netdev - [PATCH bpf 6/6] net: enetc: use truesize as XDP RxQ info frag

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Message-ID: <20260203105417.2302672-7-larysa.zaremba@intel.com>
Date: Tue,  3 Feb 2026 11:53:34 +0100
From: Larysa Zaremba <larysa.zaremba@...el.com>
To: bpf@...r.kernel.org
Cc: Claudiu Manoil <claudiu.manoil@....com>,
	Vladimir Oltean <vladimir.oltean@....com>,
	Wei Fang <wei.fang@....com>,
	Clark Wang <xiaoning.wang@....com>,
	Andrew Lunn <andrew+netdev@...n.ch>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>,
	Tony Nguyen <anthony.l.nguyen@...el.com>,
	Przemek Kitszel <przemyslaw.kitszel@...el.com>,
	Alexei Starovoitov <ast@...nel.org>,
	Daniel Borkmann <daniel@...earbox.net>,
	Jesper Dangaard Brouer <hawk@...nel.org>,
	John Fastabend <john.fastabend@...il.com>,
	Stanislav Fomichev <sdf@...ichev.me>,
	Andrii Nakryiko <andrii@...nel.org>,
	Martin KaFai Lau <martin.lau@...ux.dev>,
	Eduard Zingerman <eddyz87@...il.com>,
	Song Liu <song@...nel.org>,
	Yonghong Song <yonghong.song@...ux.dev>,
	KP Singh <kpsingh@...nel.org>,
	Hao Luo <haoluo@...gle.com>,
	Jiri Olsa <jolsa@...nel.org>,
	Simon Horman <horms@...nel.org>,
	Shuah Khan <shuah@...nel.org>,
	Alexander Lobakin <aleksander.lobakin@...el.com>,
	Maciej Fijalkowski <maciej.fijalkowski@...el.com>,
	"Bastien Curutchet (eBPF Foundation)" <bastien.curutchet@...tlin.com>,
	Larysa Zaremba <larysa.zaremba@...el.com>,
	Tushar Vyavahare <tushar.vyavahare@...el.com>,
	Jason Xing <kernelxing@...cent.com>,
	Ricardo B. Marlière <rbm@...e.com>,
	Eelco Chaudron <echaudro@...hat.com>,
	Lorenzo Bianconi <lorenzo@...nel.org>,
	Toke Hoiland-Jorgensen <toke@...hat.com>,
	imx@...ts.linux.dev,
	netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	intel-wired-lan@...ts.osuosl.org,
	linux-kselftest@...r.kernel.org,
	Aleksandr Loktionov <aleksandr.loktionov@...el.com>
Subject: [PATCH bpf 6/6] net: enetc: use truesize as XDP RxQ info frag_size

The only user of frag_size field in XDP RxQ info is
bpf_xdp_frags_increase_tail(). It clearly expects truesize instead of DMA
write size. Different assumptions in enetc driver configuration lead to
negative tailroom.

Set frag_size to the same value as frame_sz.

Fixes: 2768b2e2f7d2 ("net: enetc: register XDP RX queues with frag_size")
Reviewed-by: Aleksandr Loktionov <aleksandr.loktionov@...el.com>
Signed-off-by: Larysa Zaremba <larysa.zaremba@...el.com>
---
 drivers/net/ethernet/freescale/enetc/enetc.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/freescale/enetc/enetc.c b/drivers/net/ethernet/freescale/enetc/enetc.c
index 53b26cece16a..389331571d9e 100644
--- a/drivers/net/ethernet/freescale/enetc/enetc.c
+++ b/drivers/net/ethernet/freescale/enetc/enetc.c
@@ -3465,7 +3465,7 @@ static int enetc_int_vector_init(struct enetc_ndev_priv *priv, int i,
 	priv->rx_ring[i] = bdr;
 
 	err = __xdp_rxq_info_reg(&bdr->xdp.rxq, priv->ndev, i, 0,
-				 ENETC_RXB_DMA_SIZE_XDP);
+				 ENETC_RXB_TRUESIZE);
 	if (err)
 		goto free_vector;
 
-- 
2.52.0