mirror of https://gitee.com/openkylin/linux.git
igb: Lock buffer size at 2K even on systems with larger pages
This change locks us in at 2K buffers even on a system that supports larger frames. The reason for this change is to make better use of pages and to reduce the overall truesize of frames generated by igb. Signed-off-by: Alexander Duyck <alexander.h.duyck@intel.com> Tested-by: Aaron Brown <aaron.f.brown@intel.com> Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
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@ -132,9 +132,10 @@ struct vf_data_storage {
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#define MAXIMUM_ETHERNET_VLAN_SIZE 1522
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/* Supported Rx Buffer Sizes */
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#define IGB_RXBUFFER_256 256
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#define IGB_RXBUFFER_16384 16384
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#define IGB_RX_HDR_LEN IGB_RXBUFFER_256
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#define IGB_RXBUFFER_256 256
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#define IGB_RXBUFFER_2048 2048
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#define IGB_RX_HDR_LEN IGB_RXBUFFER_256
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#define IGB_RX_BUFSZ IGB_RXBUFFER_2048
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/* How many Tx Descriptors do we need to call netif_wake_queue ? */
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#define IGB_TX_QUEUE_WAKE 16
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@ -1727,7 +1727,7 @@ static int igb_clean_test_rings(struct igb_ring *rx_ring,
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/* sync Rx buffer for CPU read */
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dma_sync_single_for_cpu(rx_ring->dev,
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rx_buffer_info->dma,
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PAGE_SIZE / 2,
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IGB_RX_BUFSZ,
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DMA_FROM_DEVICE);
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/* verify contents of skb */
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@ -1737,7 +1737,7 @@ static int igb_clean_test_rings(struct igb_ring *rx_ring,
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/* sync Rx buffer for device write */
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dma_sync_single_for_device(rx_ring->dev,
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rx_buffer_info->dma,
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PAGE_SIZE / 2,
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IGB_RX_BUFSZ,
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DMA_FROM_DEVICE);
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/* unmap buffer on tx side */
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@ -554,7 +554,7 @@ static void igb_dump(struct igb_adapter *adapter)
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16, 1,
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page_address(buffer_info->page) +
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buffer_info->page_offset,
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PAGE_SIZE/2, true);
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IGB_RX_BUFSZ, true);
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}
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}
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}
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@ -3103,11 +3103,7 @@ void igb_configure_rx_ring(struct igb_adapter *adapter,
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/* set descriptor configuration */
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srrctl = IGB_RX_HDR_LEN << E1000_SRRCTL_BSIZEHDRSIZE_SHIFT;
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#if (PAGE_SIZE / 2) > IGB_RXBUFFER_16384
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srrctl |= IGB_RXBUFFER_16384 >> E1000_SRRCTL_BSIZEPKT_SHIFT;
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#else
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srrctl |= (PAGE_SIZE / 2) >> E1000_SRRCTL_BSIZEPKT_SHIFT;
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#endif
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srrctl |= IGB_RX_BUFSZ >> E1000_SRRCTL_BSIZEPKT_SHIFT;
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srrctl |= E1000_SRRCTL_DESCTYPE_ADV_ONEBUF;
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#ifdef CONFIG_IGB_PTP
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if (hw->mac.type >= e1000_82580)
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@ -5855,7 +5851,7 @@ static void igb_reuse_rx_page(struct igb_ring *rx_ring,
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/* sync the buffer for use by the device */
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dma_sync_single_range_for_device(rx_ring->dev, old_buff->dma,
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old_buff->page_offset,
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PAGE_SIZE / 2,
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IGB_RX_BUFSZ,
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DMA_FROM_DEVICE);
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}
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@ -5905,18 +5901,19 @@ static bool igb_add_rx_frag(struct igb_ring *rx_ring,
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}
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skb_add_rx_frag(skb, skb_shinfo(skb)->nr_frags, page,
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rx_buffer->page_offset, size, PAGE_SIZE / 2);
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rx_buffer->page_offset, size, IGB_RX_BUFSZ);
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/* avoid re-using remote pages */
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if (unlikely(page_to_nid(page) != numa_node_id()))
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return false;
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#if (PAGE_SIZE < 8192)
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/* if we are only owner of page we can reuse it */
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if (unlikely(page_count(page) != 1))
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return false;
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/* flip page offset to other buffer */
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rx_buffer->page_offset ^= PAGE_SIZE / 2;
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rx_buffer->page_offset ^= IGB_RX_BUFSZ;
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/*
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* since we are the only owner of the page and we need to
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@ -5924,6 +5921,16 @@ static bool igb_add_rx_frag(struct igb_ring *rx_ring,
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* an unnecessary locked operation
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*/
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atomic_set(&page->_count, 2);
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#else
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/* move offset up to the next cache line */
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rx_buffer->page_offset += SKB_DATA_ALIGN(size);
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if (rx_buffer->page_offset > (PAGE_SIZE - IGB_RX_BUFSZ))
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return false;
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/* bump ref count on page before it is given to the stack */
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get_page(page);
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#endif
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return true;
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}
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@ -5977,7 +5984,7 @@ static struct sk_buff *igb_fetch_rx_buffer(struct igb_ring *rx_ring,
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dma_sync_single_range_for_cpu(rx_ring->dev,
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rx_buffer->dma,
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rx_buffer->page_offset,
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PAGE_SIZE / 2,
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IGB_RX_BUFSZ,
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DMA_FROM_DEVICE);
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/* pull page into skb */
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