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ixgbevf: Reduce size of maximum rx buffer

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There's no need to support up to 15k buffers since the HW is limited to
9.5k in SR-IOV mode.  Instead, allocate buffers that fit and align inside
of a 32K memory buffer.

Signed-off-by: Greg Rose <gregory.v.rose@intel.com>
Tested-by: Sibai Li <sibai.li@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:
Greg Rose 2012-11-13 04:03:19 +00:00 committed by David S. Miller
parent 366c109912
commit 85624caff9
2 changed files with 13 additions and 13 deletions
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8
drivers/net/ethernet/intel/ixgbevf/ixgbevf.h
View File

@ -101,10 +101,10 @@ struct ixgbevf_ring {
/* Supported Rx Buffer Sizes */
#define IXGBEVF_RXBUFFER_256 256 /* Used for packet split */
#define IXGBEVF_RXBUFFER_3K 3072
#define IXGBEVF_RXBUFFER_7K 7168
#define IXGBEVF_RXBUFFER_15K 15360
#define IXGBEVF_MAX_RXBUFFER 16384 /* largest size for single descriptor */
#define IXGBEVF_RXBUFFER_2K 2048
#define IXGBEVF_RXBUFFER_4K 4096
#define IXGBEVF_RXBUFFER_8K 8192
#define IXGBEVF_RXBUFFER_10K 10240
#define IXGBEVF_RX_HDR_SIZE IXGBEVF_RXBUFFER_256

18
drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c
View File

@ -1087,20 +1087,20 @@ static void ixgbevf_set_rx_buffer_len(struct ixgbevf_adapter *adapter)
max_frame += VLAN_HLEN;
/*
* Make best use of allocation by using all but 1K of a
* power of 2 allocation that will be used for skb->head.
* Allocate buffer sizes that fit well into 32K and
* take into account max frame size of 9.5K
*/
if ((hw->mac.type == ixgbe_mac_X540_vf) &&
(max_frame <= MAXIMUM_ETHERNET_VLAN_SIZE))
rx_buf_len = MAXIMUM_ETHERNET_VLAN_SIZE;
else if (max_frame <= IXGBEVF_RXBUFFER_3K)
rx_buf_len = IXGBEVF_RXBUFFER_3K;
else if (max_frame <= IXGBEVF_RXBUFFER_7K)
rx_buf_len = IXGBEVF_RXBUFFER_7K;
else if (max_frame <= IXGBEVF_RXBUFFER_15K)
rx_buf_len = IXGBEVF_RXBUFFER_15K;
else if (max_frame <= IXGBEVF_RXBUFFER_2K)
rx_buf_len = IXGBEVF_RXBUFFER_2K;
else if (max_frame <= IXGBEVF_RXBUFFER_4K)
rx_buf_len = IXGBEVF_RXBUFFER_4K;
else if (max_frame <= IXGBEVF_RXBUFFER_8K)
rx_buf_len = IXGBEVF_RXBUFFER_8K;
else
rx_buf_len = IXGBEVF_MAX_RXBUFFER;
rx_buf_len = IXGBEVF_RXBUFFER_10K;
for (i = 0; i < adapter->num_rx_queues; i++)
adapter->rx_ring[i].rx_buf_len = rx_buf_len;