From mboxrd@z Thu Jan 1 00:00:00 1970 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 A766A25228C; Sun, 1 Mar 2026 01:37:06 +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=1772329026; cv=none; b=RiHTpxj3+HAijyxrNe+9rtLUFhwRkSTO54C5p9OyDGy9/09KZkfHNcRFOURZz68Vs+evmNlvkW/wO62z6riXyleFnnuvhnv5IuzE4eo887NQ8va8UujsB6DeKjSJoxKvJ4/MT/YC5H467tXJ/xqjMoSgzdMzM811rpnxVGJENx8= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1772329026; c=relaxed/simple; bh=oxvsOiSz8L10aYUgdUWLx5H2u+roGuxFUc7QI/f11fM=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=muKuL4BGvZDxnmQlKvS1a2xcmE0KE1dmBcbhxW0O6SfXVioMCPXB5ggBo8QK25J4aKiC2itebqBtFvQl+2FNy9dEqimDUfXzdJef5StNv5fdoG1xY7cxGrOfdvcvM/2e8EQD8OP/ykC4XpACdeo6cyx835ppUtcwS3eiOEB5e/A= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=hOzVbkDh; 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="hOzVbkDh" Received: by smtp.kernel.org (Postfix) with ESMTPSA id A3C9AC19421; Sun, 1 Mar 2026 01:37:05 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1772329026; bh=oxvsOiSz8L10aYUgdUWLx5H2u+roGuxFUc7QI/f11fM=; h=From:To:Cc:Subject:Date:From; b=hOzVbkDhRaJ9Y1E0TaTnyxQ0B27URgR5/CK+10Nxv3DjXXmivU2RHDGBg3rgvPrcU fnIGAoccd9kG+f6M8G8C5cc0V/L72pJXfomzvQITcxXHiLsKbG76YASWwPrEs5p5Gr zgnTvP9ZkaSgECOYBuNLNWqi8uFLQl6FJuGEP6M+qxxBSHpzp/uF/Ild/Esr6t/sQb 60KIRLBkNU8xvzuAgZ4mBq0et43FUJtpDYWQ5gPSvT4PPI1CtSyT81/E0ET8hM5Ih9 7tc/AWshL+flEfi2uAhcAq7HjEk0oILukMBxSjwhFuqrOtiHjJp2/OnpaRx4p2vWng yM28OHnr12NUw== From: Sasha Levin To: stable@vger.kernel.org, metze@samba.org Cc: Steve French , Tom Talpey , Long Li , Namjae Jeon , linux-cifs@vger.kernel.org, samba-technical@lists.samba.org, Steve French Subject: FAILED: Patch "smb: smbdirect: introduce smbdirect_socket.send_io.bcredits.*" failed to apply to 6.6-stable tree Date: Sat, 28 Feb 2026 20:37:04 -0500 Message-ID: <20260301013704.1697258-1-sashal@kernel.org> X-Mailer: git-send-email 2.51.0 Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Patchwork-Hint: ignore X-stable: review Content-Transfer-Encoding: 8bit The patch below does not apply to the 6.6-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to . Thanks, Sasha ------------------ original commit in Linus's tree ------------------ >From 8e94268b21c8235d430ce1aa6dc0b15952744b9b Mon Sep 17 00:00:00 2001 From: Stefan Metzmacher Date: Thu, 22 Jan 2026 18:16:42 +0100 Subject: [PATCH] smb: smbdirect: introduce smbdirect_socket.send_io.bcredits.* It turns out that our code will corrupt the stream of reassabled data transfer messages when we trigger an immendiate (empty) send. In order to fix this we'll have a single 'batch' credit per connection. And code getting that credit is free to use as much messages until remaining_length reaches 0, then the batch credit it given back and the next logical send can happen. Cc: # 6.18.x Cc: Steve French Cc: Tom Talpey Cc: Long Li Cc: Namjae Jeon Cc: linux-cifs@vger.kernel.org Cc: samba-technical@lists.samba.org Signed-off-by: Stefan Metzmacher Acked-by: Namjae Jeon Signed-off-by: Steve French --- fs/smb/common/smbdirect/smbdirect_socket.h | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) diff --git a/fs/smb/common/smbdirect/smbdirect_socket.h b/fs/smb/common/smbdirect/smbdirect_socket.h index 403a8b2cd30e4..95265192bb01b 100644 --- a/fs/smb/common/smbdirect/smbdirect_socket.h +++ b/fs/smb/common/smbdirect/smbdirect_socket.h @@ -162,6 +162,17 @@ struct smbdirect_socket { mempool_t *pool; } mem; + /* + * This is a coordination for smbdirect_send_batch. + * + * There's only one possible credit, which means + * only one instance is running at a time. + */ + struct { + atomic_t count; + wait_queue_head_t wait_queue; + } bcredits; + /* * The local credit state for ib_post_send() */ @@ -371,6 +382,9 @@ static __always_inline void smbdirect_socket_init(struct smbdirect_socket *sc) INIT_DELAYED_WORK(&sc->idle.timer_work, __smbdirect_socket_disabled_work); disable_delayed_work_sync(&sc->idle.timer_work); + atomic_set(&sc->send_io.bcredits.count, 0); + init_waitqueue_head(&sc->send_io.bcredits.wait_queue); + atomic_set(&sc->send_io.lcredits.count, 0); init_waitqueue_head(&sc->send_io.lcredits.wait_queue); @@ -485,6 +499,8 @@ struct smbdirect_send_batch { */ bool need_invalidate_rkey; u32 remote_key; + + int credit; }; struct smbdirect_recv_io { -- 2.51.0