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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>
This commit is contained in:
Nick Nunley 2010-02-17 01:03:38 +00:00 committed by David S. Miller
parent abe1c3638c
commit e6bdb6fefc
1 changed files with 3 additions and 0 deletions
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3
drivers/net/igb/igb_main.c
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@ -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);