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selftests/xsk: add test when some packets are XDP_DROPed 

Add a new test where some of the packets are not passed to the AF_XDP
socket and instead get a XDP_DROP verdict. This is important as it
tests the recycling mechanism of the buffer pool. If a packet is not
sent to the AF_XDP socket, the buffer the packet resides in is instead
recycled so it can be used again without the round-trip to user
space. The test introduces a new XDP program that drops every other
packet.

Signed-off-by: Magnus Karlsson <magnus.karlsson@intel.com>
Acked-by: Maciej Fijalkowski <maciej.fijalkowski@intel.com>
Link: https://lore.kernel.org/r/20230111093526.11682-13-magnus.karlsson@gmail.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Magnus Karlsson 2023-01-11 10:35:23 +01:00 committed by Alexei Starovoitov
parent f0a249df1b
commit 80bea9acab
3 changed files with 43 additions and 0 deletions
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11
tools/testing/selftests/bpf/progs/xsk_xdp_progs.c
View File

@ -11,9 +11,20 @@ struct {
__uint(value_size, sizeof(int));
} xsk SEC(".maps");
static unsigned int idx;
SEC("xdp") int xsk_def_prog(struct xdp_md *xdp)
{
return bpf_redirect_map(&xsk, 0, XDP_DROP);
}
SEC("xdp") int xsk_xdp_drop(struct xdp_md *xdp)
{
/* Drop every other packet */
if (idx++ % 2)
return XDP_DROP;
return bpf_redirect_map(&xsk, 0, XDP_DROP);
}
char _license[] SEC("license") = "GPL";

31
tools/testing/selftests/bpf/xskxceiver.c
View File

@ -1646,6 +1646,34 @@ static void testapp_invalid_desc(struct test_spec *test)
pkt_stream_restore_default(test);
}
static void testapp_xdp_drop(struct test_spec *test)
{
struct ifobject *ifobj = test->ifobj_rx;
int err;
test_spec_set_name(test, "XDP_DROP_HALF");
xsk_detach_xdp_program(ifobj->ifindex, ifobj->xdp_flags);
err = xsk_attach_xdp_program(ifobj->xdp_progs->progs.xsk_xdp_drop, ifobj->ifindex,
ifobj->xdp_flags);
if (err) {
printf("Error attaching XDP_DROP program\n");
test->fail = true;
return;
}
pkt_stream_receive_half(test);
testapp_validate_traffic(test);
pkt_stream_restore_default(test);
xsk_detach_xdp_program(ifobj->ifindex, ifobj->xdp_flags);
err = xsk_attach_xdp_program(ifobj->xdp_progs->progs.xsk_def_prog, ifobj->ifindex,
ifobj->xdp_flags);
if (err) {
printf("Error restoring default XDP program\n");
exit_with_error(-err);
}
}
static int xsk_load_xdp_programs(struct ifobject *ifobj)
{
ifobj->xdp_progs = xsk_xdp_progs__open_and_load();
@ -1796,6 +1824,9 @@ static void run_pkt_test(struct test_spec *test, enum test_mode mode, enum test_
case TEST_TYPE_HEADROOM:
testapp_headroom(test);
break;
case TEST_TYPE_XDP_DROP_HALF:
testapp_xdp_drop(test);
break;
default:
break;
}

1
tools/testing/selftests/bpf/xskxceiver.h
View File

@ -87,6 +87,7 @@ enum test_type {
TEST_TYPE_STATS_RX_FULL,
TEST_TYPE_STATS_FILL_EMPTY,
TEST_TYPE_BPF_RES,
TEST_TYPE_XDP_DROP_HALF,
TEST_TYPE_MAX
};