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Date: Fri, 29 Jul 2022 16:55:28 +0200
From: Maciej Fijalkowski <maciej.fijalkowski@...el.com>
To: Shibin Koikkara Reeny <shibin.koikkara.reeny@...el.com>
CC: <bpf@...r.kernel.org>, <ast@...nel.org>, <daniel@...earbox.net>,
<netdev@...r.kernel.org>, <magnus.karlsson@...el.com>,
<bjorn@...nel.org>, <kuba@...nel.org>, <andrii@...nel.org>,
<ciara.loftus@...el.com>
Subject: Re: [PATCH bpf-next v3] selftests: xsk: Update poll test cases
On Fri, Jul 29, 2022 at 01:23:37PM +0000, Shibin Koikkara Reeny wrote:
> Poll test case was not testing all the functionality
> of the poll feature in the testsuite. This patch
> update the poll test case which contain 2 testcases to
> test the RX and the TX poll functionality and additional
> 2 more testcases to check the timeout features of the
> poll event.
>
> Poll testsuite have 4 test cases:
>
> 1. TEST_TYPE_RX_POLL:
> Check if RX path POLLIN function work as expect. TX path
> can use any method to sent the traffic.
>
> 2. TEST_TYPE_TX_POLL:
> Check if TX path POLLOUT function work as expect. RX path
> can use any method to receive the traffic.
>
> 3. TEST_TYPE_POLL_RXQ_EMPTY:
> Call poll function with parameter POLLIN on empty rx queue
> will cause timeout.If return timeout then test case is pass.
>
> 4. TEST_TYPE_POLL_TXQ_FULL:
> When txq is filled and packets are not cleaned by the kernel
> then if we invoke the poll function with POLLOUT then it
> should trigger timeout.
>
> v1: https://lore.kernel.org/bpf/20220718095712.588513-1-shibin.koikkara.reeny@intel.com/
> v2: https://lore.kernel.org/bpf/20220726101723.250746-1-shibin.koikkara.reeny@intel.com/
>
> Changes in v2:
> * Updated the commit message
> * fixed the while loop flow in receive_pkts function.
> Changes in v3:
> * Introduced single thread validation function.
> * Removed pkt_stream_invalid().
> * Updated TEST_TYPE_POLL_TXQ_FULL testcase to create invalid frame.
> * Removed timer from send_pkts().
Hmm, so timer is not needed for tx side? Is it okay to remove it
altogether? I only meant to pull it out to preceding patch.
> * Removed boolean variable skip_rx and skip_tx
>
> Signed-off-by: Shibin Koikkara Reeny <shibin.koikkara.reeny@...el.com>
> ---
> tools/testing/selftests/bpf/xskxceiver.c | 155 +++++++++++++++++------
> tools/testing/selftests/bpf/xskxceiver.h | 8 +-
> 2 files changed, 125 insertions(+), 38 deletions(-)
>
> diff --git a/tools/testing/selftests/bpf/xskxceiver.c b/tools/testing/selftests/bpf/xskxceiver.c
> index 74d56d971baf..32ba6464f29f 100644
> --- a/tools/testing/selftests/bpf/xskxceiver.c
> +++ b/tools/testing/selftests/bpf/xskxceiver.c
> @@ -817,9 +817,9 @@ static int complete_pkts(struct xsk_socket_info *xsk, int batch_size)
> return TEST_PASS;
> }
>
> -static int receive_pkts(struct ifobject *ifobj, struct pollfd *fds)
> +static int receive_pkts(struct test_spec *test, struct ifobject *ifobj, struct pollfd *fds)
Nit : I think that we could skip passing ifobj explicitly if we're passing
test_spec itself and just work on
struct ifobject *ifobj = test->ifobj_rx;
within the function.
> {
> - struct timeval tv_end, tv_now, tv_timeout = {RECV_TMOUT, 0};
> + struct timeval tv_end, tv_now, tv_timeout = {THREAD_TMOUT, 0};
> u32 idx_rx = 0, idx_fq = 0, rcvd, i, pkts_sent = 0;
> struct pkt_stream *pkt_stream = ifobj->pkt_stream;
> struct xsk_socket_info *xsk = ifobj->xsk;
> @@ -843,17 +843,28 @@ static int receive_pkts(struct ifobject *ifobj, struct pollfd *fds)
> }
>
> kick_rx(xsk);
> + if (ifobj->use_poll) {
> + ret = poll(fds, 1, POLL_TMOUT);
> + if (ret < 0)
> + exit_with_error(-ret);
> +
> + if (!ret) {
> + if (!test->ifobj_tx->umem->umem)
> + return TEST_PASS;
> +
> + ksft_print_msg("ERROR: [%s] Poll timed out\n", __func__);
> + return TEST_FAILURE;
>
> - rcvd = xsk_ring_cons__peek(&xsk->rx, BATCH_SIZE, &idx_rx);
> - if (!rcvd) {
> - if (xsk_ring_prod__needs_wakeup(&umem->fq)) {
> - ret = poll(fds, 1, POLL_TMOUT);
> - if (ret < 0)
> - exit_with_error(-ret);
> }
> - continue;
> +
> + if (!(fds->revents & POLLIN))
> + continue;
> }
>
> + rcvd = xsk_ring_cons__peek(&xsk->rx, BATCH_SIZE, &idx_rx);
> + if (!rcvd)
> + continue;
> +
> if (ifobj->use_fill_ring) {
> ret = xsk_ring_prod__reserve(&umem->fq, rcvd, &idx_fq);
> while (ret != rcvd) {
> @@ -900,13 +911,34 @@ static int receive_pkts(struct ifobject *ifobj, struct pollfd *fds)
> return TEST_PASS;
> }
>
> -static int __send_pkts(struct ifobject *ifobject, u32 *pkt_nb)
> +static int __send_pkts(struct ifobject *ifobject, u32 *pkt_nb, bool use_poll,
> + struct pollfd *fds, bool timeout)
> {
> struct xsk_socket_info *xsk = ifobject->xsk;
> - u32 i, idx, valid_pkts = 0;
> + u32 i, idx, ret, valid_pkts = 0;
> +
> + while (xsk_ring_prod__reserve(&xsk->tx, BATCH_SIZE, &idx) < BATCH_SIZE) {
> + if (use_poll) {
> + ret = poll(fds, 1, POLL_TMOUT);
> + if (timeout) {
> + if (ret < 0) {
> + ksft_print_msg("ERROR: [%s] Poll error %d\n",
> + __func__, ret);
> + return TEST_FAILURE;
> + }
> + if (ret == 0)
> + return TEST_PASS;
> + break;
> + }
> + if (ret <= 0) {
> + ksft_print_msg("ERROR: [%s] Poll error %d\n",
> + __func__, ret);
> + return TEST_FAILURE;
> + }
> + }
>
> - while (xsk_ring_prod__reserve(&xsk->tx, BATCH_SIZE, &idx) < BATCH_SIZE)
> complete_pkts(xsk, BATCH_SIZE);
> + }
>
> for (i = 0; i < BATCH_SIZE; i++) {
> struct xdp_desc *tx_desc = xsk_ring_prod__tx_desc(&xsk->tx, idx + i);
> @@ -933,11 +965,27 @@ static int __send_pkts(struct ifobject *ifobject, u32 *pkt_nb)
>
> xsk_ring_prod__submit(&xsk->tx, i);
> xsk->outstanding_tx += valid_pkts;
> - if (complete_pkts(xsk, i))
> - return TEST_FAILURE;
>
> - usleep(10);
> - return TEST_PASS;
> + if (use_poll) {
> + ret = poll(fds, 1, POLL_TMOUT);
> + if (ret <= 0) {
> + if (ret == 0 && timeout)
> + return TEST_PASS;
> +
> + ksft_print_msg("ERROR: [%s] Poll error %d\n", __func__, ret);
> + return TEST_FAILURE;
> + }
> + }
> +
> + if (!timeout) {
> + if (complete_pkts(xsk, i))
> + return TEST_FAILURE;
> +
> + usleep(10);
> + return TEST_PASS;
> + }
> +
> + return TEST_CONTINUE;
> }
>
> static void wait_for_tx_completion(struct xsk_socket_info *xsk)
> @@ -948,29 +996,19 @@ static void wait_for_tx_completion(struct xsk_socket_info *xsk)
>
> static int send_pkts(struct test_spec *test, struct ifobject *ifobject)
> {
> + bool timeout = (!test->ifobj_rx->umem->umem) ? true : false;
normally instead of such ternary operator to test if some ptr is NULL or
not we would do:
static bool is_umem_valid(struct ifobject *ifobj)
{
return !!ifobj->umem->umem;
}
bool timeout = !is_umem_valid(test->ifobj_rx);
but I think this can stay as is.
> struct pollfd fds = { };
> - u32 pkt_cnt = 0;
> + u32 pkt_cnt = 0, ret;
>
> fds.fd = xsk_socket__fd(ifobject->xsk->xsk);
> fds.events = POLLOUT;
>
> while (pkt_cnt < ifobject->pkt_stream->nb_pkts) {
> - int err;
> -
> - if (ifobject->use_poll) {
> - int ret;
> -
> - ret = poll(&fds, 1, POLL_TMOUT);
> - if (ret <= 0)
> - continue;
> -
> - if (!(fds.revents & POLLOUT))
> - continue;
> - }
> -
> - err = __send_pkts(ifobject, &pkt_cnt);
> - if (err || test->fail)
> + ret = __send_pkts(ifobject, &pkt_cnt, ifobject->use_poll, &fds, timeout);
could you avoid passing ifobject->use_poll explicitly?
> + if ((ret || test->fail) && !timeout)
> return TEST_FAILURE;
> + else if (ret == TEST_PASS && timeout)
> + return ret;
> }
>
> wait_for_tx_completion(ifobject->xsk);
> @@ -1235,7 +1273,7 @@ static void *worker_testapp_validate_rx(void *arg)
>
> pthread_barrier_wait(&barr);
>
> - err = receive_pkts(ifobject, &fds);
> + err = receive_pkts(test, ifobject, &fds);
>
> if (!err && ifobject->validation_func)
> err = ifobject->validation_func(ifobject);
> @@ -1251,6 +1289,33 @@ static void *worker_testapp_validate_rx(void *arg)
> pthread_exit(NULL);
> }
>
> +static int testapp_validate_traffic_single_thread(struct test_spec *test, struct ifobject *ifobj,
> + enum test_type type)
> +{
> + pthread_t t0;
> +
> + if (pthread_barrier_init(&barr, NULL, 2))
> + exit_with_error(errno);
> +
> + test->current_step++;
> + if (type == TEST_TYPE_POLL_RXQ_TMOUT)
> + pkt_stream_reset(ifobj->pkt_stream);
> + pkts_in_flight = 0;
> +
> + /*Spawn thread */
> + pthread_create(&t0, NULL, ifobj->func_ptr, test);
> +
> + if (type != TEST_TYPE_POLL_TXQ_TMOUT)
nit: double space before !=
> + pthread_barrier_wait(&barr);
> +
> + if (pthread_barrier_destroy(&barr))
> + exit_with_error(errno);
> +
> + pthread_join(t0, NULL);
> +
> + return !!test->fail;
> +}
I like this better as it serves its purpose and testapp_validate_traffic()
stays cleaner. Thanks!
> +
> static int testapp_validate_traffic(struct test_spec *test)
> {
> struct ifobject *ifobj_tx = test->ifobj_tx;
> @@ -1548,12 +1613,30 @@ static void run_pkt_test(struct test_spec *test, enum test_mode mode, enum test_
>
> pkt_stream_restore_default(test);
> break;
> - case TEST_TYPE_POLL:
> - test->ifobj_tx->use_poll = true;
> + case TEST_TYPE_RX_POLL:
> test->ifobj_rx->use_poll = true;
> - test_spec_set_name(test, "POLL");
> + test_spec_set_name(test, "POLL_RX");
> + testapp_validate_traffic(test);
> + break;
> + case TEST_TYPE_TX_POLL:
> + test->ifobj_tx->use_poll = true;
> + test_spec_set_name(test, "POLL_TX");
> testapp_validate_traffic(test);
> break;
> + case TEST_TYPE_POLL_TXQ_TMOUT:
> + test_spec_set_name(test, "POLL_TXQ_FULL");
> + test->ifobj_tx->use_poll = true;
> + /* create invalid frame by set umem frame_size and pkt length equal to 2048 */
> + test->ifobj_tx->umem->frame_size = 2048;
> + pkt_stream_replace(test, 2 * DEFAULT_PKT_CNT, 2048);
> + testapp_validate_traffic_single_thread(test, test->ifobj_tx, type);
> + pkt_stream_restore_default(test);
> + break;
> + case TEST_TYPE_POLL_RXQ_TMOUT:
> + test_spec_set_name(test, "POLL_RXQ_EMPTY");
> + test->ifobj_rx->use_poll = true;
> + testapp_validate_traffic_single_thread(test, test->ifobj_rx, type);
> + break;
> case TEST_TYPE_ALIGNED_INV_DESC:
> test_spec_set_name(test, "ALIGNED_INV_DESC");
> testapp_invalid_desc(test);
> diff --git a/tools/testing/selftests/bpf/xskxceiver.h b/tools/testing/selftests/bpf/xskxceiver.h
> index 3d17053f98e5..ee97576757a9 100644
> --- a/tools/testing/selftests/bpf/xskxceiver.h
> +++ b/tools/testing/selftests/bpf/xskxceiver.h
> @@ -27,6 +27,7 @@
>
> #define TEST_PASS 0
> #define TEST_FAILURE -1
> +#define TEST_CONTINUE 1
> #define MAX_INTERFACES 2
> #define MAX_INTERFACE_NAME_CHARS 7
> #define MAX_INTERFACES_NAMESPACE_CHARS 10
> @@ -48,7 +49,7 @@
> #define SOCK_RECONF_CTR 10
> #define BATCH_SIZE 64
> #define POLL_TMOUT 1000
> -#define RECV_TMOUT 3
> +#define THREAD_TMOUT 3
> #define DEFAULT_PKT_CNT (4 * 1024)
> #define DEFAULT_UMEM_BUFFERS (DEFAULT_PKT_CNT / 4)
> #define UMEM_SIZE (DEFAULT_UMEM_BUFFERS * XSK_UMEM__DEFAULT_FRAME_SIZE)
> @@ -68,7 +69,10 @@ enum test_type {
> TEST_TYPE_RUN_TO_COMPLETION,
> TEST_TYPE_RUN_TO_COMPLETION_2K_FRAME,
> TEST_TYPE_RUN_TO_COMPLETION_SINGLE_PKT,
> - TEST_TYPE_POLL,
> + TEST_TYPE_RX_POLL,
> + TEST_TYPE_TX_POLL,
> + TEST_TYPE_POLL_RXQ_TMOUT,
> + TEST_TYPE_POLL_TXQ_TMOUT,
> TEST_TYPE_UNALIGNED,
> TEST_TYPE_ALIGNED_INV_DESC,
> TEST_TYPE_ALIGNED_INV_DESC_2K_FRAME,
> --
> 2.34.1
>
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