Commit 204182ed authored by Furong Xu's avatar Furong Xu Committed by Paolo Abeni
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net: stmmac: Convert prefetch() to net_prefetch() for received frames 



The size of DMA descriptors is 32 bytes at most.
net_prefetch() for received frames, and keep prefetch() for descriptors.

This patch brings ~4.8% driver performance improvement in a TCP RX
throughput test with iPerf tool on a single isolated Cortex-A65 CPU
core, 2.92 Gbits/sec increased to 3.06 Gbits/sec.

Suggested-by: default avatarJoe Damato <jdamato@fastly.com>
Signed-off-by: default avatarFurong Xu <0x1207@gmail.com>
Reviewed-by: default avatarYanteng Si <si.yanteng@linux.dev>
Reviewed-by: default avatarLarysa Zaremba <larysa.zaremba@intel.com>
Reviewed-by: default avatarJoe Damato <jdamato@fastly.com>
Signed-off-by: default avatarPaolo Abeni <pabeni@redhat.com>
parent 2a293151

drivers/net/ethernet/stmicro/stmmac/stmmac_main.c

+2 −1
Original line number Diff line number Diff line
@@ -5529,7 +5529,8 @@ static int stmmac_rx(struct stmmac_priv *priv, int limit, u32 queue) 


			dma_sync_single_for_cpu(priv->device, buf->addr,

						buf1_len, dma_dir);

			prefetch(page_address(buf->page) + buf->page_offset);

			net_prefetch(page_address(buf->page) +

				     buf->page_offset);



			xdp_init_buff(&ctx.xdp, buf_sz, &rx_q->xdp_rxq);

			xdp_prepare_buff(&ctx.xdp, page_address(buf->page),