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IB/ipoib: Add handling for sending of skb with many frags

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IPoIB converts skb-fragments to sge adding 1 extra sge when SG is enabled.
Current codepath assumes that the max number of sge a device support
is at least MAX_SKB_FRAGS+1, there is no interaction with upper layers
to limit number of fragments in an skb if a device suports fewer
sges. The assumptions also lead to requesting a fixed number of sge
when IPoIB creates queue-pairs with SG enabled.

A fallback/slowpath is implemented using skb_linearize to
handle cases where the conversion would result in more sges than supported.

Signed-off-by: Hans Westgaard Ry <hans.westgaard.ry@oracle.com>
Reviewed-by: Håkon Bugge <haakon.bugge@oracle.com>
Reviewed-by: Wei Lin Guay <wei.lin.guay@oracle.com>
Reviewed-by: Yuval Shaia <yuval.shaia@oracle.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>
This commit is contained in:
Hans Westgaard Ry
2016-03-02 13:44:28 +01:00
committed by Doug Ledford
parent fc77dbd34c
commit 78a50a5e60
4 changed files with 45 additions and 3 deletions
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5
drivers/infiniband/ulp/ipoib/ipoib_verbs.c
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@@ -206,7 +206,8 @@ int ipoib_transport_dev_init(struct net_device *dev, struct ib_device *ca)
init_attr.create_flags |= IB_QP_CREATE_NETIF_QP;
if (dev->features & NETIF_F_SG)
init_attr.cap.max_send_sge = MAX_SKB_FRAGS + 1;
init_attr.cap.max_send_sge =
min_t(u32, priv->ca->attrs.max_sge, MAX_SKB_FRAGS + 1);
priv->qp = ib_create_qp(priv->pd, &init_attr);
if (IS_ERR(priv->qp)) {
@@ -233,6 +234,8 @@ int ipoib_transport_dev_init(struct net_device *dev, struct ib_device *ca)
priv->rx_wr.next = NULL;
priv->rx_wr.sg_list = priv->rx_sge;
priv->max_send_sge = init_attr.cap.max_send_sge;
return 0;
out_free_send_cq: