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[146.241.59.53]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-43ab37403cfsm15578055e9.1.2025.02.25.05.04.41 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 25 Feb 2025 05:04:43 -0800 (PST) Message-ID: Date: Tue, 25 Feb 2025 14:04:40 +0100 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 v5 3/9] net: devmem: Implement TX path To: Mina Almasry , netdev@vger.kernel.org, linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org, virtualization@lists.linux.dev, kvm@vger.kernel.org, linux-kselftest@vger.kernel.org Cc: Donald Hunter , Jakub Kicinski , "David S. Miller" , Eric Dumazet , Simon Horman , Jonathan Corbet , Andrew Lunn , Jeroen de Borst , Harshitha Ramamurthy , Kuniyuki Iwashima , Willem de Bruijn , David Ahern , Neal Cardwell , Stefan Hajnoczi , Stefano Garzarella , "Michael S. Tsirkin" , Jason Wang , Xuan Zhuo , =?UTF-8?Q?Eugenio_P=C3=A9rez?= , Shuah Khan , sdf@fomichev.me, asml.silence@gmail.com, dw@davidwei.uk, Jamal Hadi Salim , Victor Nogueira , Pedro Tammela , Samiullah Khawaja , Kaiyuan Zhang References: <20250222191517.743530-1-almasrymina@google.com> <20250222191517.743530-4-almasrymina@google.com> Content-Language: en-US From: Paolo Abeni In-Reply-To: <20250222191517.743530-4-almasrymina@google.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit On 2/22/25 8:15 PM, Mina Almasry wrote: [...] > @@ -119,6 +122,13 @@ void net_devmem_unbind_dmabuf(struct net_devmem_dmabuf_binding *binding) > unsigned long xa_idx; > unsigned int rxq_idx; > > + xa_erase(&net_devmem_dmabuf_bindings, binding->id); > + > + /* Ensure no tx net_devmem_lookup_dmabuf() are in flight after the > + * erase. > + */ > + synchronize_net(); Is the above statement always true? can the dmabuf being stuck in some qdisc? or even some local socket due to redirect? > @@ -252,13 +261,23 @@ net_devmem_bind_dmabuf(struct net_device *dev, unsigned int dmabuf_fd, > * binding can be much more flexible than that. We may be able to > * allocate MTU sized chunks here. Leave that for future work... > */ > - binding->chunk_pool = > - gen_pool_create(PAGE_SHIFT, dev_to_node(&dev->dev)); > + binding->chunk_pool = gen_pool_create(PAGE_SHIFT, > + dev_to_node(&dev->dev)); > if (!binding->chunk_pool) { > err = -ENOMEM; > goto err_unmap; > } > > + if (direction == DMA_TO_DEVICE) { > + binding->tx_vec = kvmalloc_array(dmabuf->size / PAGE_SIZE, > + sizeof(struct net_iov *), > + GFP_KERNEL); > + if (!binding->tx_vec) { > + err = -ENOMEM; > + goto err_free_chunks; Possibly my comment on v3 has been lost: """ It looks like the later error paths (in the for_each_sgtable_dma_sg() loop) could happen even for 'direction == DMA_TO_DEVICE', so I guess an additional error label is needed to clean tx_vec on such paths. """ [...] > @@ -1071,6 +1072,16 @@ int tcp_sendmsg_locked(struct sock *sk, struct msghdr *msg, size_t size) > > flags = msg->msg_flags; > > + sockc = (struct sockcm_cookie){ .tsflags = READ_ONCE(sk->sk_tsflags), > + .dmabuf_id = 0 }; > + if (msg->msg_controllen) { > + err = sock_cmsg_send(sk, msg, &sockc); > + if (unlikely(err)) { > + err = -EINVAL; > + goto out_err; > + } > + } I'm unsure how much that would be a problem, but it looks like that unblocking sendmsg(MSG_FASTOPEN) with bad msg argument will start to fail on top of this patch, while they should be successful (EINPROGRESS) before. /P