linux-kernel - Re: [PATCH net-next] xsk: make struct xsk_cb_desc available outside CONFIG_XDP

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Message-ID: <ZYF9+lhYT1i7dvDT@lzaremba-mobl.ger.corp.intel.com>
Date: Tue, 19 Dec 2023 12:26:50 +0100
From: Larysa Zaremba <larysa.zaremba@...el.com>
To: Vladimir Oltean <vladimir.oltean@....com>
CC: <netdev@...r.kernel.org>, <bpf@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, Randy Dunlap <rdunlap@...radead.org>, "Tony
 Nguyen" <anthony.l.nguyen@...el.com>, Björn Töpel
	<bjorn@...nel.org>, Magnus Karlsson <magnus.karlsson@...el.com>, "Maciej
 Fijalkowski" <maciej.fijalkowski@...el.com>, Jonathan Lemon
	<jonathan.lemon@...il.com>, "David S. Miller" <davem@...emloft.net>, "Eric
 Dumazet" <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>, Paolo Abeni
	<pabeni@...hat.com>, Alexei Starovoitov <ast@...nel.org>, Daniel Borkmann
	<daniel@...earbox.net>, Jesper Dangaard Brouer <hawk@...nel.org>, "John
 Fastabend" <john.fastabend@...il.com>
Subject: Re: [PATCH net-next] xsk: make struct xsk_cb_desc available outside
 CONFIG_XDP_SOCKETS

On Tue, Dec 19, 2023 at 01:02:05PM +0200, Vladimir Oltean wrote:
> The ice driver fails to build when CONFIG_XDP_SOCKETS is disabled.
> 
> drivers/net/ethernet/intel/ice/ice_base.c:533:21: error:
> variable has incomplete type 'struct xsk_cb_desc'
>         struct xsk_cb_desc desc = {};
>                            ^
> include/net/xsk_buff_pool.h:15:8: note:
> forward declaration of 'struct xsk_cb_desc'
> struct xsk_cb_desc;
>        ^
> 
> Fixes: d68d707dcbbf ("ice: Support XDP hints in AF_XDP ZC mode")
> Closes: https://lore.kernel.org/netdev/8b76dad3-8847-475b-aa17-613c9c978f7a@infradead.org/
> Signed-off-by: Vladimir Oltean <vladimir.oltean@....com>

This probably should go through bpf-next. Other than that, fix looks fine:

Acked-by: Larysa Zaremba <larysa.zaremba@...el.com>

> ---
> Posting to net-next since this tree is broken at this stage, not only
> bpf-next.
> 
>  include/net/xdp_sock_drv.h | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/include/net/xdp_sock_drv.h b/include/net/xdp_sock_drv.h
> index b62bb8525a5f..526c1e7f505e 100644
> --- a/include/net/xdp_sock_drv.h
> +++ b/include/net/xdp_sock_drv.h
> @@ -12,14 +12,14 @@
>  #define XDP_UMEM_MIN_CHUNK_SHIFT 11
>  #define XDP_UMEM_MIN_CHUNK_SIZE (1 << XDP_UMEM_MIN_CHUNK_SHIFT)
>  
> -#ifdef CONFIG_XDP_SOCKETS
> -
>  struct xsk_cb_desc {
>  	void *src;
>  	u8 off;
>  	u8 bytes;
>  };
>  
> +#ifdef CONFIG_XDP_SOCKETS
> +
>  void xsk_tx_completed(struct xsk_buff_pool *pool, u32 nb_entries);
>  bool xsk_tx_peek_desc(struct xsk_buff_pool *pool, struct xdp_desc *desc);
>  u32 xsk_tx_peek_release_desc_batch(struct xsk_buff_pool *pool, u32 max);
> -- 
> 2.34.1
>