From patchwork Wed Nov 13 18:46:44 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Dmitry Safonov via B4 Relay X-Patchwork-Id: 13874165 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 497DE206047; Wed, 13 Nov 2024 18:47:08 +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=1731523628; cv=none; b=s333uKLa+8uTP6YlTKKXM7ggkQcaMiWkIg9yIEzsMo+cksMJFEJVM8Qg76JSrVSi2ya0bpXKAmVgp1FwQAwHYiW0z0joWBIuwhhvzVAqrZHodlhxJAmbCgQAxjQhn6NW9GfPCvaw5yiBYZoPQLf2U1IKqSNEph2m/4hn9kDKSp0= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1731523628; c=relaxed/simple; bh=hUXnHZwdxyXGHKs/xhNvNy/CJiyEexLZlYu0RRseBcs=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=EpSN1iouxtyg7XQ0tLDoUWk0R1wzgO6TeKB8PaqcgNbI3pVBYute8MilLocN/41swRxwnYVl2LM3RoBdffyicSf5QXIzlDl5YDN9LzvGcF7tXxmU7t+Ug9UpBEkWM7ygqN5HlXFZsEtlPSj8bkHWUdPjnoKCyaOhmuEV2wCqrOM= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=RhH3KB4Y; 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="RhH3KB4Y" Received: by smtp.kernel.org (Postfix) with ESMTPS id DB11DC4AF14; Wed, 13 Nov 2024 18:47:07 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1731523627; bh=hUXnHZwdxyXGHKs/xhNvNy/CJiyEexLZlYu0RRseBcs=; h=From:Date:Subject:References:In-Reply-To:To:Cc:Reply-To:From; b=RhH3KB4YlqYuUEsbYmOXihEuV9SB9syrhTOud0q86nvJwKwAUT9KESvyNa+v7HdlT sb8bILLP7iND7/y+QQsGgYF7RykfspyrzEYgR/y15y9g9ny4yiLnT5C/ttoIa4Sa5a 3G8X1OnbpCMs0V0I+z17+UPqOSesDmw94cOkI0st4GKwXdpYuU0TmbmV87mBf5fvgy RGrx6TVUGZdewrf7/QnIwSXAfwIXNknIodQlJRXWpNUd6JvE+OLP6pboSb0FK9mSXx OAP2Qjcho96iARpDyTxI6/khmehi7zUZtmy2+8CXkcbSgg+pAqrGwZMoBlHvpyjf5U 1So3eRVEyIkfA== Received: from aws-us-west-2-korg-lkml-1.web.codeaurora.org (localhost.localdomain [127.0.0.1]) by smtp.lore.kernel.org (Postfix) with ESMTP id CFC09D637A8; Wed, 13 Nov 2024 18:47:07 +0000 (UTC) From: Dmitry Safonov via B4 Relay Date: Wed, 13 Nov 2024 18:46:44 +0000 Subject: [PATCH net v2 5/5] net/netlink: Correct the comment on netlink message max cap Precedence: bulk X-Mailing-List: mptcp@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-Id: <20241113-tcp-md5-diag-prep-v2-5-00a2a7feb1fa@gmail.com> References: <20241113-tcp-md5-diag-prep-v2-0-00a2a7feb1fa@gmail.com> In-Reply-To: <20241113-tcp-md5-diag-prep-v2-0-00a2a7feb1fa@gmail.com> To: "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Simon Horman , David Ahern , Ivan Delalande , Matthieu Baerts , Mat Martineau , Geliang Tang , Boris Pismenny , John Fastabend , Davide Caratti , Kuniyuki Iwashima Cc: netdev@vger.kernel.org, linux-kernel@vger.kernel.org, mptcp@lists.linux.dev, Dmitry Safonov <0x7f454c46@gmail.com> X-Mailer: b4 0.14.2 X-Developer-Signature: v=1; a=ed25519-sha256; t=1731523626; l=1447; i=0x7f454c46@gmail.com; s=20240410; h=from:subject:message-id; bh=Kmj21DwNJNOs65kiQumd7s7cSWkgFWMCJrFg+lJ9ggE=; b=qNnWzbuC5xOp5vDnjdmcYD7+PMI4g7cI0hr6QqKcmXoyiNDod483tlWaRYVCE3U4sTJ+LGrBu jKpN8Mpm5yjDybByujZIIDiDPIRZV0V/hk8F1EkCqsEdnDLLhTY120p X-Developer-Key: i=0x7f454c46@gmail.com; a=ed25519; pk=cFSWovqtkx0HrT5O9jFCEC/Cef4DY8a2FPeqP4THeZQ= X-Endpoint-Received: by B4 Relay for 0x7f454c46@gmail.com/20240410 with auth_id=152 X-Original-From: Dmitry Safonov <0x7f454c46@gmail.com> Reply-To: 0x7f454c46@gmail.com From: Dmitry Safonov <0x7f454c46@gmail.com> Since commit d35c99ff77ec ("netlink: do not enter direct reclaim from netlink_dump()") the cap is 32KiB. Signed-off-by: Dmitry Safonov <0x7f454c46@gmail.com> --- net/netlink/af_netlink.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/net/netlink/af_netlink.c b/net/netlink/af_netlink.c index 0a9287fadb47a2afaf0babe675738bc43051c5a7..27979cefc06256bde052898d193ed99f710c2087 100644 --- a/net/netlink/af_netlink.c +++ b/net/netlink/af_netlink.c @@ -2279,7 +2279,7 @@ static int netlink_dump(struct sock *sk, bool lock_taken) goto errout_skb; /* NLMSG_GOODSIZE is small to avoid high order allocations being - * required, but it makes sense to _attempt_ a 16K bytes allocation + * required, but it makes sense to _attempt_ a 32KiB allocation * to reduce number of system calls on dump operations, if user * ever provided a big enough buffer. */ @@ -2301,7 +2301,7 @@ static int netlink_dump(struct sock *sk, bool lock_taken) goto errout_skb; /* Trim skb to allocated size. User is expected to provide buffer as - * large as max(min_dump_alloc, 16KiB (mac_recvmsg_len capped at + * large as max(min_dump_alloc, 32KiB (max_recvmsg_len capped at * netlink_recvmsg())). dump will pack as many smaller messages as * could fit within the allocated skb. skb is typically allocated * with larger space than required (could be as much as near 2x the