netdev - Re: [PATCH iproute2] dcb: unblock mnl_socket

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Message-ID: <20221020155936.0868a482@hermes.local>
Date:   Thu, 20 Oct 2022 15:59:36 -0700
From:   Stephen Hemminger <stephen@...workplumber.org>
To:     Hao Lan <lanhao@...wei.com>
Cc:     <lipeng321@...wei.com>, <shenjian15@...wei.com>,
        <huangguangbin2@...wei.com>, <chenjunxin1@...wei.com>,
        <netdev@...r.kernel.org>, <dsahern@...nel.org>,
        <davem@...emloft.net>, <edumazet@...gle.com>, <kuba@...nel.org>,
        <pabeni@...hat.com>
Subject: Re: [PATCH iproute2] dcb: unblock mnl_socket_recvfrom if not
 message received

On Wed, 19 Oct 2022 09:20:08 +0800
Hao Lan <lanhao@...wei.com> wrote:

> From: Junxin Chen <chenjunxin1@...wei.com>
> 
> Currently, the dcb command sinks to the kernel through the netlink
> to obtain information. However, if the kernel fails to obtain infor-
> mation or is not processed, the dcb command is suspended.
> 
> For example, if we don't implement dcbnl_ops->ieee_getpfc in the
> kernel, the command "dcb pfc show dev eth1" will be stuck and subsequent
> commands cannot be executed.
> 
> This patch adds the NLM_F_ACK flag to the netlink in mnlu_msg_prepare
> to ensure that the kernel responds to user requests.
> 
> After the problem is solved, the execution result is as follows:
> $ dcb pfc show dev eth1
> Attribute not found: Success
> 
> Fixes: 67033d1c1c ("Add skeleton of a new tool, dcb")
> Signed-off-by: Junxin Chen <chenjunxin1@...wei.com>

Applied, fixed these two checkpatch warnings in original submission.

WARNING: Please use correct Fixes: style 'Fixes: <12 chars of sha1> ("<title line>")' - ie: 'Fixes: 67033d1c1c8a ("Add skeleton of a new tool, dcb")'
#74: 
Fixes: 67033d1c1c ("Add skeleton of a new tool, dcb")

WARNING: line length of 101 exceeds 100 columns
#89: FILE: dcb/dcb.c:159:
+	nlh = mnlu_msg_prepare(dcb->buf, nlmsg_type, NLM_F_REQUEST | NLM_F_ACK, &dcbm, sizeof(dcbm));

total: 0 errors, 2 warnings, 8 lines checked