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Wed, 21 Oct 2026 02:43:03 -0700 (PDT) X-Received: by 2002:a05:600d:864d:10b0:49f:e941:d6e with SMTP id 5b1f17b1804b1-4a1fdd399dbmr19402975e9.21.1792575782925; Wed, 21 Oct 2026 02:43:02 -0700 (PDT) Received: from sgarzare-redhat ([193.207.178.135]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-48e258427cesm4305321f8f.52.2026.10.21.02.43.01 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 21 Oct 2026 02:43:01 -0700 (PDT) Date: Wed, 21 Oct 2026 11:42:59 +0200 From: Stefano Garzarella To: David Carlier Cc: netdev@vger.kernel.org, bobbyeshleman@gmail.com, davem@davemloft.net, edumazet@kernel.org, kuba@kernel.org, pabeni@redhat.com, horms@kernel.org, virtualization@lists.linux.dev, linux-kernel@vger.kernel.org Subject: Re: [PATCH net-next v3 2/3] vsock: support SO_INQ on stream sockets Message-ID: References: <20261016132716.272018-1-devnexen@gmail.com> <20261016132716.272018-3-devnexen@gmail.com> X-Mailing-List: virtualization@lists.linux.dev List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 In-Reply-To: <20261016132716.272018-3-devnexen@gmail.com> X-Mimecast-Spam-Score: 0 X-Mimecast-MFC-PROC-ID: LOgxdGaU7tEFXxrDv2ZYP2argagZkAcieJxdKrfmrD0_1792575784 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=us-ascii; format=flowed Content-Disposition: inline On Fri, Oct 16, 2026 at 02:27:15PM +0100, David Carlier wrote: >SO_INQ makes recvmsg() return the bytes left in the receive queue in an >SCM_INQ cmsg, saving a SIOCINQ call per receive. AF_UNIX stream sockets >support it, AF_VSOCK fails with ENOPROTOOPT. > >Add it for SOCK_STREAM, reusing the hint already computed for io_uring. >As with TCP_INQ, 1 is reported once the stream is finished so the caller >reads again and sees EOF, and accepted sockets inherit the setting from >the listener. No cmsg is sent when the transport cannot report the queue >length. > >SOCK_SEQPACKET is refused, as on AF_UNIX: its transport callback counts >messages, not bytes. > >Signed-off-by: David Carlier >--- > include/net/af_vsock.h | 1 + > net/vmw_vsock/af_vsock.c | 35 ++++++++++++++++++++++++++++++++--- > 2 files changed, 33 insertions(+), 3 deletions(-) Reviewed-by: Stefano Garzarella