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