drivers/scsi/cxgb3i/cxgb3i_iscsi.c

   1 /* cxgb3i_iscsi.c: Chelsio S3xx iSCSI driver.
   2  *
   3  * Copyright (c) 2008 Chelsio Communications, Inc.
   4  * Copyright (c) 2008 Mike Christie
   5  * Copyright (c) 2008 Red Hat, Inc.  All rights reserved.
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation.
  10  *
  11  * Written by: Karen Xie (kxie@chelsio.com)
  12  */
  13
  14 #include <linux/inet.h>
  15 #include <linux/crypto.h>
  16 #include <net/tcp.h>
  17 #include <scsi/scsi_cmnd.h>
  18 #include <scsi/scsi_device.h>
  19 #include <scsi/scsi_eh.h>
  20 #include <scsi/scsi_host.h>
  21 #include <scsi/scsi.h>
  22 #include <scsi/iscsi_proto.h>
  23 #include <scsi/libiscsi.h>
  24 #include <scsi/scsi_transport_iscsi.h>
  25
  26 #include "cxgb3i.h"
  27 #include "cxgb3i_pdu.h"
  28
  29 #ifdef __DEBUG_CXGB3I_TAG__
  30 #define cxgb3i_tag_debug        cxgb3i_log_debug
  31 #else
  32 #define cxgb3i_tag_debug(fmt...)
  33 #endif
  34
  35 #ifdef __DEBUG_CXGB3I_API__
  36 #define cxgb3i_api_debug        cxgb3i_log_debug
  37 #else
  38 #define cxgb3i_api_debug(fmt...)
  39 #endif
  40
  41 /*
  42  * align pdu size to multiple of 512 for better performance
  43  */
  44 #define align_pdu_size(n) do { n = (n) & (~511); } while (0)
  45
  46 static struct scsi_transport_template *cxgb3i_scsi_transport;
  47 static struct scsi_host_template cxgb3i_host_template;
  48 static struct iscsi_transport cxgb3i_iscsi_transport;
  49 static unsigned char sw_tag_idx_bits;
  50 static unsigned char sw_tag_age_bits;
  51
  52 static LIST_HEAD(cxgb3i_snic_list);
  53 static DEFINE_RWLOCK(cxgb3i_snic_rwlock);
  54
  55 /**
  56  * cxgb3i_adapter_add - init a s3 adapter structure and any h/w settings
  57  * @t3dev: t3cdev adapter
  58  * return the resulting cxgb3i_adapter struct
  59  */
  60 struct cxgb3i_adapter *cxgb3i_adapter_add(struct t3cdev *t3dev)
  61 {
  62         struct cxgb3i_adapter *snic;
  63         struct adapter *adapter = tdev2adap(t3dev);
  64         int i;
  65
  66         snic = kzalloc(sizeof(*snic), GFP_KERNEL);
  67         if (!snic) {
  68                 cxgb3i_api_debug("cxgb3 %s, OOM.\n", t3dev->name);
  69                 return NULL;
  70         }
  71         spin_lock_init(&snic->lock);
  72
  73         snic->tdev = t3dev;
  74         snic->pdev = adapter->pdev;
  75         snic->tag_format.sw_bits = sw_tag_idx_bits + sw_tag_age_bits;
  76
  77         if (cxgb3i_adapter_ddp_init(t3dev, &snic->tag_format,
  78                                     &snic->tx_max_size,
  79                                     &snic->rx_max_size) < 0)
  80                 goto free_snic;
  81
  82         for_each_port(adapter, i) {
  83                 snic->hba[i] = cxgb3i_hba_host_add(snic, adapter->port[i]);
  84                 if (!snic->hba[i])
  85                         goto ulp_cleanup;
  86         }
  87         snic->hba_cnt = adapter->params.nports;
  88
  89         /* add to the list */
  90         write_lock(&cxgb3i_snic_rwlock);
  91         list_add_tail(&snic->list_head, &cxgb3i_snic_list);
  92         write_unlock(&cxgb3i_snic_rwlock);
  93
  94         return snic;
  95
  96 ulp_cleanup:
  97         cxgb3i_adapter_ddp_cleanup(t3dev);
  98 free_snic:
  99         kfree(snic);
 100         return NULL;
 101 }
 102
 103 /**
 104  * cxgb3i_adapter_remove - release all the resources held and cleanup any
 105  *      h/w settings
 106  * @t3dev: t3cdev adapter
 107  */
 108 void cxgb3i_adapter_remove(struct t3cdev *t3dev)
 109 {
 110         int i;
 111         struct cxgb3i_adapter *snic;
 112
 113         /* remove from the list */
 114         write_lock(&cxgb3i_snic_rwlock);
 115         list_for_each_entry(snic, &cxgb3i_snic_list, list_head) {
 116                 if (snic->tdev == t3dev) {
 117                         list_del(&snic->list_head);
 118                         break;
 119                 }
 120         }
 121         write_unlock(&cxgb3i_snic_rwlock);
 122
 123         if (snic) {
 124                 for (i = 0; i < snic->hba_cnt; i++) {
 125                         if (snic->hba[i]) {
 126                                 cxgb3i_hba_host_remove(snic->hba[i]);
 127                                 snic->hba[i] = NULL;
 128                         }
 129                 }
 130
 131                 /* release ddp resources */
 132                 cxgb3i_adapter_ddp_cleanup(snic->tdev);
 133                 kfree(snic);
 134         }
 135 }
 136
 137 /**
 138  * cxgb3i_hba_find_by_netdev - find the cxgb3i_hba structure with a given
 139  *      net_device
 140  * @t3dev: t3cdev adapter
 141  */
 142 struct cxgb3i_hba *cxgb3i_hba_find_by_netdev(struct net_device *ndev)
 143 {
 144         struct cxgb3i_adapter *snic;
 145         int i;
 146
 147         read_lock(&cxgb3i_snic_rwlock);
 148         list_for_each_entry(snic, &cxgb3i_snic_list, list_head) {
 149                 for (i = 0; i < snic->hba_cnt; i++) {
 150                         if (snic->hba[i]->ndev == ndev) {
 151                                 read_unlock(&cxgb3i_snic_rwlock);
 152                                 return snic->hba[i];
 153                         }
 154                 }
 155         }
 156         read_unlock(&cxgb3i_snic_rwlock);
 157         return NULL;
 158 }
 159
 160 /**
 161  * cxgb3i_hba_host_add - register a new host with scsi/iscsi
 162  * @snic: the cxgb3i adapter
 163  * @ndev: associated net_device
 164  */
 165 struct cxgb3i_hba *cxgb3i_hba_host_add(struct cxgb3i_adapter *snic,
 166                                        struct net_device *ndev)
 167 {
 168         struct cxgb3i_hba *hba;
 169         struct Scsi_Host *shost;
 170         int err;
 171
 172         shost = iscsi_host_alloc(&cxgb3i_host_template,
 173                                  sizeof(struct cxgb3i_hba),
 174                                  CXGB3I_SCSI_QDEPTH_DFLT);
 175         if (!shost) {
 176                 cxgb3i_log_info("iscsi_host_alloc failed.\n");
 177                 return NULL;
 178         }
 179
 180         shost->transportt = cxgb3i_scsi_transport;
 181         shost->max_lun = CXGB3I_MAX_LUN;
 182         shost->max_id = CXGB3I_MAX_TARGET;
 183         shost->max_channel = 0;
 184         shost->max_cmd_len = 16;
 185
 186         hba = iscsi_host_priv(shost);
 187         hba->snic = snic;
 188         hba->ndev = ndev;
 189         hba->shost = shost;
 190
 191         pci_dev_get(snic->pdev);
 192         err = iscsi_host_add(shost, &snic->pdev->dev);
 193         if (err) {
 194                 cxgb3i_log_info("iscsi_host_add failed.\n");
 195                 goto pci_dev_put;
 196         }
 197
 198         cxgb3i_api_debug("shost 0x%p, hba 0x%p, no %u.\n",
 199                          shost, hba, shost->host_no);
 200
 201         return hba;
 202
 203 pci_dev_put:
 204         pci_dev_put(snic->pdev);
 205         scsi_host_put(shost);
 206         return NULL;
 207 }
 208
 209 /**
 210  * cxgb3i_hba_host_remove - de-register the host with scsi/iscsi
 211  * @hba: the cxgb3i hba
 212  */
 213 void cxgb3i_hba_host_remove(struct cxgb3i_hba *hba)
 214 {
 215         cxgb3i_api_debug("shost 0x%p, hba 0x%p, no %u.\n",
 216                          hba->shost, hba, hba->shost->host_no);
 217         iscsi_host_remove(hba->shost);
 218         pci_dev_put(hba->snic->pdev);
 219         iscsi_host_free(hba->shost);
 220 }
 221
 222 /**
 223  * cxgb3i_ep_connect - establish TCP connection to target portal
 224  * @dst_addr:           target IP address
 225  * @non_blocking:       blocking or non-blocking call
 226  *
 227  * Initiates a TCP/IP connection to the dst_addr
 228  */
 229 static struct iscsi_endpoint *cxgb3i_ep_connect(struct sockaddr *dst_addr,
 230                                                 int non_blocking)
 231 {
 232         struct iscsi_endpoint *ep;
 233         struct cxgb3i_endpoint *cep;
 234         struct cxgb3i_hba *hba;
 235         struct s3_conn *c3cn = NULL;
 236         int err = 0;
 237
 238         c3cn = cxgb3i_c3cn_create();
 239         if (!c3cn) {
 240                 cxgb3i_log_info("ep connect OOM.\n");
 241                 err = -ENOMEM;
 242                 goto release_conn;
 243         }
 244
 245         err = cxgb3i_c3cn_connect(c3cn, (struct sockaddr_in *)dst_addr);
 246         if (err < 0) {
 247                 cxgb3i_log_info("ep connect failed.\n");
 248                 goto release_conn;
 249         }
 250         hba = cxgb3i_hba_find_by_netdev(c3cn->dst_cache->dev);
 251         if (!hba) {
 252                 err = -ENOSPC;
 253                 cxgb3i_log_info("NOT going through cxgbi device.\n");
 254                 goto release_conn;
 255         }
 256         if (c3cn_is_closing(c3cn)) {
 257                 err = -ENOSPC;
 258                 cxgb3i_log_info("ep connect unable to connect.\n");
 259                 goto release_conn;
 260         }
 261
 262         ep = iscsi_create_endpoint(sizeof(*cep));
 263         if (!ep) {
 264                 err = -ENOMEM;
 265                 cxgb3i_log_info("iscsi alloc ep, OOM.\n");
 266                 goto release_conn;
 267         }
 268         cep = ep->dd_data;
 269         cep->c3cn = c3cn;
 270         cep->hba = hba;
 271
 272         cxgb3i_api_debug("ep 0x%p, 0x%p, c3cn 0x%p, hba 0x%p.\n",
 273                           ep, cep, c3cn, hba);
 274         return ep;
 275
 276 release_conn:
 277         cxgb3i_api_debug("conn 0x%p failed, release.\n", c3cn);
 278         if (c3cn)
 279                 cxgb3i_c3cn_release(c3cn);
 280         return ERR_PTR(err);
 281 }
 282
 283 /**
 284  * cxgb3i_ep_poll - polls for TCP connection establishement
 285  * @ep:         TCP connection (endpoint) handle
 286  * @timeout_ms: timeout value in milli secs
 287  *
 288  * polls for TCP connect request to complete
 289  */
 290 static int cxgb3i_ep_poll(struct iscsi_endpoint *ep, int timeout_ms)
 291 {
 292         struct cxgb3i_endpoint *cep = ep->dd_data;
 293         struct s3_conn *c3cn = cep->c3cn;
 294
 295         if (!c3cn_is_established(c3cn))
 296                 return 0;
 297         cxgb3i_api_debug("ep 0x%p, c3cn 0x%p established.\n", ep, c3cn);
 298         return 1;
 299 }
 300
 301 /**
 302  * cxgb3i_ep_disconnect - teardown TCP connection
 303  * @ep:         TCP connection (endpoint) handle
 304  *
 305  * teardown TCP connection
 306  */
 307 static void cxgb3i_ep_disconnect(struct iscsi_endpoint *ep)
 308 {
 309         struct cxgb3i_endpoint *cep = ep->dd_data;
 310         struct cxgb3i_conn *cconn = cep->cconn;
 311
 312         cxgb3i_api_debug("ep 0x%p, cep 0x%p.\n", ep, cep);
 313
 314         if (cconn && cconn->conn) {
 315                 /*
 316                  * stop the xmit path so the xmit_pdu function is
 317                  * not being called
 318                  */
 319                 iscsi_suspend_tx(cconn->conn);
 320
 321                 write_lock_bh(&cep->c3cn->callback_lock);
 322                 cep->c3cn->user_data = NULL;
 323                 cconn->cep = NULL;
 324                 write_unlock_bh(&cep->c3cn->callback_lock);
 325         }
 326
 327         cxgb3i_api_debug("ep 0x%p, cep 0x%p, release c3cn 0x%p.\n",
 328                          ep, cep, cep->c3cn);
 329         cxgb3i_c3cn_release(cep->c3cn);
 330         iscsi_destroy_endpoint(ep);
 331 }
 332
 333 /**
 334  * cxgb3i_session_create - create a new iscsi session
 335  * @cmds_max:           max # of commands
 336  * @qdepth:             scsi queue depth
 337  * @initial_cmdsn:      initial iscsi CMDSN for this session
 338  * @host_no:            pointer to return host no
 339  *
 340  * Creates a new iSCSI session
 341  */
 342 static struct iscsi_cls_session *
 343 cxgb3i_session_create(struct iscsi_endpoint *ep, u16 cmds_max, u16 qdepth,
 344                       u32 initial_cmdsn, u32 *host_no)
 345 {
 346         struct cxgb3i_endpoint *cep;
 347         struct cxgb3i_hba *hba;
 348         struct Scsi_Host *shost;
 349         struct iscsi_cls_session *cls_session;
 350         struct iscsi_session *session;
 351
 352         if (!ep) {
 353                 cxgb3i_log_error("%s, missing endpoint.\n", __func__);
 354                 return NULL;
 355         }
 356
 357         cep = ep->dd_data;
 358         hba = cep->hba;
 359         shost = hba->shost;
 360         cxgb3i_api_debug("ep 0x%p, cep 0x%p, hba 0x%p.\n", ep, cep, hba);
 361         BUG_ON(hba != iscsi_host_priv(shost));
 362
 363         *host_no = shost->host_no;
 364
 365         cls_session = iscsi_session_setup(&cxgb3i_iscsi_transport, shost,
 366                                           cmds_max,
 367                                           sizeof(struct iscsi_tcp_task),
 368                                           initial_cmdsn, ISCSI_MAX_TARGET);
 369         if (!cls_session)
 370                 return NULL;
 371         session = cls_session->dd_data;
 372         if (iscsi_tcp_r2tpool_alloc(session))
 373                 goto remove_session;
 374
 375         return cls_session;
 376
 377 remove_session:
 378         iscsi_session_teardown(cls_session);
 379         return NULL;
 380 }
 381
 382 /**
 383  * cxgb3i_session_destroy - destroys iscsi session
 384  * @cls_session:        pointer to iscsi cls session
 385  *
 386  * Destroys an iSCSI session instance and releases its all resources held
 387  */
 388 static void cxgb3i_session_destroy(struct iscsi_cls_session *cls_session)
 389 {
 390         cxgb3i_api_debug("sess 0x%p.\n", cls_session);
 391         iscsi_tcp_r2tpool_free(cls_session->dd_data);
 392         iscsi_session_teardown(cls_session);
 393 }
 394
 395 /**
 396  * cxgb3i_conn_max_xmit_dlength -- check the max. xmit pdu segment size,
 397  * reduce it to be within the hardware limit if needed
 398  * @conn: iscsi connection
 399  */
 400 static inline int cxgb3i_conn_max_xmit_dlength(struct iscsi_conn *conn)
 401
 402 {
 403         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
 404         struct cxgb3i_conn *cconn = tcp_conn->dd_data;
 405         unsigned int max = min_t(unsigned int, ULP2_MAX_PDU_PAYLOAD,
 406                                  cconn->hba->snic->tx_max_size -
 407                                  ISCSI_PDU_NONPAYLOAD_MAX);
 408
 409         if (conn->max_xmit_dlength)
 410                 conn->max_xmit_dlength = min_t(unsigned int,
 411                                                 conn->max_xmit_dlength, max);
 412         else
 413                 conn->max_xmit_dlength = max;
 414         align_pdu_size(conn->max_xmit_dlength);
 415         cxgb3i_log_info("conn 0x%p, max xmit %u.\n",
 416                          conn, conn->max_xmit_dlength);
 417         return 0;
 418 }
 419
 420 /**
 421  * cxgb3i_conn_max_recv_dlength -- check the max. recv pdu segment size against
 422  * the hardware limit
 423  * @conn: iscsi connection
 424  * return 0 if the value is valid, < 0 otherwise.
 425  */
 426 static inline int cxgb3i_conn_max_recv_dlength(struct iscsi_conn *conn)
 427 {
 428         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
 429         struct cxgb3i_conn *cconn = tcp_conn->dd_data;
 430         unsigned int max = min_t(unsigned int, ULP2_MAX_PDU_PAYLOAD,
 431                                  cconn->hba->snic->rx_max_size -
 432                                  ISCSI_PDU_NONPAYLOAD_MAX);
 433
 434         align_pdu_size(max);
 435         if (conn->max_recv_dlength) {
 436                 if (conn->max_recv_dlength > max) {
 437                         cxgb3i_log_error("MaxRecvDataSegmentLength %u too big."
 438                                          " Need to be <= %u.\n",
 439                                          conn->max_recv_dlength, max);
 440                         return -EINVAL;
 441                 }
 442                 conn->max_recv_dlength = min_t(unsigned int,
 443                                                 conn->max_recv_dlength, max);
 444                 align_pdu_size(conn->max_recv_dlength);
 445         } else
 446                 conn->max_recv_dlength = max;
 447         cxgb3i_api_debug("conn 0x%p, max recv %u.\n",
 448                          conn, conn->max_recv_dlength);
 449         return 0;
 450 }
 451
 452 /**
 453  * cxgb3i_conn_create - create iscsi connection instance
 454  * @cls_session:        pointer to iscsi cls session
 455  * @cid:                iscsi cid
 456  *
 457  * Creates a new iSCSI connection instance for a given session
 458  */
 459 static struct iscsi_cls_conn *cxgb3i_conn_create(struct iscsi_cls_session
 460                                                  *cls_session, u32 cid)
 461 {
 462         struct iscsi_cls_conn *cls_conn;
 463         struct iscsi_conn *conn;
 464         struct iscsi_tcp_conn *tcp_conn;
 465         struct cxgb3i_conn *cconn;
 466
 467         cxgb3i_api_debug("sess 0x%p, cid %u.\n", cls_session, cid);
 468
 469         cls_conn = iscsi_tcp_conn_setup(cls_session, sizeof(*cconn), cid);
 470         if (!cls_conn)
 471                 return NULL;
 472         conn = cls_conn->dd_data;
 473         tcp_conn = conn->dd_data;
 474         cconn = tcp_conn->dd_data;
 475
 476         cconn->conn = conn;
 477         return cls_conn;
 478 }
 479
 480 /**
 481  * cxgb3i_conn_bind - binds iscsi sess, conn and endpoint together
 482  * @cls_session:        pointer to iscsi cls session
 483  * @cls_conn:           pointer to iscsi cls conn
 484  * @transport_eph:      64-bit EP handle
 485  * @is_leading:         leading connection on this session?
 486  *
 487  * Binds together an iSCSI session, an iSCSI connection and a
 488  *      TCP connection. This routine returns error code if the TCP
 489  *      connection does not belong on the device iSCSI sess/conn is bound
 490  */
 491
 492 static int cxgb3i_conn_bind(struct iscsi_cls_session *cls_session,
 493                             struct iscsi_cls_conn *cls_conn,
 494                             u64 transport_eph, int is_leading)
 495 {
 496         struct iscsi_conn *conn = cls_conn->dd_data;
 497         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
 498         struct cxgb3i_conn *cconn = tcp_conn->dd_data;
 499         struct cxgb3i_adapter *snic;
 500         struct iscsi_endpoint *ep;
 501         struct cxgb3i_endpoint *cep;
 502         struct s3_conn *c3cn;
 503         int err;
 504
 505         ep = iscsi_lookup_endpoint(transport_eph);
 506         if (!ep)
 507                 return -EINVAL;
 508
 509         /* setup ddp pagesize */
 510         cep = ep->dd_data;
 511         c3cn = cep->c3cn;
 512         snic = cep->hba->snic;
 513         err = cxgb3i_setup_conn_host_pagesize(snic->tdev, c3cn->tid, 0);
 514         if (err < 0)
 515                 return err;
 516
 517         cxgb3i_api_debug("ep 0x%p, cls sess 0x%p, cls conn 0x%p.\n",
 518                          ep, cls_session, cls_conn);
 519
 520         err = iscsi_conn_bind(cls_session, cls_conn, is_leading);
 521         if (err)
 522                 return -EINVAL;
 523
 524         /* calculate the tag idx bits needed for this conn based on cmds_max */
 525         cconn->task_idx_bits = (__ilog2_u32(conn->session->cmds_max - 1)) + 1;
 526         cxgb3i_api_debug("session cmds_max 0x%x, bits %u.\n",
 527                          conn->session->cmds_max, cconn->task_idx_bits);
 528
 529         read_lock(&c3cn->callback_lock);
 530         c3cn->user_data = conn;
 531         cconn->hba = cep->hba;
 532         cconn->cep = cep;
 533         cep->cconn = cconn;
 534         read_unlock(&c3cn->callback_lock);
 535
 536         cxgb3i_conn_max_xmit_dlength(conn);
 537         cxgb3i_conn_max_recv_dlength(conn);
 538
 539         spin_lock_bh(&conn->session->lock);
 540         sprintf(conn->portal_address, NIPQUAD_FMT,
 541                 NIPQUAD(c3cn->daddr.sin_addr.s_addr));
 542         conn->portal_port = ntohs(c3cn->daddr.sin_port);
 543         spin_unlock_bh(&conn->session->lock);
 544
 545         /* init recv engine */
 546         iscsi_tcp_hdr_recv_prep(tcp_conn);
 547
 548         return 0;
 549 }
 550
 551 /**
 552  * cxgb3i_conn_get_param - return iscsi connection parameter to caller
 553  * @cls_conn:   pointer to iscsi cls conn
 554  * @param:      parameter type identifier
 555  * @buf:        buffer pointer
 556  *
 557  * returns iSCSI connection parameters
 558  */
 559 static int cxgb3i_conn_get_param(struct iscsi_cls_conn *cls_conn,
 560                                  enum iscsi_param param, char *buf)
 561 {
 562         struct iscsi_conn *conn = cls_conn->dd_data;
 563         int len;
 564
 565         cxgb3i_api_debug("cls_conn 0x%p, param %d.\n", cls_conn, param);
 566
 567         switch (param) {
 568         case ISCSI_PARAM_CONN_PORT:
 569                 spin_lock_bh(&conn->session->lock);
 570                 len = sprintf(buf, "%hu\n", conn->portal_port);
 571                 spin_unlock_bh(&conn->session->lock);
 572                 break;
 573         case ISCSI_PARAM_CONN_ADDRESS:
 574                 spin_lock_bh(&conn->session->lock);
 575                 len = sprintf(buf, "%s\n", conn->portal_address);
 576                 spin_unlock_bh(&conn->session->lock);
 577                 break;
 578         default:
 579                 return iscsi_conn_get_param(cls_conn, param, buf);
 580         }
 581
 582         return len;
 583 }
 584
 585 /**
 586  * cxgb3i_conn_set_param - set iscsi connection parameter
 587  * @cls_conn:   pointer to iscsi cls conn
 588  * @param:      parameter type identifier
 589  * @buf:        buffer pointer
 590  * @buflen:     buffer length
 591  *
 592  * set iSCSI connection parameters
 593  */
 594 static int cxgb3i_conn_set_param(struct iscsi_cls_conn *cls_conn,
 595                                  enum iscsi_param param, char *buf, int buflen)
 596 {
 597         struct iscsi_conn *conn = cls_conn->dd_data;
 598         struct iscsi_session *session = conn->session;
 599         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
 600         struct cxgb3i_conn *cconn = tcp_conn->dd_data;
 601         struct cxgb3i_adapter *snic = cconn->hba->snic;
 602         struct s3_conn *c3cn = cconn->cep->c3cn;
 603         int value, err = 0;
 604
 605         switch (param) {
 606         case ISCSI_PARAM_HDRDGST_EN:
 607                 err = iscsi_set_param(cls_conn, param, buf, buflen);
 608                 if (!err && conn->hdrdgst_en)
 609                         err = cxgb3i_setup_conn_digest(snic->tdev, c3cn->tid,
 610                                                         conn->hdrdgst_en,
 611                                                         conn->datadgst_en, 0);
 612                 break;
 613         case ISCSI_PARAM_DATADGST_EN:
 614                 err = iscsi_set_param(cls_conn, param, buf, buflen);
 615                 if (!err && conn->datadgst_en)
 616                         err = cxgb3i_setup_conn_digest(snic->tdev, c3cn->tid,
 617                                                         conn->hdrdgst_en,
 618                                                         conn->datadgst_en, 0);
 619                 break;
 620         case ISCSI_PARAM_MAX_R2T:
 621                 sscanf(buf, "%d", &value);
 622                 if (value <= 0 || !is_power_of_2(value))
 623                         return -EINVAL;
 624                 if (session->max_r2t == value)
 625                         break;
 626                 iscsi_tcp_r2tpool_free(session);
 627                 err = iscsi_set_param(cls_conn, param, buf, buflen);
 628                 if (!err && iscsi_tcp_r2tpool_alloc(session))
 629                         return -ENOMEM;
 630         case ISCSI_PARAM_MAX_RECV_DLENGTH:
 631                 err = iscsi_set_param(cls_conn, param, buf, buflen);
 632                 if (!err)
 633                         err = cxgb3i_conn_max_recv_dlength(conn);
 634                 break;
 635         case ISCSI_PARAM_MAX_XMIT_DLENGTH:
 636                 err = iscsi_set_param(cls_conn, param, buf, buflen);
 637                 if (!err)
 638                         err = cxgb3i_conn_max_xmit_dlength(conn);
 639                 break;
 640         default:
 641                 return iscsi_set_param(cls_conn, param, buf, buflen);
 642         }
 643         return err;
 644 }
 645
 646 /**
 647  * cxgb3i_host_set_param - configure host (adapter) related parameters
 648  * @shost:      scsi host pointer
 649  * @param:      parameter type identifier
 650  * @buf:        buffer pointer
 651  */
 652 static int cxgb3i_host_set_param(struct Scsi_Host *shost,
 653                                  enum iscsi_host_param param,
 654                                  char *buf, int buflen)
 655 {
 656         struct cxgb3i_hba *hba = iscsi_host_priv(shost);
 657
 658         cxgb3i_api_debug("param %d, buf %s.\n", param, buf);
 659
 660         switch (param) {
 661         case ISCSI_HOST_PARAM_IPADDRESS:
 662         {
 663                 __be32 addr = in_aton(buf);
 664                 cxgb3i_set_private_ipv4addr(hba->ndev, addr);
 665                 return 0;
 666         }
 667         case ISCSI_HOST_PARAM_HWADDRESS:
 668         case ISCSI_HOST_PARAM_NETDEV_NAME:
 669                 /* ignore */
 670                 return 0;
 671         default:
 672                 return iscsi_host_set_param(shost, param, buf, buflen);
 673         }
 674 }
 675
 676 /**
 677  * cxgb3i_host_get_param - returns host (adapter) related parameters
 678  * @shost:      scsi host pointer
 679  * @param:      parameter type identifier
 680  * @buf:        buffer pointer
 681  */
 682 static int cxgb3i_host_get_param(struct Scsi_Host *shost,
 683                                  enum iscsi_host_param param, char *buf)
 684 {
 685         struct cxgb3i_hba *hba = iscsi_host_priv(shost);
 686         int len = 0;
 687
 688         cxgb3i_api_debug("hba %s, param %d.\n", hba->ndev->name, param);
 689
 690         switch (param) {
 691         case ISCSI_HOST_PARAM_HWADDRESS:
 692                 len = sysfs_format_mac(buf, hba->ndev->dev_addr, 6);
 693                 break;
 694         case ISCSI_HOST_PARAM_NETDEV_NAME:
 695                 len = sprintf(buf, "%s\n", hba->ndev->name);
 696                 break;
 697         case ISCSI_HOST_PARAM_IPADDRESS:
 698         {
 699                 __be32 addr;
 700
 701                 addr = cxgb3i_get_private_ipv4addr(hba->ndev);
 702                 len = sprintf(buf, NIPQUAD_FMT, NIPQUAD(addr));
 703                 break;
 704         }
 705         default:
 706                 return iscsi_host_get_param(shost, param, buf);
 707         }
 708         return len;
 709 }
 710
 711 /**
 712  * cxgb3i_conn_get_stats - returns iSCSI stats
 713  * @cls_conn:   pointer to iscsi cls conn
 714  * @stats:      pointer to iscsi statistic struct
 715  */
 716 static void cxgb3i_conn_get_stats(struct iscsi_cls_conn *cls_conn,
 717                                   struct iscsi_stats *stats)
 718 {
 719         struct iscsi_conn *conn = cls_conn->dd_data;
 720
 721         stats->txdata_octets = conn->txdata_octets;
 722         stats->rxdata_octets = conn->rxdata_octets;
 723         stats->scsicmd_pdus = conn->scsicmd_pdus_cnt;
 724         stats->dataout_pdus = conn->dataout_pdus_cnt;
 725         stats->scsirsp_pdus = conn->scsirsp_pdus_cnt;
 726         stats->datain_pdus = conn->datain_pdus_cnt;
 727         stats->r2t_pdus = conn->r2t_pdus_cnt;
 728         stats->tmfcmd_pdus = conn->tmfcmd_pdus_cnt;
 729         stats->tmfrsp_pdus = conn->tmfrsp_pdus_cnt;
 730         stats->digest_err = 0;
 731         stats->timeout_err = 0;
 732         stats->custom_length = 1;
 733         strcpy(stats->custom[0].desc, "eh_abort_cnt");
 734         stats->custom[0].value = conn->eh_abort_cnt;
 735 }
 736
 737 /**
 738  * cxgb3i_parse_itt - get the idx and age bits from a given tag
 739  * @conn:       iscsi connection
 740  * @itt:        itt tag
 741  * @idx:        task index, filled in by this function
 742  * @age:        session age, filled in by this function
 743  */
 744 static void cxgb3i_parse_itt(struct iscsi_conn *conn, itt_t itt,
 745                              int *idx, int *age)
 746 {
 747         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
 748         struct cxgb3i_conn *cconn = tcp_conn->dd_data;
 749         struct cxgb3i_adapter *snic = cconn->hba->snic;
 750         u32 tag = ntohl((__force u32) itt);
 751         u32 sw_bits;
 752
 753         sw_bits = cxgb3i_tag_nonrsvd_bits(&snic->tag_format, tag);
 754         if (idx)
 755                 *idx = sw_bits & ((1 << cconn->task_idx_bits) - 1);
 756         if (age)
 757                 *age = (sw_bits >> cconn->task_idx_bits) & ISCSI_AGE_MASK;
 758
 759         cxgb3i_tag_debug("parse tag 0x%x/0x%x, sw 0x%x, itt 0x%x, age 0x%x.\n",
 760                          tag, itt, sw_bits, idx ? *idx : 0xFFFFF,
 761                          age ? *age : 0xFF);
 762 }
 763
 764 /**
 765  * cxgb3i_reserve_itt - generate tag for a give task
 766  * Try to set up ddp for a scsi read task.
 767  * @task: iscsi task
 768  * @hdr_itt: tag, filled in by this function
 769  */
 770 int cxgb3i_reserve_itt(struct iscsi_task *task, itt_t *hdr_itt)
 771 {
 772         struct scsi_cmnd *sc = task->sc;
 773         struct iscsi_conn *conn = task->conn;
 774         struct iscsi_session *sess = conn->session;
 775         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
 776         struct cxgb3i_conn *cconn = tcp_conn->dd_data;
 777         struct cxgb3i_adapter *snic = cconn->hba->snic;
 778         struct cxgb3i_tag_format *tformat = &snic->tag_format;
 779         u32 sw_tag = (sess->age << cconn->task_idx_bits) | task->itt;
 780         u32 tag;
 781         int err = -EINVAL;
 782
 783         if (sc &&
 784             (scsi_bidi_cmnd(sc) || sc->sc_data_direction == DMA_FROM_DEVICE) &&
 785             cxgb3i_sw_tag_usable(tformat, sw_tag)) {
 786                 struct s3_conn *c3cn = cconn->cep->c3cn;
 787                 struct cxgb3i_gather_list *gl;
 788
 789                 gl = cxgb3i_ddp_make_gl(scsi_in(sc)->length,
 790                                         scsi_in(sc)->table.sgl,
 791                                         scsi_in(sc)->table.nents,
 792                                         snic->pdev,
 793                                         GFP_ATOMIC);
 794                 if (gl) {
 795                         tag = sw_tag;
 796                         err = cxgb3i_ddp_tag_reserve(snic->tdev, c3cn->tid,
 797                                                      tformat, &tag,
 798                                                      gl, GFP_ATOMIC);
 799                         if (err < 0)
 800                                 cxgb3i_ddp_release_gl(gl, snic->pdev);
 801                 }
 802         }
 803
 804         if (err < 0)
 805                 tag = cxgb3i_set_non_ddp_tag(tformat, sw_tag);
 806         /* the itt need to sent in big-endian order */
 807         *hdr_itt = (__force itt_t)htonl(tag);
 808
 809         cxgb3i_tag_debug("new tag 0x%x/0x%x (itt 0x%x, age 0x%x).\n",
 810                          tag, *hdr_itt, task->itt, sess->age);
 811         return 0;
 812 }
 813
 814 /**
 815  * cxgb3i_release_itt - release the tag for a given task
 816  * if the tag is a ddp tag, release the ddp setup
 817  * @task:       iscsi task
 818  * @hdr_itt:    tag
 819  */
 820 void cxgb3i_release_itt(struct iscsi_task *task, itt_t hdr_itt)
 821 {
 822         struct scsi_cmnd *sc = task->sc;
 823         struct iscsi_tcp_conn *tcp_conn = task->conn->dd_data;
 824         struct cxgb3i_conn *cconn = tcp_conn->dd_data;
 825         struct cxgb3i_adapter *snic = cconn->hba->snic;
 826         struct cxgb3i_tag_format *tformat = &snic->tag_format;
 827         u32 tag = ntohl((__force u32)hdr_itt);
 828
 829         cxgb3i_tag_debug("release tag 0x%x.\n", tag);
 830
 831         if (sc &&
 832             (scsi_bidi_cmnd(sc) || sc->sc_data_direction == DMA_FROM_DEVICE) &&
 833             cxgb3i_is_ddp_tag(tformat, tag))
 834                 cxgb3i_ddp_tag_release(snic->tdev, tag);
 835 }
 836
 837 /**
 838  * cxgb3i_host_template -- Scsi_Host_Template structure
 839  *      used when registering with the scsi mid layer
 840  */
 841 static struct scsi_host_template cxgb3i_host_template = {
 842         .module                 = THIS_MODULE,
 843         .name                   = "Chelsio S3xx iSCSI Initiator",
 844         .proc_name              = "cxgb3i",
 845         .queuecommand           = iscsi_queuecommand,
 846         .change_queue_depth     = iscsi_change_queue_depth,
 847         .can_queue              = 128 * (ISCSI_DEF_XMIT_CMDS_MAX - 1),
 848         .sg_tablesize           = SG_ALL,
 849         .max_sectors            = 0xFFFF,
 850         .cmd_per_lun            = ISCSI_DEF_CMD_PER_LUN,
 851         .eh_abort_handler       = iscsi_eh_abort,
 852         .eh_device_reset_handler = iscsi_eh_device_reset,
 853         .eh_target_reset_handler = iscsi_eh_target_reset,
 854         .use_clustering         = DISABLE_CLUSTERING,
 855         .this_id                = -1,
 856 };
 857
 858 static struct iscsi_transport cxgb3i_iscsi_transport = {
 859         .owner                  = THIS_MODULE,
 860         .name                   = "cxgb3i",
 861         .caps                   = CAP_RECOVERY_L0 | CAP_MULTI_R2T | CAP_HDRDGST
 862                                 | CAP_DATADGST | CAP_DIGEST_OFFLOAD |
 863                                 CAP_PADDING_OFFLOAD,
 864         .param_mask             = ISCSI_MAX_RECV_DLENGTH |
 865                                 ISCSI_MAX_XMIT_DLENGTH |
 866                                 ISCSI_HDRDGST_EN |
 867                                 ISCSI_DATADGST_EN |
 868                                 ISCSI_INITIAL_R2T_EN |
 869                                 ISCSI_MAX_R2T |
 870                                 ISCSI_IMM_DATA_EN |
 871                                 ISCSI_FIRST_BURST |
 872                                 ISCSI_MAX_BURST |
 873                                 ISCSI_PDU_INORDER_EN |
 874                                 ISCSI_DATASEQ_INORDER_EN |
 875                                 ISCSI_ERL |
 876                                 ISCSI_CONN_PORT |
 877                                 ISCSI_CONN_ADDRESS |
 878                                 ISCSI_EXP_STATSN |
 879                                 ISCSI_PERSISTENT_PORT |
 880                                 ISCSI_PERSISTENT_ADDRESS |
 881                                 ISCSI_TARGET_NAME | ISCSI_TPGT |
 882                                 ISCSI_USERNAME | ISCSI_PASSWORD |
 883                                 ISCSI_USERNAME_IN | ISCSI_PASSWORD_IN |
 884                                 ISCSI_FAST_ABORT | ISCSI_ABORT_TMO |
 885                                 ISCSI_LU_RESET_TMO |
 886                                 ISCSI_PING_TMO | ISCSI_RECV_TMO |
 887                                 ISCSI_IFACE_NAME | ISCSI_INITIATOR_NAME,
 888         .host_param_mask        = ISCSI_HOST_HWADDRESS | ISCSI_HOST_IPADDRESS |
 889                         ISCSI_HOST_INITIATOR_NAME | ISCSI_HOST_NETDEV_NAME,
 890         .get_host_param         = cxgb3i_host_get_param,
 891         .set_host_param         = cxgb3i_host_set_param,
 892         /* session management */
 893         .create_session         = cxgb3i_session_create,
 894         .destroy_session        = cxgb3i_session_destroy,
 895         .get_session_param      = iscsi_session_get_param,
 896         /* connection management */
 897         .create_conn            = cxgb3i_conn_create,
 898         .bind_conn              = cxgb3i_conn_bind,
 899         .destroy_conn           = iscsi_tcp_conn_teardown,
 900         .start_conn             = iscsi_conn_start,
 901         .stop_conn              = iscsi_conn_stop,
 902         .get_conn_param         = cxgb3i_conn_get_param,
 903         .set_param              = cxgb3i_conn_set_param,
 904         .get_stats              = cxgb3i_conn_get_stats,
 905         /* pdu xmit req. from user space */
 906         .send_pdu               = iscsi_conn_send_pdu,
 907         /* task */
 908         .init_task              = iscsi_tcp_task_init,
 909         .xmit_task              = iscsi_tcp_task_xmit,
 910         .cleanup_task           = cxgb3i_conn_cleanup_task,
 911
 912         /* pdu */
 913         .alloc_pdu              = cxgb3i_conn_alloc_pdu,
 914         .init_pdu               = cxgb3i_conn_init_pdu,
 915         .xmit_pdu               = cxgb3i_conn_xmit_pdu,
 916         .parse_pdu_itt          = cxgb3i_parse_itt,
 917
 918         /* TCP connect/disconnect */
 919         .ep_connect             = cxgb3i_ep_connect,
 920         .ep_poll                = cxgb3i_ep_poll,
 921         .ep_disconnect          = cxgb3i_ep_disconnect,
 922         /* Error recovery timeout call */
 923         .session_recovery_timedout = iscsi_session_recovery_timedout,
 924 };
 925
 926 int cxgb3i_iscsi_init(void)
 927 {
 928         sw_tag_idx_bits = (__ilog2_u32(ISCSI_ITT_MASK)) + 1;
 929         sw_tag_age_bits = (__ilog2_u32(ISCSI_AGE_MASK)) + 1;
 930         cxgb3i_log_info("tag itt 0x%x, %u bits, age 0x%x, %u bits.\n",
 931                         ISCSI_ITT_MASK, sw_tag_idx_bits,
 932                         ISCSI_AGE_MASK, sw_tag_age_bits);
 933
 934         cxgb3i_scsi_transport =
 935             iscsi_register_transport(&cxgb3i_iscsi_transport);
 936         if (!cxgb3i_scsi_transport) {
 937                 cxgb3i_log_error("Could not register cxgb3i transport.\n");
 938                 return -ENODEV;
 939         }
 940         cxgb3i_api_debug("cxgb3i transport 0x%p.\n", cxgb3i_scsi_transport);
 941         return 0;
 942 }
 943
 944 void cxgb3i_iscsi_cleanup(void)
 945 {
 946         if (cxgb3i_scsi_transport) {
 947                 cxgb3i_api_debug("cxgb3i transport 0x%p.\n",
 948                                  cxgb3i_scsi_transport);
 949                 iscsi_unregister_transport(&cxgb3i_iscsi_transport);
 950         }
 951 }