From c2b0e8455eb76135f505dda81a8869e60f37a861 Mon Sep 17 00:00:00 2001 From: Camelia Groza Date: Thu, 4 Feb 2021 18:49:27 +0200 Subject: dpaa_eth: reduce data alignment requirements for the A050385 erratum 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 Acked-by: Maciej Fijalkowski Acked-by: Madalin Bucur Signed-off-by: Jakub Kicinski --- drivers/net/ethernet/freescale/dpaa/dpaa_eth.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'drivers/net/ethernet/freescale/dpaa') 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; -- cgit