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| author |   Hans Westgaard Ry <hans.westgaard.ry@oracle.com> | 2016-03-02 13:44:28 +0100 |
|---|---|---|
| committer |   Doug Ledford <dledford@redhat.com> | 2016-03-03 09:49:44 -0500 |
| commit | 78a50a5e6068955494117b37b03379dacaf830b7 (patch) | |
| tree | f3d16185b8e004c08c63aa37ff78fb0ddefe1457 /drivers/infiniband/ulp/ipoib/ipoib_verbs.c | |
| parent | Linux 4.5-rc6 (diff) | |
| download | wireguard-linux-78a50a5e6068955494117b37b03379dacaf830b7.tar.xz wireguard-linux-78a50a5e6068955494117b37b03379dacaf830b7.zip | |
IB/ipoib: Add handling for sending of skb with many frags
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>
Diffstat (limited to 'drivers/infiniband/ulp/ipoib/ipoib_verbs.c')
| -rw-r--r-- | drivers/infiniband/ulp/ipoib/ipoib_verbs.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/drivers/infiniband/ulp/ipoib/ipoib_verbs.c b/drivers/infiniband/ulp/ipoib/ipoib_verbs.c index d48c5bae7877..b809c373e40e 100644 --- a/drivers/infiniband/ulp/ipoib/ipoib_verbs.c +++ b/drivers/infiniband/ulp/ipoib/ipoib_verbs.c @@ -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: |