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From: Mohsin Bashir <mohsin.bashr@gmail.com>
To: netdev@vger.kernel.org
Cc: aleksander.lobakin@intel.com, alexanderduyck@fb.com,
	andrew+netdev@lunn.ch, ast@kernel.org, bpf@vger.kernel.org,
	corbet@lwn.net, daniel@iogearbox.net, davem@davemloft.net,
	edumazet@google.com, hawk@kernel.org, horms@kernel.org,
	john.fastabend@gmail.com, kernel-team@meta.com, kuba@kernel.org,
	linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org,
	mohsin.bashr@gmail.com, pabeni@redhat.com, sdf@fomichev.me,
	vadim.fedorenko@linux.dev
Subject: [PATCH net-next V4 4/9] eth: fbnic: Prefetch packet headers on Rx
Date: Wed, 13 Aug 2025 15:13:14 -0700	[thread overview]
Message-ID: <20250813221319.3367670-5-mohsin.bashr@gmail.com> (raw)
In-Reply-To: <20250813221319.3367670-1-mohsin.bashr@gmail.com>

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@kernel.org>
Signed-off-by: Mohsin Bashir <mohsin.bashr@gmail.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 2adbe175ac09..65d1e40addec 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


  parent reply	other threads:[~2025-08-13 22:13 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2025-08-13 22:13 [PATCH net-next V4 0/9] eth: fbnic: Add XDP support for fbnic Mohsin Bashir
2025-08-13 22:13 ` [PATCH net-next V4 1/9] eth: fbnic: Add support for HDS configuration Mohsin Bashir
2025-08-13 22:13 ` [PATCH net-next V4 2/9] eth: fbnic: Update Headroom Mohsin Bashir
2025-08-13 22:13 ` [PATCH net-next V4 3/9] eth: fbnic: Use shinfo to track frags state on Rx Mohsin Bashir
2025-08-13 22:13 ` Mohsin Bashir [this message]
2025-08-13 22:13 ` [PATCH net-next V4 5/9] eth: fbnic: Add XDP pass, drop, abort support Mohsin Bashir
2025-08-21 12:52   ` Dan Carpenter
2025-08-13 22:13 ` [PATCH net-next V4 6/9] eth: fbnic: Add support for XDP queues Mohsin Bashir
2025-08-13 22:13 ` [PATCH net-next V4 7/9] eth: fbnic: Add support for XDP_TX action Mohsin Bashir
2025-08-13 22:13 ` [PATCH net-next V4 8/9] eth: fbnic: Collect packet statistics for XDP Mohsin Bashir
2025-08-13 22:13 ` [PATCH net-next V4 9/9] eth: fbnic: Report XDP stats via ethtool Mohsin Bashir
2025-08-19  9:20 ` [PATCH net-next V4 0/9] eth: fbnic: Add XDP support for fbnic patchwork-bot+netdevbpf

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