linux-kernel - Re: 答复: 答复: [PATCH bpf-next] samples/bpf: check detach prog exist or not in xdp

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Message-ID: <877d6kcx5o.fsf@toke.dk>
Date:   Tue, 17 May 2022 11:42:59 +0200
From:   Toke Høiland-Jørgensen <toke@...nel.org>
To:     shaozhengchao <shaozhengchao@...wei.com>,
        "bpf@...r.kernel.org" <bpf@...r.kernel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "ast@...nel.org" <ast@...nel.org>,
        "daniel@...earbox.net" <daniel@...earbox.net>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "kuba@...nel.org" <kuba@...nel.org>,
        "hawk@...nel.org" <hawk@...nel.org>,
        "john.fastabend@...il.com" <john.fastabend@...il.com>,
        "andrii@...nel.org" <andrii@...nel.org>,
        "kafai@...com" <kafai@...com>,
        "songliubraving@...com" <songliubraving@...com>,
        "yhs@...com" <yhs@...com>,
        "kpsingh@...nel.org" <kpsingh@...nel.org>
Cc:     "weiyongjun (A)" <weiyongjun1@...wei.com>,
        yuehaibing <yuehaibing@...wei.com>
Subject: Re: 答复: 答复: [PATCH bpf-next] samples/bpf:
 check detach prog exist
 or not in xdp_fwd

> Could I add helper function to implement this function which can check
> the program name and see if it attach to the device.

You just need to call bpf_prog_get_fd_by_id() followed by
bpf_obj_get_info_by_fd(), and the program name will be in info.name.
Here's an example in libxdp where we pull out the prog name:

https://github.com/xdp-project/xdp-tools/blob/master/lib/libxdp/libxdp.c#L1165

-Toke