ixgbevf: Reduce size of maximum rx buffer
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>
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@ -101,10 +101,10 @@ struct ixgbevf_ring {
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/* Supported Rx Buffer Sizes */
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#define IXGBEVF_RXBUFFER_256 256 /* Used for packet split */
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#define IXGBEVF_RXBUFFER_3K 3072
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#define IXGBEVF_RXBUFFER_7K 7168
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#define IXGBEVF_RXBUFFER_15K 15360
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#define IXGBEVF_MAX_RXBUFFER 16384 /* largest size for single descriptor */
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#define IXGBEVF_RXBUFFER_2K 2048
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#define IXGBEVF_RXBUFFER_4K 4096
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#define IXGBEVF_RXBUFFER_8K 8192
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#define IXGBEVF_RXBUFFER_10K 10240
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#define IXGBEVF_RX_HDR_SIZE IXGBEVF_RXBUFFER_256
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@ -1087,20 +1087,20 @@ static void ixgbevf_set_rx_buffer_len(struct ixgbevf_adapter *adapter)
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max_frame += VLAN_HLEN;
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/*
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* Make best use of allocation by using all but 1K of a
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* power of 2 allocation that will be used for skb->head.
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* Allocate buffer sizes that fit well into 32K and
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* take into account max frame size of 9.5K
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*/
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if ((hw->mac.type == ixgbe_mac_X540_vf) &&
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(max_frame <= MAXIMUM_ETHERNET_VLAN_SIZE))
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rx_buf_len = MAXIMUM_ETHERNET_VLAN_SIZE;
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else if (max_frame <= IXGBEVF_RXBUFFER_3K)
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rx_buf_len = IXGBEVF_RXBUFFER_3K;
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else if (max_frame <= IXGBEVF_RXBUFFER_7K)
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rx_buf_len = IXGBEVF_RXBUFFER_7K;
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else if (max_frame <= IXGBEVF_RXBUFFER_15K)
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rx_buf_len = IXGBEVF_RXBUFFER_15K;
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else if (max_frame <= IXGBEVF_RXBUFFER_2K)
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rx_buf_len = IXGBEVF_RXBUFFER_2K;
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else if (max_frame <= IXGBEVF_RXBUFFER_4K)
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rx_buf_len = IXGBEVF_RXBUFFER_4K;
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else if (max_frame <= IXGBEVF_RXBUFFER_8K)
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rx_buf_len = IXGBEVF_RXBUFFER_8K;
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else
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rx_buf_len = IXGBEVF_MAX_RXBUFFER;
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rx_buf_len = IXGBEVF_RXBUFFER_10K;
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for (i = 0; i < adapter->num_rx_queues; i++)
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adapter->rx_ring[i].rx_buf_len = rx_buf_len;
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