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 4A55C351E9F; Mon, 5 May 2025 22:40:41 +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=1746484842; cv=none; b=o1VT1R8Hc+5ogcuUbZF7A7zT/7IWgIBXsgA22I8kA40kBjBmFkfkbI29soigcMixTEAosKbTgiz6lKfrW2FLuyp+ShGvq1pZyhv/68YdNXam9VhycWr5DgqVMj+8wWkGc5o4Ah4i8GGTRglibBM4GwjVAAVBKe5XcvTQXKn+A9Q= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1746484842; c=relaxed/simple; bh=NDScpiGe6m4cQ6PmgWo5FbR4UNAHpnYJHvCxgasYht4=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=dnRNaePJVM0lBfwnZKs3uIbdJDStctdWjWsd1N9RYkGMZV1qDxdkEtk5iinnm74FjB513IoQzP11x4xrdg5iZIqCsL6fbs4xFCeNiZj3oIFsaDqEQvLl9X6oDR2EmFBR33BIY8U9VksQxqqN1LxMEl4dnTv0rmzET/lfFVdgid8= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=Ov4dcVHY; 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="Ov4dcVHY" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 3A2A7C4CEEF; Mon, 5 May 2025 22:40:41 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1746484841; bh=NDScpiGe6m4cQ6PmgWo5FbR4UNAHpnYJHvCxgasYht4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Ov4dcVHYqo40sDK8rUhcBRUI0iLL54g/MaAC74+Hwyf9i19q4ThRR0mUMNpejA0c7 c7C4p1xyliyVvtNRRuqiHhBYKs2RhIofPWe0vo392w00xIVEPCkX8mcpOpbxwtXbmJ qz3FoL9Sa0sJNqx1400f+X1K+LZvayc0bWr8SzlrENKaGIKIizq/2oj/XD0N7vSEVs j/WoEHIBZS5qjrBcaoiTLZAWq488P+XrLgZtl/U57oUjSK/nTi0tTpgoJLCty8eAw3 K+QuVaRNz9krLzwVMgii5qIMhvY00pKklCr9FyddUTIvDrHISFMuB2NLt9bWZMBysi 87THvtGNQ1eUA== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Jing Su , Jakub Kicinski , Sasha Levin Subject: [PATCH AUTOSEL 6.12 042/486] dql: Fix dql->limit value when reset. Date: Mon, 5 May 2025 18:31:58 -0400 Message-Id: <20250505223922.2682012-42-sashal@kernel.org> X-Mailer: git-send-email 2.39.5 In-Reply-To: <20250505223922.2682012-1-sashal@kernel.org> References: <20250505223922.2682012-1-sashal@kernel.org> Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore X-stable-base: Linux 6.12.26 Content-Transfer-Encoding: 8bit From: Jing Su [ Upstream commit 3a17f23f7c36bac3a3584aaf97d3e3e0b2790396 ] Executing dql_reset after setting a non-zero value for limit_min can lead to an unreasonable situation where dql->limit is less than dql->limit_min. For instance, after setting /sys/class/net/eth*/queues/tx-0/byte_queue_limits/limit_min, an ifconfig down/up operation might cause the ethernet driver to call netdev_tx_reset_queue, which in turn invokes dql_reset. In this case, dql->limit is reset to 0 while dql->limit_min remains non-zero value, which is unexpected. The limit should always be greater than or equal to limit_min. Signed-off-by: Jing Su Link: https://patch.msgid.link/Z9qHD1s/NEuQBdgH@pilot-ThinkCentre-M930t-N000 Signed-off-by: Jakub Kicinski Signed-off-by: Sasha Levin --- lib/dynamic_queue_limits.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/lib/dynamic_queue_limits.c b/lib/dynamic_queue_limits.c index e49deddd3de9f..7d1dfbb99b397 100644 --- a/lib/dynamic_queue_limits.c +++ b/lib/dynamic_queue_limits.c @@ -190,7 +190,7 @@ EXPORT_SYMBOL(dql_completed); void dql_reset(struct dql *dql) { /* Reset all dynamic values */ - dql->limit = 0; + dql->limit = dql->min_limit; dql->num_queued = 0; dql->num_completed = 0; dql->last_obj_cnt = 0; -- 2.39.5