net-timestamp: no-payload option in txtimestamp test

Demonstrate how SOF_TIMESTAMPING_OPT_TSONLY can be used and
test the implementation.

Signed-off-by: Willem de Bruijn <willemb@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/Documentation/networking/timestamping/txtimestamp.c b/Documentation/networking/timestamping/txtimestamp.c
index 05694febc2387a914f0aeb90eb4478df65e011b9..8217510d3842b3a7e599a92c7f7502d2bbdcde86 100644 (file)
--- a/Documentation/networking/timestamping/txtimestamp.c
+++ b/Documentation/networking/timestamping/txtimestamp.c
@@ -70,6 +70,7 @@ static int do_ipv6 = 1;
 static int cfg_payload_len = 10;
 static bool cfg_show_payload;
 static bool cfg_do_pktinfo;
+static bool cfg_loop_nodata;
 static uint16_t dest_port = 9000;
 
 static struct sockaddr_in daddr;
@@ -141,6 +142,9 @@ static void print_payload(char *data, int len)
 {
        int i;
 
+       if (!len)
+               return;
+
        if (len > 70)
                len = 70;
 
@@ -177,6 +181,7 @@ static void __recv_errmsg_cmsg(struct msghdr *msg, int payload_len)
        struct sock_extended_err *serr = NULL;
        struct scm_timestamping *tss = NULL;
        struct cmsghdr *cm;
+       int batch = 0;
 
        for (cm = CMSG_FIRSTHDR(msg);
             cm && cm->cmsg_len;
@@ -209,10 +214,18 @@ static void __recv_errmsg_cmsg(struct msghdr *msg, int payload_len)
                } else
                        fprintf(stderr, "unknown cmsg %d,%d\n",
                                        cm->cmsg_level, cm->cmsg_type);
+
+               if (serr && tss) {
+                       print_timestamp(tss, serr->ee_info, serr->ee_data,
+                                       payload_len);
+                       serr = NULL;
+                       tss = NULL;
+                       batch++;
+               }
        }
 
-       if (serr && tss)
-               print_timestamp(tss, serr->ee_info, serr->ee_data, payload_len);
+       if (batch > 1)
+               fprintf(stderr, "batched %d timestamps\n", batch);
 }
 
 static int recv_errmsg(int fd)
@@ -244,7 +257,7 @@ static int recv_errmsg(int fd)
        if (ret == -1 && errno != EAGAIN)
                error(1, errno, "recvmsg");
 
-       if (ret > 0) {
+       if (ret >= 0) {
                __recv_errmsg_cmsg(&msg, ret);
                if (cfg_show_payload)
                        print_payload(data, cfg_payload_len);
@@ -309,6 +322,9 @@ static void do_test(int family, unsigned int opt)
        opt |= SOF_TIMESTAMPING_SOFTWARE |
               SOF_TIMESTAMPING_OPT_CMSG |
               SOF_TIMESTAMPING_OPT_ID;
+       if (cfg_loop_nodata)
+               opt |= SOF_TIMESTAMPING_OPT_TSONLY;
+
        if (setsockopt(fd, SOL_SOCKET, SO_TIMESTAMPING,
                       (char *) &opt, sizeof(opt)))
                error(1, 0, "setsockopt timestamping");
@@ -378,6 +394,7 @@ static void __attribute__((noreturn)) usage(const char *filepath)
                        "  -h:   show this message\n"
                        "  -I:   request PKTINFO\n"
                        "  -l N: send N bytes at a time\n"
+                       "  -n:   set no-payload option\n"
                        "  -r:   use raw\n"
                        "  -R:   use raw (IP_HDRINCL)\n"
                        "  -p N: connect to port N\n"
@@ -392,7 +409,7 @@ static void parse_opt(int argc, char **argv)
        int proto_count = 0;
        char c;
 
-       while ((c = getopt(argc, argv, "46hIl:p:rRux")) != -1) {
+       while ((c = getopt(argc, argv, "46hIl:np:rRux")) != -1) {
                switch (c) {
                case '4':
                        do_ipv6 = 0;
@@ -403,6 +420,9 @@ static void parse_opt(int argc, char **argv)
                case 'I':
                        cfg_do_pktinfo = true;
                        break;
+               case 'n':
+                       cfg_loop_nodata = true;
+                       break;
                case 'r':
                        proto_count++;
                        cfg_proto = SOCK_RAW;