sfc: Explicitly prefetch RX hash prefix, not just Ethernet heade (5036b7c7) · Commits · 戴 / test

Currently we prefetch from the Ethernet header, but we will also read the hash prefix. In practice they should be in the same cache line and this won't hurt, but it is still pointless to add on the hash prefix size. Signed-off-by:

Ben Hutchings <bhutchings@solarflare.com>

drivers/net/ethernet/sfc/rx.c

+1 −1

Original line number	Original line	Diff line number	Diff line
	@@ -458,7 +458,7 @@ void efx_rx_packet(struct efx_rx_queue *rx_queue, unsigned int index,
	/* Prefetch nice and early so data will (hopefully) be in cache by		/* Prefetch nice and early so data will (hopefully) be in cache by
	* the time we look at it.		* the time we look at it.
	*/		*/
	prefetch(efx_rx_buf_va(rx_buf) + efx->type->rx_buffer_hash_size);		prefetch(efx_rx_buf_va(rx_buf));

	/* Pipeline receives so that we give time for packet headers to be		/* Pipeline receives so that we give time for packet headers to be
	* prefetched into cache.		* prefetched into cache.

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