drivers/net/cxgb3/cxgb3_offload.c

   1 /*
   2  * Copyright (c) 2006-2008 Chelsio, Inc. All rights reserved.
   3  *
   4  * This software is available to you under a choice of one of two
   5  * licenses.  You may choose to be licensed under the terms of the GNU
   6  * General Public License (GPL) Version 2, available from the file
   7  * COPYING in the main directory of this source tree, or the
   8  * OpenIB.org BSD license below:
   9  *
  10  *     Redistribution and use in source and binary forms, with or
  11  *     without modification, are permitted provided that the following
  12  *     conditions are met:
  13  *
  14  *      - Redistributions of source code must retain the above
  15  *        copyright notice, this list of conditions and the following
  16  *        disclaimer.
  17  *
  18  *      - Redistributions in binary form must reproduce the above
  19  *        copyright notice, this list of conditions and the following
  20  *        disclaimer in the documentation and/or other materials
  21  *        provided with the distribution.
  22  *
  23  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  24  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  25  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  26  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  27  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  28  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  29  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  30  * SOFTWARE.
  31  */
  32
  33 #include <linux/list.h>
  34 #include <net/neighbour.h>
  35 #include <linux/notifier.h>
  36 #include <asm/atomic.h>
  37 #include <linux/proc_fs.h>
  38 #include <linux/if_vlan.h>
  39 #include <net/netevent.h>
  40 #include <linux/highmem.h>
  41 #include <linux/vmalloc.h>
  42
  43 #include "common.h"
  44 #include "regs.h"
  45 #include "cxgb3_ioctl.h"
  46 #include "cxgb3_ctl_defs.h"
  47 #include "cxgb3_defs.h"
  48 #include "l2t.h"
  49 #include "firmware_exports.h"
  50 #include "cxgb3_offload.h"
  51
  52 static LIST_HEAD(client_list);
  53 static LIST_HEAD(ofld_dev_list);
  54 static DEFINE_MUTEX(cxgb3_db_lock);
  55
  56 static DEFINE_RWLOCK(adapter_list_lock);
  57 static LIST_HEAD(adapter_list);
  58
  59 static const unsigned int MAX_ATIDS = 64 * 1024;
  60 static const unsigned int ATID_BASE = 0x10000;
  61
  62 static inline int offload_activated(struct t3cdev *tdev)
  63 {
  64         const struct adapter *adapter = tdev2adap(tdev);
  65
  66         return (test_bit(OFFLOAD_DEVMAP_BIT, &adapter->open_device_map));
  67 }
  68
  69 /**
  70  *      cxgb3_register_client - register an offload client
  71  *      @client: the client
  72  *
  73  *      Add the client to the client list,
  74  *      and call backs the client for each activated offload device
  75  */
  76 void cxgb3_register_client(struct cxgb3_client *client)
  77 {
  78         struct t3cdev *tdev;
  79
  80         mutex_lock(&cxgb3_db_lock);
  81         list_add_tail(&client->client_list, &client_list);
  82
  83         if (client->add) {
  84                 list_for_each_entry(tdev, &ofld_dev_list, ofld_dev_list) {
  85                         if (offload_activated(tdev))
  86                                 client->add(tdev);
  87                 }
  88         }
  89         mutex_unlock(&cxgb3_db_lock);
  90 }
  91
  92 EXPORT_SYMBOL(cxgb3_register_client);
  93
  94 /**
  95  *      cxgb3_unregister_client - unregister an offload client
  96  *      @client: the client
  97  *
  98  *      Remove the client to the client list,
  99  *      and call backs the client for each activated offload device.
 100  */
 101 void cxgb3_unregister_client(struct cxgb3_client *client)
 102 {
 103         struct t3cdev *tdev;
 104
 105         mutex_lock(&cxgb3_db_lock);
 106         list_del(&client->client_list);
 107
 108         if (client->remove) {
 109                 list_for_each_entry(tdev, &ofld_dev_list, ofld_dev_list) {
 110                         if (offload_activated(tdev))
 111                                 client->remove(tdev);
 112                 }
 113         }
 114         mutex_unlock(&cxgb3_db_lock);
 115 }
 116
 117 EXPORT_SYMBOL(cxgb3_unregister_client);
 118
 119 /**
 120  *      cxgb3_add_clients - activate registered clients for an offload device
 121  *      @tdev: the offload device
 122  *
 123  *      Call backs all registered clients once a offload device is activated
 124  */
 125 void cxgb3_add_clients(struct t3cdev *tdev)
 126 {
 127         struct cxgb3_client *client;
 128
 129         mutex_lock(&cxgb3_db_lock);
 130         list_for_each_entry(client, &client_list, client_list) {
 131                 if (client->add)
 132                         client->add(tdev);
 133         }
 134         mutex_unlock(&cxgb3_db_lock);
 135 }
 136
 137 /**
 138  *      cxgb3_remove_clients - deactivates registered clients
 139  *                             for an offload device
 140  *      @tdev: the offload device
 141  *
 142  *      Call backs all registered clients once a offload device is deactivated
 143  */
 144 void cxgb3_remove_clients(struct t3cdev *tdev)
 145 {
 146         struct cxgb3_client *client;
 147
 148         mutex_lock(&cxgb3_db_lock);
 149         list_for_each_entry(client, &client_list, client_list) {
 150                 if (client->remove)
 151                         client->remove(tdev);
 152         }
 153         mutex_unlock(&cxgb3_db_lock);
 154 }
 155
 156 static struct net_device *get_iff_from_mac(struct adapter *adapter,
 157                                            const unsigned char *mac,
 158                                            unsigned int vlan)
 159 {
 160         int i;
 161
 162         for_each_port(adapter, i) {
 163                 struct vlan_group *grp;
 164                 struct net_device *dev = adapter->port[i];
 165                 const struct port_info *p = netdev_priv(dev);
 166
 167                 if (!memcmp(dev->dev_addr, mac, ETH_ALEN)) {
 168                         if (vlan && vlan != VLAN_VID_MASK) {
 169                                 grp = p->vlan_grp;
 170                                 dev = NULL;
 171                                 if (grp)
 172                                         dev = vlan_group_get_device(grp, vlan);
 173                         } else
 174                                 while (dev->master)
 175                                         dev = dev->master;
 176                         return dev;
 177                 }
 178         }
 179         return NULL;
 180 }
 181
 182 static int cxgb_ulp_iscsi_ctl(struct adapter *adapter, unsigned int req,
 183                               void *data)
 184 {
 185         int i;
 186         int ret = 0;
 187         unsigned int val = 0;
 188         struct ulp_iscsi_info *uiip = data;
 189
 190         switch (req) {
 191         case ULP_ISCSI_GET_PARAMS:
 192                 uiip->pdev = adapter->pdev;
 193                 uiip->llimit = t3_read_reg(adapter, A_ULPRX_ISCSI_LLIMIT);
 194                 uiip->ulimit = t3_read_reg(adapter, A_ULPRX_ISCSI_ULIMIT);
 195                 uiip->tagmask = t3_read_reg(adapter, A_ULPRX_ISCSI_TAGMASK);
 196
 197                 val = t3_read_reg(adapter, A_ULPRX_ISCSI_PSZ);
 198                 for (i = 0; i < 4; i++, val >>= 8)
 199                         uiip->pgsz_factor[i] = val & 0xFF;
 200
 201                 val = t3_read_reg(adapter, A_TP_PARA_REG7);
 202                 uiip->max_txsz =
 203                 uiip->max_rxsz = min((val >> S_PMMAXXFERLEN0)&M_PMMAXXFERLEN0,
 204                                      (val >> S_PMMAXXFERLEN1)&M_PMMAXXFERLEN1);
 205                 /*
 206                  * On tx, the iscsi pdu has to be <= tx page size and has to
 207                  * fit into the Tx PM FIFO.
 208                  */
 209                 val = min(adapter->params.tp.tx_pg_size,
 210                           t3_read_reg(adapter, A_PM1_TX_CFG) >> 17);
 211                 uiip->max_txsz = min(val, uiip->max_txsz);
 212
 213                 /* set MaxRxData to 16224 */
 214                 val = t3_read_reg(adapter, A_TP_PARA_REG2);
 215                 if ((val >> S_MAXRXDATA) != 0x3f60) {
 216                         val &= (M_RXCOALESCESIZE << S_RXCOALESCESIZE);
 217                         val |= V_MAXRXDATA(0x3f60);
 218                         printk(KERN_INFO
 219                                 "%s, iscsi set MaxRxData to 16224 (0x%x).\n",
 220                                 adapter->name, val);
 221                         t3_write_reg(adapter, A_TP_PARA_REG2, val);
 222                 }
 223
 224                 /*
 225                  * on rx, the iscsi pdu has to be < rx page size and the
 226                  * the max rx data length programmed in TP
 227                  */
 228                 val = min(adapter->params.tp.rx_pg_size,
 229                           ((t3_read_reg(adapter, A_TP_PARA_REG2)) >>
 230                                 S_MAXRXDATA) & M_MAXRXDATA);
 231                 uiip->max_rxsz = min(val, uiip->max_rxsz);
 232                 break;
 233         case ULP_ISCSI_SET_PARAMS:
 234                 t3_write_reg(adapter, A_ULPRX_ISCSI_TAGMASK, uiip->tagmask);
 235                 /* program the ddp page sizes */
 236                 for (i = 0; i < 4; i++)
 237                         val |= (uiip->pgsz_factor[i] & 0xF) << (8 * i);
 238                 if (val && (val != t3_read_reg(adapter, A_ULPRX_ISCSI_PSZ))) {
 239                         printk(KERN_INFO
 240                                 "%s, setting iscsi pgsz 0x%x, %u,%u,%u,%u.\n",
 241                                 adapter->name, val, uiip->pgsz_factor[0],
 242                                 uiip->pgsz_factor[1], uiip->pgsz_factor[2],
 243                                 uiip->pgsz_factor[3]);
 244                         t3_write_reg(adapter, A_ULPRX_ISCSI_PSZ, val);
 245                 }
 246                 break;
 247         default:
 248                 ret = -EOPNOTSUPP;
 249         }
 250         return ret;
 251 }
 252
 253 /* Response queue used for RDMA events. */
 254 #define ASYNC_NOTIF_RSPQ 0
 255
 256 static int cxgb_rdma_ctl(struct adapter *adapter, unsigned int req, void *data)
 257 {
 258         int ret = 0;
 259
 260         switch (req) {
 261         case RDMA_GET_PARAMS: {
 262                 struct rdma_info *rdma = data;
 263                 struct pci_dev *pdev = adapter->pdev;
 264
 265                 rdma->udbell_physbase = pci_resource_start(pdev, 2);
 266                 rdma->udbell_len = pci_resource_len(pdev, 2);
 267                 rdma->tpt_base =
 268                         t3_read_reg(adapter, A_ULPTX_TPT_LLIMIT);
 269                 rdma->tpt_top = t3_read_reg(adapter, A_ULPTX_TPT_ULIMIT);
 270                 rdma->pbl_base =
 271                         t3_read_reg(adapter, A_ULPTX_PBL_LLIMIT);
 272                 rdma->pbl_top = t3_read_reg(adapter, A_ULPTX_PBL_ULIMIT);
 273                 rdma->rqt_base = t3_read_reg(adapter, A_ULPRX_RQ_LLIMIT);
 274                 rdma->rqt_top = t3_read_reg(adapter, A_ULPRX_RQ_ULIMIT);
 275                 rdma->kdb_addr = adapter->regs + A_SG_KDOORBELL;
 276                 rdma->pdev = pdev;
 277                 break;
 278         }
 279         case RDMA_CQ_OP:{
 280                 unsigned long flags;
 281                 struct rdma_cq_op *rdma = data;
 282
 283                 /* may be called in any context */
 284                 spin_lock_irqsave(&adapter->sge.reg_lock, flags);
 285                 ret = t3_sge_cqcntxt_op(adapter, rdma->id, rdma->op,
 286                                         rdma->credits);
 287                 spin_unlock_irqrestore(&adapter->sge.reg_lock, flags);
 288                 break;
 289         }
 290         case RDMA_GET_MEM:{
 291                 struct ch_mem_range *t = data;
 292                 struct mc7 *mem;
 293
 294                 if ((t->addr & 7) || (t->len & 7))
 295                         return -EINVAL;
 296                 if (t->mem_id == MEM_CM)
 297                         mem = &adapter->cm;
 298                 else if (t->mem_id == MEM_PMRX)
 299                         mem = &adapter->pmrx;
 300                 else if (t->mem_id == MEM_PMTX)
 301                         mem = &adapter->pmtx;
 302                 else
 303                         return -EINVAL;
 304
 305                 ret =
 306                         t3_mc7_bd_read(mem, t->addr / 8, t->len / 8,
 307                                         (u64 *) t->buf);
 308                 if (ret)
 309                         return ret;
 310                 break;
 311         }
 312         case RDMA_CQ_SETUP:{
 313                 struct rdma_cq_setup *rdma = data;
 314
 315                 spin_lock_irq(&adapter->sge.reg_lock);
 316                 ret =
 317                         t3_sge_init_cqcntxt(adapter, rdma->id,
 318                                         rdma->base_addr, rdma->size,
 319                                         ASYNC_NOTIF_RSPQ,
 320                                         rdma->ovfl_mode, rdma->credits,
 321                                         rdma->credit_thres);
 322                 spin_unlock_irq(&adapter->sge.reg_lock);
 323                 break;
 324         }
 325         case RDMA_CQ_DISABLE:
 326                 spin_lock_irq(&adapter->sge.reg_lock);
 327                 ret = t3_sge_disable_cqcntxt(adapter, *(unsigned int *)data);
 328                 spin_unlock_irq(&adapter->sge.reg_lock);
 329                 break;
 330         case RDMA_CTRL_QP_SETUP:{
 331                 struct rdma_ctrlqp_setup *rdma = data;
 332
 333                 spin_lock_irq(&adapter->sge.reg_lock);
 334                 ret = t3_sge_init_ecntxt(adapter, FW_RI_SGEEC_START, 0,
 335                                                 SGE_CNTXT_RDMA,
 336                                                 ASYNC_NOTIF_RSPQ,
 337                                                 rdma->base_addr, rdma->size,
 338                                                 FW_RI_TID_START, 1, 0);
 339                 spin_unlock_irq(&adapter->sge.reg_lock);
 340                 break;
 341         }
 342         case RDMA_GET_MIB: {
 343                 spin_lock(&adapter->stats_lock);
 344                 t3_tp_get_mib_stats(adapter, (struct tp_mib_stats *)data);
 345                 spin_unlock(&adapter->stats_lock);
 346                 break;
 347         }
 348         default:
 349                 ret = -EOPNOTSUPP;
 350         }
 351         return ret;
 352 }
 353
 354 static int cxgb_offload_ctl(struct t3cdev *tdev, unsigned int req, void *data)
 355 {
 356         struct adapter *adapter = tdev2adap(tdev);
 357         struct tid_range *tid;
 358         struct mtutab *mtup;
 359         struct iff_mac *iffmacp;
 360         struct ddp_params *ddpp;
 361         struct adap_ports *ports;
 362         struct ofld_page_info *rx_page_info;
 363         struct tp_params *tp = &adapter->params.tp;
 364         int i;
 365
 366         switch (req) {
 367         case GET_MAX_OUTSTANDING_WR:
 368                 *(unsigned int *)data = FW_WR_NUM;
 369                 break;
 370         case GET_WR_LEN:
 371                 *(unsigned int *)data = WR_FLITS;
 372                 break;
 373         case GET_TX_MAX_CHUNK:
 374                 *(unsigned int *)data = 1 << 20;        /* 1MB */
 375                 break;
 376         case GET_TID_RANGE:
 377                 tid = data;
 378                 tid->num = t3_mc5_size(&adapter->mc5) -
 379                     adapter->params.mc5.nroutes -
 380                     adapter->params.mc5.nfilters - adapter->params.mc5.nservers;
 381                 tid->base = 0;
 382                 break;
 383         case GET_STID_RANGE:
 384                 tid = data;
 385                 tid->num = adapter->params.mc5.nservers;
 386                 tid->base = t3_mc5_size(&adapter->mc5) - tid->num -
 387                     adapter->params.mc5.nfilters - adapter->params.mc5.nroutes;
 388                 break;
 389         case GET_L2T_CAPACITY:
 390                 *(unsigned int *)data = 2048;
 391                 break;
 392         case GET_MTUS:
 393                 mtup = data;
 394                 mtup->size = NMTUS;
 395                 mtup->mtus = adapter->params.mtus;
 396                 break;
 397         case GET_IFF_FROM_MAC:
 398                 iffmacp = data;
 399                 iffmacp->dev = get_iff_from_mac(adapter, iffmacp->mac_addr,
 400                                                 iffmacp->vlan_tag &
 401                                                 VLAN_VID_MASK);
 402                 break;
 403         case GET_DDP_PARAMS:
 404                 ddpp = data;
 405                 ddpp->llimit = t3_read_reg(adapter, A_ULPRX_TDDP_LLIMIT);
 406                 ddpp->ulimit = t3_read_reg(adapter, A_ULPRX_TDDP_ULIMIT);
 407                 ddpp->tag_mask = t3_read_reg(adapter, A_ULPRX_TDDP_TAGMASK);
 408                 break;
 409         case GET_PORTS:
 410                 ports = data;
 411                 ports->nports = adapter->params.nports;
 412                 for_each_port(adapter, i)
 413                         ports->lldevs[i] = adapter->port[i];
 414                 break;
 415         case ULP_ISCSI_GET_PARAMS:
 416         case ULP_ISCSI_SET_PARAMS:
 417                 if (!offload_running(adapter))
 418                         return -EAGAIN;
 419                 return cxgb_ulp_iscsi_ctl(adapter, req, data);
 420         case RDMA_GET_PARAMS:
 421         case RDMA_CQ_OP:
 422         case RDMA_CQ_SETUP:
 423         case RDMA_CQ_DISABLE:
 424         case RDMA_CTRL_QP_SETUP:
 425         case RDMA_GET_MEM:
 426         case RDMA_GET_MIB:
 427                 if (!offload_running(adapter))
 428                         return -EAGAIN;
 429                 return cxgb_rdma_ctl(adapter, req, data);
 430         case GET_RX_PAGE_INFO:
 431                 rx_page_info = data;
 432                 rx_page_info->page_size = tp->rx_pg_size;
 433                 rx_page_info->num = tp->rx_num_pgs;
 434                 break;
 435         case GET_ISCSI_IPV4ADDR: {
 436                 struct iscsi_ipv4addr *p = data;
 437                 struct port_info *pi = netdev_priv(p->dev);
 438                 p->ipv4addr = pi->iscsi_ipv4addr;
 439                 break;
 440         }
 441         case GET_EMBEDDED_INFO: {
 442                 struct ch_embedded_info *e = data;
 443
 444                 spin_lock(&adapter->stats_lock);
 445                 t3_get_fw_version(adapter, &e->fw_vers);
 446                 t3_get_tp_version(adapter, &e->tp_vers);
 447                 spin_unlock(&adapter->stats_lock);
 448                 break;
 449         }
 450         default:
 451                 return -EOPNOTSUPP;
 452         }
 453         return 0;
 454 }
 455
 456 /*
 457  * Dummy handler for Rx offload packets in case we get an offload packet before
 458  * proper processing is setup.  This complains and drops the packet as it isn't
 459  * normal to get offload packets at this stage.
 460  */
 461 static int rx_offload_blackhole(struct t3cdev *dev, struct sk_buff **skbs,
 462                                 int n)
 463 {
 464         while (n--)
 465                 dev_kfree_skb_any(skbs[n]);
 466         return 0;
 467 }
 468
 469 static void dummy_neigh_update(struct t3cdev *dev, struct neighbour *neigh)
 470 {
 471 }
 472
 473 void cxgb3_set_dummy_ops(struct t3cdev *dev)
 474 {
 475         dev->recv = rx_offload_blackhole;
 476         dev->neigh_update = dummy_neigh_update;
 477 }
 478
 479 /*
 480  * Free an active-open TID.
 481  */
 482 void *cxgb3_free_atid(struct t3cdev *tdev, int atid)
 483 {
 484         struct tid_info *t = &(T3C_DATA(tdev))->tid_maps;
 485         union active_open_entry *p = atid2entry(t, atid);
 486         void *ctx = p->t3c_tid.ctx;
 487
 488         spin_lock_bh(&t->atid_lock);
 489         p->next = t->afree;
 490         t->afree = p;
 491         t->atids_in_use--;
 492         spin_unlock_bh(&t->atid_lock);
 493
 494         return ctx;
 495 }
 496
 497 EXPORT_SYMBOL(cxgb3_free_atid);
 498
 499 /*
 500  * Free a server TID and return it to the free pool.
 501  */
 502 void cxgb3_free_stid(struct t3cdev *tdev, int stid)
 503 {
 504         struct tid_info *t = &(T3C_DATA(tdev))->tid_maps;
 505         union listen_entry *p = stid2entry(t, stid);
 506
 507         spin_lock_bh(&t->stid_lock);
 508         p->next = t->sfree;
 509         t->sfree = p;
 510         t->stids_in_use--;
 511         spin_unlock_bh(&t->stid_lock);
 512 }
 513
 514 EXPORT_SYMBOL(cxgb3_free_stid);
 515
 516 void cxgb3_insert_tid(struct t3cdev *tdev, struct cxgb3_client *client,
 517                       void *ctx, unsigned int tid)
 518 {
 519         struct tid_info *t = &(T3C_DATA(tdev))->tid_maps;
 520
 521         t->tid_tab[tid].client = client;
 522         t->tid_tab[tid].ctx = ctx;
 523         atomic_inc(&t->tids_in_use);
 524 }
 525
 526 EXPORT_SYMBOL(cxgb3_insert_tid);
 527
 528 /*
 529  * Populate a TID_RELEASE WR.  The skb must be already propely sized.
 530  */
 531 static inline void mk_tid_release(struct sk_buff *skb, unsigned int tid)
 532 {
 533         struct cpl_tid_release *req;
 534
 535         skb->priority = CPL_PRIORITY_SETUP;
 536         req = (struct cpl_tid_release *)__skb_put(skb, sizeof(*req));
 537         req->wr.wr_hi = htonl(V_WR_OP(FW_WROPCODE_FORWARD));
 538         OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_TID_RELEASE, tid));
 539 }
 540
 541 static void t3_process_tid_release_list(struct work_struct *work)
 542 {
 543         struct t3c_data *td = container_of(work, struct t3c_data,
 544                                            tid_release_task);
 545         struct sk_buff *skb;
 546         struct t3cdev *tdev = td->dev;
 547
 548
 549         spin_lock_bh(&td->tid_release_lock);
 550         while (td->tid_release_list) {
 551                 struct t3c_tid_entry *p = td->tid_release_list;
 552
 553                 td->tid_release_list = (struct t3c_tid_entry *)p->ctx;
 554                 spin_unlock_bh(&td->tid_release_lock);
 555
 556                 skb = alloc_skb(sizeof(struct cpl_tid_release),
 557                                 GFP_KERNEL | __GFP_NOFAIL);
 558                 mk_tid_release(skb, p - td->tid_maps.tid_tab);
 559                 cxgb3_ofld_send(tdev, skb);
 560                 p->ctx = NULL;
 561                 spin_lock_bh(&td->tid_release_lock);
 562         }
 563         spin_unlock_bh(&td->tid_release_lock);
 564 }
 565
 566 /* use ctx as a next pointer in the tid release list */
 567 void cxgb3_queue_tid_release(struct t3cdev *tdev, unsigned int tid)
 568 {
 569         struct t3c_data *td = T3C_DATA(tdev);
 570         struct t3c_tid_entry *p = &td->tid_maps.tid_tab[tid];
 571
 572         spin_lock_bh(&td->tid_release_lock);
 573         p->ctx = (void *)td->tid_release_list;
 574         p->client = NULL;
 575         td->tid_release_list = p;
 576         if (!p->ctx)
 577                 schedule_work(&td->tid_release_task);
 578         spin_unlock_bh(&td->tid_release_lock);
 579 }
 580
 581 EXPORT_SYMBOL(cxgb3_queue_tid_release);
 582
 583 /*
 584  * Remove a tid from the TID table.  A client may defer processing its last
 585  * CPL message if it is locked at the time it arrives, and while the message
 586  * sits in the client's backlog the TID may be reused for another connection.
 587  * To handle this we atomically switch the TID association if it still points
 588  * to the original client context.
 589  */
 590 void cxgb3_remove_tid(struct t3cdev *tdev, void *ctx, unsigned int tid)
 591 {
 592         struct tid_info *t = &(T3C_DATA(tdev))->tid_maps;
 593
 594         BUG_ON(tid >= t->ntids);
 595         if (tdev->type == T3A)
 596                 (void)cmpxchg(&t->tid_tab[tid].ctx, ctx, NULL);
 597         else {
 598                 struct sk_buff *skb;
 599
 600                 skb = alloc_skb(sizeof(struct cpl_tid_release), GFP_ATOMIC);
 601                 if (likely(skb)) {
 602                         mk_tid_release(skb, tid);
 603                         cxgb3_ofld_send(tdev, skb);
 604                         t->tid_tab[tid].ctx = NULL;
 605                 } else
 606                         cxgb3_queue_tid_release(tdev, tid);
 607         }
 608         atomic_dec(&t->tids_in_use);
 609 }
 610
 611 EXPORT_SYMBOL(cxgb3_remove_tid);
 612
 613 int cxgb3_alloc_atid(struct t3cdev *tdev, struct cxgb3_client *client,
 614                      void *ctx)
 615 {
 616         int atid = -1;
 617         struct tid_info *t = &(T3C_DATA(tdev))->tid_maps;
 618
 619         spin_lock_bh(&t->atid_lock);
 620         if (t->afree &&
 621             t->atids_in_use + atomic_read(&t->tids_in_use) + MC5_MIN_TIDS <=
 622             t->ntids) {
 623                 union active_open_entry *p = t->afree;
 624
 625                 atid = (p - t->atid_tab) + t->atid_base;
 626                 t->afree = p->next;
 627                 p->t3c_tid.ctx = ctx;
 628                 p->t3c_tid.client = client;
 629                 t->atids_in_use++;
 630         }
 631         spin_unlock_bh(&t->atid_lock);
 632         return atid;
 633 }
 634
 635 EXPORT_SYMBOL(cxgb3_alloc_atid);
 636
 637 int cxgb3_alloc_stid(struct t3cdev *tdev, struct cxgb3_client *client,
 638                      void *ctx)
 639 {
 640         int stid = -1;
 641         struct tid_info *t = &(T3C_DATA(tdev))->tid_maps;
 642
 643         spin_lock_bh(&t->stid_lock);
 644         if (t->sfree) {
 645                 union listen_entry *p = t->sfree;
 646
 647                 stid = (p - t->stid_tab) + t->stid_base;
 648                 t->sfree = p->next;
 649                 p->t3c_tid.ctx = ctx;
 650                 p->t3c_tid.client = client;
 651                 t->stids_in_use++;
 652         }
 653         spin_unlock_bh(&t->stid_lock);
 654         return stid;
 655 }
 656
 657 EXPORT_SYMBOL(cxgb3_alloc_stid);
 658
 659 /* Get the t3cdev associated with a net_device */
 660 struct t3cdev *dev2t3cdev(struct net_device *dev)
 661 {
 662         const struct port_info *pi = netdev_priv(dev);
 663
 664         return (struct t3cdev *)pi->adapter;
 665 }
 666
 667 EXPORT_SYMBOL(dev2t3cdev);
 668
 669 static int do_smt_write_rpl(struct t3cdev *dev, struct sk_buff *skb)
 670 {
 671         struct cpl_smt_write_rpl *rpl = cplhdr(skb);
 672
 673         if (rpl->status != CPL_ERR_NONE)
 674                 printk(KERN_ERR
 675                        "Unexpected SMT_WRITE_RPL status %u for entry %u\n",
 676                        rpl->status, GET_TID(rpl));
 677
 678         return CPL_RET_BUF_DONE;
 679 }
 680
 681 static int do_l2t_write_rpl(struct t3cdev *dev, struct sk_buff *skb)
 682 {
 683         struct cpl_l2t_write_rpl *rpl = cplhdr(skb);
 684
 685         if (rpl->status != CPL_ERR_NONE)
 686                 printk(KERN_ERR
 687                        "Unexpected L2T_WRITE_RPL status %u for entry %u\n",
 688                        rpl->status, GET_TID(rpl));
 689
 690         return CPL_RET_BUF_DONE;
 691 }
 692
 693 static int do_rte_write_rpl(struct t3cdev *dev, struct sk_buff *skb)
 694 {
 695         struct cpl_rte_write_rpl *rpl = cplhdr(skb);
 696
 697         if (rpl->status != CPL_ERR_NONE)
 698                 printk(KERN_ERR
 699                        "Unexpected RTE_WRITE_RPL status %u for entry %u\n",
 700                        rpl->status, GET_TID(rpl));
 701
 702         return CPL_RET_BUF_DONE;
 703 }
 704
 705 static int do_act_open_rpl(struct t3cdev *dev, struct sk_buff *skb)
 706 {
 707         struct cpl_act_open_rpl *rpl = cplhdr(skb);
 708         unsigned int atid = G_TID(ntohl(rpl->atid));
 709         struct t3c_tid_entry *t3c_tid;
 710
 711         t3c_tid = lookup_atid(&(T3C_DATA(dev))->tid_maps, atid);
 712         if (t3c_tid && t3c_tid->ctx && t3c_tid->client &&
 713             t3c_tid->client->handlers &&
 714             t3c_tid->client->handlers[CPL_ACT_OPEN_RPL]) {
 715                 return t3c_tid->client->handlers[CPL_ACT_OPEN_RPL] (dev, skb,
 716                                                                     t3c_tid->
 717                                                                     ctx);
 718         } else {
 719                 printk(KERN_ERR "%s: received clientless CPL command 0x%x\n",
 720                        dev->name, CPL_ACT_OPEN_RPL);
 721                 return CPL_RET_BUF_DONE | CPL_RET_BAD_MSG;
 722         }
 723 }
 724
 725 static int do_stid_rpl(struct t3cdev *dev, struct sk_buff *skb)
 726 {
 727         union opcode_tid *p = cplhdr(skb);
 728         unsigned int stid = G_TID(ntohl(p->opcode_tid));
 729         struct t3c_tid_entry *t3c_tid;
 730
 731         t3c_tid = lookup_stid(&(T3C_DATA(dev))->tid_maps, stid);
 732         if (t3c_tid && t3c_tid->ctx && t3c_tid->client->handlers &&
 733             t3c_tid->client->handlers[p->opcode]) {
 734                 return t3c_tid->client->handlers[p->opcode] (dev, skb,
 735                                                              t3c_tid->ctx);
 736         } else {
 737                 printk(KERN_ERR "%s: received clientless CPL command 0x%x\n",
 738                        dev->name, p->opcode);
 739                 return CPL_RET_BUF_DONE | CPL_RET_BAD_MSG;
 740         }
 741 }
 742
 743 static int do_hwtid_rpl(struct t3cdev *dev, struct sk_buff *skb)
 744 {
 745         union opcode_tid *p = cplhdr(skb);
 746         unsigned int hwtid = G_TID(ntohl(p->opcode_tid));
 747         struct t3c_tid_entry *t3c_tid;
 748
 749         t3c_tid = lookup_tid(&(T3C_DATA(dev))->tid_maps, hwtid);
 750         if (t3c_tid && t3c_tid->ctx && t3c_tid->client->handlers &&
 751             t3c_tid->client->handlers[p->opcode]) {
 752                 return t3c_tid->client->handlers[p->opcode]
 753                     (dev, skb, t3c_tid->ctx);
 754         } else {
 755                 printk(KERN_ERR "%s: received clientless CPL command 0x%x\n",
 756                        dev->name, p->opcode);
 757                 return CPL_RET_BUF_DONE | CPL_RET_BAD_MSG;
 758         }
 759 }
 760
 761 static int do_cr(struct t3cdev *dev, struct sk_buff *skb)
 762 {
 763         struct cpl_pass_accept_req *req = cplhdr(skb);
 764         unsigned int stid = G_PASS_OPEN_TID(ntohl(req->tos_tid));
 765         struct tid_info *t = &(T3C_DATA(dev))->tid_maps;
 766         struct t3c_tid_entry *t3c_tid;
 767         unsigned int tid = GET_TID(req);
 768
 769         if (unlikely(tid >= t->ntids)) {
 770                 printk("%s: passive open TID %u too large\n",
 771                        dev->name, tid);
 772                 t3_fatal_err(tdev2adap(dev));
 773                 return CPL_RET_BUF_DONE;
 774         }
 775
 776         t3c_tid = lookup_stid(t, stid);
 777         if (t3c_tid && t3c_tid->ctx && t3c_tid->client->handlers &&
 778             t3c_tid->client->handlers[CPL_PASS_ACCEPT_REQ]) {
 779                 return t3c_tid->client->handlers[CPL_PASS_ACCEPT_REQ]
 780                     (dev, skb, t3c_tid->ctx);
 781         } else {
 782                 printk(KERN_ERR "%s: received clientless CPL command 0x%x\n",
 783                        dev->name, CPL_PASS_ACCEPT_REQ);
 784                 return CPL_RET_BUF_DONE | CPL_RET_BAD_MSG;
 785         }
 786 }
 787
 788 /*
 789  * Returns an sk_buff for a reply CPL message of size len.  If the input
 790  * sk_buff has no other users it is trimmed and reused, otherwise a new buffer
 791  * is allocated.  The input skb must be of size at least len.  Note that this
 792  * operation does not destroy the original skb data even if it decides to reuse
 793  * the buffer.
 794  */
 795 static struct sk_buff *cxgb3_get_cpl_reply_skb(struct sk_buff *skb, size_t len,
 796                                                gfp_t gfp)
 797 {
 798         if (likely(!skb_cloned(skb))) {
 799                 BUG_ON(skb->len < len);
 800                 __skb_trim(skb, len);
 801                 skb_get(skb);
 802         } else {
 803                 skb = alloc_skb(len, gfp);
 804                 if (skb)
 805                         __skb_put(skb, len);
 806         }
 807         return skb;
 808 }
 809
 810 static int do_abort_req_rss(struct t3cdev *dev, struct sk_buff *skb)
 811 {
 812         union opcode_tid *p = cplhdr(skb);
 813         unsigned int hwtid = G_TID(ntohl(p->opcode_tid));
 814         struct t3c_tid_entry *t3c_tid;
 815
 816         t3c_tid = lookup_tid(&(T3C_DATA(dev))->tid_maps, hwtid);
 817         if (t3c_tid && t3c_tid->ctx && t3c_tid->client->handlers &&
 818             t3c_tid->client->handlers[p->opcode]) {
 819                 return t3c_tid->client->handlers[p->opcode]
 820                     (dev, skb, t3c_tid->ctx);
 821         } else {
 822                 struct cpl_abort_req_rss *req = cplhdr(skb);
 823                 struct cpl_abort_rpl *rpl;
 824                 struct sk_buff *reply_skb;
 825                 unsigned int tid = GET_TID(req);
 826                 u8 cmd = req->status;
 827
 828                 if (req->status == CPL_ERR_RTX_NEG_ADVICE ||
 829                     req->status == CPL_ERR_PERSIST_NEG_ADVICE)
 830                         goto out;
 831
 832                 reply_skb = cxgb3_get_cpl_reply_skb(skb,
 833                                                     sizeof(struct
 834                                                            cpl_abort_rpl),
 835                                                     GFP_ATOMIC);
 836
 837                 if (!reply_skb) {
 838                         printk("do_abort_req_rss: couldn't get skb!\n");
 839                         goto out;
 840                 }
 841                 reply_skb->priority = CPL_PRIORITY_DATA;
 842                 __skb_put(reply_skb, sizeof(struct cpl_abort_rpl));
 843                 rpl = cplhdr(reply_skb);
 844                 rpl->wr.wr_hi =
 845                     htonl(V_WR_OP(FW_WROPCODE_OFLD_HOST_ABORT_CON_RPL));
 846                 rpl->wr.wr_lo = htonl(V_WR_TID(tid));
 847                 OPCODE_TID(rpl) = htonl(MK_OPCODE_TID(CPL_ABORT_RPL, tid));
 848                 rpl->cmd = cmd;
 849                 cxgb3_ofld_send(dev, reply_skb);
 850 out:
 851                 return CPL_RET_BUF_DONE;
 852         }
 853 }
 854
 855 static int do_act_establish(struct t3cdev *dev, struct sk_buff *skb)
 856 {
 857         struct cpl_act_establish *req = cplhdr(skb);
 858         unsigned int atid = G_PASS_OPEN_TID(ntohl(req->tos_tid));
 859         struct tid_info *t = &(T3C_DATA(dev))->tid_maps;
 860         struct t3c_tid_entry *t3c_tid;
 861         unsigned int tid = GET_TID(req);
 862
 863         if (unlikely(tid >= t->ntids)) {
 864                 printk("%s: active establish TID %u too large\n",
 865                        dev->name, tid);
 866                 t3_fatal_err(tdev2adap(dev));
 867                 return CPL_RET_BUF_DONE;
 868         }
 869
 870         t3c_tid = lookup_atid(t, atid);
 871         if (t3c_tid && t3c_tid->ctx && t3c_tid->client->handlers &&
 872             t3c_tid->client->handlers[CPL_ACT_ESTABLISH]) {
 873                 return t3c_tid->client->handlers[CPL_ACT_ESTABLISH]
 874                     (dev, skb, t3c_tid->ctx);
 875         } else {
 876                 printk(KERN_ERR "%s: received clientless CPL command 0x%x\n",
 877                        dev->name, CPL_ACT_ESTABLISH);
 878                 return CPL_RET_BUF_DONE | CPL_RET_BAD_MSG;
 879         }
 880 }
 881
 882 static int do_trace(struct t3cdev *dev, struct sk_buff *skb)
 883 {
 884         struct cpl_trace_pkt *p = cplhdr(skb);
 885
 886         skb->protocol = htons(0xffff);
 887         skb->dev = dev->lldev;
 888         skb_pull(skb, sizeof(*p));
 889         skb_reset_mac_header(skb);
 890         netif_receive_skb(skb);
 891         return 0;
 892 }
 893
 894 /*
 895  * That skb would better have come from process_responses() where we abuse
 896  * ->priority and ->csum to carry our data.  NB: if we get to per-arch
 897  * ->csum, the things might get really interesting here.
 898  */
 899
 900 static inline u32 get_hwtid(struct sk_buff *skb)
 901 {
 902         return ntohl((__force __be32)skb->priority) >> 8 & 0xfffff;
 903 }
 904
 905 static inline u32 get_opcode(struct sk_buff *skb)
 906 {
 907         return G_OPCODE(ntohl((__force __be32)skb->csum));
 908 }
 909
 910 static int do_term(struct t3cdev *dev, struct sk_buff *skb)
 911 {
 912         unsigned int hwtid = get_hwtid(skb);
 913         unsigned int opcode = get_opcode(skb);
 914         struct t3c_tid_entry *t3c_tid;
 915
 916         t3c_tid = lookup_tid(&(T3C_DATA(dev))->tid_maps, hwtid);
 917         if (t3c_tid && t3c_tid->ctx && t3c_tid->client->handlers &&
 918             t3c_tid->client->handlers[opcode]) {
 919                 return t3c_tid->client->handlers[opcode] (dev, skb,
 920                                                           t3c_tid->ctx);
 921         } else {
 922                 printk(KERN_ERR "%s: received clientless CPL command 0x%x\n",
 923                        dev->name, opcode);
 924                 return CPL_RET_BUF_DONE | CPL_RET_BAD_MSG;
 925         }
 926 }
 927
 928 static int nb_callback(struct notifier_block *self, unsigned long event,
 929                        void *ctx)
 930 {
 931         switch (event) {
 932         case (NETEVENT_NEIGH_UPDATE):{
 933                 cxgb_neigh_update((struct neighbour *)ctx);
 934                 break;
 935         }
 936         case (NETEVENT_PMTU_UPDATE):
 937                 break;
 938         case (NETEVENT_REDIRECT):{
 939                 struct netevent_redirect *nr = ctx;
 940                 cxgb_redirect(nr->old, nr->new);
 941                 cxgb_neigh_update(nr->new->neighbour);
 942                 break;
 943         }
 944         default:
 945                 break;
 946         }
 947         return 0;
 948 }
 949
 950 static struct notifier_block nb = {
 951         .notifier_call = nb_callback
 952 };
 953
 954 /*
 955  * Process a received packet with an unknown/unexpected CPL opcode.
 956  */
 957 static int do_bad_cpl(struct t3cdev *dev, struct sk_buff *skb)
 958 {
 959         printk(KERN_ERR "%s: received bad CPL command 0x%x\n", dev->name,
 960                *skb->data);
 961         return CPL_RET_BUF_DONE | CPL_RET_BAD_MSG;
 962 }
 963
 964 /*
 965  * Handlers for each CPL opcode
 966  */
 967 static cpl_handler_func cpl_handlers[NUM_CPL_CMDS];
 968
 969 /*
 970  * Add a new handler to the CPL dispatch table.  A NULL handler may be supplied
 971  * to unregister an existing handler.
 972  */
 973 void t3_register_cpl_handler(unsigned int opcode, cpl_handler_func h)
 974 {
 975         if (opcode < NUM_CPL_CMDS)
 976                 cpl_handlers[opcode] = h ? h : do_bad_cpl;
 977         else
 978                 printk(KERN_ERR "T3C: handler registration for "
 979                        "opcode %x failed\n", opcode);
 980 }
 981
 982 EXPORT_SYMBOL(t3_register_cpl_handler);
 983
 984 /*
 985  * T3CDEV's receive method.
 986  */
 987 int process_rx(struct t3cdev *dev, struct sk_buff **skbs, int n)
 988 {
 989         while (n--) {
 990                 struct sk_buff *skb = *skbs++;
 991                 unsigned int opcode = get_opcode(skb);
 992                 int ret = cpl_handlers[opcode] (dev, skb);
 993
 994 #if VALIDATE_TID
 995                 if (ret & CPL_RET_UNKNOWN_TID) {
 996                         union opcode_tid *p = cplhdr(skb);
 997
 998                         printk(KERN_ERR "%s: CPL message (opcode %u) had "
 999                                "unknown TID %u\n", dev->name, opcode,
1000                                G_TID(ntohl(p->opcode_tid)));
1001                 }
1002 #endif
1003                 if (ret & CPL_RET_BUF_DONE)
1004                         kfree_skb(skb);
1005         }
1006         return 0;
1007 }
1008
1009 /*
1010  * Sends an sk_buff to a T3C driver after dealing with any active network taps.
1011  */
1012 int cxgb3_ofld_send(struct t3cdev *dev, struct sk_buff *skb)
1013 {
1014         int r;
1015
1016         local_bh_disable();
1017         r = dev->send(dev, skb);
1018         local_bh_enable();
1019         return r;
1020 }
1021
1022 EXPORT_SYMBOL(cxgb3_ofld_send);
1023
1024 static int is_offloading(struct net_device *dev)
1025 {
1026         struct adapter *adapter;
1027         int i;
1028
1029         read_lock_bh(&adapter_list_lock);
1030         list_for_each_entry(adapter, &adapter_list, adapter_list) {
1031                 for_each_port(adapter, i) {
1032                         if (dev == adapter->port[i]) {
1033                                 read_unlock_bh(&adapter_list_lock);
1034                                 return 1;
1035                         }
1036                 }
1037         }
1038         read_unlock_bh(&adapter_list_lock);
1039         return 0;
1040 }
1041
1042 void cxgb_neigh_update(struct neighbour *neigh)
1043 {
1044         struct net_device *dev = neigh->dev;
1045
1046         if (dev && (is_offloading(dev))) {
1047                 struct t3cdev *tdev = dev2t3cdev(dev);
1048
1049                 BUG_ON(!tdev);
1050                 t3_l2t_update(tdev, neigh);
1051         }
1052 }
1053
1054 static void set_l2t_ix(struct t3cdev *tdev, u32 tid, struct l2t_entry *e)
1055 {
1056         struct sk_buff *skb;
1057         struct cpl_set_tcb_field *req;
1058
1059         skb = alloc_skb(sizeof(*req), GFP_ATOMIC);
1060         if (!skb) {
1061                 printk(KERN_ERR "%s: cannot allocate skb!\n", __func__);
1062                 return;
1063         }
1064         skb->priority = CPL_PRIORITY_CONTROL;
1065         req = (struct cpl_set_tcb_field *)skb_put(skb, sizeof(*req));
1066         req->wr.wr_hi = htonl(V_WR_OP(FW_WROPCODE_FORWARD));
1067         OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_SET_TCB_FIELD, tid));
1068         req->reply = 0;
1069         req->cpu_idx = 0;
1070         req->word = htons(W_TCB_L2T_IX);
1071         req->mask = cpu_to_be64(V_TCB_L2T_IX(M_TCB_L2T_IX));
1072         req->val = cpu_to_be64(V_TCB_L2T_IX(e->idx));
1073         tdev->send(tdev, skb);
1074 }
1075
1076 void cxgb_redirect(struct dst_entry *old, struct dst_entry *new)
1077 {
1078         struct net_device *olddev, *newdev;
1079         struct tid_info *ti;
1080         struct t3cdev *tdev;
1081         u32 tid;
1082         int update_tcb;
1083         struct l2t_entry *e;
1084         struct t3c_tid_entry *te;
1085
1086         olddev = old->neighbour->dev;
1087         newdev = new->neighbour->dev;
1088         if (!is_offloading(olddev))
1089                 return;
1090         if (!is_offloading(newdev)) {
1091                 printk(KERN_WARNING "%s: Redirect to non-offload "
1092                        "device ignored.\n", __func__);
1093                 return;
1094         }
1095         tdev = dev2t3cdev(olddev);
1096         BUG_ON(!tdev);
1097         if (tdev != dev2t3cdev(newdev)) {
1098                 printk(KERN_WARNING "%s: Redirect to different "
1099                        "offload device ignored.\n", __func__);
1100                 return;
1101         }
1102
1103         /* Add new L2T entry */
1104         e = t3_l2t_get(tdev, new->neighbour, newdev);
1105         if (!e) {
1106                 printk(KERN_ERR "%s: couldn't allocate new l2t entry!\n",
1107                        __func__);
1108                 return;
1109         }
1110
1111         /* Walk tid table and notify clients of dst change. */
1112         ti = &(T3C_DATA(tdev))->tid_maps;
1113         for (tid = 0; tid < ti->ntids; tid++) {
1114                 te = lookup_tid(ti, tid);
1115                 BUG_ON(!te);
1116                 if (te && te->ctx && te->client && te->client->redirect) {
1117                         update_tcb = te->client->redirect(te->ctx, old, new, e);
1118                         if (update_tcb) {
1119                                 l2t_hold(L2DATA(tdev), e);
1120                                 set_l2t_ix(tdev, tid, e);
1121                         }
1122                 }
1123         }
1124         l2t_release(L2DATA(tdev), e);
1125 }
1126
1127 /*
1128  * Allocate a chunk of memory using kmalloc or, if that fails, vmalloc.
1129  * The allocated memory is cleared.
1130  */
1131 void *cxgb_alloc_mem(unsigned long size)
1132 {
1133         void *p = kmalloc(size, GFP_KERNEL);
1134
1135         if (!p)
1136                 p = vmalloc(size);
1137         if (p)
1138                 memset(p, 0, size);
1139         return p;
1140 }
1141
1142 /*
1143  * Free memory allocated through t3_alloc_mem().
1144  */
1145 void cxgb_free_mem(void *addr)
1146 {
1147         if (is_vmalloc_addr(addr))
1148                 vfree(addr);
1149         else
1150                 kfree(addr);
1151 }
1152
1153 /*
1154  * Allocate and initialize the TID tables.  Returns 0 on success.
1155  */
1156 static int init_tid_tabs(struct tid_info *t, unsigned int ntids,
1157                          unsigned int natids, unsigned int nstids,
1158                          unsigned int atid_base, unsigned int stid_base)
1159 {
1160         unsigned long size = ntids * sizeof(*t->tid_tab) +
1161             natids * sizeof(*t->atid_tab) + nstids * sizeof(*t->stid_tab);
1162
1163         t->tid_tab = cxgb_alloc_mem(size);
1164         if (!t->tid_tab)
1165                 return -ENOMEM;
1166
1167         t->stid_tab = (union listen_entry *)&t->tid_tab[ntids];
1168         t->atid_tab = (union active_open_entry *)&t->stid_tab[nstids];
1169         t->ntids = ntids;
1170         t->nstids = nstids;
1171         t->stid_base = stid_base;
1172         t->sfree = NULL;
1173         t->natids = natids;
1174         t->atid_base = atid_base;
1175         t->afree = NULL;
1176         t->stids_in_use = t->atids_in_use = 0;
1177         atomic_set(&t->tids_in_use, 0);
1178         spin_lock_init(&t->stid_lock);
1179         spin_lock_init(&t->atid_lock);
1180
1181         /*
1182          * Setup the free lists for stid_tab and atid_tab.
1183          */
1184         if (nstids) {
1185                 while (--nstids)
1186                         t->stid_tab[nstids - 1].next = &t->stid_tab[nstids];
1187                 t->sfree = t->stid_tab;
1188         }
1189         if (natids) {
1190                 while (--natids)
1191                         t->atid_tab[natids - 1].next = &t->atid_tab[natids];
1192                 t->afree = t->atid_tab;
1193         }
1194         return 0;
1195 }
1196
1197 static void free_tid_maps(struct tid_info *t)
1198 {
1199         cxgb_free_mem(t->tid_tab);
1200 }
1201
1202 static inline void add_adapter(struct adapter *adap)
1203 {
1204         write_lock_bh(&adapter_list_lock);
1205         list_add_tail(&adap->adapter_list, &adapter_list);
1206         write_unlock_bh(&adapter_list_lock);
1207 }
1208
1209 static inline void remove_adapter(struct adapter *adap)
1210 {
1211         write_lock_bh(&adapter_list_lock);
1212         list_del(&adap->adapter_list);
1213         write_unlock_bh(&adapter_list_lock);
1214 }
1215
1216 int cxgb3_offload_activate(struct adapter *adapter)
1217 {
1218         struct t3cdev *dev = &adapter->tdev;
1219         int natids, err;
1220         struct t3c_data *t;
1221         struct tid_range stid_range, tid_range;
1222         struct mtutab mtutab;
1223         unsigned int l2t_capacity;
1224
1225         t = kcalloc(1, sizeof(*t), GFP_KERNEL);
1226         if (!t)
1227                 return -ENOMEM;
1228
1229         err = -EOPNOTSUPP;
1230         if (dev->ctl(dev, GET_TX_MAX_CHUNK, &t->tx_max_chunk) < 0 ||
1231             dev->ctl(dev, GET_MAX_OUTSTANDING_WR, &t->max_wrs) < 0 ||
1232             dev->ctl(dev, GET_L2T_CAPACITY, &l2t_capacity) < 0 ||
1233             dev->ctl(dev, GET_MTUS, &mtutab) < 0 ||
1234             dev->ctl(dev, GET_TID_RANGE, &tid_range) < 0 ||
1235             dev->ctl(dev, GET_STID_RANGE, &stid_range) < 0)
1236                 goto out_free;
1237
1238         err = -ENOMEM;
1239         L2DATA(dev) = t3_init_l2t(l2t_capacity);
1240         if (!L2DATA(dev))
1241                 goto out_free;
1242
1243         natids = min(tid_range.num / 2, MAX_ATIDS);
1244         err = init_tid_tabs(&t->tid_maps, tid_range.num, natids,
1245                             stid_range.num, ATID_BASE, stid_range.base);
1246         if (err)
1247                 goto out_free_l2t;
1248
1249         t->mtus = mtutab.mtus;
1250         t->nmtus = mtutab.size;
1251
1252         INIT_WORK(&t->tid_release_task, t3_process_tid_release_list);
1253         spin_lock_init(&t->tid_release_lock);
1254         INIT_LIST_HEAD(&t->list_node);
1255         t->dev = dev;
1256
1257         T3C_DATA(dev) = t;
1258         dev->recv = process_rx;
1259         dev->neigh_update = t3_l2t_update;
1260
1261         /* Register netevent handler once */
1262         if (list_empty(&adapter_list))
1263                 register_netevent_notifier(&nb);
1264
1265         add_adapter(adapter);
1266         return 0;
1267
1268 out_free_l2t:
1269         t3_free_l2t(L2DATA(dev));
1270         L2DATA(dev) = NULL;
1271 out_free:
1272         kfree(t);
1273         return err;
1274 }
1275
1276 void cxgb3_offload_deactivate(struct adapter *adapter)
1277 {
1278         struct t3cdev *tdev = &adapter->tdev;
1279         struct t3c_data *t = T3C_DATA(tdev);
1280
1281         remove_adapter(adapter);
1282         if (list_empty(&adapter_list))
1283                 unregister_netevent_notifier(&nb);
1284
1285         free_tid_maps(&t->tid_maps);
1286         T3C_DATA(tdev) = NULL;
1287         t3_free_l2t(L2DATA(tdev));
1288         L2DATA(tdev) = NULL;
1289         kfree(t);
1290 }
1291
1292 static inline void register_tdev(struct t3cdev *tdev)
1293 {
1294         static int unit;
1295
1296         mutex_lock(&cxgb3_db_lock);
1297         snprintf(tdev->name, sizeof(tdev->name), "ofld_dev%d", unit++);
1298         list_add_tail(&tdev->ofld_dev_list, &ofld_dev_list);
1299         mutex_unlock(&cxgb3_db_lock);
1300 }
1301
1302 static inline void unregister_tdev(struct t3cdev *tdev)
1303 {
1304         mutex_lock(&cxgb3_db_lock);
1305         list_del(&tdev->ofld_dev_list);
1306         mutex_unlock(&cxgb3_db_lock);
1307 }
1308
1309 static inline int adap2type(struct adapter *adapter)
1310 {
1311         int type = 0;
1312
1313         switch (adapter->params.rev) {
1314         case T3_REV_A:
1315                 type = T3A;
1316                 break;
1317         case T3_REV_B:
1318         case T3_REV_B2:
1319                 type = T3B;
1320                 break;
1321         case T3_REV_C:
1322                 type = T3C;
1323                 break;
1324         }
1325         return type;
1326 }
1327
1328 void __devinit cxgb3_adapter_ofld(struct adapter *adapter)
1329 {
1330         struct t3cdev *tdev = &adapter->tdev;
1331
1332         INIT_LIST_HEAD(&tdev->ofld_dev_list);
1333
1334         cxgb3_set_dummy_ops(tdev);
1335         tdev->send = t3_offload_tx;
1336         tdev->ctl = cxgb_offload_ctl;
1337         tdev->type = adap2type(adapter);
1338
1339         register_tdev(tdev);
1340 }
1341
1342 void __devexit cxgb3_adapter_unofld(struct adapter *adapter)
1343 {
1344         struct t3cdev *tdev = &adapter->tdev;
1345
1346         tdev->recv = NULL;
1347         tdev->neigh_update = NULL;
1348
1349         unregister_tdev(tdev);
1350 }
1351
1352 void __init cxgb3_offload_init(void)
1353 {
1354         int i;
1355
1356         for (i = 0; i < NUM_CPL_CMDS; ++i)
1357                 cpl_handlers[i] = do_bad_cpl;
1358
1359         t3_register_cpl_handler(CPL_SMT_WRITE_RPL, do_smt_write_rpl);
1360         t3_register_cpl_handler(CPL_L2T_WRITE_RPL, do_l2t_write_rpl);
1361         t3_register_cpl_handler(CPL_RTE_WRITE_RPL, do_rte_write_rpl);
1362         t3_register_cpl_handler(CPL_PASS_OPEN_RPL, do_stid_rpl);
1363         t3_register_cpl_handler(CPL_CLOSE_LISTSRV_RPL, do_stid_rpl);
1364         t3_register_cpl_handler(CPL_PASS_ACCEPT_REQ, do_cr);
1365         t3_register_cpl_handler(CPL_PASS_ESTABLISH, do_hwtid_rpl);
1366         t3_register_cpl_handler(CPL_ABORT_RPL_RSS, do_hwtid_rpl);
1367         t3_register_cpl_handler(CPL_ABORT_RPL, do_hwtid_rpl);
1368         t3_register_cpl_handler(CPL_RX_URG_NOTIFY, do_hwtid_rpl);
1369         t3_register_cpl_handler(CPL_RX_DATA, do_hwtid_rpl);
1370         t3_register_cpl_handler(CPL_TX_DATA_ACK, do_hwtid_rpl);
1371         t3_register_cpl_handler(CPL_TX_DMA_ACK, do_hwtid_rpl);
1372         t3_register_cpl_handler(CPL_ACT_OPEN_RPL, do_act_open_rpl);
1373         t3_register_cpl_handler(CPL_PEER_CLOSE, do_hwtid_rpl);
1374         t3_register_cpl_handler(CPL_CLOSE_CON_RPL, do_hwtid_rpl);
1375         t3_register_cpl_handler(CPL_ABORT_REQ_RSS, do_abort_req_rss);
1376         t3_register_cpl_handler(CPL_ACT_ESTABLISH, do_act_establish);
1377         t3_register_cpl_handler(CPL_SET_TCB_RPL, do_hwtid_rpl);
1378         t3_register_cpl_handler(CPL_GET_TCB_RPL, do_hwtid_rpl);
1379         t3_register_cpl_handler(CPL_RDMA_TERMINATE, do_term);
1380         t3_register_cpl_handler(CPL_RDMA_EC_STATUS, do_hwtid_rpl);
1381         t3_register_cpl_handler(CPL_TRACE_PKT, do_trace);
1382         t3_register_cpl_handler(CPL_RX_DATA_DDP, do_hwtid_rpl);
1383         t3_register_cpl_handler(CPL_RX_DDP_COMPLETE, do_hwtid_rpl);
1384         t3_register_cpl_handler(CPL_ISCSI_HDR, do_hwtid_rpl);
1385 }