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IPoIB: Use multicast loopback blocking if available

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Set IB_QP_CREATE_BLOCK_MULTICAST_LOOPBACK for IPoIB's UD QPs if
supported by the underlying device.  This creates an improvement of up
to 39% in bandwidth when sending multicast packets with IPoIB, and an
improvment of 12% in cpu usage.

Signed-off-by: Ron Livne <ronli@voltaire.com>
Signed-off-by: Roland Dreier <rolandd@cisco.com>
This commit is contained in:
Ron Livne 2008-07-14 23:48:48 -07:00 committed by Roland Dreier
parent 521e575b9a
commit 1240673405
1 changed files with 4 additions and 1 deletions
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5
drivers/infiniband/ulp/ipoib/ipoib_verbs.c
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@ -199,7 +199,10 @@ int ipoib_transport_dev_init(struct net_device *dev, struct ib_device *ca)
init_attr.recv_cq = priv->recv_cq;
if (priv->hca_caps & IB_DEVICE_UD_TSO)
init_attr.create_flags = IB_QP_CREATE_IPOIB_UD_LSO;
init_attr.create_flags |= IB_QP_CREATE_IPOIB_UD_LSO;
if (priv->hca_caps & IB_DEVICE_BLOCK_MULTICAST_LOOPBACK)
init_attr.create_flags |= IB_QP_CREATE_BLOCK_MULTICAST_LOOPBACK;
if (dev->features & NETIF_F_SG)
init_attr.cap.max_send_sge = MAX_SKB_FRAGS + 1;