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Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Pavan Kumar Linga , Phani Burra , Willem de Bruijn , Alan Brady , Sridhar Samudrala , Joshua Hay , intel-wired-lan@lists.osuosl.org, linux-kernel@vger.kernel.org Subject: [PATCH net] idpf: Fix data race in idpf_net_dim Date: Tue, 20 Jan 2026 00:27:16 +0800 Message-ID: <20260119162720.1463859-1-mmyangfl@gmail.com> X-Mailer: git-send-email 2.51.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" In idpf_net_dim(), some statistics protected by u64_stats_sync, are read and accumulated in ignorance of possible u64_stats_fetch_retry() events. The correct way to copy statistics is already illustrated by idpf_add_queue_stats(). Fix this by reading them into temporary variables first. Fixes: c2d548cad150 ("idpf: add TX splitq napi poll support") Fixes: 3a8845af66ed ("idpf: add RX splitq napi poll support") Signed-off-by: David Yang Reviewed-by: Aleksandr Loktionov Reviewed-by: Eric Dumazet --- drivers/net/ethernet/intel/idpf/idpf_txrx.c | 16 +++++++++++----- 1 file changed, 11 insertions(+), 5 deletions(-) diff --git a/drivers/net/ethernet/intel/idpf/idpf_txrx.c b/drivers/net/ethe= rnet/intel/idpf/idpf_txrx.c index 97a5fe766b6b..66ba645e8b90 100644 --- a/drivers/net/ethernet/intel/idpf/idpf_txrx.c +++ b/drivers/net/ethernet/intel/idpf/idpf_txrx.c @@ -3956,7 +3956,7 @@ static void idpf_update_dim_sample(struct idpf_q_vect= or *q_vector, static void idpf_net_dim(struct idpf_q_vector *q_vector) { struct dim_sample dim_sample =3D { }; - u64 packets, bytes; + u64 packets, bytes, pkts, bts; u32 i; =20 if (!IDPF_ITR_IS_DYNAMIC(q_vector->tx_intr_mode)) @@ -3968,9 +3968,12 @@ static void idpf_net_dim(struct idpf_q_vector *q_vec= tor) =20 do { start =3D u64_stats_fetch_begin(&txq->stats_sync); - packets +=3D u64_stats_read(&txq->q_stats.packets); - bytes +=3D u64_stats_read(&txq->q_stats.bytes); + pkts =3D u64_stats_read(&txq->q_stats.packets); + bts =3D u64_stats_read(&txq->q_stats.bytes); } while (u64_stats_fetch_retry(&txq->stats_sync, start)); + + packets +=3D pkts; + bytes +=3D bts; } =20 idpf_update_dim_sample(q_vector, &dim_sample, &q_vector->tx_dim, @@ -3987,9 +3990,12 @@ static void idpf_net_dim(struct idpf_q_vector *q_vec= tor) =20 do { start =3D u64_stats_fetch_begin(&rxq->stats_sync); - packets +=3D u64_stats_read(&rxq->q_stats.packets); - bytes +=3D u64_stats_read(&rxq->q_stats.bytes); + pkts =3D u64_stats_read(&rxq->q_stats.packets); + bts =3D u64_stats_read(&rxq->q_stats.bytes); } while (u64_stats_fetch_retry(&rxq->stats_sync, start)); + + packets +=3D pkts; + bytes +=3D bts; } =20 idpf_update_dim_sample(q_vector, &dim_sample, &q_vector->rx_dim, --=20 2.51.0