Add Launch Time hw offload request to xdp_hw_metadata. User can configure the delta of launch time to HW RX-time by using "-l" argument. The default delta is 100,000,000 nanosecond.

Signed-off-by: Song Yoong Siang yoong.siang.song@intel.com --- tools/testing/selftests/bpf/xdp_hw_metadata.c | 30 +++++++++++++++++-- 1 file changed, 27 insertions(+), 3 deletions(-)

diff --git a/tools/testing/selftests/bpf/xdp_hw_metadata.c b/tools/testing/selftests/bpf/xdp_hw_metadata.c index 6f7b15d6c6ed..795c1d14e02d 100644 --- a/tools/testing/selftests/bpf/xdp_hw_metadata.c +++ b/tools/testing/selftests/bpf/xdp_hw_metadata.c @@ -13,6 +13,7 @@ * - UDP 9091 packets trigger TX reply * - TX HW timestamp is requested and reported back upon completion * - TX checksum is requested + * - TX launch time HW offload is requested for transmission */

#include <test_progs.h> @@ -64,6 +65,8 @@ int rxq; bool skip_tx; __u64 last_hw_rx_timestamp; __u64 last_xdp_rx_timestamp; +__u64 last_launch_time; +__u64 launch_time_delta_to_hw_rx_timestamp = 100000000; /* 0.1 second */

void test__fail(void) { /* for network_helpers.c */ }

@@ -298,6 +301,8 @@ static bool complete_tx(struct xsk *xsk, clockid_t clock_id) if (meta->completion.tx_timestamp) { __u64 ref_tstamp = gettime(clock_id);

+ print_tstamp_delta("HW Launch-time", "HW TX-complete-time", + last_launch_time, meta->completion.tx_timestamp); print_tstamp_delta("HW TX-complete-time", "User TX-complete-time", meta->completion.tx_timestamp, ref_tstamp); print_tstamp_delta("XDP RX-time", "User TX-complete-time", @@ -395,6 +400,14 @@ static void ping_pong(struct xsk *xsk, void *rx_packet, clockid_t clock_id) xsk, ntohs(udph->check), ntohs(want_csum), meta->request.csum_start, meta->request.csum_offset);

+ /* Set the value of launch time */ + meta->flags |= XDP_TXMD_FLAGS_LAUNCH_TIME; + meta->request.launch_time = last_hw_rx_timestamp + + launch_time_delta_to_hw_rx_timestamp; + last_launch_time = meta->request.launch_time; + print_tstamp_delta("HW RX-time", "HW Launch-time", last_hw_rx_timestamp, + meta->request.launch_time); + memcpy(data, rx_packet, len); /* don't share umem chunk for simplicity */ tx_desc->options |= XDP_TX_METADATA; tx_desc->len = len; @@ -402,10 +415,14 @@ static void ping_pong(struct xsk *xsk, void *rx_packet, clockid_t clock_id) xsk_ring_prod__submit(&xsk->tx, 1); }

+#define SLEEP_PER_ITERATION_IN_US 10 +#define SLEEP_PER_ITERATION_IN_NS (SLEEP_PER_ITERATION_IN_US * 1000) +#define MAX_ITERATION(x) (((x) / SLEEP_PER_ITERATION_IN_NS) + 500) static int verify_metadata(struct xsk *rx_xsk, int rxq, int server_fd, clockid_t clock_id) { const struct xdp_desc *rx_desc; struct pollfd fds[rxq + 1]; + int max_iterations; __u64 comp_addr; __u64 addr; __u32 idx = 0; @@ -418,6 +435,9 @@ static int verify_metadata(struct xsk *rx_xsk, int rxq, int server_fd, clockid_t fds[i].revents = 0; }

+ /* Calculate max iterations to wait for transmit completion */ + max_iterations = MAX_ITERATION(launch_time_delta_to_hw_rx_timestamp); + fds[rxq].fd = server_fd; fds[rxq].events = POLLIN; fds[rxq].revents = 0; @@ -477,10 +497,10 @@ static int verify_metadata(struct xsk *rx_xsk, int rxq, int server_fd, clockid_t if (ret) printf("kick_tx ret=%d\n", ret);

- for (int j = 0; j < 500; j++) { + for (int j = 0; j < max_iterations; j++) { if (complete_tx(xsk, clock_id)) break; - usleep(10); + usleep(SLEEP_PER_ITERATION_IN_US); } } } @@ -608,6 +628,7 @@ static void print_usage(void) " -h Display this help and exit\n\n" " -m Enable multi-buffer XDP for larger MTU\n" " -r Don't generate AF_XDP reply (rx metadata only)\n" + " -l Delta of launch time to HW RX-time in ns (default: 100,000,000ns)\n" "Generate test packets on the other machine with:\n" " echo -n xdp | nc -u -q1 <dst_ip> 9091\n";

@@ -618,7 +639,7 @@ static void read_args(int argc, char *argv[]) { int opt;

- while ((opt = getopt(argc, argv, "chmr")) != -1) { + while ((opt = getopt(argc, argv, "chmrl:")) != -1) { switch (opt) { case 'c': bind_flags &= ~XDP_USE_NEED_WAKEUP; @@ -634,6 +655,9 @@ static void read_args(int argc, char *argv[]) case 'r': skip_tx = true; break; + case 'l': + launch_time_delta_to_hw_rx_timestamp = atoll(optarg); + break; case '?': if (isprint(optopt)) fprintf(stderr, "Unknown option: -%c\n", optopt);