmit_dlength -- calc the max. xmit pdu segment size
 392  * @conn: iscsi connection
 393  * check the max. xmit pdu payload, reduce it if needed
 394  */
 395 static inline int cxgb3i_conn_max_xmit_dlength(struct iscsi_conn *conn)
 396
 397 {
 398         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
 399         struct cxgb3i_conn *cconn = tcp_conn->dd_data;
 400         unsigned int max = max(512 * MAX_SKB_FRAGS, SKB_TX_HEADROOM);
 401
 402         max = min(cconn->hba->snic->tx_max_size, max);
 403         if (conn->max_xmit_dlength)
 404                 conn->max_xmit_dlength = min(conn->max_xmit_dlength, max);
 405         else
 406                 conn->max_xmit_dlength = max;
 407         align_pdu_size(conn->max_xmit_dlength);
 408         cxgb3i_api_debug("conn 0x%p, max xmit %u.\n",
 409                          conn, conn->max_xmit_dlength);
 410         return 0;
 411 }
 412
 413 /**
 414  * cxgb3i_conn_max_recv_dlength -- check the max. recv pdu segment size
 415  * @conn: iscsi connection
 416  * return 0 if the value is valid, < 0 otherwise.
 417  */
 418 static inline int cxgb3i_conn_max_recv_dlength(struct iscsi_conn *conn)
 419 {
 420         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
 421         struct cxgb3i_conn *cconn = tcp_conn->dd_data;
 422         unsigned int max = cconn->hba->snic->rx_max_size;
 423
 424         align_pdu_size(max);
 425         if (conn->max_recv_dlength) {
 426                 if (conn->max_recv_dlength > max) {
 427                         cxgb3i_log_error("MaxRecvDataSegmentLength %u too big."
 428                                          " Need to be <= %u.\n",
 429                                          conn->max_recv_dlength, max);
 430                         return -EINVAL;
 431                 }
 432                 conn->max_recv_dlength = min(conn->max_recv_dlength, max);
 433                 align_pdu_size(conn->max_recv_dlength);
 434         } else
 435                 conn->max_recv_dlength = max;
 436         cxgb3i_api_debug("conn 0x%p, max recv %u.\n",
 437                          conn, conn->max_recv_dlength);
 438         return 0;
 439 }
 440
 441 /**
 442  * cxgb3i_conn_create - create iscsi connection instance
 443  * @cls_session:        pointer to iscsi cls session
 444  * @cid:                iscsi cid
 445  *
 446  * Creates a new iSCSI connection instance for a given session
 447  */
 448 static struct iscsi_cls_conn *cxgb3i_conn_create(struct iscsi_cls_session
 449                                                  *cls_session, u32 cid)
 450 {
 451         struct iscsi_cls_conn *cls_conn;
 452         struct iscsi_conn *conn;
 453         struct iscsi_tcp_conn *tcp_conn;
 454         struct cxgb3i_conn *cconn;
 455
 456         cxgb3i_api_debug("sess 0x%p, cid %u.\n", cls_session, cid);
 457
 458         cls_conn = iscsi_tcp_conn_setup(cls_session, sizeof(*cconn), cid);
 459         if (!cls_conn)
 460                 return NULL;
 461         conn = cls_conn->dd_data;
 462         tcp_conn = conn->dd_data;
 463         cconn = tcp_conn->dd_data;
 464
 465         cconn->conn = conn;
 466         return cls_conn;
 467 }
 468
 469 /**
 470  * cxgb3i_conn_bind - binds iscsi sess, conn and endpoint together
 471  * @cls_session:        pointer to iscsi cls session
 472  * @cls_conn:           pointer to iscsi cls conn
 473  * @transport_eph:      64-bit EP handle
 474  * @is_leading:         leading connection on this session?
 475  *
 476  * Binds together an iSCSI session, an iSCSI connection and a
 477  *      TCP connection. This routine returns error code if the TCP
 478  *      connection does not belong on the device iSCSI sess/conn is bound
 479  */
 480
 481 static int cxgb3i_conn_bind(struct iscsi_cls_session *cls_session,
 482                             struct iscsi_cls_conn *cls_conn,
 483                             u64 transport_eph, int is_leading)
 484 {
 485         struct iscsi_conn *conn = cls_conn->dd_data;
 486         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
 487         struct cxgb3i_conn *cconn = tcp_conn->dd_data;
 488         struct cxgb3i_adapter *snic;
 489         struct iscsi_endpoint *ep;
 490         struct cxgb3i_endpoint *cep;
 491         struct s3_conn *c3cn;
 492         int err;
 493
 494         ep = iscsi_lookup_endpoint(transport_eph);
 495         if (!ep)
 496                 return -EINVAL;
 497
 498         /* setup ddp pagesize */
 499         cep = ep->dd_data;
 500         c3cn = cep->c3cn;
 501         snic = cep->hba->snic;
 502         err = cxgb3i_setup_conn_host_pagesize(snic->tdev, c3cn->tid, 0);
 503         if (err < 0)
 504                 return err;
 505
 506         cxgb3i_api_debug("ep 0x%p, cls sess 0x%p, cls conn 0x%p.\n",
 507                          ep, cls_session, cls_conn);
 508
 509         err = iscsi_conn_bind(cls_session, cls_conn, is_leading);
 510         if (err)
 511                 return -EINVAL;
 512
 513         /* calculate the tag idx bits needed for this conn based on cmds_max */
 514         cconn->task_idx_bits = (__ilog2_u32(conn->session->cmds_max - 1)) + 1;
 515         cxgb3i_api_debug("session cmds_max 0x%x, bits %u.\n",
 516                          conn->session->cmds_max, cconn->task_idx_bits);
 517
 518         read_lock(&c3cn->callback_lock);
 519         c3cn->user_data = conn;
 520         cconn->hba = cep->hba;
 521         cconn->cep = cep;
 522         cep->cconn = cconn;
 523         read_unlock(&c3cn->callback_lock);
 524
 525         cxgb3i_conn_max_xmit_dlength(conn);
 526         cxgb3i_conn_max_recv_dlength(conn);
 527
 528         spin_lock_bh(&conn->session->lock);
 529         sprintf(conn->portal_address, NIPQUAD_FMT,
 530                 NIPQUAD(c3cn->daddr.sin_addr.s_addr));
 531         conn->portal_port = ntohs(c3cn->daddr.sin_port);
 532         spin_unlock_bh(&conn->session->lock);
 533
 534         /* init recv engine */
 535         iscsi_tcp_hdr_recv_prep(tcp_conn);
 536
 537         return 0;
 538 }
 539
 540 /**
 541  * cxgb3i_conn_get_param - return iscsi connection parameter to caller
 542  * @cls_conn:   pointer to iscsi cls conn
 543  * @param:      parameter type identifier
 544  * @buf:        buffer pointer
 545  *
 546  * returns iSCSI connection parameters
 547  */
 548 static int cxgb3i_conn_get_param(struct iscsi_cls_conn *cls_conn,
 549                                  enum iscsi_param param, char *buf)
 550 {
 551         struct iscsi_conn *conn = cls_conn->dd_data;
 552         int len;
 553
 554         cxgb3i_api_debug("cls_conn 0x%p, param %d.\n", cls_conn, param);
 555
 556         switch (param) {
 557         case ISCSI_PARAM_CONN_PORT:
 558                 spin_lock_bh(&conn->session->lock);
 559                 len = sprintf(buf, "%hu\n", conn->portal_port);
 560                 spin_unlock_bh(&conn->session->lock);
 561                 break;
 562         case ISCSI_PARAM_CONN_ADDRESS:
 563                 spin_lock_bh(&conn->session->lock);
 564                 len = sprintf(buf, "%s\n", conn->portal_address);
 565                 spin_unlock_bh(&conn->session->lock);
 566                 break;
 567         default:
 568                 return iscsi_conn_get_param(cls_conn, param, buf);
 569         }
 570
 571         return len;
 572 }
 573
 574 /**
 575  * cxgb3i_conn_set_param - set iscsi connection parameter
 576  * @cls_conn:   pointer to iscsi cls conn
 577  * @param:      parameter type identifier
 578  * @buf:        buffer pointer
 579  * @buflen:     buffer length
 580  *
 581  * set iSCSI connection parameters
 582  */
 583 static int cxgb3i_conn_set_param(struct iscsi_cls_conn *cls_conn,
 584                                  enum iscsi_param param, char *buf, int buflen)
 585 {
 586         struct iscsi_conn *conn = cls_conn->dd_data;
 587         struct iscsi_session *session = conn->session;
 588         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
 589         struct cxgb3i_conn *cconn = tcp_conn->dd_data;
 590         struct cxgb3i_adapter *snic = cconn->hba->snic;
 591         struct s3_conn *c3cn = cconn->cep->c3cn;
 592         int value, err = 0;
 593
 594         switch (param) {
 595         case ISCSI_PARAM_HDRDGST_EN:
 596                 err = iscsi_set_param(cls_conn, param, buf, buflen);
 597                 if (!err && conn->hdrdgst_en)
 598                         err = cxgb3i_setup_conn_digest(snic->tdev, c3cn->tid,
 599                                                         conn->hdrdgst_en,
 600                                                         conn->datadgst_en, 0);
 601                 break;
 602         case ISCSI_PARAM_DATADGST_EN:
 603                 err = iscsi_set_param(cls_conn, param, buf, buflen);
 604                 if (!err && conn->datadgst_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_MAX_R2T:
 610                 sscanf(buf, "%d", &value);
 611                 if (value <= 0 || !is_power_of_2(value))
 612                         return -EINVAL;
 613                 if (session->max_r2t == value)
 614                         break;
 615                 iscsi_tcp_r2tpool_free(session);
 616                 err = iscsi_set_param(cls_conn, param, buf, buflen);
 617                 if (!err && iscsi_tcp_r2tpool_alloc(session))
 618                         return -ENOMEM;
 619         case ISCSI_PARAM_MAX_RECV_DLENGTH:
 620                 err = iscsi_set_param(cls_conn, param, buf, buflen);
 621                 if (!err)
 622                         err = cxgb3i_conn_max_recv_dlength(conn);
 623                 break;
 624         case ISCSI_PARAM_MAX_XMIT_DLENGTH:
 625                 err = iscsi_set_param(cls_conn, param, buf, buflen);
 626                 if (!err)
 627                         err = cxgb3i_conn_max_xmit_dlength(conn);
 628                 break;
 629         default:
 630                 return iscsi_set_param(cls_conn, param, buf, buflen);
 631         }
 632         return err;
 633 }
 634
 635 /**
 636  * cxgb3i_host_set_param - configure host (adapter) related parameters
 637  * @shost:      scsi host pointer
 638  * @param:      parameter type identifier
 639  * @buf:        buffer pointer
 640  */
 641 static int cxgb3i_host_set_param(struct Scsi_Host *shost,
 642                                  enum iscsi_host_param param,
 643                                  char *buf, int buflen)
 644 {
 645         struct cxgb3i_hba *hba = iscsi_host_priv(shost);
 646
 647         cxgb3i_api_debug("param %d, buf %s.\n", param, buf);
 648
 649         switch (param) {
 650         case ISCSI_HOST_PARAM_IPADDRESS:
 651         {
 652                 __be32 addr = in_aton(buf);
 653                 cxgb3i_set_private_ipv4addr(hba->ndev, addr);
 654                 return 0;
 655         }
 656         case ISCSI_HOST_PARAM_HWADDRESS:
 657         case ISCSI_HOST_PARAM_NETDEV_NAME:
 658                 /* ignore */
 659                 return 0;
 660         default:
 661                 return iscsi_host_set_param(shost, param, buf, buflen);
 662         }
 663 }
 664
 665 /**
 666  * cxgb3i_host_get_param - returns host (adapter) related parameters
 667  * @shost:      scsi host pointer
 668  * @param:      parameter type identifier
 669  * @buf:        buffer pointer
 670  */
 671 static int cxgb3i_host_get_param(struct Scsi_Host *shost,
 672                                  enum iscsi_host_param param, char *buf)
 673 {
 674         struct cxgb3i_hba *hba = iscsi_host_priv(shost);
 675         int len = 0;
 676
 677         cxgb3i_api_debug("hba %s, param %d.\n", hba->ndev->name, param);
 678
 679         switch (param) {
 680         case ISCSI_HOST_PARAM_HWADDRESS:
 681                 len = sysfs_format_mac(buf, hba->ndev->dev_addr, 6);
 682                 break;
 683         case ISCSI_HOST_PARAM_NETDEV_NAME:
 684                 len = sprintf(buf, "%s\n", hba->ndev->name);
 685                 break;
 686         case ISCSI_HOST_PARAM_IPADDRESS:
 687         {
 688                 __be32 addr;
 689
 690                 addr = cxgb3i_get_private_ipv4addr(hba->ndev);
 691                 len = sprintf(buf, NIPQUAD_FMT, NIPQUAD(addr));
 692                 break;
 693         }
 694         default:
 695                 return iscsi_host_get_param(shost, param, buf);
 696         }
 697         return len;
 698 }
 699
 700 /**
 701  * cxgb3i_conn_get_stats - returns iSCSI stats
 702  * @cls_conn:   pointer to iscsi cls conn
 703  * @stats:      pointer to iscsi statistic struct
 704  */
 705 static void cxgb3i_conn_get_stats(struct iscsi_cls_conn *cls_conn,
 706                                   struct iscsi_stats *stats)
 707 {
 708         struct iscsi_conn *conn = cls_conn->dd_data;
 709
 710         stats->txdata_octets = conn->txdata_octets;
 711         stats->rxdata_octets = conn->rxdata_octets;
 712         stats->scsicmd_pdus = conn->scsicmd_pdus_cnt;
 713         stats->dataout_pdus = conn->dataout_pdus_cnt;
 714         stats->scsirsp_pdus = conn->scsirsp_pdus_cnt;
 715         stats->datain_pdus = conn->datain_pdus_cnt;
 716         stats->r2t_pdus = conn->r2t_pdus_cnt;
 717         stats->tmfcmd_pdus = conn->tmfcmd_pdus_cnt;
 718         stats->tmfrsp_pdus = conn->tmfrsp_pdus_cnt;
 719         stats->digest_err = 0;
 720         stats->timeout_err = 0;
 721         stats->custom_length = 1;
 722         strcpy(stats->custom[0].desc, "eh_abort_cnt");
 723         stats->custom[0].value = conn->eh_abort_cnt;
 724 }
 725
 726 /**
 727  * cxgb3i_parse_itt - get the idx and age bits from a given tag
 728  * @conn:       iscsi connection
 729  * @itt:        itt tag
 730  * @idx:        task index, filled in by this function
 731  * @age:        session age, filled in by this function
 732  */
 733 static void cxgb3i_parse_itt(struct iscsi_conn *conn, itt_t itt,
 734                              int *idx, int *age)
 735 {
 736         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
 737         struct cxgb3i_conn *cconn = tcp_conn->dd_data;
 738         struct cxgb3i_adapter *snic = cconn->hba->snic;
 739         u32 tag = ntohl((__force u32) itt);
 740         u32 sw_bits;
 741
 742         sw_bits = cxgb3i_tag_nonrsvd_bits(&snic->tag_format, tag);
 743         if (idx)
 744                 *idx = sw_bits & ((1 << cconn->task_idx_bits) - 1);
 745         if (age)
 746                 *age = (sw_bits >> cconn->task_idx_bits) & ISCSI_AGE_MASK;
 747
 748         cxgb3i_tag_debug("parse tag 0x%x/0x%x, sw 0x%x, itt 0x%x, age 0x%x.\n",
 749                          tag, itt, sw_bits, idx ? *idx : 0xFFFFF,
 750                          age ? *age : 0xFF);
 751 }
 752
 753 /**
 754  * cxgb3i_reserve_itt - generate tag for a give task
 755  * @task: iscsi task
 756  * @hdr_itt: tag, filled in by this function
 757  * Set up ddp for scsi read tasks if possible.
 758  */
 759 int cxgb3i_reserve_itt(struct iscsi_task *task, itt_t *hdr_itt)
 760 {
 761         struct scsi_cmnd *sc = task->sc;
 762         struct iscsi_conn *conn = task->conn;
 763         struct iscsi_session *sess = conn->session;
 764         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
 765         struct cxgb3i_conn *cconn = tcp_conn->dd_data;
 766         struct cxgb3i_adapter *snic = cconn->hba->snic;
 767         struct cxgb3i_tag_format *tformat = &snic->tag_format;
 768         u32 sw_tag = (sess->age << cconn->task_idx_bits) | task->itt;
 769         u32 tag;
 770         int err = -EINVAL;
 771
 772         if (sc &&
 773             (scsi_bidi_cmnd(sc) || sc->sc_data_direction == DMA_FROM_DEVICE) &&
 774             cxgb3i_sw_tag_usable(tformat, sw_tag)) {
 775                 struct s3_conn *c3cn = cconn->cep->c3cn;
 776                 struct cxgb3i_gather_list *gl;
 777
 778                 gl = cxgb3i_ddp_make_gl(scsi_in(sc)->length,
 779                                         scsi_in(sc)->table.sgl,
 780                                         scsi_in(sc)->table.nents,
 781                                         snic->pdev,
 782                                         GFP_ATOMIC);
 783                 if (gl) {
 784                         tag = sw_tag;
 785                         err = cxgb3i_ddp_tag_reserve(snic->tdev, c3cn->tid,
 786                                                      tformat, &tag,
 787                                                      gl, GFP_ATOMIC);
 788                         if (err < 0)
 789                                 cxgb3i_ddp_release_gl(gl, snic->pdev);
 790                 }
 791         }
 792
 793         if (err < 0)
 794                 tag = cxgb3i_set_non_ddp_tag(tformat, sw_tag);
 795         /* the itt need to sent in big-endian order */
 796         *hdr_itt = (__force itt_t)htonl(tag);
 797
 798         cxgb3i_tag_debug("new tag 0x%x/0x%x (itt 0x%x, age 0x%x).\n",
 799                          tag, *hdr_itt, task->itt, sess->age);
 800         return 0;
 801 }
 802
 803 /**
 804  * cxgb3i_release_itt - release the tag for a given task
 805  * @task:       iscsi task
 806  * @hdr_itt:    tag
 807  * If the tag is a ddp tag, release the ddp setup
 808  */
 809 void cxgb3i_release_itt(struct iscsi_task *task, itt_t hdr_itt)
 810 {
 811         struct scsi_cmnd *sc = task->sc;
 812         struct iscsi_tcp_conn *tcp_conn = task->conn->dd_data;
 813         struct cxgb3i_conn *cconn = tcp_conn->dd_data;
 814         struct cxgb3i_adapter *snic = cconn->hba->snic;
 815         struct cxgb3i_tag_format *tformat = &snic->tag_format;
 816         u32 tag = ntohl((__force u32)hdr_itt);
 817
 818         cxgb3i_tag_debug("release tag 0x%x.\n", tag);
 819
 820         if (sc &&
 821             (scsi_bidi_cmnd(sc) || sc->sc_data_direction == DMA_FROM_DEVICE) &&
 822             cxgb3i_is_ddp_tag(tformat, tag))
 823                 cxgb3i_ddp_tag_release(snic->tdev, tag);
 824 }
 825
 826 /**
 827  * cxgb3i_host_template -- Scsi_Host_Template structure
 828  *      used when registering with the scsi mid layer
 829  */
 830 static struct scsi_host_template cxgb3i_host_template = {
 831         .module                 = THIS_MODULE,
 832         .name                   = "Chelsio S3xx iSCSI Initiator",
 833         .proc_name              = "cxgb3i",
 834         .queuecommand           = iscsi_queuecommand,
 835         .change_queue_depth     = iscsi_change_queue_depth,
 836         .can_queue              = CXGB3I_SCSI_QDEPTH_DFLT - 1,
 837         .sg_tablesize           = SG_ALL,
 838         .max_sectors            = 0xFFFF,
 839         .cmd_per_lun            = CXGB3I_SCSI_QDEPTH_DFLT,
 840         .eh_abort_handler       = iscsi_eh_abort,
 841         .eh_device_reset_handler = iscsi_eh_device_reset,
 842         .eh_target_reset_handler = iscsi_eh_target_reset,
 843         .use_clustering         = DISABLE_CLUSTERING,
 844         .this_id                = -1,
 845 };
 846
 847 static struct iscsi_transport cxgb3i_iscsi_transport = {
 848         .owner                  = THIS_MODULE,
 849         .name                   = "cxgb3i",
 850         .caps                   = CAP_RECOVERY_L0 | CAP_MULTI_R2T | CAP_HDRDGST
 851                                 | CAP_DATADGST | CAP_DIGEST_OFFLOAD |
 852                                 CAP_PADDING_OFFLOAD,
 853         .param_mask             = ISCSI_MAX_RECV_DLENGTH |
 854                                 ISCSI_MAX_XMIT_DLENGTH |
 855                                 ISCSI_HDRDGST_EN |
 856                                 ISCSI_DATADGST_EN |
 857                                 ISCSI_INITIAL_R2T_EN |
 858                                 ISCSI_MAX_R2T |
 859                                 ISCSI_IMM_DATA_EN |
 860                                 ISCSI_FIRST_BURST |
 861                                 ISCSI_MAX_BURST |
 862                                 ISCSI_PDU_INORDER_EN |
 863                                 ISCSI_DATASEQ_INORDER_EN |
 864                                 ISCSI_ERL |
 865                                 ISCSI_CONN_PORT |
 866                                 ISCSI_CONN_ADDRESS |
 867                                 ISCSI_EXP_STATSN |
 868                                 ISCSI_PERSISTENT_PORT |
 869                                 ISCSI_PERSISTENT_ADDRESS |
 870                                 ISCSI_TARGET_NAME | ISCSI_TPGT |
 871                                 ISCSI_USERNAME | ISCSI_PASSWORD |
 872                                 ISCSI_USERNAME_IN | ISCSI_PASSWORD_IN |
 873                                 ISCSI_FAST_ABORT | ISCSI_ABORT_TMO |
 874                                 ISCSI_LU_RESET_TMO |
 875                                 ISCSI_PING_TMO | ISCSI_RECV_TMO |
 876                                 ISCSI_IFACE_NAME | ISCSI_INITIATOR_NAME,
 877         .host_param_mask        = ISCSI_HOST_HWADDRESS | ISCSI_HOST_IPADDRESS |
 878                         ISCSI_HOST_INITIATOR_NAME | ISCSI_HOST_NETDEV_NAME,
 879         .get_host_param         = cxgb3i_host_get_param,
 880         .set_host_param         = cxgb3i_host_set_param,
 881         /* session management */
 882         .create_session         = cxgb3i_session_create,
 883         .destroy_session        = cxgb3i_session_destroy,
 884         .get_session_param      = iscsi_session_get_param,
 885         /* connection management */
 886         .create_conn            = cxgb3i_conn_create,
 887         .bind_conn              = cxgb3i_conn_bind,
 888         .destroy_conn           = iscsi_tcp_conn_teardown,
 889         .start_conn             = iscsi_conn_start,
 890         .stop_conn              = iscsi_conn_stop,
 891         .get_conn_param         = cxgb3i_conn_get_param,
 892         .set_param              = cxgb3i_conn_set_param,
 893         .get_stats              = cxgb3i_conn_get_stats,
 894         /* pdu xmit req. from user space */
 895         .send_pdu               = iscsi_conn_send_pdu,
 896         /* task */
 897         .init_task              = iscsi_tcp_task_init,
 898         .xmit_task              = iscsi_tcp_task_xmit,
 899         .cleanup_task           = cxgb3i_conn_cleanup_task,
 900
 901         /* pdu */
 902         .alloc_pdu              = cxgb3i_conn_alloc_pdu,
 903         .init_pdu               = cxgb3i_conn_init_pdu,
 904         .xmit_pdu               = cxgb3i_conn_xmit_pdu,
 905         .parse_pdu_itt          = cxgb3i_parse_itt,
 906
 907         /* TCP connect/disconnect */
 908         .ep_connect             = cxgb3i_ep_connect,
 909         .ep_poll                = cxgb3i_ep_poll,
 910         .ep_disconnect          = cxgb3i_ep_disconnect,
 911         /* Error recovery timeout call */
 912         .session_recovery_timedout = iscsi_session_recovery_timedout,
 913 };
 914
 915 int cxgb3i_iscsi_init(void)
 916 {
 917         sw_tag_idx_bits = (__ilog2_u32(ISCSI_ITT_MASK)) + 1;
 918         sw_tag_age_bits = (__ilog2_u32(ISCSI_AGE_MASK)) + 1;
 919         cxgb3i_log_info("tag itt 0x%x, %u bits, age 0x%x, %u bits.\n",
 920                         ISCSI_ITT_MASK, sw_tag_idx_bits,
 921                         ISCSI_AGE_MASK, sw_tag_age_bits);
 922
 923         cxgb3i_scsi_transport =
 924             iscsi_register_transport(&cxgb3i_iscsi_transport);
 925         if (!cxgb3i_scsi_transport) {
 926                 cxgb3i_log_error("Could not register cxgb3i transport.\n");
 927                 return -ENODEV;
 928         }
 929         cxgb3i_api_debug("cxgb3i transport 0x%p.\n", cxgb3i_scsi_transport);
 930         return 0;
 931 }
 932
 933 void cxgb3i_iscsi_cleanup(void)
 934 {
 935         if (cxgb3i_scsi_transport) {
 936                 cxgb3i_api_debug("cxgb3i transport 0x%p.\n",
 937                                  cxgb3i_scsi_transport);
 938                 iscsi_unregister_transport(&cxgb3i_iscsi_transport);
 939         }
 940 }