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net: stmmac: Optimize cache prefetch in RX path

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Current code prefetches cache lines for the received frame first, and
then dma_sync_single_for_cpu() against this frame, this is wrong.
Cache prefetch should be triggered after dma_sync_single_for_cpu().

This patch brings ~2.8% driver performance improvement in a TCP RX
throughput test with iPerf tool on a single isolated Cortex-A65 CPU
core, 2.84 Gbits/sec increased to 2.92 Gbits/sec.

Signed-off-by: Furong Xu <0x1207@gmail.com>
Reviewed-by: Alexander Lobakin <aleksander.lobakin@intel.com>
Reviewed-by: Yanteng Si <si.yanteng@linux.dev>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
This commit is contained in:
Furong Xu 2025-01-15 11:27:04 +08:00 committed by Paolo Abeni
parent 2324c78a75
commit 2a2931517c
1 changed files with 1 additions and 4 deletions
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5
drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
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@ -5508,10 +5508,6 @@ static int stmmac_rx(struct stmmac_priv *priv, int limit, u32 queue)
/* Buffer is good. Go on. */
prefetch(page_address(buf->page) + buf->page_offset);
if (buf->sec_page)
prefetch(page_address(buf->sec_page));
buf1_len = stmmac_rx_buf1_len(priv, p, status, len);
len += buf1_len;
buf2_len = stmmac_rx_buf2_len(priv, p, status, len);
@ -5533,6 +5529,7 @@ 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);
xdp_init_buff(&ctx.xdp, buf_sz, &rx_q->xdp_rxq);
xdp_prepare_buff(&ctx.xdp, page_address(buf->page),