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Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Vadim Fedorenko , Kory Maincent , Jacob Keller , Nishanth Menon , linux-kernel@vger.kernel.org Subject: [PATCH net-next] net: ethernet: ti: netcp: Use u64_stats_t with u64_stats_sync properly Date: Sat, 24 Jan 2026 00:48:36 +0800 Message-ID: <20260123164841.2890054-1-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" On 64bit arches, struct u64_stats_sync is empty and provides no help against load/store tearing. Convert to u64_stats_t to ensure atomic operations. Note that does not mean the code is now tear-free: there're u32 counters unprotected by u64_stats or anything else. Signed-off-by: David Yang --- drivers/net/ethernet/ti/netcp.h | 8 ++++---- drivers/net/ethernet/ti/netcp_core.c | 16 ++++++++-------- 2 files changed, 12 insertions(+), 12 deletions(-) diff --git a/drivers/net/ethernet/ti/netcp.h b/drivers/net/ethernet/ti/netc= p.h index b9cbd3b4a8a2..9cfddaa807e2 100644 --- a/drivers/net/ethernet/ti/netcp.h +++ b/drivers/net/ethernet/ti/netcp.h @@ -65,14 +65,14 @@ struct netcp_addr { =20 struct netcp_stats { struct u64_stats_sync syncp_rx ____cacheline_aligned_in_smp; - u64 rx_packets; - u64 rx_bytes; + u64_stats_t rx_packets; + u64_stats_t rx_bytes; u32 rx_errors; u32 rx_dropped; =20 struct u64_stats_sync syncp_tx ____cacheline_aligned_in_smp; - u64 tx_packets; - u64 tx_bytes; + u64_stats_t tx_packets; + u64_stats_t tx_bytes; u32 tx_errors; u32 tx_dropped; }; diff --git a/drivers/net/ethernet/ti/netcp_core.c b/drivers/net/ethernet/ti= /netcp_core.c index 5ed1c46bbcb1..eb8fc2ed05f4 100644 --- a/drivers/net/ethernet/ti/netcp_core.c +++ b/drivers/net/ethernet/ti/netcp_core.c @@ -759,8 +759,8 @@ static int netcp_process_one_rx_packet(struct netcp_int= f *netcp) knav_pool_desc_put(netcp->rx_pool, desc); =20 u64_stats_update_begin(&rx_stats->syncp_rx); - rx_stats->rx_packets++; - rx_stats->rx_bytes +=3D skb->len; + u64_stats_inc(&rx_stats->rx_packets); + u64_stats_add(&rx_stats->rx_bytes, skb->len); u64_stats_update_end(&rx_stats->syncp_rx); =20 /* push skb up the stack */ @@ -1045,8 +1045,8 @@ static int netcp_process_tx_compl_packets(struct netc= p_intf *netcp, } =20 u64_stats_update_begin(&tx_stats->syncp_tx); - tx_stats->tx_packets++; - tx_stats->tx_bytes +=3D skb->len; + u64_stats_inc(&tx_stats->tx_packets); + u64_stats_add(&tx_stats->tx_bytes, skb->len); u64_stats_update_end(&tx_stats->syncp_tx); dev_kfree_skb(skb); pkts++; @@ -1973,14 +1973,14 @@ netcp_get_stats(struct net_device *ndev, struct rtn= l_link_stats64 *stats) =20 do { start =3D u64_stats_fetch_begin(&p->syncp_rx); - rxpackets =3D p->rx_packets; - rxbytes =3D p->rx_bytes; + rxpackets =3D u64_stats_read(&p->rx_packets); + rxbytes =3D u64_stats_read(&p->rx_bytes); } while (u64_stats_fetch_retry(&p->syncp_rx, start)); =20 do { start =3D u64_stats_fetch_begin(&p->syncp_tx); - txpackets =3D p->tx_packets; - txbytes =3D p->tx_bytes; + txpackets =3D u64_stats_read(&p->tx_packets); + txbytes =3D u64_stats_read(&p->tx_bytes); } while (u64_stats_fetch_retry(&p->syncp_tx, start)); =20 stats->rx_packets =3D rxpackets; --=20 2.51.0