--- /dev/null
+/*
+ * 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;
+};
+
+/*
+ * 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(netdev_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 = netdev_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 = netdev_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 = netdev_priv(dev);
+ struct ipoib_ah *ah;
+ 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.wr.ud.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 = ipoib_mcast_attach(dev, be16_to_cpu(mcast->mcmember.mlid),
+ &mcast->mcmember.mgid, set_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;
+ }
+ }
+
+ {
+ struct ib_ah_attr av = {
+ .dlid = be16_to_cpu(mcast->mcmember.mlid),
+ .port_num = priv->port,
+ .sl = mcast->mcmember.sl,
+ .ah_flags = IB_AH_GRH,
+ .static_rate = mcast->mcmember.rate,
+ .grh = {
+ .flow_label = be32_to_cpu(mcast->mcmember.flow_label),
+ .hop_limit = mcast->mcmember.hop_limit,
+ .sgid_index = 0,
+ .traffic_class = mcast->mcmember.traffic_class
+ }
+ };
+ av.grh.dgid = mcast->mcmember.mgid;
+
+ 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);
+ } else {
+ 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;
+ if (dev_queue_xmit(skb))
+ ipoib_warn(priv, "dev_queue_xmit failed to requeue packet\n");
+
+ 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;
+ }
+
+ /*
+ * 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 = netdev_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 {
+ if (mcast->logcount++ < 20) {
+ if (status == -ETIMEDOUT || status == -EAGAIN) {
+ 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 (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;
+}
+
+static void ipoib_mcast_join(struct net_device *dev, struct ipoib_mcast *mcast,
+ int create)
+{
+ struct ipoib_dev_priv *priv = netdev_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;
+
+ 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 (create) {
+ 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;
+ }
+
+ multicast = ib_sa_join_multicast(&ipoib_sa_client, priv->ca, priv->port,
+ &rec, comp_mask, GFP_KERNEL,
+ ipoib_mcast_join_complete, mcast);
+ if (IS_ERR(multicast)) {
+ ret = PTR_ERR(multicast);
+ ipoib_warn(priv, "ib_sa_join_multicast failed, status %d\n", ret);
+ spin_lock_irq(&priv->lock);
+ /* 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);
+ }
+}
+
+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;
+ int create = 1;
+
+ if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags))
+ return;
+
+ if (ib_query_port(priv->ca, priv->port, &port_attr) ||
+ 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;
+
+ if (ib_query_gid(priv->ca, priv->port, 0, &priv->local_gid))
+ ipoib_warn(priv, "ib_query_gid() failed\n");
+ else
+ memcpy(priv->dev->dev_addr + 4, priv->local_gid.raw, sizeof (union ib_gid));
+
+ 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;
+ create = 0;
+ 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 */
+ init_completion(&mcast->done);
+ set_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags);
+ if (test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags))
+ create = 0;
+ else
+ create = 1;
+ spin_unlock_irq(&priv->lock);
+ ipoib_mcast_join(dev, mcast, create);
+ spin_lock_irq(&priv->lock);
+ } 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) {
+ init_completion(&mcast->done);
+ set_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags);
+ }
+ spin_unlock_irq(&priv->lock);
+ if (mcast)
+ ipoib_mcast_join(dev, mcast, create);
+}
+
+int ipoib_mcast_start_thread(struct net_device *dev)
+{
+ struct ipoib_dev_priv *priv = netdev_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);
+
+ return 0;
+}
+
+int ipoib_mcast_stop_thread(struct net_device *dev)
+{
+ struct ipoib_dev_priv *priv = netdev_priv(dev);
+ unsigned long flags;
+
+ ipoib_dbg_mcast(priv, "stopping multicast thread\n");
+
+ spin_lock_irqsave(&priv->lock, flags);
+ cancel_delayed_work(&priv->mcast_task);
+ spin_unlock_irqrestore(&priv->lock, flags);
+
+ flush_workqueue(priv->wq);
+
+ return 0;
+}
+
+static int ipoib_mcast_leave(struct net_device *dev, struct ipoib_mcast *mcast)
+{
+ struct ipoib_dev_priv *priv = 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 = ib_detach_mcast(priv->qp, &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;
+}
+
+void ipoib_mcast_send(struct net_device *dev, u8 *daddr, struct sk_buff *skb)
+{
+ struct ipoib_dev_priv *priv = 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)
+ 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);
+ if (neigh) {
+ kref_get(&mcast->ah->ref);
+ neigh->ah = mcast->ah;
+ list_add_tail(&neigh->list, &mcast->neigh_list);
+ }
+ }
+ spin_unlock_irqrestore(&priv->lock, flags);
+ ipoib_send(dev, skb, mcast->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 = netdev_priv(dev);
+ LIST_HEAD(remove_list);
+ struct ipoib_mcast *mcast, *tmcast;
+ unsigned long flags;
+
+ 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);
+
+ /*
+ * 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(dev, mcast);
+ ipoib_mcast_free(mcast);
+ }
+}
+
+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);
+ unsigned long flags;
+ 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");
+
+ local_irq_save_nort(flags);
+ netif_addr_lock(dev);
+ spin_lock(&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(&priv->lock);
+ netif_addr_unlock(dev);
+ local_irq_restore_nort(flags);
+
+ /*
+ * 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);
+ }
+
+ /*
+ * Double check that we are still up
+ */
+ if (test_bit(IPOIB_FLAG_OPER_UP, &priv->flags)) {
+ spin_lock_irqsave(&priv->lock, flags);
+ __ipoib_mcast_schedule_join_thread(priv, NULL, 0);
+ spin_unlock_irqrestore(&priv->lock, flags);
+ }
+}
+
+#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 = netdev_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 */
Code Review / kvmfornfv.git / blobdiff