From nobody Sun Mar 22 09:49:26 2026 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 394C7336881 for ; Thu, 5 Mar 2026 04:05:58 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1772683559; cv=none; b=W66wLg0U/5GpIppd8k1BECs0Lwsh9O3MRnFsJrdv0JdEM/7FHx4Hj1JX2wgl3iBIcudnwECaicR9zfpjx9pjOUP4C4GCeTQqddmW8XW/jWuUnXNJhX5tZp9d43VNNmIoYl1o4iJlrPjtK+Ez8l0jyExo0IE/8/Syx+y/uZAgV/s= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1772683559; c=relaxed/simple; bh=+GVZwWw13FtMFjCyXVQu3iPZbPcUzwlM1qsKP0XU/Yg=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=CXqQj6Pv9Tc/qMxaqd6UOeexai8kMJVpkp6j7tPfe+4RZUiAu0dN4SAttlV662I7R/3YXcm+A6LJ57+tWIusDLsp1qCp5/XXDBoK3s9uZ0+rMsDRl29ryAN69qwWrn/+hkKpUGT4+QPCht2F0xQPz9AfNtC7rPpWUybC+LwVWpA= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=TcTgqWym; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="TcTgqWym" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 5649CC116C6; Thu, 5 Mar 2026 04:05:56 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1772683558; bh=+GVZwWw13FtMFjCyXVQu3iPZbPcUzwlM1qsKP0XU/Yg=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=TcTgqWymXSZtqozEMSvk5hmp3Pc6nhUwzsanRB+HYaSA1KQ3aKCxaZQP+1O1Ar6UZ ILzuLyXh7HekBgxhcKq+ss88q2ZGcKzpoZj65zjfDFYLtJPiB5jahdmL/hmH+gvOBH DLrbF2+IlOsHQuUQzmFchpkHGlbvlcl+Ud96W7wX2mtnTEMUL5zDSnsRSJ5auwhMMZ S7B4lsTVRvIwM8Wwd6kHLbNh4GNXpJJzwhTYM4Mi+XNg3k849d0U5SCVg6iE4p/vLR Zq7UQVRXkZFi0KwX4rvz0w184OFATKATpuoMwHVYJnIKw093xmos74OejdO0R1Ngvg ZMeUxakKlmWrw== From: Geliang Tang To: mptcp@lists.linux.dev, nilay@linux.ibm.com, ming.lei@redhat.com, hare@suse.de Cc: Geliang Tang , zhenwei pi , Hui Zhu , Gang Yan Subject: [RFC mptcp-next v4 5/8] mptcp: add sock_set_reuseaddr Date: Thu, 5 Mar 2026 12:05:23 +0800 Message-ID: <8dca88dcac861ed704dd4dba9528bc7f9b6b4892.1772683110.git.tanggeliang@kylinos.cn> X-Mailer: git-send-email 2.53.0 In-Reply-To: References: Precedence: bulk X-Mailing-List: mptcp@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" From: Geliang Tang This patch introduces a dedicated MPTCP helper, sock_set_reuseaddr, which sets the address reuse flag on the first subflow socket of an MPTCP connection, and applies it to the target side in the 'NVMe over MPTCP' implementation. Co-developed-by: zhenwei pi Signed-off-by: zhenwei pi Co-developed-by: Hui Zhu Signed-off-by: Hui Zhu Co-developed-by: Gang Yan Signed-off-by: Gang Yan Signed-off-by: Geliang Tang --- drivers/nvme/target/tcp.c | 2 ++ include/net/mptcp.h | 4 ++++ net/mptcp/protocol.c | 15 +++++++++++++++ 3 files changed, 21 insertions(+) diff --git a/drivers/nvme/target/tcp.c b/drivers/nvme/target/tcp.c index 8452d38614a6..5111c0e690ee 100644 --- a/drivers/nvme/target/tcp.c +++ b/drivers/nvme/target/tcp.c @@ -2086,6 +2086,8 @@ static int nvmet_tcp_add_port(struct nvmet_port *npor= t) port->sock->sk->sk_user_data =3D port; port->data_ready =3D port->sock->sk->sk_data_ready; port->sock->sk->sk_data_ready =3D nvmet_tcp_listen_data_ready; + sk_is_msk(port->sock->sk) ? + mptcp_sock_set_reuseaddr(port->sock->sk) : sock_set_reuseaddr(port->sock->sk); sk_is_msk(port->sock->sk) ? mptcp_sock_set_nodelay(port->sock->sk) : diff --git a/include/net/mptcp.h b/include/net/mptcp.h index 60cbf29448b0..63b64b7699e3 100644 --- a/include/net/mptcp.h +++ b/include/net/mptcp.h @@ -246,6 +246,8 @@ static inline __be32 mptcp_reset_option(const struct sk= _buff *skb) void mptcp_active_detect_blackhole(struct sock *sk, bool expired); =20 void mptcp_sock_set_nodelay(struct sock *sk); + +void mptcp_sock_set_reuseaddr(struct sock *sk); #else =20 static inline void mptcp_init(void) @@ -339,6 +341,8 @@ static inline __be32 mptcp_reset_option(const struct sk= _buff *skb) { return hto static inline void mptcp_active_detect_blackhole(struct sock *sk, bool exp= ired) { } =20 static inline void mptcp_sock_set_nodelay(struct sock *sk) { } + +static inline void mptcp_sock_set_reuseaddr(struct sock *sk) { } #endif /* CONFIG_MPTCP */ =20 #if IS_ENABLED(CONFIG_MPTCP_IPV6) diff --git a/net/mptcp/protocol.c b/net/mptcp/protocol.c index 451bc4df4fa4..61f4eba02b37 100644 --- a/net/mptcp/protocol.c +++ b/net/mptcp/protocol.c @@ -3823,6 +3823,21 @@ void mptcp_sock_set_nodelay(struct sock *sk) } EXPORT_SYMBOL(mptcp_sock_set_nodelay); =20 +void mptcp_sock_set_reuseaddr(struct sock *sk) +{ + struct mptcp_sock *msk =3D mptcp_sk(sk); + struct sock *ssk; + + lock_sock(sk); + ssk =3D __mptcp_nmpc_sk(msk); + if (IS_ERR(ssk)) + goto unlock; + ssk->sk_reuse =3D SK_CAN_REUSE; +unlock: + release_sock(sk); +} +EXPORT_SYMBOL(mptcp_sock_set_reuseaddr); + bool mptcp_finish_join(struct sock *ssk) { struct mptcp_subflow_context *subflow =3D mptcp_subflow_ctx(ssk); --=20 2.53.0