netdev - Re: [PATCH net-next] tools: bpftool: try to mount bpffs if required for pinning objects

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Date:   Thu, 26 Oct 2017 17:53:33 +0900 (KST)
From:   David Miller <davem@...emloft.net>
To:     jakub.kicinski@...ronome.com
Cc:     netdev@...r.kernel.org, oss-drivers@...ronome.com,
        alexei.starovoitov@...il.com, daniel@...earbox.net,
        quentin.monnet@...ronome.com
Subject: Re: [PATCH net-next] tools: bpftool: try to mount bpffs if
 required for pinning objects

From: Jakub Kicinski <jakub.kicinski@...ronome.com>
Date: Tue, 24 Oct 2017 20:11:28 -0700

> From: Quentin Monnet <quentin.monnet@...ronome.com>
> 
> One possible cause of failure for `bpftool {prog|map} pin * file FILE`
> is the FILE not being in an eBPF virtual file system (bpffs). In this
> case, make bpftool attempt to mount bpffs on the parent directory of the
> FILE. Then, if this operation is successful, try again to pin the
> object.
> 
> The code for mnt_bpffs() is a copy of function bpf_mnt_fs() from
> iproute2 package (under lib/bpf.c, taken at commit 4b73d52f8a81), with
> modifications regarding handling of error messages.
> 
> Signed-off-by: Quentin Monnet <quentin.monnet@...ronome.com>
> Signed-off-by: Jakub Kicinski <jakub.kicinski@...ronome.com>

Applied.