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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.h | |
| parent | fc77dbd34c5c99bce46d40a2491937c3bcbd10af (diff) | |
| download | linux-78a50a5e6068955494117b37b03379dacaf830b7.tar.gz linux-78a50a5e6068955494117b37b03379dacaf830b7.tar.bz2 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.h')
| -rw-r--r-- | drivers/infiniband/ulp/ipoib/ipoib.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/infiniband/ulp/ipoib/ipoib.h b/drivers/infiniband/ulp/ipoib/ipoib.h index a6f3eab0f350..85be0de3ab26 100644 --- a/drivers/infiniband/ulp/ipoib/ipoib.h +++ b/drivers/infiniband/ulp/ipoib/ipoib.h @@ -244,6 +244,7 @@ struct ipoib_cm_tx { unsigned tx_tail; unsigned long flags; u32 mtu; + unsigned max_send_sge; }; struct ipoib_cm_rx_buf { @@ -390,6 +391,7 @@ struct ipoib_dev_priv { int hca_caps; struct ipoib_ethtool_st ethtool; struct timer_list poll_timer; + unsigned max_send_sge; }; struct ipoib_ah { |