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selftests: xsk: Generate packet directly in umem

Browse source 
Generate the packet directly in the umem instead of in a temporary
buffer that is copied out. Simplifies the code and improves
performance.

Signed-off-by: Magnus Karlsson <magnus.karlsson@intel.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20210825093722.10219-14-magnus.karlsson@gmail.com
This commit is contained in:
Magnus Karlsson 2021-08-25 11:37:19 +02:00 committed by Alexei Starovoitov
parent 1034b03e54
commit 960b6e0153
2 changed files with 32 additions and 43 deletions
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70
tools/testing/selftests/bpf/xdpxceiver.c
View file

@ -125,7 +125,7 @@ static void __exit_with_error(int error, const char *file, const char *func, int
test_type == TEST_TYPE_STATS ? "Stats" : "",\
test_type == TEST_TYPE_BPF_RES ? "BPF RES" : ""))
static void *memset32_htonl(void *dest, u32 val, u32 size)
static void memset32_htonl(void *dest, u32 val, u32 size)
{
u32 *ptr = (u32 *)dest;
int i;
@ -134,11 +134,6 @@ static void *memset32_htonl(void *dest, u32 val, u32 size)
for (i = 0; i < (size & (~0x3)); i += 4)
ptr[i >> 2] = val;
for (; i < size; i++)
((char *)dest)[i] = ((char *)&val)[i & 3];
return dest;
}
/*
@ -229,13 +224,13 @@ static void gen_ip_hdr(struct ifobject *ifobject, struct iphdr *ip_hdr)
ip_hdr->check = 0;
}
static void gen_udp_hdr(struct generic_data *data, struct ifobject *ifobject,
static void gen_udp_hdr(u32 payload, void *pkt, struct ifobject *ifobject,
struct udphdr *udp_hdr)
{
udp_hdr->source = htons(ifobject->src_port);
udp_hdr->dest = htons(ifobject->dst_port);
udp_hdr->len = htons(UDP_PKT_SIZE);
memset32_htonl(pkt_data + PKT_HDR_SIZE, htonl(data->seqnum), UDP_PKT_DATA_SIZE);
memset32_htonl(pkt + PKT_HDR_SIZE, payload, UDP_PKT_DATA_SIZE);
}
static void gen_udp_csum(struct udphdr *udp_hdr, struct iphdr *ip_hdr)
@ -245,11 +240,6 @@ static void gen_udp_csum(struct udphdr *udp_hdr, struct iphdr *ip_hdr)
udp_csum(ip_hdr->saddr, ip_hdr->daddr, UDP_PKT_SIZE, IPPROTO_UDP, (u16 *)udp_hdr);
}
static void gen_eth_frame(struct xsk_umem_info *umem, u64 addr)
{
memcpy(xsk_umem__get_data(umem->buffer, addr), pkt_data, PKT_SIZE);
}
static void xsk_configure_umem(struct ifobject *data, void *buffer, u64 size, int idx)
{
struct xsk_umem_config cfg = {
@ -427,6 +417,20 @@ static void parse_command_line(int argc, char **argv)
}
}
static void pkt_generate(struct ifobject *ifobject, u32 pkt_nb, u64 addr)
{
void *data = xsk_umem__get_data(ifobject->umem->buffer, addr);
struct udphdr *udp_hdr =
(struct udphdr *)(data + sizeof(struct ethhdr) + sizeof(struct iphdr));
struct iphdr *ip_hdr = (struct iphdr *)(data + sizeof(struct ethhdr));
struct ethhdr *eth_hdr = (struct ethhdr *)data;
gen_udp_hdr(pkt_nb, data, ifobject, udp_hdr);
gen_ip_hdr(ifobject, ip_hdr);
gen_udp_csum(udp_hdr, ip_hdr);
gen_eth_hdr(ifobject, eth_hdr);
}
static void pkt_dump(void *pkt, u32 len)
{
char s[INET_ADDRSTRLEN];
@ -464,22 +468,23 @@ static void pkt_dump(void *pkt, u32 len)
fprintf(stdout, "---------------------------------------\n");
}
static void pkt_validate(void *pkt)
static void pkt_validate(void *buffer, u64 addr)
{
struct iphdr *iphdr = (struct iphdr *)(pkt + sizeof(struct ethhdr));
void *data = xsk_umem__get_data(buffer, addr);
struct iphdr *iphdr = (struct iphdr *)(data + sizeof(struct ethhdr));
/*do not increment pktcounter if !(tos=0x9 and ipv4) */
if (iphdr->version == IP_PKT_VER && iphdr->tos == IP_PKT_TOS) {
u32 payloadseqnum = *((uint32_t *)(pkt + PKT_HDR_SIZE));
u32 seqnum = ntohl(*((u32 *)(data + PKT_HDR_SIZE)));
u32 expected_seqnum = pkt_counter % num_frames;
if (debug_pkt_dump && test_type != TEST_TYPE_STATS)
pkt_dump(pkt, PKT_SIZE);
pkt_dump(data, PKT_SIZE);
if (pkt_counter % num_frames != payloadseqnum) {
if (expected_seqnum != seqnum) {
ksft_test_result_fail
("ERROR: [%s] expected seqnum [%d], got seqnum [%d]\n",
__func__, pkt_counter, payloadseqnum);
ksft_exit_xfail();
__func__, expected_seqnum, seqnum);
sigvar = 1;
}
if (++pkt_counter == opt_pkt_count)
@ -488,6 +493,7 @@ static void pkt_validate(void *pkt)
ksft_print_msg("Invalid frame received: ");
ksft_print_msg("[IP_PKT_VER: %02X], [IP_PKT_TOS: %02X]\n", iphdr->version,
iphdr->tos);
sigvar = 1;
}
}
@ -555,7 +561,7 @@ static void rx_pkt(struct xsk_socket_info *xsk, struct pollfd *fds)
orig = xsk_umem__extract_addr(addr);
addr = xsk_umem__add_offset_to_addr(addr);
pkt_validate(xsk_umem__get_data(xsk->umem->buffer, addr));
pkt_validate(xsk->umem->buffer, addr);
*xsk_ring_prod__fill_addr(&xsk->umem->fq, idx_fq++) = orig;
}
@ -564,8 +570,9 @@ static void rx_pkt(struct xsk_socket_info *xsk, struct pollfd *fds)
xsk_ring_cons__release(&xsk->rx, rcvd);
}
static void tx_only(struct xsk_socket_info *xsk, u32 *frameptr, int batch_size)
static void tx_only(struct ifobject *ifobject, u32 *frameptr, int batch_size)
{
struct xsk_socket_info *xsk = ifobject->xsk;
u32 idx = 0;
unsigned int i;
bool tx_invalid_test = stat_test_type == STAT_TEST_TX_INVALID;
@ -579,6 +586,7 @@ static void tx_only(struct xsk_socket_info *xsk, u32 *frameptr, int batch_size)
tx_desc->addr = (*frameptr + i) << XSK_UMEM__DEFAULT_FRAME_SHIFT;
tx_desc->len = len;
pkt_generate(ifobject, *frameptr + i, tx_desc->addr);
}
xsk_ring_prod__submit(&xsk->tx, batch_size);
@ -635,7 +643,7 @@ static void tx_only_all(struct ifobject *ifobject)
continue;
}
tx_only(ifobject->xsk, &frame_nb, batch_size);
tx_only(ifobject, &frame_nb, batch_size);
pkt_cnt += batch_size;
usleep(10);
}
@ -768,26 +776,12 @@ static void testapp_cleanup_xsk_res(struct ifobject *ifobj)
static void *worker_testapp_validate_tx(void *arg)
{
struct udphdr *udp_hdr =
(struct udphdr *)(pkt_data + sizeof(struct ethhdr) + sizeof(struct iphdr));
struct iphdr *ip_hdr = (struct iphdr *)(pkt_data + sizeof(struct ethhdr));
struct ethhdr *eth_hdr = (struct ethhdr *)pkt_data;
struct ifobject *ifobject = (struct ifobject *)arg;
struct generic_data data;
void *bufs = NULL;
if (!second_step)
thread_common_ops(ifobject, bufs);
for (int i = 0; i < num_frames; i++) {
data.seqnum = i;
gen_udp_hdr(&data, ifobject, udp_hdr);
gen_ip_hdr(ifobject, ip_hdr);
gen_udp_csum(udp_hdr, ip_hdr);
gen_eth_hdr(ifobject, eth_hdr);
gen_eth_frame(ifobject->umem, i * XSK_UMEM__DEFAULT_FRAME_SIZE);
}
print_verbose("Sending %d packets on interface %s\n", opt_pkt_count, ifobject->ifname);
tx_only_all(ifobject);

5
tools/testing/selftests/bpf/xdpxceiver.h
View file

@ -79,7 +79,6 @@ static u8 opt_verbose;
static u32 xdp_flags = XDP_FLAGS_UPDATE_IF_NOEXIST;
static u32 xdp_bind_flags = XDP_USE_NEED_WAKEUP | XDP_COPY;
static u8 pkt_data[XSK_UMEM__DEFAULT_FRAME_SIZE];
static u32 pkt_counter;
static int sigvar;
static int stat_test_type;
@ -108,10 +107,6 @@ struct flow_vector {
} vector;
};
struct generic_data {
u32 seqnum;
};
struct ifobject {
char ifname[MAX_INTERFACE_NAME_CHARS];
char nsname[MAX_INTERFACES_NAMESPACE_CHARS];