netdev - Re: [PATCH v2 bpf-next 13/22] xsk: report ZC multi-buffer capability via xdp

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Date: Tue, 30 May 2023 14:31:20 +0200
From: Maciej Fijalkowski <maciej.fijalkowski@...el.com>
To: Simon Horman <simon.horman@...igine.com>
CC: <bpf@...r.kernel.org>, <ast@...nel.org>, <daniel@...earbox.net>,
	<andrii@...nel.org>, <netdev@...r.kernel.org>, <magnus.karlsson@...el.com>,
	<bjorn@...nel.org>, <tirthendu.sarkar@...el.com>
Subject: Re: [PATCH v2 bpf-next 13/22] xsk: report ZC multi-buffer capability
 via xdp_features

On Tue, May 30, 2023 at 01:55:45PM +0200, Simon Horman wrote:
> On Mon, May 29, 2023 at 05:50:15PM +0200, Maciej Fijalkowski wrote:
> > Introduce new xdp_feature NETDEV_XDP_ACT_NDO_ZC_SG that will be used to
> > find out if user space that wants to do ZC multi-buffer will be able to
> > do so against underlying ZC driver.
> > 
> > Signed-off-by: Maciej Fijalkowski <maciej.fijalkowski@...el.com>
> > ---
> >  include/uapi/linux/netdev.h | 4 ++--
> >  net/xdp/xsk_buff_pool.c     | 6 ++++++
> >  2 files changed, 8 insertions(+), 2 deletions(-)
> > 
> > diff --git a/include/uapi/linux/netdev.h b/include/uapi/linux/netdev.h
> > index 639524b59930..bfca07224f7b 100644
> > --- a/include/uapi/linux/netdev.h
> > +++ b/include/uapi/linux/netdev.h
> > @@ -33,8 +33,8 @@ enum netdev_xdp_act {
> >  	NETDEV_XDP_ACT_HW_OFFLOAD = 16,
> >  	NETDEV_XDP_ACT_RX_SG = 32,
> >  	NETDEV_XDP_ACT_NDO_XMIT_SG = 64,
> > -
> > -	NETDEV_XDP_ACT_MASK = 127,
> > +	NETDEV_XDP_ACT_NDO_ZC_SG = 128,
> 
> Hi Maciej,
> 
> Please consider adding NETDEV_XDP_ACT_NDO_ZC_SG to the Kernel doc
> a just above netdev_xdp_act.

right, my bad. i'll do this in next rev but i'd like to gather more
feedback from people. thanks once again for spotting an issue.

> 
> > +	NETDEV_XDP_ACT_MASK = 255,
> >  };
> >  
> >  enum {
> 
> ...