[RFC bpf-next 19/23] selftests/bpf: Use AF_INET for TX in xdp_metadata

Larysa Zaremba
2023-08-24T19:34:37Z

The easiest way to simulate stripped VLAN tag in veth is to send a packet
from VLAN interface, attached to veth. Unfortunately, this approach is
incompatible with AF_XDP on TX side, because VLAN interfaces do not have
such feature.

Replace AF_XDP packet generation with sending the same datagram via
AF_INET socket.

This does not change the packet contents or hints values with one notable
exception: rx_hash_type, which previously was expected to be 0, now is
expected be at least XDP_RSS_TYPE_L4.

Signed-off-by: Larysa Zaremba <larysa.zaremba@intel.com>
---
.../selftests/bpf/prog_tests/xdp_metadata.c | 167 +++++++-----------
1 file changed, 59 insertions(+), 108 deletions(-)

diff --git a/tools/testing/selftests/bpf/prog_tests/xdp_metadata.c b/tools/testing/selftests/bpf/prog_tests/xdp_metadata.c
index 626c461fa34d..1877e5c6d6c7 100644
--- a/tools/testing/selftests/bpf/prog_tests/xdp_metadata.c
+++ b/tools/testing/selftests/bpf/prog_tests/xdp_metadata.c
@@ -20,7 +20,7 @@

#define UDP_PAYLOAD_BYTES 4

-#define AF_XDP_SOURCE_PORT 1234
+#define UDP_SOURCE_PORT 1234
#define AF_XDP_CONSUMER_PORT 8080

#define UMEM_NUM 16
@@ -33,6 +33,12 @@
#define RX_ADDR "10.0.0.2"
#define PREFIX_LEN "8"
#define FAMILY AF_INET
+#define TX_NETNS_NAME "xdp_metadata_tx"
+#define RX_NETNS_NAME "xdp_metadata_rx"
+#define TX_MAC "00:00:00:00:00:01"
+#define RX_MAC "00:00:00:00:00:02"
+
+#define XDP_RSS_TYPE_L4 BIT(3)

struct xsk {
void *umem_area;
@@ -119,90 +125,28 @@ static void close_xsk(struct xsk *xsk)
munmap(xsk->umem_area, UMEM_SIZE);
}

-static void ip_csum(struct iphdr *iph)
+static int generate_packet_udp(void)
{
- __u32 sum = 0;
- __u16 *p;
- int i;
-
- iph->check = 0;
- p = (void *)iph;
- for (i = 0; i < sizeof(*iph) / sizeof(*p); i++)
- sum += p[i];
-
- while (sum >> 16)
- sum = (sum & 0xffff) + (sum >> 16);
-
- iph->check = ~sum;
-}
-
-static int generate_packet(struct xsk *xsk, __u16 dst_port)
-{
- struct xdp_desc *tx_desc;
- struct udphdr *udph;
- struct ethhdr *eth;
- struct iphdr *iph;
- void *data;
- __u32 idx;
- int ret;
-
- ret = xsk_ring_prod__reserve(&xsk->tx, 1, &idx);
- if (!ASSERT_EQ(ret, 1, "xsk_ring_prod__reserve"))
- return -1;
-
- tx_desc = xsk_ring_prod__tx_desc(&xsk->tx, idx);
- tx_desc->addr = idx % (UMEM_NUM / 2) * UMEM_FRAME_SIZE;
- printf("%p: tx_desc[%u]->addr=%llx\n", xsk, idx, tx_desc->addr);
- data = xsk_umem__get_data(xsk->umem_area, tx_desc->addr);
-
- eth = data;
- iph = (void *)(eth + 1);
- udph = (void *)(iph + 1);
-
- memcpy(eth->h_dest, "\x00\x00\x00\x00\x00\x02", ETH_ALEN);
- memcpy(eth->h_source, "\x00\x00\x00\x00\x00\x01", ETH_ALEN);
- eth->h_proto = htons(ETH_P_IP);
-
- iph->version = 0x4;
- iph->ihl = 0x5;
- iph->tos = 0x9;
- iph->tot_len = htons(sizeof(*iph) + sizeof(*udph) + UDP_PAYLOAD_BYTES);
- iph->id = 0;
- iph->frag_off = 0;
- iph->ttl = 0;
- iph->protocol = IPPROTO_UDP;
- ASSERT_EQ(inet_pton(FAMILY, TX_ADDR, &iph->saddr), 1, "inet_pton(TX_ADDR)");
- ASSERT_EQ(inet_pton(FAMILY, RX_ADDR, &iph->daddr), 1, "inet_pton(RX_ADDR)");
- ip_csum(iph);
-
- udph->source = htons(AF_XDP_SOURCE_PORT);
- udph->dest = htons(dst_port);
- udph->len = htons(sizeof(*udph) + UDP_PAYLOAD_BYTES);
- udph->check = 0;
-
- memset(udph + 1, 0xAA, UDP_PAYLOAD_BYTES);
-
- tx_desc->len = sizeof(*eth) + sizeof(*iph) + sizeof(*udph) + UDP_PAYLOAD_BYTES;
- xsk_ring_prod__submit(&xsk->tx, 1);
-
- ret = sendto(xsk_socket__fd(xsk->socket), NULL, 0, MSG_DONTWAIT, NULL, 0);
- if (!ASSERT_GE(ret, 0, "sendto"))
- return ret;
-
- return 0;
-}
-
-static void complete_tx(struct xsk *xsk)
-{
- __u32 idx;
- __u64 addr;
-
- if (ASSERT_EQ(xsk_ring_cons__peek(&xsk->comp, 1, &idx), 1, "xsk_ring_cons__peek")) {
- addr = *xsk_ring_cons__comp_addr(&xsk->comp, idx);
-
- printf("%p: complete tx idx=%u addr=%llx\n", xsk, idx, addr);
- xsk_ring_cons__release(&xsk->comp, 1);
- }
+ char udp_payload[UDP_PAYLOAD_BYTES];
+ struct sockaddr_in rx_addr;
+ int sock_fd, err = 0;
+
+ /* Build a packet */
+ memset(udp_payload, 0xAA, UDP_PAYLOAD_BYTES);
+ rx_addr.sin_addr.s_addr = inet_addr(RX_ADDR);
+ rx_addr.sin_family = AF_INET;
+ rx_addr.sin_port = htons(UDP_SOURCE_PORT);
+
+ sock_fd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
+ if (!ASSERT_GE(sock_fd, 0, "socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP)"))
+ return sock_fd;
+
+ err = sendto(sock_fd, udp_payload, UDP_PAYLOAD_BYTES, MSG_DONTWAIT,
+ (void *)&rx_addr, sizeof(rx_addr));
+ ASSERT_GE(err, 0, "sendto");
+
+ close(sock_fd);
+ return err;
}

static void refill_rx(struct xsk *xsk, __u64 addr)
@@ -268,7 +212,8 @@ static int verify_xsk_metadata(struct xsk *xsk)
if (!ASSERT_NEQ(meta->rx_hash, 0, "rx_hash"))
return -1;

- ASSERT_EQ(meta->rx_hash_type, 0, "rx_hash_type");
+ if (!ASSERT_NEQ(meta->rx_hash_type & XDP_RSS_TYPE_L4, 0, "rx_hash_type"))
+ return -1;

xsk_ring_cons__release(&xsk->rx, 1);
refill_rx(xsk, comp_addr);
@@ -284,36 +229,38 @@ void test_xdp_metadata(void)
struct nstoken *tok = NULL;
__u32 queue_id = QUEUE_ID;
struct bpf_map *prog_arr;
- struct xsk tx_xsk = {};
struct xsk rx_xsk = {};
__u32 val, key = 0;
int retries = 10;
int rx_ifindex;
- int tx_ifindex;
int sock_fd;
int ret;

- /* Setup new networking namespace, with a veth pair. */
+ /* Setup new networking namespaces, with a veth pair. */

- SYS(out, "ip netns add xdp_metadata");
- tok = open_netns("xdp_metadata");
+ SYS(out, "ip netns add " TX_NETNS_NAME);
+ SYS(out, "ip netns add " RX_NETNS_NAME);
+
+ tok = open_netns(TX_NETNS_NAME);
SYS(out, "ip link add numtxqueues 1 numrxqueues 1 " TX_NAME
" type veth peer " RX_NAME " numtxqueues 1 numrxqueues 1");
- SYS(out, "ip link set dev " TX_NAME " address 00:00:00:00:00:01");
- SYS(out, "ip link set dev " RX_NAME " address 00:00:00:00:00:02");
+ SYS(out, "ip link set " RX_NAME " netns " RX_NETNS_NAME);
+
+ SYS(out, "ip link set dev " TX_NAME " address " TX_MAC);
SYS(out, "ip link set dev " TX_NAME " up");
- SYS(out, "ip link set dev " RX_NAME " up");
SYS(out, "ip addr add " TX_ADDR "/" PREFIX_LEN " dev " TX_NAME);
- SYS(out, "ip addr add " RX_ADDR "/" PREFIX_LEN " dev " RX_NAME);

- rx_ifindex = if_nametoindex(RX_NAME);
- tx_ifindex = if_nametoindex(TX_NAME);
+ /* Avoid ARP calls */
+ SYS(out, "ip -4 neigh add " RX_ADDR " lladdr " RX_MAC " dev " TX_NAME);
+ close_netns(tok);

- /* Setup separate AF_XDP for TX and RX interfaces. */
+ tok = open_netns(RX_NETNS_NAME);
+ SYS(out, "ip link set dev " RX_NAME " address " RX_MAC);
+ SYS(out, "ip link set dev " RX_NAME " up");
+ SYS(out, "ip addr add " RX_ADDR "/" PREFIX_LEN " dev " RX_NAME);
+ rx_ifindex = if_nametoindex(RX_NAME);

- ret = open_xsk(tx_ifindex, &tx_xsk);
- if (!ASSERT_OK(ret, "open_xsk(TX_NAME)"))
- goto out;
+ /* Setup AF_XDP for RX interface. */

ret = open_xsk(rx_ifindex, &rx_xsk);
if (!ASSERT_OK(ret, "open_xsk(RX_NAME)"))
@@ -353,19 +300,20 @@ void test_xdp_metadata(void)
ret = bpf_map_update_elem(bpf_map__fd(bpf_obj->maps.xsk), &queue_id, &sock_fd, 0);
if (!ASSERT_GE(ret, 0, "bpf_map_update_elem"))
goto out;
+ close_netns(tok);

/* Send packet destined to RX AF_XDP socket. */
- if (!ASSERT_GE(generate_packet(&tx_xsk, AF_XDP_CONSUMER_PORT), 0,
- "generate AF_XDP_CONSUMER_PORT"))
+ tok = open_netns(TX_NETNS_NAME);
+ if (!ASSERT_GE(generate_packet_udp(), 0, "generate UDP packet"))
goto out;
+ close_netns(tok);

/* Verify AF_XDP RX packet has proper metadata. */
+ tok = open_netns(RX_NETNS_NAME);
if (!ASSERT_GE(verify_xsk_metadata(&rx_xsk), 0,
"verify_xsk_metadata"))
goto out;

- complete_tx(&tx_xsk);
-
/* Make sure freplace correctly picks up original bound device
* and doesn't crash.
*/
@@ -382,12 +330,15 @@ void test_xdp_metadata(void)

if (!ASSERT_OK(xdp_metadata2__attach(bpf_obj2), "attach freplace"))
goto out;
+ close_netns(tok);

/* Send packet to trigger . */
- if (!ASSERT_GE(generate_packet(&tx_xsk, AF_XDP_CONSUMER_PORT), 0,
- "generate freplace packet"))
+ tok = open_netns(TX_NETNS_NAME);
+ if (!ASSERT_GE(generate_packet_udp(), 0, "generate freplace packet"))
goto out;
+ close_netns(tok);

+ tok = open_netns(RX_NETNS_NAME);
while (!retries--) {
if (bpf_obj2->bss->called)
break;
@@ -397,10 +348,10 @@ void test_xdp_metadata(void)

out:
close_xsk(&rx_xsk);
- close_xsk(&tx_xsk);
xdp_metadata2__destroy(bpf_obj2);
xdp_metadata__destroy(bpf_obj);
if (tok)
close_netns(tok);
- SYS_NOFAIL("ip netns del xdp_metadata");
+ SYS_NOFAIL("ip netns del " RX_NETNS_NAME);
+ SYS_NOFAIL("ip netns del " TX_NETNS_NAME);
}
--
2.41.0