diff mbox series

[net,v2,2/3] dpaa_eth: reduce data alignment requirements for the A050385 erratum

Message ID 07da2fe94891ddaeed1140544a7c6ffa156a6711.1612456902.git.camelia.groza@nxp.com
State New
Headers show
Series [net,v2,1/3] dpaa_eth: reserve space for the xdp_frame under the A050385 erratum | expand

Commit Message

Camelia Alexandra Groza Feb. 4, 2021, 4:49 p.m. UTC 
The 256 byte data alignment is required for preventing DMA transaction
splits when crossing 4K page boundaries. Since XDP deals only with page
sized buffers or less, this restriction isn't needed. Instead, the data
only needs to be aligned to 64 bytes to prevent DMA transaction splits.

These lessened restrictions can increase performance by widening the pool
of permitted data alignments and preventing unnecessary realignments.

Fixes: ae680bcbd06a ("dpaa_eth: implement the A050385 erratum workaround for XDP")
Signed-off-by: Camelia Groza <camelia.groza@nxp.com>
Acked-by: Maciej Fijalkowski <maciej.fijalkowski@intel.com>
---
 drivers/net/ethernet/freescale/dpaa/dpaa_eth.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
diff mbox series

Patch

diff --git a/drivers/net/ethernet/freescale/dpaa/dpaa_eth.c b/drivers/net/ethernet/freescale/dpaa/dpaa_eth.c
index f3a879937d8d..2a2c7db23407 100644
--- a/drivers/net/ethernet/freescale/dpaa/dpaa_eth.c
+++ b/drivers/net/ethernet/freescale/dpaa/dpaa_eth.c
@@ -2192,7 +2192,7 @@  static int dpaa_a050385_wa_xdpf(struct dpaa_priv *priv,
 	 * byte frame headroom. If the XDP program uses all of it, copy the
 	 * data to a new buffer and make room for storing the backpointer.
 	 */
-	if (PTR_IS_ALIGNED(xdpf->data, DPAA_A050385_ALIGN) &&
+	if (PTR_IS_ALIGNED(xdpf->data, DPAA_FD_DATA_ALIGNMENT) &&
 	    xdpf->headroom >= priv->tx_headroom) {
 		xdpf->headroom = priv->tx_headroom;
 		return 0;