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igb: update handling of RCTL for smaller buffer sizes 

As we begin to move into virtualization the use of a global value for
buffer sizes becomes undesirable.  This change makes it so only 256 and 512
byte buffers require use of the RCTL register.

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>
This commit is contained in:
Alexander Duyck 2008-12-10 01:08:59 -08:00 committed by David S. Miller
parent e97fd7c6d5
commit b4557be23d
1 changed files with 14 additions and 18 deletions
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32
drivers/net/igb/igb_main.c
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@ -1801,25 +1801,21 @@ static void igb_setup_rctl(struct igb_adapter *adapter)
*/
rctl &= ~(E1000_RCTL_SBP | E1000_RCTL_LPE | E1000_RCTL_SZ_256);
if (adapter->netdev->mtu <= ETH_DATA_LEN) {
/* Setup buffer sizes */
switch (adapter->rx_buffer_len) {
case IGB_RXBUFFER_256:
rctl |= E1000_RCTL_SZ_256;
break;
case IGB_RXBUFFER_512:
rctl |= E1000_RCTL_SZ_512;
break;
case IGB_RXBUFFER_1024:
rctl |= E1000_RCTL_SZ_1024;
break;
default:
rctl |= E1000_RCTL_SZ_2048;
break;
}
} else {
if (adapter->netdev->mtu > ETH_DATA_LEN)
rctl |= E1000_RCTL_LPE;
srrctl = adapter->rx_buffer_len >> E1000_SRRCTL_BSIZEPKT_SHIFT;
/* Setup buffer sizes */
switch (adapter->rx_buffer_len) {
case IGB_RXBUFFER_256:
rctl |= E1000_RCTL_SZ_256;
break;
case IGB_RXBUFFER_512:
rctl |= E1000_RCTL_SZ_512;
break;
default:
srrctl = ALIGN(adapter->rx_buffer_len, 1024)
>> E1000_SRRCTL_BSIZEPKT_SHIFT;
break;
}
/* 82575 and greater support packet-split where the protocol