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   1 /* cxgb3i_iscsi.c: Chelsio S3xx iSCSI driver.
   2  *
   3  * Copyright (c) 2008 Chelsio Communications, Inc.
   4  * Copyright (c) 2008 Mike Christie
   5  * Copyright (c) 2008 Red Hat, Inc.  All rights reserved.
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation.
  10  *
  11  * Written by: Karen Xie (kxie@chelsio.com)
  12  */
  13
  14 #include <linux/inet.h>
  15 #include <linux/crypto.h>
  16 #include <net/tcp.h>
  17 #include <scsi/scsi_cmnd.h>
  18 #include <scsi/scsi_device.h>
  19 #include <scsi/scsi_eh.h>
  20 #include <scsi/scsi_host.h>
  21 #include <scsi/scsi.h>
  22 #include <scsi/iscsi_proto.h>
  23 #include <scsi/libiscsi.h>
  24 #include <scsi/scsi_transport_iscsi.h>
  25
  26 #include "cxgb3i.h"
  27 #include "cxgb3i_pdu.h"
  28
  29 #ifdef __DEBUG_CXGB3I_TAG__
  30 #define cxgb3i_tag_debug        cxgb3i_log_debug
  31 #else
  32 #define cxgb3i_tag_debug(fmt...)
  33 #endif
  34
  35 #ifdef __DEBUG_CXGB3I_API__
  36 #define cxgb3i_api_debug        cxgb3i_log_debug
  37 #else
  38 #define cxgb3i_api_debug(fmt...)
  39 #endif
  40
  41 /*
  42  * align pdu size to multiple of 512 for better performance
  43  */
  44 #define align_pdu_size(n) do { n = (n) & (~511); } while (0)
  45
  46 static struct scsi_transport_template *cxgb3i_scsi_transport;
  47 static struct scsi_host_template cxgb3i_host_template;
  48 static struct iscsi_transport cxgb3i_iscsi_transport;
  49 static unsigned char sw_tag_idx_bits;
  50 static unsigned char sw_tag_age_bits;
  51
  52 static LIST_HEAD(cxgb3i_snic_list);
  53 static DEFINE_RWLOCK(cxgb3i_snic_rwlock);
  54
  55 /**
  56  * cxgb3i_adapter_add - init a s3 adapter structure and any h/w settings
  57  * @t3dev: t3cdev adapter
  58  * return the resulting cxgb3i_adapter struct
  59  */
  60 struct cxgb3i_adapter *cxgb3i_adapter_add(struct t3cdev *t3dev)
  61 {
  62         struct cxgb3i_adapter *snic;
  63         struct adapter *adapter = tdev2adap(t3dev);
  64         int i;
  65
  66         snic = kzalloc(sizeof(*snic), GFP_KERNEL);
  67         if (!snic) {
  68                 cxgb3i_api_debug("cxgb3 %s, OOM.\n", t3dev->name);
  69                 return NULL;
  70         }
  71         spin_lock_init(&snic->lock);
  72
  73         snic->tdev = t3dev;
  74         snic->pdev = adapter->pdev;
  75         snic->tag_format.sw_bits = sw_tag_idx_bits + sw_tag_age_bits;
  76
  77         if (cxgb3i_adapter_ddp_init(t3dev, &snic->tag_format,
  78                                     &snic->tx_max_size,
  79                                     &snic->rx_max_size) < 0)
  80                 goto free_snic;
  81
  82         for_each_port(adapter, i) {
  83                 snic->hba[i] = cxgb3i_hba_host_add(snic, adapter->port[i]);
  84                 if (!snic->hba[i])
  85                         goto ulp_cleanup;
  86         }
  87         snic->hba_cnt = adapter->params.nports;
  88
  89         /* add to the list */
  90         write_lock(&cxgb3i_snic_rwlock);
  91         list_add_tail(&snic->list_head, &cxgb3i_snic_list);
  92         write_unlock(&cxgb3i_snic_rwlock);
  93
  94         return snic;
  95
  96 ulp_cleanup:
  97         cxgb3i_adapter_ddp_cleanup(t3dev);
  98 free_snic:
  99         kfree(snic);
 100         return NULL;
 101 }
 102
 103 /**
 104  * cxgb3i_adapter_remove - release all the resources held and cleanup any
 105  *      h/w settings
 106  * @t3dev: t3cdev adapter
 107  */
 108 void cxgb3i_adapter_remove(struct t3cdev *t3dev)
 109 {
 110         int i;
 111         struct cxgb3i_adapter *snic;
 112
 113         /* remove from the list */
 114         write_lock(&cxgb3i_snic_rwlock);
 115         list_for_each_entry(snic, &cxgb3i_snic_list, list_head) {
 116                 if (snic->tdev == t3dev) {
 117                         list_del(&snic->list_head);
 118                         break;
 119                 }
 120         }
 121         write_unlock(&cxgb3i_snic_rwlock);
 122
 123         if (snic) {
 124                 for (i = 0; i < snic->hba_cnt; i++) {
 125                         if (snic->hba[i]) {
 126                                 cxgb3i_hba_host_remove(snic->hba[i]);
 127                                 snic->hba[i] = NULL;
 128                         }
 129                 }
 130
 131                 /* release ddp resources */
 132                 cxgb3i_adapter_ddp_cleanup(snic->tdev);
 133                 kfree(snic);
 134         }
 135 }
 136
 137 /**
 138  * cxgb3i_hba_find_by_netdev - find the cxgb3i_hba structure with a given
 139  *      net_device
 140  * @t3dev: t3cdev adapter
 141  */
 142 struct cxgb3i_hba *cxgb3i_hba_find_by_netdev(struct net_device *ndev)
 143 {
 144         struct cxgb3i_adapter *snic;
 145         int i;
 146
 147         read_lock(&cxgb3i_snic_rwlock);
 148         list_for_each_entry(snic, &cxgb3i_snic_list, list_head) {
 149                 for (i = 0; i < snic->hba_cnt; i++) {
 150                         if (snic->hba[i]->ndev == ndev) {
 151                                 read_unlock(&cxgb3i_snic_rwlock);
 152                                 return snic->hba[i];
 153                         }
 154                 }
 155         }
 156         read_unlock(&cxgb3i_snic_rwlock);
 157         return NULL;
 158 }
 159
 160 /**
 161  * cxgb3i_hba_host_add - register a new host with scsi/iscsi
 162  * @snic: the cxgb3i adapter
 163  * @ndev: associated net_device
 164  */
 165 struct cxgb3i_hba *cxgb3i_hba_host_add(struct cxgb3i_adapter *snic,
 166                                        struct net_device *ndev)
 167 {
 168         struct cxgb3i_hba *hba;
 169         struct Scsi_Host *shost;
 170         int err;
 171
 172         shost = iscsi_host_alloc(&cxgb3i_host_template,
 173                                  sizeof(struct cxgb3i_hba), 1);
 174         if (!shost) {
 175                 cxgb3i_log_info("iscsi_host_alloc failed.\n");
 176                 return NULL;
 177         }
 178
 179         shost->transportt = cxgb3i_scsi_transport;
 180         shost->max_lun = CXGB3I_MAX_LUN;
 181         shost->max_id = CXGB3I_MAX_TARGET;
 182         shost->max_channel = 0;
 183         shost->max_cmd_len = 16;
 184
 185         hba = iscsi_host_priv(shost);
 186         hba->snic = snic;
 187         hba->ndev = ndev;
 188         hba->shost = shost;
 189
 190         pci_dev_get(snic->pdev);
 191         err = iscsi_host_add(shost, &snic->pdev->dev);
 192         if (err) {
 193                 cxgb3i_log_info("iscsi_host_add failed.\n");
 194                 goto pci_dev_put;
 195         }
 196
 197         cxgb3i_api_debug("shost 0x%p, hba 0x%p, no %u.\n",
 198                          shost, hba, shost->host_no);
 199
 200         return hba;
 201
 202 pci_dev_put:
 203         pci_dev_put(snic->pdev);
 204         scsi_host_put(shost);
 205         return NULL;
 206 }
 207
 208 /**
 209  * cxgb3i_hba_host_remove - de-register the host with scsi/iscsi
 210  * @hba: the cxgb3i hba
 211  */
 212 void cxgb3i_hba_host_remove(struct cxgb3i_hba *hba)
 213 {
 214         cxgb3i_api_debug("shost 0x%p, hba 0x%p, no %u.\n",
 215                          hba->shost, hba, hba->shost->host_no);
 216         iscsi_host_remove(hba->shost);
 217         pci_dev_put(hba->snic->pdev);
 218         iscsi_host_free(hba->shost);
 219 }
 220
 221 /**
 222  * cxgb3i_ep_connect - establish TCP connection to target portal
 223  * @dst_addr:           target IP address
 224  * @non_blocking:       blocking or non-blocking call
 225  *
 226  * Initiates a TCP/IP connection to the dst_addr
 227  */
 228 static struct iscsi_endpoint *cxgb3i_ep_connect(struct sockaddr *dst_addr,
 229                                                 int non_blocking)
 230 {
 231         struct iscsi_endpoint *ep;
 232         struct cxgb3i_endpoint *cep;
 233         struct cxgb3i_hba *hba;
 234         struct s3_conn *c3cn = NULL;
 235         int err = 0;
 236
 237         c3cn = cxgb3i_c3cn_create();
 238         if (!c3cn) {
 239                 cxgb3i_log_info("ep connect OOM.\n");
 240                 err = -ENOMEM;
 241                 goto release_conn;
 242         }
 243
 244         err = cxgb3i_c3cn_connect(c3cn, (struct sockaddr_in *)dst_addr);
 245         if (err < 0) {
 246                 cxgb3i_log_info("ep connect failed.\n");
 247                 goto release_conn;
 248         }
 249         hba = cxgb3i_hba_find_by_netdev(c3cn->dst_cache->dev);
 250         if (!hba) {
 251                 err = -ENOSPC;
 252                 cxgb3i_log_info("NOT going through cxgbi device.\n");
 253                 goto release_conn;
 254         }
 255         if (c3cn_is_closing(c3cn)) {
 256                 err = -ENOSPC;
 257                 cxgb3i_log_info("ep connect unable to connect.\n");
 258                 goto release_conn;
 259         }
 260
 261         ep = iscsi_create_endpoint(sizeof(*cep));
 262         if (!ep) {
 263                 err = -ENOMEM;
 264                 cxgb3i_log_info("iscsi alloc ep, OOM.\n");
 265                 goto release_conn;
 266         }
 267         cep = ep->dd_data;
 268         cep->c3cn = c3cn;
 269         cep->hba = hba;
 270
 271         cxgb3i_api_debug("ep 0x%p, 0x%p, c3cn 0x%p, hba 0x%p.\n",
 272                           ep, cep, c3cn, hba);
 273         return ep;
 274
 275 release_conn:
 276         cxgb3i_api_debug("conn 0x%p failed, release.\n", c3cn);
 277         if (c3cn)
 278                 cxgb3i_c3cn_release(c3cn);
 279         return ERR_PTR(err);
 280 }
 281
 282 /**
 283  * cxgb3i_ep_poll - polls for TCP connection establishement
 284  * @ep:         TCP connection (endpoint) handle
 285  * @timeout_ms: timeout value in milli secs
 286  *
 287  * polls for TCP connect request to complete
 288  */
 289 static int cxgb3i_ep_poll(struct iscsi_endpoint *ep, int timeout_ms)
 290 {
 291         struct cxgb3i_endpoint *cep = ep->dd_data;
 292         struct s3_conn *c3cn = cep->c3cn;
 293
 294         if (!c3cn_is_established(c3cn))
 295                 return 0;
 296         cxgb3i_api_debug("ep 0x%p, c3cn 0x%p established.\n", ep, c3cn);
 297         return 1;
 298 }
 299
 300 /**
 301  * cxgb3i_ep_disconnect - teardown TCP connection
 302  * @ep:         TCP connection (endpoint) handle
 303  *
 304  * teardown TCP connection
 305  */
 306 static void cxgb3i_ep_disconnect(struct iscsi_endpoint *ep)
 307 {
 308         struct cxgb3i_endpoint *cep = ep->dd_data;
 309         struct cxgb3i_conn *cconn = cep->cconn;
 310
 311         cxgb3i_api_debug("ep 0x%p, cep 0x%p.\n", ep, cep);
 312
 313         if (cconn && cconn->conn) {
 314                 /*
 315                  * stop the xmit path so the xmit_pdu function is
 316                  * not being called
 317                  */
 318                 iscsi_suspend_tx(cconn->conn);
 319
 320                 write_lock_bh(&cep->c3cn->callback_lock);
 321                 cep->c3cn->user_data = NULL;
 322                 cconn->cep = NULL;
 323                 write_unlock_bh(&cep->c3cn->callback_lock);
 324         }
 325
 326         cxgb3i_api_debug("ep 0x%p, cep 0x%p, release c3cn 0x%p.\n",
 327                          ep, cep, cep->c3cn);
 328         cxgb3i_c3cn_release(cep->c3cn);
 329         iscsi_destroy_endpoint(ep);
 330 }
 331
 332 /**
 333  * cxgb3i_session_create - create a new iscsi session
 334  * @cmds_max:           max # of commands
 335  * @qdepth:             scsi queue depth
 336  * @initial_cmdsn:      initial iscsi CMDSN for this session
 337  * @host_no:            pointer to return host no
 338  *
 339  * Creates a new iSCSI session
 340  */
 341 static struct iscsi_cls_session *
 342 cxgb3i_session_create(struct iscsi_endpoint *ep, u16 cmds_max, u16 qdepth,
 343                       u32 initial_cmdsn, u32 *host_no)
 344 {
 345         struct cxgb3i_endpoint *cep;
 346         struct cxgb3i_hba *hba;
 347         struct Scsi_Host *shost;
 348         struct iscsi_cls_session *cls_session;
 349         struct iscsi_session *session;
 350
 351         if (!ep) {
 352                 cxgb3i_log_error("%s, missing endpoint.\n", __func__);
 353                 return NULL;
 354         }
 355
 356         cep = ep->dd_data;
 357         hba = cep->hba;
 358         shost = hba->shost;
 359         cxgb3i_api_debug("ep 0x%p, cep 0x%p, hba 0x%p.\n", ep, cep, hba);
 360         BUG_ON(hba != iscsi_host_priv(shost));
 361
 362         *host_no = shost->host_no;
 363
 364         cls_session = iscsi_session_setup(&cxgb3i_iscsi_transport, shost,
 365                                           cmds_max,
 366                                           sizeof(struct iscsi_tcp_task) +
 367                                           sizeof(struct cxgb3i_task_data),
 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 = max(512 * MAX_SKB_FRAGS, SKB_TX_HEADROOM);
 406
 407         max = min(cconn->hba->snic->tx_max_size, max);
 408         if (conn->max_xmit_dlength)
 409                 conn->max_xmit_dlength = min(conn->max_xmit_dlength, max);
 410         else
 411                 conn->max_xmit_dlength = max;
 412         align_pdu_size(conn->max_xmit_dlength);
 413         cxgb3i_api_debug("conn 0x%p, max xmit %u.\n",
 414                          conn, conn->max_xmit_dlength);
 415         return 0;
 416 }
 417
 418 /**
 419  * cxgb3i_conn_max_recv_dlength -- check the max. recv pdu segment size against
 420  * the hardware limit
 421  * @conn: iscsi connection
 422  * return 0 if the value is valid, < 0 otherwise.
 423  */
 424 static inline int cxgb3i_conn_max_recv_dlength(struct iscsi_conn *conn)
 425 {
 426         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
 427         struct cxgb3i_conn *cconn = tcp_conn->dd_data;
 428         unsigned int max = cconn->hba->snic->rx_max_size;
 429
 430         align_pdu_size(max);
 431         if (conn->max_recv_dlength) {
 432                 if (conn->max_recv_dlength > max) {
 433                         cxgb3i_log_error("MaxRecvDataSegmentLength %u too big."
 434                                          " Need to be <= %u.\n",
 435                                          conn->max_recv_dlength, max);
 436                         return -EINVAL;
 437                 }
 438                 conn->max_recv_dlength = min(conn->max_recv_dlength, max);
 439                 align_pdu_size(conn->max_recv_dlength);
 440         } else
 441                 conn->max_recv_dlength = max;
 442         cxgb3i_api_debug("conn 0x%p, max recv %u.\n",
 443                          conn, conn->max_recv_dlength);
 444         return 0;
 445 }
 446
 447 /**
 448  * cxgb3i_conn_create - create iscsi connection instance
 449  * @cls_session:        pointer to iscsi cls session
 450  * @cid:                iscsi cid
 451  *
 452  * Creates a new iSCSI connection instance for a given session
 453  */
 454 static struct iscsi_cls_conn *cxgb3i_conn_create(struct iscsi_cls_session
 455                                                  *cls_session, u32 cid)
 456 {
 457         struct iscsi_cls_conn *cls_conn;
 458         struct iscsi_conn *conn;
 459         struct iscsi_tcp_conn *tcp_conn;
 460         struct cxgb3i_conn *cconn;
 461
 462         cxgb3i_api_debug("sess 0x%p, cid %u.\n", cls_session, cid);
 463
 464         cls_conn = iscsi_tcp_conn_setup(cls_session, sizeof(*cconn), cid);
 465         if (!cls_conn)
 466                 return NULL;
 467         conn = cls_conn->dd_data;
 468         tcp_conn = conn->dd_data;
 469         cconn = tcp_conn->dd_data;
 470
 471         cconn->conn = conn;
 472         return cls_conn;
 473 }
 474
 475 /**
 476  * cxgb3i_conn_bind - binds iscsi sess, conn and endpoint together
 477  * @cls_session:        pointer to iscsi cls session
 478  * @cls_conn:           pointer to iscsi cls conn
 479  * @transport_eph:      64-bit EP handle
 480  * @is_leading:         leading connection on this session?
 481  *
 482  * Binds together an iSCSI session, an iSCSI connection and a
 483  *      TCP connection. This routine returns error code if the TCP
 484  *      connection does not belong on the device iSCSI sess/conn is bound
 485  */
 486
 487 static int cxgb3i_conn_bind(struct iscsi_cls_session *cls_session,
 488                             struct iscsi_cls_conn *cls_conn,
 489                             u64 transport_eph, int is_leading)
 490 {
 491         struct iscsi_conn *conn = cls_conn->dd_data;
 492         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
 493         struct cxgb3i_conn *cconn = tcp_conn->dd_data;
 494         struct cxgb3i_adapter *snic;
 495         struct iscsi_endpoint *ep;
 496         struct cxgb3i_endpoint *cep;
 497         struct s3_conn *c3cn;
 498         int err;
 499
 500         ep = iscsi_lookup_endpoint(transport_eph);
 501         if (!ep)
 502                 return -EINVAL;
 503
 504         /* setup ddp pagesize */
 505         cep = ep->dd_data;
 506         c3cn = cep->c3cn;
 507         snic = cep->hba->snic;
 508         err = cxgb3i_setup_conn_host_pagesize(snic->tdev, c3cn->tid, 0);
 509         if (err < 0)
 510                 return err;
 511
 512         cxgb3i_api_debug("ep 0x%p, cls sess 0x%p, cls conn 0x%p.\n",
 513                          ep, cls_session, cls_conn);
 514
 515         err = iscsi_conn_bind(cls_session, cls_conn, is_leading);
 516         if (err)
 517                 return -EINVAL;
 518
 519         /* calculate the tag idx bits needed for this conn based on cmds_max */
 520         cconn->task_idx_bits = (__ilog2_u32(conn->session->cmds_max - 1)) + 1;
 521         cxgb3i_api_debug("session cmds_max 0x%x, bits %u.\n",
 522                          conn->session->cmds_max, cconn->task_idx_bits);
 523
 524         read_lock(&c3cn->callback_lock);
 525         c3cn->user_data = conn;
 526         cconn->hba = cep->hba;
 527         cconn->cep = cep;
 528         cep->cconn = cconn;
 529         read_unlock(&c3cn->callback_lock);
 530
 531         cxgb3i_conn_max_xmit_dlength(conn);
 532         cxgb3i_conn_max_recv_dlength(conn);
 533
 534         spin_lock_bh(&conn->session->lock);
 535         sprintf(conn->portal_address, NIPQUAD_FMT,
 536                 NIPQUAD(c3cn->daddr.sin_addr.s_addr));
 537         conn->portal_port = ntohs(c3cn->daddr.sin_port);
 538         spin_unlock_bh(&conn->session->lock);
 539
 540         /* init recv engine */
 541         iscsi_tcp_hdr_recv_prep(tcp_conn);
 542
 543         return 0;
 544 }
 545
 546 /**
 547  * cxgb3i_conn_get_param - return iscsi connection parameter to caller
 548  * @cls_conn:   pointer to iscsi cls conn
 549  * @param:      parameter type identifier
 550  * @buf:        buffer pointer
 551  *
 552  * returns iSCSI connection parameters
 553  */
 554 static int cxgb3i_conn_get_param(struct iscsi_cls_conn *cls_conn,
 555                                  enum iscsi_param param, char *buf)
 556 {
 557         struct iscsi_conn *conn = cls_conn->dd_data;
 558         int len;
 559
 560         cxgb3i_api_debug("cls_conn 0x%p, param %d.\n", cls_conn, param);
 561
 562         switch (param) {
 563         case ISCSI_PARAM_CONN_PORT:
 564                 spin_lock_bh(&conn->session->lock);
 565                 len = sprintf(buf, "%hu\n", conn->portal_port);
 566                 spin_unlock_bh(&conn->session->lock);
 567                 break;
 568         case ISCSI_PARAM_CONN_ADDRESS:
 569                 spin_lock_bh(&conn->session->lock);
 570                 len = sprintf(buf, "%s\n", conn->portal_address);
 571                 spin_unlock_bh(&conn->session->lock);
 572                 break;
 573         default:
 574                 return iscsi_conn_get_param(cls_conn, param, buf);
 575         }
 576
 577         return len;
 578 }
 579
 580 /**
 581  * cxgb3i_conn_set_param - set iscsi connection parameter
 582  * @cls_conn:   pointer to iscsi cls conn
 583  * @param:      parameter type identifier
 584  * @buf:        buffer pointer
 585  * @buflen:     buffer length
 586  *
 587  * set iSCSI connection parameters
 588  */
 589 static int cxgb3i_conn_set_param(struct iscsi_cls_conn *cls_conn,
 590                                  enum iscsi_param param, char *buf, int buflen)
 591 {
 592         struct iscsi_conn *conn = cls_conn->dd_data;
 593         struct iscsi_session *session = conn->session;
 594         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
 595         struct cxgb3i_conn *cconn = tcp_conn->dd_data;
 596         struct cxgb3i_adapter *snic = cconn->hba->snic;
 597         struct s3_conn *c3cn = cconn->cep->c3cn;
 598         int value, err = 0;
 599
 600         switch (param) {
 601         case ISCSI_PARAM_HDRDGST_EN:
 602                 err = iscsi_set_param(cls_conn, param, buf, buflen);
 603                 if (!err && conn->hdrdgst_en)
 604                         err = cxgb3i_setup_conn_digest(snic->tdev, c3cn->tid,
 605                                                         conn->hdrdgst_en,
 606                                                         conn->datadgst_en, 0);
 607                 break;
 608         case ISCSI_PARAM_DATADGST_EN:
 609                 err = iscsi_set_param(cls_conn, param, buf, buflen);
 610                 if (!err && conn->datadgst_en)
 611                         err = cxgb3i_setup_conn_digest(snic->tdev, c3cn->tid,
 612                                                         conn->hdrdgst_en,
 613                                                         conn->datadgst_en, 0);
 614                 break;
 615         case ISCSI_PARAM_MAX_R2T:
 616                 sscanf(buf, "%d", &value);
 617                 if (value <= 0 || !is_power_of_2(value))
 618                         return -EINVAL;
 619                 if (session->max_r2t == value)
 620                         break;
 621                 iscsi_tcp_r2tpool_free(session);
 622                 err = iscsi_set_param(cls_conn, param, buf, buflen);
 623                 if (!err && iscsi_tcp_r2tpool_alloc(session))
 624                         return -ENOMEM;
 625         case ISCSI_PARAM_MAX_RECV_DLENGTH:
 626                 err = iscsi_set_param(cls_conn, param, buf, buflen);
 627                 if (!err)
 628                         err = cxgb3i_conn_max_recv_dlength(conn);
 629                 break;
 630         case ISCSI_PARAM_MAX_XMIT_DLENGTH:
 631                 err = iscsi_set_param(cls_conn, param, buf, buflen);
 632                 if (!err)
 633                         err = cxgb3i_conn_max_xmit_dlength(conn);
 634                 break;
 635         default:
 636                 return iscsi_set_param(cls_conn, param, buf, buflen);
 637         }
 638         return err;
 639 }
 640
 641 /**
 642  * cxgb3i_host_set_param - configure host (adapter) related parameters
 643  * @shost:      scsi host pointer
 644  * @param:      parameter type identifier
 645  * @buf:        buffer pointer
 646  */
 647 static int cxgb3i_host_set_param(struct Scsi_Host *shost,
 648                                  enum iscsi_host_param param,
 649                                  char *buf, int buflen)
 650 {
 651         struct cxgb3i_hba *hba = iscsi_host_priv(shost);
 652
 653         cxgb3i_api_debug("param %d, buf %s.\n", param, buf);
 654
 655         switch (param) {
 656         case ISCSI_HOST_PARAM_IPADDRESS:
 657         {
 658                 __be32 addr = in_aton(buf);
 659                 cxgb3i_set_private_ipv4addr(hba->ndev, addr);
 660                 return 0;
 661         }
 662         case ISCSI_HOST_PARAM_HWADDRESS:
 663         case ISCSI_HOST_PARAM_NETDEV_NAME:
 664                 /* ignore */
 665                 return 0;
 666         default:
 667                 return iscsi_host_set_param(shost, param, buf, buflen);
 668         }
 669 }
 670
 671 /**
 672  * cxgb3i_host_get_param - returns host (adapter) related parameters
 673  * @shost:      scsi host pointer
 674  * @param:      parameter type identifier
 675  * @buf:        buffer pointer
 676  */
 677 static int cxgb3i_host_get_param(struct Scsi_Host *shost,
 678                                  enum iscsi_host_param param, char *buf)
 679 {
 680         struct cxgb3i_hba *hba = iscsi_host_priv(shost);
 681         int len = 0;
 682
 683         cxgb3i_api_debug("hba %s, param %d.\n", hba->ndev->name, param);
 684
 685         switch (param) {
 686         case ISCSI_HOST_PARAM_HWADDRESS:
 687                 len = sysfs_format_mac(buf, hba->ndev->dev_addr, 6);
 688                 break;
 689         case ISCSI_HOST_PARAM_NETDEV_NAME:
 690                 len = sprintf(buf, "%s\n", hba->ndev->name);
 691                 break;
 692         case ISCSI_HOST_PARAM_IPADDRESS:
 693         {
 694                 __be32 addr;
 695
 696                 addr = cxgb3i_get_private_ipv4addr(hba->ndev);
 697                 len = sprintf(buf, NIPQUAD_FMT, NIPQUAD(addr));
 698                 break;
 699         }
 700         default:
 701                 return iscsi_host_get_param(shost, param, buf);
 702         }
 703         return len;
 704 }
 705
 706 /**
 707  * cxgb3i_conn_get_stats - returns iSCSI stats
 708  * @cls_conn:   pointer to iscsi cls conn
 709  * @stats:      pointer to iscsi statistic struct
 710  */
 711 static void cxgb3i_conn_get_stats(struct iscsi_cls_conn *cls_conn,
 712                                   struct iscsi_stats *stats)
 713 {
 714         struct iscsi_conn *conn = cls_conn->dd_data;
 715
 716         stats->txdata_octets = conn->txdata_octets;
 717         stats->rxdata_octets = conn->rxdata_octets;
 718         stats->scsicmd_pdus = conn->scsicmd_pdus_cnt;
 719         stats->dataout_pdus = conn->dataout_pdus_cnt;
 720         stats->scsirsp_pdus = conn->scsirsp_pdus_cnt;
 721         stats->datain_pdus = conn->datain_pdus_cnt;
 722         stats->r2t_pdus = conn->r2t_pdus_cnt;
 723         stats->tmfcmd_pdus = conn->tmfcmd_pdus_cnt;
 724         stats->tmfrsp_pdus = conn->tmfrsp_pdus_cnt;
 725         stats->digest_err = 0;
 726         stats->timeout_err = 0;
 727         stats->custom_length = 1;
 728         strcpy(stats->custom[0].desc, "eh_abort_cnt");
 729         stats->custom[0].value = conn->eh_abort_cnt;
 730 }
 731
 732 /**
 733  * cxgb3i_parse_itt - get the idx and age bits from a given tag
 734  * @conn:       iscsi connection
 735  * @itt:        itt tag
 736  * @idx:        task index, filled in by this function
 737  * @age:        session age, filled in by this function
 738  */
 739 static void cxgb3i_parse_itt(struct iscsi_conn *conn, itt_t itt,
 740                              int *idx, int *age)
 741 {
 742         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
 743         struct cxgb3i_conn *cconn = tcp_conn->dd_data;
 744         struct cxgb3i_adapter *snic = cconn->hba->snic;
 745         u32 tag = ntohl((__force u32) itt);
 746         u32 sw_bits;
 747
 748         sw_bits = cxgb3i_tag_nonrsvd_bits(&snic->tag_format, tag);
 749         if (idx)
 750                 *idx = sw_bits & ((1 << cconn->task_idx_bits) - 1);
 751         if (age)
 752                 *age = (sw_bits >> cconn->task_idx_bits) & ISCSI_AGE_MASK;
 753
 754         cxgb3i_tag_debug("parse tag 0x%x/0x%x, sw 0x%x, itt 0x%x, age 0x%x.\n",
 755                          tag, itt, sw_bits, idx ? *idx : 0xFFFFF,
 756                          age ? *age : 0xFF);
 757 }
 758
 759 /**
 760  * cxgb3i_reserve_itt - generate tag for a give task
 761  * Try to set up ddp for a scsi read task.
 762  * @task: iscsi task
 763  * @hdr_itt: tag, filled in by this function
 764  */
 765 int cxgb3i_reserve_itt(struct iscsi_task *task, itt_t *hdr_itt)
 766 {
 767         struct scsi_cmnd *sc = task->sc;
 768         struct iscsi_conn *conn = task->conn;
 769         struct iscsi_session *sess = conn->session;
 770         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
 771         struct cxgb3i_conn *cconn = tcp_conn->dd_data;
 772         struct cxgb3i_adapter *snic = cconn->hba->snic;
 773         struct cxgb3i_tag_format *tformat = &snic->tag_format;
 774         u32 sw_tag = (sess->age << cconn->task_idx_bits) | task->itt;
 775         u32 tag;
 776         int err = -EINVAL;
 777
 778         if (sc &&
 779             (scsi_bidi_cmnd(sc) || sc->sc_data_direction == DMA_FROM_DEVICE) &&
 780             cxgb3i_sw_tag_usable(tformat, sw_tag)) {
 781                 struct s3_conn *c3cn = cconn->cep->c3cn;
 782                 struct cxgb3i_gather_list *gl;
 783
 784                 gl = cxgb3i_ddp_make_gl(scsi_in(sc)->length,
 785                                         scsi_in(sc)->table.sgl,
 786                                         scsi_in(sc)->table.nents,
 787                                         snic->pdev,
 788                                         GFP_ATOMIC);
 789                 if (gl) {
 790                         tag = sw_tag;
 791                         err = cxgb3i_ddp_tag_reserve(snic->tdev, c3cn->tid,
 792                                                      tformat, &tag,
 793                                                      gl, GFP_ATOMIC);
 794                         if (err < 0)
 795                                 cxgb3i_ddp_release_gl(gl, snic->pdev);
 796                 }
 797         }
 798
 799         if (err < 0)
 800                 tag = cxgb3i_set_non_ddp_tag(tformat, sw_tag);
 801         /* the itt need to sent in big-endian order */
 802         *hdr_itt = (__force itt_t)htonl(tag);
 803
 804         cxgb3i_tag_debug("new tag 0x%x/0x%x (itt 0x%x, age 0x%x).\n",
 805                          tag, *hdr_itt, task->itt, sess->age);
 806         return 0;
 807 }
 808
 809 /**
 810  * cxgb3i_release_itt - release the tag for a given task
 811  * if the tag is a ddp tag, release the ddp setup
 812  * @task:       iscsi task
 813  * @hdr_itt:    tag
 814  */
 815 void cxgb3i_release_itt(struct iscsi_task *task, itt_t hdr_itt)
 816 {
 817         struct scsi_cmnd *sc = task->sc;
 818         struct iscsi_tcp_conn *tcp_conn = task->conn->dd_data;
 819         struct cxgb3i_conn *cconn = tcp_conn->dd_data;
 820         struct cxgb3i_adapter *snic = cconn->hba->snic;
 821         struct cxgb3i_tag_format *tformat = &snic->tag_format;
 822         u32 tag = ntohl((__force u32)hdr_itt);
 823
 824         cxgb3i_tag_debug("release tag 0x%x.\n", tag);
 825
 826         if (sc &&
 827             (scsi_bidi_cmnd(sc) || sc->sc_data_direction == DMA_FROM_DEVICE) &&
 828             cxgb3i_is_ddp_tag(tformat, tag))
 829                 cxgb3i_ddp_tag_release(snic->tdev, tag);
 830 }
 831
 832 /**
 833  * cxgb3i_host_template -- Scsi_Host_Template structure
 834  *      used when registering with the scsi mid layer
 835  */
 836 static struct scsi_host_template cxgb3i_host_template = {
 837         .module                 = THIS_MODULE,
 838         .name                   = "Chelsio S3xx iSCSI Initiator",
 839         .proc_name              = "cxgb3i",
 840         .queuecommand           = iscsi_queuecommand,
 841         .change_queue_depth     = iscsi_change_queue_depth,
 842         .can_queue              = CXGB3I_SCSI_QDEPTH_DFLT - 1,
 843         .sg_tablesize           = SG_ALL,
 844         .max_sectors            = 0xFFFF,
 845         .cmd_per_lun            = CXGB3I_SCSI_QDEPTH_DFLT,
 846         .eh_abort_handler       = iscsi_eh_abort,
 847         .eh_device_reset_handler = iscsi_eh_device_reset,
 848         .eh_target_reset_handler = iscsi_eh_target_reset,
 849         .use_clustering         = DISABLE_CLUSTERING,
 850         .this_id                = -1,
 851 };
 852
 853 static struct iscsi_transport cxgb3i_iscsi_transport = {
 854         .owner                  = THIS_MODULE,
 855         .name                   = "cxgb3i",
 856         .caps                   = CAP_RECOVERY_L0 | CAP_MULTI_R2T | CAP_HDRDGST
 857                                 | CAP_DATADGST | CAP_DIGEST_OFFLOAD |
 858                                 CAP_PADDING_OFFLOAD,
 859         .param_mask             = ISCSI_MAX_RECV_DLENGTH |
 860                                 ISCSI_MAX_XMIT_DLENGTH |
 861                                 ISCSI_HDRDGST_EN |
 862                                 ISCSI_DATADGST_EN |
 863                                 ISCSI_INITIAL_R2T_EN |
 864                                 ISCSI_MAX_R2T |
 865                                 ISCSI_IMM_DATA_EN |
 866                                 ISCSI_FIRST_BURST |
 867                                 ISCSI_MAX_BURST |
 868                                 ISCSI_PDU_INORDER_EN |
 869                                 ISCSI_DATASEQ_INORDER_EN |
 870                                 ISCSI_ERL |
 871                                 ISCSI_CONN_PORT |
 872                                 ISCSI_CONN_ADDRESS |
 873                                 ISCSI_EXP_STATSN |
 874                                 ISCSI_PERSISTENT_PORT |
 875                                 ISCSI_PERSISTENT_ADDRESS |
 876                                 ISCSI_TARGET_NAME | ISCSI_TPGT |
 877                                 ISCSI_USERNAME | ISCSI_PASSWORD |
 878                                 ISCSI_USERNAME_IN | ISCSI_PASSWORD_IN |
 879                                 ISCSI_FAST_ABORT | ISCSI_ABORT_TMO |
 880                                 ISCSI_LU_RESET_TMO |
 881                                 ISCSI_PING_TMO | ISCSI_RECV_TMO |
 882                                 ISCSI_IFACE_NAME | ISCSI_INITIATOR_NAME,
 883         .host_param_mask        = ISCSI_HOST_HWADDRESS | ISCSI_HOST_IPADDRESS |
 884                         ISCSI_HOST_INITIATOR_NAME | ISCSI_HOST_NETDEV_NAME,
 885         .get_host_param         = cxgb3i_host_get_param,
 886         .set_host_param         = cxgb3i_host_set_param,
 887         /* session management */
 888         .create_session         = cxgb3i_session_create,
 889         .destroy_session        = cxgb3i_session_destroy,
 890         .get_session_param      = iscsi_session_get_param,
 891         /* connection management */
 892         .create_conn            = cxgb3i_conn_create,
 893         .bind_conn              = cxgb3i_conn_bind,
 894         .destroy_conn           = iscsi_tcp_conn_teardown,
 895         .start_conn             = iscsi_conn_start,
 896         .stop_conn              = iscsi_conn_stop,
 897         .get_conn_param         = cxgb3i_conn_get_param,
 898         .set_param              = cxgb3i_conn_set_param,
 899         .get_stats              = cxgb3i_conn_get_stats,
 900         /* pdu xmit req. from user space */
 901         .send_pdu               = iscsi_conn_send_pdu,
 902         /* task */
 903         .init_task              = iscsi_tcp_task_init,
 904         .xmit_task              = iscsi_tcp_task_xmit,
 905         .cleanup_task           = cxgb3i_conn_cleanup_task,
 906
 907         /* pdu */
 908         .alloc_pdu              = cxgb3i_conn_alloc_pdu,
 909         .init_pdu               = cxgb3i_conn_init_pdu,
 910         .xmit_pdu               = cxgb3i_conn_xmit_pdu,
 911         .parse_pdu_itt          = cxgb3i_parse_itt,
 912
 913         /* TCP connect/disconnect */
 914         .ep_connect             = cxgb3i_ep_connect,
 915         .ep_poll                = cxgb3i_ep_poll,
 916         .ep_disconnect          = cxgb3i_ep_disconnect,
 917         /* Error recovery timeout call */
 918         .session_recovery_timedout = iscsi_session_recovery_timedout,
 919 };
 920
 921 int cxgb3i_iscsi_init(void)
 922 {
 923         sw_tag_idx_bits = (__ilog2_u32(ISCSI_ITT_MASK)) + 1;
 924         sw_tag_age_bits = (__ilog2_u32(ISCSI_AGE_MASK)) + 1;
 925         cxgb3i_log_info("tag itt 0x%x, %u bits, age 0x%x, %u bits.\n",
 926                         ISCSI_ITT_MASK, sw_tag_idx_bits,
 927                         ISCSI_AGE_MASK, sw_tag_age_bits);
 928
 929         cxgb3i_scsi_transport =
 930             iscsi_register_transport(&cxgb3i_iscsi_transport);
 931         if (!cxgb3i_scsi_transport) {
 932                 cxgb3i_log_error("Could not register cxgb3i transport.\n");
 933                 return -ENODEV;
 934         }
 935         cxgb3i_api_debug("cxgb3i transport 0x%p.\n", cxgb3i_scsi_transport);
 936         return 0;
 937 }
 938
 939 void cxgb3i_iscsi_cleanup(void)
 940 {
 941         if (cxgb3i_scsi_transport) {
 942                 cxgb3i_api_debug("cxgb3i transport 0x%p.\n",
 943                                  cxgb3i_scsi_transport);
 944                 iscsi_unregister_transport(&cxgb3i_iscsi_transport);
 945         }
 946 }