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

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Date:   Mon, 27 Apr 2020 10:48:14 -0700
From:   John Fastabend <john.fastabend@...il.com>
To:     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

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.