diff options
| author | Alexander Duyck <alexander.h.duyck@intel.com> | 2010-07-01 20:01:05 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2010-07-05 18:50:54 -0700 |
| commit | 4478a9cdf007a0418755a8a4016af8352fb1c1f3 (patch) | |
| tree | ca8a8ba6059ac49f780b2c9e8cb7517394481bbf /drivers/net/igb/igb_main.c | |
| parent | 39827be26b36ef9cdbc661c92a269e0484cd9ef5 (diff) | |
| download | blackbird-op-linux-4478a9cdf007a0418755a8a4016af8352fb1c1f3.tar.gz blackbird-op-linux-4478a9cdf007a0418755a8a4016af8352fb1c1f3.zip | |
igb: drop support for UDP hashing w/ RSS
This change removes UDP from the supported protocols for RSS hashing. The
reason for removing this protocol is because IP fragmentation was causing a
network flow to be broken into two streams, one for fragmented, and one for
non-fragmented and this in turn was causing out-of-order issues.
Signed-off-by: Alexander Duyck <alexander.h.duyck@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/igb/igb_main.c')
| -rw-r--r-- | drivers/net/igb/igb_main.c | 18 |
1 files changed, 10 insertions, 8 deletions
diff --git a/drivers/net/igb/igb_main.c b/drivers/net/igb/igb_main.c index 9cb04e29ad13..94656179441d 100644 --- a/drivers/net/igb/igb_main.c +++ b/drivers/net/igb/igb_main.c @@ -2717,14 +2717,16 @@ static void igb_setup_mrqc(struct igb_adapter *adapter) } igb_vmm_control(adapter); - mrqc |= (E1000_MRQC_RSS_FIELD_IPV4 | - E1000_MRQC_RSS_FIELD_IPV4_TCP); - mrqc |= (E1000_MRQC_RSS_FIELD_IPV6 | - E1000_MRQC_RSS_FIELD_IPV6_TCP); - mrqc |= (E1000_MRQC_RSS_FIELD_IPV4_UDP | - E1000_MRQC_RSS_FIELD_IPV6_UDP); - mrqc |= (E1000_MRQC_RSS_FIELD_IPV6_UDP_EX | - E1000_MRQC_RSS_FIELD_IPV6_TCP_EX); + /* + * Generate RSS hash based on TCP port numbers and/or + * IPv4/v6 src and dst addresses since UDP cannot be + * hashed reliably due to IP fragmentation + */ + mrqc |= E1000_MRQC_RSS_FIELD_IPV4 | + E1000_MRQC_RSS_FIELD_IPV4_TCP | + E1000_MRQC_RSS_FIELD_IPV6 | + E1000_MRQC_RSS_FIELD_IPV6_TCP | + E1000_MRQC_RSS_FIELD_IPV6_TCP_EX; wr32(E1000_MRQC, mrqc); } |
