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Fri, 01 Aug 2025 19:46:47 -0700 (PDT) From: Mohsin Bashir To: netdev@vger.kernel.org Cc: alexanderduyck@fb.com, andrew+netdev@lunn.ch, davem@davemloft.net, edumazet@google.com, horms@kernel.org, kernel-team@meta.com, kuba@kernel.org, linux-kernel@vger.kernel.org, mohsin.bashr@gmail.com, pabeni@redhat.com, sdf@fomichev.me, vadim.fedorenko@linux.dev Subject: [PATCH net 2/2] eth: fbnic: Lock the tx_dropped update Date: Fri, 1 Aug 2025 19:46:36 -0700 Message-ID: <20250802024636.679317-3-mohsin.bashr@gmail.com> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20250802024636.679317-1-mohsin.bashr@gmail.com> References: <20250802024636.679317-1-mohsin.bashr@gmail.com> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Wrap copying of drop stats on TX path from fbd->hw_stats by the hw_stats_lock. Currently, it is being performed outside the lock and another thread accessing fbd->hw_stats can lead to inconsistencies. Fixes: 5f8bd2ce8269 ("eth: fbnic: add support for TMI stats") Signed-off-by: Jakub Kicinski Signed-off-by: Mohsin Bashir --- drivers/net/ethernet/meta/fbnic/fbnic_netdev.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/net/ethernet/meta/fbnic/fbnic_netdev.c b/drivers/net/ethernet/meta/fbnic/fbnic_netdev.c index dc295e1b8516..d0e381ad7bee 100644 --- a/drivers/net/ethernet/meta/fbnic/fbnic_netdev.c +++ b/drivers/net/ethernet/meta/fbnic/fbnic_netdev.c @@ -421,10 +421,12 @@ static void fbnic_get_stats64(struct net_device *dev, tx_dropped = stats->dropped; /* Record drops from Tx HW Datapath */ + spin_lock(&fbd->hw_stats_lock); tx_dropped += fbd->hw_stats.tmi.drop.frames.value + fbd->hw_stats.tti.cm_drop.frames.value + fbd->hw_stats.tti.frame_drop.frames.value + fbd->hw_stats.tti.tbi_drop.frames.value; + spin_unlock(&fbd->hw_stats_lock); stats64->tx_bytes = tx_bytes; stats64->tx_packets = tx_packets; -- 2.47.3