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From: "Zaremba, Larysa" <larysa.zaremba@intel.com>
To: Alexei Starovoitov <alexei.starovoitov@gmail.com>
Cc: Willem de Bruijn <willemdebruijn.kernel@gmail.com>,
	"bpf@vger.kernel.org" <bpf@vger.kernel.org>,
	"ast@kernel.org" <ast@kernel.org>,
	"daniel@iogearbox.net" <daniel@iogearbox.net>,
	"andrii@kernel.org" <andrii@kernel.org>,
	"martin.lau@linux.dev" <martin.lau@linux.dev>,
	"song@kernel.org" <song@kernel.org>, "yhs@fb.com" <yhs@fb.com>,
	"john.fastabend@gmail.com" <john.fastabend@gmail.com>,
	"kpsingh@kernel.org" <kpsingh@kernel.org>,
	"sdf@google.com" <sdf@google.com>,
	"haoluo@google.com" <haoluo@google.com>,
	"jolsa@kernel.org" <jolsa@kernel.org>,
	David Ahern <dsahern@gmail.com>, Jakub Kicinski <kuba@kernel.org>,
	Willem de Bruijn <willemb@google.com>,
	"Brouer, Jesper" <brouer@redhat.com>,
	"Burakov, Anatoly" <anatoly.burakov@intel.com>,
	"Lobakin, Aleksander" <aleksander.lobakin@intel.com>,
	Magnus Karlsson <magnus.karlsson@gmail.com>,
	"Tahhan, Maryam" <mtahhan@redhat.com>,
	"xdp-hints@xdp-project.net" <xdp-hints@xdp-project.net>,
	"netdev@vger.kernel.org" <netdev@vger.kernel.org>
Subject: [xdp-hints] Re: [PATCH bpf-next v3 13/21] ice: Implement checksum hint
Date: Thu, 20 Jul 2023 15:41:53 +0000	[thread overview]
Message-ID: <ZLlUyJdj50UqFM0m@lincoln> (raw)
In-Reply-To: <CAADnVQKF3j-_qLM4MWkJKK=ZyPuWrLnmGfgf9BC4zm-4=1qSfw@mail.gmail.com>

On Thu, Jul 20, 2023 at 08:14:52AM -0700, Alexei Starovoitov wrote:
> On Thu, Jul 20, 2023 at 2:47 AM Zaremba, Larysa
> <larysa.zaremba@intel.com> wrote:
> >
> > On Wed, Jul 19, 2023 at 05:51:17PM -0400, Willem de Bruijn wrote:
> > > Alexei Starovoitov wrote:
> > > > On Wed, Jul 19, 2023 at 08:37:26PM +0200, Larysa Zaremba wrote:
> > > > > Implement .xmo_rx_csum callback to allow XDP code to determine,
> > > > > whether HW has validated any checksums.
> > > > >
> > > > > Signed-off-by: Larysa Zaremba <larysa.zaremba@intel.com>
> > > > > ---
> > > > >  drivers/net/ethernet/intel/ice/ice_txrx_lib.c | 29 +++++++++++++++++++
> > > > >  1 file changed, 29 insertions(+)
> > > > >
> > > > > diff --git a/drivers/net/ethernet/intel/ice/ice_txrx_lib.c b/drivers/net/ethernet/intel/ice/ice_txrx_lib.c
> > > > > index 54685d0747aa..6647a7e55ac8 100644
> > > > > --- a/drivers/net/ethernet/intel/ice/ice_txrx_lib.c
> > > > > +++ b/drivers/net/ethernet/intel/ice/ice_txrx_lib.c
> > > > > @@ -660,8 +660,37 @@ static int ice_xdp_rx_vlan_tag(const struct xdp_md *ctx, u16 *vlan_tci,
> > > > >   return 0;
> > > > >  }
> > > > >
> > > > > +/**
> > > > > + * ice_xdp_rx_csum_lvl - Get level, at which HW has checked the checksum
> > > > > + * @ctx: XDP buff pointer
> > > > > + * @csum_status: destination address
> > > > > + * @csum_info: destination address
> > > > > + *
> > > > > + * Copy HW checksum level (if was checked) to the destination address.
> > > > > + */
> > > > > +static int ice_xdp_rx_csum(const struct xdp_md *ctx,
> > > > > +                    enum xdp_csum_status *csum_status,
> > > > > +                    union xdp_csum_info *csum_info)
> > > > > +{
> > > > > + const struct ice_xdp_buff *xdp_ext = (void *)ctx;
> > > > > + const union ice_32b_rx_flex_desc *eop_desc;
> > > > > + enum ice_rx_csum_status status;
> > > > > + u16 ptype;
> > > > > +
> > > > > + eop_desc = xdp_ext->pkt_ctx.eop_desc;
> > > > > + ptype = ice_get_ptype(eop_desc);
> > > > > +
> > > > > + status = ice_get_rx_csum_status(eop_desc, ptype);
> > > > > + if (status & ICE_RX_CSUM_NONE)
> > > > > +         return -ENODATA;
> > > > > +
> > > > > + *csum_status = ice_rx_csum_lvl(status) + 1;

I'll duplicate an improved version of this line from another thread in case it 
could help with the comprehension during review:

*csum_status = XDP_CHECKSUM_VALID_LVL0 + ice_rx_csum_lvl(status);

> > > > > + return 0;
> > > > > +}
> > > >
> > > > and xdp_csum_info from previous patch left uninitialized?
> > > > What was the point adding it then?
> > >
> > > I suppose this driver only returns CHECKSUM_NONE or
> > > CHECKSUM_UNNECESSARY? Also based on a grep of the driver dir.
> > >
> >
> > Yes, correct, current ice HW cannot produce complete checksum,
> > so only CHECKSUM_UNNECESSARY for known protocols, CHECKSUM_NONE otherwise,
> > nothing to initialize csum_info with in either case.
> >
> > xdp_csum_info is initialized in veth implementation though, but only
> > csum_start/offset, so complete XDP checksum has no users in this patchset.
> > Is this a problem?
> >
> > In previous version I had CHECKSUM_UNNECESSARY-only kfunc, but I think everyone
> > has agreed, csum hint kfunc should give more comprehensive output.
> 
> csum kfunc supposed to be generic.
> If for ICE it fills in one argument and for veth another then the whole
> idea of generic api is not working.

Both ice and veth fill in the csum_status, the need to fill in the csum_info is 
determined by the status. I don not see a problem with that.

Maybe you have an issue with putting a valid checksum number into a status 
instead of info? Please clarify.

  reply	other threads:[~2023-07-20 15:42 UTC|newest]

Thread overview: 50+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-07-19 18:37 [xdp-hints] [PATCH bpf-next v3 00/21] XDP metadata via kfuncs for ice Larysa Zaremba
2023-07-19 18:37 ` [xdp-hints] [PATCH bpf-next v3 01/21] ice: make RX hash reading code more reusable Larysa Zaremba
2023-07-19 18:37 ` [xdp-hints] [PATCH bpf-next v3 02/21] ice: make RX HW timestamp " Larysa Zaremba
2023-07-19 18:37 ` [xdp-hints] [PATCH bpf-next v3 03/21] ice: make RX checksum checking " Larysa Zaremba
2023-07-19 18:37 ` [xdp-hints] [PATCH bpf-next v3 04/21] ice: Make ptype internal to descriptor info processing Larysa Zaremba
2023-07-19 18:37 ` [xdp-hints] [PATCH bpf-next v3 05/21] ice: Introduce ice_xdp_buff Larysa Zaremba
2023-07-19 18:37 ` [xdp-hints] [PATCH bpf-next v3 06/21] ice: Support HW timestamp hint Larysa Zaremba
2023-07-19 18:37 ` [xdp-hints] [PATCH bpf-next v3 07/21] ice: Support RX hash XDP hint Larysa Zaremba
2023-07-19 18:37 ` [xdp-hints] [PATCH bpf-next v3 08/21] ice: Support XDP hints in AF_XDP ZC mode Larysa Zaremba
2023-07-19 18:37 ` [xdp-hints] [PATCH bpf-next v3 09/21] xdp: Add VLAN tag hint Larysa Zaremba
2023-07-20 21:49   ` [xdp-hints] " Stanislav Fomichev
2023-07-19 18:37 ` [xdp-hints] [PATCH bpf-next v3 10/21] ice: Implement " Larysa Zaremba
2023-07-20 18:50   ` [xdp-hints] " Simon Horman
2023-07-21  7:38     ` Zaremba, Larysa
2023-07-19 18:37 ` [xdp-hints] [PATCH bpf-next v3 11/21] ice: use VLAN proto from ring packet context in skb path Larysa Zaremba
2023-07-19 18:37 ` [xdp-hints] [PATCH bpf-next v3 12/21] xdp: Add checksum hint Larysa Zaremba
2023-07-19 21:42   ` [xdp-hints] " Willem de Bruijn
2023-07-20  9:57     ` Zaremba, Larysa
2023-07-20 10:10       ` Zaremba, Larysa
2023-07-20 13:55         ` Willem de Bruijn
2023-07-20 16:03           ` Zaremba, Larysa
2023-07-20 22:27             ` Willem de Bruijn
2023-07-21  8:01               ` Zaremba, Larysa
2023-07-19 18:37 ` [xdp-hints] [PATCH bpf-next v3 13/21] ice: Implement " Larysa Zaremba
2023-07-19 18:59   ` [xdp-hints] " Alexei Starovoitov
2023-07-19 21:51     ` Willem de Bruijn
2023-07-20  9:47       ` Zaremba, Larysa
2023-07-20 15:14         ` Alexei Starovoitov
2023-07-20 15:41           ` Zaremba, Larysa [this message]
2023-07-20 21:58             ` Stanislav Fomichev
2023-07-20 22:24               ` Willem de Bruijn
2023-07-19 18:37 ` [xdp-hints] [PATCH bpf-next v3 14/21] selftests/bpf: Allow VLAN packets in xdp_hw_metadata Larysa Zaremba
2023-07-20 21:58   ` [xdp-hints] " Stanislav Fomichev
2023-07-19 18:37 ` [xdp-hints] [PATCH bpf-next v3 15/21] net, xdp: allow metadata > 32 Larysa Zaremba
2023-07-19 18:37 ` [xdp-hints] [PATCH bpf-next v3 16/21] selftests/bpf: Add flags and new hints to xdp_hw_metadata Larysa Zaremba
2023-07-20 22:00   ` [xdp-hints] " Stanislav Fomichev
2023-07-21  7:41     ` Zaremba, Larysa
2023-07-19 18:37 ` [xdp-hints] [PATCH bpf-next v3 17/21] veth: Implement VLAN tag and checksum XDP hint Larysa Zaremba
2023-07-20 22:02   ` [xdp-hints] " Stanislav Fomichev
2023-07-19 18:37 ` [xdp-hints] [PATCH bpf-next v3 18/21] net: make vlan_get_tag() return -ENODATA instead of -EINVAL Larysa Zaremba
2023-07-20 22:02   ` [xdp-hints] " Stanislav Fomichev
2023-07-19 18:37 ` [xdp-hints] [PATCH bpf-next v3 19/21] selftests/bpf: Use AF_INET for TX in xdp_metadata Larysa Zaremba
2023-07-20 22:05   ` [xdp-hints] " Stanislav Fomichev
2023-07-19 18:37 ` [xdp-hints] [PATCH bpf-next v3 20/21] selftests/bpf: Check VLAN tag and proto " Larysa Zaremba
2023-07-20 22:14   ` [xdp-hints] " Stanislav Fomichev
2023-07-21  7:46     ` Zaremba, Larysa
2023-07-21 16:44       ` Stanislav Fomichev
2023-07-25  7:11         ` Larysa Zaremba
2023-07-19 18:37 ` [xdp-hints] [PATCH bpf-next v3 21/21] selftests/bpf: check checksum state " Larysa Zaremba
2023-07-20 22:14   ` [xdp-hints] " Stanislav Fomichev

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