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authorNick Nunley <nicholasx.d.nunley@intel.com>2010-02-17 04:03:38 +0300
committerDavid S. Miller <davem@davemloft.net>2010-02-18 00:21:35 +0300
commite6bdb6fefc590ad2fb5f79e1d1d3660afbc7c8ff (patch)
treede374c6ccde506f8311fdd43343debe967b5d97f /drivers/net/igb
parentabe1c3638ccf8b68536afb52b111f6ad46d1cf71 (diff)
downloadlinux-e6bdb6fefc590ad2fb5f79e1d1d3660afbc7c8ff.tar.xz
igb: only support SRRCTL_DROP_EN when using multiple queues
The SRRCTL.DROP_EN bit should only be set when we are supporting multiple queues. This bit is meant to prevent head of line blocking and is unnecessary in the single queue case. Signed-off-by: Nicholas Nunley <nicholasx.d.nunley@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')
-rw-r--r--drivers/net/igb/igb_main.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/net/igb/igb_main.c b/drivers/net/igb/igb_main.c
index 4ccc7fc70f53..b989b34a4adb 100644
--- a/drivers/net/igb/igb_main.c
+++ b/drivers/net/igb/igb_main.c
@@ -2595,6 +2595,9 @@ void igb_configure_rx_ring(struct igb_adapter *adapter,
E1000_SRRCTL_BSIZEPKT_SHIFT;
srrctl |= E1000_SRRCTL_DESCTYPE_ADV_ONEBUF;
}
+ /* Only set Drop Enable if we are supporting multiple queues */
+ if (adapter->vfs_allocated_count || adapter->num_rx_queues > 1)
+ srrctl |= E1000_SRRCTL_DROP_EN;
wr32(E1000_SRRCTL(reg_idx), srrctl);