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[80.230.48.7]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-48e6dafa6c2sm42673165e9.5.2026.05.09.15.44.51 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 09 May 2026 15:44:54 -0700 (PDT) Date: Sat, 9 May 2026 18:44:49 -0400 From: "Michael S. Tsirkin" To: Simon Schippers Cc: willemdebruijn.kernel@gmail.com, jasowang@redhat.com, andrew+netdev@lunn.ch, davem@davemloft.net, edumazet@google.com, kuba@kernel.org, pabeni@redhat.com, eperezma@redhat.com, leiyang@redhat.com, stephen@networkplumber.org, jon@nutanix.com, tim.gebauer@tu-dortmund.de, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, kvm@vger.kernel.org, virtualization@lists.linux.dev Subject: Re: [PATCH net-next v11 1/4] tun/tap: add ptr_ring consume helper with netdev queue wakeup Message-ID: <20260509183518-mutt-send-email-mst@kernel.org> References: <20260508151048.183125-1-simon.schippers@tu-dortmund.de> <20260508151048.183125-2-simon.schippers@tu-dortmund.de> Precedence: bulk X-Mailing-List: kvm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: On Sat, May 09, 2026 at 06:31:47PM +0200, Simon Schippers wrote: > On 5/8/26 17:10, Simon Schippers wrote: > > +static void tun_queue_purge(struct tun_struct *tun, struct tun_file *tfile) > > { > > void *ptr; > > > > - while ((ptr = ptr_ring_consume(&tfile->tx_ring)) != NULL) > > + while ((ptr = tun_ring_consume(tun, tfile)) != NULL) > > tun_ptr_free(ptr); > > > > skb_queue_purge(&tfile->sk.sk_write_queue); > > Sashiko is right once again. tun_ring_consume() in tun_queue_purge() > operates on a tfile that is being torn down. Its queue_index is no > longer valid. After the swap in __tun_detach(), it points to the > netdev subqueue of a different tfile. > --> We should not wake there. Does it not exactly point at ntfile which is what we want to wake? > I will swap tun_ring_consume() with ptr_ring_consume() again and > submit a v12 :) If so then maybe netif_tx_wake_queue(netdev_get_tx_queue(tun->dev, index)); -- MST