netdev - RE: [PATCH v3 bpf-next 13/15] selftest: Add test for xdp

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Date:   Mon, 27 Apr 2020 10:52:11 -0700
From:   John Fastabend <john.fastabend@...il.com>
To:     John Fastabend <john.fastabend@...il.com>,
        David Ahern <dsahern@...nel.org>, netdev@...r.kernel.org
Cc:     davem@...emloft.net, kuba@...nel.org,
        prashantbhole.linux@...il.com, jasowang@...hat.com,
        brouer@...hat.com, toke@...hat.com, toshiaki.makita1@...il.com,
        daniel@...earbox.net, john.fastabend@...il.com, ast@...nel.org,
        kafai@...com, songliubraving@...com, yhs@...com, andriin@...com,
        dsahern@...il.com, David Ahern <dahern@...italocean.com>
Subject: RE: [PATCH v3 bpf-next 13/15] selftest: Add test for xdp_egress

John Fastabend wrote:
> David Ahern wrote:
> > From: David Ahern <dahern@...italocean.com>
> > 
> > Add selftest for xdp_egress. Add xdp_drop program to veth connecting
> > a namespace to drop packets and break connectivity.
> > 
> > Signed-off-by: David Ahern <dahern@...italocean.com>
> > ---
> 
> [...]
> 
> > +################################################################################
> > +# main
> > +
> > +if [ $(id -u) -ne 0 ]; then
> > +	echo "selftests: $TESTNAME [SKIP] Need root privileges"
> > +	exit $ksft_skip
> > +fi
> > +
> > +if ! ip link set dev lo xdp off > /dev/null 2>&1; then
> > +	echo "selftests: $TESTNAME [SKIP] Could not run test without the ip xdp support"
> > +	exit $ksft_skip
> > +fi
> > +
> > +if [ -z "$BPF_FS" ]; then
> > +	echo "selftests: $TESTNAME [SKIP] Could not run test without bpffs mounted"
> > +	exit $ksft_skip
> > +fi
> > +
> > +if ! bpftool version > /dev/null 2>&1; then
> > +	echo "selftests: $TESTNAME [SKIP] Could not run test without bpftool"
> > +	exit $ksft_skip
> > +fi
> 
> This is consistent with test_xdp_veth.sh so it is probably ok for this series
> but I think it would be nice to go back and make these fail on errors. Or at
> least fail on bpffs mount. Seems other tests fail on bpffs mount failures so
> would be OK I think.
> 
> Otherwise LGTM.

Also would be nice to have a test case for the xdp redirect into tx case. I think
this is only going to test the skb path?

Thanks,
John