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[Deepin-Kernel-SIG] [Upstream] [linux 6.6-y] net: stmmac: Convert prefetch() to net_prefetch() for rece… #578

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Jan 25, 2025
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[Deepin-Kernel-SIG] [Upstream] [linux 6.6-y] net: stmmac: Convert prefetch() to net_prefetch() for rece… #578

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d3174e3
Revert "[FROMLIST] net: stmmac: Optimize cache prefetch in RX path"
opsiff Jan 24, 2025
ec3de84
net: stmmac: Optimize cache prefetch in RX path
Jan 15, 2025
cc4d190
net: stmmac: Convert prefetch() to net_prefetch() for received frames
Jan 15, 2025
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net: stmmac: Convert prefetch() to net_prefetch() for received frames 
mainline inclusion
from mainline-v6.14-rc1
category: performance

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: Joe Damato <[email protected]>
Signed-off-by: Furong Xu <[email protected]>
Reviewed-by: Yanteng Si <[email protected]>
Reviewed-by: Larysa Zaremba <[email protected]>
Reviewed-by: Joe Damato <[email protected]>
Signed-off-by: Paolo Abeni <[email protected]>

(cherry picked from commit 204182edb3107f87a40f34affb3de8851e1c5d68)
Signed-off-by: Wentao Guan <[email protected]>
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@opsiff
Furong Xu authored and opsiff committed Jan 24, 2025
commit cc4d1907a49b74a35ee3d3fea16d630128049a06
3 changes: 2 additions & 1 deletion drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
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Original file line number Diff line number Diff line change
Expand Up @@ -5429,7 +5429,8 @@ 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),
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