netdev - Re: [PATCH net-next v2 1/3] netdevsim: Introduce support for L3 offload xstats

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:   Fri, 11 Mar 2022 12:56:10 -0800
From:   Jakub Kicinski <kuba@...nel.org>
To:     Petr Machata <petrm@...dia.com>
Cc:     <netdev@...r.kernel.org>, "David S. Miller" <davem@...emloft.net>,
        Ido Schimmel <idosch@...dia.com>
Subject: Re: [PATCH net-next v2 1/3] netdevsim: Introduce support for L3
 offload xstats

On Fri, 11 Mar 2022 15:41:22 +0100 Petr Machata wrote:
> Add support for testing of HW stats support that was added recently, namely
> the L3 stats support. L3 stats are provided for devices for which the L3
> stats have been turned on, and that were enabled for netdevsim through a
> debugfs toggle:
> 
>     # echo $ifindex > /sys/kernel/debug/netdevsim/$DEV/hwstats/l3/enable_ifindex
> 
> For fully enabled netdevices, netdevsim counts 10pps of ingress traffic and
> 20pps of egress traffic. Similarly, L3 stats can be disabled for a given
> device, and netdevsim ceases pretending there is any HW traffic going on:
> 
>     # echo $ifindex > /sys/kernel/debug/netdevsim/$DEV/hwstats/l3/disable_ifindex
> 
> Besides this, there is a third toggle to mark a device for future failure:
> 
>     # echo $ifindex > /sys/kernel/debug/netdevsim/$DEV/hwstats/l3/fail_next_enable
> 
> A future request to enable L3 stats on such netdevice will be bounced by
> netdevsim:
> 
>     # ip -j l sh dev d | jq '.[].ifindex'
>     66
>     # echo 66 > /sys/kernel/debug/netdevsim/netdevsim10/hwstats/l3/enable_ifindex
>     # echo 66 > /sys/kernel/debug/netdevsim/netdevsim10/hwstats/l3/fail_next_enable
>     # ip stats set dev d l3_stats on
>     Error: netdevsim: Stats enablement set to fail.
> 
> Signed-off-by: Petr Machata <petrm@...dia.com>

Acked-by: Jakub Kicinski <kuba@...nel.org>