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/dst.h>
  17 #include <net/tcp.h>
  18 #include <scsi/scsi_cmnd.h>
  19 #include <scsi/scsi_device.h>
  20 #include <scsi/scsi_eh.h>
  21 #include <scsi/scsi_host.h>
  22 #include <scsi/scsi.h>
  23 #include <scsi/iscsi_proto.h>
  24 #include <scsi/libiscsi.h>
  25 #include <scsi/scsi_transport_iscsi.h>
  26
  27 #include "cxgb3i.h"
  28 #include "cxgb3i_pdu.h"
  29
  30 #ifdef __DEBUG_CXGB3I_TAG__
  31 #define cxgb3i_tag_debug        cxgb3i_log_debug
  32 #else
  33 #define cxgb3i_tag_debug(fmt...)
  34 #endif
  35
  36 #ifdef __DEBUG_CXGB3I_API__
  37 #define cxgb3i_api_debug        cxgb3i_log_debug
  38 #else
  39 #define cxgb3i_api_debug(fmt...)
  40 #endif
  41
  42 /*
  43  * align pdu size to multiple of 512 for better performance
  44  */
  45 #define align_pdu_size(n) do { n = (n) & (~511); } while (0)
  46
  47 static struct scsi_transport_template *cxgb3i_scsi_transport;
  48 static struct scsi_host_template cxgb3i_host_template;
  49 static struct iscsi_transport cxgb3i_iscsi_transport;
  50 static unsigned char sw_tag_idx_bits;
  51 static unsigned char sw_tag_age_bits;
  52
  53 static LIST_HEAD(cxgb3i_snic_list);
  54 static DEFINE_RWLOCK(cxgb3i_snic_rwlock);
  55
  56 /**
  57  * cxgb3i_adpater_find_by_tdev - find the cxgb3i_adapter structure via t3cdev
  58  * @tdev: t3cdev pointer
  59  */
  60 struct cxgb3i_adapter *cxgb3i_adapter_find_by_tdev(struct t3cdev *tdev)
  61 {
  62         struct cxgb3i_adapter *snic;
  63
  64         read_lock(&cxgb3i_snic_rwlock);
  65         list_for_each_entry(snic, &cxgb3i_snic_list, list_head) {
  66                 if (snic->tdev == tdev) {
  67                         read_unlock(&cxgb3i_snic_rwlock);
  68                         return snic;
  69                 }
  70         }
  71         read_unlock(&cxgb3i_snic_rwlock);
  72         return NULL;
  73 }
  74
  75 static inline int adapter_update(struct cxgb3i_adapter *snic)
  76 {
  77         cxgb3i_log_info("snic 0x%p, t3dev 0x%p, updating.\n",
  78                         snic, snic->tdev);
  79         return cxgb3i_adapter_ddp_info(snic->tdev, &snic->tag_format,
  80                                         &snic->tx_max_size,
  81                                         &snic->rx_max_size);
  82 }
  83
  84 static int adapter_add(struct cxgb3i_adapter *snic)
  85 {
  86         struct t3cdev *t3dev = snic->tdev;
  87         struct adapter *adapter = tdev2adap(t3dev);
  88         int i, err;
  89
  90         snic->pdev = adapter->pdev;
  91         snic->tag_format.sw_bits = sw_tag_idx_bits + sw_tag_age_bits;
  92
  93         err = cxgb3i_adapter_ddp_info(t3dev, &snic->tag_format,
  94                                     &snic->tx_max_size,
  95                                     &snic->rx_max_size);
  96         if (err < 0)
  97                 return err;
  98
  99         for_each_port(adapter, i) {
 100                 snic->hba[i] = cxgb3i_hba_host_add(snic, adapter->port[i]);
 101                 if (!snic->hba[i])
 102                         return -EINVAL;
 103         }
 104         snic->hba_cnt = adapter->params.nports;
 105
 106         /* add to the list */
 107         write_lock(&cxgb3i_snic_rwlock);
 108         list_add_tail(&snic->list_head, &cxgb3i_snic_list);
 109         write_unlock(&cxgb3i_snic_rwlock);
 110
 111         cxgb3i_log_info("t3dev 0x%p open, snic 0x%p, %u scsi hosts added.\n",
 112                         t3dev, snic, snic->hba_cnt);
 113         return 0;
 114 }
 115
 116 /**
 117  * cxgb3i_adapter_open - init a s3 adapter structure and any h/w settings
 118  * @t3dev: t3cdev adapter
 119  */
 120 void cxgb3i_adapter_open(struct t3cdev *t3dev)
 121 {
 122         struct cxgb3i_adapter *snic = cxgb3i_adapter_find_by_tdev(t3dev);
 123         int err;
 124
 125         if (snic)
 126                 err = adapter_update(snic);
 127         else {
 128                 snic = kzalloc(sizeof(*snic), GFP_KERNEL);
 129                 if (snic) {
 130                         spin_lock_init(&snic->lock);
 131                         snic->tdev = t3dev;
 132                         err = adapter_add(snic);
 133                 } else
 134                         err = -ENOMEM;
 135         }
 136
 137         if (err < 0) {
 138                 cxgb3i_log_info("snic 0x%p, f 0x%x, t3dev 0x%p open, err %d.\n",
 139                                 snic, snic ? snic->flags : 0, t3dev, err);
 140                 if (snic) {
 141                         snic->flags &= ~CXGB3I_ADAPTER_FLAG_RESET;
 142                         cxgb3i_adapter_close(t3dev);
 143                 }
 144         }
 145 }
 146
 147 /**
 148  * cxgb3i_adapter_close - release the resources held and cleanup h/w settings
 149  * @t3dev: t3cdev adapter
 150  */
 151 void cxgb3i_adapter_close(struct t3cdev *t3dev)
 152 {
 153         struct cxgb3i_adapter *snic = cxgb3i_adapter_find_by_tdev(t3dev);
 154         int i;
 155
 156         if (!snic || snic->flags & CXGB3I_ADAPTER_FLAG_RESET) {
 157                 cxgb3i_log_info("t3dev 0x%p close, snic 0x%p, f 0x%x.\n",
 158                                 t3dev, snic, snic ? snic->flags : 0);
 159                 return;
 160         }
 161
 162         /* remove from the list */
 163         write_lock(&cxgb3i_snic_rwlock);
 164         list_del(&snic->list_head);
 165         write_unlock(&cxgb3i_snic_rwlock);
 166
 167         for (i = 0; i < snic->hba_cnt; i++) {
 168                 if (snic->hba[i]) {
 169                         cxgb3i_hba_host_remove(snic->hba[i]);
 170                         snic->hba[i] = NULL;
 171                 }
 172         }
 173         cxgb3i_log_info("t3dev 0x%p close, snic 0x%p, %u scsi hosts removed.\n",
 174                         t3dev, snic, snic->hba_cnt);
 175         kfree(snic);
 176 }
 177
 178 /**
 179  * cxgb3i_hba_find_by_netdev - find the cxgb3i_hba structure via net_device
 180  * @t3dev: t3cdev adapter
 181  */
 182 static struct cxgb3i_hba *cxgb3i_hba_find_by_netdev(struct net_device *ndev)
 183 {
 184         struct cxgb3i_adapter *snic;
 185         int i;
 186
 187         read_lock(&cxgb3i_snic_rwlock);
 188         list_for_each_entry(snic, &cxgb3i_snic_list, list_head) {
 189                 for (i = 0; i < snic->hba_cnt; i++) {
 190                         if (snic->hba[i]->ndev == ndev) {
 191                                 read_unlock(&cxgb3i_snic_rwlock);
 192                                 return snic->hba[i];
 193                         }
 194                 }
 195         }
 196         read_unlock(&cxgb3i_snic_rwlock);
 197         return NULL;
 198 }
 199
 200 /**
 201  * cxgb3i_hba_host_add - register a new host with scsi/iscsi
 202  * @snic: the cxgb3i adapter
 203  * @ndev: associated net_device
 204  */
 205 struct cxgb3i_hba *cxgb3i_hba_host_add(struct cxgb3i_adapter *snic,
 206                                        struct net_device *ndev)
 207 {
 208         struct cxgb3i_hba *hba;
 209         struct Scsi_Host *shost;
 210         int err;
 211
 212         shost = iscsi_host_alloc(&cxgb3i_host_template,
 213                                  sizeof(struct cxgb3i_hba), 1);
 214         if (!shost) {
 215                 cxgb3i_log_info("snic 0x%p, ndev 0x%p, host_alloc failed.\n",
 216                                 snic, ndev);
 217                 return NULL;
 218         }
 219
 220         shost->transportt = cxgb3i_scsi_transport;
 221         shost->max_lun = CXGB3I_MAX_LUN;
 222         shost->max_id = CXGB3I_MAX_TARGET;
 223         shost->max_channel = 0;
 224         shost->max_cmd_len = 16;
 225
 226         hba = iscsi_host_priv(shost);
 227         hba->snic = snic;
 228         hba->ndev = ndev;
 229         hba->shost = shost;
 230
 231         pci_dev_get(snic->pdev);
 232         err = iscsi_host_add(shost, &snic->pdev->dev);
 233         if (err) {
 234                 cxgb3i_log_info("snic 0x%p, ndev 0x%p, host_add failed.\n",
 235                                 snic, ndev);
 236                 goto pci_dev_put;
 237         }
 238
 239         cxgb3i_api_debug("shost 0x%p, hba 0x%p, no %u.\n",
 240                          shost, hba, shost->host_no);
 241
 242         return hba;
 243
 244 pci_dev_put:
 245         pci_dev_put(snic->pdev);
 246         scsi_host_put(shost);
 247         return NULL;
 248 }
 249
 250 /**
 251  * cxgb3i_hba_host_remove - de-register the host with scsi/iscsi
 252  * @hba: the cxgb3i hba
 253  */
 254 void cxgb3i_hba_host_remove(struct cxgb3i_hba *hba)
 255 {
 256         cxgb3i_api_debug("shost 0x%p, hba 0x%p, no %u.\n",
 257                          hba->shost, hba, hba->shost->host_no);
 258         iscsi_host_remove(hba->shost);
 259         pci_dev_put(hba->snic->pdev);
 260         iscsi_host_free(hba->shost);
 261 }
 262
 263 /**
 264  * cxgb3i_ep_connect - establish TCP connection to target portal
 265  * @shost:              scsi host to use
 266  * @dst_addr:           target IP address
 267  * @non_blocking:       blocking or non-blocking call
 268  *
 269  * Initiates a TCP/IP connection to the dst_addr
 270  */
 271 static struct iscsi_endpoint *cxgb3i_ep_connect(struct Scsi_Host *shost,
 272                                                 struct sockaddr *dst_addr,
 273                                                 int non_blocking)
 274 {
 275         struct iscsi_endpoint *ep;
 276         struct cxgb3i_endpoint *cep;
 277         struct cxgb3i_hba *hba = NULL;
 278         struct s3_conn *c3cn = NULL;
 279         int err = 0;
 280
 281         if (shost)
 282                 hba = iscsi_host_priv(shost);
 283
 284         cxgb3i_api_debug("shost 0x%p, hba 0x%p.\n", shost, hba);
 285
 286         c3cn = cxgb3i_c3cn_create();
 287         if (!c3cn) {
 288                 cxgb3i_log_info("ep connect OOM.\n");
 289                 err = -ENOMEM;
 290                 goto release_conn;
 291         }
 292
 293         err = cxgb3i_c3cn_connect(hba ? hba->ndev : NULL, c3cn,
 294                                  (struct sockaddr_in *)dst_addr);
 295         if (err < 0) {
 296                 cxgb3i_log_info("ep connect failed.\n");
 297                 goto release_conn;
 298         }
 299
 300         hba = cxgb3i_hba_find_by_netdev(c3cn->dst_cache->dev);
 301         if (!hba) {
 302                 err = -ENOSPC;
 303                 cxgb3i_log_info("NOT going through cxgbi device.\n");
 304                 goto release_conn;
 305         }
 306
 307         if (shost && hba != iscsi_host_priv(shost)) {
 308                 err = -ENOSPC;
 309                 cxgb3i_log_info("Could not connect through request host%u\n",
 310                                 shost->host_no);
 311                 goto release_conn;
 312         }
 313
 314         if (c3cn_is_closing(c3cn)) {
 315                 err = -ENOSPC;
 316                 cxgb3i_log_info("ep connect unable to connect.\n");
 317                 goto release_conn;
 318         }
 319
 320         ep = iscsi_create_endpoint(sizeof(*cep));
 321         if (!ep) {
 322                 err = -ENOMEM;
 323                 cxgb3i_log_info("iscsi alloc ep, OOM.\n");
 324                 goto release_conn;
 325         }
 326         cep = ep->dd_data;
 327         cep->c3cn = c3cn;
 328         cep->hba = hba;
 329
 330         cxgb3i_api_debug("ep 0x%p, 0x%p, c3cn 0x%p, hba 0x%p.\n",
 331                           ep, cep, c3cn, hba);
 332         return ep;
 333
 334 release_conn:
 335         cxgb3i_api_debug("conn 0x%p failed, release.\n", c3cn);
 336         if (c3cn)
 337                 cxgb3i_c3cn_release(c3cn);
 338         return ERR_PTR(err);
 339 }
 340
 341 /**
 342  * cxgb3i_ep_poll - polls for TCP connection establishement
 343  * @ep:         TCP connection (endpoint) handle
 344  * @timeout_ms: timeout value in milli secs
 345  *
 346  * polls for TCP connect request to complete
 347  */
 348 static int cxgb3i_ep_poll(struct iscsi_endpoint *ep, int timeout_ms)
 349 {
 350         struct cxgb3i_endpoint *cep = ep->dd_data;
 351         struct s3_conn *c3cn = cep->c3cn;
 352
 353         if (!c3cn_is_established(c3cn))
 354                 return 0;
 355         cxgb3i_api_debug("ep 0x%p, c3cn 0x%p established.\n", ep, c3cn);
 356         return 1;
 357 }
 358
 359 /**
 360  * cxgb3i_ep_disconnect - teardown TCP connection
 361  * @ep:         TCP connection (endpoint) handle
 362  *
 363  * teardown TCP connection
 364  */
 365 static void cxgb3i_ep_disconnect(struct iscsi_endpoint *ep)
 366 {
 367         struct cxgb3i_endpoint *cep = ep->dd_data;
 368         struct cxgb3i_conn *cconn = cep->cconn;
 369
 370         cxgb3i_api_debug("ep 0x%p, cep 0x%p.\n", ep, cep);
 371
 372         if (cconn && cconn->conn) {
 373                 /*
 374                  * stop the xmit path so the xmit_pdu function is
 375                  * not being called
 376                  */
 377                 iscsi_suspend_tx(cconn->conn);
 378
 379                 write_lock_bh(&cep->c3cn->callback_lock);
 380                 cep->c3cn->user_data = NULL;
 381                 cconn->cep = NULL;
 382                 write_unlock_bh(&cep->c3cn->callback_lock);
 383         }
 384
 385         cxgb3i_api_debug("ep 0x%p, cep 0x%p, release c3cn 0x%p.\n",
 386                          ep, cep, cep->c3cn);
 387         cxgb3i_c3cn_release(cep->c3cn);
 388         iscsi_destroy_endpoint(ep);
 389 }
 390
 391 /**
 392  * cxgb3i_session_create - create a new iscsi session
 393  * @cmds_max:           max # of commands
 394  * @qdepth:             scsi queue depth
 395  * @initial_cmdsn:      initial iscsi CMDSN for this session
 396  *
 397  * Creates a new iSCSI session
 398  */
 399 static struct iscsi_cls_session *
 400 cxgb3i_session_create(struct iscsi_endpoint *ep, u16 cmds_max, u16 qdepth,
 401                       u32 initial_cmdsn)
 402 {
 403         struct cxgb3i_endpoint *cep;
 404         struct cxgb3i_hba *hba;
 405         struct Scsi_Host *shost;
 406         struct iscsi_cls_session *cls_session;
 407         struct iscsi_session *session;
 408
 409         if (!ep) {
 410                 cxgb3i_log_error("%s, missing endpoint.\n", __func__);
 411                 return NULL;
 412         }
 413
 414         cep = ep->dd_data;
 415         hba = cep->hba;
 416         shost = hba->shost;
 417         cxgb3i_api_debug("ep 0x%p, cep 0x%p, hba 0x%p.\n", ep, cep, hba);
 418         BUG_ON(hba != iscsi_host_priv(shost));
 419
 420         cls_session = iscsi_session_setup(&cxgb3i_iscsi_transport, shost,
 421                                           cmds_max,
 422                                           sizeof(struct iscsi_tcp_task) +
 423                                           sizeof(struct cxgb3i_task_data),
 424                                           initial_cmdsn, ISCSI_MAX_TARGET);
 425         if (!cls_session)
 426                 return NULL;
 427         session = cls_session->dd_data;
 428         if (iscsi_tcp_r2tpool_alloc(session))
 429                 goto remove_session;
 430
 431         return cls_session;
 432
 433 remove_session:
 434         iscsi_session_teardown(cls_session);
 435         return NULL;
 436 }
 437
 438 /**
 439  * cxgb3i_session_destroy - destroys iscsi session
 440  * @cls_session:        pointer to iscsi cls session
 441  *
 442  * Destroys an iSCSI session instance and releases its all resources held
 443  */
 444 static void cxgb3i_session_destroy(struct iscsi_cls_session *cls_session)
 445 {
 446         cxgb3i_api_debug("sess 0x%p.\n", cls_session);
 447         iscsi_tcp_r2tpool_free(cls_session->dd_data);
 448         iscsi_session_teardown(cls_session);
 449 }
 450
 451 /**
 452  * cxgb3i_conn_max_xmit_dlength -- calc the max. xmit pdu segment size
 453  * @conn: iscsi connection
 454  * check the max. xmit pdu payload, reduce it if needed
 455  */
 456 static inline int cxgb3i_conn_max_xmit_dlength(struct iscsi_conn *conn)
 457
 458 {
 459         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
 460         struct cxgb3i_conn *cconn = tcp_conn->dd_data;
 461         unsigned int max = max(512 * MAX_SKB_FRAGS, SKB_TX_HEADROOM);
 462
 463         max = min(cconn->hba->snic->tx_max_size, max);
 464         if (conn->max_xmit_dlength)
 465                 conn->max_xmit_dlength = min(conn->max_xmit_dlength, max);
 466         else
 467                 conn->max_xmit_dlength = max;
 468         align_pdu_size(conn->max_xmit_dlength);
 469         cxgb3i_api_debug("conn 0x%p, max xmit %u.\n",
 470                          conn, conn->max_xmit_dlength);
 471         return 0;
 472 }
 473
 474 /**
 475  * cxgb3i_conn_max_recv_dlength -- check the max. recv pdu segment size
 476  * @conn: iscsi connection
 477  * return 0 if the value is valid, < 0 otherwise.
 478  */
 479 static inline int cxgb3i_conn_max_recv_dlength(struct iscsi_conn *conn)
 480 {
 481         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
 482         struct cxgb3i_conn *cconn = tcp_conn->dd_data;
 483         unsigned int max = cconn->hba->snic->rx_max_size;
 484
 485         align_pdu_size(max);
 486         if (conn->max_recv_dlength) {
 487                 if (conn->max_recv_dlength > max) {
 488                         cxgb3i_log_error("MaxRecvDataSegmentLength %u too big."
 489                                          " Need to be <= %u.\n",
 490                                          conn->max_recv_dlength, max);
 491                         return -EINVAL;
 492                 }
 493                 conn->max_recv_dlength = min(conn->max_recv_dlength, max);
 494                 align_pdu_size(conn->max_recv_dlength);
 495         } else
 496                 conn->max_recv_dlength = max;
 497         cxgb3i_api_debug("conn 0x%p, max recv %u.\n",
 498                          conn, conn->max_recv_dlength);
 499         return 0;
 500 }
 501
 502 /**
 503  * cxgb3i_conn_create - create iscsi connection instance
 504  * @cls_session:        pointer to iscsi cls session
 505  * @cid:                iscsi cid
 506  *
 507  * Creates a new iSCSI connection instance for a given session
 508  */
 509 static struct iscsi_cls_conn *cxgb3i_conn_create(struct iscsi_cls_session
 510                                                  *cls_session, u32 cid)
 511 {
 512         struct iscsi_cls_conn *cls_conn;
 513         struct iscsi_conn *conn;
 514         struct iscsi_tcp_conn *tcp_conn;
 515         struct cxgb3i_conn *cconn;
 516
 517         cxgb3i_api_debug("sess 0x%p, cid %u.\n", cls_session, cid);
 518
 519         cls_conn = iscsi_tcp_conn_setup(cls_session, sizeof(*cconn), cid);
 520         if (!cls_conn)
 521                 return NULL;
 522         conn = cls_conn->dd_data;
 523         tcp_conn = conn->dd_data;
 524         cconn = tcp_conn->dd_data;
 525
 526         cconn->conn = conn;
 527         return cls_conn;
 528 }
 529
 530 /**
 531  * cxgb3i_conn_bind - binds iscsi sess, conn and endpoint together
 532  * @cls_session:        pointer to iscsi cls session
 533  * @cls_conn:           pointer to iscsi cls conn
 534  * @transport_eph:      64-bit EP handle
 535  * @is_leading:         leading connection on this session?
 536  *
 537  * Binds together an iSCSI session, an iSCSI connection and a
 538  *      TCP connection. This routine returns error code if the TCP
 539  *      connection does not belong on the device iSCSI sess/conn is bound
 540  */
 541
 542 static int cxgb3i_conn_bind(struct iscsi_cls_session *cls_session,
 543                             struct iscsi_cls_conn *cls_conn,
 544                             u64 transport_eph, int is_leading)
 545 {
 546         struct iscsi_conn *conn = cls_conn->dd_data;
 547         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
 548         struct cxgb3i_conn *cconn = tcp_conn->dd_data;
 549         struct cxgb3i_adapter *snic;
 550         struct iscsi_endpoint *ep;
 551         struct cxgb3i_endpoint *cep;
 552         struct s3_conn *c3cn;
 553         int err;
 554
 555         ep = iscsi_lookup_endpoint(transport_eph);
 556         if (!ep)
 557                 return -EINVAL;
 558
 559         /* setup ddp pagesize */
 560         cep = ep->dd_data;
 561         c3cn = cep->c3cn;
 562         snic = cep->hba->snic;
 563         err = cxgb3i_setup_conn_host_pagesize(snic->tdev, c3cn->tid, 0);
 564         if (err < 0)
 565                 return err;
 566
 567         cxgb3i_api_debug("ep 0x%p, cls sess 0x%p, cls conn 0x%p.\n",
 568                          ep, cls_session, cls_conn);
 569
 570         err = iscsi_conn_bind(cls_session, cls_conn, is_leading);
 571         if (err)
 572                 return -EINVAL;
 573
 574         /* calculate the tag idx bits needed for this conn based on cmds_max */
 575         cconn->task_idx_bits = (__ilog2_u32(conn->session->cmds_max - 1)) + 1;
 576         cxgb3i_api_debug("session cmds_max 0x%x, bits %u.\n",
 577                          conn->session->cmds_max, cconn->task_idx_bits);
 578
 579         read_lock(&c3cn->callback_lock);
 580         c3cn->user_data = conn;
 581         cconn->hba = cep->hba;
 582         cconn->cep = cep;
 583         cep->cconn = cconn;
 584         read_unlock(&c3cn->callback_lock);
 585
 586         cxgb3i_conn_max_xmit_dlength(conn);
 587         cxgb3i_conn_max_recv_dlength(conn);
 588
 589         spin_lock_bh(&conn->session->lock);
 590         sprintf(conn->portal_address, NIPQUAD_FMT,
 591                 NIPQUAD(c3cn->daddr.sin_addr.s_addr));
 592         conn->portal_port = ntohs(c3cn->daddr.sin_port);
 593         spin_unlock_bh(&conn->session->lock);
 594
 595         /* init recv engine */
 596         iscsi_tcp_hdr_recv_prep(tcp_conn);
 597
 598         return 0;
 599 }
 600
 601 /**
 602  * cxgb3i_conn_get_param - return iscsi connection parameter to caller
 603  * @cls_conn:   pointer to iscsi cls conn
 604  * @param:      parameter type identifier
 605  * @buf:        buffer pointer
 606  *
 607  * returns iSCSI connection parameters
 608  */
 609 static int cxgb3i_conn_get_param(struct iscsi_cls_conn *cls_conn,
 610                                  enum iscsi_param param, char *buf)
 611 {
 612         struct iscsi_conn *conn = cls_conn->dd_data;
 613         int len;
 614
 615         cxgb3i_api_debug("cls_conn 0x%p, param %d.\n", cls_conn, param);
 616
 617         switch (param) {
 618         case ISCSI_PARAM_CONN_PORT:
 619                 spin_lock_bh(&conn->session->lock);
 620                 len = sprintf(buf, "%hu\n", conn->portal_port);
 621                 spin_unlock_bh(&conn->session->lock);
 622                 break;
 623         case ISCSI_PARAM_CONN_ADDRESS:
 624                 spin_lock_bh(&conn->session->lock);
 625                 len = sprintf(buf, "%s\n", conn->portal_address);
 626                 spin_unlock_bh(&conn->session->lock);
 627                 break;
 628         default:
 629                 return iscsi_conn_get_param(cls_conn, param, buf);
 630         }
 631
 632         return len;
 633 }
 634
 635 /**
 636  * cxgb3i_conn_set_param - set iscsi connection parameter
 637  * @cls_conn:   pointer to iscsi cls conn
 638  * @param:      parameter type identifier
 639  * @buf:        buffer pointer
 640  * @buflen:     buffer length
 641  *
 642  * set iSCSI connection parameters
 643  */
 644 static int cxgb3i_conn_set_param(struct iscsi_cls_conn *cls_conn,
 645                                  enum iscsi_param param, char *buf, int buflen)
 646 {
 647         struct iscsi_conn *conn = cls_conn->dd_data;
 648         struct iscsi_session *session = conn->session;
 649         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
 650         struct cxgb3i_conn *cconn = tcp_conn->dd_data;
 651         struct cxgb3i_adapter *snic = cconn->hba->snic;
 652         struct s3_conn *c3cn = cconn->cep->c3cn;
 653         int value, err = 0;
 654
 655         switch (param) {
 656         case ISCSI_PARAM_HDRDGST_EN:
 657                 err = iscsi_set_param(cls_conn, param, buf, buflen);
 658                 if (!err && conn->hdrdgst_en)
 659                         err = cxgb3i_setup_conn_digest(snic->tdev, c3cn->tid,
 660                                                         conn->hdrdgst_en,
 661                                                         conn->datadgst_en, 0);
 662                 break;
 663         case ISCSI_PARAM_DATADGST_EN:
 664                 err = iscsi_set_param(cls_conn, param, buf, buflen);
 665                 if (!err && conn->datadgst_en)
 666                         err = cxgb3i_setup_conn_digest(snic->tdev, c3cn->tid,
 667                                                         conn->hdrdgst_en,
 668                                                         conn->datadgst_en, 0);
 669                 break;
 670         case ISCSI_PARAM_MAX_R2T:
 671                 sscanf(buf, "%d", &value);
 672                 if (value <= 0 || !is_power_of_2(value))
 673                         return -EINVAL;
 674                 if (session->max_r2t == value)
 675                         break;
 676                 iscsi_tcp_r2tpool_free(session);
 677                 err = iscsi_set_param(cls_conn, param, buf, buflen);
 678                 if (!err && iscsi_tcp_r2tpool_alloc(session))
 679                         return -ENOMEM;
 680         case ISCSI_PARAM_MAX_RECV_DLENGTH:
 681                 err = iscsi_set_param(cls_conn, param, buf, buflen);
 682                 if (!err)
 683                         err = cxgb3i_conn_max_recv_dlength(conn);
 684                 break;
 685         case ISCSI_PARAM_MAX_XMIT_DLENGTH:
 686                 err = iscsi_set_param(cls_conn, param, buf, buflen);
 687                 if (!err)
 688                         err = cxgb3i_conn_max_xmit_dlength(conn);
 689                 break;
 690         default:
 691                 return iscsi_set_param(cls_conn, param, buf, buflen);
 692         }
 693         return err;
 694 }
 695
 696 /**
 697  * cxgb3i_host_set_param - configure host (adapter) related parameters
 698  * @shost:      scsi host pointer
 699  * @param:      parameter type identifier
 700  * @buf:        buffer pointer
 701  */
 702 static int cxgb3i_host_set_param(struct Scsi_Host *shost,
 703                                  enum iscsi_host_param param,
 704                                  char *buf, int buflen)
 705 {
 706         struct cxgb3i_hba *hba = iscsi_host_priv(shost);
 707
 708         cxgb3i_api_debug("param %d, buf %s.\n", param, buf);
 709
 710         switch (param) {
 711         case ISCSI_HOST_PARAM_IPADDRESS:
 712         {
 713                 __be32 addr = in_aton(buf);
 714                 cxgb3i_set_private_ipv4addr(hba->ndev, addr);
 715                 return 0;
 716         }
 717         case ISCSI_HOST_PARAM_HWADDRESS:
 718         case ISCSI_HOST_PARAM_NETDEV_NAME:
 719                 /* ignore */
 720                 return 0;
 721         default:
 722                 return iscsi_host_set_param(shost, param, buf, buflen);
 723         }
 724 }
 725
 726 /**
 727  * cxgb3i_host_get_param - returns host (adapter) related parameters
 728  * @shost:      scsi host pointer
 729  * @param:      parameter type identifier
 730  * @buf:        buffer pointer
 731  */
 732 static int cxgb3i_host_get_param(struct Scsi_Host *shost,
 733                                  enum iscsi_host_param param, char *buf)
 734 {
 735         struct cxgb3i_hba *hba = iscsi_host_priv(shost);
 736         int len = 0;
 737
 738         cxgb3i_api_debug("hba %s, param %d.\n", hba->ndev->name, param);
 739
 740         switch (param) {
 741         case ISCSI_HOST_PARAM_HWADDRESS:
 742                 len = sysfs_format_mac(buf, hba->ndev->dev_addr, 6);
 743                 break;
 744         case ISCSI_HOST_PARAM_NETDEV_NAME:
 745                 len = sprintf(buf, "%s\n", hba->ndev->name);
 746                 break;
 747         case ISCSI_HOST_PARAM_IPADDRESS:
 748         {
 749                 __be32 addr;
 750
 751                 addr = cxgb3i_get_private_ipv4addr(hba->ndev);
 752                 len = sprintf(buf, NIPQUAD_FMT, NIPQUAD(addr));
 753                 break;
 754         }
 755         default:
 756                 return iscsi_host_get_param(shost, param, buf);
 757         }
 758         return len;
 759 }
 760
 761 /**
 762  * cxgb3i_conn_get_stats - returns iSCSI stats
 763  * @cls_conn:   pointer to iscsi cls conn
 764  * @stats:      pointer to iscsi statistic struct
 765  */
 766 static void cxgb3i_conn_get_stats(struct iscsi_cls_conn *cls_conn,
 767                                   struct iscsi_stats *stats)
 768 {
 769         struct iscsi_conn *conn = cls_conn->dd_data;
 770
 771         stats->txdata_octets = conn->txdata_octets;
 772         stats->rxdata_octets = conn->rxdata_octets;
 773         stats->scsicmd_pdus = conn->scsicmd_pdus_cnt;
 774         stats->dataout_pdus = conn->dataout_pdus_cnt;
 775         stats->scsirsp_pdus = conn->scsirsp_pdus_cnt;
 776         stats->datain_pdus = conn->datain_pdus_cnt;
 777         stats->r2t_pdus = conn->r2t_pdus_cnt;
 778         stats->tmfcmd_pdus = conn->tmfcmd_pdus_cnt;
 779         stats->tmfrsp_pdus = conn->tmfrsp_pdus_cnt;
 780         stats->digest_err = 0;
 781         stats->timeout_err = 0;
 782         stats->custom_length = 1;
 783         strcpy(stats->custom[0].desc, "eh_abort_cnt");
 784         stats->custom[0].value = conn->eh_abort_cnt;
 785 }
 786
 787 /**
 788  * cxgb3i_parse_itt - get the idx and age bits from a given tag
 789  * @conn:       iscsi connection
 790  * @itt:        itt tag
 791  * @idx:        task index, filled in by this function
 792  * @age:        session age, filled in by this function
 793  */
 794 static void cxgb3i_parse_itt(struct iscsi_conn *conn, itt_t itt,
 795                              int *idx, int *age)
 796 {
 797         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
 798         struct cxgb3i_conn *cconn = tcp_conn->dd_data;
 799         struct cxgb3i_adapter *snic = cconn->hba->snic;
 800         u32 tag = ntohl((__force u32) itt);
 801         u32 sw_bits;
 802
 803         sw_bits = cxgb3i_tag_nonrsvd_bits(&snic->tag_format, tag);
 804         if (idx)
 805                 *idx = sw_bits & ((1 << cconn->task_idx_bits) - 1);
 806         if (age)
 807                 *age = (sw_bits >> cconn->task_idx_bits) & ISCSI_AGE_MASK;
 808
 809         cxgb3i_tag_debug("parse tag 0x%x/0x%x, sw 0x%x, itt 0x%x, age 0x%x.\n",
 810                          tag, itt, sw_bits, idx ? *idx : 0xFFFFF,
 811                          age ? *age : 0xFF);
 812 }
 813
 814 /**
 815  * cxgb3i_reserve_itt - generate tag for a give task
 816  * @task: iscsi task
 817  * @hdr_itt: tag, filled in by this function
 818  * Set up ddp for scsi read tasks if possible.
 819  */
 820 int cxgb3i_reserve_itt(struct iscsi_task *task, itt_t *hdr_itt)
 821 {
 822         struct scsi_cmnd *sc = task->sc;
 823         struct iscsi_conn *conn = task->conn;
 824         struct iscsi_session *sess = conn->session;
 825         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
 826         struct cxgb3i_conn *cconn = tcp_conn->dd_data;
 827         struct cxgb3i_adapter *snic = cconn->hba->snic;
 828         struct cxgb3i_tag_format *tformat = &snic->tag_format;
 829         u32 sw_tag = (sess->age << cconn->task_idx_bits) | task->itt;
 830         u32 tag;
 831         int err = -EINVAL;
 832
 833         if (sc &&
 834             (scsi_bidi_cmnd(sc) || sc->sc_data_direction == DMA_FROM_DEVICE) &&
 835             cxgb3i_sw_tag_usable(tformat, sw_tag)) {
 836                 struct s3_conn *c3cn = cconn->cep->c3cn;
 837                 struct cxgb3i_gather_list *gl;
 838
 839                 gl = cxgb3i_ddp_make_gl(scsi_in(sc)->length,
 840                                         scsi_in(sc)->table.sgl,
 841                                         scsi_in(sc)->table.nents,
 842                                         snic->pdev,
 843                                         GFP_ATOMIC);
 844                 if (gl) {
 845                         tag = sw_tag;
 846                         err = cxgb3i_ddp_tag_reserve(snic->tdev, c3cn->tid,
 847                                                      tformat, &tag,
 848                                                      gl, GFP_ATOMIC);
 849                         if (err < 0)
 850                                 cxgb3i_ddp_release_gl(gl, snic->pdev);
 851                 }
 852         }
 853
 854         if (err < 0)
 855                 tag = cxgb3i_set_non_ddp_tag(tformat, sw_tag);
 856         /* the itt need to sent in big-endian order */
 857         *hdr_itt = (__force itt_t)htonl(tag);
 858
 859         cxgb3i_tag_debug("new tag 0x%x/0x%x (itt 0x%x, age 0x%x).\n",
 860                          tag, *hdr_itt, task->itt, sess->age);
 861         return 0;
 862 }
 863
 864 /**
 865  * cxgb3i_release_itt - release the tag for a given task
 866  * @task:       iscsi task
 867  * @hdr_itt:    tag
 868  * If the tag is a ddp tag, release the ddp setup
 869  */
 870 void cxgb3i_release_itt(struct iscsi_task *task, itt_t hdr_itt)
 871 {
 872         struct scsi_cmnd *sc = task->sc;
 873         struct iscsi_tcp_conn *tcp_conn = task->conn->dd_data;
 874         struct cxgb3i_conn *cconn = tcp_conn->dd_data;
 875         struct cxgb3i_adapter *snic = cconn->hba->snic;
 876         struct cxgb3i_tag_format *tformat = &snic->tag_format;
 877         u32 tag = ntohl((__force u32)hdr_itt);
 878
 879         cxgb3i_tag_debug("release tag 0x%x.\n", tag);
 880
 881         if (sc &&
 882             (scsi_bidi_cmnd(sc) || sc->sc_data_direction == DMA_FROM_DEVICE) &&
 883             cxgb3i_is_ddp_tag(tformat, tag))
 884                 cxgb3i_ddp_tag_release(snic->tdev, tag);
 885 }
 886
 887 /**
 888  * cxgb3i_host_template -- Scsi_Host_Template structure
 889  *      used when registering with the scsi mid layer
 890  */
 891 static struct scsi_host_template cxgb3i_host_template = {
 892         .module                 = THIS_MODULE,
 893         .name                   = "Chelsio S3xx iSCSI Initiator",
 894         .proc_name              = "cxgb3i",
 895         .queuecommand           = iscsi_queuecommand,
 896         .change_queue_depth     = iscsi_change_queue_depth,
 897         .can_queue              = CXGB3I_SCSI_HOST_QDEPTH,
 898         .sg_tablesize           = SG_ALL,
 899         .max_sectors            = 0xFFFF,
 900         .cmd_per_lun            = ISCSI_DEF_CMD_PER_LUN,
 901         .eh_abort_handler       = iscsi_eh_abort,
 902         .eh_device_reset_handler = iscsi_eh_device_reset,
 903         .eh_target_reset_handler = iscsi_eh_target_reset,
 904         .target_alloc           = iscsi_target_alloc,
 905         .use_clustering         = DISABLE_CLUSTERING,
 906         .this_id                = -1,
 907 };
 908
 909 static struct iscsi_transport cxgb3i_iscsi_transport = {
 910         .owner                  = THIS_MODULE,
 911         .name                   = "cxgb3i",
 912         .caps                   = CAP_RECOVERY_L0 | CAP_MULTI_R2T | CAP_HDRDGST
 913                                 | CAP_DATADGST | CAP_DIGEST_OFFLOAD |
 914                                 CAP_PADDING_OFFLOAD,
 915         .param_mask             = ISCSI_MAX_RECV_DLENGTH |
 916                                 ISCSI_MAX_XMIT_DLENGTH |
 917                                 ISCSI_HDRDGST_EN |
 918                                 ISCSI_DATADGST_EN |
 919                                 ISCSI_INITIAL_R2T_EN |
 920                                 ISCSI_MAX_R2T |
 921                                 ISCSI_IMM_DATA_EN |
 922                                 ISCSI_FIRST_BURST |
 923                                 ISCSI_MAX_BURST |
 924                                 ISCSI_PDU_INORDER_EN |
 925                                 ISCSI_DATASEQ_INORDER_EN |
 926                                 ISCSI_ERL |
 927                                 ISCSI_CONN_PORT |
 928                                 ISCSI_CONN_ADDRESS |
 929                                 ISCSI_EXP_STATSN |
 930                                 ISCSI_PERSISTENT_PORT |
 931                                 ISCSI_PERSISTENT_ADDRESS |
 932                                 ISCSI_TARGET_NAME | ISCSI_TPGT |
 933                                 ISCSI_USERNAME | ISCSI_PASSWORD |
 934                                 ISCSI_USERNAME_IN | ISCSI_PASSWORD_IN |
 935                                 ISCSI_FAST_ABORT | ISCSI_ABORT_TMO |
 936                                 ISCSI_LU_RESET_TMO |
 937                                 ISCSI_PING_TMO | ISCSI_RECV_TMO |
 938                                 ISCSI_IFACE_NAME | ISCSI_INITIATOR_NAME,
 939         .host_param_mask        = ISCSI_HOST_HWADDRESS | ISCSI_HOST_IPADDRESS |
 940                         ISCSI_HOST_INITIATOR_NAME | ISCSI_HOST_NETDEV_NAME,
 941         .get_host_param         = cxgb3i_host_get_param,
 942         .set_host_param         = cxgb3i_host_set_param,
 943         /* session management */
 944         .create_session         = cxgb3i_session_create,
 945         .destroy_session        = cxgb3i_session_destroy,
 946         .get_session_param      = iscsi_session_get_param,
 947         /* connection management */
 948         .create_conn            = cxgb3i_conn_create,
 949         .bind_conn              = cxgb3i_conn_bind,
 950         .destroy_conn           = iscsi_tcp_conn_teardown,
 951         .start_conn             = iscsi_conn_start,
 952         .stop_conn              = iscsi_conn_stop,
 953         .get_conn_param         = cxgb3i_conn_get_param,
 954         .set_param              = cxgb3i_conn_set_param,
 955         .get_stats              = cxgb3i_conn_get_stats,
 956         /* pdu xmit req. from user space */
 957         .send_pdu               = iscsi_conn_send_pdu,
 958         /* task */
 959         .init_task              = iscsi_tcp_task_init,
 960         .xmit_task              = iscsi_tcp_task_xmit,
 961         .cleanup_task           = cxgb3i_conn_cleanup_task,
 962
 963         /* pdu */
 964         .alloc_pdu              = cxgb3i_conn_alloc_pdu,
 965         .init_pdu               = cxgb3i_conn_init_pdu,
 966         .xmit_pdu               = cxgb3i_conn_xmit_pdu,
 967         .parse_pdu_itt          = cxgb3i_parse_itt,
 968
 969         /* TCP connect/disconnect */
 970         .ep_connect             = cxgb3i_ep_connect,
 971         .ep_poll                = cxgb3i_ep_poll,
 972         .ep_disconnect          = cxgb3i_ep_disconnect,
 973         /* Error recovery timeout call */
 974         .session_recovery_timedout = iscsi_session_recovery_timedout,
 975 };
 976
 977 int cxgb3i_iscsi_init(void)
 978 {
 979         sw_tag_idx_bits = (__ilog2_u32(ISCSI_ITT_MASK)) + 1;
 980         sw_tag_age_bits = (__ilog2_u32(ISCSI_AGE_MASK)) + 1;
 981         cxgb3i_log_info("tag itt 0x%x, %u bits, age 0x%x, %u bits.\n",
 982                         ISCSI_ITT_MASK, sw_tag_idx_bits,
 983                         ISCSI_AGE_MASK, sw_tag_age_bits);
 984
 985         cxgb3i_scsi_transport =
 986             iscsi_register_transport(&cxgb3i_iscsi_transport);
 987         if (!cxgb3i_scsi_transport) {
 988                 cxgb3i_log_error("Could not register cxgb3i transport.\n");
 989                 return -ENODEV;
 990         }
 991         cxgb3i_api_debug("cxgb3i transport 0x%p.\n", cxgb3i_scsi_transport);
 992         return 0;
 993 }
 994
 995 void cxgb3i_iscsi_cleanup(void)
 996 {
 997         if (cxgb3i_scsi_transport) {
 998                 cxgb3i_api_debug("cxgb3i transport 0x%p.\n",
 999                                  cxgb3i_scsi_transport);
1000                 iscsi_unregister_transport(&cxgb3i_iscsi_transport);
1001         }
1002 }