drivers/net/ethernet/chelsio/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 <linux/slab.h>
  35 #include <net/neighbour.h>
  36 #include <linux/notifier.h>
  37 #include <linux/atomic.h>
  38 #include <linux/proc_fs.h>
  39 #include <linux/if_vlan.h>
  40 #include <net/netevent.h>
  41 #include <linux/highmem.h>
  42 #include <linux/vmalloc.h>
  43 #include <linux/export.h>
  44
  45 #include "common.h"
  46 #include "regs.h"
  47 #include "cxgb3_ioctl.h"
  48 #include "cxgb3_ctl_defs.h"
  49 #include "cxgb3_defs.h"
  50 #include "l2t.h"
  51 #include "firmware_exports.h"
  52 #include "cxgb3_offload.h"
  53
  54 static LIST_HEAD(client_list);
  55 static LIST_HEAD(ofld_dev_list);
  56 static DEFINE_MUTEX(cxgb3_db_lock);
  57
  58 static DEFINE_RWLOCK(adapter_list_lock);
  59 static LIST_HEAD(adapter_list);
  60
  61 static const unsigned int MAX_ATIDS = 64 * 1024;
  62 static const unsigned int ATID_BASE = 0x10000;
  63
  64 static void cxgb_neigh_update(struct neighbour *neigh);
  65 static void cxgb_redirect(struct dst_entry *old, struct neighbour *old_neigh,
  66                           struct dst_entry *new, struct neighbour *new_neigh,
  67                           const void *daddr);
  68
  69 static inline int offload_activated(struct t3cdev *tdev)
  70 {
  71         const struct adapter *adapter = tdev2adap(tdev);
  72
  73         return test_bit(OFFLOAD_DEVMAP_BIT, &adapter->open_device_map);
  74 }
  75
  76 /**
  77  *      cxgb3_register_client - register an offload client
  78  *      @client: the client
  79  *
  80  *      Add the client to the client list,
  81  *      and call backs the client for each activated offload device
  82  */
  83 void cxgb3_register_client(struct cxgb3_client *client)
  84 {
  85         struct t3cdev *tdev;
  86
  87         mutex_lock(&cxgb3_db_lock);
  88         list_add_tail(&client->client_list, &client_list);
  89
  90         if (client->add) {
  91                 list_for_each_entry(tdev, &ofld_dev_list, ofld_dev_list) {
  92                         if (offload_activated(tdev))
  93                                 client->add(tdev);
  94                 }
  95         }
  96         mutex_unlock(&cxgb3_db_lock);
  97 }
  98
  99 EXPORT_SYMBOL(cxgb3_register_client);
 100
 101 /**
 102  *      cxgb3_unregister_client - unregister an offload client
 103  *      @client: the client
 104  *
 105  *      Remove the client to the client list,
 106  *      and call backs the client for each activated offload device.
 107  */
 108 void cxgb3_unregister_client(struct cxgb3_client *client)
 109 {
 110         struct t3cdev *tdev;
 111
 112         mutex_lock(&cxgb3_db_lock);
 113         list_del(&client->client_list);
 114
 115         if (client->remove) {
 116                 list_for_each_entry(tdev, &ofld_dev_list, ofld_dev_list) {
 117                         if (offload_activated(tdev))
 118                                 client->remove(tdev);
 119                 }
 120         }
 121         mutex_unlock(&cxgb3_db_lock);
 122 }
 123
 124 EXPORT_SYMBOL(cxgb3_unregister_client);
 125
 126 /**
 127  *      cxgb3_add_clients - activate registered clients for an offload device
 128  *      @tdev: the offload device
 129  *
 130  *      Call backs all registered clients once a offload device is activated
 131  */
 132 void cxgb3_add_clients(struct t3cdev *tdev)
 133 {
 134         struct cxgb3_client *client;
 135
 136         mutex_lock(&cxgb3_db_lock);
 137         list_for_each_entry(client, &client_list, client_list) {
 138                 if (client->add)
 139                         client->add(tdev);
 140         }
 141         mutex_unlock(&cxgb3_db_lock);
 142 }
 143
 144 /**
 145  *      cxgb3_remove_clients - deactivates registered clients
 146  *                             for an offload device
 147  *      @tdev: the offload device
 148  *
 149  *      Call backs all registered clients once a offload device is deactivated
 150  */
 151 void cxgb3_remove_clients(struct t3cdev *tdev)
 152 {
 153         struct cxgb3_client *client;
 154
 155         mutex_lock(&cxgb3_db_lock);
 156         list_for_each_entry(client, &client_list, client_list) {
 157                 if (client->remove)
 158                         client->remove(tdev);
 159         }
 160         mutex_unlock(&cxgb3_db_lock);
 161 }
 162
 163 void cxgb3_event_notify(struct t3cdev *tdev, u32 event, u32 port)
 164 {
 165         struct cxgb3_client *client;
 166
 167         mutex_lock(&cxgb3_db_lock);
 168         list_for_each_entry(client, &client_list, client_list) {
 169                 if (client->event_handler)
 170                         client->event_handler(tdev, event, port);
 171         }
 172         mutex_unlock(&cxgb3_db_lock);
 173 }
 174
 175 static struct net_device *get_iff_from_mac(struct adapter *adapter,
 176                                            const unsigned char *mac,
 177                                            unsigned int vlan)
 178 {
 179         int i;
 180
 181         for_each_port(adapter, i) {
 182                 struct net_device *dev = adapter->port[i];
 183
 184                 if (!memcmp(dev->dev_addr, mac, ETH_ALEN)) {
 185                         if (vlan && vlan != VLAN_VID_MASK) {
 186                                 rcu_read_lock();
 187                                 dev = __vlan_find_dev_deep(dev, vlan);
 188                                 rcu_read_unlock();
 189                         } else if (netif_is_bond_slave(dev)) {
 190                                 while (dev->master)
 191                                         dev = dev->master;
 192                         }
 193                         return dev;
 194                 }
 195         }
 196         return NULL;
 197 }
 198
 199 static int cxgb_ulp_iscsi_ctl(struct adapter *adapter, unsigned int req,
 200                               void *data)
 201 {
 202         int i;
 203         int ret = 0;
 204         unsigned int val = 0;
 205         struct ulp_iscsi_info *uiip = data;
 206
 207         switch (req) {
 208         case ULP_ISCSI_GET_PARAMS:
 209                 uiip->pdev = adapter->pdev;
 210                 uiip->llimit = t3_read_reg(adapter, A_ULPRX_ISCSI_LLIMIT);
 211                 uiip->ulimit = t3_read_reg(adapter, A_ULPRX_ISCSI_ULIMIT);
 212                 uiip->tagmask = t3_read_reg(adapter, A_ULPRX_ISCSI_TAGMASK);
 213
 214                 val = t3_read_reg(adapter, A_ULPRX_ISCSI_PSZ);
 215                 for (i = 0; i < 4; i++, val >>= 8)
 216                         uiip->pgsz_factor[i] = val & 0xFF;
 217
 218                 val = t3_read_reg(adapter, A_TP_PARA_REG7);
 219                 uiip->max_txsz =
 220                 uiip->max_rxsz = min((val >> S_PMMAXXFERLEN0)&M_PMMAXXFERLEN0,
 221                                      (val >> S_PMMAXXFERLEN1)&M_PMMAXXFERLEN1);
 222                 /*
 223                  * On tx, the iscsi pdu has to be <= tx page size and has to
 224                  * fit into the Tx PM FIFO.
 225                  */
 226                 val = min(adapter->params.tp.tx_pg_size,
 227                           t3_read_reg(adapter, A_PM1_TX_CFG) >> 17);
 228                 uiip->max_txsz = min(val, uiip->max_txsz);
 229
 230                 /* set MaxRxData to 16224 */
 231                 val = t3_read_reg(adapter, A_TP_PARA_REG2);
 232                 if ((val >> S_MAXRXDATA) != 0x3f60) {
 233                         val &= (M_RXCOALESCESIZE << S_RXCOALESCESIZE);
 234                         val |= V_MAXRXDATA(0x3f60);
 235                         printk(KERN_INFO
 236                                 "%s, iscsi set MaxRxData to 16224 (0x%x).\n",
 237                                 adapter->name, val);
 238                         t3_write_reg(adapter, A_TP_PARA_REG2, val);
 239                 }
 240
 241                 /*
 242                  * on rx, the iscsi pdu has to be < rx page size and the
 243                  * the max rx data length programmed in TP
 244                  */
 245                 val = min(adapter->params.tp.rx_pg_size,
 246                           ((t3_read_reg(adapter, A_TP_PARA_REG2)) >>
 247                                 S_MAXRXDATA) & M_MAXRXDATA);
 248                 uiip->max_rxsz = min(val, uiip->max_rxsz);
 249                 break;
 250         case ULP_ISCSI_SET_PARAMS:
 251                 t3_write_reg(adapter, A_ULPRX_ISCSI_TAGMASK, uiip->tagmask);
 252                 /* program the ddp page sizes */
 253                 for (i = 0; i < 4; i++)
 254                         val |= (uiip->pgsz_factor[i] & 0xF) << (8 * i);
 255                 if (val && (val != t3_read_reg(adapter, A_ULPRX_ISCSI_PSZ))) {
 256                         printk(KERN_INFO
 257                                 "%s, setting iscsi pgsz 0x%x, %u,%u,%u,%u.\n",
 258                                 adapter->name, val, uiip->pgsz_factor[0],
 259                                 uiip->pgsz_factor[1], uiip->pgsz_factor[2],
 260                                 uiip->pgsz_factor[3]);
 261                         t3_write_reg(adapter, A_ULPRX_ISCSI_PSZ, val);
 262                 }
 263                 break;
 264         default:
 265                 ret = -EOPNOTSUPP;
 266         }
 267         return ret;
 268 }
 269
 270 /* Response queue used for RDMA events. */
 271 #define ASYNC_NOTIF_RSPQ 0
 272
 273 static int cxgb_rdma_ctl(struct adapter *adapter, unsigned int req, void *data)
 274 {
 275         int ret = 0;
 276
 277         switch (req) {
 278         case RDMA_GET_PARAMS: {
 279                 struct rdma_info *rdma = data;
 280                 struct pci_dev *pdev = adapter->pdev;
 281
 282                 rdma->udbell_physbase = pci_resource_start(pdev, 2);
 283                 rdma->udbell_len = pci_resource_len(pdev, 2);
 284                 rdma->tpt_base =
 285                         t3_read_reg(adapter, A_ULPTX_TPT_LLIMIT);
 286                 rdma->tpt_top = t3_read_reg(adapter, A_ULPTX_TPT_ULIMIT);
 287                 rdma->pbl_base =
 288                         t3_read_reg(adapter, A_ULPTX_PBL_LLIMIT);
 289                 rdma->pbl_top = t3_read_reg(adapter, A_ULPTX_PBL_ULIMIT);
 290                 rdma->rqt_base = t3_read_reg(adapter, A_ULPRX_RQ_LLIMIT);
 291                 rdma->rqt_top = t3_read_reg(adapter, A_ULPRX_RQ_ULIMIT);
 292                 rdma->kdb_addr = adapter->regs + A_SG_KDOORBELL;
 293                 rdma->pdev = pdev;
 294                 break;
 295         }
 296         case RDMA_CQ_OP:{
 297                 unsigned long flags;
 298                 struct rdma_cq_op *rdma = data;
 299
 300                 /* may be called in any context */
 301                 spin_lock_irqsave(&adapter->sge.reg_lock, flags);
 302                 ret = t3_sge_cqcntxt_op(adapter, rdma->id, rdma->op,
 303                                         rdma->credits);
 304                 spin_unlock_irqrestore(&adapter->sge.reg_lock, flags);
 305                 break;
 306         }
 307         case RDMA_GET_MEM:{
 308                 struct ch_mem_range *t = data;
 309                 struct mc7 *mem;
 310
 311                 if ((t->addr & 7) || (t->len & 7))
 312                         return -EINVAL;
 313                 if (t->mem_id == MEM_CM)
 314                         mem = &adapter->cm;
 315                 else if (t->mem_id == MEM_PMRX)
 316                         mem = &adapter->pmrx;
 317                 else if (t->mem_id == MEM_PMTX)
 318                         mem = &adapter->pmtx;
 319                 else
 320                         return -EINVAL;
 321
 322                 ret =
 323                         t3_mc7_bd_read(mem, t->addr / 8, t->len / 8,
 324                                         (u64 *) t->buf);
 325                 if (ret)
 326                         return ret;
 327                 break;
 328         }
 329         case RDMA_CQ_SETUP:{
 330                 struct rdma_cq_setup *rdma = data;
 331
 332                 spin_lock_irq(&adapter->sge.reg_lock);
 333                 ret =
 334                         t3_sge_init_cqcntxt(adapter, rdma->id,
 335                                         rdma->base_addr, rdma->size,
 336                                         ASYNC_NOTIF_RSPQ,
 337                                         rdma->ovfl_mode, rdma->credits,
 338                                         rdma->credit_thres);
 339                 spin_unlock_irq(&adapter->sge.reg_lock);
 340                 break;
 341         }
 342         case RDMA_CQ_DISABLE:
 343                 spin_lock_irq(&adapter->sge.reg_lock);
 344                 ret = t3_sge_disable_cqcntxt(adapter, *(unsigned int *)data);
 345                 spin_unlock_irq(&adapter->sge.reg_lock);
 346                 break;
 347         case RDMA_CTRL_QP_SETUP:{
 348                 struct rdma_ctrlqp_setup *rdma = data;
 349
 350                 spin_lock_irq(&adapter->sge.reg_lock);
 351                 ret = t3_sge_init_ecntxt(adapter, FW_RI_SGEEC_START, 0,
 352                                                 SGE_CNTXT_RDMA,
 353                                                 ASYNC_NOTIF_RSPQ,
 354                                                 rdma->base_addr, rdma->size,
 355                                                 FW_RI_TID_START, 1, 0);
 356                 spin_unlock_irq(&adapter->sge.reg_lock);
 357                 break;
 358         }
 359         case RDMA_GET_MIB: {
 360                 spin_lock(&adapter->stats_lock);
 361                 t3_tp_get_mib_stats(adapter, (struct tp_mib_stats *)data);
 362                 spin_unlock(&adapter->stats_lock);
 363                 break;
 364         }
 365         default:
 366                 ret = -EOPNOTSUPP;
 367         }
 368         return ret;
 369 }
 370
 371 static int cxgb_offload_ctl(struct t3cdev *tdev, unsigned int req, void *data)
 372 {
 373         struct adapter *adapter = tdev2adap(tdev);
 374         struct tid_range *tid;
 375         struct mtutab *mtup;
 376         struct iff_mac *iffmacp;
 377         struct ddp_params *ddpp;
 378         struct adap_ports *ports;
 379         struct ofld_page_info *rx_page_info;
 380         struct tp_params *tp = &adapter->params.tp;
 381         int i;
 382
 383         switch (req) {
 384         case GET_MAX_OUTSTANDING_WR:
 385                 *(unsigned int *)data = FW_WR_NUM;
 386                 break;
 387         case GET_WR_LEN:
 388                 *(unsigned int *)data = WR_FLITS;
 389                 break;
 390         case GET_TX_MAX_CHUNK:
 391                 *(unsigned int *)data = 1 << 20;        /* 1MB */
 392                 break;
 393         case GET_TID_RANGE:
 394                 tid = data;
 395                 tid->num = t3_mc5_size(&adapter->mc5) -
 396                     adapter->params.mc5.nroutes -
 397                     adapter->params.mc5.nfilters - adapter->params.mc5.nservers;
 398                 tid->base = 0;
 399                 break;
 400         case GET_STID_RANGE:
 401                 tid = data;
 402                 tid->num = adapter->params.mc5.nservers;
 403                 tid->base = t3_mc5_size(&adapter->mc5) - tid->num -
 404                     adapter->params.mc5.nfilters - adapter->params.mc5.nroutes;
 405                 break;
 406         case GET_L2T_CAPACITY:
 407                 *(unsigned int *)data = 2048;
 408                 break;
 409         case GET_MTUS:
 410                 mtup = data;
 411                 mtup->size = NMTUS;
 412                 mtup->mtus = adapter->params.mtus;
 413                 break;
 414         case GET_IFF_FROM_MAC:
 415                 iffmacp = data;
 416                 iffmacp->dev = get_iff_from_mac(adapter, iffmacp->mac_addr,
 417                                                 iffmacp->vlan_tag &
 418                                                 VLAN_VID_MASK);
 419                 break;
 420         case GET_DDP_PARAMS:
 421                 ddpp = data;
 422                 ddpp->llimit = t3_read_reg(adapter, A_ULPRX_TDDP_LLIMIT);
 423                 ddpp->ulimit = t3_read_reg(adapter, A_ULPRX_TDDP_ULIMIT);
 424                 ddpp->tag_mask = t3_read_reg(adapter, A_ULPRX_TDDP_TAGMASK);
 425                 break;
 426         case GET_PORTS:
 427                 ports = data;
 428                 ports->nports = adapter->params.nports;
 429                 for_each_port(adapter, i)
 430                         ports->lldevs[i] = adapter->port[i];
 431                 break;
 432         case ULP_ISCSI_GET_PARAMS:
 433         case ULP_ISCSI_SET_PARAMS:
 434                 if (!offload_running(adapter))
 435                         return -EAGAIN;
 436                 return cxgb_ulp_iscsi_ctl(adapter, req, data);
 437         case RDMA_GET_PARAMS:
 438         case RDMA_CQ_OP:
 439         case RDMA_CQ_SETUP:
 440         case RDMA_CQ_DISABLE:
 441         case RDMA_CTRL_QP_SETUP:
 442         case RDMA_GET_MEM:
 443         case RDMA_GET_MIB:
 444                 if (!offload_running(adapter))
 445                         return -EAGAIN;
 446                 return cxgb_rdma_ctl(adapter, req, data);
 447         case GET_RX_PAGE_INFO:
 448                 rx_page_info = data;
 449                 rx_page_info->page_size = tp->rx_pg_size;
 450                 rx_page_info->num = tp->rx_num_pgs;
 451                 break;
 452         case GET_ISCSI_IPV4ADDR: {
 453                 struct iscsi_ipv4addr *p = data;
 454                 struct port_info *pi = netdev_priv(p->dev);
 455                 p->ipv4addr = pi->iscsi_ipv4addr;
 456                 break;
 457         }
 458         case GET_EMBEDDED_INFO: {
 459                 struct ch_embedded_info *e = data;
 460
 461                 spin_lock(&adapter->stats_lock);
 462                 t3_get_fw_version(adapter, &e->fw_vers);
 463                 t3_get_tp_version(adapter, &e->tp_vers);
 464                 spin_unlock(&adapter->stats_lock);
 465                 break;
 466         }
 467         default:
 468                 return -EOPNOTSUPP;
 469         }
 470         return 0;
 471 }
 472
 473 /*
 474  * Dummy handler for Rx offload packets in case we get an offload packet before
 475  * proper processing is setup.  This complains and drops the packet as it isn't
 476  * normal to get offload packets at this stage.
 477  */
 478 static int rx_offload_blackhole(struct t3cdev *dev, struct sk_buff **skbs,
 479                                 int n)
 480 {
 481         while (n--)
 482                 dev_kfree_skb_any(skbs[n]);
 483         return 0;
 484 }
 485
 486 static void dummy_neigh_update(struct t3cdev *dev, struct neighbour *neigh)
 487 {
 488 }
 489
 490 void cxgb3_set_dummy_ops(struct t3cdev *dev)
 491 {
 492         dev->recv = rx_offload_blackhole;
 493         dev->neigh_update = dummy_neigh_update;
 494 }
 495
 496 /*
 497  * Free an active-open TID.
 498  */
 499 void *cxgb3_free_atid(struct t3cdev *tdev, int atid)
 500 {
 501         struct tid_info *t = &(T3C_DATA(tdev))->tid_maps;
 502         union active_open_entry *p = atid2entry(t, atid);
 503         void *ctx = p->t3c_tid.ctx;
 504
 505         spin_lock_bh(&t->atid_lock);
 506         p->next = t->afree;
 507         t->afree = p;
 508         t->atids_in_use--;
 509         spin_unlock_bh(&t->atid_lock);
 510
 511         return ctx;
 512 }
 513
 514 EXPORT_SYMBOL(cxgb3_free_atid);
 515
 516 /*
 517  * Free a server TID and return it to the free pool.
 518  */
 519 void cxgb3_free_stid(struct t3cdev *tdev, int stid)
 520 {
 521         struct tid_info *t = &(T3C_DATA(tdev))->tid_maps;
 522         union listen_entry *p = stid2entry(t, stid);
 523
 524         spin_lock_bh(&t->stid_lock);
 525         p->next = t->sfree;
 526         t->sfree = p;
 527         t->stids_in_use--;
 528         spin_unlock_bh(&t->stid_lock);
 529 }
 530
 531 EXPORT_SYMBOL(cxgb3_free_stid);
 532
 533 void cxgb3_insert_tid(struct t3cdev *tdev, struct cxgb3_client *client,
 534                       void *ctx, unsigned int tid)
 535 {
 536         struct tid_info *t = &(T3C_DATA(tdev))->tid_maps;
 537
 538         t->tid_tab[tid].client = client;
 539         t->tid_tab[tid].ctx = ctx;
 540         atomic_inc(&t->tids_in_use);
 541 }
 542
 543 EXPORT_SYMBOL(cxgb3_insert_tid);
 544
 545 /*
 546  * Populate a TID_RELEASE WR.  The skb must be already propely sized.
 547  */
 548 static inline void mk_tid_release(struct sk_buff *skb, unsigned int tid)
 549 {
 550         struct cpl_tid_release *req;
 551
 552         skb->priority = CPL_PRIORITY_SETUP;
 553         req = (struct cpl_tid_release *)__skb_put(skb, sizeof(*req));
 554         req->wr.wr_hi = htonl(V_WR_OP(FW_WROPCODE_FORWARD));
 555         OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_TID_RELEASE, tid));
 556 }
 557
 558 static void t3_process_tid_release_list(struct work_struct *work)
 559 {
 560         struct t3c_data *td = container_of(work, struct t3c_data,
 561                                            tid_release_task);
 562         struct sk_buff *skb;
 563         struct t3cdev *tdev = td->dev;
 564
 565
 566         spin_lock_bh(&td->tid_release_lock);
 567         while (td->tid_release_list) {
 568                 struct t3c_tid_entry *p = td->tid_release_list;
 569
 570                 td->tid_release_list = p->ctx;
 571                 spin_unlock_bh(&td->tid_release_lock);
 572
 573                 skb = alloc_skb(sizeof(struct cpl_tid_release),
 574                                 GFP_KERNEL);
 575                 if (!skb)
 576                         skb = td->nofail_skb;
 577                 if (!skb) {
 578                         spin_lock_bh(&td->tid_release_lock);
 579                         p->ctx = (void *)td->tid_release_list;
 580                         td->tid_release_list = p;
 581                         break;
 582                 }
 583                 mk_tid_release(skb, p - td->tid_maps.tid_tab);
 584                 cxgb3_ofld_send(tdev, skb);
 585                 p->ctx = NULL;
 586                 if (skb == td->nofail_skb)
 587                         td->nofail_skb =
 588                                 alloc_skb(sizeof(struct cpl_tid_release),
 589                                         GFP_KERNEL);
 590                 spin_lock_bh(&td->tid_release_lock);
 591         }
 592         td->release_list_incomplete = (td->tid_release_list == NULL) ? 0 : 1;
 593         spin_unlock_bh(&td->tid_release_lock);
 594
 595         if (!td->nofail_skb)
 596                 td->nofail_skb =
 597                         alloc_skb(sizeof(struct cpl_tid_release),
 598                                 GFP_KERNEL);
 599 }
 600
 601 /* use ctx as a next pointer in the tid release list */
 602 void cxgb3_queue_tid_release(struct t3cdev *tdev, unsigned int tid)
 603 {
 604         struct t3c_data *td = T3C_DATA(tdev);
 605         struct t3c_tid_entry *p = &td->tid_maps.tid_tab[tid];
 606
 607         spin_lock_bh(&td->tid_release_lock);
 608         p->ctx = (void *)td->tid_release_list;
 609         p->client = NULL;
 610         td->tid_release_list = p;
 611         if (!p->ctx || td->release_list_incomplete)
 612                 schedule_work(&td->tid_release_task);
 613         spin_unlock_bh(&td->tid_release_lock);
 614 }
 615
 616 EXPORT_SYMBOL(cxgb3_queue_tid_release);
 617
 618 /*
 619  * Remove a tid from the TID table.  A client may defer processing its last
 620  * CPL message if it is locked at the time it arrives, and while the message
 621  * sits in the client's backlog the TID may be reused for another connection.
 622  * To handle this we atomically switch the TID association if it still points
 623  * to the original client context.
 624  */
 625 void cxgb3_remove_tid(struct t3cdev *tdev, void *ctx, unsigned int tid)
 626 {
 627         struct tid_info *t = &(T3C_DATA(tdev))->tid_maps;
 628
 629         BUG_ON(tid >= t->ntids);
 630         if (tdev->type == T3A)
 631                 (void)cmpxchg(&t->tid_tab[tid].ctx, ctx, NULL);
 632         else {
 633                 struct sk_buff *skb;
 634
 635                 skb = alloc_skb(sizeof(struct cpl_tid_release), GFP_ATOMIC);
 636                 if (likely(skb)) {
 637                         mk_tid_release(skb, tid);
 638                         cxgb3_ofld_send(tdev, skb);
 639                         t->tid_tab[tid].ctx = NULL;
 640                 } else
 641                         cxgb3_queue_tid_release(tdev, tid);
 642         }
 643         atomic_dec(&t->tids_in_use);
 644 }
 645
 646 EXPORT_SYMBOL(cxgb3_remove_tid);
 647
 648 int cxgb3_alloc_atid(struct t3cdev *tdev, struct cxgb3_client *client,
 649                      void *ctx)
 650 {
 651         int atid = -1;
 652         struct tid_info *t = &(T3C_DATA(tdev))->tid_maps;
 653
 654         spin_lock_bh(&t->atid_lock);
 655         if (t->afree &&
 656             t->atids_in_use + atomic_read(&t->tids_in_use) + MC5_MIN_TIDS <=
 657             t->ntids) {
 658                 union active_open_entry *p = t->afree;
 659
 660                 atid = (p - t->atid_tab) + t->atid_base;
 661                 t->afree = p->next;
 662                 p->t3c_tid.ctx = ctx;
 663                 p->t3c_tid.client = client;
 664                 t->atids_in_use++;
 665         }
 666         spin_unlock_bh(&t->atid_lock);
 667         return atid;
 668 }
 669
 670 EXPORT_SYMBOL(cxgb3_alloc_atid);
 671
 672 int cxgb3_alloc_stid(struct t3cdev *tdev, struct cxgb3_client *client,
 673                      void *ctx)
 674 {
 675         int stid = -1;
 676         struct tid_info *t = &(T3C_DATA(tdev))->tid_maps;
 677
 678         spin_lock_bh(&t->stid_lock);
 679         if (t->sfree) {
 680                 union listen_entry *p = t->sfree;
 681
 682                 stid = (p - t->stid_tab) + t->stid_base;
 683                 t->sfree = p->next;
 684                 p->t3c_tid.ctx = ctx;
 685                 p->t3c_tid.client = client;
 686                 t->stids_in_use++;
 687         }
 688         spin_unlock_bh(&t->stid_lock);
 689         return stid;
 690 }
 691
 692 EXPORT_SYMBOL(cxgb3_alloc_stid);
 693
 694 /* Get the t3cdev associated with a net_device */
 695 struct t3cdev *dev2t3cdev(struct net_device *dev)
 696 {
 697         const struct port_info *pi = netdev_priv(dev);
 698
 699         return (struct t3cdev *)pi->adapter;
 700 }
 701
 702 EXPORT_SYMBOL(dev2t3cdev);
 703
 704 static int do_smt_write_rpl(struct t3cdev *dev, struct sk_buff *skb)
 705 {
 706         struct cpl_smt_write_rpl *rpl = cplhdr(skb);
 707
 708         if (rpl->status != CPL_ERR_NONE)
 709                 printk(KERN_ERR
 710                        "Unexpected SMT_WRITE_RPL status %u for entry %u\n",
 711                        rpl->status, GET_TID(rpl));
 712
 713         return CPL_RET_BUF_DONE;
 714 }
 715
 716 static int do_l2t_write_rpl(struct t3cdev *dev, struct sk_buff *skb)
 717 {
 718         struct cpl_l2t_write_rpl *rpl = cplhdr(skb);
 719
 720         if (rpl->status != CPL_ERR_NONE)
 721                 printk(KERN_ERR
 722                        "Unexpected L2T_WRITE_RPL status %u for entry %u\n",
 723                        rpl->status, GET_TID(rpl));
 724
 725         return CPL_RET_BUF_DONE;
 726 }
 727
 728 static int do_rte_write_rpl(struct t3cdev *dev, struct sk_buff *skb)
 729 {
 730         struct cpl_rte_write_rpl *rpl = cplhdr(skb);
 731
 732         if (rpl->status != CPL_ERR_NONE)
 733                 printk(KERN_ERR
 734                        "Unexpected RTE_WRITE_RPL status %u for entry %u\n",
 735                        rpl->status, GET_TID(rpl));
 736
 737         return CPL_RET_BUF_DONE;
 738 }
 739
 740 static int do_act_open_rpl(struct t3cdev *dev, struct sk_buff *skb)
 741 {
 742         struct cpl_act_open_rpl *rpl = cplhdr(skb);
 743         unsigned int atid = G_TID(ntohl(rpl->atid));
 744         struct t3c_tid_entry *t3c_tid;
 745
 746         t3c_tid = lookup_atid(&(T3C_DATA(dev))->tid_maps, atid);
 747         if (t3c_tid && t3c_tid->ctx && t3c_tid->client &&
 748             t3c_tid->client->handlers &&
 749             t3c_tid->client->handlers[CPL_ACT_OPEN_RPL]) {
 750                 return t3c_tid->client->handlers[CPL_ACT_OPEN_RPL] (dev, skb,
 751                                                                     t3c_tid->
 752                                                                     ctx);
 753         } else {
 754                 printk(KERN_ERR "%s: received clientless CPL command 0x%x\n",
 755                        dev->name, CPL_ACT_OPEN_RPL);
 756                 return CPL_RET_BUF_DONE | CPL_RET_BAD_MSG;
 757         }
 758 }
 759
 760 static int do_stid_rpl(struct t3cdev *dev, struct sk_buff *skb)
 761 {
 762         union opcode_tid *p = cplhdr(skb);
 763         unsigned int stid = G_TID(ntohl(p->opcode_tid));
 764         struct t3c_tid_entry *t3c_tid;
 765
 766         t3c_tid = lookup_stid(&(T3C_DATA(dev))->tid_maps, stid);
 767         if (t3c_tid && t3c_tid->ctx && t3c_tid->client->handlers &&
 768             t3c_tid->client->handlers[p->opcode]) {
 769                 return t3c_tid->client->handlers[p->opcode] (dev, skb,
 770                                                              t3c_tid->ctx);
 771         } else {
 772                 printk(KERN_ERR "%s: received clientless CPL command 0x%x\n",
 773                        dev->name, p->opcode);
 774                 return CPL_RET_BUF_DONE | CPL_RET_BAD_MSG;
 775         }
 776 }
 777
 778 static int do_hwtid_rpl(struct t3cdev *dev, struct sk_buff *skb)
 779 {
 780         union opcode_tid *p = cplhdr(skb);
 781         unsigned int hwtid = G_TID(ntohl(p->opcode_tid));
 782         struct t3c_tid_entry *t3c_tid;
 783
 784         t3c_tid = lookup_tid(&(T3C_DATA(dev))->tid_maps, hwtid);
 785         if (t3c_tid && t3c_tid->ctx && t3c_tid->client->handlers &&
 786             t3c_tid->client->handlers[p->opcode]) {
 787                 return t3c_tid->client->handlers[p->opcode]
 788                     (dev, skb, t3c_tid->ctx);
 789         } else {
 790                 printk(KERN_ERR "%s: received clientless CPL command 0x%x\n",
 791                        dev->name, p->opcode);
 792                 return CPL_RET_BUF_DONE | CPL_RET_BAD_MSG;
 793         }
 794 }
 795
 796 static int do_cr(struct t3cdev *dev, struct sk_buff *skb)
 797 {
 798         struct cpl_pass_accept_req *req = cplhdr(skb);
 799         unsigned int stid = G_PASS_OPEN_TID(ntohl(req->tos_tid));
 800         struct tid_info *t = &(T3C_DATA(dev))->tid_maps;
 801         struct t3c_tid_entry *t3c_tid;
 802         unsigned int tid = GET_TID(req);
 803
 804         if (unlikely(tid >= t->ntids)) {
 805                 printk("%s: passive open TID %u too large\n",
 806                        dev->name, tid);
 807                 t3_fatal_err(tdev2adap(dev));
 808                 return CPL_RET_BUF_DONE;
 809         }
 810
 811         t3c_tid = lookup_stid(t, stid);
 812         if (t3c_tid && t3c_tid->ctx && t3c_tid->client->handlers &&
 813             t3c_tid->client->handlers[CPL_PASS_ACCEPT_REQ]) {
 814                 return t3c_tid->client->handlers[CPL_PASS_ACCEPT_REQ]
 815                     (dev, skb, t3c_tid->ctx);
 816         } else {
 817                 printk(KERN_ERR "%s: received clientless CPL command 0x%x\n",
 818                        dev->name, CPL_PASS_ACCEPT_REQ);
 819                 return CPL_RET_BUF_DONE | CPL_RET_BAD_MSG;
 820         }
 821 }
 822
 823 /*
 824  * Returns an sk_buff for a reply CPL message of size len.  If the input
 825  * sk_buff has no other users it is trimmed and reused, otherwise a new buffer
 826  * is allocated.  The input skb must be of size at least len.  Note that this
 827  * operation does not destroy the original skb data even if it decides to reuse
 828  * the buffer.
 829  */
 830 static struct sk_buff *cxgb3_get_cpl_reply_skb(struct sk_buff *skb, size_t len,
 831                                                gfp_t gfp)
 832 {
 833         if (likely(!skb_cloned(skb))) {
 834                 BUG_ON(skb->len < len);
 835                 __skb_trim(skb, len);
 836                 skb_get(skb);
 837         } else {
 838                 skb = alloc_skb(len, gfp);
 839                 if (skb)
 840                         __skb_put(skb, len);
 841         }
 842         return skb;
 843 }
 844
 845 static int do_abort_req_rss(struct t3cdev *dev, struct sk_buff *skb)
 846 {
 847         union opcode_tid *p = cplhdr(skb);
 848         unsigned int hwtid = G_TID(ntohl(p->opcode_tid));
 849         struct t3c_tid_entry *t3c_tid;
 850
 851         t3c_tid = lookup_tid(&(T3C_DATA(dev))->tid_maps, hwtid);
 852         if (t3c_tid && t3c_tid->ctx && t3c_tid->client->handlers &&
 853             t3c_tid->client->handlers[p->opcode]) {
 854                 return t3c_tid->client->handlers[p->opcode]
 855                     (dev, skb, t3c_tid->ctx);
 856         } else {
 857                 struct cpl_abort_req_rss *req = cplhdr(skb);
 858                 struct cpl_abort_rpl *rpl;
 859                 struct sk_buff *reply_skb;
 860                 unsigned int tid = GET_TID(req);
 861                 u8 cmd = req->status;
 862
 863                 if (req->status == CPL_ERR_RTX_NEG_ADVICE ||
 864                     req->status == CPL_ERR_PERSIST_NEG_ADVICE)
 865                         goto out;
 866
 867                 reply_skb = cxgb3_get_cpl_reply_skb(skb,
 868                                                     sizeof(struct
 869                                                            cpl_abort_rpl),
 870                                                     GFP_ATOMIC);
 871
 872                 if (!reply_skb) {
 873                         printk("do_abort_req_rss: couldn't get skb!\n");
 874                         goto out;
 875                 }
 876                 reply_skb->priority = CPL_PRIORITY_DATA;
 877                 __skb_put(reply_skb, sizeof(struct cpl_abort_rpl));
 878                 rpl = cplhdr(reply_skb);
 879                 rpl->wr.wr_hi =
 880                     htonl(V_WR_OP(FW_WROPCODE_OFLD_HOST_ABORT_CON_RPL));
 881                 rpl->wr.wr_lo = htonl(V_WR_TID(tid));
 882                 OPCODE_TID(rpl) = htonl(MK_OPCODE_TID(CPL_ABORT_RPL, tid));
 883                 rpl->cmd = cmd;
 884                 cxgb3_ofld_send(dev, reply_skb);
 885 out:
 886                 return CPL_RET_BUF_DONE;
 887         }
 888 }
 889
 890 static int do_act_establish(struct t3cdev *dev, struct sk_buff *skb)
 891 {
 892         struct cpl_act_establish *req = cplhdr(skb);
 893         unsigned int atid = G_PASS_OPEN_TID(ntohl(req->tos_tid));
 894         struct tid_info *t = &(T3C_DATA(dev))->tid_maps;
 895         struct t3c_tid_entry *t3c_tid;
 896         unsigned int tid = GET_TID(req);
 897
 898         if (unlikely(tid >= t->ntids)) {
 899                 printk("%s: active establish TID %u too large\n",
 900                        dev->name, tid);
 901                 t3_fatal_err(tdev2adap(dev));
 902                 return CPL_RET_BUF_DONE;
 903         }
 904
 905         t3c_tid = lookup_atid(t, atid);
 906         if (t3c_tid && t3c_tid->ctx && t3c_tid->client->handlers &&
 907             t3c_tid->client->handlers[CPL_ACT_ESTABLISH]) {
 908                 return t3c_tid->client->handlers[CPL_ACT_ESTABLISH]
 909                     (dev, skb, t3c_tid->ctx);
 910         } else {
 911                 printk(KERN_ERR "%s: received clientless CPL command 0x%x\n",
 912                        dev->name, CPL_ACT_ESTABLISH);
 913                 return CPL_RET_BUF_DONE | CPL_RET_BAD_MSG;
 914         }
 915 }
 916
 917 static int do_trace(struct t3cdev *dev, struct sk_buff *skb)
 918 {
 919         struct cpl_trace_pkt *p = cplhdr(skb);
 920
 921         skb->protocol = htons(0xffff);
 922         skb->dev = dev->lldev;
 923         skb_pull(skb, sizeof(*p));
 924         skb_reset_mac_header(skb);
 925         netif_receive_skb(skb);
 926         return 0;
 927 }
 928
 929 /*
 930  * That skb would better have come from process_responses() where we abuse
 931  * ->priority and ->csum to carry our data.  NB: if we get to per-arch
 932  * ->csum, the things might get really interesting here.
 933  */
 934
 935 static inline u32 get_hwtid(struct sk_buff *skb)
 936 {
 937         return ntohl((__force __be32)skb->priority) >> 8 & 0xfffff;
 938 }
 939
 940 static inline u32 get_opcode(struct sk_buff *skb)
 941 {
 942         return G_OPCODE(ntohl((__force __be32)skb->csum));
 943 }
 944
 945 static int do_term(struct t3cdev *dev, struct sk_buff *skb)
 946 {
 947         unsigned int hwtid = get_hwtid(skb);
 948         unsigned int opcode = get_opcode(skb);
 949         struct t3c_tid_entry *t3c_tid;
 950
 951         t3c_tid = lookup_tid(&(T3C_DATA(dev))->tid_maps, hwtid);
 952         if (t3c_tid && t3c_tid->ctx && t3c_tid->client->handlers &&
 953             t3c_tid->client->handlers[opcode]) {
 954                 return t3c_tid->client->handlers[opcode] (dev, skb,
 955                                                           t3c_tid->ctx);
 956         } else {
 957                 printk(KERN_ERR "%s: received clientless CPL command 0x%x\n",
 958                        dev->name, opcode);
 959                 return CPL_RET_BUF_DONE | CPL_RET_BAD_MSG;
 960         }
 961 }
 962
 963 static int nb_callback(struct notifier_block *self, unsigned long event,
 964                        void *ctx)
 965 {
 966         switch (event) {
 967         case (NETEVENT_NEIGH_UPDATE):{
 968                 cxgb_neigh_update((struct neighbour *)ctx);
 969                 break;
 970         }
 971         case (NETEVENT_REDIRECT):{
 972                 struct netevent_redirect *nr = ctx;
 973                 cxgb_redirect(nr->old, nr->old_neigh,
 974                               nr->new, nr->new_neigh,
 975                               nr->daddr);
 976                 cxgb_neigh_update(nr->new_neigh);
 977                 break;
 978         }
 979         default:
 980                 break;
 981         }
 982         return 0;
 983 }
 984
 985 static struct notifier_block nb = {
 986         .notifier_call = nb_callback
 987 };
 988
 989 /*
 990  * Process a received packet with an unknown/unexpected CPL opcode.
 991  */
 992 static int do_bad_cpl(struct t3cdev *dev, struct sk_buff *skb)
 993 {
 994         printk(KERN_ERR "%s: received bad CPL command 0x%x\n", dev->name,
 995                *skb->data);
 996         return CPL_RET_BUF_DONE | CPL_RET_BAD_MSG;
 997 }
 998
 999 /*
1000  * Handlers for each CPL opcode
1001  */
1002 static cpl_handler_func cpl_handlers[NUM_CPL_CMDS];
1003
1004 /*
1005  * Add a new handler to the CPL dispatch table.  A NULL handler may be supplied
1006  * to unregister an existing handler.
1007  */
1008 void t3_register_cpl_handler(unsigned int opcode, cpl_handler_func h)
1009 {
1010         if (opcode < NUM_CPL_CMDS)
1011                 cpl_handlers[opcode] = h ? h : do_bad_cpl;
1012         else
1013                 printk(KERN_ERR "T3C: handler registration for "
1014                        "opcode %x failed\n", opcode);
1015 }
1016
1017 EXPORT_SYMBOL(t3_register_cpl_handler);
1018
1019 /*
1020  * T3CDEV's receive method.
1021  */
1022 static int process_rx(struct t3cdev *dev, struct sk_buff **skbs, int n)
1023 {
1024         while (n--) {
1025                 struct sk_buff *skb = *skbs++;
1026                 unsigned int opcode = get_opcode(skb);
1027                 int ret = cpl_handlers[opcode] (dev, skb);
1028
1029 #if VALIDATE_TID
1030                 if (ret & CPL_RET_UNKNOWN_TID) {
1031                         union opcode_tid *p = cplhdr(skb);
1032
1033                         printk(KERN_ERR "%s: CPL message (opcode %u) had "
1034                                "unknown TID %u\n", dev->name, opcode,
1035                                G_TID(ntohl(p->opcode_tid)));
1036                 }
1037 #endif
1038                 if (ret & CPL_RET_BUF_DONE)
1039                         kfree_skb(skb);
1040         }
1041         return 0;
1042 }
1043
1044 /*
1045  * Sends an sk_buff to a T3C driver after dealing with any active network taps.
1046  */
1047 int cxgb3_ofld_send(struct t3cdev *dev, struct sk_buff *skb)
1048 {
1049         int r;
1050
1051         local_bh_disable();
1052         r = dev->send(dev, skb);
1053         local_bh_enable();
1054         return r;
1055 }
1056
1057 EXPORT_SYMBOL(cxgb3_ofld_send);
1058
1059 static int is_offloading(struct net_device *dev)
1060 {
1061         struct adapter *adapter;
1062         int i;
1063
1064         read_lock_bh(&adapter_list_lock);
1065         list_for_each_entry(adapter, &adapter_list, adapter_list) {
1066                 for_each_port(adapter, i) {
1067                         if (dev == adapter->port[i]) {
1068                                 read_unlock_bh(&adapter_list_lock);
1069                                 return 1;
1070                         }
1071                 }
1072         }
1073         read_unlock_bh(&adapter_list_lock);
1074         return 0;
1075 }
1076
1077 static void cxgb_neigh_update(struct neighbour *neigh)
1078 {
1079         struct net_device *dev;
1080
1081         if (!neigh)
1082                 return;
1083         dev = neigh->dev;
1084         if (dev && (is_offloading(dev))) {
1085                 struct t3cdev *tdev = dev2t3cdev(dev);
1086
1087                 BUG_ON(!tdev);
1088                 t3_l2t_update(tdev, neigh);
1089         }
1090 }
1091
1092 static void set_l2t_ix(struct t3cdev *tdev, u32 tid, struct l2t_entry *e)
1093 {
1094         struct sk_buff *skb;
1095         struct cpl_set_tcb_field *req;
1096
1097         skb = alloc_skb(sizeof(*req), GFP_ATOMIC);
1098         if (!skb) {
1099                 printk(KERN_ERR "%s: cannot allocate skb!\n", __func__);
1100                 return;
1101         }
1102         skb->priority = CPL_PRIORITY_CONTROL;
1103         req = (struct cpl_set_tcb_field *)skb_put(skb, sizeof(*req));
1104         req->wr.wr_hi = htonl(V_WR_OP(FW_WROPCODE_FORWARD));
1105         OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_SET_TCB_FIELD, tid));
1106         req->reply = 0;
1107         req->cpu_idx = 0;
1108         req->word = htons(W_TCB_L2T_IX);
1109         req->mask = cpu_to_be64(V_TCB_L2T_IX(M_TCB_L2T_IX));
1110         req->val = cpu_to_be64(V_TCB_L2T_IX(e->idx));
1111         tdev->send(tdev, skb);
1112 }
1113
1114 static void cxgb_redirect(struct dst_entry *old, struct neighbour *old_neigh,
1115                           struct dst_entry *new, struct neighbour *new_neigh,
1116                           const void *daddr)
1117 {
1118         struct net_device *olddev, *newdev;
1119         struct tid_info *ti;
1120         struct t3cdev *tdev;
1121         u32 tid;
1122         int update_tcb;
1123         struct l2t_entry *e;
1124         struct t3c_tid_entry *te;
1125
1126         olddev = old_neigh->dev;
1127         newdev = new_neigh->dev;
1128
1129         if (!is_offloading(olddev))
1130                 return;
1131         if (!is_offloading(newdev)) {
1132                 printk(KERN_WARNING "%s: Redirect to non-offload "
1133                        "device ignored.\n", __func__);
1134                 return;
1135         }
1136         tdev = dev2t3cdev(olddev);
1137         BUG_ON(!tdev);
1138         if (tdev != dev2t3cdev(newdev)) {
1139                 printk(KERN_WARNING "%s: Redirect to different "
1140                        "offload device ignored.\n", __func__);
1141                 return;
1142         }
1143
1144         /* Add new L2T entry */
1145         e = t3_l2t_get(tdev, new, newdev, daddr);
1146         if (!e) {
1147                 printk(KERN_ERR "%s: couldn't allocate new l2t entry!\n",
1148                        __func__);
1149                 return;
1150         }
1151
1152         /* Walk tid table and notify clients of dst change. */
1153         ti = &(T3C_DATA(tdev))->tid_maps;
1154         for (tid = 0; tid < ti->ntids; tid++) {
1155                 te = lookup_tid(ti, tid);
1156                 BUG_ON(!te);
1157                 if (te && te->ctx && te->client && te->client->redirect) {
1158                         update_tcb = te->client->redirect(te->ctx, old, new, e);
1159                         if (update_tcb) {
1160                                 rcu_read_lock();
1161                                 l2t_hold(L2DATA(tdev), e);
1162                                 rcu_read_unlock();
1163                                 set_l2t_ix(tdev, tid, e);
1164                         }
1165                 }
1166         }
1167         l2t_release(tdev, e);
1168 }
1169
1170 /*
1171  * Allocate a chunk of memory using kmalloc or, if that fails, vmalloc.
1172  * The allocated memory is cleared.
1173  */
1174 void *cxgb_alloc_mem(unsigned long size)
1175 {
1176         void *p = kzalloc(size, GFP_KERNEL);
1177
1178         if (!p)
1179                 p = vzalloc(size);
1180         return p;
1181 }
1182
1183 /*
1184  * Free memory allocated through t3_alloc_mem().
1185  */
1186 void cxgb_free_mem(void *addr)
1187 {
1188         if (is_vmalloc_addr(addr))
1189                 vfree(addr);
1190         else
1191                 kfree(addr);
1192 }
1193
1194 /*
1195  * Allocate and initialize the TID tables.  Returns 0 on success.
1196  */
1197 static int init_tid_tabs(struct tid_info *t, unsigned int ntids,
1198                          unsigned int natids, unsigned int nstids,
1199                          unsigned int atid_base, unsigned int stid_base)
1200 {
1201         unsigned long size = ntids * sizeof(*t->tid_tab) +
1202             natids * sizeof(*t->atid_tab) + nstids * sizeof(*t->stid_tab);
1203
1204         t->tid_tab = cxgb_alloc_mem(size);
1205         if (!t->tid_tab)
1206                 return -ENOMEM;
1207
1208         t->stid_tab = (union listen_entry *)&t->tid_tab[ntids];
1209         t->atid_tab = (union active_open_entry *)&t->stid_tab[nstids];
1210         t->ntids = ntids;
1211         t->nstids = nstids;
1212         t->stid_base = stid_base;
1213         t->sfree = NULL;
1214         t->natids = natids;
1215         t->atid_base = atid_base;
1216         t->afree = NULL;
1217         t->stids_in_use = t->atids_in_use = 0;
1218         atomic_set(&t->tids_in_use, 0);
1219         spin_lock_init(&t->stid_lock);
1220         spin_lock_init(&t->atid_lock);
1221
1222         /*
1223          * Setup the free lists for stid_tab and atid_tab.
1224          */
1225         if (nstids) {
1226                 while (--nstids)
1227                         t->stid_tab[nstids - 1].next = &t->stid_tab[nstids];
1228                 t->sfree = t->stid_tab;
1229         }
1230         if (natids) {
1231                 while (--natids)
1232                         t->atid_tab[natids - 1].next = &t->atid_tab[natids];
1233                 t->afree = t->atid_tab;
1234         }
1235         return 0;
1236 }
1237
1238 static void free_tid_maps(struct tid_info *t)
1239 {
1240         cxgb_free_mem(t->tid_tab);
1241 }
1242
1243 static inline void add_adapter(struct adapter *adap)
1244 {
1245         write_lock_bh(&adapter_list_lock);
1246         list_add_tail(&adap->adapter_list, &adapter_list);
1247         write_unlock_bh(&adapter_list_lock);
1248 }
1249
1250 static inline void remove_adapter(struct adapter *adap)
1251 {
1252         write_lock_bh(&adapter_list_lock);
1253         list_del(&adap->adapter_list);
1254         write_unlock_bh(&adapter_list_lock);
1255 }
1256
1257 int cxgb3_offload_activate(struct adapter *adapter)
1258 {
1259         struct t3cdev *dev = &adapter->tdev;
1260         int natids, err;
1261         struct t3c_data *t;
1262         struct tid_range stid_range, tid_range;
1263         struct mtutab mtutab;
1264         unsigned int l2t_capacity;
1265
1266         t = kzalloc(sizeof(*t), GFP_KERNEL);
1267         if (!t)
1268                 return -ENOMEM;
1269
1270         err = -EOPNOTSUPP;
1271         if (dev->ctl(dev, GET_TX_MAX_CHUNK, &t->tx_max_chunk) < 0 ||
1272             dev->ctl(dev, GET_MAX_OUTSTANDING_WR, &t->max_wrs) < 0 ||
1273             dev->ctl(dev, GET_L2T_CAPACITY, &l2t_capacity) < 0 ||
1274             dev->ctl(dev, GET_MTUS, &mtutab) < 0 ||
1275             dev->ctl(dev, GET_TID_RANGE, &tid_range) < 0 ||
1276             dev->ctl(dev, GET_STID_RANGE, &stid_range) < 0)
1277                 goto out_free;
1278
1279         err = -ENOMEM;
1280         RCU_INIT_POINTER(dev->l2opt, t3_init_l2t(l2t_capacity));
1281         if (!L2DATA(dev))
1282                 goto out_free;
1283
1284         natids = min(tid_range.num / 2, MAX_ATIDS);
1285         err = init_tid_tabs(&t->tid_maps, tid_range.num, natids,
1286                             stid_range.num, ATID_BASE, stid_range.base);
1287         if (err)
1288                 goto out_free_l2t;
1289
1290         t->mtus = mtutab.mtus;
1291         t->nmtus = mtutab.size;
1292
1293         INIT_WORK(&t->tid_release_task, t3_process_tid_release_list);
1294         spin_lock_init(&t->tid_release_lock);
1295         INIT_LIST_HEAD(&t->list_node);
1296         t->dev = dev;
1297
1298         T3C_DATA(dev) = t;
1299         dev->recv = process_rx;
1300         dev->neigh_update = t3_l2t_update;
1301
1302         /* Register netevent handler once */
1303         if (list_empty(&adapter_list))
1304                 register_netevent_notifier(&nb);
1305
1306         t->nofail_skb = alloc_skb(sizeof(struct cpl_tid_release), GFP_KERNEL);
1307         t->release_list_incomplete = 0;
1308
1309         add_adapter(adapter);
1310         return 0;
1311
1312 out_free_l2t:
1313         t3_free_l2t(L2DATA(dev));
1314         RCU_INIT_POINTER(dev->l2opt, NULL);
1315 out_free:
1316         kfree(t);
1317         return err;
1318 }
1319
1320 static void clean_l2_data(struct rcu_head *head)
1321 {
1322         struct l2t_data *d = container_of(head, struct l2t_data, rcu_head);
1323         t3_free_l2t(d);
1324 }
1325
1326
1327 void cxgb3_offload_deactivate(struct adapter *adapter)
1328 {
1329         struct t3cdev *tdev = &adapter->tdev;
1330         struct t3c_data *t = T3C_DATA(tdev);
1331         struct l2t_data *d;
1332
1333         remove_adapter(adapter);
1334         if (list_empty(&adapter_list))
1335                 unregister_netevent_notifier(&nb);
1336
1337         free_tid_maps(&t->tid_maps);
1338         T3C_DATA(tdev) = NULL;
1339         rcu_read_lock();
1340         d = L2DATA(tdev);
1341         rcu_read_unlock();
1342         RCU_INIT_POINTER(tdev->l2opt, NULL);
1343         call_rcu(&d->rcu_head, clean_l2_data);
1344         if (t->nofail_skb)
1345                 kfree_skb(t->nofail_skb);
1346         kfree(t);
1347 }
1348
1349 static inline void register_tdev(struct t3cdev *tdev)
1350 {
1351         static int unit;
1352
1353         mutex_lock(&cxgb3_db_lock);
1354         snprintf(tdev->name, sizeof(tdev->name), "ofld_dev%d", unit++);
1355         list_add_tail(&tdev->ofld_dev_list, &ofld_dev_list);
1356         mutex_unlock(&cxgb3_db_lock);
1357 }
1358
1359 static inline void unregister_tdev(struct t3cdev *tdev)
1360 {
1361         mutex_lock(&cxgb3_db_lock);
1362         list_del(&tdev->ofld_dev_list);
1363         mutex_unlock(&cxgb3_db_lock);
1364 }
1365
1366 static inline int adap2type(struct adapter *adapter)
1367 {
1368         int type = 0;
1369
1370         switch (adapter->params.rev) {
1371         case T3_REV_A:
1372                 type = T3A;
1373                 break;
1374         case T3_REV_B:
1375         case T3_REV_B2:
1376                 type = T3B;
1377                 break;
1378         case T3_REV_C:
1379                 type = T3C;
1380                 break;
1381         }
1382         return type;
1383 }
1384
1385 void cxgb3_adapter_ofld(struct adapter *adapter)
1386 {
1387         struct t3cdev *tdev = &adapter->tdev;
1388
1389         INIT_LIST_HEAD(&tdev->ofld_dev_list);
1390
1391         cxgb3_set_dummy_ops(tdev);
1392         tdev->send = t3_offload_tx;
1393         tdev->ctl = cxgb_offload_ctl;
1394         tdev->type = adap2type(adapter);
1395
1396         register_tdev(tdev);
1397 }
1398
1399 void cxgb3_adapter_unofld(struct adapter *adapter)
1400 {
1401         struct t3cdev *tdev = &adapter->tdev;
1402
1403         tdev->recv = NULL;
1404         tdev->neigh_update = NULL;
1405
1406         unregister_tdev(tdev);
1407 }
1408
1409 void __init cxgb3_offload_init(void)
1410 {
1411         int i;
1412
1413         for (i = 0; i < NUM_CPL_CMDS; ++i)
1414                 cpl_handlers[i] = do_bad_cpl;
1415
1416         t3_register_cpl_handler(CPL_SMT_WRITE_RPL, do_smt_write_rpl);
1417         t3_register_cpl_handler(CPL_L2T_WRITE_RPL, do_l2t_write_rpl);
1418         t3_register_cpl_handler(CPL_RTE_WRITE_RPL, do_rte_write_rpl);
1419         t3_register_cpl_handler(CPL_PASS_OPEN_RPL, do_stid_rpl);
1420         t3_register_cpl_handler(CPL_CLOSE_LISTSRV_RPL, do_stid_rpl);
1421         t3_register_cpl_handler(CPL_PASS_ACCEPT_REQ, do_cr);
1422         t3_register_cpl_handler(CPL_PASS_ESTABLISH, do_hwtid_rpl);
1423         t3_register_cpl_handler(CPL_ABORT_RPL_RSS, do_hwtid_rpl);
1424         t3_register_cpl_handler(CPL_ABORT_RPL, do_hwtid_rpl);
1425         t3_register_cpl_handler(CPL_RX_URG_NOTIFY, do_hwtid_rpl);
1426         t3_register_cpl_handler(CPL_RX_DATA, do_hwtid_rpl);
1427         t3_register_cpl_handler(CPL_TX_DATA_ACK, do_hwtid_rpl);
1428         t3_register_cpl_handler(CPL_TX_DMA_ACK, do_hwtid_rpl);
1429         t3_register_cpl_handler(CPL_ACT_OPEN_RPL, do_act_open_rpl);
1430         t3_register_cpl_handler(CPL_PEER_CLOSE, do_hwtid_rpl);
1431         t3_register_cpl_handler(CPL_CLOSE_CON_RPL, do_hwtid_rpl);
1432         t3_register_cpl_handler(CPL_ABORT_REQ_RSS, do_abort_req_rss);
1433         t3_register_cpl_handler(CPL_ACT_ESTABLISH, do_act_establish);
1434         t3_register_cpl_handler(CPL_SET_TCB_RPL, do_hwtid_rpl);
1435         t3_register_cpl_handler(CPL_GET_TCB_RPL, do_hwtid_rpl);
1436         t3_register_cpl_handler(CPL_RDMA_TERMINATE, do_term);
1437         t3_register_cpl_handler(CPL_RDMA_EC_STATUS, do_hwtid_rpl);
1438         t3_register_cpl_handler(CPL_TRACE_PKT, do_trace);
1439         t3_register_cpl_handler(CPL_RX_DATA_DDP, do_hwtid_rpl);
1440         t3_register_cpl_handler(CPL_RX_DDP_COMPLETE, do_hwtid_rpl);
1441         t3_register_cpl_handler(CPL_ISCSI_HDR, do_hwtid_rpl);
1442 }