netdev - [PATCH net-next V2 4/9] eth: fbnic: Prefetch packet headers on Rx

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Message-ID: <20250811215457.1053688-1-mohsin.bashr@gmail.com>
Date: Mon, 11 Aug 2025 14:54:57 -0700
From: Mohsin Bashir <mohsin.bashr@...il.com>
To: netdev@...r.kernel.org
Cc: kuba@...nel.org,
	alexanderduyck@...com,
	andrew+netdev@...n.ch,
	ast@...nel.org,
	bpf@...r.kernel.org,
	corbet@....net,
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	davem@...emloft.net,
	edumazet@...gle.com,
	hawk@...nel.org,
	horms@...nel.org,
	john.fastabend@...il.com,
	kernel-team@...a.com,
	mohsin.bashr@...il.com,
	pabeni@...hat.com,
	sdf@...ichev.me,
	vadim.fedorenko@...ux.dev,
	aleksander.lobakin@...el.com
Subject: [PATCH net-next V2 4/9] eth: fbnic: Prefetch packet headers on Rx

Issue a prefetch for the start of the buffer on Rx to try to avoid cache
miss on packet headers.

Signed-off-by: Jakub Kicinski <kuba@...nel.org>
Signed-off-by: Mohsin Bashir <mohsin.bashr@...il.com>
---
 drivers/net/ethernet/meta/fbnic/fbnic_txrx.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/meta/fbnic/fbnic_txrx.c b/drivers/net/ethernet/meta/fbnic/fbnic_txrx.c
index 819234aa5bd4..7945f695b6f2 100644
--- a/drivers/net/ethernet/meta/fbnic/fbnic_txrx.c
+++ b/drivers/net/ethernet/meta/fbnic/fbnic_txrx.c
@@ -888,7 +888,7 @@ static void fbnic_pkt_prepare(struct fbnic_napi_vector *nv, u64 rcd,
 
 	/* Build frame around buffer */
 	hdr_start = page_address(page) + hdr_pg_start;
-
+	net_prefetch(pkt->buff.data);
 	xdp_prepare_buff(&pkt->buff, hdr_start, headroom,
 			 len - FBNIC_RX_PAD, true);
 
-- 
2.47.3