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>
diff --git a/drivers/net/igb/igb_main.c b/drivers/net/igb/igb_main.c
index c49b8d8..dad742f 100644
--- a/drivers/net/igb/igb_main.c
+++ b/drivers/net/igb/igb_main.c
@@ -1801,25 +1801,21 @@
*/
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