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Thu, 04 Jun 2026 01:19:20 -0700 (PDT) Received: from [192.168.88.32] ([212.105.155.59]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-4601f2dc577sm14133428f8f.3.2026.06.04.01.19.18 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 04 Jun 2026 01:19:19 -0700 (PDT) Message-ID: Date: Thu, 4 Jun 2026 10:19:18 +0200 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH net-next v6 2/5] veth: implement Byte Queue Limits (BQL) for latency reduction To: hawk@kernel.org, netdev@vger.kernel.org Cc: Andrew Lunn , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Alexei Starovoitov , Daniel Borkmann , John Fastabend , Stanislav Fomichev , linux-kernel@vger.kernel.org, bpf@vger.kernel.org References: <20260527135418.1166665-1-hawk@kernel.org> <20260527135418.1166665-3-hawk@kernel.org> From: Paolo Abeni Content-Language: en-US In-Reply-To: <20260527135418.1166665-3-hawk@kernel.org> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit On 5/27/26 3:54 PM, hawk@kernel.org wrote: > @@ -348,10 +381,11 @@ static netdev_tx_t veth_xmit(struct sk_buff *skb, struct net_device *dev) > { > struct veth_priv *rcv_priv, *priv = netdev_priv(dev); > struct veth_rq *rq = NULL; > - struct netdev_queue *txq; > + struct netdev_queue *txq = NULL; Minor nit: please fix the variables declaration order above. > @@ -1092,6 +1137,24 @@ static void veth_napi_del_range(struct net_device *dev, int start, int end) > ptr_ring_cleanup(&rq->xdp_ring, veth_ptr_free); > } > > + /* Reset BQL and wake stopped peer txqs. A concurrent veth_xmit() > + * may have set DRV_XOFF between rcu_assign_pointer(napi, NULL) and > + * synchronize_net(), and NAPI can no longer clear it. > + * Only wake when the device is still up. > + */ > + peer = rtnl_dereference(priv->peer); > + if (peer) { > + int peer_end = min_t(int, end, peer->real_num_tx_queues); Sashiko noted you may need to additionally complete/reset the tx queue in the .. range, and I think it's right. /P