From: Willem de Bruijn <[email protected]> Detect software pacing in so_txtime.c using SO_TIMESTAMPING.
If '-H' (hw) is passed 1. measure sw tx delay with SOF_TIMESTAMPING_TX_SOFTWARE, and 2. fail if delay exceeds a threshold, indicating pacing Also extend while condition to account for possible variance. This applies to all tests, not just the new '-H' variants. Also reorder getopt parameters to make them alphabetical. Signed-off-by: Willem de Bruijn <[email protected]> --- Changes v3 -> v4 - rename -h to -H to avoid aliasing implicit getopt -h - count sw timestamps to verify that they were actually checked - (minor) do not ask for SOF_TIMESTAMPING_OPT_ID as not used - (minor) remove unused parameter Reading timestamps from the error queue is never particularly slow, so errors are always counted, not only if !KSFT_MACHINE_SLOW. --- .../testing/selftests/drivers/net/so_txtime.c | 93 +++++++++++++++---- 1 file changed, 77 insertions(+), 16 deletions(-) diff --git a/tools/testing/selftests/drivers/net/so_txtime.c b/tools/testing/selftests/drivers/net/so_txtime.c index f6f3253ed174..951312e67b66 100644 --- a/tools/testing/selftests/drivers/net/so_txtime.c +++ b/tools/testing/selftests/drivers/net/so_txtime.c @@ -42,8 +42,10 @@ static bool cfg_machine_slow; static uint64_t cfg_start_time_ns; static int cfg_mark; static bool cfg_rx; +static bool cfg_verify_hw_offload; static uint64_t glob_tstart; +static uint64_t glob_tstart_real; static uint64_t tdeliver_max; static int errors; @@ -191,12 +193,32 @@ static int do_recv_errqueue_txtime(struct sock_extended_err *err, return 1; } -static int do_recv_errqueue(int fdt) +static int do_recv_errqueue_timestamping(struct scm_timestamping *tss) +{ + int64_t ts; + + ts = tss->ts[0].tv_sec * 1000ULL * 1000 * 1000; + ts += tss->ts[0].tv_nsec; + ts -= glob_tstart_real; + ts /= 1000; + + if (ts > cfg_variance_us) { + fprintf(stderr, "sw delay %" PRId64 "us exceeds bounds\n", ts); + if (!cfg_machine_slow) + errors++; + } + + return 1; +} + +static int do_recv_errqueue(int fdt, int *num_ts) { char control[CMSG_SPACE(sizeof(struct sock_extended_err)) + + CMSG_SPACE(sizeof(struct scm_timestamping)) + CMSG_SPACE(sizeof(struct sockaddr_in6))] = {0}; char data[sizeof(struct ethhdr) + sizeof(struct ipv6hdr) + sizeof(struct udphdr) + 1]; + struct scm_timestamping *tss; struct sock_extended_err *err; int ret, num_tstamp = 0; struct msghdr msg = {0}; @@ -222,16 +244,29 @@ static int do_recv_errqueue(int fdt) error(1, 0, "errqueue: flags 0x%x\n", msg.msg_flags); cm = CMSG_FIRSTHDR(&msg); + tss = NULL; + + if (cm->cmsg_level == SOL_SOCKET && + cm->cmsg_type == SCM_TIMESTAMPING) { + tss = (void *)CMSG_DATA(cm); + cm = CMSG_NXTHDR(&msg, cm); + if (!cm) + error(1, 0, "timestamp missing ip err\n"); + } + if (cm->cmsg_level != cfg_errq_level || cm->cmsg_type != cfg_errq_type) error(1, 0, "errqueue: type 0x%x.0x%x\n", cm->cmsg_level, cm->cmsg_type); err = (struct sock_extended_err *)CMSG_DATA(cm); - if (err->ee_origin != SO_EE_ORIGIN_TXTIME) + if (err->ee_origin == SO_EE_ORIGIN_TXTIME) + num_tstamp += do_recv_errqueue_txtime(err, data[ret - 1]); + else if (err->ee_origin == SO_EE_ORIGIN_TIMESTAMPING && tss) + *num_ts += do_recv_errqueue_timestamping(tss); + else error(1, 0, "errqueue: origin 0x%x\n", err->ee_origin); - num_tstamp += do_recv_errqueue_txtime(err, data[ret - 1]); msg.msg_flags = 0; msg.msg_controllen = sizeof(control); } @@ -243,7 +278,7 @@ static void recv_errqueue_msgs(int fdt) { struct pollfd pfd = { .fd = fdt, .events = POLLERR }; const int timeout_ms = 10; - int ret, num_tstamp = 0; + int ret, num_tstamp = 0, num_ts = 0; do { ret = poll(&pfd, 1, timeout_ms); @@ -251,12 +286,19 @@ static void recv_errqueue_msgs(int fdt) error(1, errno, "poll"); if (ret && (pfd.revents & POLLERR)) - num_tstamp += do_recv_errqueue(fdt); + num_tstamp += do_recv_errqueue(fdt, &num_ts); - if (num_tstamp == cfg_num_pkt) + if (num_tstamp == cfg_num_pkt || num_ts == cfg_num_pkt) break; - } while (gettime_ns(cfg_clockid) < tdeliver_max); + } while (gettime_ns(cfg_clockid) < + tdeliver_max + (cfg_variance_us * 1000)); + + if (cfg_verify_hw_offload && num_ts != cfg_num_pkt) { + fprintf(stderr, "missing timestamps: expected %d, got %d\n", + cfg_num_pkt, num_ts); + errors++; + } } static void start_time_wait(void) @@ -301,6 +343,17 @@ static void setsockopt_txtime(int fd) error(1, 0, "getsockopt txtime: mismatch"); } +static void setsockopt_txtimestamping(int fd) +{ + int val = SOF_TIMESTAMPING_TX_SOFTWARE | + SOF_TIMESTAMPING_SOFTWARE | + SOF_TIMESTAMPING_OPT_TSONLY; + + if (setsockopt(fd, SOL_SOCKET, SO_TIMESTAMPING, + &val, sizeof(val))) + error(1, errno, "setsockopt timestamping"); +} + static int setup_tx(struct sockaddr *addr, socklen_t alen) { int fd; @@ -314,6 +367,9 @@ static int setup_tx(struct sockaddr *addr, socklen_t alen) setsockopt_txtime(fd); + if (cfg_verify_hw_offload) + setsockopt_txtimestamping(fd); + if (cfg_mark && setsockopt(fd, SOL_SOCKET, SO_MARK, &cfg_mark, sizeof(cfg_mark))) error(1, errno, "setsockopt mark"); @@ -354,6 +410,7 @@ static void do_test_tx(struct sockaddr *addr, socklen_t alen) start_time_wait(); glob_tstart = gettime_ns(cfg_clockid); + glob_tstart_real = gettime_ns(CLOCK_REALTIME); for (i = 0; i < cfg_num_pkt; i++) do_send_one(fdt, &cfg_buf[i]); @@ -446,10 +503,11 @@ static void usage(const char *progname) " -6 only IPv6\n" " -c <clock> monotonic or tai (default)\n" " -D <addr> destination IP address (server)\n" - " -S <addr> source IP address (client)\n" + " -H verify hardware offload (tx)\n" + " -m <mark> socket mark\n" " -r run rx mode\n" + " -S <addr> source IP address (client)\n" " -t <nsec> start time (UTC nanoseconds)\n" - " -m <mark> socket mark\n" "\n", progname); exit(1); @@ -461,7 +519,7 @@ static void parse_opts(int argc, char **argv) int domain = PF_UNSPEC; int c; - while ((c = getopt(argc, argv, "46c:S:D:rt:m:")) != -1) { + while ((c = getopt(argc, argv, "46c:D:Hm:rS:t:")) != -1) { switch (c) { case '4': if (domain != PF_UNSPEC) @@ -488,21 +546,24 @@ static void parse_opts(int argc, char **argv) else error(1, 0, "unknown clock id %s", optarg); break; - case 'S': - saddr = optarg; - break; case 'D': daddr = optarg; break; + case 'H': + cfg_verify_hw_offload = true; + break; + case 'm': + cfg_mark = strtol(optarg, NULL, 0); + break; case 'r': cfg_rx = true; break; + case 'S': + saddr = optarg; + break; case 't': cfg_start_time_ns = strtoll(optarg, NULL, 0); break; - case 'm': - cfg_mark = strtol(optarg, NULL, 0); - break; default: usage(argv[0]); } -- 2.55.0.679.g6767b8d81c-goog
