From eaf8c6eec5f9ab5d9d7155d7041fb7eea7028052 Mon Sep 17 00:00:00 2001 From: John Fastabend Date: Mon, 22 Jan 2018 10:35:45 -0800 Subject: [PATCH] bpf: add sendmsg option for testing BPF programs When testing BPF programs using sockmap I often want to have more control over how sendmsg is exercised. This becomes even more useful as new sockmap program types are added. This adds a test type option to select type of test to run. Currently, only "ping" and "sendmsg" are supported, but more can be added as needed. The new help argument gives the following, Usage: ./sockmap --cgroup options: --help -h --cgroup -c --rate -r --verbose -v --iov_count -i --length -l --test -t Signed-off-by: John Fastabend Signed-off-by: Daniel Borkmann --- samples/sockmap/sockmap_user.c | 148 ++++++++++++++++++++++++++++++++- 1 file changed, 145 insertions(+), 3 deletions(-) diff --git a/samples/sockmap/sockmap_user.c b/samples/sockmap/sockmap_user.c index ffd1d127a9d350..ccc717349eba2f 100644 --- a/samples/sockmap/sockmap_user.c +++ b/samples/sockmap/sockmap_user.c @@ -56,6 +56,9 @@ static const struct option long_options[] = { {"cgroup", required_argument, NULL, 'c' }, {"rate", required_argument, NULL, 'r' }, {"verbose", no_argument, NULL, 'v' }, + {"iov_count", required_argument, NULL, 'i' }, + {"length", required_argument, NULL, 'l' }, + {"test", required_argument, NULL, 't' }, {0, 0, NULL, 0 } }; @@ -182,6 +185,118 @@ static int sockmap_init_sockets(void) return 0; } +struct msg_stats { + size_t bytes_sent; + size_t bytes_recvd; +}; + +static int msg_loop(int fd, int iov_count, int iov_length, int cnt, + struct msg_stats *s, bool tx) +{ + struct msghdr msg = {0}; + struct iovec *iov; + int i, flags = 0; + + iov = calloc(iov_count, sizeof(struct iovec)); + if (!iov) + return errno; + + for (i = 0; i < iov_count; i++) { + char *d = calloc(iov_length, sizeof(char)); + + if (!d) { + fprintf(stderr, "iov_count %i/%i OOM\n", i, iov_count); + goto out_errno; + } + iov[i].iov_base = d; + iov[i].iov_len = iov_length; + } + + msg.msg_iov = iov; + msg.msg_iovlen = iov_count; + + if (tx) { + for (i = 0; i < cnt; i++) { + int sent = sendmsg(fd, &msg, flags); + + if (sent < 0) { + perror("send loop error:"); + goto out_errno; + } + s->bytes_sent += sent; + } + } else { + int slct, recv, max_fd = fd; + struct timeval timeout; + float total_bytes; + fd_set w; + + total_bytes = (float)iov_count * (float)iov_length * (float)cnt; + while (s->bytes_recvd < total_bytes) { + timeout.tv_sec = 1; + timeout.tv_usec = 0; + + /* FD sets */ + FD_ZERO(&w); + FD_SET(fd, &w); + + slct = select(max_fd + 1, &w, NULL, NULL, &timeout); + if (slct == -1) { + perror("select()"); + goto out_errno; + } else if (!slct) { + fprintf(stderr, "unexpected timeout\n"); + errno = -EIO; + goto out_errno; + } + + recv = recvmsg(fd, &msg, flags); + if (recv < 0) { + if (errno != EWOULDBLOCK) { + perror("recv failed()\n"); + goto out_errno; + } + } + + s->bytes_recvd += recv; + } + } + + for (i = 0; i < iov_count; i++) + free(iov[i].iov_base); + free(iov); + return 0; +out_errno: + for (i = 0; i < iov_count; i++) + free(iov[i].iov_base); + free(iov); + return errno; +} + +static int sendmsg_test(int iov_count, int iov_buf, int cnt, int verbose) +{ + struct msg_stats s = {0}; + int err; + + err = msg_loop(c1, iov_count, iov_buf, cnt, &s, true); + if (err) { + fprintf(stderr, + "msg_loop_tx: iov_count %i iov_buf %i cnt %i err %i\n", + iov_count, iov_buf, cnt, err); + return err; + } + + err = msg_loop(p2, iov_count, iov_buf, cnt, &s, false); + if (err) + fprintf(stderr, + "msg_loop_rx: iov_count %i iov_buf %i cnt %i err %i\n", + iov_count, iov_buf, cnt, err); + + fprintf(stdout, "sendmsg: TX_bytes %zu RX_bytes %zu\n", + s.bytes_sent, s.bytes_recvd); + return err; +} + static int forever_ping_pong(int rate, int verbose) { struct timeval timeout; @@ -257,13 +372,19 @@ static int forever_ping_pong(int rate, int verbose) return 0; } +enum { + PING_PONG, + SENDMSG, +}; + int main(int argc, char **argv) { - int rate = 1, verbose = 0; + int iov_count = 1, length = 1024, rate = 1, verbose = 0; int opt, longindex, err, cg_fd = 0; + int test = PING_PONG; char filename[256]; - while ((opt = getopt_long(argc, argv, "hvc:r:", + while ((opt = getopt_long(argc, argv, "hvc:r:i:l:t:", long_options, &longindex)) != -1) { switch (opt) { /* Cgroup configuration */ @@ -282,6 +403,22 @@ int main(int argc, char **argv) case 'v': verbose = 1; break; + case 'i': + iov_count = atoi(optarg); + break; + case 'l': + length = atoi(optarg); + break; + case 't': + if (strcmp(optarg, "ping") == 0) { + test = PING_PONG; + } else if (strcmp(optarg, "sendmsg") == 0) { + test = SENDMSG; + } else { + usage(argv); + return -1; + } + break; case 'h': default: usage(argv); @@ -339,7 +476,12 @@ int main(int argc, char **argv) goto out; } - err = forever_ping_pong(rate, verbose); + if (test == PING_PONG) + err = forever_ping_pong(rate, verbose); + else if (test == SENDMSG) + err = sendmsg_test(iov_count, length, rate, verbose); + else + fprintf(stderr, "unknown test\n"); out: close(s1); close(s2);