| /* |
| * Copyright (c) 2004, 2005 Topspin Communications. All rights reserved. |
| * Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved. |
| * Copyright (c) 2004 Voltaire, Inc. All rights reserved. |
| * |
| * This software is available to you under a choice of one of two |
| * licenses. You may choose to be licensed under the terms of the GNU |
| * General Public License (GPL) Version 2, available from the file |
| * COPYING in the main directory of this source tree, or the |
| * OpenIB.org BSD license below: |
| * |
| * Redistribution and use in source and binary forms, with or |
| * without modification, are permitted provided that the following |
| * conditions are met: |
| * |
| * - Redistributions of source code must retain the above |
| * copyright notice, this list of conditions and the following |
| * disclaimer. |
| * |
| * - Redistributions in binary form must reproduce the above |
| * copyright notice, this list of conditions and the following |
| * disclaimer in the documentation and/or other materials |
| * provided with the distribution. |
| * |
| * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, |
| * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF |
| * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND |
| * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS |
| * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN |
| * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN |
| * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE |
| * SOFTWARE. |
| */ |
| |
| #include <linux/skbuff.h> |
| #include <linux/rtnetlink.h> |
| #include <linux/moduleparam.h> |
| #include <linux/ip.h> |
| #include <linux/in.h> |
| #include <linux/igmp.h> |
| #include <linux/inetdevice.h> |
| #include <linux/delay.h> |
| #include <linux/completion.h> |
| #include <linux/slab.h> |
| |
| #include <net/dst.h> |
| |
| #include "ipoib.h" |
| |
| #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG |
| static int mcast_debug_level; |
| |
| module_param(mcast_debug_level, int, 0644); |
| MODULE_PARM_DESC(mcast_debug_level, |
| "Enable multicast debug tracing if > 0"); |
| #endif |
| |
| struct ipoib_mcast_iter { |
| struct net_device *dev; |
| union ib_gid mgid; |
| unsigned long created; |
| unsigned int queuelen; |
| unsigned int complete; |
| unsigned int send_only; |
| }; |
| |
| /* join state that allows creating mcg with sendonly member request */ |
| #define SENDONLY_FULLMEMBER_JOIN 8 |
| |
| /* |
| * This should be called with the priv->lock held |
| */ |
| static void __ipoib_mcast_schedule_join_thread(struct ipoib_dev_priv *priv, |
| struct ipoib_mcast *mcast, |
| bool delay) |
| { |
| if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags)) |
| return; |
| |
| /* |
| * We will be scheduling *something*, so cancel whatever is |
| * currently scheduled first |
| */ |
| cancel_delayed_work(&priv->mcast_task); |
| if (mcast && delay) { |
| /* |
| * We had a failure and want to schedule a retry later |
| */ |
| mcast->backoff *= 2; |
| if (mcast->backoff > IPOIB_MAX_BACKOFF_SECONDS) |
| mcast->backoff = IPOIB_MAX_BACKOFF_SECONDS; |
| mcast->delay_until = jiffies + (mcast->backoff * HZ); |
| /* |
| * Mark this mcast for its delay, but restart the |
| * task immediately. The join task will make sure to |
| * clear out all entries without delays, and then |
| * schedule itself to run again when the earliest |
| * delay expires |
| */ |
| queue_delayed_work(priv->wq, &priv->mcast_task, 0); |
| } else if (delay) { |
| /* |
| * Special case of retrying after a failure to |
| * allocate the broadcast multicast group, wait |
| * 1 second and try again |
| */ |
| queue_delayed_work(priv->wq, &priv->mcast_task, HZ); |
| } else |
| queue_delayed_work(priv->wq, &priv->mcast_task, 0); |
| } |
| |
| static void ipoib_mcast_free(struct ipoib_mcast *mcast) |
| { |
| struct net_device *dev = mcast->dev; |
| int tx_dropped = 0; |
| |
| ipoib_dbg_mcast(ipoib_priv(dev), "deleting multicast group %pI6\n", |
| mcast->mcmember.mgid.raw); |
| |
| /* remove all neigh connected to this mcast */ |
| ipoib_del_neighs_by_gid(dev, mcast->mcmember.mgid.raw); |
| |
| if (mcast->ah) |
| ipoib_put_ah(mcast->ah); |
| |
| while (!skb_queue_empty(&mcast->pkt_queue)) { |
| ++tx_dropped; |
| dev_kfree_skb_any(skb_dequeue(&mcast->pkt_queue)); |
| } |
| |
| netif_tx_lock_bh(dev); |
| dev->stats.tx_dropped += tx_dropped; |
| netif_tx_unlock_bh(dev); |
| |
| kfree(mcast); |
| } |
| |
| static struct ipoib_mcast *ipoib_mcast_alloc(struct net_device *dev, |
| int can_sleep) |
| { |
| struct ipoib_mcast *mcast; |
| |
| mcast = kzalloc(sizeof(*mcast), can_sleep ? GFP_KERNEL : GFP_ATOMIC); |
| if (!mcast) |
| return NULL; |
| |
| mcast->dev = dev; |
| mcast->created = jiffies; |
| mcast->delay_until = jiffies; |
| mcast->backoff = 1; |
| |
| INIT_LIST_HEAD(&mcast->list); |
| INIT_LIST_HEAD(&mcast->neigh_list); |
| skb_queue_head_init(&mcast->pkt_queue); |
| |
| return mcast; |
| } |
| |
| static struct ipoib_mcast *__ipoib_mcast_find(struct net_device *dev, void *mgid) |
| { |
| struct ipoib_dev_priv *priv = ipoib_priv(dev); |
| struct rb_node *n = priv->multicast_tree.rb_node; |
| |
| while (n) { |
| struct ipoib_mcast *mcast; |
| int ret; |
| |
| mcast = rb_entry(n, struct ipoib_mcast, rb_node); |
| |
| ret = memcmp(mgid, mcast->mcmember.mgid.raw, |
| sizeof (union ib_gid)); |
| if (ret < 0) |
| n = n->rb_left; |
| else if (ret > 0) |
| n = n->rb_right; |
| else |
| return mcast; |
| } |
| |
| return NULL; |
| } |
| |
| static int __ipoib_mcast_add(struct net_device *dev, struct ipoib_mcast *mcast) |
| { |
| struct ipoib_dev_priv *priv = ipoib_priv(dev); |
| struct rb_node **n = &priv->multicast_tree.rb_node, *pn = NULL; |
| |
| while (*n) { |
| struct ipoib_mcast *tmcast; |
| int ret; |
| |
| pn = *n; |
| tmcast = rb_entry(pn, struct ipoib_mcast, rb_node); |
| |
| ret = memcmp(mcast->mcmember.mgid.raw, tmcast->mcmember.mgid.raw, |
| sizeof (union ib_gid)); |
| if (ret < 0) |
| n = &pn->rb_left; |
| else if (ret > 0) |
| n = &pn->rb_right; |
| else |
| return -EEXIST; |
| } |
| |
| rb_link_node(&mcast->rb_node, pn, n); |
| rb_insert_color(&mcast->rb_node, &priv->multicast_tree); |
| |
| return 0; |
| } |
| |
| static int ipoib_mcast_join_finish(struct ipoib_mcast *mcast, |
| struct ib_sa_mcmember_rec *mcmember) |
| { |
| struct net_device *dev = mcast->dev; |
| struct ipoib_dev_priv *priv = ipoib_priv(dev); |
| struct rdma_netdev *rn = netdev_priv(dev); |
| struct ipoib_ah *ah; |
| struct rdma_ah_attr av; |
| int ret; |
| int set_qkey = 0; |
| |
| mcast->mcmember = *mcmember; |
| |
| /* Set the multicast MTU and cached Q_Key before we attach if it's |
| * the broadcast group. |
| */ |
| if (!memcmp(mcast->mcmember.mgid.raw, priv->dev->broadcast + 4, |
| sizeof (union ib_gid))) { |
| spin_lock_irq(&priv->lock); |
| if (!priv->broadcast) { |
| spin_unlock_irq(&priv->lock); |
| return -EAGAIN; |
| } |
| /*update priv member according to the new mcast*/ |
| priv->broadcast->mcmember.qkey = mcmember->qkey; |
| priv->broadcast->mcmember.mtu = mcmember->mtu; |
| priv->broadcast->mcmember.traffic_class = mcmember->traffic_class; |
| priv->broadcast->mcmember.rate = mcmember->rate; |
| priv->broadcast->mcmember.sl = mcmember->sl; |
| priv->broadcast->mcmember.flow_label = mcmember->flow_label; |
| priv->broadcast->mcmember.hop_limit = mcmember->hop_limit; |
| /* assume if the admin and the mcast are the same both can be changed */ |
| if (priv->mcast_mtu == priv->admin_mtu) |
| priv->admin_mtu = |
| priv->mcast_mtu = |
| IPOIB_UD_MTU(ib_mtu_enum_to_int(priv->broadcast->mcmember.mtu)); |
| else |
| priv->mcast_mtu = |
| IPOIB_UD_MTU(ib_mtu_enum_to_int(priv->broadcast->mcmember.mtu)); |
| |
| priv->qkey = be32_to_cpu(priv->broadcast->mcmember.qkey); |
| spin_unlock_irq(&priv->lock); |
| priv->tx_wr.remote_qkey = priv->qkey; |
| set_qkey = 1; |
| } |
| |
| if (!test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags)) { |
| if (test_and_set_bit(IPOIB_MCAST_FLAG_ATTACHED, &mcast->flags)) { |
| ipoib_warn(priv, "multicast group %pI6 already attached\n", |
| mcast->mcmember.mgid.raw); |
| |
| return 0; |
| } |
| |
| ret = rn->attach_mcast(dev, priv->ca, &mcast->mcmember.mgid, |
| be16_to_cpu(mcast->mcmember.mlid), |
| set_qkey, priv->qkey); |
| if (ret < 0) { |
| ipoib_warn(priv, "couldn't attach QP to multicast group %pI6\n", |
| mcast->mcmember.mgid.raw); |
| |
| clear_bit(IPOIB_MCAST_FLAG_ATTACHED, &mcast->flags); |
| return ret; |
| } |
| } |
| |
| memset(&av, 0, sizeof(av)); |
| av.type = rdma_ah_find_type(priv->ca, priv->port); |
| rdma_ah_set_dlid(&av, be16_to_cpu(mcast->mcmember.mlid)), |
| rdma_ah_set_port_num(&av, priv->port); |
| rdma_ah_set_sl(&av, mcast->mcmember.sl); |
| rdma_ah_set_static_rate(&av, mcast->mcmember.rate); |
| |
| rdma_ah_set_grh(&av, &mcast->mcmember.mgid, |
| be32_to_cpu(mcast->mcmember.flow_label), |
| 0, mcast->mcmember.hop_limit, |
| mcast->mcmember.traffic_class); |
| |
| ah = ipoib_create_ah(dev, priv->pd, &av); |
| if (IS_ERR(ah)) { |
| ipoib_warn(priv, "ib_address_create failed %ld\n", |
| -PTR_ERR(ah)); |
| /* use original error */ |
| return PTR_ERR(ah); |
| } |
| spin_lock_irq(&priv->lock); |
| mcast->ah = ah; |
| spin_unlock_irq(&priv->lock); |
| |
| ipoib_dbg_mcast(priv, "MGID %pI6 AV %p, LID 0x%04x, SL %d\n", |
| mcast->mcmember.mgid.raw, |
| mcast->ah->ah, |
| be16_to_cpu(mcast->mcmember.mlid), |
| mcast->mcmember.sl); |
| |
| /* actually send any queued packets */ |
| netif_tx_lock_bh(dev); |
| while (!skb_queue_empty(&mcast->pkt_queue)) { |
| struct sk_buff *skb = skb_dequeue(&mcast->pkt_queue); |
| |
| netif_tx_unlock_bh(dev); |
| |
| skb->dev = dev; |
| |
| ret = dev_queue_xmit(skb); |
| if (ret) |
| ipoib_warn(priv, "%s:dev_queue_xmit failed to re-queue packet, ret:%d\n", |
| __func__, ret); |
| netif_tx_lock_bh(dev); |
| } |
| netif_tx_unlock_bh(dev); |
| |
| return 0; |
| } |
| |
| void ipoib_mcast_carrier_on_task(struct work_struct *work) |
| { |
| struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv, |
| carrier_on_task); |
| struct ib_port_attr attr; |
| |
| if (ib_query_port(priv->ca, priv->port, &attr) || |
| attr.state != IB_PORT_ACTIVE) { |
| ipoib_dbg(priv, "Keeping carrier off until IB port is active\n"); |
| return; |
| } |
| /* |
| * Check if can send sendonly MCG's with sendonly-fullmember join state. |
| * It done here after the successfully join to the broadcast group, |
| * because the broadcast group must always be joined first and is always |
| * re-joined if the SM changes substantially. |
| */ |
| priv->sm_fullmember_sendonly_support = |
| ib_sa_sendonly_fullmem_support(&ipoib_sa_client, |
| priv->ca, priv->port); |
| /* |
| * Take rtnl_lock to avoid racing with ipoib_stop() and |
| * turning the carrier back on while a device is being |
| * removed. However, ipoib_stop() will attempt to flush |
| * the workqueue while holding the rtnl lock, so loop |
| * on trylock until either we get the lock or we see |
| * FLAG_OPER_UP go away as that signals that we are bailing |
| * and can safely ignore the carrier on work. |
| */ |
| while (!rtnl_trylock()) { |
| if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags)) |
| return; |
| else |
| msleep(20); |
| } |
| if (!ipoib_cm_admin_enabled(priv->dev)) |
| dev_set_mtu(priv->dev, min(priv->mcast_mtu, priv->admin_mtu)); |
| netif_carrier_on(priv->dev); |
| rtnl_unlock(); |
| } |
| |
| static int ipoib_mcast_join_complete(int status, |
| struct ib_sa_multicast *multicast) |
| { |
| struct ipoib_mcast *mcast = multicast->context; |
| struct net_device *dev = mcast->dev; |
| struct ipoib_dev_priv *priv = ipoib_priv(dev); |
| |
| ipoib_dbg_mcast(priv, "%sjoin completion for %pI6 (status %d)\n", |
| test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags) ? |
| "sendonly " : "", |
| mcast->mcmember.mgid.raw, status); |
| |
| /* We trap for port events ourselves. */ |
| if (status == -ENETRESET) { |
| status = 0; |
| goto out; |
| } |
| |
| if (!status) |
| status = ipoib_mcast_join_finish(mcast, &multicast->rec); |
| |
| if (!status) { |
| mcast->backoff = 1; |
| mcast->delay_until = jiffies; |
| |
| /* |
| * Defer carrier on work to priv->wq to avoid a |
| * deadlock on rtnl_lock here. Requeue our multicast |
| * work too, which will end up happening right after |
| * our carrier on task work and will allow us to |
| * send out all of the non-broadcast joins |
| */ |
| if (mcast == priv->broadcast) { |
| spin_lock_irq(&priv->lock); |
| queue_work(priv->wq, &priv->carrier_on_task); |
| __ipoib_mcast_schedule_join_thread(priv, NULL, 0); |
| goto out_locked; |
| } |
| } else { |
| bool silent_fail = |
| test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags) && |
| status == -EINVAL; |
| |
| if (mcast->logcount < 20) { |
| if (status == -ETIMEDOUT || status == -EAGAIN || |
| silent_fail) { |
| ipoib_dbg_mcast(priv, "%smulticast join failed for %pI6, status %d\n", |
| test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags) ? "sendonly " : "", |
| mcast->mcmember.mgid.raw, status); |
| } else { |
| ipoib_warn(priv, "%smulticast join failed for %pI6, status %d\n", |
| test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags) ? "sendonly " : "", |
| mcast->mcmember.mgid.raw, status); |
| } |
| |
| if (!silent_fail) |
| mcast->logcount++; |
| } |
| |
| if (test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags) && |
| mcast->backoff >= 2) { |
| /* |
| * We only retry sendonly joins once before we drop |
| * the packet and quit trying to deal with the |
| * group. However, we leave the group in the |
| * mcast list as an unjoined group. If we want to |
| * try joining again, we simply queue up a packet |
| * and restart the join thread. The empty queue |
| * is why the join thread ignores this group. |
| */ |
| mcast->backoff = 1; |
| netif_tx_lock_bh(dev); |
| while (!skb_queue_empty(&mcast->pkt_queue)) { |
| ++dev->stats.tx_dropped; |
| dev_kfree_skb_any(skb_dequeue(&mcast->pkt_queue)); |
| } |
| netif_tx_unlock_bh(dev); |
| } else { |
| spin_lock_irq(&priv->lock); |
| /* Requeue this join task with a backoff delay */ |
| __ipoib_mcast_schedule_join_thread(priv, mcast, 1); |
| goto out_locked; |
| } |
| } |
| out: |
| spin_lock_irq(&priv->lock); |
| out_locked: |
| /* |
| * Make sure to set mcast->mc before we clear the busy flag to avoid |
| * racing with code that checks for BUSY before checking mcast->mc |
| */ |
| if (status) |
| mcast->mc = NULL; |
| else |
| mcast->mc = multicast; |
| clear_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags); |
| spin_unlock_irq(&priv->lock); |
| complete(&mcast->done); |
| |
| return status; |
| } |
| |
| /* |
| * Caller must hold 'priv->lock' |
| */ |
| static int ipoib_mcast_join(struct net_device *dev, struct ipoib_mcast *mcast) |
| { |
| struct ipoib_dev_priv *priv = ipoib_priv(dev); |
| struct ib_sa_multicast *multicast; |
| struct ib_sa_mcmember_rec rec = { |
| .join_state = 1 |
| }; |
| ib_sa_comp_mask comp_mask; |
| int ret = 0; |
| |
| if (!priv->broadcast || |
| !test_bit(IPOIB_FLAG_OPER_UP, &priv->flags)) |
| return -EINVAL; |
| |
| init_completion(&mcast->done); |
| set_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags); |
| |
| ipoib_dbg_mcast(priv, "joining MGID %pI6\n", mcast->mcmember.mgid.raw); |
| |
| rec.mgid = mcast->mcmember.mgid; |
| rec.port_gid = priv->local_gid; |
| rec.pkey = cpu_to_be16(priv->pkey); |
| |
| comp_mask = |
| IB_SA_MCMEMBER_REC_MGID | |
| IB_SA_MCMEMBER_REC_PORT_GID | |
| IB_SA_MCMEMBER_REC_PKEY | |
| IB_SA_MCMEMBER_REC_JOIN_STATE; |
| |
| if (mcast != priv->broadcast) { |
| /* |
| * RFC 4391: |
| * The MGID MUST use the same P_Key, Q_Key, SL, MTU, |
| * and HopLimit as those used in the broadcast-GID. The rest |
| * of attributes SHOULD follow the values used in the |
| * broadcast-GID as well. |
| */ |
| comp_mask |= |
| IB_SA_MCMEMBER_REC_QKEY | |
| IB_SA_MCMEMBER_REC_MTU_SELECTOR | |
| IB_SA_MCMEMBER_REC_MTU | |
| IB_SA_MCMEMBER_REC_TRAFFIC_CLASS | |
| IB_SA_MCMEMBER_REC_RATE_SELECTOR | |
| IB_SA_MCMEMBER_REC_RATE | |
| IB_SA_MCMEMBER_REC_SL | |
| IB_SA_MCMEMBER_REC_FLOW_LABEL | |
| IB_SA_MCMEMBER_REC_HOP_LIMIT; |
| |
| rec.qkey = priv->broadcast->mcmember.qkey; |
| rec.mtu_selector = IB_SA_EQ; |
| rec.mtu = priv->broadcast->mcmember.mtu; |
| rec.traffic_class = priv->broadcast->mcmember.traffic_class; |
| rec.rate_selector = IB_SA_EQ; |
| rec.rate = priv->broadcast->mcmember.rate; |
| rec.sl = priv->broadcast->mcmember.sl; |
| rec.flow_label = priv->broadcast->mcmember.flow_label; |
| rec.hop_limit = priv->broadcast->mcmember.hop_limit; |
| |
| /* |
| * Send-only IB Multicast joins work at the core IB layer but |
| * require specific SM support. |
| * We can use such joins here only if the current SM supports that feature. |
| * However, if not, we emulate an Ethernet multicast send, |
| * which does not require a multicast subscription and will |
| * still send properly. The most appropriate thing to |
| * do is to create the group if it doesn't exist as that |
| * most closely emulates the behavior, from a user space |
| * application perspective, of Ethernet multicast operation. |
| */ |
| if (test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags) && |
| priv->sm_fullmember_sendonly_support) |
| /* SM supports sendonly-fullmember, otherwise fallback to full-member */ |
| rec.join_state = SENDONLY_FULLMEMBER_JOIN; |
| } |
| spin_unlock_irq(&priv->lock); |
| |
| multicast = ib_sa_join_multicast(&ipoib_sa_client, priv->ca, priv->port, |
| &rec, comp_mask, GFP_KERNEL, |
| ipoib_mcast_join_complete, mcast); |
| spin_lock_irq(&priv->lock); |
| if (IS_ERR(multicast)) { |
| ret = PTR_ERR(multicast); |
| ipoib_warn(priv, "ib_sa_join_multicast failed, status %d\n", ret); |
| /* Requeue this join task with a backoff delay */ |
| __ipoib_mcast_schedule_join_thread(priv, mcast, 1); |
| clear_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags); |
| spin_unlock_irq(&priv->lock); |
| complete(&mcast->done); |
| spin_lock_irq(&priv->lock); |
| } |
| return 0; |
| } |
| |
| void ipoib_mcast_join_task(struct work_struct *work) |
| { |
| struct ipoib_dev_priv *priv = |
| container_of(work, struct ipoib_dev_priv, mcast_task.work); |
| struct net_device *dev = priv->dev; |
| struct ib_port_attr port_attr; |
| unsigned long delay_until = 0; |
| struct ipoib_mcast *mcast = NULL; |
| |
| if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags)) |
| return; |
| |
| if (ib_query_port(priv->ca, priv->port, &port_attr)) { |
| ipoib_dbg(priv, "ib_query_port() failed\n"); |
| return; |
| } |
| if (port_attr.state != IB_PORT_ACTIVE) { |
| ipoib_dbg(priv, "port state is not ACTIVE (state = %d) suspending join task\n", |
| port_attr.state); |
| return; |
| } |
| priv->local_lid = port_attr.lid; |
| netif_addr_lock_bh(dev); |
| |
| if (!test_bit(IPOIB_FLAG_DEV_ADDR_SET, &priv->flags)) { |
| netif_addr_unlock_bh(dev); |
| return; |
| } |
| netif_addr_unlock_bh(dev); |
| |
| spin_lock_irq(&priv->lock); |
| if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags)) |
| goto out; |
| |
| if (!priv->broadcast) { |
| struct ipoib_mcast *broadcast; |
| |
| broadcast = ipoib_mcast_alloc(dev, 0); |
| if (!broadcast) { |
| ipoib_warn(priv, "failed to allocate broadcast group\n"); |
| /* |
| * Restart us after a 1 second delay to retry |
| * creating our broadcast group and attaching to |
| * it. Until this succeeds, this ipoib dev is |
| * completely stalled (multicast wise). |
| */ |
| __ipoib_mcast_schedule_join_thread(priv, NULL, 1); |
| goto out; |
| } |
| |
| memcpy(broadcast->mcmember.mgid.raw, priv->dev->broadcast + 4, |
| sizeof (union ib_gid)); |
| priv->broadcast = broadcast; |
| |
| __ipoib_mcast_add(dev, priv->broadcast); |
| } |
| |
| if (!test_bit(IPOIB_MCAST_FLAG_ATTACHED, &priv->broadcast->flags)) { |
| if (IS_ERR_OR_NULL(priv->broadcast->mc) && |
| !test_bit(IPOIB_MCAST_FLAG_BUSY, &priv->broadcast->flags)) { |
| mcast = priv->broadcast; |
| if (mcast->backoff > 1 && |
| time_before(jiffies, mcast->delay_until)) { |
| delay_until = mcast->delay_until; |
| mcast = NULL; |
| } |
| } |
| goto out; |
| } |
| |
| /* |
| * We'll never get here until the broadcast group is both allocated |
| * and attached |
| */ |
| list_for_each_entry(mcast, &priv->multicast_list, list) { |
| if (IS_ERR_OR_NULL(mcast->mc) && |
| !test_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags) && |
| (!test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags) || |
| !skb_queue_empty(&mcast->pkt_queue))) { |
| if (mcast->backoff == 1 || |
| time_after_eq(jiffies, mcast->delay_until)) { |
| /* Found the next unjoined group */ |
| if (ipoib_mcast_join(dev, mcast)) { |
| spin_unlock_irq(&priv->lock); |
| return; |
| } |
| } else if (!delay_until || |
| time_before(mcast->delay_until, delay_until)) |
| delay_until = mcast->delay_until; |
| } |
| } |
| |
| mcast = NULL; |
| ipoib_dbg_mcast(priv, "successfully started all multicast joins\n"); |
| |
| out: |
| if (delay_until) { |
| cancel_delayed_work(&priv->mcast_task); |
| queue_delayed_work(priv->wq, &priv->mcast_task, |
| delay_until - jiffies); |
| } |
| if (mcast) |
| ipoib_mcast_join(dev, mcast); |
| |
| spin_unlock_irq(&priv->lock); |
| } |
| |
| void ipoib_mcast_start_thread(struct net_device *dev) |
| { |
| struct ipoib_dev_priv *priv = ipoib_priv(dev); |
| unsigned long flags; |
| |
| ipoib_dbg_mcast(priv, "starting multicast thread\n"); |
| |
| spin_lock_irqsave(&priv->lock, flags); |
| __ipoib_mcast_schedule_join_thread(priv, NULL, 0); |
| spin_unlock_irqrestore(&priv->lock, flags); |
| } |
| |
| int ipoib_mcast_stop_thread(struct net_device *dev) |
| { |
| struct ipoib_dev_priv *priv = ipoib_priv(dev); |
| |
| ipoib_dbg_mcast(priv, "stopping multicast thread\n"); |
| |
| cancel_delayed_work_sync(&priv->mcast_task); |
| |
| return 0; |
| } |
| |
| static int ipoib_mcast_leave(struct net_device *dev, struct ipoib_mcast *mcast) |
| { |
| struct ipoib_dev_priv *priv = ipoib_priv(dev); |
| struct rdma_netdev *rn = netdev_priv(dev); |
| int ret = 0; |
| |
| if (test_and_clear_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags)) |
| ipoib_warn(priv, "ipoib_mcast_leave on an in-flight join\n"); |
| |
| if (!IS_ERR_OR_NULL(mcast->mc)) |
| ib_sa_free_multicast(mcast->mc); |
| |
| if (test_and_clear_bit(IPOIB_MCAST_FLAG_ATTACHED, &mcast->flags)) { |
| ipoib_dbg_mcast(priv, "leaving MGID %pI6\n", |
| mcast->mcmember.mgid.raw); |
| |
| /* Remove ourselves from the multicast group */ |
| ret = rn->detach_mcast(dev, priv->ca, &mcast->mcmember.mgid, |
| be16_to_cpu(mcast->mcmember.mlid)); |
| if (ret) |
| ipoib_warn(priv, "ib_detach_mcast failed (result = %d)\n", ret); |
| } else if (!test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags)) |
| ipoib_dbg(priv, "leaving with no mcmember but not a " |
| "SENDONLY join\n"); |
| |
| return 0; |
| } |
| |
| /* |
| * Check if the multicast group is sendonly. If so remove it from the maps |
| * and add to the remove list |
| */ |
| void ipoib_check_and_add_mcast_sendonly(struct ipoib_dev_priv *priv, u8 *mgid, |
| struct list_head *remove_list) |
| { |
| /* Is this multicast ? */ |
| if (*mgid == 0xff) { |
| struct ipoib_mcast *mcast = __ipoib_mcast_find(priv->dev, mgid); |
| |
| if (mcast && test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags)) { |
| list_del(&mcast->list); |
| rb_erase(&mcast->rb_node, &priv->multicast_tree); |
| list_add_tail(&mcast->list, remove_list); |
| } |
| } |
| } |
| |
| void ipoib_mcast_remove_list(struct list_head *remove_list) |
| { |
| struct ipoib_mcast *mcast, *tmcast; |
| |
| /* |
| * make sure the in-flight joins have finished before we attempt |
| * to leave |
| */ |
| list_for_each_entry_safe(mcast, tmcast, remove_list, list) |
| if (test_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags)) |
| wait_for_completion(&mcast->done); |
| |
| list_for_each_entry_safe(mcast, tmcast, remove_list, list) { |
| ipoib_mcast_leave(mcast->dev, mcast); |
| ipoib_mcast_free(mcast); |
| } |
| } |
| |
| void ipoib_mcast_send(struct net_device *dev, u8 *daddr, struct sk_buff *skb) |
| { |
| struct ipoib_dev_priv *priv = ipoib_priv(dev); |
| struct rdma_netdev *rn = netdev_priv(dev); |
| struct ipoib_mcast *mcast; |
| unsigned long flags; |
| void *mgid = daddr + 4; |
| |
| spin_lock_irqsave(&priv->lock, flags); |
| |
| if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags) || |
| !priv->broadcast || |
| !test_bit(IPOIB_MCAST_FLAG_ATTACHED, &priv->broadcast->flags)) { |
| ++dev->stats.tx_dropped; |
| dev_kfree_skb_any(skb); |
| goto unlock; |
| } |
| |
| mcast = __ipoib_mcast_find(dev, mgid); |
| if (!mcast || !mcast->ah) { |
| if (!mcast) { |
| /* Let's create a new send only group now */ |
| ipoib_dbg_mcast(priv, "setting up send only multicast group for %pI6\n", |
| mgid); |
| |
| mcast = ipoib_mcast_alloc(dev, 0); |
| if (!mcast) { |
| ipoib_warn(priv, "unable to allocate memory " |
| "for multicast structure\n"); |
| ++dev->stats.tx_dropped; |
| dev_kfree_skb_any(skb); |
| goto unlock; |
| } |
| |
| set_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags); |
| memcpy(mcast->mcmember.mgid.raw, mgid, |
| sizeof (union ib_gid)); |
| __ipoib_mcast_add(dev, mcast); |
| list_add_tail(&mcast->list, &priv->multicast_list); |
| } |
| if (skb_queue_len(&mcast->pkt_queue) < IPOIB_MAX_MCAST_QUEUE) { |
| /* put pseudoheader back on for next time */ |
| skb_push(skb, sizeof(struct ipoib_pseudo_header)); |
| skb_queue_tail(&mcast->pkt_queue, skb); |
| } else { |
| ++dev->stats.tx_dropped; |
| dev_kfree_skb_any(skb); |
| } |
| if (!test_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags)) { |
| __ipoib_mcast_schedule_join_thread(priv, NULL, 0); |
| } |
| } else { |
| struct ipoib_neigh *neigh; |
| |
| spin_unlock_irqrestore(&priv->lock, flags); |
| neigh = ipoib_neigh_get(dev, daddr); |
| spin_lock_irqsave(&priv->lock, flags); |
| if (!neigh) { |
| neigh = ipoib_neigh_alloc(daddr, dev); |
| /* Make sure that the neigh will be added only |
| * once to mcast list. |
| */ |
| if (neigh && list_empty(&neigh->list)) { |
| kref_get(&mcast->ah->ref); |
| neigh->ah = mcast->ah; |
| neigh->ah->valid = 1; |
| list_add_tail(&neigh->list, &mcast->neigh_list); |
| } |
| } |
| spin_unlock_irqrestore(&priv->lock, flags); |
| mcast->ah->last_send = rn->send(dev, skb, mcast->ah->ah, |
| IB_MULTICAST_QPN); |
| if (neigh) |
| ipoib_neigh_put(neigh); |
| return; |
| } |
| |
| unlock: |
| spin_unlock_irqrestore(&priv->lock, flags); |
| } |
| |
| void ipoib_mcast_dev_flush(struct net_device *dev) |
| { |
| struct ipoib_dev_priv *priv = ipoib_priv(dev); |
| LIST_HEAD(remove_list); |
| struct ipoib_mcast *mcast, *tmcast; |
| unsigned long flags; |
| |
| mutex_lock(&priv->mcast_mutex); |
| ipoib_dbg_mcast(priv, "flushing multicast list\n"); |
| |
| spin_lock_irqsave(&priv->lock, flags); |
| |
| list_for_each_entry_safe(mcast, tmcast, &priv->multicast_list, list) { |
| list_del(&mcast->list); |
| rb_erase(&mcast->rb_node, &priv->multicast_tree); |
| list_add_tail(&mcast->list, &remove_list); |
| } |
| |
| if (priv->broadcast) { |
| rb_erase(&priv->broadcast->rb_node, &priv->multicast_tree); |
| list_add_tail(&priv->broadcast->list, &remove_list); |
| priv->broadcast = NULL; |
| } |
| |
| spin_unlock_irqrestore(&priv->lock, flags); |
| |
| ipoib_mcast_remove_list(&remove_list); |
| mutex_unlock(&priv->mcast_mutex); |
| } |
| |
| static int ipoib_mcast_addr_is_valid(const u8 *addr, const u8 *broadcast) |
| { |
| /* reserved QPN, prefix, scope */ |
| if (memcmp(addr, broadcast, 6)) |
| return 0; |
| /* signature lower, pkey */ |
| if (memcmp(addr + 7, broadcast + 7, 3)) |
| return 0; |
| return 1; |
| } |
| |
| void ipoib_mcast_restart_task(struct work_struct *work) |
| { |
| struct ipoib_dev_priv *priv = |
| container_of(work, struct ipoib_dev_priv, restart_task); |
| struct net_device *dev = priv->dev; |
| struct netdev_hw_addr *ha; |
| struct ipoib_mcast *mcast, *tmcast; |
| LIST_HEAD(remove_list); |
| struct ib_sa_mcmember_rec rec; |
| |
| if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags)) |
| /* |
| * shortcut...on shutdown flush is called next, just |
| * let it do all the work |
| */ |
| return; |
| |
| ipoib_dbg_mcast(priv, "restarting multicast task\n"); |
| |
| netif_addr_lock_bh(dev); |
| spin_lock_irq(&priv->lock); |
| |
| /* |
| * Unfortunately, the networking core only gives us a list of all of |
| * the multicast hardware addresses. We need to figure out which ones |
| * are new and which ones have been removed |
| */ |
| |
| /* Clear out the found flag */ |
| list_for_each_entry(mcast, &priv->multicast_list, list) |
| clear_bit(IPOIB_MCAST_FLAG_FOUND, &mcast->flags); |
| |
| /* Mark all of the entries that are found or don't exist */ |
| netdev_for_each_mc_addr(ha, dev) { |
| union ib_gid mgid; |
| |
| if (!ipoib_mcast_addr_is_valid(ha->addr, dev->broadcast)) |
| continue; |
| |
| memcpy(mgid.raw, ha->addr + 4, sizeof(mgid)); |
| |
| mcast = __ipoib_mcast_find(dev, &mgid); |
| if (!mcast || test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags)) { |
| struct ipoib_mcast *nmcast; |
| |
| /* ignore group which is directly joined by userspace */ |
| if (test_bit(IPOIB_FLAG_UMCAST, &priv->flags) && |
| !ib_sa_get_mcmember_rec(priv->ca, priv->port, &mgid, &rec)) { |
| ipoib_dbg_mcast(priv, "ignoring multicast entry for mgid %pI6\n", |
| mgid.raw); |
| continue; |
| } |
| |
| /* Not found or send-only group, let's add a new entry */ |
| ipoib_dbg_mcast(priv, "adding multicast entry for mgid %pI6\n", |
| mgid.raw); |
| |
| nmcast = ipoib_mcast_alloc(dev, 0); |
| if (!nmcast) { |
| ipoib_warn(priv, "unable to allocate memory for multicast structure\n"); |
| continue; |
| } |
| |
| set_bit(IPOIB_MCAST_FLAG_FOUND, &nmcast->flags); |
| |
| nmcast->mcmember.mgid = mgid; |
| |
| if (mcast) { |
| /* Destroy the send only entry */ |
| list_move_tail(&mcast->list, &remove_list); |
| |
| rb_replace_node(&mcast->rb_node, |
| &nmcast->rb_node, |
| &priv->multicast_tree); |
| } else |
| __ipoib_mcast_add(dev, nmcast); |
| |
| list_add_tail(&nmcast->list, &priv->multicast_list); |
| } |
| |
| if (mcast) |
| set_bit(IPOIB_MCAST_FLAG_FOUND, &mcast->flags); |
| } |
| |
| /* Remove all of the entries don't exist anymore */ |
| list_for_each_entry_safe(mcast, tmcast, &priv->multicast_list, list) { |
| if (!test_bit(IPOIB_MCAST_FLAG_FOUND, &mcast->flags) && |
| !test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags)) { |
| ipoib_dbg_mcast(priv, "deleting multicast group %pI6\n", |
| mcast->mcmember.mgid.raw); |
| |
| rb_erase(&mcast->rb_node, &priv->multicast_tree); |
| |
| /* Move to the remove list */ |
| list_move_tail(&mcast->list, &remove_list); |
| } |
| } |
| |
| spin_unlock_irq(&priv->lock); |
| netif_addr_unlock_bh(dev); |
| |
| ipoib_mcast_remove_list(&remove_list); |
| |
| /* |
| * Double check that we are still up |
| */ |
| if (test_bit(IPOIB_FLAG_OPER_UP, &priv->flags)) { |
| spin_lock_irq(&priv->lock); |
| __ipoib_mcast_schedule_join_thread(priv, NULL, 0); |
| spin_unlock_irq(&priv->lock); |
| } |
| } |
| |
| #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG |
| |
| struct ipoib_mcast_iter *ipoib_mcast_iter_init(struct net_device *dev) |
| { |
| struct ipoib_mcast_iter *iter; |
| |
| iter = kmalloc(sizeof(*iter), GFP_KERNEL); |
| if (!iter) |
| return NULL; |
| |
| iter->dev = dev; |
| memset(iter->mgid.raw, 0, 16); |
| |
| if (ipoib_mcast_iter_next(iter)) { |
| kfree(iter); |
| return NULL; |
| } |
| |
| return iter; |
| } |
| |
| int ipoib_mcast_iter_next(struct ipoib_mcast_iter *iter) |
| { |
| struct ipoib_dev_priv *priv = ipoib_priv(iter->dev); |
| struct rb_node *n; |
| struct ipoib_mcast *mcast; |
| int ret = 1; |
| |
| spin_lock_irq(&priv->lock); |
| |
| n = rb_first(&priv->multicast_tree); |
| |
| while (n) { |
| mcast = rb_entry(n, struct ipoib_mcast, rb_node); |
| |
| if (memcmp(iter->mgid.raw, mcast->mcmember.mgid.raw, |
| sizeof (union ib_gid)) < 0) { |
| iter->mgid = mcast->mcmember.mgid; |
| iter->created = mcast->created; |
| iter->queuelen = skb_queue_len(&mcast->pkt_queue); |
| iter->complete = !!mcast->ah; |
| iter->send_only = !!(mcast->flags & (1 << IPOIB_MCAST_FLAG_SENDONLY)); |
| |
| ret = 0; |
| |
| break; |
| } |
| |
| n = rb_next(n); |
| } |
| |
| spin_unlock_irq(&priv->lock); |
| |
| return ret; |
| } |
| |
| void ipoib_mcast_iter_read(struct ipoib_mcast_iter *iter, |
| union ib_gid *mgid, |
| unsigned long *created, |
| unsigned int *queuelen, |
| unsigned int *complete, |
| unsigned int *send_only) |
| { |
| *mgid = iter->mgid; |
| *created = iter->created; |
| *queuelen = iter->queuelen; |
| *complete = iter->complete; |
| *send_only = iter->send_only; |
| } |
| |
| #endif /* CONFIG_INFINIBAND_IPOIB_DEBUG */ |