From nobody Thu Nov 27 14:02:36 2025 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 B84C6315D32 for ; Wed, 26 Nov 2025 10:40:37 +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=1764153637; cv=none; b=DuXoIbWL3gb7M9mRAJDtlEhM8wM4qzqD3/z2mnkUIVcD+ZIeuzp8uHirkaL+7O5EAqOXsqMMTwAvx8NQnxeaYu+YkEYG+bbMinJlKqE6FeY/aSQKpFJPBTC3s3AWR7bw0d4zGOiLHu8fH5d91HGh/zM8Euw/Ow6HIvBZjrfs0Tw= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1764153637; c=relaxed/simple; bh=tKUDZjqve9JfGFOd55dQPXbJ6nfcGhBqJr3QWgLPxb8=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=jgT6wmXVKwi2HRoc/5cx81nP7A/Lv5fFLpFpg0se20v0QhqbnLN177WmraL4ntMMQ8mNPiqUTIiRwqimUmq5chBh5UfeAQf0Bs7srXQhtj6Hufw4mTkLRGJGRUdtoQoOpaO7ZjeLyRPxCjASZN49dFGYf/aLqQkPT34ljdLtnp0= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=PSvTT3dQ; 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="PSvTT3dQ" Received: by smtp.kernel.org (Postfix) with ESMTPSA id F208EC116D0; Wed, 26 Nov 2025 10:40:34 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1764153637; bh=tKUDZjqve9JfGFOd55dQPXbJ6nfcGhBqJr3QWgLPxb8=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=PSvTT3dQgFBjohjqy6kRoXhcMPy38zoOexdA1ymCTJ8V25tdXTjTnudjqtx6CfSGM LRCYIJ3wihmBLU32YSTEjzLISgxkBRIQyBBE5czTmgLQ4kWryZcS2KoOsdARvcF0XP zVM94uVLCTz6r99WazepanxO79F6AlXcF/4XqoI5qE4smg2kt/k/S3uGRYgI5CBORx sblFXeAcURbswC7qHwrTGOib/aZSqawLk08ruw2yGHQ4cAE8HnwaJ886Kps1sytImv sBcBErudDj2WPIgIuHlY9a5Uv1UwMW8b2wuxc2y3RGiNg9eD2oJHaNPXJFVGYbWUWp u8ZnliN11Vf1w== From: Geliang Tang To: mptcp@lists.linux.dev, hare@suse.de, hare@kernel.org Cc: Geliang Tang , Hui Zhu , Gang Yan , zhenwei pi Subject: [RFC mptcp-next v2 5/7] mptcp: add sock_set_syncnt Date: Wed, 26 Nov 2025 18:40:02 +0800 Message-ID: <6f8fd94cf8d2b77e9c258f73c708e139e5e279b4.1764152990.git.tanggeliang@kylinos.cn> X-Mailer: git-send-email 2.51.0 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 Implement an MPTCP-specific sock_set_syncnt helper, which will be used for NVMe over MPTCP. Co-developed-by: Hui Zhu Signed-off-by: Hui Zhu Co-developed-by: Gang Yan Signed-off-by: Gang Yan Co-developed-by: zhenwei pi Signed-off-by: zhenwei pi Signed-off-by: Geliang Tang --- include/net/mptcp.h | 7 +++++++ net/mptcp/protocol.c | 19 +++++++++++++++++++ 2 files changed, 26 insertions(+) diff --git a/include/net/mptcp.h b/include/net/mptcp.h index 4fc8f08c6588..7d981973df48 100644 --- a/include/net/mptcp.h +++ b/include/net/mptcp.h @@ -241,6 +241,8 @@ void mptcp_active_detect_blackhole(struct sock *sk, boo= l expired); void mptcp_sock_set_reuseaddr(struct sock *sk); =20 void mptcp_sock_set_nodelay(struct sock *sk); + +int mptcp_sock_set_syncnt(struct sock *sk, int val); #else =20 static inline void mptcp_init(void) @@ -331,6 +333,11 @@ static inline void mptcp_active_detect_blackhole(struc= t sock *sk, bool expired) static inline void mptcp_sock_set_reuseaddr(struct sock *sk) { } =20 static inline void mptcp_sock_set_nodelay(struct sock *sk) { } + +static inline int mptcp_sock_set_syncnt(struct sock *sk, int val) +{ + return 0; +} #endif /* CONFIG_MPTCP */ =20 #if IS_ENABLED(CONFIG_MPTCP_IPV6) diff --git a/net/mptcp/protocol.c b/net/mptcp/protocol.c index 9790bc74a0b7..543fa3131af7 100644 --- a/net/mptcp/protocol.c +++ b/net/mptcp/protocol.c @@ -3797,6 +3797,25 @@ void mptcp_sock_set_nodelay(struct sock *sk) } EXPORT_SYMBOL(mptcp_sock_set_nodelay); =20 +int mptcp_sock_set_syncnt(struct sock *sk, int val) +{ + struct mptcp_sock *msk =3D mptcp_sk(sk); + struct sock *ssk; + + if (val < 1 || val > MAX_TCP_SYNCNT) + return -EINVAL; + + lock_sock(sk); + ssk =3D __mptcp_nmpc_sk(msk); + if (IS_ERR(ssk)) + goto unlock; + WRITE_ONCE(inet_csk(ssk)->icsk_syn_retries, val); +unlock: + release_sock(sk); + return 0; +} +EXPORT_SYMBOL(mptcp_sock_set_syncnt); + bool mptcp_finish_join(struct sock *ssk) { struct mptcp_subflow_context *subflow =3D mptcp_subflow_ctx(ssk); --=20 2.51.0