netdev - Re: [PATCH 1/2 net-next v6] igc: avoid kernel warning when changing RX ring parameters

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Date:   Wed, 26 Jan 2022 09:13:16 -0800
From:   Vinicius Costa Gomes <vinicius.gomes@...el.com>
To:     Corinna Vinschen <vinschen@...hat.com>, intel-wired-lan@...osl.org,
        netdev@...r.kernel.org
Cc:     Lennert Buytenhek <buytenh@...tstofly.org>,
        Alexander Lobakin <alexandr.lobakin@...el.com>
Subject: Re: [PATCH 1/2 net-next v6] igc: avoid kernel warning when changing
 RX ring parameters

Corinna Vinschen <vinschen@...hat.com> writes:

> Calling ethtool changing the RX ring parameters like this:
>
>   $ ethtool -G eth0 rx 1024
>
> on igc triggers kernel warnings like this:
>
> [  225.198467] ------------[ cut here ]------------
> [  225.198473] Missing unregister, handled but fix driver
> [  225.198485] WARNING: CPU: 7 PID: 959 at net/core/xdp.c:168
> xdp_rxq_info_reg+0x79/0xd0
> [...]
> [  225.198601] Call Trace:
> [  225.198604]  <TASK>
> [  225.198609]  igc_setup_rx_resources+0x3f/0xe0 [igc]
> [  225.198617]  igc_ethtool_set_ringparam+0x30e/0x450 [igc]
> [  225.198626]  ethnl_set_rings+0x18a/0x250
> [  225.198631]  genl_family_rcv_msg_doit+0xca/0x110
> [  225.198637]  genl_rcv_msg+0xce/0x1c0
> [  225.198640]  ? rings_prepare_data+0x60/0x60
> [  225.198644]  ? genl_get_cmd+0xd0/0xd0
> [  225.198647]  netlink_rcv_skb+0x4e/0xf0
> [  225.198652]  genl_rcv+0x24/0x40
> [  225.198655]  netlink_unicast+0x20e/0x330
> [  225.198659]  netlink_sendmsg+0x23f/0x480
> [  225.198663]  sock_sendmsg+0x5b/0x60
> [  225.198667]  __sys_sendto+0xf0/0x160
> [  225.198671]  ? handle_mm_fault+0xb2/0x280
> [  225.198676]  ? do_user_addr_fault+0x1eb/0x690
> [  225.198680]  __x64_sys_sendto+0x20/0x30
> [  225.198683]  do_syscall_64+0x38/0x90
> [  225.198687]  entry_SYSCALL_64_after_hwframe+0x44/0xae
> [  225.198693] RIP: 0033:0x7f7ae38ac3aa
>
> igc_ethtool_set_ringparam() copies the igc_ring structure but neglects to
> reset the xdp_rxq_info member before calling igc_setup_rx_resources().
> This in turn calls xdp_rxq_info_reg() with an already registered xdp_rxq_info.
>
> Make sure to unregister the xdp_rxq_info structure first in
> igc_setup_rx_resources.
>
> Fixes: 73f1071c1d29 ("igc: Add support for XDP_TX action")
> Reported-by: Lennert Buytenhek <buytenh@...sta.com>
> Signed-off-by: Corinna Vinschen <vinschen@...hat.com>
> ---

Acked-by: Vinicius Costa Gomes <vinicius.gomes@...el.com>


-- 
Vinicius