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From: Larysa Zaremba <larysa.zaremba@intel.com>
To: Jesper Dangaard Brouer <jbrouer@redhat.com>
Cc: bpf@vger.kernel.org, brouer@redhat.com, ast@kernel.org,
	daniel@iogearbox.net, andrii@kernel.org, martin.lau@linux.dev,
	song@kernel.org, yhs@fb.com, john.fastabend@gmail.com,
	kpsingh@kernel.org, sdf@google.com, haoluo@google.com,
	jolsa@kernel.org, David Ahern <dsahern@gmail.com>,
	Jakub Kicinski <kuba@kernel.org>,
	Willem de Bruijn <willemb@google.com>,
	Anatoly Burakov <anatoly.burakov@intel.com>,
	Alexander Lobakin <alexandr.lobakin@intel.com>,
	Magnus Karlsson <magnus.karlsson@gmail.com>,
	Maryam Tahhan <mtahhan@redhat.com>,
	xdp-hints@xdp-project.net, netdev@vger.kernel.org
Subject: [xdp-hints] Re: [PATCH bpf-next v2 20/20] selftests/bpf: check checksum level in xdp_metadata
Date: Thu, 6 Jul 2023 14:02:00 +0200	[thread overview]
Message-ID: <ZKatOMUMTfbhd5Y0@lincoln> (raw)
In-Reply-To: <cb8f65a9-30ac-ee6e-3368-e653a72dfaaf@redhat.com>

On Thu, Jul 06, 2023 at 12:25:10PM +0200, Jesper Dangaard Brouer wrote:
> 
> 
> On 03/07/2023 20.12, Larysa Zaremba wrote:
> > Verify, whether kfunc in xdp_metadata test correctly returns checksum level
> > of zero.
> > 
> > Signed-off-by: Larysa Zaremba <larysa.zaremba@intel.com>
> > ---
> >   tools/testing/selftests/bpf/prog_tests/xdp_metadata.c | 3 +++
> >   tools/testing/selftests/bpf/progs/xdp_metadata.c      | 7 +++++++
> >   2 files changed, 10 insertions(+)
> > 
> > diff --git a/tools/testing/selftests/bpf/prog_tests/xdp_metadata.c b/tools/testing/selftests/bpf/prog_tests/xdp_metadata.c
> > index 50ac9f570bc5..6c71d712932e 100644
> > --- a/tools/testing/selftests/bpf/prog_tests/xdp_metadata.c
> > +++ b/tools/testing/selftests/bpf/prog_tests/xdp_metadata.c
> > @@ -228,6 +228,9 @@ static int verify_xsk_metadata(struct xsk *xsk)
> >   	if (!ASSERT_EQ(meta->rx_vlan_proto, VLAN_PID, "rx_vlan_proto"))
> >   		return -1;
> > +	if (!ASSERT_NEQ(meta->rx_csum_lvl, 0, "rx_csum_lvl"))
> > +		return -1;
> 
> Not-equal ("NEQ") to 0 feels weird here.
> Below you set meta->rx_csum_lvl=1 in case meta->rx_csum_lvl==0.
> 
> Thus, test can pass if meta->rx_csum_lvl happens to be a random value.
> We could set meta->rx_csum_lvl to 42 in case meta->rx_csum_lvl==0, and
> then use a ASSERT_EQ==42 to be more certain of the case we are testing are
> fulfilled.
>

I just copied the approach used for timestamp. I think you are right and I 
should have make the new code better.

ASSERT_NEQ(0) is also used for rx_hash. It would be a good idea to go and fix 
those too, but the patchset has already ballooned too much for me, so I would 
leave it for later.

With ASSERT_EQ for checksum level, I think comparing it to "1" should be enough. 
Do I guess correctly, the main problem with ASSERT_NEQ is uninitialized memory?
 
Another value that is less magical than 42 would be "4", because csum_level 
takes 2 bits, so it is the smallest value that does not correspod to 
any valid checksum level.
 
> 
> > +
> >   	xsk_ring_cons__release(&xsk->rx, 1);
> >   	refill_rx(xsk, comp_addr);
> > diff --git a/tools/testing/selftests/bpf/progs/xdp_metadata.c b/tools/testing/selftests/bpf/progs/xdp_metadata.c
> > index 382984a5d1c9..6f7223d581b7 100644
> > --- a/tools/testing/selftests/bpf/progs/xdp_metadata.c
> > +++ b/tools/testing/selftests/bpf/progs/xdp_metadata.c
> > @@ -26,6 +26,8 @@ extern int bpf_xdp_metadata_rx_hash(const struct xdp_md *ctx, __u32 *hash,
> >   extern int bpf_xdp_metadata_rx_vlan_tag(const struct xdp_md *ctx,
> >   					__u16 *vlan_tag,
> >   					__be16 *vlan_proto) __ksym;
> > +extern int bpf_xdp_metadata_rx_csum_lvl(const struct xdp_md *ctx,
> > +					__u8 *csum_level) __ksym;
> >   SEC("xdp")
> >   int rx(struct xdp_md *ctx)
> > @@ -62,6 +64,11 @@ int rx(struct xdp_md *ctx)
> >   	bpf_xdp_metadata_rx_hash(ctx, &meta->rx_hash, &meta->rx_hash_type);
> >   	bpf_xdp_metadata_rx_vlan_tag(ctx, &meta->rx_vlan_tag, &meta->rx_vlan_proto);
> > +	/* Same as with timestamp, zero is expected */
> > +	ret = bpf_xdp_metadata_rx_csum_lvl(ctx, &meta->rx_csum_lvl);
> > +	if (!ret && meta->rx_csum_lvl == 0)
> > +		meta->rx_csum_lvl = 1;
> > +
> 
> IMHO it is more human-readable-code to rename "ret" variable "err".
> 
> I know you are just reusing variable "ret", so it's not really your fault.
> 
> 
> 
> >   	return bpf_redirect_map(&xsk, ctx->rx_queue_index, XDP_PASS);
> >   }
> 

      reply	other threads:[~2023-07-06 12:06 UTC|newest]

Thread overview: 66+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-07-03 18:12 [xdp-hints] [PATCH bpf-next v2 00/20] XDP metadata via kfuncs for ice Larysa Zaremba
2023-07-03 18:12 ` [xdp-hints] [PATCH bpf-next v2 01/20] ice: make RX hash reading code more reusable Larysa Zaremba
2023-07-03 18:12 ` [xdp-hints] [PATCH bpf-next v2 02/20] ice: make RX HW timestamp " Larysa Zaremba
2023-07-04 10:04   ` [xdp-hints] " Larysa Zaremba
2023-07-03 18:12 ` [xdp-hints] [PATCH bpf-next v2 03/20] ice: make RX checksum checking " Larysa Zaremba
2023-07-03 18:12 ` [xdp-hints] [PATCH bpf-next v2 04/20] ice: Make ptype internal to descriptor info processing Larysa Zaremba
2023-07-03 18:12 ` [xdp-hints] [PATCH bpf-next v2 05/20] ice: Introduce ice_xdp_buff Larysa Zaremba
2023-07-03 18:12 ` [xdp-hints] [PATCH bpf-next v2 06/20] ice: Support HW timestamp hint Larysa Zaremba
2023-07-05 17:30   ` [xdp-hints] " Stanislav Fomichev
2023-07-06 14:22     ` Larysa Zaremba
2023-07-06 16:39       ` Stanislav Fomichev
2023-07-10 15:49         ` Larysa Zaremba
2023-07-10 18:12           ` Stanislav Fomichev
2023-07-03 18:12 ` [xdp-hints] [PATCH bpf-next v2 07/20] ice: Support RX hash XDP hint Larysa Zaremba
2023-07-03 18:12 ` [xdp-hints] [PATCH bpf-next v2 08/20] ice: Support XDP hints in AF_XDP ZC mode Larysa Zaremba
2023-07-03 18:12 ` [xdp-hints] [PATCH bpf-next v2 09/20] xdp: Add VLAN tag hint Larysa Zaremba
2023-07-03 20:15   ` [xdp-hints] " John Fastabend
2023-07-04  8:23     ` Larysa Zaremba
2023-07-04 10:23       ` Jesper Dangaard Brouer
2023-07-04 11:02         ` Larysa Zaremba
2023-07-04 14:18           ` Jesper Dangaard Brouer
2023-07-06 14:46             ` Larysa Zaremba
2023-07-07 13:57               ` Jesper Dangaard Brouer
2023-07-07 17:58                 ` Larysa Zaremba
2023-07-03 18:12 ` [xdp-hints] [PATCH bpf-next v2 10/20] ice: Implement " Larysa Zaremba
2023-07-03 18:12 ` [xdp-hints] [PATCH bpf-next v2 11/20] ice: use VLAN proto from ring packet context in skb path Larysa Zaremba
2023-07-03 18:12 ` [xdp-hints] [PATCH bpf-next v2 12/20] xdp: Add checksum level hint Larysa Zaremba
2023-07-03 20:38   ` [xdp-hints] " John Fastabend
2023-07-04  9:24     ` Larysa Zaremba
2023-07-04 10:39       ` Jesper Dangaard Brouer
2023-07-04 11:19         ` Larysa Zaremba
2023-07-06  5:50           ` John Fastabend
2023-07-06  9:04             ` Jesper Dangaard Brouer
2023-07-06 12:38               ` Larysa Zaremba
2023-07-06 12:49                 ` Larysa Zaremba
2023-07-10 16:58                   ` Alexander Lobakin
2023-07-03 18:12 ` [xdp-hints] [PATCH bpf-next v2 13/20] ice: Implement " Larysa Zaremba
2023-07-03 18:12 ` [xdp-hints] [PATCH bpf-next v2 14/20] selftests/bpf: Allow VLAN packets in xdp_hw_metadata Larysa Zaremba
2023-07-05 17:31   ` [xdp-hints] " Stanislav Fomichev
2023-07-03 18:12 ` [xdp-hints] [PATCH bpf-next v2 15/20] net, xdp: allow metadata > 32 Larysa Zaremba
2023-07-03 21:06   ` [xdp-hints] " John Fastabend
2023-07-06 14:51     ` Larysa Zaremba
2023-07-10 14:01       ` Alexander Lobakin
2023-07-03 18:12 ` [xdp-hints] [PATCH bpf-next v2 16/20] selftests/bpf: Add flags and new hints to xdp_hw_metadata Larysa Zaremba
2023-07-04 11:03   ` [xdp-hints] " Jesper Dangaard Brouer
2023-07-04 11:04     ` Larysa Zaremba
2023-07-03 18:12 ` [xdp-hints] [PATCH bpf-next v2 17/20] veth: Implement VLAN tag and checksum level XDP hint Larysa Zaremba
2023-07-05 17:25   ` [xdp-hints] " Stanislav Fomichev
2023-07-06  9:57     ` Jesper Dangaard Brouer
2023-07-06 10:15       ` Larysa Zaremba
2023-07-03 18:12 ` [xdp-hints] [PATCH bpf-next v2 18/20] selftests/bpf: Use AF_INET for TX in xdp_metadata Larysa Zaremba
2023-07-05 17:39   ` [xdp-hints] " Stanislav Fomichev
2023-07-06 14:11     ` Larysa Zaremba
2023-07-06 17:25       ` Stanislav Fomichev
2023-07-06 17:27       ` Stanislav Fomichev
2023-07-07  8:33         ` Larysa Zaremba
2023-07-07 16:49           ` Stanislav Fomichev
2023-07-07 16:58             ` Larysa Zaremba
2023-07-03 18:12 ` [xdp-hints] [PATCH bpf-next v2 19/20] selftests/bpf: Check VLAN tag and proto " Larysa Zaremba
2023-07-05 17:41   ` [xdp-hints] " Stanislav Fomichev
2023-07-06 10:10   ` Jesper Dangaard Brouer
2023-07-06 10:13     ` Larysa Zaremba
2023-07-03 18:12 ` [xdp-hints] [PATCH bpf-next v2 20/20] selftests/bpf: check checksum level " Larysa Zaremba
2023-07-05 17:41   ` [xdp-hints] " Stanislav Fomichev
2023-07-06 10:25   ` Jesper Dangaard Brouer
2023-07-06 12:02     ` Larysa Zaremba [this message]

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