netdev - Re: [PATCH iwl-next v6 6/6] igb: Add AF

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Message-ID: <ZsNzLvH38p/cWwI0@boxer>
Date: Mon, 19 Aug 2024 18:30:38 +0200
From: Maciej Fijalkowski <maciej.fijalkowski@...el.com>
To: Kurt Kanzenbach <kurt@...utronix.de>
CC: Tony Nguyen <anthony.l.nguyen@...el.com>, Przemek Kitszel
	<przemyslaw.kitszel@...el.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>, Richard Cochran
	<richardcochran@...il.com>, Sriram Yagnaraman
	<sriram.yagnaraman@...csson.com>, Benjamin Steinke
	<benjamin.steinke@...s-audio.com>, Sebastian Andrzej Siewior
	<bigeasy@...utronix.de>, <intel-wired-lan@...ts.osuosl.org>,
	<netdev@...r.kernel.org>, <bpf@...r.kernel.org>, Sriram Yagnaraman
	<sriram.yagnaraman@....tech>
Subject: Re: [PATCH iwl-next v6 6/6] igb: Add AF_XDP zero-copy Tx support

On Fri, Aug 16, 2024 at 11:24:05AM +0200, Kurt Kanzenbach wrote:
> From: Sriram Yagnaraman <sriram.yagnaraman@....tech>
> 
> Add support for AF_XDP zero-copy transmit path.
> 
> A new TX buffer type IGB_TYPE_XSK is introduced to indicate that the Tx
> frame was allocated from the xsk buff pool, so igb_clean_tx_ring() and
> igb_clean_tx_irq() can clean the buffers correctly based on type.
> 
> igb_xmit_zc() performs the actual packet transmit when AF_XDP zero-copy is
> enabled. We share the TX ring between slow path, XDP and AF_XDP
> zero-copy, so we use the netdev queue lock to ensure mutual exclusion.
> 
> Signed-off-by: Sriram Yagnaraman <sriram.yagnaraman@....tech>
> [Kurt: Set olinfo_status in igb_xmit_zc() so that frames are transmitted,
>        Use READ_ONCE() for xsk_pool and check Tx disabled and carrier in
>        igb_xmit_zc()]
> Signed-off-by: Kurt Kanzenbach <kurt@...utronix.de>
> ---
>  drivers/net/ethernet/intel/igb/igb.h      |  2 +
>  drivers/net/ethernet/intel/igb/igb_main.c | 61 ++++++++++++++++++++++++++-----
>  drivers/net/ethernet/intel/igb/igb_xsk.c  | 59 ++++++++++++++++++++++++++++++
>  3 files changed, 112 insertions(+), 10 deletions(-)
> 

Reviewed-by: Maciej Fijalkowski <maciej.fijalkowski@...el.com>