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Thu, 20 Nov 2025 04:19:56 -0800 (PST) Received: from [192.168.88.32] ([212.105.155.41]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-42cb7fba201sm5107021f8f.32.2025.11.20.04.19.55 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 20 Nov 2025 04:19:56 -0800 (PST) Message-ID: Date: Thu, 20 Nov 2025 13:19:54 +0100 Precedence: bulk X-Mailing-List: linux-doc@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH net-next v7 3/5] net: devmem: implement autorelease token management To: Bobby Eshleman , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Simon Horman , Kuniyuki Iwashima , Willem de Bruijn , Neal Cardwell , David Ahern , Arnd Bergmann , Jonathan Corbet , Andrew Lunn , Shuah Khan , Donald Hunter , Mina Almasry Cc: netdev@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arch@vger.kernel.org, linux-doc@vger.kernel.org, linux-kselftest@vger.kernel.org, Stanislav Fomichev , Bobby Eshleman References: <20251119-scratch-bobbyeshleman-devmem-tcp-token-upstream-v7-0-1abc8467354c@meta.com> <20251119-scratch-bobbyeshleman-devmem-tcp-token-upstream-v7-3-1abc8467354c@meta.com> Content-Language: en-US From: Paolo Abeni In-Reply-To: <20251119-scratch-bobbyeshleman-devmem-tcp-token-upstream-v7-3-1abc8467354c@meta.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit On 11/20/25 4:37 AM, Bobby Eshleman wrote: > @@ -2479,10 +2504,12 @@ static int tcp_recvmsg_dmabuf(struct sock *sk, const struct sk_buff *skb, > unsigned int offset, struct msghdr *msg, > int remaining_len) > { > + struct net_devmem_dmabuf_binding *binding = NULL; > struct dmabuf_cmsg dmabuf_cmsg = { 0 }; > struct tcp_xa_pool tcp_xa_pool; > unsigned int start; > int i, copy, n; > + int refs = 0; > int sent = 0; > int err = 0; > > @@ -2536,6 +2563,7 @@ static int tcp_recvmsg_dmabuf(struct sock *sk, const struct sk_buff *skb, > skb_frag_t *frag = &skb_shinfo(skb)->frags[i]; > struct net_iov *niov; > u64 frag_offset; > + u32 token; > int end; > > /* !skb_frags_readable() should indicate that ALL the > @@ -2568,13 +2596,32 @@ static int tcp_recvmsg_dmabuf(struct sock *sk, const struct sk_buff *skb, > start; > dmabuf_cmsg.frag_offset = frag_offset; > dmabuf_cmsg.frag_size = copy; > - err = tcp_xa_pool_refill(sk, &tcp_xa_pool, > - skb_shinfo(skb)->nr_frags - i); > - if (err) > + > + binding = net_devmem_iov_binding(niov); > + > + if (!sk->sk_devmem_info.binding) > + sk->sk_devmem_info.binding = binding; > + > + if (sk->sk_devmem_info.binding != binding) { > + err = -EFAULT; > goto out; > + } > + > + if (static_branch_unlikely(&tcp_devmem_ar_key)) { Not a real/full review but the above is apparently causing kunit build failures: ERROR:root:ld: vmlinux.o: in function `tcp_recvmsg_dmabuf': tcp.c:(.text+0x669b21): undefined reference to `tcp_devmem_ar_key' ld: tcp.c:(.text+0x669b68): undefined reference to `tcp_devmem_ar_key' ld: tcp.c:(.text+0x669c54): undefined reference to `tcp_devmem_ar_key' make[3]: *** [../scripts/Makefile.vmlinux:72: vmlinux.unstripped] Error 1 make[2]: *** [/home/kunit/testing/Makefile:1242: vmlinux] Error 2 make[1]: *** [/home/kunit/testing/Makefile:248: __sub-make] Error 2 make: *** [Makefile:248: __sub-make] Error 2 see: https://netdev-3.bots.linux.dev/kunit/results/393664/ > @@ -2617,6 +2664,7 @@ static int tcp_recvmsg_dmabuf(struct sock *sk, const struct sk_buff *skb, > > out: > tcp_xa_pool_commit(sk, &tcp_xa_pool); > + [just because I stumbled upon the above while looking for the build issue]: please do not mix unrelated whitespace-change only with functional change. /P