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Date: Thu, 19 Aug 2021 12:10:57 +0200
From: Maciej Fijalkowski <maciej.fijalkowski@...el.com>
To: Magnus Karlsson <magnus.karlsson@...il.com>
Cc: magnus.karlsson@...el.com, bjorn@...nel.org, ast@...nel.org,
daniel@...earbox.net, netdev@...r.kernel.org,
jonathan.lemon@...il.com, ciara.loftus@...el.com,
bpf@...r.kernel.org, yhs@...com, andrii@...nel.org
Subject: Re: [PATCH bpf-next v2 14/16] selftests: xsk: generate packets from
specification
On Tue, Aug 17, 2021 at 11:27:27AM +0200, Magnus Karlsson wrote:
> From: Magnus Karlsson <magnus.karlsson@...el.com>
>
> Generate packets from a specification instead of something hard
> coded. The idea is that a test generates one or more packet
> specifications and provides it/them to both Tx and Rx. The Tx thread
> will generate from this specification and Rx will validate that it
> receives what is in the specification. The specification can be the
> same on both ends, meaning that everything that was sent should be
> received, or different which means that Rx will only receive part of
> the sent packets.
>
> Currently, the packet specification is the same for both Rx and Tx and
> the same for each test. This will change in later patches as features
> and tests are added.
You probably meant 'later work' by itself, by saying 'later patches' I
would expect it to be in this same set. But that's not a big deal to me.
>
> The data path functions are also renamed to better reflect what
> actions they are performing after introducing this feature.
>
> Signed-off-by: Magnus Karlsson <magnus.karlsson@...el.com>
> ---
> tools/testing/selftests/bpf/xdpxceiver.c | 254 +++++++++++++----------
> tools/testing/selftests/bpf/xdpxceiver.h | 15 +-
> 2 files changed, 152 insertions(+), 117 deletions(-)
>
> diff --git a/tools/testing/selftests/bpf/xdpxceiver.c b/tools/testing/selftests/bpf/xdpxceiver.c
> index a62e5ebb0f2c..4160ba5f50a3 100644
> --- a/tools/testing/selftests/bpf/xdpxceiver.c
> +++ b/tools/testing/selftests/bpf/xdpxceiver.c
> @@ -417,18 +417,52 @@ static void parse_command_line(int argc, char **argv)
> }
> }
>
> -static void pkt_generate(struct ifobject *ifobject, u32 pkt_nb, u64 addr)
> +static struct pkt *pkt_stream_get_pkt(struct pkt_stream *pkt_stream, u32 pkt_nb)
> {
> - void *data = xsk_umem__get_data(ifobject->umem->buffer, addr);
> + return &pkt_stream->pkts[pkt_nb];
> +}
> +
> +static struct pkt_stream *pkt_stream_generate(u32 nb_pkts, u32 pkt_len)
> +{
> + struct pkt_stream *pkt_stream;
> + u32 i;
> +
> + pkt_stream = malloc(sizeof(*pkt_stream));
> + if (!pkt_stream)
> + exit_with_error(ENOMEM);
> +
> + pkt_stream->pkts = calloc(DEFAULT_PKT_CNT, sizeof(*pkt_stream->pkts));
Why not nb_pkts as a first arg?
> + if (!pkt_stream->pkts)
> + exit_with_error(ENOMEM);
> +
> + pkt_stream->nb_pkts = nb_pkts;
> + for (i = 0; i < nb_pkts; i++) {
> + pkt_stream->pkts[i].addr = (i % num_frames) * XSK_UMEM__DEFAULT_FRAME_SIZE;
> + pkt_stream->pkts[i].len = pkt_len;
> + pkt_stream->pkts[i].payload = i;
> + }
> +
> + return pkt_stream;
> +}
> +
> +static struct pkt *pkt_generate(struct ifobject *ifobject, u32 pkt_nb)
> +{
> + struct pkt *pkt = pkt_stream_get_pkt(ifobject->pkt_stream, pkt_nb);
> + void *data = xsk_umem__get_data(ifobject->umem->buffer, pkt->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;
>
> + if (pkt_nb >= ifobject->pkt_stream->nb_pkts)
> + return NULL;
shouldn't this check be within pkt_stream_get_pkt ?
> +
> 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);
> +
> + return pkt;
> }
>
> static void pkt_dump(void *pkt, u32 len)
> @@ -468,33 +502,38 @@ static void pkt_dump(void *pkt, u32 len)
> fprintf(stdout, "---------------------------------------\n");
> }
>
> -static void pkt_validate(void *buffer, u64 addr)
> +static bool pkt_validate(struct pkt *pkt, void *buffer, const struct xdp_desc *desc)
Now maybe a better name (because of bool) would be is_pkt_valid ?
> {
> - void *data = xsk_umem__get_data(buffer, addr);
> + void *data = xsk_umem__get_data(buffer, desc->addr);
> struct iphdr *iphdr = (struct iphdr *)(data + sizeof(struct ethhdr));
>
> if (iphdr->version == IP_PKT_VER && iphdr->tos == IP_PKT_TOS) {
> 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(data, PKT_SIZE);
>
> - if (expected_seqnum != seqnum) {
> + if (pkt->len != desc->len) {
> ksft_test_result_fail
> - ("ERROR: [%s] expected seqnum [%d], got seqnum [%d]\n",
> - __func__, expected_seqnum, seqnum);
> - sigvar = 1;
> + ("ERROR: [%s] expected length [%d], got length [%d]\n",
> + __func__, pkt->len, desc->len);
> + return false;
> }
>
> - if (++pkt_counter == opt_pkt_count)
> - sigvar = 1;
> + if (pkt->payload != seqnum) {
> + ksft_test_result_fail
> + ("ERROR: [%s] expected seqnum [%d], got seqnum [%d]\n",
> + __func__, pkt->payload, seqnum);
> + return false;
> + }
> } else {
> ksft_print_msg("Invalid frame received: ");
> ksft_print_msg("[IP_PKT_VER: %02X], [IP_PKT_TOS: %02X]\n", iphdr->version,
> iphdr->tos);
> - sigvar = 1;
> + return false;
> }
> +
> + return true;
> }
>
> static void kick_tx(struct xsk_socket_info *xsk)
> @@ -507,7 +546,7 @@ static void kick_tx(struct xsk_socket_info *xsk)
> exit_with_error(errno);
> }
>
> -static void complete_tx_only(struct xsk_socket_info *xsk, int batch_size)
> +static void complete_pkts(struct xsk_socket_info *xsk, int batch_size)
> {
> unsigned int rcvd;
> u32 idx;
> @@ -525,116 +564,106 @@ static void complete_tx_only(struct xsk_socket_info *xsk, int batch_size)
> }
> }
>
> -static void rx_pkt(struct xsk_socket_info *xsk, struct pollfd *fds)
> +static void receive_pkts(struct pkt_stream *pkt_stream, struct xsk_socket_info *xsk,
> + struct pollfd *fds)
> {
> - unsigned int rcvd, i;
> - u32 idx_rx = 0, idx_fq = 0;
> + u32 idx_rx = 0, idx_fq = 0, rcvd, i, pkt_count = 0;
> int ret;
>
> - rcvd = xsk_ring_cons__peek(&xsk->rx, BATCH_SIZE, &idx_rx);
> - if (!rcvd) {
> - if (xsk_ring_prod__needs_wakeup(&xsk->umem->fq)) {
> - ret = poll(fds, 1, POLL_TMOUT);
> - if (ret < 0)
> - exit_with_error(-ret);
> + while (1) {
> + rcvd = xsk_ring_cons__peek(&xsk->rx, BATCH_SIZE, &idx_rx);
> + if (!rcvd) {
> + if (xsk_ring_prod__needs_wakeup(&xsk->umem->fq)) {
> + ret = poll(fds, 1, POLL_TMOUT);
> + if (ret < 0)
> + exit_with_error(-ret);
> + }
> + continue;
> }
> - return;
> - }
>
> - ret = xsk_ring_prod__reserve(&xsk->umem->fq, rcvd, &idx_fq);
> - while (ret != rcvd) {
> - if (ret < 0)
> - exit_with_error(-ret);
> - if (xsk_ring_prod__needs_wakeup(&xsk->umem->fq)) {
> - ret = poll(fds, 1, POLL_TMOUT);
> + ret = xsk_ring_prod__reserve(&xsk->umem->fq, rcvd, &idx_fq);
> + while (ret != rcvd) {
> if (ret < 0)
> exit_with_error(-ret);
> + if (xsk_ring_prod__needs_wakeup(&xsk->umem->fq)) {
> + ret = poll(fds, 1, POLL_TMOUT);
> + if (ret < 0)
> + exit_with_error(-ret);
> + }
> + ret = xsk_ring_prod__reserve(&xsk->umem->fq, rcvd, &idx_fq);
> }
> - ret = xsk_ring_prod__reserve(&xsk->umem->fq, rcvd, &idx_fq);
> - }
>
> - for (i = 0; i < rcvd; i++) {
> - u64 addr, orig;
> + for (i = 0; i < rcvd; i++) {
> + const struct xdp_desc *desc = xsk_ring_cons__rx_desc(&xsk->rx, idx_rx++);
> + u64 addr = desc->addr, orig;
> +
> + orig = xsk_umem__extract_addr(addr);
> + addr = xsk_umem__add_offset_to_addr(addr);
> + if (!pkt_validate(pkt_stream_get_pkt(pkt_stream, pkt_count++),
> + xsk->umem->buffer, desc))
> + return;
>
> - addr = xsk_ring_cons__rx_desc(&xsk->rx, idx_rx)->addr;
> - xsk_ring_cons__rx_desc(&xsk->rx, idx_rx++);
> - orig = xsk_umem__extract_addr(addr);
> + *xsk_ring_prod__fill_addr(&xsk->umem->fq, idx_fq++) = orig;
> + }
>
> - addr = xsk_umem__add_offset_to_addr(addr);
> - pkt_validate(xsk->umem->buffer, addr);
> + xsk_ring_prod__submit(&xsk->umem->fq, rcvd);
> + xsk_ring_cons__release(&xsk->rx, rcvd);
>
> - *xsk_ring_prod__fill_addr(&xsk->umem->fq, idx_fq++) = orig;
> + if (pkt_count >= pkt_stream->nb_pkts)
> + return;
> }
> -
> - xsk_ring_prod__submit(&xsk->umem->fq, rcvd);
> - xsk_ring_cons__release(&xsk->rx, rcvd);
> }
>
> -static void tx_only(struct ifobject *ifobject, u32 *frameptr, int batch_size)
> +static u32 __send_pkts(struct ifobject *ifobject, u32 pkt_nb)
> {
> struct xsk_socket_info *xsk = ifobject->xsk;
> - u32 idx = 0;
> - unsigned int i;
> - bool tx_invalid_test = stat_test_type == STAT_TEST_TX_INVALID;
> - u32 len = tx_invalid_test ? XSK_UMEM__DEFAULT_FRAME_SIZE + 1 : PKT_SIZE;
> + u32 i, idx;
>
> - while (xsk_ring_prod__reserve(&xsk->tx, batch_size, &idx) < batch_size)
> - complete_tx_only(xsk, batch_size);
> + while (xsk_ring_prod__reserve(&xsk->tx, BATCH_SIZE, &idx) < BATCH_SIZE)
> + complete_pkts(xsk, BATCH_SIZE);
>
> - for (i = 0; i < batch_size; i++) {
> + for (i = 0; i < BATCH_SIZE; i++) {
> struct xdp_desc *tx_desc = xsk_ring_prod__tx_desc(&xsk->tx, idx + i);
> + struct pkt *pkt = pkt_generate(ifobject, pkt_nb);
>
> - tx_desc->addr = (*frameptr + i) << XSK_UMEM__DEFAULT_FRAME_SHIFT;
> - tx_desc->len = len;
> - pkt_generate(ifobject, *frameptr + i, tx_desc->addr);
> - }
> + if (!pkt)
> + break;
>
> - xsk_ring_prod__submit(&xsk->tx, batch_size);
> - if (!tx_invalid_test) {
> - xsk->outstanding_tx += batch_size;
> - } else if (xsk_ring_prod__needs_wakeup(&xsk->tx)) {
> - kick_tx(xsk);
> + tx_desc->addr = pkt->addr;
> + tx_desc->len = pkt->len;
> + pkt_nb++;
> }
> - *frameptr += batch_size;
> - *frameptr %= num_frames;
> - complete_tx_only(xsk, batch_size);
> -}
>
> -static int get_batch_size(int pkt_cnt)
> -{
> - if (pkt_cnt + BATCH_SIZE <= opt_pkt_count)
> - return BATCH_SIZE;
> + xsk_ring_prod__submit(&xsk->tx, i);
> + if (stat_test_type != STAT_TEST_TX_INVALID)
> + xsk->outstanding_tx += i;
> + else if (xsk_ring_prod__needs_wakeup(&xsk->tx))
> + kick_tx(xsk);
> + complete_pkts(xsk, i);
>
> - return opt_pkt_count - pkt_cnt;
> + return i;
> }
>
> -static void complete_tx_only_all(struct ifobject *ifobject)
> +static void wait_for_tx_completion(struct xsk_socket_info *xsk)
> {
> - bool pending;
> -
> - do {
> - pending = false;
> - if (ifobject->xsk->outstanding_tx) {
> - complete_tx_only(ifobject->xsk, BATCH_SIZE);
> - pending = !!ifobject->xsk->outstanding_tx;
> - }
> - } while (pending);
> + while (xsk->outstanding_tx)
> + complete_pkts(xsk, BATCH_SIZE);
> }
>
> -static void tx_only_all(struct ifobject *ifobject)
> +static void send_pkts(struct ifobject *ifobject)
> {
> struct pollfd fds[MAX_SOCKS] = { };
> - u32 frame_nb = 0;
> - int pkt_cnt = 0;
> - int ret;
> + u32 pkt_cnt = 0;
>
> fds[0].fd = xsk_socket__fd(ifobject->xsk->xsk);
> fds[0].events = POLLOUT;
>
> - while (pkt_cnt < opt_pkt_count) {
> - int batch_size = get_batch_size(pkt_cnt);
> + while (pkt_cnt < ifobject->pkt_stream->nb_pkts) {
> + u32 sent;
>
> if (test_type == TEST_TYPE_POLL) {
> + int ret;
> +
> ret = poll(fds, 1, POLL_TMOUT);
> if (ret <= 0)
> continue;
> @@ -643,16 +672,16 @@ static void tx_only_all(struct ifobject *ifobject)
> continue;
> }
>
> - tx_only(ifobject, &frame_nb, batch_size);
> - pkt_cnt += batch_size;
> + sent = __send_pkts(ifobject, pkt_cnt);
> + pkt_cnt += sent;
> }
>
> - complete_tx_only_all(ifobject);
> + wait_for_tx_completion(ifobject->xsk);
> }
>
> static bool rx_stats_are_valid(struct ifobject *ifobject)
> {
> - u32 xsk_stat = 0, expected_stat = opt_pkt_count;
> + u32 xsk_stat = 0, expected_stat = ifobject->pkt_stream->nb_pkts;
> struct xsk_socket *xsk = ifobject->xsk->xsk;
> int fd = xsk_socket__fd(xsk);
> struct xdp_statistics stats;
> @@ -708,11 +737,11 @@ static void tx_stats_validate(struct ifobject *ifobject)
> return;
> }
>
> - if (stats.tx_invalid_descs == opt_pkt_count)
> + if (stats.tx_invalid_descs == ifobject->pkt_stream->nb_pkts)
> return;
>
> ksft_test_result_fail("ERROR: [%s] tx_invalid_descs incorrect. Got [%u] expected [%u]\n",
> - __func__, stats.tx_invalid_descs, opt_pkt_count);
> + __func__, stats.tx_invalid_descs, ifobject->pkt_stream->nb_pkts);
> }
>
> static void thread_common_ops(struct ifobject *ifobject, void *bufs)
> @@ -781,8 +810,9 @@ static void *worker_testapp_validate_tx(void *arg)
> if (!second_step)
> thread_common_ops(ifobject, bufs);
>
> - print_verbose("Sending %d packets on interface %s\n", opt_pkt_count, ifobject->ifname);
> - tx_only_all(ifobject);
> + print_verbose("Sending %d packets on interface %s\n", ifobject->pkt_stream->nb_pkts,
> + ifobject->ifname);
> + send_pkts(ifobject);
>
> if (stat_test_type == STAT_TEST_TX_INVALID)
> tx_stats_validate(ifobject);
> @@ -808,19 +838,11 @@ static void *worker_testapp_validate_rx(void *arg)
>
> pthread_barrier_wait(&barr);
>
> - while (1) {
> - if (test_type != TEST_TYPE_STATS) {
> - rx_pkt(ifobject->xsk, fds);
> - } else {
> - if (rx_stats_are_valid(ifobject))
> - break;
> - }
> - if (sigvar)
> - break;
> - }
> -
> - print_verbose("Received %d packets on interface %s\n",
> - pkt_counter, ifobject->ifname);
> + if (test_type == TEST_TYPE_STATS)
> + while (!rx_stats_are_valid(ifobject))
> + continue;
> + else
> + receive_pkts(ifobject->pkt_stream, ifobject->xsk, fds);
>
> if (test_type == TEST_TYPE_TEARDOWN)
> print_verbose("Destroying socket\n");
> @@ -833,10 +855,20 @@ static void testapp_validate(void)
> {
> bool bidi = test_type == TEST_TYPE_BIDI;
> bool bpf = test_type == TEST_TYPE_BPF_RES;
> + struct pkt_stream *pkt_stream;
>
> if (pthread_barrier_init(&barr, NULL, 2))
> exit_with_error(errno);
>
> + if (stat_test_type == STAT_TEST_TX_INVALID) {
> + pkt_stream = pkt_stream_generate(DEFAULT_PKT_CNT,
> + XSK_UMEM__DEFAULT_FRAME_SIZE + 1);
nit: maybe add:
#define XSK_UMEM__INVALID_FRAME_SIZE (XSK_UMEM__DEFAULT_FRAME_SIZE + 1)
and use it above. Again, not a big deal.
Also wondering if we imagine having a different frame size in umem than
4k? Then it would make sense to pass it as a size. Currently
pkt_stream_generate has hard coded XSK_UMEM__DEFAULT_FRAME_SIZE.
> + } else {
> + pkt_stream = pkt_stream_generate(DEFAULT_PKT_CNT, PKT_SIZE);
> + }
> + ifdict_tx->pkt_stream = pkt_stream;
> + ifdict_rx->pkt_stream = pkt_stream;
> +
> /*Spawn RX thread */
> pthread_create(&t0, NULL, ifdict_rx->func_ptr, ifdict_rx);
>
> @@ -859,8 +891,6 @@ static void testapp_teardown(void)
> int i;
>
> for (i = 0; i < MAX_TEARDOWN_ITER; i++) {
> - pkt_counter = 0;
> - sigvar = 0;
> print_verbose("Creating socket\n");
> testapp_validate();
> }
> @@ -886,8 +916,6 @@ static void swap_vectors(struct ifobject *ifobj1, struct ifobject *ifobj2)
> static void testapp_bidi(void)
> {
> for (int i = 0; i < MAX_BIDI_ITER; i++) {
> - pkt_counter = 0;
> - sigvar = 0;
> print_verbose("Creating socket\n");
> testapp_validate();
> if (!second_step) {
> @@ -919,8 +947,6 @@ static void testapp_bpf_res(void)
> int i;
>
> for (i = 0; i < MAX_BPF_ITER; i++) {
> - pkt_counter = 0;
> - sigvar = 0;
> print_verbose("Creating socket\n");
> testapp_validate();
> if (!second_step)
> @@ -948,6 +974,8 @@ static void testapp_stats(void)
> case STAT_TEST_RX_FULL:
> rxqsize = RX_FULL_RXQSIZE;
> break;
> + case STAT_TEST_TX_INVALID:
> + continue;
> default:
> break;
> }
> @@ -993,9 +1021,7 @@ static void run_pkt_test(int mode, int type)
>
> /* reset defaults after potential previous test */
> xdp_flags = XDP_FLAGS_UPDATE_IF_NOEXIST;
> - pkt_counter = 0;
> second_step = 0;
> - sigvar = 0;
> stat_test_type = -1;
> rxqsize = XSK_RING_CONS__DEFAULT_NUM_DESCS;
> frame_headroom = XSK_UMEM__DEFAULT_FRAME_HEADROOM;
> diff --git a/tools/testing/selftests/bpf/xdpxceiver.h b/tools/testing/selftests/bpf/xdpxceiver.h
> index b3087270d837..f5b46cd3d8df 100644
> --- a/tools/testing/selftests/bpf/xdpxceiver.h
> +++ b/tools/testing/selftests/bpf/xdpxceiver.h
> @@ -74,13 +74,10 @@ static u32 num_frames = DEFAULT_PKT_CNT / 4;
> static bool second_step;
> static int test_type;
>
> -static u32 opt_pkt_count = DEFAULT_PKT_CNT;
> 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 u32 pkt_counter;
> -static int sigvar;
> static int stat_test_type;
> static u32 rxqsize;
> static u32 frame_headroom;
> @@ -107,6 +104,17 @@ struct flow_vector {
> } vector;
> };
>
> +struct pkt {
> + u64 addr;
> + u32 len;
> + u32 payload;
> +};
> +
> +struct pkt_stream {
> + u32 nb_pkts;
> + struct pkt *pkts;
> +};
> +
> struct ifobject {
> char ifname[MAX_INTERFACE_NAME_CHARS];
> char nsname[MAX_INTERFACES_NAMESPACE_CHARS];
> @@ -116,6 +124,7 @@ struct ifobject {
> struct xsk_umem_info *umem;
> void *(*func_ptr)(void *arg);
> struct flow_vector fv;
> + struct pkt_stream *pkt_stream;
> int ns_fd;
> int ifdict_index;
> u32 dst_ip;
> --
> 2.29.0
>
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