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igb: increase minimum rx buffer size to 1K

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This update increases the minimum rx buffer size to 1K.  The reason for this
change is to support SR-IOV and avoid any conflicts with the rings being able
to set their own MTU sizes.

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 2009-10-27 15:50:08 +00:00 committed by David S. Miller
parent 094919a4b0
commit 7d95b7170e
2 changed files with 3 additions and 24 deletions
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2
drivers/net/igb/igb.h
View File

@ -96,8 +96,6 @@ struct vf_data_storage {
/* Supported Rx Buffer Sizes */
#define IGB_RXBUFFER_128 128 /* Used for packet split */
#define IGB_RXBUFFER_256 256 /* Used for packet split */
#define IGB_RXBUFFER_512 512
#define IGB_RXBUFFER_1024 1024
#define IGB_RXBUFFER_2048 2048
#define IGB_RXBUFFER_16384 16384

25
drivers/net/igb/igb_main.c
View File

@ -2233,18 +2233,8 @@ static void igb_setup_rctl(struct igb_adapter *adapter)
rctl |= E1000_RCTL_LPE;
/* 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;
}
srrctl = ALIGN(adapter->rx_buffer_len, 1024)
>> E1000_SRRCTL_BSIZEPKT_SHIFT;
/* 82575 and greater support packet-split where the protocol
* header is placed in skb->data and the packet data is
@ -3755,11 +3745,7 @@ static int igb_change_mtu(struct net_device *netdev, int new_mtu)
* i.e. RXBUFFER_2048 --> size-4096 slab
*/
if (max_frame <= IGB_RXBUFFER_256)
adapter->rx_buffer_len = IGB_RXBUFFER_256;
else if (max_frame <= IGB_RXBUFFER_512)
adapter->rx_buffer_len = IGB_RXBUFFER_512;
else if (max_frame <= IGB_RXBUFFER_1024)
if (max_frame <= IGB_RXBUFFER_1024)
adapter->rx_buffer_len = IGB_RXBUFFER_1024;
else if (max_frame <= IGB_RXBUFFER_2048)
adapter->rx_buffer_len = IGB_RXBUFFER_2048;
@ -3770,11 +3756,6 @@ static int igb_change_mtu(struct net_device *netdev, int new_mtu)
adapter->rx_buffer_len = PAGE_SIZE / 2;
#endif
/* if sr-iov is enabled we need to force buffer size to 1K or larger */
if (adapter->vfs_allocated_count &&
(adapter->rx_buffer_len < IGB_RXBUFFER_1024))
adapter->rx_buffer_len = IGB_RXBUFFER_1024;
/* adjust allocation if LPE protects us, and we aren't using SBP */
if ((max_frame == ETH_FRAME_LEN + ETH_FCS_LEN) ||
(max_frame == MAXIMUM_ETHERNET_VLAN_SIZE))