netdev - Re: [PATCH net v2] xsk: fix __xsk_generic_xmit() error code when cq is full

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Message-ID: <Z8OgwFirBwWrdgH-@mini-arch>
Date: Sat, 1 Mar 2025 16:05:20 -0800
From: Stanislav Fomichev <stfomichev@...il.com>
To: Wang Liang <wangliang74@...wei.com>
Cc: bjorn@...nel.org, magnus.karlsson@...el.com,
	maciej.fijalkowski@...el.com, jonathan.lemon@...il.com,
	davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
	pabeni@...hat.com, horms@...nel.org, ast@...nel.org,
	daniel@...earbox.net, hawk@...nel.org, john.fastabend@...il.com,
	yuehaibing@...wei.com, zhangchangzhong@...wei.com,
	netdev@...r.kernel.org, bpf@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH net v2] xsk: fix __xsk_generic_xmit() error code when cq
 is full

On 02/27, Wang Liang wrote:
> When the cq reservation is failed, the error code is not set which is
> initialized to zero in __xsk_generic_xmit(). That means the packet is not
> send successfully but sendto() return ok.
> 
> Considering the impact on uapi, return -EAGAIN is a good idea. The cq is
> full usually because it is not released in time, try to send msg again is
> appropriate.
> 
> Suggested-by: Magnus Karlsson <magnus.karlsson@...il.com>
> Signed-off-by: Wang Liang <wangliang74@...wei.com>

Acked-by: Stanislav Fomichev <sdf@...ichev.me>