From 335a64a5a958002bc238c90de695e120c3c8c120 Mon Sep 17 00:00:00 2001 From: Or Gerlitz Date: Mon, 8 Oct 2007 10:13:00 +0200 Subject: [PATCH] IPoIB: Allow setting policy to ignore multicast groups The kernel IB stack allows (through the RDMA CM) userspace applications to join and use multicast groups from the IPoIB MGID range. This allows multicast traffic to be handled directly from userspace QPs, without going through the kernel stack, which gives better performance for some applications. However, to fully interoperate with IP multicast, such userspace applications need to participate in IGMP reports and queries, or else routers may not forward the multicast traffic to the system where the application is running. The simplest way to do this is to share the kernel IGMP implementation by using the IP_ADD_MEMBERSHIP option to join multicast groups that are being handled directly in userspace. However, in such cases, the actual multicast traffic should not also be handled by the IPoIB interface, because that would burn resources handling multicast packets that will just be discarded in the kernel. To handle this, this patch adds lookup on the database used for IB multicast group reference counting when IPoIB is joining multicast groups, and if a multicast group is already handled by user space, then the IPoIB kernel driver ignores the group. This is controlled by a per-interface policy flag. When the flag is set, IPoIB will not join and attach its QP to a multicast group which already has an entry in the database; when the flag is cleared, IPoIB will behave as before this change. For each IPoIB interface, the /sys/class/net/$intf/umcast attribute controls the policy flag. The default value is off/0. Signed-off-by: Or Gerlitz Signed-off-by: Roland Dreier --- drivers/infiniband/ulp/ipoib/ipoib.h | 2 ++ drivers/infiniband/ulp/ipoib/ipoib_main.c | 33 ++++++++++++++++++++++++++ drivers/infiniband/ulp/ipoib/ipoib_multicast.c | 9 +++++++ drivers/infiniband/ulp/ipoib/ipoib_vlan.c | 2 ++ 4 files changed, 46 insertions(+) diff --git a/drivers/infiniband/ulp/ipoib/ipoib.h b/drivers/infiniband/ulp/ipoib/ipoib.h index fc16bce..a198ce8 100644 --- a/drivers/infiniband/ulp/ipoib/ipoib.h +++ b/drivers/infiniband/ulp/ipoib/ipoib.h @@ -86,6 +86,7 @@ enum { IPOIB_MCAST_STARTED = 8, IPOIB_FLAG_NETIF_STOPPED = 9, IPOIB_FLAG_ADMIN_CM = 10, + IPOIB_FLAG_UMCAST = 11, IPOIB_MAX_BACKOFF_SECONDS = 16, @@ -384,6 +385,7 @@ static inline void ipoib_put_ah(struct ipoib_ah *ah) int ipoib_open(struct net_device *dev); int ipoib_add_pkey_attr(struct net_device *dev); +int ipoib_add_umcast_attr(struct net_device *dev); void ipoib_send(struct net_device *dev, struct sk_buff *skb, struct ipoib_ah *address, u32 qpn); diff --git a/drivers/infiniband/ulp/ipoib/ipoib_main.c b/drivers/infiniband/ulp/ipoib/ipoib_main.c index 900335a..ff17fe3 100644 --- a/drivers/infiniband/ulp/ipoib/ipoib_main.c +++ b/drivers/infiniband/ulp/ipoib/ipoib_main.c @@ -1019,6 +1019,37 @@ static ssize_t show_pkey(struct device *dev, } static DEVICE_ATTR(pkey, S_IRUGO, show_pkey, NULL); +static ssize_t show_umcast(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct ipoib_dev_priv *priv = netdev_priv(to_net_dev(dev)); + + return sprintf(buf, "%d\n", test_bit(IPOIB_FLAG_UMCAST, &priv->flags)); +} + +static ssize_t set_umcast(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t count) +{ + struct ipoib_dev_priv *priv = netdev_priv(to_net_dev(dev)); + unsigned long umcast_val = simple_strtoul(buf, NULL, 0); + + if (umcast_val > 0) { + set_bit(IPOIB_FLAG_UMCAST, &priv->flags); + ipoib_warn(priv, "ignoring multicast groups joined directly " + "by userspace\n"); + } else + clear_bit(IPOIB_FLAG_UMCAST, &priv->flags); + + return count; +} +static DEVICE_ATTR(umcast, S_IWUSR | S_IRUGO, show_umcast, set_umcast); + +int ipoib_add_umcast_attr(struct net_device *dev) +{ + return device_create_file(&dev->dev, &dev_attr_umcast); +} + static ssize_t create_child(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) @@ -1136,6 +1167,8 @@ static struct net_device *ipoib_add_port(const char *format, goto sysfs_failed; if (ipoib_add_pkey_attr(priv->dev)) goto sysfs_failed; + if (ipoib_add_umcast_attr(priv->dev)) + goto sysfs_failed; if (device_create_file(&priv->dev->dev, &dev_attr_create_child)) goto sysfs_failed; if (device_create_file(&priv->dev->dev, &dev_attr_delete_child)) diff --git a/drivers/infiniband/ulp/ipoib/ipoib_multicast.c b/drivers/infiniband/ulp/ipoib/ipoib_multicast.c index 94a5709..62abfb6 100644 --- a/drivers/infiniband/ulp/ipoib/ipoib_multicast.c +++ b/drivers/infiniband/ulp/ipoib/ipoib_multicast.c @@ -761,6 +761,7 @@ void ipoib_mcast_restart_task(struct work_struct *work) struct ipoib_mcast *mcast, *tmcast; LIST_HEAD(remove_list); unsigned long flags; + struct ib_sa_mcmember_rec rec; ipoib_dbg_mcast(priv, "restarting multicast task\n"); @@ -794,6 +795,14 @@ void ipoib_mcast_restart_task(struct work_struct *work) 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 " + IPOIB_GID_FMT "\n", IPOIB_GID_ARG(mgid)); + continue; + } + /* Not found or send-only group, let's add a new entry */ ipoib_dbg_mcast(priv, "adding multicast entry for mgid " IPOIB_GID_FMT "\n", IPOIB_GID_ARG(mgid)); diff --git a/drivers/infiniband/ulp/ipoib/ipoib_vlan.c b/drivers/infiniband/ulp/ipoib/ipoib_vlan.c index 6762988..293f5b8 100644 --- a/drivers/infiniband/ulp/ipoib/ipoib_vlan.c +++ b/drivers/infiniband/ulp/ipoib/ipoib_vlan.c @@ -119,6 +119,8 @@ int ipoib_vlan_add(struct net_device *pdev, unsigned short pkey) goto sysfs_failed; if (ipoib_add_pkey_attr(priv->dev)) goto sysfs_failed; + if (ipoib_add_umcast_attr(priv->dev)) + goto sysfs_failed; if (device_create_file(&priv->dev->dev, &dev_attr_parent)) goto sysfs_failed; -- 2.7.4