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igb: Add support for DMA_ATTR_WEAK_ORDERING 

Since we are already using DMA attributes in igb for Rx there is no reason
why we can't also apply DMA_ATTR_WEAK_ORDERING which is needed on some
platforms to improve performance.

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>
This commit is contained in:
Alexander Duyck 2017-02-06 18:25:26 -08:00 committed by Jeff Kirsher
parent fe723dff0f
commit 7bd1759282
2 changed files with 6 additions and 3 deletions
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3
drivers/net/ethernet/intel/igb/igb.h
View File

@ -148,6 +148,9 @@ struct vf_data_storage {
/* How many Rx Buffers do we bundle into one write to the hardware ? */
#define IGB_RX_BUFFER_WRITE 16 /* Must be power of 2 */
#define IGB_RX_DMA_ATTR \
(DMA_ATTR_SKIP_CPU_SYNC | DMA_ATTR_WEAK_ORDERING)
#define AUTO_ALL_MODES 0
#define IGB_EEPROM_APME 0x0400

6
drivers/net/ethernet/intel/igb/igb_main.c
View File

@ -3963,7 +3963,7 @@ static void igb_clean_rx_ring(struct igb_ring *rx_ring)
buffer_info->dma,
PAGE_SIZE,
DMA_FROM_DEVICE,
DMA_ATTR_SKIP_CPU_SYNC);
IGB_RX_DMA_ATTR);
__page_frag_cache_drain(buffer_info->page,
buffer_info->pagecnt_bias);
@ -6990,7 +6990,7 @@ static struct sk_buff *igb_fetch_rx_buffer(struct igb_ring *rx_ring,
*/
dma_unmap_page_attrs(rx_ring->dev, rx_buffer->dma,
PAGE_SIZE, DMA_FROM_DEVICE,
DMA_ATTR_SKIP_CPU_SYNC);
IGB_RX_DMA_ATTR);
__page_frag_cache_drain(page, rx_buffer->pagecnt_bias);
}
@ -7250,7 +7250,7 @@ static bool igb_alloc_mapped_page(struct igb_ring *rx_ring,
/* map page for use */
dma = dma_map_page_attrs(rx_ring->dev, page, 0, PAGE_SIZE,
DMA_FROM_DEVICE, DMA_ATTR_SKIP_CPU_SYNC);
DMA_FROM_DEVICE, IGB_RX_DMA_ATTR);
/* if mapping failed free memory back to system since
* there isn't much point in holding memory we can't use