netdev - Re: [PATCH net] vmxnet3: Fix missing reserved tailroom

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Date: Tue, 12 Mar 2024 11:56:39 +0100
From: Paolo Abeni <pabeni@...hat.com>
To: William Tu <witu@...dia.com>, netdev@...r.kernel.org
Cc: u9012063@...il.com, Martin Zaharinov <micron10@...il.com>, 
	alexanderduyck@...com, "<alexandr.lobakin@...el.com>  <;hawk@...nel.org>"
	 <daniel@...earbox.net>, bpf@...r.kernel.org, john.fastabend@...il.com, 
	pv-drivers@...are.com, doshir@...are.com
Subject: Re: [PATCH net] vmxnet3: Fix missing reserved tailroom

On Sat, 2024-03-09 at 20:31 +0200, William Tu wrote:
> Use rbi->len instead of rcd->len for non-dataring packet.
> 
> Found issue:
>   XDP_WARN: xdp_update_frame_from_buff(line:278): Driver BUG: missing reserved tailroom
>   WARNING: CPU: 0 PID: 0 at net/core/xdp.c:586 xdp_warn+0xf/0x20
>   CPU: 0 PID: 0 Comm: swapper/0 Tainted: G        W  O       6.5.1 #1
>   RIP: 0010:xdp_warn+0xf/0x20
>   ...
>   ? xdp_warn+0xf/0x20
>   xdp_do_redirect+0x15f/0x1c0
>   vmxnet3_run_xdp+0x17a/0x400 [vmxnet3]
>   vmxnet3_process_xdp+0xe4/0x760 [vmxnet3]
>   ? vmxnet3_tq_tx_complete.isra.0+0x21e/0x2c0 [vmxnet3]
>   vmxnet3_rq_rx_complete+0x7ad/0x1120 [vmxnet3]
>   vmxnet3_poll_rx_only+0x2d/0xa0 [vmxnet3]
>   __napi_poll+0x20/0x180
>   net_rx_action+0x177/0x390
> 
> Reported-by: Martin Zaharinov <micron10@...il.com>
> Tested-by: Martin Zaharinov <micron10@...il.com>
> Link: https://lore.kernel.org/netdev/74BF3CC8-2A3A-44FF-98C2-1E20F110A92E@gmail.com/
> Fixes: 54f00cce1178 ("vmxnet3: Add XDP support.")
> Signed-off-by: William Tu <witu@...dia.com>
> ---
> Note: this is a while ago in 2023, I forgot to send.
> https://lore.kernel.org/netdev/74BF3CC8-2A3A-44FF-98C2-1E20F110A92E@gmail.com/

The patch LGTM, but you omitted a quite long list of relevant
recipients, added now. Let's wait a bit more for some feedback.

Cheers,

Paolo