IPoIB: Support modifying IPoIB CQ event moderation

This can be used to tune at run time the parameters controlling the
event (interrupt) generation rate and thus reduce the overhead
incurred by handling interrupts resulting in better throughput.  Since
IPoIB uses a single CQ for both RX and TX, RX is chosen to dictate
configuration for both RX and TX.

Signed-off-by: Eli Cohen <eli@mellanox.co.il>
Signed-off-by: Roland Dreier <rolandd@cisco.com>

1 files changed, 6 insertions, 0 deletions

diff --git a/drivers/infiniband/ulp/ipoib/ipoib.h b/drivers/infiniband/ulp/ipoib/ipoib.h
index 3524d65f2e57..73b2b176ad0e 100644
--- a/drivers/infiniband/ulp/ipoib/ipoib.h
+++ b/drivers/infiniband/ulp/ipoib/ipoib.h
@@ -242,6 +242,11 @@ struct ipoib_cm_dev_priv {
         int                     num_frags;
 };
 
+struct ipoib_ethtool_st {
+        u16     coalesce_usecs;
+        u16     max_coalesced_frames;
+};
+
 /*
  * Device private locking: tx_lock protects members used in TX fast
  * path (and we use LLTX so upper layers don't do extra locking).
@@ -320,6 +325,7 @@ struct ipoib_dev_priv {
         struct dentry *path_dentry;
 #endif
         int     hca_caps;
+        struct ipoib_ethtool_st ethtool;
 };
 
 struct ipoib_ah {