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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 <linux/if_vlan.h>
  17 #include <net/dst.h>
  18 #include <net/tcp.h>
  19 #include <scsi/scsi_cmnd.h>
  20 #include <scsi/scsi_device.h>
  21 #include <scsi/scsi_eh.h>
  22 #include <scsi/scsi_host.h>
  23 #include <scsi/scsi.h>
  24 #include <scsi/iscsi_proto.h>
  25 #include <scsi/libiscsi.h>
  26 #include <scsi/scsi_transport_iscsi.h>
  27
  28 #include "cxgb3i.h"
  29 #include "cxgb3i_pdu.h"
  30
  31 #ifdef __DEBUG_CXGB3I_TAG__
  32 #define cxgb3i_tag_debug        cxgb3i_log_debug
  33 #else
  34 #define cxgb3i_tag_debug(fmt...)
  35 #endif
  36
  37 #ifdef __DEBUG_CXGB3I_API__
  38 #define cxgb3i_api_debug        cxgb3i_log_debug
  39 #else
  40 #define cxgb3i_api_debug(fmt...)
  41 #endif
  42
  43 /*
  44  * align pdu size to multiple of 512 for better performance
  45  */
  46 #define align_pdu_size(n) do { n = (n) & (~511); } while (0)
  47
  48 static struct scsi_transport_template *cxgb3i_scsi_transport;
  49 static struct scsi_host_template cxgb3i_host_template;
  50 static struct iscsi_transport cxgb3i_iscsi_transport;
  51 static unsigned char sw_tag_idx_bits;
  52 static unsigned char sw_tag_age_bits;
  53
  54 static LIST_HEAD(cxgb3i_snic_list);
  55 static DEFINE_RWLOCK(cxgb3i_snic_rwlock);
  56
  57 /**
  58  * cxgb3i_adpater_find_by_tdev - find the cxgb3i_adapter structure via t3cdev
  59  * @tdev: t3cdev pointer
  60  */
  61 struct cxgb3i_adapter *cxgb3i_adapter_find_by_tdev(struct t3cdev *tdev)
  62 {
  63         struct cxgb3i_adapter *snic;
  64
  65         read_lock(&cxgb3i_snic_rwlock);
  66         list_for_each_entry(snic, &cxgb3i_snic_list, list_head) {
  67                 if (snic->tdev == tdev) {
  68                         read_unlock(&cxgb3i_snic_rwlock);
  69                         return snic;
  70                 }
  71         }
  72         read_unlock(&cxgb3i_snic_rwlock);
  73         return NULL;
  74 }
  75
  76 static inline int adapter_update(struct cxgb3i_adapter *snic)
  77 {
  78         cxgb3i_log_info("snic 0x%p, t3dev 0x%p, updating.\n",
  79                         snic, snic->tdev);
  80         return cxgb3i_adapter_ddp_info(snic->tdev, &snic->tag_format,
  81                                         &snic->tx_max_size,
  82                                         &snic->rx_max_size);
  83 }
  84
  85 static int adapter_add(struct cxgb3i_adapter *snic)
  86 {
  87         struct t3cdev *t3dev = snic->tdev;
  88         struct adapter *adapter = tdev2adap(t3dev);
  89         int i, err;
  90
  91         snic->pdev = adapter->pdev;
  92         snic->tag_format.sw_bits = sw_tag_idx_bits + sw_tag_age_bits;
  93
  94         err = cxgb3i_adapter_ddp_info(t3dev, &snic->tag_format,
  95                                     &snic->tx_max_size,
  96                                     &snic->rx_max_size);
  97         if (err < 0)
  98                 return err;
  99
 100         for_each_port(adapter, i) {
 101                 snic->hba[i] = cxgb3i_hba_host_add(snic, adapter->port[i]);
 102                 if (!snic->hba[i])
 103                         return -EINVAL;
 104         }
 105         snic->hba_cnt = adapter->params.nports;
 106
 107         /* add to the list */
 108         write_lock(&cxgb3i_snic_rwlock);
 109         list_add_tail(&snic->list_head, &cxgb3i_snic_list);
 110         write_unlock(&cxgb3i_snic_rwlock);
 111
 112         cxgb3i_log_info("t3dev 0x%p open, snic 0x%p, %u scsi hosts added.\n",
 113                         t3dev, snic, snic->hba_cnt);
 114         return 0;
 115 }
 116
 117 /**
 118  * cxgb3i_adapter_open - init a s3 adapter structure and any h/w settings
 119  * @t3dev: t3cdev adapter
 120  */
 121 void cxgb3i_adapter_open(struct t3cdev *t3dev)
 122 {
 123         struct cxgb3i_adapter *snic = cxgb3i_adapter_find_by_tdev(t3dev);
 124         int err;
 125
 126         if (snic)
 127                 err = adapter_update(snic);
 128         else {
 129                 snic = kzalloc(sizeof(*snic), GFP_KERNEL);
 130                 if (snic) {
 131                         spin_lock_init(&snic->lock);
 132                         snic->tdev = t3dev;
 133                         err = adapter_add(snic);
 134                 } else
 135                         err = -ENOMEM;
 136         }
 137
 138         if (err < 0) {
 139                 cxgb3i_log_info("snic 0x%p, f 0x%x, t3dev 0x%p open, err %d.\n",
 140                                 snic, snic ? snic->flags : 0, t3dev, err);
 141                 if (snic) {
 142                         snic->flags &= ~CXGB3I_ADAPTER_FLAG_RESET;
 143                         cxgb3i_adapter_close(t3dev);
 144                 }
 145         }
 146 }
 147
 148 /**
 149  * cxgb3i_adapter_close - release the resources held and cleanup h/w settings
 150  * @t3dev: t3cdev adapter
 151  */
 152 void cxgb3i_adapter_close(struct t3cdev *t3dev)
 153 {
 154         struct cxgb3i_adapter *snic = cxgb3i_adapter_find_by_tdev(t3dev);
 155         int i;
 156
 157         if (!snic || snic->flags & CXGB3I_ADAPTER_FLAG_RESET) {
 158                 cxgb3i_log_info("t3dev 0x%p close, snic 0x%p, f 0x%x.\n",
 159                                 t3dev, snic, snic ? snic->flags : 0);
 160                 return;
 161         }
 162
 163         /* remove from the list */
 164         write_lock(&cxgb3i_snic_rwlock);
 165         list_del(&snic->list_head);
 166         write_unlock(&cxgb3i_snic_rwlock);
 167
 168         for (i = 0; i < snic->hba_cnt; i++) {
 169                 if (snic->hba[i]) {
 170                         cxgb3i_hba_host_remove(snic->hba[i]);
 171                         snic->hba[i] = NULL;
 172                 }
 173         }
 174         cxgb3i_log_info("t3dev 0x%p close, snic 0x%p, %u scsi hosts removed.\n",
 175                         t3dev, snic, snic->hba_cnt);
 176         kfree(snic);
 177 }
 178
 179 /**
 180  * cxgb3i_hba_find_by_netdev - find the cxgb3i_hba structure via net_device
 181  * @t3dev: t3cdev adapter
 182  */
 183 static struct cxgb3i_hba *cxgb3i_hba_find_by_netdev(struct net_device *ndev)
 184 {
 185         struct cxgb3i_adapter *snic;
 186         int i;
 187
 188         if (ndev->priv_flags & IFF_802_1Q_VLAN)
 189                 ndev = vlan_dev_real_dev(ndev);
 190
 191         read_lock(&cxgb3i_snic_rwlock);
 192         list_for_each_entry(snic, &cxgb3i_snic_list, list_head) {
 193                 for (i = 0; i < snic->hba_cnt; i++) {
 194                         if (snic->hba[i]->ndev == ndev) {
 195                                 read_unlock(&cxgb3i_snic_rwlock);
 196                                 return snic->hba[i];
 197                         }
 198                 }
 199         }
 200         read_unlock(&cxgb3i_snic_rwlock);
 201         return NULL;
 202 }
 203
 204 /**
 205  * cxgb3i_hba_host_add - register a new host with scsi/iscsi
 206  * @snic: the cxgb3i adapter
 207  * @ndev: associated net_device
 208  */
 209 struct cxgb3i_hba *cxgb3i_hba_host_add(struct cxgb3i_adapter *snic,
 210                                        struct net_device *ndev)
 211 {
 212         struct cxgb3i_hba *hba;
 213         struct Scsi_Host *shost;
 214         int err;
 215
 216         shost = iscsi_host_alloc(&cxgb3i_host_template,
 217                                  sizeof(struct cxgb3i_hba), 1);
 218         if (!shost) {
 219                 cxgb3i_log_info("snic 0x%p, ndev 0x%p, host_alloc failed.\n",
 220                                 snic, ndev);
 221                 return NULL;
 222         }
 223
 224         shost->transportt = cxgb3i_scsi_transport;
 225         shost->max_lun = CXGB3I_MAX_LUN;
 226         shost->max_id = CXGB3I_MAX_TARGET;
 227         shost->max_channel = 0;
 228         shost->max_cmd_len = 16;
 229
 230         hba = iscsi_host_priv(shost);
 231         hba->snic = snic;
 232         hba->ndev = ndev;
 233         hba->shost = shost;
 234
 235         pci_dev_get(snic->pdev);
 236         err = iscsi_host_add(shost, &snic->pdev->dev);
 237         if (err) {
 238                 cxgb3i_log_info("snic 0x%p, ndev 0x%p, host_add failed.\n",
 239                                 snic, ndev);
 240                 goto pci_dev_put;
 241         }
 242
 243         cxgb3i_api_debug("shost 0x%p, hba 0x%p, no %u.\n",
 244                          shost, hba, shost->host_no);
 245
 246         return hba;
 247
 248 pci_dev_put:
 249         pci_dev_put(snic->pdev);
 250         scsi_host_put(shost);
 251         return NULL;
 252 }
 253
 254 /**
 255  * cxgb3i_hba_host_remove - de-register the host with scsi/iscsi
 256  * @hba: the cxgb3i hba
 257  */
 258 void cxgb3i_hba_host_remove(struct cxgb3i_hba *hba)
 259 {
 260         cxgb3i_api_debug("shost 0x%p, hba 0x%p, no %u.\n",
 261                          hba->shost, hba, hba->shost->host_no);
 262         iscsi_host_remove(hba->shost);
 263         pci_dev_put(hba->snic->pdev);
 264         iscsi_host_free(hba->shost);
 265 }
 266
 267 /**
 268  * cxgb3i_ep_connect - establish TCP connection to target portal
 269  * @shost:              scsi host to use
 270  * @dst_addr:           target IP address
 271  * @non_blocking:       blocking or non-blocking call
 272  *
 273  * Initiates a TCP/IP connection to the dst_addr
 274  */
 275 static struct iscsi_endpoint *cxgb3i_ep_connect(struct Scsi_Host *shost,
 276                                                 struct sockaddr *dst_addr,
 277                                                 int non_blocking)
 278 {
 279         struct iscsi_endpoint *ep;
 280         struct cxgb3i_endpoint *cep;
 281         struct cxgb3i_hba *hba = NULL;
 282         struct s3_conn *c3cn = NULL;
 283         int err = 0;
 284
 285         if (shost)
 286                 hba = iscsi_host_priv(shost);
 287
 288         cxgb3i_api_debug("shost 0x%p, hba 0x%p.\n", shost, hba);
 289
 290         c3cn = cxgb3i_c3cn_create();
 291         if (!c3cn) {
 292                 cxgb3i_log_info("ep connect OOM.\n");
 293                 err = -ENOMEM;
 294                 goto release_conn;
 295         }
 296
 297         err = cxgb3i_c3cn_connect(hba ? hba->ndev : NULL, c3cn,
 298                                  (struct sockaddr_in *)dst_addr);
 299         if (err < 0) {
 300                 cxgb3i_log_info("ep connect failed.\n");
 301                 goto release_conn;
 302         }
 303
 304         hba = cxgb3i_hba_find_by_netdev(c3cn->dst_cache->dev);
 305         if (!hba) {
 306                 err = -ENOSPC;
 307                 cxgb3i_log_info("NOT going through cxgbi device.\n");
 308                 goto release_conn;
 309         }
 310
 311         if (shost && hba != iscsi_host_priv(shost)) {
 312                 err = -ENOSPC;
 313                 cxgb3i_log_info("Could not connect through request host%u\n",
 314                                 shost->host_no);
 315                 goto release_conn;
 316         }
 317
 318         if (c3cn_is_closing(c3cn)) {
 319                 err = -ENOSPC;
 320                 cxgb3i_log_info("ep connect unable to connect.\n");
 321                 goto release_conn;
 322         }
 323
 324         ep = iscsi_create_endpoint(sizeof(*cep));
 325         if (!ep) {
 326                 err = -ENOMEM;
 327                 cxgb3i_log_info("iscsi alloc ep, OOM.\n");
 328                 goto release_conn;
 329         }
 330         cep = ep->dd_data;
 331         cep->c3cn = c3cn;
 332         cep->hba = hba;
 333
 334         cxgb3i_api_debug("ep 0x%p, 0x%p, c3cn 0x%p, hba 0x%p.\n",
 335                           ep, cep, c3cn, hba);
 336         return ep;
 337
 338 release_conn:
 339         cxgb3i_api_debug("conn 0x%p failed, release.\n", c3cn);
 340         if (c3cn)
 341                 cxgb3i_c3cn_release(c3cn);
 342         return ERR_PTR(err);
 343 }
 344
 345 /**
 346  * cxgb3i_ep_poll - polls for TCP connection establishement
 347  * @ep:         TCP connection (endpoint) handle
 348  * @timeout_ms: timeout value in milli secs
 349  *
 350  * polls for TCP connect request to complete
 351  */
 352 static int cxgb3i_ep_poll(struct iscsi_endpoint *ep, int timeout_ms)
 353 {
 354         struct cxgb3i_endpoint *cep = ep->dd_data;
 355         struct s3_conn *c3cn = cep->c3cn;
 356
 357         if (!c3cn_is_established(c3cn))
 358                 return 0;
 359         cxgb3i_api_debug("ep 0x%p, c3cn 0x%p established.\n", ep, c3cn);
 360         return 1;
 361 }
 362
 363 /**
 364  * cxgb3i_ep_disconnect - teardown TCP connection
 365  * @ep:         TCP connection (endpoint) handle
 366  *
 367  * teardown TCP connection
 368  */
 369 static void cxgb3i_ep_disconnect(struct iscsi_endpoint *ep)
 370 {
 371         struct cxgb3i_endpoint *cep = ep->dd_data;
 372         struct cxgb3i_conn *cconn = cep->cconn;
 373
 374         cxgb3i_api_debug("ep 0x%p, cep 0x%p.\n", ep, cep);
 375
 376         if (cconn && cconn->conn) {
 377                 /*
 378                  * stop the xmit path so the xmit_pdu function is
 379                  * not being called
 380                  */
 381                 iscsi_suspend_tx(cconn->conn);
 382
 383                 write_lock_bh(&cep->c3cn->callback_lock);
 384                 cep->c3cn->user_data = NULL;
 385                 cconn->cep = NULL;
 386                 write_unlock_bh(&cep->c3cn->callback_lock);
 387         }
 388
 389         cxgb3i_api_debug("ep 0x%p, cep 0x%p, release c3cn 0x%p.\n",
 390                          ep, cep, cep->c3cn);
 391         cxgb3i_c3cn_release(cep->c3cn);
 392         iscsi_destroy_endpoint(ep);
 393 }
 394
 395 /**
 396  * cxgb3i_session_create - create a new iscsi session
 397  * @cmds_max:           max # of commands
 398  * @qdepth:             scsi queue depth
 399  * @initial_cmdsn:      initial iscsi CMDSN for this session
 400  *
 401  * Creates a new iSCSI session
 402  */
 403 static struct iscsi_cls_session *
 404 cxgb3i_session_create(struct iscsi_endpoint *ep, u16 cmds_max, u16 qdepth,
 405                       u32 initial_cmdsn)
 406 {
 407         struct cxgb3i_endpoint *cep;
 408         struct cxgb3i_hba *hba;
 409         struct Scsi_Host *shost;
 410         struct iscsi_cls_session *cls_session;
 411         struct iscsi_session *session;
 412
 413         if (!ep) {
 414                 cxgb3i_log_error("%s, missing endpoint.\n", __func__);
 415                 return NULL;
 416         }
 417
 418         cep = ep->dd_data;
 419         hba = cep->hba;
 420         shost = hba->shost;
 421         cxgb3i_api_debug("ep 0x%p, cep 0x%p, hba 0x%p.\n", ep, cep, hba);
 422         BUG_ON(hba != iscsi_host_priv(shost));
 423
 424         cls_session = iscsi_session_setup(&cxgb3i_iscsi_transport, shost,
 425                                           cmds_max, 0,
 426                                           sizeof(struct iscsi_tcp_task) +
 427                                           sizeof(struct cxgb3i_task_data),
 428                                           initial_cmdsn, ISCSI_MAX_TARGET);
 429         if (!cls_session)
 430                 return NULL;
 431         session = cls_session->dd_data;
 432         if (iscsi_tcp_r2tpool_alloc(session))
 433                 goto remove_session;
 434
 435         return cls_session;
 436
 437 remove_session:
 438         iscsi_session_teardown(cls_session);
 439         return NULL;
 440 }
 441
 442 /**
 443  * cxgb3i_session_destroy - destroys iscsi session
 444  * @cls_session:        pointer to iscsi cls session
 445  *
 446  * Destroys an iSCSI session instance and releases its all resources held
 447  */
 448 static void cxgb3i_session_destroy(struct iscsi_cls_session *cls_session)
 449 {
 450         cxgb3i_api_debug("sess 0x%p.\n", cls_session);
 451         iscsi_tcp_r2tpool_free(cls_session->dd_data);
 452         iscsi_session_teardown(cls_session);
 453 }
 454
 455 /**
 456  * cxgb3i_conn_max_xmit_dlength -- calc the max. xmit pdu segment size
 457  * @conn: iscsi connection
 458  * check the max. xmit pdu payload, reduce it if needed
 459  */
 460 static inline int cxgb3i_conn_max_xmit_dlength(struct iscsi_conn *conn)
 461
 462 {
 463         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
 464         struct cxgb3i_conn *cconn = tcp_conn->dd_data;
 465         unsigned int max = max(512 * MAX_SKB_FRAGS, SKB_TX_HEADROOM);
 466
 467         max = min(cconn->hba->snic->tx_max_size, max);
 468         if (conn->max_xmit_dlength)
 469                 conn->max_xmit_dlength = min(conn->max_xmit_dlength, max);
 470         else
 471                 conn->max_xmit_dlength = max;
 472         align_pdu_size(conn->max_xmit_dlength);
 473         cxgb3i_api_debug("conn 0x%p, max xmit %u.\n",
 474                          conn, conn->max_xmit_dlength);
 475         return 0;
 476 }
 477
 478 /**
 479  * cxgb3i_conn_max_recv_dlength -- check the max. recv pdu segment size
 480  * @conn: iscsi connection
 481  * return 0 if the value is valid, < 0 otherwise.
 482  */
 483 static inline int cxgb3i_conn_max_recv_dlength(struct iscsi_conn *conn)
 484 {
 485         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
 486         struct cxgb3i_conn *cconn = tcp_conn->dd_data;
 487         unsigned int max = cconn->hba->snic->rx_max_size;
 488
 489         align_pdu_size(max);
 490         if (conn->max_recv_dlength) {
 491                 if (conn->max_recv_dlength > max) {
 492                         cxgb3i_log_error("MaxRecvDataSegmentLength %u too big."
 493                                          " Need to be <= %u.\n",
 494                                          conn->max_recv_dlength, max);
 495                         return -EINVAL;
 496                 }
 497                 conn->max_recv_dlength = min(conn->max_recv_dlength, max);
 498                 align_pdu_size(conn->max_recv_dlength);
 499         } else
 500                 conn->max_recv_dlength = max;
 501         cxgb3i_api_debug("conn 0x%p, max recv %u.\n",
 502                          conn, conn->max_recv_dlength);
 503         return 0;
 504 }
 505
 506 /**
 507  * cxgb3i_conn_create - create iscsi connection instance
 508  * @cls_session:        pointer to iscsi cls session
 509  * @cid:                iscsi cid
 510  *
 511  * Creates a new iSCSI connection instance for a given session
 512  */
 513 static struct iscsi_cls_conn *cxgb3i_conn_create(struct iscsi_cls_session
 514                                                  *cls_session, u32 cid)
 515 {
 516         struct iscsi_cls_conn *cls_conn;
 517         struct iscsi_conn *conn;
 518         struct iscsi_tcp_conn *tcp_conn;
 519         struct cxgb3i_conn *cconn;
 520
 521         cxgb3i_api_debug("sess 0x%p, cid %u.\n", cls_session, cid);
 522
 523         cls_conn = iscsi_tcp_conn_setup(cls_session, sizeof(*cconn), cid);
 524         if (!cls_conn)
 525                 return NULL;
 526         conn = cls_conn->dd_data;
 527         tcp_conn = conn->dd_data;
 528         cconn = tcp_conn->dd_data;
 529
 530         cconn->conn = conn;
 531         return cls_conn;
 532 }
 533
 534 /**
 535  * cxgb3i_conn_bind - binds iscsi sess, conn and endpoint together
 536  * @cls_session:        pointer to iscsi cls session
 537  * @cls_conn:           pointer to iscsi cls conn
 538  * @transport_eph:      64-bit EP handle
 539  * @is_leading:         leading connection on this session?
 540  *
 541  * Binds together an iSCSI session, an iSCSI connection and a
 542  *      TCP connection. This routine returns error code if the TCP
 543  *      connection does not belong on the device iSCSI sess/conn is bound
 544  */
 545
 546 static int cxgb3i_conn_bind(struct iscsi_cls_session *cls_session,
 547                             struct iscsi_cls_conn *cls_conn,
 548                             u64 transport_eph, int is_leading)
 549 {
 550         struct iscsi_conn *conn = cls_conn->dd_data;
 551         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
 552         struct cxgb3i_conn *cconn = tcp_conn->dd_data;
 553         struct cxgb3i_adapter *snic;
 554         struct iscsi_endpoint *ep;
 555         struct cxgb3i_endpoint *cep;
 556         struct s3_conn *c3cn;
 557         int err;
 558
 559         ep = iscsi_lookup_endpoint(transport_eph);
 560         if (!ep)
 561                 return -EINVAL;
 562
 563         /* setup ddp pagesize */
 564         cep = ep->dd_data;
 565         c3cn = cep->c3cn;
 566         snic = cep->hba->snic;
 567         err = cxgb3i_setup_conn_host_pagesize(snic->tdev, c3cn->tid, 0);
 568         if (err < 0)
 569                 return err;
 570
 571         cxgb3i_api_debug("ep 0x%p, cls sess 0x%p, cls conn 0x%p.\n",
 572                          ep, cls_session, cls_conn);
 573
 574         err = iscsi_conn_bind(cls_session, cls_conn, is_leading);
 575         if (err)
 576                 return -EINVAL;
 577
 578         /* calculate the tag idx bits needed for this conn based on cmds_max */
 579         cconn->task_idx_bits = (__ilog2_u32(conn->session->cmds_max - 1)) + 1;
 580         cxgb3i_api_debug("session cmds_max 0x%x, bits %u.\n",
 581                          conn->session->cmds_max, cconn->task_idx_bits);
 582
 583         read_lock(&c3cn->callback_lock);
 584         c3cn->user_data = conn;
 585         cconn->hba = cep->hba;
 586         cconn->cep = cep;
 587         cep->cconn = cconn;
 588         read_unlock(&c3cn->callback_lock);
 589
 590         cxgb3i_conn_max_xmit_dlength(conn);
 591         cxgb3i_conn_max_recv_dlength(conn);
 592
 593         spin_lock_bh(&conn->session->lock);
 594         sprintf(conn->portal_address, "%pI4", &c3cn->daddr.sin_addr.s_addr);
 595         conn->portal_port = ntohs(c3cn->daddr.sin_port);
 596         spin_unlock_bh(&conn->session->lock);
 597
 598         /* init recv engine */
 599         iscsi_tcp_hdr_recv_prep(tcp_conn);
 600
 601         return 0;
 602 }
 603
 604 /**
 605  * cxgb3i_conn_get_param - return iscsi connection parameter to caller
 606  * @cls_conn:   pointer to iscsi cls conn
 607  * @param:      parameter type identifier
 608  * @buf:        buffer pointer
 609  *
 610  * returns iSCSI connection parameters
 611  */
 612 static int cxgb3i_conn_get_param(struct iscsi_cls_conn *cls_conn,
 613                                  enum iscsi_param param, char *buf)
 614 {
 615         struct iscsi_conn *conn = cls_conn->dd_data;
 616         int len;
 617
 618         cxgb3i_api_debug("cls_conn 0x%p, param %d.\n", cls_conn, param);
 619
 620         switch (param) {
 621         case ISCSI_PARAM_CONN_PORT:
 622                 spin_lock_bh(&conn->session->lock);
 623                 len = sprintf(buf, "%hu\n", conn->portal_port);
 624                 spin_unlock_bh(&conn->session->lock);
 625                 break;
 626         case ISCSI_PARAM_CONN_ADDRESS:
 627                 spin_lock_bh(&conn->session->lock);
 628                 len = sprintf(buf, "%s\n", conn->portal_address);
 629                 spin_unlock_bh(&conn->session->lock);
 630                 break;
 631         default:
 632                 return iscsi_conn_get_param(cls_conn, param, buf);
 633         }
 634
 635         return len;
 636 }
 637
 638 /**
 639  * cxgb3i_conn_set_param - set iscsi connection parameter
 640  * @cls_conn:   pointer to iscsi cls conn
 641  * @param:      parameter type identifier
 642  * @buf:        buffer pointer
 643  * @buflen:     buffer length
 644  *
 645  * set iSCSI connection parameters
 646  */
 647 static int cxgb3i_conn_set_param(struct iscsi_cls_conn *cls_conn,
 648                                  enum iscsi_param param, char *buf, int buflen)
 649 {
 650         struct iscsi_conn *conn = cls_conn->dd_data;
 651         struct iscsi_session *session = conn->session;
 652         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
 653         struct cxgb3i_conn *cconn = tcp_conn->dd_data;
 654         struct cxgb3i_adapter *snic = cconn->hba->snic;
 655         struct s3_conn *c3cn = cconn->cep->c3cn;
 656         int value, err = 0;
 657
 658         switch (param) {
 659         case ISCSI_PARAM_HDRDGST_EN:
 660                 err = iscsi_set_param(cls_conn, param, buf, buflen);
 661                 if (!err && conn->hdrdgst_en)
 662                         err = cxgb3i_setup_conn_digest(snic->tdev, c3cn->tid,
 663                                                         conn->hdrdgst_en,
 664                                                         conn->datadgst_en, 0);
 665                 break;
 666         case ISCSI_PARAM_DATADGST_EN:
 667                 err = iscsi_set_param(cls_conn, param, buf, buflen);
 668                 if (!err && conn->datadgst_en)
 669                         err = cxgb3i_setup_conn_digest(snic->tdev, c3cn->tid,
 670                                                         conn->hdrdgst_en,
 671                                                         conn->datadgst_en, 0);
 672                 break;
 673         case ISCSI_PARAM_MAX_R2T:
 674                 sscanf(buf, "%d", &value);
 675                 if (value <= 0 || !is_power_of_2(value))
 676                         return -EINVAL;
 677                 if (session->max_r2t == value)
 678                         break;
 679                 iscsi_tcp_r2tpool_free(session);
 680                 err = iscsi_set_param(cls_conn, param, buf, buflen);
 681                 if (!err && iscsi_tcp_r2tpool_alloc(session))
 682                         return -ENOMEM;
 683         case ISCSI_PARAM_MAX_RECV_DLENGTH:
 684                 err = iscsi_set_param(cls_conn, param, buf, buflen);
 685                 if (!err)
 686                         err = cxgb3i_conn_max_recv_dlength(conn);
 687                 break;
 688         case ISCSI_PARAM_MAX_XMIT_DLENGTH:
 689                 err = iscsi_set_param(cls_conn, param, buf, buflen);
 690                 if (!err)
 691                         err = cxgb3i_conn_max_xmit_dlength(conn);
 692                 break;
 693         default:
 694                 return iscsi_set_param(cls_conn, param, buf, buflen);
 695         }
 696         return err;
 697 }
 698
 699 /**
 700  * cxgb3i_host_set_param - configure host (adapter) related parameters
 701  * @shost:      scsi host pointer
 702  * @param:      parameter type identifier
 703  * @buf:        buffer pointer
 704  */
 705 static int cxgb3i_host_set_param(struct Scsi_Host *shost,
 706                                  enum iscsi_host_param param,
 707                                  char *buf, int buflen)
 708 {
 709         struct cxgb3i_hba *hba = iscsi_host_priv(shost);
 710
 711         if (!hba->ndev) {
 712                 shost_printk(KERN_ERR, shost, "Could not set host param. "
 713                              "Netdev for host not set.\n");
 714                 return -ENODEV;
 715         }
 716
 717         cxgb3i_api_debug("param %d, buf %s.\n", param, buf);
 718
 719         switch (param) {
 720         case ISCSI_HOST_PARAM_IPADDRESS:
 721         {
 722                 __be32 addr = in_aton(buf);
 723                 cxgb3i_set_private_ipv4addr(hba->ndev, addr);
 724                 return 0;
 725         }
 726         case ISCSI_HOST_PARAM_HWADDRESS:
 727         case ISCSI_HOST_PARAM_NETDEV_NAME:
 728                 /* ignore */
 729                 return 0;
 730         default:
 731                 return iscsi_host_set_param(shost, param, buf, buflen);
 732         }
 733 }
 734
 735 /**
 736  * cxgb3i_host_get_param - returns host (adapter) related parameters
 737  * @shost:      scsi host pointer
 738  * @param:      parameter type identifier
 739  * @buf:        buffer pointer
 740  */
 741 static int cxgb3i_host_get_param(struct Scsi_Host *shost,
 742                                  enum iscsi_host_param param, char *buf)
 743 {
 744         struct cxgb3i_hba *hba = iscsi_host_priv(shost);
 745         int len = 0;
 746
 747         if (!hba->ndev) {
 748                 shost_printk(KERN_ERR, shost, "Could not set host param. "
 749                              "Netdev for host not set.\n");
 750                 return -ENODEV;
 751         }
 752
 753         cxgb3i_api_debug("hba %s, param %d.\n", hba->ndev->name, param);
 754
 755         switch (param) {
 756         case ISCSI_HOST_PARAM_HWADDRESS:
 757                 len = sysfs_format_mac(buf, hba->ndev->dev_addr, 6);
 758                 break;
 759         case ISCSI_HOST_PARAM_NETDEV_NAME:
 760                 len = sprintf(buf, "%s\n", hba->ndev->name);
 761                 break;
 762         case ISCSI_HOST_PARAM_IPADDRESS:
 763         {
 764                 __be32 addr;
 765
 766                 addr = cxgb3i_get_private_ipv4addr(hba->ndev);
 767                 len = sprintf(buf, "%pI4", &addr);
 768                 break;
 769         }
 770         default:
 771                 return iscsi_host_get_param(shost, param, buf);
 772         }
 773         return len;
 774 }
 775
 776 /**
 777  * cxgb3i_conn_get_stats - returns iSCSI stats
 778  * @cls_conn:   pointer to iscsi cls conn
 779  * @stats:      pointer to iscsi statistic struct
 780  */
 781 static void cxgb3i_conn_get_stats(struct iscsi_cls_conn *cls_conn,
 782                                   struct iscsi_stats *stats)
 783 {
 784         struct iscsi_conn *conn = cls_conn->dd_data;
 785
 786         stats->txdata_octets = conn->txdata_octets;
 787         stats->rxdata_octets = conn->rxdata_octets;
 788         stats->scsicmd_pdus = conn->scsicmd_pdus_cnt;
 789         stats->dataout_pdus = conn->dataout_pdus_cnt;
 790         stats->scsirsp_pdus = conn->scsirsp_pdus_cnt;
 791         stats->datain_pdus = conn->datain_pdus_cnt;
 792         stats->r2t_pdus = conn->r2t_pdus_cnt;
 793         stats->tmfcmd_pdus = conn->tmfcmd_pdus_cnt;
 794         stats->tmfrsp_pdus = conn->tmfrsp_pdus_cnt;
 795         stats->digest_err = 0;
 796         stats->timeout_err = 0;
 797         stats->custom_length = 1;
 798         strcpy(stats->custom[0].desc, "eh_abort_cnt");
 799         stats->custom[0].value = conn->eh_abort_cnt;
 800 }
 801
 802 /**
 803  * cxgb3i_parse_itt - get the idx and age bits from a given tag
 804  * @conn:       iscsi connection
 805  * @itt:        itt tag
 806  * @idx:        task index, filled in by this function
 807  * @age:        session age, filled in by this function
 808  */
 809 static void cxgb3i_parse_itt(struct iscsi_conn *conn, itt_t itt,
 810                              int *idx, int *age)
 811 {
 812         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
 813         struct cxgb3i_conn *cconn = tcp_conn->dd_data;
 814         struct cxgb3i_adapter *snic = cconn->hba->snic;
 815         u32 tag = ntohl((__force u32) itt);
 816         u32 sw_bits;
 817
 818         sw_bits = cxgb3i_tag_nonrsvd_bits(&snic->tag_format, tag);
 819         if (idx)
 820                 *idx = sw_bits & ((1 << cconn->task_idx_bits) - 1);
 821         if (age)
 822                 *age = (sw_bits >> cconn->task_idx_bits) & ISCSI_AGE_MASK;
 823
 824         cxgb3i_tag_debug("parse tag 0x%x/0x%x, sw 0x%x, itt 0x%x, age 0x%x.\n",
 825                          tag, itt, sw_bits, idx ? *idx : 0xFFFFF,
 826                          age ? *age : 0xFF);
 827 }
 828
 829 /**
 830  * cxgb3i_reserve_itt - generate tag for a give task
 831  * @task: iscsi task
 832  * @hdr_itt: tag, filled in by this function
 833  * Set up ddp for scsi read tasks if possible.
 834  */
 835 int cxgb3i_reserve_itt(struct iscsi_task *task, itt_t *hdr_itt)
 836 {
 837         struct scsi_cmnd *sc = task->sc;
 838         struct iscsi_conn *conn = task->conn;
 839         struct iscsi_session *sess = conn->session;
 840         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
 841         struct cxgb3i_conn *cconn = tcp_conn->dd_data;
 842         struct cxgb3i_adapter *snic = cconn->hba->snic;
 843         struct cxgb3i_tag_format *tformat = &snic->tag_format;
 844         u32 sw_tag = (sess->age << cconn->task_idx_bits) | task->itt;
 845         u32 tag;
 846         int err = -EINVAL;
 847
 848         if (sc &&
 849             (scsi_bidi_cmnd(sc) || sc->sc_data_direction == DMA_FROM_DEVICE) &&
 850             cxgb3i_sw_tag_usable(tformat, sw_tag)) {
 851                 struct s3_conn *c3cn = cconn->cep->c3cn;
 852                 struct cxgb3i_gather_list *gl;
 853
 854                 gl = cxgb3i_ddp_make_gl(scsi_in(sc)->length,
 855                                         scsi_in(sc)->table.sgl,
 856                                         scsi_in(sc)->table.nents,
 857                                         snic->pdev,
 858                                         GFP_ATOMIC);
 859                 if (gl) {
 860                         tag = sw_tag;
 861                         err = cxgb3i_ddp_tag_reserve(snic->tdev, c3cn->tid,
 862                                                      tformat, &tag,
 863                                                      gl, GFP_ATOMIC);
 864                         if (err < 0)
 865                                 cxgb3i_ddp_release_gl(gl, snic->pdev);
 866                 }
 867         }
 868
 869         if (err < 0)
 870                 tag = cxgb3i_set_non_ddp_tag(tformat, sw_tag);
 871         /* the itt need to sent in big-endian order */
 872         *hdr_itt = (__force itt_t)htonl(tag);
 873
 874         cxgb3i_tag_debug("new tag 0x%x/0x%x (itt 0x%x, age 0x%x).\n",
 875                          tag, *hdr_itt, task->itt, sess->age);
 876         return 0;
 877 }
 878
 879 /**
 880  * cxgb3i_release_itt - release the tag for a given task
 881  * @task:       iscsi task
 882  * @hdr_itt:    tag
 883  * If the tag is a ddp tag, release the ddp setup
 884  */
 885 void cxgb3i_release_itt(struct iscsi_task *task, itt_t hdr_itt)
 886 {
 887         struct scsi_cmnd *sc = task->sc;
 888         struct iscsi_tcp_conn *tcp_conn = task->conn->dd_data;
 889         struct cxgb3i_conn *cconn = tcp_conn->dd_data;
 890         struct cxgb3i_adapter *snic = cconn->hba->snic;
 891         struct cxgb3i_tag_format *tformat = &snic->tag_format;
 892         u32 tag = ntohl((__force u32)hdr_itt);
 893
 894         cxgb3i_tag_debug("release tag 0x%x.\n", tag);
 895
 896         if (sc &&
 897             (scsi_bidi_cmnd(sc) || sc->sc_data_direction == DMA_FROM_DEVICE) &&
 898             cxgb3i_is_ddp_tag(tformat, tag))
 899                 cxgb3i_ddp_tag_release(snic->tdev, tag);
 900 }
 901
 902 /**
 903  * cxgb3i_host_template -- Scsi_Host_Template structure
 904  *      used when registering with the scsi mid layer
 905  */
 906 static struct scsi_host_template cxgb3i_host_template = {
 907         .module                 = THIS_MODULE,
 908         .name                   = "Chelsio S3xx iSCSI Initiator",
 909         .proc_name              = "cxgb3i",
 910         .queuecommand           = iscsi_queuecommand,
 911         .change_queue_depth     = iscsi_change_queue_depth,
 912         .can_queue              = CXGB3I_SCSI_HOST_QDEPTH,
 913         .sg_tablesize           = SG_ALL,
 914         .max_sectors            = 0xFFFF,
 915         .cmd_per_lun            = ISCSI_DEF_CMD_PER_LUN,
 916         .eh_abort_handler       = iscsi_eh_abort,
 917         .eh_device_reset_handler = iscsi_eh_device_reset,
 918         .eh_target_reset_handler = iscsi_eh_recover_target,
 919         .target_alloc           = iscsi_target_alloc,
 920         .use_clustering         = DISABLE_CLUSTERING,
 921         .this_id                = -1,
 922 };
 923
 924 static struct iscsi_transport cxgb3i_iscsi_transport = {
 925         .owner                  = THIS_MODULE,
 926         .name                   = "cxgb3i",
 927         .caps                   = CAP_RECOVERY_L0 | CAP_MULTI_R2T | CAP_HDRDGST
 928                                 | CAP_DATADGST | CAP_DIGEST_OFFLOAD |
 929                                 CAP_PADDING_OFFLOAD,
 930         .param_mask             = ISCSI_MAX_RECV_DLENGTH |
 931                                 ISCSI_MAX_XMIT_DLENGTH |
 932                                 ISCSI_HDRDGST_EN |
 933                                 ISCSI_DATADGST_EN |
 934                                 ISCSI_INITIAL_R2T_EN |
 935                                 ISCSI_MAX_R2T |
 936                                 ISCSI_IMM_DATA_EN |
 937                                 ISCSI_FIRST_BURST |
 938                                 ISCSI_MAX_BURST |
 939                                 ISCSI_PDU_INORDER_EN |
 940                                 ISCSI_DATASEQ_INORDER_EN |
 941                                 ISCSI_ERL |
 942                                 ISCSI_CONN_PORT |
 943                                 ISCSI_CONN_ADDRESS |
 944                                 ISCSI_EXP_STATSN |
 945                                 ISCSI_PERSISTENT_PORT |
 946                                 ISCSI_PERSISTENT_ADDRESS |
 947                                 ISCSI_TARGET_NAME | ISCSI_TPGT |
 948                                 ISCSI_USERNAME | ISCSI_PASSWORD |
 949                                 ISCSI_USERNAME_IN | ISCSI_PASSWORD_IN |
 950                                 ISCSI_FAST_ABORT | ISCSI_ABORT_TMO |
 951                                 ISCSI_LU_RESET_TMO | ISCSI_TGT_RESET_TMO |
 952                                 ISCSI_PING_TMO | ISCSI_RECV_TMO |
 953                                 ISCSI_IFACE_NAME | ISCSI_INITIATOR_NAME,
 954         .host_param_mask        = ISCSI_HOST_HWADDRESS | ISCSI_HOST_IPADDRESS |
 955                         ISCSI_HOST_INITIATOR_NAME | ISCSI_HOST_NETDEV_NAME,
 956         .get_host_param         = cxgb3i_host_get_param,
 957         .set_host_param         = cxgb3i_host_set_param,
 958         /* session management */
 959         .create_session         = cxgb3i_session_create,
 960         .destroy_session        = cxgb3i_session_destroy,
 961         .get_session_param      = iscsi_session_get_param,
 962         /* connection management */
 963         .create_conn            = cxgb3i_conn_create,
 964         .bind_conn              = cxgb3i_conn_bind,
 965         .destroy_conn           = iscsi_tcp_conn_teardown,
 966         .start_conn             = iscsi_conn_start,
 967         .stop_conn              = iscsi_conn_stop,
 968         .get_conn_param         = cxgb3i_conn_get_param,
 969         .set_param              = cxgb3i_conn_set_param,
 970         .get_stats              = cxgb3i_conn_get_stats,
 971         /* pdu xmit req. from user space */
 972         .send_pdu               = iscsi_conn_send_pdu,
 973         /* task */
 974         .init_task              = iscsi_tcp_task_init,
 975         .xmit_task              = iscsi_tcp_task_xmit,
 976         .cleanup_task           = cxgb3i_conn_cleanup_task,
 977
 978         /* pdu */
 979         .alloc_pdu              = cxgb3i_conn_alloc_pdu,
 980         .init_pdu               = cxgb3i_conn_init_pdu,
 981         .xmit_pdu               = cxgb3i_conn_xmit_pdu,
 982         .parse_pdu_itt          = cxgb3i_parse_itt,
 983
 984         /* TCP connect/disconnect */
 985         .ep_connect             = cxgb3i_ep_connect,
 986         .ep_poll                = cxgb3i_ep_poll,
 987         .ep_disconnect          = cxgb3i_ep_disconnect,
 988         /* Error recovery timeout call */
 989         .session_recovery_timedout = iscsi_session_recovery_timedout,
 990 };
 991
 992 int cxgb3i_iscsi_init(void)
 993 {
 994         sw_tag_idx_bits = (__ilog2_u32(ISCSI_ITT_MASK)) + 1;
 995         sw_tag_age_bits = (__ilog2_u32(ISCSI_AGE_MASK)) + 1;
 996         cxgb3i_log_info("tag itt 0x%x, %u bits, age 0x%x, %u bits.\n",
 997                         ISCSI_ITT_MASK, sw_tag_idx_bits,
 998                         ISCSI_AGE_MASK, sw_tag_age_bits);
 999
1000         cxgb3i_scsi_transport =
1001             iscsi_register_transport(&cxgb3i_iscsi_transport);
1002         if (!cxgb3i_scsi_transport) {
1003                 cxgb3i_log_error("Could not register cxgb3i transport.\n");
1004                 return -ENODEV;
1005         }
1006         cxgb3i_api_debug("cxgb3i transport 0x%p.\n", cxgb3i_scsi_transport);
1007         return 0;
1008 }
1009
1010 void cxgb3i_iscsi_cleanup(void)
1011 {
1012         if (cxgb3i_scsi_transport) {
1013                 cxgb3i_api_debug("cxgb3i transport 0x%p.\n",
1014                                  cxgb3i_scsi_transport);
1015                 iscsi_unregister_transport(&cxgb3i_iscsi_transport);
1016         }
1017 }