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Message-ID: <b04eb1f8-b36a-9fce-5ae5-d4c770c36139@gmail.com>
Date: Tue, 1 Aug 2023 11:47:58 +0800
From: Leon Hwang <hffilwlqm@...il.com>
To: Jakub Kicinski <kuba@...nel.org>
Cc: ast@...nel.org, daniel@...earbox.net, john.fastabend@...il.com,
andrii@...nel.org, martin.lau@...ux.dev, song@...nel.org,
yonghong.song@...ux.dev, kpsingh@...nel.org, sdf@...gle.com,
haoluo@...gle.com, jolsa@...nel.org, davem@...emloft.net,
edumazet@...gle.com, pabeni@...hat.com, hawk@...nel.org,
rostedt@...dmis.org, mhiramat@...nel.org, mykolal@...com,
shuah@...nel.org, tangyeechou@...il.com, kernel-patches-bot@...com,
bpf@...r.kernel.org, linux-kernel@...r.kernel.org,
netdev@...r.kernel.org, linux-trace-kernel@...r.kernel.org,
linux-kselftest@...r.kernel.org
Subject: Re: [PATCH bpf-next v4 1/2] bpf, xdp: Add tracepoint to xdp attaching
failure
On 1/8/23 10:43, Jakub Kicinski wrote:
> On Sun, 30 Jul 2023 19:49:50 +0800 Leon Hwang wrote:
>> @@ -9472,6 +9473,7 @@ int bpf_xdp_link_attach(const union bpf_attr *attr, struct bpf_prog *prog)
>> struct bpf_link_primer link_primer;
>> struct bpf_xdp_link *link;
>> struct net_device *dev;
>> + struct netlink_ext_ack extack;
>
> This is not initialized. Also, while fixing that, move it up
> to maintain the line order by decreasing line length.
>
Thank you for your reviewing.
I'll fix it by initializing extack and moving the line to its appropriate position.
Thanks,
Leon
>> int err, fd;
>>
>> rtnl_lock();
>> @@ -9497,12 +9499,13 @@ int bpf_xdp_link_attach(const union bpf_attr *attr, struct bpf_prog *prog)
>> goto unlock;
>> }
>>
>> - err = dev_xdp_attach_link(dev, NULL, link);
>> + err = dev_xdp_attach_link(dev, &extack, link);
>> rtnl_unlock();
>>
>> if (err) {
>> link->dev = NULL;
>> bpf_link_cleanup(&link_primer);
>> + trace_bpf_xdp_link_attach_failed(extack._msg);
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