From patchwork Mon Aug 19 19:45:25 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Matthieu Baerts (NGI0)" X-Patchwork-Id: 13768934 X-Patchwork-Delegate: kuba@kernel.org 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 100F51E4EF4; Mon, 19 Aug 2024 19:45:48 +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=1724096748; cv=none; b=Z53xjJjvpCWVL37sW0IXX9bRSasfPKqvYZbjdvLES+eNa70Kk5tgfJnRDzq4tupbukPcgwa0ASN1x3SxjNtFw9pc4BbGs/QLySFqqZs4mne64fLb+FCco5tLT0sZTXwsLxmOw9wpM8mwTbeZzcNpQe9bZzOfPzAqXpqStTXaAcQ= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1724096748; c=relaxed/simple; bh=BTC1VqrgypC0zR0a/DPftpsfqKtSqKmahpvHDAKQMXg=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=KyQ9zV7KCIqWxTPRqPF5GI6nEmQQnrGF3n785ClXHpMW2vXi8fFyCC317V/1yymvEAsYNW0f2702Lb0bvIwcpHdh+FdDG6fmYtg0lAQvZf70pyBUeJ5xEwUSUmZg4jwKj57JkNt/kHDOKNhtiBX6iXSzeOWGrO5EOA80e4RgkfY= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=ka5ojFE4; 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="ka5ojFE4" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 4FCBCC4AF0E; Mon, 19 Aug 2024 19:45:45 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1724096747; bh=BTC1VqrgypC0zR0a/DPftpsfqKtSqKmahpvHDAKQMXg=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=ka5ojFE474ErJ8kwIBbixpX8geY+tOEnYTHKQpE5vtuzWpabbs07VH98SJkLD1zcM +3Y2GHAmx1tTPJWH3F2jVN5gDwsr93S1Ph5ClEUrpBcQr04365hvXB8APyiDw5hcz1 QvRnINMeBaTNq17/nRBhbNCx3s/7OGnaOeSu98MjLthNSv8doRXJwySx8OXLVOk/7E p1f84gOd3sT5eJo7fw4RpV+7ZOd+3a0IuS5ZYJcXO9Gj2OgOgq8t1E5VnI8bgan8Ln pJo40xQ0mRq+4AkLaq53mHrfFDlXUiUQhuMjffYP8KoksgtaCoqOW3XFpLt3lpxosX 4876k1lwPhJ8Q== From: "Matthieu Baerts (NGI0)" Date: Mon, 19 Aug 2024 21:45:25 +0200 Subject: [PATCH net 07/14] mptcp: pm: remove mptcp_pm_remove_subflow() Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-Id: <20240819-net-mptcp-pm-reusing-id-v1-7-38035d40de5b@kernel.org> References: <20240819-net-mptcp-pm-reusing-id-v1-0-38035d40de5b@kernel.org> In-Reply-To: <20240819-net-mptcp-pm-reusing-id-v1-0-38035d40de5b@kernel.org> To: mptcp@lists.linux.dev, Mat Martineau , Geliang Tang , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Shuah Khan Cc: netdev@vger.kernel.org, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, "Matthieu Baerts (NGI0)" , stable@vger.kernel.org X-Mailer: b4 0.14.1 X-Developer-Signature: v=1; a=openpgp-sha256; l=4749; i=matttbe@kernel.org; h=from:subject:message-id; bh=BTC1VqrgypC0zR0a/DPftpsfqKtSqKmahpvHDAKQMXg=; b=owEBbQKS/ZANAwAIAfa3gk9CaaBzAcsmYgBmw6DTcaXMICC6/6mJo75ZmAFgQEYtPhgQL8oxd sRt5BZq67OJAjMEAAEIAB0WIQToy4X3aHcFem4n93r2t4JPQmmgcwUCZsOg0wAKCRD2t4JPQmmg c8OhD/wNmNTAqUfXbPxULsX9+aAdPC7QnqNsXRZBZc0mzpww/ik5tRr1fKvRJ/FD2iNeN81kRbA GCYleKQcNjv9faivL9gnJtMdRRSlSc15I7wiapBakzUXwrgoNHi+G3ecBSyH13on0/CznrMJ2fl Zgn45vY274IH5948XPxQ8pPrRXbYUgMkvpPivh9Mi161I17djdD64tagedzyDhMeDra3HLj+hfG SHYsvfliMI3x6Ah2nsmPRSZ2gGHYoruWDSTlmVuj8erMFfQJXbRA4BjugZYz4KUS5l+nf7rGH8W oYGlANkAOkIr8HOFkmUkJYW+wRrzQQ8n7wR0TDxhQO0zf8ri+s7OzFxddU4K2otgH53Fut3Rgx0 8v3nl2TWo2mMUEhjmkMCvWpE+BJd5ftuqs1/GxNKdBYCnTnNnIx5DdP6ohAG+eubtcpX/qVKdI0 9WRC8oIZFQUxSh3qHqVLS9+tC6KUQrm8AQ7KqHomq2Fb3U1nqWztIyY590fq5dBXkYkQDlGaz+V q5TdNvFvX3+XfBAE426KIcehpoHh7JRJBA12nN7Ywf8Sewcay+KWYWVL2j3SMrA+xpoTZ4xeic8 G9eb0XKGvHai9+jVvvB762hB+yt/buUt97kSouHPlauWY8XepuemWSwNQ5dp6/UCajP3mQGouHk /I6tw8UD64R4DXw== X-Developer-Key: i=matttbe@kernel.org; a=openpgp; fpr=E8CB85F76877057A6E27F77AF6B7824F4269A073 X-Patchwork-Delegate: kuba@kernel.org This helper is confusing. It is in pm.c, but it is specific to the in-kernel PM and it cannot be used by the userspace one. Also, it simply calls one in-kernel specific function with the PM lock, while the similar mptcp_pm_remove_addr() helper requires the PM lock. What's left is the pr_debug(), which is not that useful, because a similar one is present in the only function called by this helper: mptcp_pm_nl_rm_subflow_received() After these modifications, this helper can be marked as 'static', and the lock can be taken only once in mptcp_pm_flush_addrs_and_subflows(). Note that it is not a bug fix, but it will help backporting the following commits. Fixes: 0ee4261a3681 ("mptcp: implement mptcp_pm_remove_subflow") Cc: stable@vger.kernel.org Reviewed-by: Mat Martineau Signed-off-by: Matthieu Baerts (NGI0) --- net/mptcp/pm.c | 10 ---------- net/mptcp/pm_netlink.c | 16 +++++++--------- net/mptcp/protocol.h | 3 --- 3 files changed, 7 insertions(+), 22 deletions(-) diff --git a/net/mptcp/pm.c b/net/mptcp/pm.c index 23bb89c94e90..925123e99889 100644 --- a/net/mptcp/pm.c +++ b/net/mptcp/pm.c @@ -60,16 +60,6 @@ int mptcp_pm_remove_addr(struct mptcp_sock *msk, const struct mptcp_rm_list *rm_ return 0; } -int mptcp_pm_remove_subflow(struct mptcp_sock *msk, const struct mptcp_rm_list *rm_list) -{ - pr_debug("msk=%p, rm_list_nr=%d", msk, rm_list->nr); - - spin_lock_bh(&msk->pm.lock); - mptcp_pm_nl_rm_subflow_received(msk, rm_list); - spin_unlock_bh(&msk->pm.lock); - return 0; -} - /* path manager event handlers */ void mptcp_pm_new_connection(struct mptcp_sock *msk, const struct sock *ssk, int server_side) diff --git a/net/mptcp/pm_netlink.c b/net/mptcp/pm_netlink.c index 2c26696b820e..44fc1c5959ac 100644 --- a/net/mptcp/pm_netlink.c +++ b/net/mptcp/pm_netlink.c @@ -857,8 +857,8 @@ static void mptcp_pm_nl_rm_addr_received(struct mptcp_sock *msk) mptcp_pm_nl_rm_addr_or_subflow(msk, &msk->pm.rm_list_rx, MPTCP_MIB_RMADDR); } -void mptcp_pm_nl_rm_subflow_received(struct mptcp_sock *msk, - const struct mptcp_rm_list *rm_list) +static void mptcp_pm_nl_rm_subflow_received(struct mptcp_sock *msk, + const struct mptcp_rm_list *rm_list) { mptcp_pm_nl_rm_addr_or_subflow(msk, rm_list, MPTCP_MIB_RMSUBFLOW); } @@ -1471,7 +1471,9 @@ static int mptcp_nl_remove_subflow_and_signal_addr(struct net *net, !(entry->flags & MPTCP_PM_ADDR_FLAG_IMPLICIT)); if (remove_subflow) { - mptcp_pm_remove_subflow(msk, &list); + spin_lock_bh(&msk->pm.lock); + mptcp_pm_nl_rm_subflow_received(msk, &list); + spin_unlock_bh(&msk->pm.lock); } else if (entry->flags & MPTCP_PM_ADDR_FLAG_SUBFLOW) { /* If the subflow has been used, but now closed */ spin_lock_bh(&msk->pm.lock); @@ -1617,18 +1619,14 @@ static void mptcp_pm_remove_addrs_and_subflows(struct mptcp_sock *msk, alist.ids[alist.nr++] = entry->addr.id; } + spin_lock_bh(&msk->pm.lock); if (alist.nr) { - spin_lock_bh(&msk->pm.lock); msk->pm.add_addr_signaled -= alist.nr; mptcp_pm_remove_addr(msk, &alist); - spin_unlock_bh(&msk->pm.lock); } - if (slist.nr) - mptcp_pm_remove_subflow(msk, &slist); - + mptcp_pm_nl_rm_subflow_received(msk, &slist); /* Reset counters: maybe some subflows have been removed before */ - spin_lock_bh(&msk->pm.lock); bitmap_fill(msk->pm.id_avail_bitmap, MPTCP_PM_MAX_ADDR_ID + 1); msk->pm.local_addr_used = 0; spin_unlock_bh(&msk->pm.lock); diff --git a/net/mptcp/protocol.h b/net/mptcp/protocol.h index 60c6b073d65f..a1c1b0ff1ce1 100644 --- a/net/mptcp/protocol.h +++ b/net/mptcp/protocol.h @@ -1026,7 +1026,6 @@ int mptcp_pm_announce_addr(struct mptcp_sock *msk, const struct mptcp_addr_info *addr, bool echo); int mptcp_pm_remove_addr(struct mptcp_sock *msk, const struct mptcp_rm_list *rm_list); -int mptcp_pm_remove_subflow(struct mptcp_sock *msk, const struct mptcp_rm_list *rm_list); void mptcp_pm_remove_addrs(struct mptcp_sock *msk, struct list_head *rm_list); void mptcp_free_local_addr_list(struct mptcp_sock *msk); @@ -1133,8 +1132,6 @@ static inline u8 subflow_get_local_id(const struct mptcp_subflow_context *subflo void __init mptcp_pm_nl_init(void); void mptcp_pm_nl_work(struct mptcp_sock *msk); -void mptcp_pm_nl_rm_subflow_received(struct mptcp_sock *msk, - const struct mptcp_rm_list *rm_list); unsigned int mptcp_pm_get_add_addr_signal_max(const struct mptcp_sock *msk); unsigned int mptcp_pm_get_add_addr_accept_max(const struct mptcp_sock *msk); unsigned int mptcp_pm_get_subflows_max(const struct mptcp_sock *msk);