1048 lines · c
1/*2 * Copyright (c) 2004, 2005 Topspin Communications. All rights reserved.3 * Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved.4 * Copyright (c) 2004 Voltaire, Inc. All rights reserved.5 *6 * This software is available to you under a choice of one of two7 * licenses. You may choose to be licensed under the terms of the GNU8 * General Public License (GPL) Version 2, available from the file9 * COPYING in the main directory of this source tree, or the10 * OpenIB.org BSD license below:11 *12 * Redistribution and use in source and binary forms, with or13 * without modification, are permitted provided that the following14 * conditions are met:15 *16 * - Redistributions of source code must retain the above17 * copyright notice, this list of conditions and the following18 * disclaimer.19 *20 * - Redistributions in binary form must reproduce the above21 * copyright notice, this list of conditions and the following22 * disclaimer in the documentation and/or other materials23 * provided with the distribution.24 *25 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,26 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF27 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND28 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS29 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN30 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN31 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE32 * SOFTWARE.33 */34 35#include <linux/skbuff.h>36#include <linux/rtnetlink.h>37#include <linux/moduleparam.h>38#include <linux/ip.h>39#include <linux/in.h>40#include <linux/igmp.h>41#include <linux/inetdevice.h>42#include <linux/delay.h>43#include <linux/completion.h>44#include <linux/slab.h>45 46#include <net/dst.h>47 48#include "ipoib.h"49 50#ifdef CONFIG_INFINIBAND_IPOIB_DEBUG51static int mcast_debug_level;52 53module_param(mcast_debug_level, int, 0644);54MODULE_PARM_DESC(mcast_debug_level,55 "Enable multicast debug tracing if > 0");56#endif57 58struct ipoib_mcast_iter {59 struct net_device *dev;60 union ib_gid mgid;61 unsigned long created;62 unsigned int queuelen;63 unsigned int complete;64 unsigned int send_only;65};66 67/* join state that allows creating mcg with sendonly member request */68#define SENDONLY_FULLMEMBER_JOIN 869 70/*71 * This should be called with the priv->lock held72 */73static void __ipoib_mcast_schedule_join_thread(struct ipoib_dev_priv *priv,74 struct ipoib_mcast *mcast,75 bool delay)76{77 if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags))78 return;79 80 /*81 * We will be scheduling *something*, so cancel whatever is82 * currently scheduled first83 */84 cancel_delayed_work(&priv->mcast_task);85 if (mcast && delay) {86 /*87 * We had a failure and want to schedule a retry later88 */89 mcast->backoff *= 2;90 if (mcast->backoff > IPOIB_MAX_BACKOFF_SECONDS)91 mcast->backoff = IPOIB_MAX_BACKOFF_SECONDS;92 mcast->delay_until = jiffies + (mcast->backoff * HZ);93 /*94 * Mark this mcast for its delay, but restart the95 * task immediately. The join task will make sure to96 * clear out all entries without delays, and then97 * schedule itself to run again when the earliest98 * delay expires99 */100 queue_delayed_work(priv->wq, &priv->mcast_task, 0);101 } else if (delay) {102 /*103 * Special case of retrying after a failure to104 * allocate the broadcast multicast group, wait105 * 1 second and try again106 */107 queue_delayed_work(priv->wq, &priv->mcast_task, HZ);108 } else109 queue_delayed_work(priv->wq, &priv->mcast_task, 0);110}111 112static void ipoib_mcast_free(struct ipoib_mcast *mcast)113{114 struct net_device *dev = mcast->dev;115 int tx_dropped = 0;116 117 ipoib_dbg_mcast(ipoib_priv(dev), "deleting multicast group %pI6\n",118 mcast->mcmember.mgid.raw);119 120 /* remove all neigh connected to this mcast */121 ipoib_del_neighs_by_gid(dev, mcast->mcmember.mgid.raw);122 123 if (mcast->ah)124 ipoib_put_ah(mcast->ah);125 126 while (!skb_queue_empty(&mcast->pkt_queue)) {127 ++tx_dropped;128 dev_kfree_skb_any(skb_dequeue(&mcast->pkt_queue));129 }130 131 netif_tx_lock_bh(dev);132 dev->stats.tx_dropped += tx_dropped;133 netif_tx_unlock_bh(dev);134 135 kfree(mcast);136}137 138static struct ipoib_mcast *ipoib_mcast_alloc(struct net_device *dev)139{140 struct ipoib_mcast *mcast;141 142 mcast = kzalloc(sizeof(*mcast), GFP_ATOMIC);143 if (!mcast)144 return NULL;145 146 mcast->dev = dev;147 mcast->created = jiffies;148 mcast->delay_until = jiffies;149 mcast->backoff = 1;150 151 INIT_LIST_HEAD(&mcast->list);152 INIT_LIST_HEAD(&mcast->neigh_list);153 skb_queue_head_init(&mcast->pkt_queue);154 155 return mcast;156}157 158static struct ipoib_mcast *__ipoib_mcast_find(struct net_device *dev, void *mgid)159{160 struct ipoib_dev_priv *priv = ipoib_priv(dev);161 struct rb_node *n = priv->multicast_tree.rb_node;162 163 while (n) {164 struct ipoib_mcast *mcast;165 int ret;166 167 mcast = rb_entry(n, struct ipoib_mcast, rb_node);168 169 ret = memcmp(mgid, mcast->mcmember.mgid.raw,170 sizeof (union ib_gid));171 if (ret < 0)172 n = n->rb_left;173 else if (ret > 0)174 n = n->rb_right;175 else176 return mcast;177 }178 179 return NULL;180}181 182static int __ipoib_mcast_add(struct net_device *dev, struct ipoib_mcast *mcast)183{184 struct ipoib_dev_priv *priv = ipoib_priv(dev);185 struct rb_node **n = &priv->multicast_tree.rb_node, *pn = NULL;186 187 while (*n) {188 struct ipoib_mcast *tmcast;189 int ret;190 191 pn = *n;192 tmcast = rb_entry(pn, struct ipoib_mcast, rb_node);193 194 ret = memcmp(mcast->mcmember.mgid.raw, tmcast->mcmember.mgid.raw,195 sizeof (union ib_gid));196 if (ret < 0)197 n = &pn->rb_left;198 else if (ret > 0)199 n = &pn->rb_right;200 else201 return -EEXIST;202 }203 204 rb_link_node(&mcast->rb_node, pn, n);205 rb_insert_color(&mcast->rb_node, &priv->multicast_tree);206 207 return 0;208}209 210static int ipoib_mcast_join_finish(struct ipoib_mcast *mcast,211 struct ib_sa_mcmember_rec *mcmember)212{213 struct net_device *dev = mcast->dev;214 struct ipoib_dev_priv *priv = ipoib_priv(dev);215 struct rdma_netdev *rn = netdev_priv(dev);216 struct ipoib_ah *ah;217 struct rdma_ah_attr av;218 int ret;219 int set_qkey = 0;220 int mtu;221 222 mcast->mcmember = *mcmember;223 224 /* Set the multicast MTU and cached Q_Key before we attach if it's225 * the broadcast group.226 */227 if (!memcmp(mcast->mcmember.mgid.raw, priv->dev->broadcast + 4,228 sizeof (union ib_gid))) {229 spin_lock_irq(&priv->lock);230 if (!priv->broadcast) {231 spin_unlock_irq(&priv->lock);232 return -EAGAIN;233 }234 /*update priv member according to the new mcast*/235 priv->broadcast->mcmember.qkey = mcmember->qkey;236 priv->broadcast->mcmember.mtu = mcmember->mtu;237 priv->broadcast->mcmember.traffic_class = mcmember->traffic_class;238 priv->broadcast->mcmember.rate = mcmember->rate;239 priv->broadcast->mcmember.sl = mcmember->sl;240 priv->broadcast->mcmember.flow_label = mcmember->flow_label;241 priv->broadcast->mcmember.hop_limit = mcmember->hop_limit;242 /* assume if the admin and the mcast are the same both can be changed */243 mtu = rdma_mtu_enum_to_int(priv->ca, priv->port,244 priv->broadcast->mcmember.mtu);245 if (priv->mcast_mtu == priv->admin_mtu)246 priv->admin_mtu = IPOIB_UD_MTU(mtu);247 priv->mcast_mtu = IPOIB_UD_MTU(mtu);248 rn->mtu = priv->mcast_mtu;249 250 priv->qkey = be32_to_cpu(priv->broadcast->mcmember.qkey);251 spin_unlock_irq(&priv->lock);252 priv->tx_wr.remote_qkey = priv->qkey;253 set_qkey = 1;254 }255 256 if (!test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags)) {257 if (test_and_set_bit(IPOIB_MCAST_FLAG_ATTACHED, &mcast->flags)) {258 ipoib_warn(priv, "multicast group %pI6 already attached\n",259 mcast->mcmember.mgid.raw);260 261 return 0;262 }263 264 ret = rn->attach_mcast(dev, priv->ca, &mcast->mcmember.mgid,265 be16_to_cpu(mcast->mcmember.mlid),266 set_qkey, priv->qkey);267 if (ret < 0) {268 ipoib_warn(priv, "couldn't attach QP to multicast group %pI6\n",269 mcast->mcmember.mgid.raw);270 271 clear_bit(IPOIB_MCAST_FLAG_ATTACHED, &mcast->flags);272 return ret;273 }274 }275 276 memset(&av, 0, sizeof(av));277 av.type = rdma_ah_find_type(priv->ca, priv->port);278 rdma_ah_set_dlid(&av, be16_to_cpu(mcast->mcmember.mlid));279 rdma_ah_set_port_num(&av, priv->port);280 rdma_ah_set_sl(&av, mcast->mcmember.sl);281 rdma_ah_set_static_rate(&av, mcast->mcmember.rate);282 283 rdma_ah_set_grh(&av, &mcast->mcmember.mgid,284 be32_to_cpu(mcast->mcmember.flow_label),285 0, mcast->mcmember.hop_limit,286 mcast->mcmember.traffic_class);287 288 ah = ipoib_create_ah(dev, priv->pd, &av);289 if (IS_ERR(ah)) {290 ipoib_warn(priv, "ib_address_create failed %pe\n", ah);291 /* use original error */292 return PTR_ERR(ah);293 }294 spin_lock_irq(&priv->lock);295 mcast->ah = ah;296 spin_unlock_irq(&priv->lock);297 298 ipoib_dbg_mcast(priv, "MGID %pI6 AV %p, LID 0x%04x, SL %d\n",299 mcast->mcmember.mgid.raw,300 mcast->ah->ah,301 be16_to_cpu(mcast->mcmember.mlid),302 mcast->mcmember.sl);303 304 /* actually send any queued packets */305 netif_tx_lock_bh(dev);306 while (!skb_queue_empty(&mcast->pkt_queue)) {307 struct sk_buff *skb = skb_dequeue(&mcast->pkt_queue);308 309 netif_tx_unlock_bh(dev);310 311 skb->dev = dev;312 313 ret = dev_queue_xmit(skb);314 if (ret)315 ipoib_warn(priv, "%s:dev_queue_xmit failed to re-queue packet, ret:%d\n",316 __func__, ret);317 netif_tx_lock_bh(dev);318 }319 netif_tx_unlock_bh(dev);320 321 return 0;322}323 324void ipoib_mcast_carrier_on_task(struct work_struct *work)325{326 struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv,327 carrier_on_task);328 struct ib_port_attr attr;329 330 if (ib_query_port(priv->ca, priv->port, &attr) ||331 attr.state != IB_PORT_ACTIVE) {332 ipoib_dbg(priv, "Keeping carrier off until IB port is active\n");333 return;334 }335 /*336 * Take rtnl_lock to avoid racing with ipoib_stop() and337 * turning the carrier back on while a device is being338 * removed. However, ipoib_stop() will attempt to flush339 * the workqueue while holding the rtnl lock, so loop340 * on trylock until either we get the lock or we see341 * FLAG_OPER_UP go away as that signals that we are bailing342 * and can safely ignore the carrier on work.343 */344 while (!rtnl_trylock()) {345 if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags))346 return;347 else348 msleep(20);349 }350 if (!ipoib_cm_admin_enabled(priv->dev))351 dev_set_mtu(priv->dev, min(priv->mcast_mtu, priv->admin_mtu));352 netif_carrier_on(priv->dev);353 rtnl_unlock();354}355 356static int ipoib_mcast_join_complete(int status,357 struct ib_sa_multicast *multicast)358{359 struct ipoib_mcast *mcast = multicast->context;360 struct net_device *dev = mcast->dev;361 struct ipoib_dev_priv *priv = ipoib_priv(dev);362 363 ipoib_dbg_mcast(priv, "%sjoin completion for %pI6 (status %d)\n",364 test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags) ?365 "sendonly " : "",366 mcast->mcmember.mgid.raw, status);367 368 /* We trap for port events ourselves. */369 if (status == -ENETRESET) {370 status = 0;371 goto out;372 }373 374 if (!status)375 status = ipoib_mcast_join_finish(mcast, &multicast->rec);376 377 if (!status) {378 mcast->backoff = 1;379 mcast->delay_until = jiffies;380 381 /*382 * Defer carrier on work to priv->wq to avoid a383 * deadlock on rtnl_lock here. Requeue our multicast384 * work too, which will end up happening right after385 * our carrier on task work and will allow us to386 * send out all of the non-broadcast joins387 */388 if (mcast == priv->broadcast) {389 spin_lock_irq(&priv->lock);390 queue_work(priv->wq, &priv->carrier_on_task);391 __ipoib_mcast_schedule_join_thread(priv, NULL, 0);392 goto out_locked;393 }394 } else {395 bool silent_fail =396 test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags) &&397 status == -EINVAL;398 399 if (mcast->logcount < 20) {400 if (status == -ETIMEDOUT || status == -EAGAIN ||401 silent_fail) {402 ipoib_dbg_mcast(priv, "%smulticast join failed for %pI6, status %d\n",403 test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags) ? "sendonly " : "",404 mcast->mcmember.mgid.raw, status);405 } else {406 ipoib_warn(priv, "%smulticast join failed for %pI6, status %d\n",407 test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags) ? "sendonly " : "",408 mcast->mcmember.mgid.raw, status);409 }410 411 if (!silent_fail)412 mcast->logcount++;413 }414 415 if (test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags) &&416 mcast->backoff >= 2) {417 /*418 * We only retry sendonly joins once before we drop419 * the packet and quit trying to deal with the420 * group. However, we leave the group in the421 * mcast list as an unjoined group. If we want to422 * try joining again, we simply queue up a packet423 * and restart the join thread. The empty queue424 * is why the join thread ignores this group.425 */426 mcast->backoff = 1;427 netif_tx_lock_bh(dev);428 while (!skb_queue_empty(&mcast->pkt_queue)) {429 ++dev->stats.tx_dropped;430 dev_kfree_skb_any(skb_dequeue(&mcast->pkt_queue));431 }432 netif_tx_unlock_bh(dev);433 } else {434 spin_lock_irq(&priv->lock);435 /* Requeue this join task with a backoff delay */436 __ipoib_mcast_schedule_join_thread(priv, mcast, 1);437 goto out_locked;438 }439 }440out:441 spin_lock_irq(&priv->lock);442out_locked:443 /*444 * Make sure to set mcast->mc before we clear the busy flag to avoid445 * racing with code that checks for BUSY before checking mcast->mc446 */447 if (status)448 mcast->mc = NULL;449 else450 mcast->mc = multicast;451 clear_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags);452 spin_unlock_irq(&priv->lock);453 complete(&mcast->done);454 455 return status;456}457 458/*459 * Caller must hold 'priv->lock'460 */461static int ipoib_mcast_join(struct net_device *dev, struct ipoib_mcast *mcast)462{463 struct ipoib_dev_priv *priv = ipoib_priv(dev);464 struct ib_sa_multicast *multicast;465 struct ib_sa_mcmember_rec rec = {466 .join_state = 1467 };468 ib_sa_comp_mask comp_mask;469 int ret = 0;470 471 if (!priv->broadcast ||472 !test_bit(IPOIB_FLAG_OPER_UP, &priv->flags))473 return -EINVAL;474 475 init_completion(&mcast->done);476 set_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags);477 478 ipoib_dbg_mcast(priv, "joining MGID %pI6\n", mcast->mcmember.mgid.raw);479 480 rec.mgid = mcast->mcmember.mgid;481 rec.port_gid = priv->local_gid;482 rec.pkey = cpu_to_be16(priv->pkey);483 484 comp_mask =485 IB_SA_MCMEMBER_REC_MGID |486 IB_SA_MCMEMBER_REC_PORT_GID |487 IB_SA_MCMEMBER_REC_PKEY |488 IB_SA_MCMEMBER_REC_JOIN_STATE;489 490 if (mcast != priv->broadcast) {491 /*492 * RFC 4391:493 * The MGID MUST use the same P_Key, Q_Key, SL, MTU,494 * and HopLimit as those used in the broadcast-GID. The rest495 * of attributes SHOULD follow the values used in the496 * broadcast-GID as well.497 */498 comp_mask |=499 IB_SA_MCMEMBER_REC_QKEY |500 IB_SA_MCMEMBER_REC_MTU_SELECTOR |501 IB_SA_MCMEMBER_REC_MTU |502 IB_SA_MCMEMBER_REC_TRAFFIC_CLASS |503 IB_SA_MCMEMBER_REC_RATE_SELECTOR |504 IB_SA_MCMEMBER_REC_RATE |505 IB_SA_MCMEMBER_REC_SL |506 IB_SA_MCMEMBER_REC_FLOW_LABEL |507 IB_SA_MCMEMBER_REC_HOP_LIMIT;508 509 rec.qkey = priv->broadcast->mcmember.qkey;510 rec.mtu_selector = IB_SA_EQ;511 rec.mtu = priv->broadcast->mcmember.mtu;512 rec.traffic_class = priv->broadcast->mcmember.traffic_class;513 rec.rate_selector = IB_SA_EQ;514 rec.rate = priv->broadcast->mcmember.rate;515 rec.sl = priv->broadcast->mcmember.sl;516 rec.flow_label = priv->broadcast->mcmember.flow_label;517 rec.hop_limit = priv->broadcast->mcmember.hop_limit;518 519 /*520 * Send-only IB Multicast joins work at the core IB layer but521 * require specific SM support.522 * We can use such joins here only if the current SM supports that feature.523 * However, if not, we emulate an Ethernet multicast send,524 * which does not require a multicast subscription and will525 * still send properly. The most appropriate thing to526 * do is to create the group if it doesn't exist as that527 * most closely emulates the behavior, from a user space528 * application perspective, of Ethernet multicast operation.529 */530 if (test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags))531 rec.join_state = SENDONLY_FULLMEMBER_JOIN;532 }533 534 multicast = ib_sa_join_multicast(&ipoib_sa_client, priv->ca, priv->port,535 &rec, comp_mask, GFP_ATOMIC,536 ipoib_mcast_join_complete, mcast);537 if (IS_ERR(multicast)) {538 ret = PTR_ERR(multicast);539 ipoib_warn(priv, "ib_sa_join_multicast failed, status %d\n", ret);540 /* Requeue this join task with a backoff delay */541 __ipoib_mcast_schedule_join_thread(priv, mcast, 1);542 clear_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags);543 complete(&mcast->done);544 return ret;545 }546 return 0;547}548 549void ipoib_mcast_join_task(struct work_struct *work)550{551 struct ipoib_dev_priv *priv =552 container_of(work, struct ipoib_dev_priv, mcast_task.work);553 struct net_device *dev = priv->dev;554 struct ib_port_attr port_attr;555 unsigned long delay_until = 0;556 struct ipoib_mcast *mcast = NULL;557 558 if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags))559 return;560 561 if (ib_query_port(priv->ca, priv->port, &port_attr)) {562 ipoib_dbg(priv, "ib_query_port() failed\n");563 return;564 }565 if (port_attr.state != IB_PORT_ACTIVE) {566 ipoib_dbg(priv, "port state is not ACTIVE (state = %d) suspending join task\n",567 port_attr.state);568 return;569 }570 priv->local_lid = port_attr.lid;571 netif_addr_lock_bh(dev);572 573 if (!test_bit(IPOIB_FLAG_DEV_ADDR_SET, &priv->flags)) {574 netif_addr_unlock_bh(dev);575 return;576 }577 netif_addr_unlock_bh(dev);578 579 spin_lock_irq(&priv->lock);580 if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags))581 goto out;582 583 if (!priv->broadcast) {584 struct ipoib_mcast *broadcast;585 586 broadcast = ipoib_mcast_alloc(dev);587 if (!broadcast) {588 ipoib_warn(priv, "failed to allocate broadcast group\n");589 /*590 * Restart us after a 1 second delay to retry591 * creating our broadcast group and attaching to592 * it. Until this succeeds, this ipoib dev is593 * completely stalled (multicast wise).594 */595 __ipoib_mcast_schedule_join_thread(priv, NULL, 1);596 goto out;597 }598 599 memcpy(broadcast->mcmember.mgid.raw, priv->dev->broadcast + 4,600 sizeof (union ib_gid));601 priv->broadcast = broadcast;602 603 __ipoib_mcast_add(dev, priv->broadcast);604 }605 606 if (!test_bit(IPOIB_MCAST_FLAG_ATTACHED, &priv->broadcast->flags)) {607 if (IS_ERR_OR_NULL(priv->broadcast->mc) &&608 !test_bit(IPOIB_MCAST_FLAG_BUSY, &priv->broadcast->flags)) {609 mcast = priv->broadcast;610 if (mcast->backoff > 1 &&611 time_before(jiffies, mcast->delay_until)) {612 delay_until = mcast->delay_until;613 mcast = NULL;614 }615 }616 goto out;617 }618 619 /*620 * We'll never get here until the broadcast group is both allocated621 * and attached622 */623 list_for_each_entry(mcast, &priv->multicast_list, list) {624 if (IS_ERR_OR_NULL(mcast->mc) &&625 !test_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags) &&626 (!test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags) ||627 !skb_queue_empty(&mcast->pkt_queue))) {628 if (mcast->backoff == 1 ||629 time_after_eq(jiffies, mcast->delay_until)) {630 /* Found the next unjoined group */631 if (ipoib_mcast_join(dev, mcast)) {632 spin_unlock_irq(&priv->lock);633 return;634 }635 } else if (!delay_until ||636 time_before(mcast->delay_until, delay_until))637 delay_until = mcast->delay_until;638 }639 }640 641 mcast = NULL;642 ipoib_dbg_mcast(priv, "successfully started all multicast joins\n");643 644out:645 if (delay_until) {646 cancel_delayed_work(&priv->mcast_task);647 queue_delayed_work(priv->wq, &priv->mcast_task,648 delay_until - jiffies);649 }650 if (mcast)651 ipoib_mcast_join(dev, mcast);652 653 spin_unlock_irq(&priv->lock);654}655 656void ipoib_mcast_start_thread(struct net_device *dev)657{658 struct ipoib_dev_priv *priv = ipoib_priv(dev);659 unsigned long flags;660 661 ipoib_dbg_mcast(priv, "starting multicast thread\n");662 663 spin_lock_irqsave(&priv->lock, flags);664 __ipoib_mcast_schedule_join_thread(priv, NULL, 0);665 spin_unlock_irqrestore(&priv->lock, flags);666}667 668void ipoib_mcast_stop_thread(struct net_device *dev)669{670 struct ipoib_dev_priv *priv = ipoib_priv(dev);671 672 ipoib_dbg_mcast(priv, "stopping multicast thread\n");673 674 cancel_delayed_work_sync(&priv->mcast_task);675}676 677static int ipoib_mcast_leave(struct net_device *dev, struct ipoib_mcast *mcast)678{679 struct ipoib_dev_priv *priv = ipoib_priv(dev);680 struct rdma_netdev *rn = netdev_priv(dev);681 int ret = 0;682 683 if (test_and_clear_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags))684 ipoib_warn(priv, "ipoib_mcast_leave on an in-flight join\n");685 686 if (!IS_ERR_OR_NULL(mcast->mc))687 ib_sa_free_multicast(mcast->mc);688 689 if (test_and_clear_bit(IPOIB_MCAST_FLAG_ATTACHED, &mcast->flags)) {690 ipoib_dbg_mcast(priv, "leaving MGID %pI6\n",691 mcast->mcmember.mgid.raw);692 693 /* Remove ourselves from the multicast group */694 ret = rn->detach_mcast(dev, priv->ca, &mcast->mcmember.mgid,695 be16_to_cpu(mcast->mcmember.mlid));696 if (ret)697 ipoib_warn(priv, "ib_detach_mcast failed (result = %d)\n", ret);698 } else if (!test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags))699 ipoib_dbg(priv, "leaving with no mcmember but not a "700 "SENDONLY join\n");701 702 return 0;703}704 705/*706 * Check if the multicast group is sendonly. If so remove it from the maps707 * and add to the remove list708 */709void ipoib_check_and_add_mcast_sendonly(struct ipoib_dev_priv *priv, u8 *mgid,710 struct list_head *remove_list)711{712 /* Is this multicast ? */713 if (*mgid == 0xff) {714 struct ipoib_mcast *mcast = __ipoib_mcast_find(priv->dev, mgid);715 716 if (mcast && test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags)) {717 list_del(&mcast->list);718 rb_erase(&mcast->rb_node, &priv->multicast_tree);719 list_add_tail(&mcast->list, remove_list);720 }721 }722}723 724void ipoib_mcast_remove_list(struct list_head *remove_list)725{726 struct ipoib_mcast *mcast, *tmcast;727 728 /*729 * make sure the in-flight joins have finished before we attempt730 * to leave731 */732 list_for_each_entry_safe(mcast, tmcast, remove_list, list)733 if (test_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags))734 wait_for_completion(&mcast->done);735 736 list_for_each_entry_safe(mcast, tmcast, remove_list, list) {737 ipoib_mcast_leave(mcast->dev, mcast);738 ipoib_mcast_free(mcast);739 }740}741 742void ipoib_mcast_send(struct net_device *dev, u8 *daddr, struct sk_buff *skb)743{744 struct ipoib_dev_priv *priv = ipoib_priv(dev);745 struct rdma_netdev *rn = netdev_priv(dev);746 struct ipoib_mcast *mcast;747 unsigned long flags;748 void *mgid = daddr + 4;749 750 spin_lock_irqsave(&priv->lock, flags);751 752 if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags) ||753 !priv->broadcast ||754 !test_bit(IPOIB_MCAST_FLAG_ATTACHED, &priv->broadcast->flags)) {755 ++dev->stats.tx_dropped;756 dev_kfree_skb_any(skb);757 goto unlock;758 }759 760 mcast = __ipoib_mcast_find(dev, mgid);761 if (!mcast || !mcast->ah) {762 if (!mcast) {763 /* Let's create a new send only group now */764 ipoib_dbg_mcast(priv, "setting up send only multicast group for %pI6\n",765 mgid);766 767 mcast = ipoib_mcast_alloc(dev);768 if (!mcast) {769 ipoib_warn(priv, "unable to allocate memory "770 "for multicast structure\n");771 ++dev->stats.tx_dropped;772 dev_kfree_skb_any(skb);773 goto unlock;774 }775 776 set_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags);777 memcpy(mcast->mcmember.mgid.raw, mgid,778 sizeof (union ib_gid));779 __ipoib_mcast_add(dev, mcast);780 list_add_tail(&mcast->list, &priv->multicast_list);781 }782 if (skb_queue_len(&mcast->pkt_queue) < IPOIB_MAX_MCAST_QUEUE) {783 /* put pseudoheader back on for next time */784 skb_push(skb, sizeof(struct ipoib_pseudo_header));785 skb_queue_tail(&mcast->pkt_queue, skb);786 } else {787 ++dev->stats.tx_dropped;788 dev_kfree_skb_any(skb);789 }790 if (!test_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags)) {791 __ipoib_mcast_schedule_join_thread(priv, NULL, 0);792 }793 } else {794 struct ipoib_neigh *neigh;795 796 spin_unlock_irqrestore(&priv->lock, flags);797 neigh = ipoib_neigh_get(dev, daddr);798 spin_lock_irqsave(&priv->lock, flags);799 if (!neigh) {800 neigh = ipoib_neigh_alloc(daddr, dev);801 /* Make sure that the neigh will be added only802 * once to mcast list.803 */804 if (neigh && list_empty(&neigh->list)) {805 kref_get(&mcast->ah->ref);806 neigh->ah = mcast->ah;807 neigh->ah->valid = 1;808 list_add_tail(&neigh->list, &mcast->neigh_list);809 }810 }811 spin_unlock_irqrestore(&priv->lock, flags);812 mcast->ah->last_send = rn->send(dev, skb, mcast->ah->ah,813 IB_MULTICAST_QPN);814 if (neigh)815 ipoib_neigh_put(neigh);816 return;817 }818 819unlock:820 spin_unlock_irqrestore(&priv->lock, flags);821}822 823void ipoib_mcast_dev_flush(struct net_device *dev)824{825 struct ipoib_dev_priv *priv = ipoib_priv(dev);826 LIST_HEAD(remove_list);827 struct ipoib_mcast *mcast, *tmcast;828 unsigned long flags;829 830 mutex_lock(&priv->mcast_mutex);831 ipoib_dbg_mcast(priv, "flushing multicast list\n");832 833 spin_lock_irqsave(&priv->lock, flags);834 835 list_for_each_entry_safe(mcast, tmcast, &priv->multicast_list, list) {836 list_del(&mcast->list);837 rb_erase(&mcast->rb_node, &priv->multicast_tree);838 list_add_tail(&mcast->list, &remove_list);839 }840 841 if (priv->broadcast) {842 rb_erase(&priv->broadcast->rb_node, &priv->multicast_tree);843 list_add_tail(&priv->broadcast->list, &remove_list);844 priv->broadcast = NULL;845 }846 847 spin_unlock_irqrestore(&priv->lock, flags);848 849 ipoib_mcast_remove_list(&remove_list);850 mutex_unlock(&priv->mcast_mutex);851}852 853static int ipoib_mcast_addr_is_valid(const u8 *addr, const u8 *broadcast)854{855 /* reserved QPN, prefix, scope */856 if (memcmp(addr, broadcast, 6))857 return 0;858 /* signature lower, pkey */859 if (memcmp(addr + 7, broadcast + 7, 3))860 return 0;861 return 1;862}863 864void ipoib_mcast_restart_task(struct work_struct *work)865{866 struct ipoib_dev_priv *priv =867 container_of(work, struct ipoib_dev_priv, restart_task);868 struct net_device *dev = priv->dev;869 struct netdev_hw_addr *ha;870 struct ipoib_mcast *mcast, *tmcast;871 LIST_HEAD(remove_list);872 struct ib_sa_mcmember_rec rec;873 874 if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags))875 /*876 * shortcut...on shutdown flush is called next, just877 * let it do all the work878 */879 return;880 881 ipoib_dbg_mcast(priv, "restarting multicast task\n");882 883 netif_addr_lock_bh(dev);884 spin_lock_irq(&priv->lock);885 886 /*887 * Unfortunately, the networking core only gives us a list of all of888 * the multicast hardware addresses. We need to figure out which ones889 * are new and which ones have been removed890 */891 892 /* Clear out the found flag */893 list_for_each_entry(mcast, &priv->multicast_list, list)894 clear_bit(IPOIB_MCAST_FLAG_FOUND, &mcast->flags);895 896 /* Mark all of the entries that are found or don't exist */897 netdev_for_each_mc_addr(ha, dev) {898 union ib_gid mgid;899 900 if (!ipoib_mcast_addr_is_valid(ha->addr, dev->broadcast))901 continue;902 903 memcpy(mgid.raw, ha->addr + 4, sizeof(mgid));904 905 mcast = __ipoib_mcast_find(dev, &mgid);906 if (!mcast || test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags)) {907 struct ipoib_mcast *nmcast;908 909 /* ignore group which is directly joined by userspace */910 if (test_bit(IPOIB_FLAG_UMCAST, &priv->flags) &&911 !ib_sa_get_mcmember_rec(priv->ca, priv->port, &mgid, &rec)) {912 ipoib_dbg_mcast(priv, "ignoring multicast entry for mgid %pI6\n",913 mgid.raw);914 continue;915 }916 917 /* Not found or send-only group, let's add a new entry */918 ipoib_dbg_mcast(priv, "adding multicast entry for mgid %pI6\n",919 mgid.raw);920 921 nmcast = ipoib_mcast_alloc(dev);922 if (!nmcast) {923 ipoib_warn(priv, "unable to allocate memory for multicast structure\n");924 continue;925 }926 927 set_bit(IPOIB_MCAST_FLAG_FOUND, &nmcast->flags);928 929 nmcast->mcmember.mgid = mgid;930 931 if (mcast) {932 /* Destroy the send only entry */933 list_move_tail(&mcast->list, &remove_list);934 935 rb_replace_node(&mcast->rb_node,936 &nmcast->rb_node,937 &priv->multicast_tree);938 } else939 __ipoib_mcast_add(dev, nmcast);940 941 list_add_tail(&nmcast->list, &priv->multicast_list);942 }943 944 if (mcast)945 set_bit(IPOIB_MCAST_FLAG_FOUND, &mcast->flags);946 }947 948 /* Remove all of the entries don't exist anymore */949 list_for_each_entry_safe(mcast, tmcast, &priv->multicast_list, list) {950 if (!test_bit(IPOIB_MCAST_FLAG_FOUND, &mcast->flags) &&951 !test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags)) {952 ipoib_dbg_mcast(priv, "deleting multicast group %pI6\n",953 mcast->mcmember.mgid.raw);954 955 rb_erase(&mcast->rb_node, &priv->multicast_tree);956 957 /* Move to the remove list */958 list_move_tail(&mcast->list, &remove_list);959 }960 }961 962 spin_unlock_irq(&priv->lock);963 netif_addr_unlock_bh(dev);964 965 ipoib_mcast_remove_list(&remove_list);966 967 /*968 * Double check that we are still up969 */970 if (test_bit(IPOIB_FLAG_OPER_UP, &priv->flags)) {971 spin_lock_irq(&priv->lock);972 __ipoib_mcast_schedule_join_thread(priv, NULL, 0);973 spin_unlock_irq(&priv->lock);974 }975}976 977#ifdef CONFIG_INFINIBAND_IPOIB_DEBUG978 979struct ipoib_mcast_iter *ipoib_mcast_iter_init(struct net_device *dev)980{981 struct ipoib_mcast_iter *iter;982 983 iter = kmalloc(sizeof(*iter), GFP_KERNEL);984 if (!iter)985 return NULL;986 987 iter->dev = dev;988 memset(iter->mgid.raw, 0, 16);989 990 if (ipoib_mcast_iter_next(iter)) {991 kfree(iter);992 return NULL;993 }994 995 return iter;996}997 998int ipoib_mcast_iter_next(struct ipoib_mcast_iter *iter)999{1000 struct ipoib_dev_priv *priv = ipoib_priv(iter->dev);1001 struct rb_node *n;1002 struct ipoib_mcast *mcast;1003 int ret = 1;1004 1005 spin_lock_irq(&priv->lock);1006 1007 n = rb_first(&priv->multicast_tree);1008 1009 while (n) {1010 mcast = rb_entry(n, struct ipoib_mcast, rb_node);1011 1012 if (memcmp(iter->mgid.raw, mcast->mcmember.mgid.raw,1013 sizeof (union ib_gid)) < 0) {1014 iter->mgid = mcast->mcmember.mgid;1015 iter->created = mcast->created;1016 iter->queuelen = skb_queue_len(&mcast->pkt_queue);1017 iter->complete = !!mcast->ah;1018 iter->send_only = !!(mcast->flags & (1 << IPOIB_MCAST_FLAG_SENDONLY));1019 1020 ret = 0;1021 1022 break;1023 }1024 1025 n = rb_next(n);1026 }1027 1028 spin_unlock_irq(&priv->lock);1029 1030 return ret;1031}1032 1033void ipoib_mcast_iter_read(struct ipoib_mcast_iter *iter,1034 union ib_gid *mgid,1035 unsigned long *created,1036 unsigned int *queuelen,1037 unsigned int *complete,1038 unsigned int *send_only)1039{1040 *mgid = iter->mgid;1041 *created = iter->created;1042 *queuelen = iter->queuelen;1043 *complete = iter->complete;1044 *send_only = iter->send_only;1045}1046 1047#endif /* CONFIG_INFINIBAND_IPOIB_DEBUG */1048