linux/drivers/net/ethernet/chelsio/cxgb3/cxgb3_offload.c
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   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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  34
  35#include <linux/list.h>
  36#include <linux/slab.h>
  37#include <net/neighbour.h>
  38#include <linux/notifier.h>
  39#include <linux/atomic.h>
  40#include <linux/proc_fs.h>
  41#include <linux/if_vlan.h>
  42#include <net/netevent.h>
  43#include <linux/highmem.h>
  44#include <linux/vmalloc.h>
  45#include <linux/export.h>
  46
  47#include "common.h"
  48#include "regs.h"
  49#include "cxgb3_ioctl.h"
  50#include "cxgb3_ctl_defs.h"
  51#include "cxgb3_defs.h"
  52#include "l2t.h"
  53#include "firmware_exports.h"
  54#include "cxgb3_offload.h"
  55
  56static LIST_HEAD(client_list);
  57static LIST_HEAD(ofld_dev_list);
  58static DEFINE_MUTEX(cxgb3_db_lock);
  59
  60static DEFINE_RWLOCK(adapter_list_lock);
  61static LIST_HEAD(adapter_list);
  62
  63static const unsigned int MAX_ATIDS = 64 * 1024;
  64static const unsigned int ATID_BASE = 0x10000;
  65
  66static void cxgb_neigh_update(struct neighbour *neigh);
  67static void cxgb_redirect(struct dst_entry *old, struct dst_entry *new,
  68                          struct neighbour *neigh, const void *daddr);
  69
  70static inline int offload_activated(struct t3cdev *tdev)
  71{
  72        const struct adapter *adapter = tdev2adap(tdev);
  73
  74        return test_bit(OFFLOAD_DEVMAP_BIT, &adapter->open_device_map);
  75}
  76
  77/**
  78 *      cxgb3_register_client - register an offload client
  79 *      @client: the client
  80 *
  81 *      Add the client to the client list,
  82 *      and call backs the client for each activated offload device
  83 */
  84void cxgb3_register_client(struct cxgb3_client *client)
  85{
  86        struct t3cdev *tdev;
  87
  88        mutex_lock(&cxgb3_db_lock);
  89        list_add_tail(&client->client_list, &client_list);
  90
  91        if (client->add) {
  92                list_for_each_entry(tdev, &ofld_dev_list, ofld_dev_list) {
  93                        if (offload_activated(tdev))
  94                                client->add(tdev);
  95                }
  96        }
  97        mutex_unlock(&cxgb3_db_lock);
  98}
  99
 100EXPORT_SYMBOL(cxgb3_register_client);
 101
 102/**
 103 *      cxgb3_unregister_client - unregister an offload client
 104 *      @client: the client
 105 *
 106 *      Remove the client to the client list,
 107 *      and call backs the client for each activated offload device.
 108 */
 109void cxgb3_unregister_client(struct cxgb3_client *client)
 110{
 111        struct t3cdev *tdev;
 112
 113        mutex_lock(&cxgb3_db_lock);
 114        list_del(&client->client_list);
 115
 116        if (client->remove) {
 117                list_for_each_entry(tdev, &ofld_dev_list, ofld_dev_list) {
 118                        if (offload_activated(tdev))
 119                                client->remove(tdev);
 120                }
 121        }
 122        mutex_unlock(&cxgb3_db_lock);
 123}
 124
 125EXPORT_SYMBOL(cxgb3_unregister_client);
 126
 127/**
 128 *      cxgb3_add_clients - activate registered clients for an offload device
 129 *      @tdev: the offload device
 130 *
 131 *      Call backs all registered clients once a offload device is activated
 132 */
 133void cxgb3_add_clients(struct t3cdev *tdev)
 134{
 135        struct cxgb3_client *client;
 136
 137        mutex_lock(&cxgb3_db_lock);
 138        list_for_each_entry(client, &client_list, client_list) {
 139                if (client->add)
 140                        client->add(tdev);
 141        }
 142        mutex_unlock(&cxgb3_db_lock);
 143}
 144
 145/**
 146 *      cxgb3_remove_clients - deactivates registered clients
 147 *                             for an offload device
 148 *      @tdev: the offload device
 149 *
 150 *      Call backs all registered clients once a offload device is deactivated
 151 */
 152void cxgb3_remove_clients(struct t3cdev *tdev)
 153{
 154        struct cxgb3_client *client;
 155
 156        mutex_lock(&cxgb3_db_lock);
 157        list_for_each_entry(client, &client_list, client_list) {
 158                if (client->remove)
 159                        client->remove(tdev);
 160        }
 161        mutex_unlock(&cxgb3_db_lock);
 162}
 163
 164void cxgb3_event_notify(struct t3cdev *tdev, u32 event, u32 port)
 165{
 166        struct cxgb3_client *client;
 167
 168        mutex_lock(&cxgb3_db_lock);
 169        list_for_each_entry(client, &client_list, client_list) {
 170                if (client->event_handler)
 171                        client->event_handler(tdev, event, port);
 172        }
 173        mutex_unlock(&cxgb3_db_lock);
 174}
 175
 176static struct net_device *get_iff_from_mac(struct adapter *adapter,
 177                                           const unsigned char *mac,
 178                                           unsigned int vlan)
 179{
 180        int i;
 181
 182        for_each_port(adapter, i) {
 183                struct net_device *dev = adapter->port[i];
 184
 185                if (ether_addr_equal(dev->dev_addr, mac)) {
 186                        rcu_read_lock();
 187                        if (vlan && vlan != VLAN_VID_MASK) {
 188                                dev = __vlan_find_dev_deep_rcu(dev, htons(ETH_P_8021Q), vlan);
 189                        } else if (netif_is_bond_slave(dev)) {
 190                                struct net_device *upper_dev;
 191
 192                                while ((upper_dev =
 193                                        netdev_master_upper_dev_get_rcu(dev)))
 194                                        dev = upper_dev;
 195                        }
 196                        rcu_read_unlock();
 197                        return dev;
 198                }
 199        }
 200        return NULL;
 201}
 202
 203static int cxgb_ulp_iscsi_ctl(struct adapter *adapter, unsigned int req,
 204                              void *data)
 205{
 206        int i;
 207        int ret = 0;
 208        unsigned int val = 0;
 209        struct ulp_iscsi_info *uiip = data;
 210
 211        switch (req) {
 212        case ULP_ISCSI_GET_PARAMS:
 213                uiip->pdev = adapter->pdev;
 214                uiip->llimit = t3_read_reg(adapter, A_ULPRX_ISCSI_LLIMIT);
 215                uiip->ulimit = t3_read_reg(adapter, A_ULPRX_ISCSI_ULIMIT);
 216                uiip->tagmask = t3_read_reg(adapter, A_ULPRX_ISCSI_TAGMASK);
 217
 218                val = t3_read_reg(adapter, A_ULPRX_ISCSI_PSZ);
 219                for (i = 0; i < 4; i++, val >>= 8)
 220                        uiip->pgsz_factor[i] = val & 0xFF;
 221
 222                val = t3_read_reg(adapter, A_TP_PARA_REG7);
 223                uiip->max_txsz =
 224                uiip->max_rxsz = min((val >> S_PMMAXXFERLEN0)&M_PMMAXXFERLEN0,
 225                                     (val >> S_PMMAXXFERLEN1)&M_PMMAXXFERLEN1);
 226                /*
 227                 * On tx, the iscsi pdu has to be <= tx page size and has to
 228                 * fit into the Tx PM FIFO.
 229                 */
 230                val = min(adapter->params.tp.tx_pg_size,
 231                          t3_read_reg(adapter, A_PM1_TX_CFG) >> 17);
 232                uiip->max_txsz = min(val, uiip->max_txsz);
 233
 234                /* set MaxRxData to 16224 */
 235                val = t3_read_reg(adapter, A_TP_PARA_REG2);
 236                if ((val >> S_MAXRXDATA) != 0x3f60) {
 237                        val &= (M_RXCOALESCESIZE << S_RXCOALESCESIZE);
 238                        val |= V_MAXRXDATA(0x3f60);
 239                        pr_info("%s, iscsi set MaxRxData to 16224 (0x%x)\n",
 240                                adapter->name, val);
 241                        t3_write_reg(adapter, A_TP_PARA_REG2, val);
 242                }
 243
 244                /*
 245                 * on rx, the iscsi pdu has to be < rx page size and the
 246                 * the max rx data length programmed in TP
 247                 */
 248                val = min(adapter->params.tp.rx_pg_size,
 249                          ((t3_read_reg(adapter, A_TP_PARA_REG2)) >>
 250                                S_MAXRXDATA) & M_MAXRXDATA);
 251                uiip->max_rxsz = min(val, uiip->max_rxsz);
 252                break;
 253        case ULP_ISCSI_SET_PARAMS:
 254                t3_write_reg(adapter, A_ULPRX_ISCSI_TAGMASK, uiip->tagmask);
 255                /* program the ddp page sizes */
 256                for (i = 0; i < 4; i++)
 257                        val |= (uiip->pgsz_factor[i] & 0xF) << (8 * i);
 258                if (val && (val != t3_read_reg(adapter, A_ULPRX_ISCSI_PSZ))) {
 259                        pr_info("%s, setting iscsi pgsz 0x%x, %u,%u,%u,%u\n",
 260                                adapter->name, val, uiip->pgsz_factor[0],
 261                                uiip->pgsz_factor[1], uiip->pgsz_factor[2],
 262                                uiip->pgsz_factor[3]);
 263                        t3_write_reg(adapter, A_ULPRX_ISCSI_PSZ, val);
 264                }
 265                break;
 266        default:
 267                ret = -EOPNOTSUPP;
 268        }
 269        return ret;
 270}
 271
 272/* Response queue used for RDMA events. */
 273#define ASYNC_NOTIF_RSPQ 0
 274
 275static int cxgb_rdma_ctl(struct adapter *adapter, unsigned int req, void *data)
 276{
 277        int ret = 0;
 278
 279        switch (req) {
 280        case RDMA_GET_PARAMS: {
 281                struct rdma_info *rdma = data;
 282                struct pci_dev *pdev = adapter->pdev;
 283
 284                rdma->udbell_physbase = pci_resource_start(pdev, 2);
 285                rdma->udbell_len = pci_resource_len(pdev, 2);
 286                rdma->tpt_base =
 287                        t3_read_reg(adapter, A_ULPTX_TPT_LLIMIT);
 288                rdma->tpt_top = t3_read_reg(adapter, A_ULPTX_TPT_ULIMIT);
 289                rdma->pbl_base =
 290                        t3_read_reg(adapter, A_ULPTX_PBL_LLIMIT);
 291                rdma->pbl_top = t3_read_reg(adapter, A_ULPTX_PBL_ULIMIT);
 292                rdma->rqt_base = t3_read_reg(adapter, A_ULPRX_RQ_LLIMIT);
 293                rdma->rqt_top = t3_read_reg(adapter, A_ULPRX_RQ_ULIMIT);
 294                rdma->kdb_addr = adapter->regs + A_SG_KDOORBELL;
 295                rdma->pdev = pdev;
 296                break;
 297        }
 298        case RDMA_CQ_OP:{
 299                unsigned long flags;
 300                struct rdma_cq_op *rdma = data;
 301
 302                /* may be called in any context */
 303                spin_lock_irqsave(&adapter->sge.reg_lock, flags);
 304                ret = t3_sge_cqcntxt_op(adapter, rdma->id, rdma->op,
 305                                        rdma->credits);
 306                spin_unlock_irqrestore(&adapter->sge.reg_lock, flags);
 307                break;
 308        }
 309        case RDMA_GET_MEM:{
 310                struct ch_mem_range *t = data;
 311                struct mc7 *mem;
 312
 313                if ((t->addr & 7) || (t->len & 7))
 314                        return -EINVAL;
 315                if (t->mem_id == MEM_CM)
 316                        mem = &adapter->cm;
 317                else if (t->mem_id == MEM_PMRX)
 318                        mem = &adapter->pmrx;
 319                else if (t->mem_id == MEM_PMTX)
 320                        mem = &adapter->pmtx;
 321                else
 322                        return -EINVAL;
 323
 324                ret =
 325                        t3_mc7_bd_read(mem, t->addr / 8, t->len / 8,
 326                                        (u64 *) t->buf);
 327                if (ret)
 328                        return ret;
 329                break;
 330        }
 331        case RDMA_CQ_SETUP:{
 332                struct rdma_cq_setup *rdma = data;
 333
 334                spin_lock_irq(&adapter->sge.reg_lock);
 335                ret =
 336                        t3_sge_init_cqcntxt(adapter, rdma->id,
 337                                        rdma->base_addr, rdma->size,
 338                                        ASYNC_NOTIF_RSPQ,
 339                                        rdma->ovfl_mode, rdma->credits,
 340                                        rdma->credit_thres);
 341                spin_unlock_irq(&adapter->sge.reg_lock);
 342                break;
 343        }
 344        case RDMA_CQ_DISABLE:
 345                spin_lock_irq(&adapter->sge.reg_lock);
 346                ret = t3_sge_disable_cqcntxt(adapter, *(unsigned int *)data);
 347                spin_unlock_irq(&adapter->sge.reg_lock);
 348                break;
 349        case RDMA_CTRL_QP_SETUP:{
 350                struct rdma_ctrlqp_setup *rdma = data;
 351
 352                spin_lock_irq(&adapter->sge.reg_lock);
 353                ret = t3_sge_init_ecntxt(adapter, FW_RI_SGEEC_START, 0,
 354                                                SGE_CNTXT_RDMA,
 355                                                ASYNC_NOTIF_RSPQ,
 356                                                rdma->base_addr, rdma->size,
 357                                                FW_RI_TID_START, 1, 0);
 358                spin_unlock_irq(&adapter->sge.reg_lock);
 359                break;
 360        }
 361        case RDMA_GET_MIB: {
 362                spin_lock(&adapter->stats_lock);
 363                t3_tp_get_mib_stats(adapter, (struct tp_mib_stats *)data);
 364                spin_unlock(&adapter->stats_lock);
 365                break;
 366        }
 367        default:
 368                ret = -EOPNOTSUPP;
 369        }
 370        return ret;
 371}
 372
 373static int cxgb_offload_ctl(struct t3cdev *tdev, unsigned int req, void *data)
 374{
 375        struct adapter *adapter = tdev2adap(tdev);
 376        struct tid_range *tid;
 377        struct mtutab *mtup;
 378        struct iff_mac *iffmacp;
 379        struct ddp_params *ddpp;
 380        struct adap_ports *ports;
 381        struct ofld_page_info *rx_page_info;
 382        struct tp_params *tp = &adapter->params.tp;
 383        int i;
 384
 385        switch (req) {
 386        case GET_MAX_OUTSTANDING_WR:
 387                *(unsigned int *)data = FW_WR_NUM;
 388                break;
 389        case GET_WR_LEN:
 390                *(unsigned int *)data = WR_FLITS;
 391                break;
 392        case GET_TX_MAX_CHUNK:
 393                *(unsigned int *)data = 1 << 20;        /* 1MB */
 394                break;
 395        case GET_TID_RANGE:
 396                tid = data;
 397                tid->num = t3_mc5_size(&adapter->mc5) -
 398                    adapter->params.mc5.nroutes -
 399                    adapter->params.mc5.nfilters - adapter->params.mc5.nservers;
 400                tid->base = 0;
 401                break;
 402        case GET_STID_RANGE:
 403                tid = data;
 404                tid->num = adapter->params.mc5.nservers;
 405                tid->base = t3_mc5_size(&adapter->mc5) - tid->num -
 406                    adapter->params.mc5.nfilters - adapter->params.mc5.nroutes;
 407                break;
 408        case GET_L2T_CAPACITY:
 409                *(unsigned int *)data = 2048;
 410                break;
 411        case GET_MTUS:
 412                mtup = data;
 413                mtup->size = NMTUS;
 414                mtup->mtus = adapter->params.mtus;
 415                break;
 416        case GET_IFF_FROM_MAC:
 417                iffmacp = data;
 418                iffmacp->dev = get_iff_from_mac(adapter, iffmacp->mac_addr,
 419                                                iffmacp->vlan_tag &
 420                                                VLAN_VID_MASK);
 421                break;
 422        case GET_DDP_PARAMS:
 423                ddpp = data;
 424                ddpp->llimit = t3_read_reg(adapter, A_ULPRX_TDDP_LLIMIT);
 425                ddpp->ulimit = t3_read_reg(adapter, A_ULPRX_TDDP_ULIMIT);
 426                ddpp->tag_mask = t3_read_reg(adapter, A_ULPRX_TDDP_TAGMASK);
 427                break;
 428        case GET_PORTS:
 429                ports = data;
 430                ports->nports = adapter->params.nports;
 431                for_each_port(adapter, i)
 432                        ports->lldevs[i] = adapter->port[i];
 433                break;
 434        case ULP_ISCSI_GET_PARAMS:
 435        case ULP_ISCSI_SET_PARAMS:
 436                if (!offload_running(adapter))
 437                        return -EAGAIN;
 438                return cxgb_ulp_iscsi_ctl(adapter, req, data);
 439        case RDMA_GET_PARAMS:
 440        case RDMA_CQ_OP:
 441        case RDMA_CQ_SETUP:
 442        case RDMA_CQ_DISABLE:
 443        case RDMA_CTRL_QP_SETUP:
 444        case RDMA_GET_MEM:
 445        case RDMA_GET_MIB:
 446                if (!offload_running(adapter))
 447                        return -EAGAIN;
 448                return cxgb_rdma_ctl(adapter, req, data);
 449        case GET_RX_PAGE_INFO:
 450                rx_page_info = data;
 451                rx_page_info->page_size = tp->rx_pg_size;
 452                rx_page_info->num = tp->rx_num_pgs;
 453                break;
 454        case GET_ISCSI_IPV4ADDR: {
 455                struct iscsi_ipv4addr *p = data;
 456                struct port_info *pi = netdev_priv(p->dev);
 457                p->ipv4addr = pi->iscsi_ipv4addr;
 458                break;
 459        }
 460        case GET_EMBEDDED_INFO: {
 461                struct ch_embedded_info *e = data;
 462
 463                spin_lock(&adapter->stats_lock);
 464                t3_get_fw_version(adapter, &e->fw_vers);
 465                t3_get_tp_version(adapter, &e->tp_vers);
 466                spin_unlock(&adapter->stats_lock);
 467                break;
 468        }
 469        default:
 470                return -EOPNOTSUPP;
 471        }
 472        return 0;
 473}
 474
 475/*
 476 * Dummy handler for Rx offload packets in case we get an offload packet before
 477 * proper processing is setup.  This complains and drops the packet as it isn't
 478 * normal to get offload packets at this stage.
 479 */
 480static int rx_offload_blackhole(struct t3cdev *dev, struct sk_buff **skbs,
 481                                int n)
 482{
 483        while (n--)
 484                dev_kfree_skb_any(skbs[n]);
 485        return 0;
 486}
 487
 488static void dummy_neigh_update(struct t3cdev *dev, struct neighbour *neigh)
 489{
 490}
 491
 492void cxgb3_set_dummy_ops(struct t3cdev *dev)
 493{
 494        dev->recv = rx_offload_blackhole;
 495        dev->neigh_update = dummy_neigh_update;
 496}
 497
 498/*
 499 * Free an active-open TID.
 500 */
 501void *cxgb3_free_atid(struct t3cdev *tdev, int atid)
 502{
 503        struct tid_info *t = &(T3C_DATA(tdev))->tid_maps;
 504        union active_open_entry *p = atid2entry(t, atid);
 505        void *ctx = p->t3c_tid.ctx;
 506
 507        spin_lock_bh(&t->atid_lock);
 508        p->next = t->afree;
 509        t->afree = p;
 510        t->atids_in_use--;
 511        spin_unlock_bh(&t->atid_lock);
 512
 513        return ctx;
 514}
 515
 516EXPORT_SYMBOL(cxgb3_free_atid);
 517
 518/*
 519 * Free a server TID and return it to the free pool.
 520 */
 521void cxgb3_free_stid(struct t3cdev *tdev, int stid)
 522{
 523        struct tid_info *t = &(T3C_DATA(tdev))->tid_maps;
 524        union listen_entry *p = stid2entry(t, stid);
 525
 526        spin_lock_bh(&t->stid_lock);
 527        p->next = t->sfree;
 528        t->sfree = p;
 529        t->stids_in_use--;
 530        spin_unlock_bh(&t->stid_lock);
 531}
 532
 533EXPORT_SYMBOL(cxgb3_free_stid);
 534
 535void cxgb3_insert_tid(struct t3cdev *tdev, struct cxgb3_client *client,
 536                      void *ctx, unsigned int tid)
 537{
 538        struct tid_info *t = &(T3C_DATA(tdev))->tid_maps;
 539
 540        t->tid_tab[tid].client = client;
 541        t->tid_tab[tid].ctx = ctx;
 542        atomic_inc(&t->tids_in_use);
 543}
 544
 545EXPORT_SYMBOL(cxgb3_insert_tid);
 546
 547/*
 548 * Populate a TID_RELEASE WR.  The skb must be already propely sized.
 549 */
 550static inline void mk_tid_release(struct sk_buff *skb, unsigned int tid)
 551{
 552        struct cpl_tid_release *req;
 553
 554        skb->priority = CPL_PRIORITY_SETUP;
 555        req = __skb_put(skb, sizeof(*req));
 556        req->wr.wr_hi = htonl(V_WR_OP(FW_WROPCODE_FORWARD));
 557        OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_TID_RELEASE, tid));
 558}
 559
 560static void t3_process_tid_release_list(struct work_struct *work)
 561{
 562        struct t3c_data *td = container_of(work, struct t3c_data,
 563                                           tid_release_task);
 564        struct sk_buff *skb;
 565        struct t3cdev *tdev = td->dev;
 566
 567
 568        spin_lock_bh(&td->tid_release_lock);
 569        while (td->tid_release_list) {
 570                struct t3c_tid_entry *p = td->tid_release_list;
 571
 572                td->tid_release_list = p->ctx;
 573                spin_unlock_bh(&td->tid_release_lock);
 574
 575                skb = alloc_skb(sizeof(struct cpl_tid_release),
 576                                GFP_KERNEL);
 577                if (!skb)
 578                        skb = td->nofail_skb;
 579                if (!skb) {
 580                        spin_lock_bh(&td->tid_release_lock);
 581                        p->ctx = (void *)td->tid_release_list;
 582                        td->tid_release_list = p;
 583                        break;
 584                }
 585                mk_tid_release(skb, p - td->tid_maps.tid_tab);
 586                cxgb3_ofld_send(tdev, skb);
 587                p->ctx = NULL;
 588                if (skb == td->nofail_skb)
 589                        td->nofail_skb =
 590                                alloc_skb(sizeof(struct cpl_tid_release),
 591                                        GFP_KERNEL);
 592                spin_lock_bh(&td->tid_release_lock);
 593        }
 594        td->release_list_incomplete = (td->tid_release_list == NULL) ? 0 : 1;
 595        spin_unlock_bh(&td->tid_release_lock);
 596
 597        if (!td->nofail_skb)
 598                td->nofail_skb =
 599                        alloc_skb(sizeof(struct cpl_tid_release),
 600                                GFP_KERNEL);
 601}
 602
 603/* use ctx as a next pointer in the tid release list */
 604void cxgb3_queue_tid_release(struct t3cdev *tdev, unsigned int tid)
 605{
 606        struct t3c_data *td = T3C_DATA(tdev);
 607        struct t3c_tid_entry *p = &td->tid_maps.tid_tab[tid];
 608
 609        spin_lock_bh(&td->tid_release_lock);
 610        p->ctx = (void *)td->tid_release_list;
 611        p->client = NULL;
 612        td->tid_release_list = p;
 613        if (!p->ctx || td->release_list_incomplete)
 614                schedule_work(&td->tid_release_task);
 615        spin_unlock_bh(&td->tid_release_lock);
 616}
 617
 618EXPORT_SYMBOL(cxgb3_queue_tid_release);
 619
 620/*
 621 * Remove a tid from the TID table.  A client may defer processing its last
 622 * CPL message if it is locked at the time it arrives, and while the message
 623 * sits in the client's backlog the TID may be reused for another connection.
 624 * To handle this we atomically switch the TID association if it still points
 625 * to the original client context.
 626 */
 627void cxgb3_remove_tid(struct t3cdev *tdev, void *ctx, unsigned int tid)
 628{
 629        struct tid_info *t = &(T3C_DATA(tdev))->tid_maps;
 630
 631        BUG_ON(tid >= t->ntids);
 632        if (tdev->type == T3A)
 633                (void)cmpxchg(&t->tid_tab[tid].ctx, ctx, NULL);
 634        else {
 635                struct sk_buff *skb;
 636
 637                skb = alloc_skb(sizeof(struct cpl_tid_release), GFP_ATOMIC);
 638                if (likely(skb)) {
 639                        mk_tid_release(skb, tid);
 640                        cxgb3_ofld_send(tdev, skb);
 641                        t->tid_tab[tid].ctx = NULL;
 642                } else
 643                        cxgb3_queue_tid_release(tdev, tid);
 644        }
 645        atomic_dec(&t->tids_in_use);
 646}
 647
 648EXPORT_SYMBOL(cxgb3_remove_tid);
 649
 650int cxgb3_alloc_atid(struct t3cdev *tdev, struct cxgb3_client *client,
 651                     void *ctx)
 652{
 653        int atid = -1;
 654        struct tid_info *t = &(T3C_DATA(tdev))->tid_maps;
 655
 656        spin_lock_bh(&t->atid_lock);
 657        if (t->afree &&
 658            t->atids_in_use + atomic_read(&t->tids_in_use) + MC5_MIN_TIDS <=
 659            t->ntids) {
 660                union active_open_entry *p = t->afree;
 661
 662                atid = (p - t->atid_tab) + t->atid_base;
 663                t->afree = p->next;
 664                p->t3c_tid.ctx = ctx;
 665                p->t3c_tid.client = client;
 666                t->atids_in_use++;
 667        }
 668        spin_unlock_bh(&t->atid_lock);
 669        return atid;
 670}
 671
 672EXPORT_SYMBOL(cxgb3_alloc_atid);
 673
 674int cxgb3_alloc_stid(struct t3cdev *tdev, struct cxgb3_client *client,
 675                     void *ctx)
 676{
 677        int stid = -1;
 678        struct tid_info *t = &(T3C_DATA(tdev))->tid_maps;
 679
 680        spin_lock_bh(&t->stid_lock);
 681        if (t->sfree) {
 682                union listen_entry *p = t->sfree;
 683
 684                stid = (p - t->stid_tab) + t->stid_base;
 685                t->sfree = p->next;
 686                p->t3c_tid.ctx = ctx;
 687                p->t3c_tid.client = client;
 688                t->stids_in_use++;
 689        }
 690        spin_unlock_bh(&t->stid_lock);
 691        return stid;
 692}
 693
 694EXPORT_SYMBOL(cxgb3_alloc_stid);
 695
 696/* Get the t3cdev associated with a net_device */
 697struct t3cdev *dev2t3cdev(struct net_device *dev)
 698{
 699        const struct port_info *pi = netdev_priv(dev);
 700
 701        return (struct t3cdev *)pi->adapter;
 702}
 703
 704EXPORT_SYMBOL(dev2t3cdev);
 705
 706static int do_smt_write_rpl(struct t3cdev *dev, struct sk_buff *skb)
 707{
 708        struct cpl_smt_write_rpl *rpl = cplhdr(skb);
 709
 710        if (rpl->status != CPL_ERR_NONE)
 711                pr_err("Unexpected SMT_WRITE_RPL status %u for entry %u\n",
 712                       rpl->status, GET_TID(rpl));
 713
 714        return CPL_RET_BUF_DONE;
 715}
 716
 717static int do_l2t_write_rpl(struct t3cdev *dev, struct sk_buff *skb)
 718{
 719        struct cpl_l2t_write_rpl *rpl = cplhdr(skb);
 720
 721        if (rpl->status != CPL_ERR_NONE)
 722                pr_err("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
 728static 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                pr_err("Unexpected RTE_WRITE_RPL status %u for entry %u\n",
 734                       rpl->status, GET_TID(rpl));
 735
 736        return CPL_RET_BUF_DONE;
 737}
 738
 739static int do_act_open_rpl(struct t3cdev *dev, struct sk_buff *skb)
 740{
 741        struct cpl_act_open_rpl *rpl = cplhdr(skb);
 742        unsigned int atid = G_TID(ntohl(rpl->atid));
 743        struct t3c_tid_entry *t3c_tid;
 744
 745        t3c_tid = lookup_atid(&(T3C_DATA(dev))->tid_maps, atid);
 746        if (t3c_tid && t3c_tid->ctx && t3c_tid->client &&
 747            t3c_tid->client->handlers &&
 748            t3c_tid->client->handlers[CPL_ACT_OPEN_RPL]) {
 749                return t3c_tid->client->handlers[CPL_ACT_OPEN_RPL] (dev, skb,
 750                                                                    t3c_tid->
 751                                                                    ctx);
 752        } else {
 753                pr_err("%s: received clientless CPL command 0x%x\n",
 754                       dev->name, CPL_ACT_OPEN_RPL);
 755                return CPL_RET_BUF_DONE | CPL_RET_BAD_MSG;
 756        }
 757}
 758
 759static int do_stid_rpl(struct t3cdev *dev, struct sk_buff *skb)
 760{
 761        union opcode_tid *p = cplhdr(skb);
 762        unsigned int stid = G_TID(ntohl(p->opcode_tid));
 763        struct t3c_tid_entry *t3c_tid;
 764
 765        t3c_tid = lookup_stid(&(T3C_DATA(dev))->tid_maps, stid);
 766        if (t3c_tid && t3c_tid->ctx && t3c_tid->client->handlers &&
 767            t3c_tid->client->handlers[p->opcode]) {
 768                return t3c_tid->client->handlers[p->opcode] (dev, skb,
 769                                                             t3c_tid->ctx);
 770        } else {
 771                pr_err("%s: received clientless CPL command 0x%x\n",
 772                       dev->name, p->opcode);
 773                return CPL_RET_BUF_DONE | CPL_RET_BAD_MSG;
 774        }
 775}
 776
 777static int do_hwtid_rpl(struct t3cdev *dev, struct sk_buff *skb)
 778{
 779        union opcode_tid *p = cplhdr(skb);
 780        unsigned int hwtid = G_TID(ntohl(p->opcode_tid));
 781        struct t3c_tid_entry *t3c_tid;
 782
 783        t3c_tid = lookup_tid(&(T3C_DATA(dev))->tid_maps, hwtid);
 784        if (t3c_tid && t3c_tid->ctx && t3c_tid->client->handlers &&
 785            t3c_tid->client->handlers[p->opcode]) {
 786                return t3c_tid->client->handlers[p->opcode]
 787                    (dev, skb, t3c_tid->ctx);
 788        } else {
 789                pr_err("%s: received clientless CPL command 0x%x\n",
 790                       dev->name, p->opcode);
 791                return CPL_RET_BUF_DONE | CPL_RET_BAD_MSG;
 792        }
 793}
 794
 795static int do_cr(struct t3cdev *dev, struct sk_buff *skb)
 796{
 797        struct cpl_pass_accept_req *req = cplhdr(skb);
 798        unsigned int stid = G_PASS_OPEN_TID(ntohl(req->tos_tid));
 799        struct tid_info *t = &(T3C_DATA(dev))->tid_maps;
 800        struct t3c_tid_entry *t3c_tid;
 801        unsigned int tid = GET_TID(req);
 802
 803        if (unlikely(tid >= t->ntids)) {
 804                printk("%s: passive open TID %u too large\n",
 805                       dev->name, tid);
 806                t3_fatal_err(tdev2adap(dev));
 807                return CPL_RET_BUF_DONE;
 808        }
 809
 810        t3c_tid = lookup_stid(t, stid);
 811        if (t3c_tid && t3c_tid->ctx && t3c_tid->client->handlers &&
 812            t3c_tid->client->handlers[CPL_PASS_ACCEPT_REQ]) {
 813                return t3c_tid->client->handlers[CPL_PASS_ACCEPT_REQ]
 814                    (dev, skb, t3c_tid->ctx);
 815        } else {
 816                pr_err("%s: received clientless CPL command 0x%x\n",
 817                       dev->name, CPL_PASS_ACCEPT_REQ);
 818                return CPL_RET_BUF_DONE | CPL_RET_BAD_MSG;
 819        }
 820}
 821
 822/*
 823 * Returns an sk_buff for a reply CPL message of size len.  If the input
 824 * sk_buff has no other users it is trimmed and reused, otherwise a new buffer
 825 * is allocated.  The input skb must be of size at least len.  Note that this
 826 * operation does not destroy the original skb data even if it decides to reuse
 827 * the buffer.
 828 */
 829static struct sk_buff *cxgb3_get_cpl_reply_skb(struct sk_buff *skb, size_t len,
 830                                               gfp_t gfp)
 831{
 832        if (likely(!skb_cloned(skb))) {
 833                BUG_ON(skb->len < len);
 834                __skb_trim(skb, len);
 835                skb_get(skb);
 836        } else {
 837                skb = alloc_skb(len, gfp);
 838                if (skb)
 839                        __skb_put(skb, len);
 840        }
 841        return skb;
 842}
 843
 844static int do_abort_req_rss(struct t3cdev *dev, struct sk_buff *skb)
 845{
 846        union opcode_tid *p = cplhdr(skb);
 847        unsigned int hwtid = G_TID(ntohl(p->opcode_tid));
 848        struct t3c_tid_entry *t3c_tid;
 849
 850        t3c_tid = lookup_tid(&(T3C_DATA(dev))->tid_maps, hwtid);
 851        if (t3c_tid && t3c_tid->ctx && t3c_tid->client->handlers &&
 852            t3c_tid->client->handlers[p->opcode]) {
 853                return t3c_tid->client->handlers[p->opcode]
 854                    (dev, skb, t3c_tid->ctx);
 855        } else {
 856                struct cpl_abort_req_rss *req = cplhdr(skb);
 857                struct cpl_abort_rpl *rpl;
 858                struct sk_buff *reply_skb;
 859                unsigned int tid = GET_TID(req);
 860                u8 cmd = req->status;
 861
 862                if (req->status == CPL_ERR_RTX_NEG_ADVICE ||
 863                    req->status == CPL_ERR_PERSIST_NEG_ADVICE)
 864                        goto out;
 865
 866                reply_skb = cxgb3_get_cpl_reply_skb(skb,
 867                                                    sizeof(struct
 868                                                           cpl_abort_rpl),
 869                                                    GFP_ATOMIC);
 870
 871                if (!reply_skb) {
 872                        printk("do_abort_req_rss: couldn't get skb!\n");
 873                        goto out;
 874                }
 875                reply_skb->priority = CPL_PRIORITY_DATA;
 876                __skb_put(reply_skb, sizeof(struct cpl_abort_rpl));
 877                rpl = cplhdr(reply_skb);
 878                rpl->wr.wr_hi =
 879                    htonl(V_WR_OP(FW_WROPCODE_OFLD_HOST_ABORT_CON_RPL));
 880                rpl->wr.wr_lo = htonl(V_WR_TID(tid));
 881                OPCODE_TID(rpl) = htonl(MK_OPCODE_TID(CPL_ABORT_RPL, tid));
 882                rpl->cmd = cmd;
 883                cxgb3_ofld_send(dev, reply_skb);
 884out:
 885                return CPL_RET_BUF_DONE;
 886        }
 887}
 888
 889static int do_act_establish(struct t3cdev *dev, struct sk_buff *skb)
 890{
 891        struct cpl_act_establish *req = cplhdr(skb);
 892        unsigned int atid = G_PASS_OPEN_TID(ntohl(req->tos_tid));
 893        struct tid_info *t = &(T3C_DATA(dev))->tid_maps;
 894        struct t3c_tid_entry *t3c_tid;
 895        unsigned int tid = GET_TID(req);
 896
 897        if (unlikely(tid >= t->ntids)) {
 898                printk("%s: active establish TID %u too large\n",
 899                       dev->name, tid);
 900                t3_fatal_err(tdev2adap(dev));
 901                return CPL_RET_BUF_DONE;
 902        }
 903
 904        t3c_tid = lookup_atid(t, atid);
 905        if (t3c_tid && t3c_tid->ctx && t3c_tid->client->handlers &&
 906            t3c_tid->client->handlers[CPL_ACT_ESTABLISH]) {
 907                return t3c_tid->client->handlers[CPL_ACT_ESTABLISH]
 908                    (dev, skb, t3c_tid->ctx);
 909        } else {
 910                pr_err("%s: received clientless CPL command 0x%x\n",
 911                       dev->name, CPL_ACT_ESTABLISH);
 912                return CPL_RET_BUF_DONE | CPL_RET_BAD_MSG;
 913        }
 914}
 915
 916static int do_trace(struct t3cdev *dev, struct sk_buff *skb)
 917{
 918        struct cpl_trace_pkt *p = cplhdr(skb);
 919
 920        skb->protocol = htons(0xffff);
 921        skb->dev = dev->lldev;
 922        skb_pull(skb, sizeof(*p));
 923        skb_reset_mac_header(skb);
 924        netif_receive_skb(skb);
 925        return 0;
 926}
 927
 928/*
 929 * That skb would better have come from process_responses() where we abuse
 930 * ->priority and ->csum to carry our data.  NB: if we get to per-arch
 931 * ->csum, the things might get really interesting here.
 932 */
 933
 934static inline u32 get_hwtid(struct sk_buff *skb)
 935{
 936        return ntohl((__force __be32)skb->priority) >> 8 & 0xfffff;
 937}
 938
 939static inline u32 get_opcode(struct sk_buff *skb)
 940{
 941        return G_OPCODE(ntohl((__force __be32)skb->csum));
 942}
 943
 944static int do_term(struct t3cdev *dev, struct sk_buff *skb)
 945{
 946        unsigned int hwtid = get_hwtid(skb);
 947        unsigned int opcode = get_opcode(skb);
 948        struct t3c_tid_entry *t3c_tid;
 949
 950        t3c_tid = lookup_tid(&(T3C_DATA(dev))->tid_maps, hwtid);
 951        if (t3c_tid && t3c_tid->ctx && t3c_tid->client->handlers &&
 952            t3c_tid->client->handlers[opcode]) {
 953                return t3c_tid->client->handlers[opcode] (dev, skb,
 954                                                          t3c_tid->ctx);
 955        } else {
 956                pr_err("%s: received clientless CPL command 0x%x\n",
 957                       dev->name, opcode);
 958                return CPL_RET_BUF_DONE | CPL_RET_BAD_MSG;
 959        }
 960}
 961
 962static int nb_callback(struct notifier_block *self, unsigned long event,
 963                       void *ctx)
 964{
 965        switch (event) {
 966        case (NETEVENT_NEIGH_UPDATE):{
 967                cxgb_neigh_update((struct neighbour *)ctx);
 968                break;
 969        }
 970        case (NETEVENT_REDIRECT):{
 971                struct netevent_redirect *nr = ctx;
 972                cxgb_redirect(nr->old, nr->new, nr->neigh,
 973                              nr->daddr);
 974                cxgb_neigh_update(nr->neigh);
 975                break;
 976        }
 977        default:
 978                break;
 979        }
 980        return 0;
 981}
 982
 983static struct notifier_block nb = {
 984        .notifier_call = nb_callback
 985};
 986
 987/*
 988 * Process a received packet with an unknown/unexpected CPL opcode.
 989 */
 990static int do_bad_cpl(struct t3cdev *dev, struct sk_buff *skb)
 991{
 992        pr_err("%s: received bad CPL command 0x%x\n", dev->name, *skb->data);
 993        return CPL_RET_BUF_DONE | CPL_RET_BAD_MSG;
 994}
 995
 996/*
 997 * Handlers for each CPL opcode
 998 */
 999static cpl_handler_func cpl_handlers[NUM_CPL_CMDS];
1000
1001/*
1002 * Add a new handler to the CPL dispatch table.  A NULL handler may be supplied
1003 * to unregister an existing handler.
1004 */
1005void t3_register_cpl_handler(unsigned int opcode, cpl_handler_func h)
1006{
1007        if (opcode < NUM_CPL_CMDS)
1008                cpl_handlers[opcode] = h ? h : do_bad_cpl;
1009        else
1010                pr_err("T3C: handler registration for opcode %x failed\n",
1011                       opcode);
1012}
1013
1014EXPORT_SYMBOL(t3_register_cpl_handler);
1015
1016/*
1017 * T3CDEV's receive method.
1018 */
1019static int process_rx(struct t3cdev *dev, struct sk_buff **skbs, int n)
1020{
1021        while (n--) {
1022                struct sk_buff *skb = *skbs++;
1023                unsigned int opcode = get_opcode(skb);
1024                int ret = cpl_handlers[opcode] (dev, skb);
1025
1026#if VALIDATE_TID
1027                if (ret & CPL_RET_UNKNOWN_TID) {
1028                        union opcode_tid *p = cplhdr(skb);
1029
1030                        pr_err("%s: CPL message (opcode %u) had unknown TID %u\n",
1031                               dev->name, opcode, G_TID(ntohl(p->opcode_tid)));
1032                }
1033#endif
1034                if (ret & CPL_RET_BUF_DONE)
1035                        kfree_skb(skb);
1036        }
1037        return 0;
1038}
1039
1040/*
1041 * Sends an sk_buff to a T3C driver after dealing with any active network taps.
1042 */
1043int cxgb3_ofld_send(struct t3cdev *dev, struct sk_buff *skb)
1044{
1045        int r;
1046
1047        local_bh_disable();
1048        r = dev->send(dev, skb);
1049        local_bh_enable();
1050        return r;
1051}
1052
1053EXPORT_SYMBOL(cxgb3_ofld_send);
1054
1055static int is_offloading(struct net_device *dev)
1056{
1057        struct adapter *adapter;
1058        int i;
1059
1060        read_lock_bh(&adapter_list_lock);
1061        list_for_each_entry(adapter, &adapter_list, adapter_list) {
1062                for_each_port(adapter, i) {
1063                        if (dev == adapter->port[i]) {
1064                                read_unlock_bh(&adapter_list_lock);
1065                                return 1;
1066                        }
1067                }
1068        }
1069        read_unlock_bh(&adapter_list_lock);
1070        return 0;
1071}
1072
1073static void cxgb_neigh_update(struct neighbour *neigh)
1074{
1075        struct net_device *dev;
1076
1077        if (!neigh)
1078                return;
1079        dev = neigh->dev;
1080        if (dev && (is_offloading(dev))) {
1081                struct t3cdev *tdev = dev2t3cdev(dev);
1082
1083                BUG_ON(!tdev);
1084                t3_l2t_update(tdev, neigh);
1085        }
1086}
1087
1088static void set_l2t_ix(struct t3cdev *tdev, u32 tid, struct l2t_entry *e)
1089{
1090        struct sk_buff *skb;
1091        struct cpl_set_tcb_field *req;
1092
1093        skb = alloc_skb(sizeof(*req), GFP_ATOMIC);
1094        if (!skb) {
1095                pr_err("%s: cannot allocate skb!\n", __func__);
1096                return;
1097        }
1098        skb->priority = CPL_PRIORITY_CONTROL;
1099        req = skb_put(skb, sizeof(*req));
1100        req->wr.wr_hi = htonl(V_WR_OP(FW_WROPCODE_FORWARD));
1101        OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_SET_TCB_FIELD, tid));
1102        req->reply = 0;
1103        req->cpu_idx = 0;
1104        req->word = htons(W_TCB_L2T_IX);
1105        req->mask = cpu_to_be64(V_TCB_L2T_IX(M_TCB_L2T_IX));
1106        req->val = cpu_to_be64(V_TCB_L2T_IX(e->idx));
1107        tdev->send(tdev, skb);
1108}
1109
1110static void cxgb_redirect(struct dst_entry *old, struct dst_entry *new,
1111                          struct neighbour *neigh,
1112                          const void *daddr)
1113{
1114        struct net_device *dev;
1115        struct tid_info *ti;
1116        struct t3cdev *tdev;
1117        u32 tid;
1118        int update_tcb;
1119        struct l2t_entry *e;
1120        struct t3c_tid_entry *te;
1121
1122        dev = neigh->dev;
1123
1124        if (!is_offloading(dev))
1125                return;
1126        tdev = dev2t3cdev(dev);
1127        BUG_ON(!tdev);
1128
1129        /* Add new L2T entry */
1130        e = t3_l2t_get(tdev, new, dev, daddr);
1131        if (!e) {
1132                pr_err("%s: couldn't allocate new l2t entry!\n", __func__);
1133                return;
1134        }
1135
1136        /* Walk tid table and notify clients of dst change. */
1137        ti = &(T3C_DATA(tdev))->tid_maps;
1138        for (tid = 0; tid < ti->ntids; tid++) {
1139                te = lookup_tid(ti, tid);
1140                BUG_ON(!te);
1141                if (te && te->ctx && te->client && te->client->redirect) {
1142                        update_tcb = te->client->redirect(te->ctx, old, new, e);
1143                        if (update_tcb) {
1144                                rcu_read_lock();
1145                                l2t_hold(L2DATA(tdev), e);
1146                                rcu_read_unlock();
1147                                set_l2t_ix(tdev, tid, e);
1148                        }
1149                }
1150        }
1151        l2t_release(tdev, e);
1152}
1153
1154/*
1155 * Allocate and initialize the TID tables.  Returns 0 on success.
1156 */
1157static int init_tid_tabs(struct tid_info *t, unsigned int ntids,
1158                         unsigned int natids, unsigned int nstids,
1159                         unsigned int atid_base, unsigned int stid_base)
1160{
1161        unsigned long size = ntids * sizeof(*t->tid_tab) +
1162            natids * sizeof(*t->atid_tab) + nstids * sizeof(*t->stid_tab);
1163
1164        t->tid_tab = kvzalloc(size, GFP_KERNEL);
1165        if (!t->tid_tab)
1166                return -ENOMEM;
1167
1168        t->stid_tab = (union listen_entry *)&t->tid_tab[ntids];
1169        t->atid_tab = (union active_open_entry *)&t->stid_tab[nstids];
1170        t->ntids = ntids;
1171        t->nstids = nstids;
1172        t->stid_base = stid_base;
1173        t->sfree = NULL;
1174        t->natids = natids;
1175        t->atid_base = atid_base;
1176        t->afree = NULL;
1177        t->stids_in_use = t->atids_in_use = 0;
1178        atomic_set(&t->tids_in_use, 0);
1179        spin_lock_init(&t->stid_lock);
1180        spin_lock_init(&t->atid_lock);
1181
1182        /*
1183         * Setup the free lists for stid_tab and atid_tab.
1184         */
1185        if (nstids) {
1186                while (--nstids)
1187                        t->stid_tab[nstids - 1].next = &t->stid_tab[nstids];
1188                t->sfree = t->stid_tab;
1189        }
1190        if (natids) {
1191                while (--natids)
1192                        t->atid_tab[natids - 1].next = &t->atid_tab[natids];
1193                t->afree = t->atid_tab;
1194        }
1195        return 0;
1196}
1197
1198static void free_tid_maps(struct tid_info *t)
1199{
1200        kvfree(t->tid_tab);
1201}
1202
1203static inline void add_adapter(struct adapter *adap)
1204{
1205        write_lock_bh(&adapter_list_lock);
1206        list_add_tail(&adap->adapter_list, &adapter_list);
1207        write_unlock_bh(&adapter_list_lock);
1208}
1209
1210static inline void remove_adapter(struct adapter *adap)
1211{
1212        write_lock_bh(&adapter_list_lock);
1213        list_del(&adap->adapter_list);
1214        write_unlock_bh(&adapter_list_lock);
1215}
1216
1217int cxgb3_offload_activate(struct adapter *adapter)
1218{
1219        struct t3cdev *dev = &adapter->tdev;
1220        int natids, err;
1221        struct t3c_data *t;
1222        struct tid_range stid_range, tid_range;
1223        struct mtutab mtutab;
1224        unsigned int l2t_capacity;
1225        struct l2t_data *l2td;
1226
1227        t = kzalloc(sizeof(*t), GFP_KERNEL);
1228        if (!t)
1229                return -ENOMEM;
1230
1231        err = -EOPNOTSUPP;
1232        if (dev->ctl(dev, GET_TX_MAX_CHUNK, &t->tx_max_chunk) < 0 ||
1233            dev->ctl(dev, GET_MAX_OUTSTANDING_WR, &t->max_wrs) < 0 ||
1234            dev->ctl(dev, GET_L2T_CAPACITY, &l2t_capacity) < 0 ||
1235            dev->ctl(dev, GET_MTUS, &mtutab) < 0 ||
1236            dev->ctl(dev, GET_TID_RANGE, &tid_range) < 0 ||
1237            dev->ctl(dev, GET_STID_RANGE, &stid_range) < 0)
1238                goto out_free;
1239
1240        err = -ENOMEM;
1241        l2td = t3_init_l2t(l2t_capacity);
1242        if (!l2td)
1243                goto out_free;
1244
1245        natids = min(tid_range.num / 2, MAX_ATIDS);
1246        err = init_tid_tabs(&t->tid_maps, tid_range.num, natids,
1247                            stid_range.num, ATID_BASE, stid_range.base);
1248        if (err)
1249                goto out_free_l2t;
1250
1251        t->mtus = mtutab.mtus;
1252        t->nmtus = mtutab.size;
1253
1254        INIT_WORK(&t->tid_release_task, t3_process_tid_release_list);
1255        spin_lock_init(&t->tid_release_lock);
1256        INIT_LIST_HEAD(&t->list_node);
1257        t->dev = dev;
1258
1259        RCU_INIT_POINTER(dev->l2opt, l2td);
1260        T3C_DATA(dev) = t;
1261        dev->recv = process_rx;
1262        dev->neigh_update = t3_l2t_update;
1263
1264        /* Register netevent handler once */
1265        if (list_empty(&adapter_list))
1266                register_netevent_notifier(&nb);
1267
1268        t->nofail_skb = alloc_skb(sizeof(struct cpl_tid_release), GFP_KERNEL);
1269        t->release_list_incomplete = 0;
1270
1271        add_adapter(adapter);
1272        return 0;
1273
1274out_free_l2t:
1275        kvfree(l2td);
1276out_free:
1277        kfree(t);
1278        return err;
1279}
1280
1281static void clean_l2_data(struct rcu_head *head)
1282{
1283        struct l2t_data *d = container_of(head, struct l2t_data, rcu_head);
1284        kvfree(d);
1285}
1286
1287
1288void cxgb3_offload_deactivate(struct adapter *adapter)
1289{
1290        struct t3cdev *tdev = &adapter->tdev;
1291        struct t3c_data *t = T3C_DATA(tdev);
1292        struct l2t_data *d;
1293
1294        remove_adapter(adapter);
1295        if (list_empty(&adapter_list))
1296                unregister_netevent_notifier(&nb);
1297
1298        free_tid_maps(&t->tid_maps);
1299        T3C_DATA(tdev) = NULL;
1300        rcu_read_lock();
1301        d = L2DATA(tdev);
1302        rcu_read_unlock();
1303        RCU_INIT_POINTER(tdev->l2opt, NULL);
1304        call_rcu(&d->rcu_head, clean_l2_data);
1305        kfree_skb(t->nofail_skb);
1306        kfree(t);
1307}
1308
1309static inline void register_tdev(struct t3cdev *tdev)
1310{
1311        static int unit;
1312
1313        mutex_lock(&cxgb3_db_lock);
1314        snprintf(tdev->name, sizeof(tdev->name), "ofld_dev%d", unit++);
1315        list_add_tail(&tdev->ofld_dev_list, &ofld_dev_list);
1316        mutex_unlock(&cxgb3_db_lock);
1317}
1318
1319static inline void unregister_tdev(struct t3cdev *tdev)
1320{
1321        mutex_lock(&cxgb3_db_lock);
1322        list_del(&tdev->ofld_dev_list);
1323        mutex_unlock(&cxgb3_db_lock);
1324}
1325
1326static inline int adap2type(struct adapter *adapter)
1327{
1328        int type = 0;
1329
1330        switch (adapter->params.rev) {
1331        case T3_REV_A:
1332                type = T3A;
1333                break;
1334        case T3_REV_B:
1335        case T3_REV_B2:
1336                type = T3B;
1337                break;
1338        case T3_REV_C:
1339                type = T3C;
1340                break;
1341        }
1342        return type;
1343}
1344
1345void cxgb3_adapter_ofld(struct adapter *adapter)
1346{
1347        struct t3cdev *tdev = &adapter->tdev;
1348
1349        INIT_LIST_HEAD(&tdev->ofld_dev_list);
1350
1351        cxgb3_set_dummy_ops(tdev);
1352        tdev->send = t3_offload_tx;
1353        tdev->ctl = cxgb_offload_ctl;
1354        tdev->type = adap2type(adapter);
1355
1356        register_tdev(tdev);
1357}
1358
1359void cxgb3_adapter_unofld(struct adapter *adapter)
1360{
1361        struct t3cdev *tdev = &adapter->tdev;
1362
1363        tdev->recv = NULL;
1364        tdev->neigh_update = NULL;
1365
1366        unregister_tdev(tdev);
1367}
1368
1369void __init cxgb3_offload_init(void)
1370{
1371        int i;
1372
1373        for (i = 0; i < NUM_CPL_CMDS; ++i)
1374                cpl_handlers[i] = do_bad_cpl;
1375
1376        t3_register_cpl_handler(CPL_SMT_WRITE_RPL, do_smt_write_rpl);
1377        t3_register_cpl_handler(CPL_L2T_WRITE_RPL, do_l2t_write_rpl);
1378        t3_register_cpl_handler(CPL_RTE_WRITE_RPL, do_rte_write_rpl);
1379        t3_register_cpl_handler(CPL_PASS_OPEN_RPL, do_stid_rpl);
1380        t3_register_cpl_handler(CPL_CLOSE_LISTSRV_RPL, do_stid_rpl);
1381        t3_register_cpl_handler(CPL_PASS_ACCEPT_REQ, do_cr);
1382        t3_register_cpl_handler(CPL_PASS_ESTABLISH, do_hwtid_rpl);
1383        t3_register_cpl_handler(CPL_ABORT_RPL_RSS, do_hwtid_rpl);
1384        t3_register_cpl_handler(CPL_ABORT_RPL, do_hwtid_rpl);
1385        t3_register_cpl_handler(CPL_RX_URG_NOTIFY, do_hwtid_rpl);
1386        t3_register_cpl_handler(CPL_RX_DATA, do_hwtid_rpl);
1387        t3_register_cpl_handler(CPL_TX_DATA_ACK, do_hwtid_rpl);
1388        t3_register_cpl_handler(CPL_TX_DMA_ACK, do_hwtid_rpl);
1389        t3_register_cpl_handler(CPL_ACT_OPEN_RPL, do_act_open_rpl);
1390        t3_register_cpl_handler(CPL_PEER_CLOSE, do_hwtid_rpl);
1391        t3_register_cpl_handler(CPL_CLOSE_CON_RPL, do_hwtid_rpl);
1392        t3_register_cpl_handler(CPL_ABORT_REQ_RSS, do_abort_req_rss);
1393        t3_register_cpl_handler(CPL_ACT_ESTABLISH, do_act_establish);
1394        t3_register_cpl_handler(CPL_SET_TCB_RPL, do_hwtid_rpl);
1395        t3_register_cpl_handler(CPL_GET_TCB_RPL, do_hwtid_rpl);
1396        t3_register_cpl_handler(CPL_RDMA_TERMINATE, do_term);
1397        t3_register_cpl_handler(CPL_RDMA_EC_STATUS, do_hwtid_rpl);
1398        t3_register_cpl_handler(CPL_TRACE_PKT, do_trace);
1399        t3_register_cpl_handler(CPL_RX_DATA_DDP, do_hwtid_rpl);
1400        t3_register_cpl_handler(CPL_RX_DDP_COMPLETE, do_hwtid_rpl);
1401        t3_register_cpl_handler(CPL_ISCSI_HDR, do_hwtid_rpl);
1402}
1403