new file mode 100644
@@ -0,0 +1,178 @@
+The existing interfaces for getting network packages time stamped are:
+
+* SO_TIMESTAMP
+ Generate time stamp for each incoming packet using the (not necessarily
+ monotonous!) system time. Result is returned via recv_msg() in a
+ control message as timeval (usec resolution).
+
+* SO_TIMESTAMPNS
+ Same time stamping mechanism as SO_TIMESTAMP, but returns result as
+ timespec (nsec resolution).
+
+* IP_MULTICAST_LOOP + SO_TIMESTAMP[NS]
+ Only for multicasts: approximate send time stamp by receiving the looped
+ packet and using its receive time stamp.
+
+The following interface complements the existing ones: receive time
+stamps can be generated and returned for arbitrary packets and much
+closer to the point where the packet is really sent. Time stamps can
+be generated in software (as before) or in hardware (if the hardware
+has such a feature).
+
+SO_TIMESTAMPING:
+
+Instructs the socket layer which kind of information is wanted. The
+parameter is an integer with some of the following bits set. Setting
+other bits is an error and doesn't change the current state.
+
+SOF_TIMESTAMPING_TX_HARDWARE: try to obtain send time stamp in hardware
+SOF_TIMESTAMPING_TX_SOFTWARE: if SOF_TIMESTAMPING_TX_HARDWARE is off or
+ fails, then do it in software
+SOF_TIMESTAMPING_RX_HARDWARE: return the original, unmodified time stamp
+ as generated by the hardware
+SOF_TIMESTAMPING_RX_SOFTWARE: if SOF_TIMESTAMPING_RX_HARDWARE is off or
+ fails, then do it in software
+SOF_TIMESTAMPING_RAW_HARDWARE: return original raw hardware time stamp
+SOF_TIMESTAMPING_SYS_HARDWARE: return hardware time stamp transformed to
+ the system time base
+SOF_TIMESTAMPING_SOFTWARE: return system time stamp generated in
+ software
+
+SOF_TIMESTAMPING_TX/RX determine how time stamps are generated.
+SOF_TIMESTAMPING_RAW/SYS determine how they are reported in the
+following control message:
+ struct scm_timestamping {
+ struct timespec systime;
+ struct timespec hwtimetrans;
+ struct timespec hwtimeraw;
+ };
+
+recvmsg() can be used to get this control message for regular incoming
+packets. For send time stamps the outgoing packet is looped back to
+the socket's error queue with the send time stamp(s) attached. It can
+be received with recvmsg(flags=MSG_ERRQUEUE). The call returns the
+original outgoing packet data including all headers preprended down to
+and including the link layer, the scm_timestamping control message and
+a sock_extended_err control message with ee_errno==ENOMSG and
+ee_origin==SO_EE_ORIGIN_TIMESTAMPING. A socket with such a pending
+bounced packet is ready for reading as far as select() is concerned.
+
+All three values correspond to the same event in time, but were
+generated in different ways. Each of these values may be empty (= all
+zero), in which case no such value was available. If the application
+is not interested in some of these values, they can be left blank to
+avoid the potential overhead of calculating them.
+
+systime is the value of the system time at that moment. This
+corresponds to the value also returned via SO_TIMESTAMP[NS]. If the
+time stamp was generated by hardware, then this field is
+empty. Otherwise it is filled in if SOF_TIMESTAMPING_SOFTWARE is
+set.
+
+hwtimeraw is the original hardware time stamp. Filled in if
+SOF_TIMESTAMPING_RAW_HARDWARE is set. No assumptions about its
+relation to system time should be made.
+
+hwtimetrans is the hardware time stamp transformed so that it
+corresponds as good as possible to system time. This correlation is
+not perfect; as a consequence, sorting packets received via different
+NICs by their hwtimetrans may differ from the order in which they were
+received. hwtimetrans may be non-monotonic even for the same NIC.
+Filled in if SOF_TIMESTAMPING_SYS_HARDWARE is set. Requires support
+by the network device and will be empty without that support.
+
+
+SIOCSHWTSTAMP:
+
+Hardware time stamping must also be initialized for each device driver
+that is expected to do hardware time stamping. The parameter is:
+
+struct hwtstamp_config {
+ int flags; /* no flags defined right now, must be zero */
+ int tx_type; /* HWTSTAMP_TX_* */
+ int rx_filter; /* HWTSTAMP_FILTER_* */
+};
+
+Desired behavior is passed into the kernel and to a specific device by
+calling ioctl(SIOCSHWTSTAMP) with a pointer to a struct ifreq whose
+ifr_data points to a struct hwtstamp_config. The tx_type and
+rx_filter are hints to the driver what it is expected to do. If
+the requested fine-grained filtering for incoming packets is not
+supported, the driver may time stamp more than just the requested types
+of packets.
+
+A driver which supports hardware time stamping shall update the struct
+with the actual, possibly more permissive configuration. If the
+requested packets cannot be time stamped, then nothing should be
+changed and ERANGE shall be returned (in contrast to EINVAL, which
+indicates that SIOCSHWTSTAMP is not supported at all).
+
+Only a processes with admin rights may change the configuration. User
+space is responsible to ensure that multiple processes don't interfere
+with each other and that the settings are reset.
+
+/* possible values for hwtstamp_config->tx_type */
+enum {
+ /*
+ * no outgoing packet will need hardware time stamping;
+ * should a packet arrive which asks for it, no hardware
+ * time stamping will be done
+ */
+ HWTSTAMP_TX_OFF,
+
+ /*
+ * enables hardware time stamping for outgoing packets;
+ * the sender of the packet decides which are to be
+ * time stamped by setting SOF_TIMESTAMPING_TX_SOFTWARE
+ * before sending the packet
+ */
+ HWTSTAMP_TX_ON,
+};
+
+/* possible values for hwtstamp_config->rx_filter */
+enum {
+ /* time stamp no incoming packet at all */
+ HWTSTAMP_FILTER_NONE,
+
+ /* time stamp any incoming packet */
+ HWTSTAMP_FILTER_ALL,
+
+ /* return value: time stamp all packets requested plus some others */
+ HWTSTAMP_FILTER_SOME,
+
+ /* PTP v1, UDP, any kind of event packet */
+ HWTSTAMP_FILTER_PTP_V1_L4_EVENT,
+
+ ...
+};
+
+
+DEVICE IMPLEMENTATION
+
+A driver which supports hardware time stamping must support the
+SIOCSHWTSTAMP ioctl. Time stamps for received packets must be stored
+in the skb with skb_hwtstamp_set().
+
+Time stamps for outgoing packets are to be generated as follows:
+- In hard_start_xmit(), check if skb_hwtstamp_check_tx_hardware()
+ returns non-zero. If yes, then the driver is expected
+ to do hardware time stamping.
+- If this is possible for the skb and requested, then declare
+ that the driver is doing the time stamping by calling
+ skb_hwtstamp_tx_in_progress(). A driver not supporting
+ hardware time stamping doesn't do that. A driver must never
+ touch sk_buff::tstamp! It is used to store how time stamping
+ for an outgoing packets is to be done.
+- As soon as the driver has sent the packet and/or obtained a
+ hardware time stamp for it, it passes the time stamp back by
+ calling skb_hwtstamp_tx() with the original skb, the raw
+ hardware time stamp and a handle to the device (necessary
+ to convert the hardware time stamp to system time). If obtaining
+ the hardware time stamp somehow fails, then the driver should
+ not fall back to software time stamping. The rationale is that
+ this would occur at a later time in the processing pipeline
+ than other software time stamping and therefore could lead
+ to unexpected deltas between time stamps.
+- If the driver did not call skb_hwtstamp_tx_in_progress(), then
+ dev_hard_start_xmit() checks whether software time stamping
+ is wanted as fallback and potentially generates the time stamp.
new file mode 100644
@@ -0,0 +1 @@
+timestamping
new file mode 100644
@@ -0,0 +1,3 @@
+CPPFLAGS = -I../../../include
+
+timestamping: timestamping.c
new file mode 100644
@@ -0,0 +1,469 @@
+/*
+ * This program demonstrates how the various time stamping features in
+ * the Linux kernel work. It emulates the behavior of a PTP
+ * implementation in stand-alone master mode by sending PTPv1 Sync
+ * multicasts once every second. It looks for similar packets, but
+ * beyond that doesn't actually implement PTP.
+ *
+ * Outgoing packets are time stamped with SO_TIMESTAMPING with or
+ * without hardware support.
+ *
+ * Incoming packets are time stamped with SO_TIMESTAMPING with or
+ * without hardware support, SIOCGSTAMP[NS] (per-socket time stamp) and
+ * SO_TIMESTAMP[NS].
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <errno.h>
+#include <string.h>
+
+#include <sys/time.h>
+#include <sys/socket.h>
+#include <sys/select.h>
+#include <sys/ioctl.h>
+#include <arpa/inet.h>
+#include <net/if.h>
+
+#include "asm/types.h"
+#include "linux/net_tstamp.h"
+#include "linux/errqueue.h"
+
+#ifndef SO_TIMESTAMPNS
+# define SO_TIMESTAMPNS 35
+#endif
+
+#ifndef SIOCGSTAMPNS
+# define SIOCGSTAMPNS 0x8907
+#endif
+
+static void usage(const char *error)
+{
+ if (error)
+ printf("invalid option: %s\n", error);
+ printf("timestamping interface (IP_MULTICAST_LOOP|SO_TIMESTAMP|SO_TIMESTAMPNS|SOF_TIMESTAMPING_TX_HARDWARE|SOF_TIMESTAMPING_TX_SOFTWARE|SOF_TIMESTAMPING_RX_HARDWARE|SOF_TIMESTAMPING_RX_SOFTWARE|SOF_TIMESTAMPING_SOFTWARE|SOF_TIMESTAMPING_SYS_HARDWARE|SOF_TIMESTAMPING_RAW_HARDWARE|SIOCGSTAMP|SIOCGSTAMPNS)*\n");
+ exit(1);
+}
+
+static void bail(const char *error)
+{
+ printf("%s: %s\n", error, strerror(errno));
+ exit(1);
+}
+
+static const unsigned char sync[] = {
+ 0x00,0x01, 0x00,0x01,
+ 0x5f,0x44, 0x46,0x4c,
+ 0x54,0x00, 0x00,0x00,
+ 0x00,0x00, 0x00,0x00,
+ 0x00,0x00, 0x00,0x00,
+ 0x01,0x01,
+
+ /* fake uuid */
+ 0x00,0x01,
+ 0x02,0x03, 0x04,0x05,
+
+ 0x00,0x01, 0x00,0x37,
+ 0x00,0x00, 0x00,0x08,
+ 0x00,0x00, 0x00,0x00,
+ 0x49,0x05, 0xcd,0x01,
+ 0x29,0xb1, 0x8d,0xb0,
+ 0x00,0x00, 0x00,0x00,
+ 0x00,0x01,
+
+ /* fake uuid */
+ 0x00,0x01,
+ 0x02,0x03, 0x04,0x05,
+
+ 0x00,0x00, 0x00,0x37,
+ 0x00,0x00, 0x00,0x04,
+ 0x44,0x46, 0x4c,0x54,
+ 0x00,0x00, 0xf0,0x60,
+ 0x00,0x01, 0x00,0x00,
+ 0x00,0x00, 0x00,0x01,
+ 0x00,0x00, 0xf0,0x60,
+ 0x00,0x00, 0x00,0x00,
+ 0x00,0x00, 0x00,0x04,
+ 0x44,0x46, 0x4c,0x54,
+ 0x00,0x01,
+
+ /* fake uuid */
+ 0x00,0x01,
+ 0x02,0x03, 0x04,0x05,
+
+ 0x00,0x00, 0x00,0x00,
+ 0x00,0x00, 0x00,0x00,
+ 0x00,0x00, 0x00,0x00,
+ 0x00,0x00, 0x00,0x00
+};
+
+static void sendpacket(int sock, struct sockaddr *addr, socklen_t addr_len)
+{
+ struct timeval now;
+ int res;
+
+ res = sendto(sock, sync, sizeof(sync), 0,
+ addr, addr_len);
+ gettimeofday(&now, 0);
+ if (res < 0)
+ printf("%s: %s\n", "send", strerror(errno));
+ else
+ printf("%ld.%06ld: sent %d bytes\n",
+ (long)now.tv_sec, (long)now.tv_usec,
+ res);
+}
+
+static void recvpacket(int sock, int recvmsg_flags,
+ int siocgstamp, int siocgstampns)
+{
+ char data[256];
+ struct timeval now;
+ struct msghdr msg;
+ struct iovec entry;
+ struct sockaddr_in from_addr;
+ struct {
+ struct cmsghdr cm;
+ char control[512];
+ } control;
+ int res;
+
+ memset(&msg, 0, sizeof(msg));
+ msg.msg_iov = &entry;
+ msg.msg_iovlen = 1;
+ entry.iov_base = data;
+ entry.iov_len = sizeof(data);
+ msg.msg_name = (caddr_t)&from_addr;
+ msg.msg_namelen = sizeof(from_addr);
+ msg.msg_control = &control;
+ msg.msg_controllen = sizeof(control);
+
+ res = recvmsg(sock, &msg, recvmsg_flags|MSG_DONTWAIT);
+ gettimeofday(&now, 0);
+ if (res < 0) {
+ printf("%s %s: %s\n",
+ "recvmsg",
+ (recvmsg_flags & MSG_ERRQUEUE) ? "error" : "regular",
+ strerror(errno));
+ } else {
+ struct cmsghdr *cmsg;
+ struct timeval tv;
+ struct timespec ts;
+
+ printf("%ld.%06ld: received %s data, %d bytes from %s, %d bytes control messages\n",
+ (long)now.tv_sec, (long)now.tv_usec,
+ (recvmsg_flags & MSG_ERRQUEUE) ? "error" : "regular",
+ res,
+ inet_ntoa(from_addr.sin_addr),
+ msg.msg_controllen);
+ for (cmsg = CMSG_FIRSTHDR(&msg);
+ cmsg;
+ cmsg = CMSG_NXTHDR(&msg, cmsg)) {
+ printf(" cmsg len %d: ", cmsg->cmsg_len);
+ switch (cmsg->cmsg_level) {
+ case SOL_SOCKET:
+ printf("SOL_SOCKET ");
+ switch (cmsg->cmsg_type) {
+ case SO_TIMESTAMP: {
+ struct timeval *stamp =
+ (struct timeval *)CMSG_DATA(cmsg);
+ printf("SO_TIMESTAMP %ld.%06ld",
+ (long)stamp->tv_sec,
+ (long)stamp->tv_usec);
+ break;
+ }
+ case SO_TIMESTAMPNS: {
+ struct timespec *stamp =
+ (struct timespec *)CMSG_DATA(cmsg);
+ printf("SO_TIMESTAMPNS %ld.%09ld",
+ (long)stamp->tv_sec,
+ (long)stamp->tv_nsec);
+ break;
+ }
+ case SO_TIMESTAMPING: {
+ struct timespec *stamp =
+ (struct timespec *)CMSG_DATA(cmsg);
+ printf("SO_TIMESTAMPING ");
+ printf("SW %ld.%09ld ",
+ (long)stamp->tv_sec,
+ (long)stamp->tv_nsec);
+ stamp++;
+ printf("HW transformed %ld.%09ld ",
+ (long)stamp->tv_sec,
+ (long)stamp->tv_nsec);
+ stamp++;
+ printf("HW raw %ld.%09ld",
+ (long)stamp->tv_sec,
+ (long)stamp->tv_nsec);
+ break;
+ }
+ default:
+ printf("type %d", cmsg->cmsg_type);
+ break;
+ }
+ break;
+ case IPPROTO_IP:
+ printf("IPPROTO_IP ");
+ switch (cmsg->cmsg_type) {
+ case IP_RECVERR: {
+ struct sock_extended_err *err =
+ (struct sock_extended_err *)CMSG_DATA(cmsg);
+ printf("IP_RECVERR ee_errno '%s' ee_origin %d => %s",
+ strerror(err->ee_errno),
+ err->ee_origin,
+#ifdef SO_EE_ORIGIN_TIMESTAMPING
+ err->ee_origin == SO_EE_ORIGIN_TIMESTAMPING ?
+ "bounced packet" : "unexpected origin"
+#else
+ "probably SO_EE_ORIGIN_TIMESTAMPING"
+#endif
+ );
+ if (res < sizeof(sync))
+ printf(" => truncated data?!");
+ else if (!memcmp(sync, data + res - sizeof(sync),
+ sizeof(sync)))
+ printf(" => GOT OUR DATA BACK (HURRAY!)");
+ break;
+ }
+ case IP_PKTINFO: {
+ struct in_pktinfo *pktinfo =
+ (struct in_pktinfo *)CMSG_DATA(cmsg);
+ printf("IP_PKTINFO interface index %u",
+ pktinfo->ipi_ifindex);
+ break;
+ }
+ default:
+ printf("type %d", cmsg->cmsg_type);
+ break;
+ }
+ break;
+ default:
+ printf("level %d type %d",
+ cmsg->cmsg_level,
+ cmsg->cmsg_type);
+ break;
+ }
+ printf("\n");
+ }
+
+ if (siocgstamp) {
+ if (ioctl(sock, SIOCGSTAMP, &tv))
+ printf(" %s: %s\n", "SIOCGSTAMP", strerror(errno));
+ else
+ printf("SIOCGSTAMP %ld.%06ld\n",
+ (long)tv.tv_sec,
+ (long)tv.tv_usec);
+ }
+ if (siocgstampns) {
+ if (ioctl(sock, SIOCGSTAMPNS, &ts))
+ printf(" %s: %s\n", "SIOCGSTAMPNS", strerror(errno));
+ else
+ printf("SIOCGSTAMPNS %ld.%09ld\n",
+ (long)ts.tv_sec,
+ (long)ts.tv_nsec);
+ }
+ }
+}
+
+int main(int argc, char **argv)
+{
+ int so_timestamping_flags = 0;
+ int so_timestamp = 0;
+ int so_timestampns = 0;
+ int siocgstamp = 0;
+ int siocgstampns = 0;
+ int ip_multicast_loop = 0;
+ char *interface;
+ int i;
+ int enabled = 1;
+ int sock;
+ struct ifreq device;
+ struct ifreq hwtstamp;
+ struct hwtstamp_config hwconfig, hwconfig_requested;
+ struct sockaddr_in addr;
+ struct ip_mreq imr;
+ struct in_addr iaddr;
+ int val;
+ socklen_t len;
+ struct timeval next;
+
+ if (argc < 2)
+ usage(0);
+ interface = argv[1];
+
+ for (i = 2; i < argc; i++ ) {
+ if (!strcasecmp(argv[i], "SO_TIMESTAMP")) {
+ so_timestamp = 1;
+ } else if (!strcasecmp(argv[i], "SO_TIMESTAMPNS")) {
+ so_timestampns = 1;
+ } else if (!strcasecmp(argv[i], "SIOCGSTAMP")) {
+ siocgstamp = 1;
+ } else if (!strcasecmp(argv[i], "SIOCGSTAMPNS")) {
+ siocgstampns = 1;
+ } else if (!strcasecmp(argv[i], "IP_MULTICAST_LOOP")) {
+ ip_multicast_loop = 1;
+ } else if (!strcasecmp(argv[i], "SOF_TIMESTAMPING_TX_HARDWARE")) {
+ so_timestamping_flags |= SOF_TIMESTAMPING_TX_HARDWARE;
+ } else if (!strcasecmp(argv[i], "SOF_TIMESTAMPING_TX_SOFTWARE")) {
+ so_timestamping_flags |= SOF_TIMESTAMPING_TX_SOFTWARE;
+ } else if (!strcasecmp(argv[i], "SOF_TIMESTAMPING_RX_HARDWARE")) {
+ so_timestamping_flags |= SOF_TIMESTAMPING_RX_HARDWARE;
+ } else if (!strcasecmp(argv[i], "SOF_TIMESTAMPING_RX_SOFTWARE")) {
+ so_timestamping_flags |= SOF_TIMESTAMPING_RX_SOFTWARE;
+ } else if (!strcasecmp(argv[i], "SOF_TIMESTAMPING_SOFTWARE")) {
+ so_timestamping_flags |= SOF_TIMESTAMPING_SOFTWARE;
+ } else if (!strcasecmp(argv[i], "SOF_TIMESTAMPING_SYS_HARDWARE")) {
+ so_timestamping_flags |= SOF_TIMESTAMPING_SYS_HARDWARE;
+ } else if (!strcasecmp(argv[i], "SOF_TIMESTAMPING_RAW_HARDWARE")) {
+ so_timestamping_flags |= SOF_TIMESTAMPING_RAW_HARDWARE;
+ } else {
+ usage(argv[i]);
+ }
+ }
+
+ sock = socket(PF_INET, SOCK_DGRAM, IPPROTO_UDP);
+ if (socket < 0)
+ bail("socket");
+
+ memset(&device, 0, sizeof(device));
+ strncpy(device.ifr_name, interface, sizeof(device.ifr_name));
+ if (ioctl(sock, SIOCGIFADDR, &device) < 0)
+ bail("getting interface IP address");
+
+ memset(&hwtstamp, 0, sizeof(hwtstamp));
+ strncpy(hwtstamp.ifr_name, interface, sizeof(hwtstamp.ifr_name));
+ hwtstamp.ifr_data = (void *)&hwconfig;
+ memset(&hwconfig, 0, sizeof(&hwconfig));
+ hwconfig.tx_type =
+ (so_timestamping_flags & SOF_TIMESTAMPING_TX_HARDWARE) ?
+ HWTSTAMP_TX_ON : HWTSTAMP_TX_OFF;
+ hwconfig.rx_filter =
+ (so_timestamping_flags & SOF_TIMESTAMPING_RX_HARDWARE) ?
+ HWTSTAMP_FILTER_PTP_V1_L4_SYNC : HWTSTAMP_FILTER_NONE;
+ hwconfig_requested = hwconfig;
+ if (ioctl(sock, SIOCSHWTSTAMP, &hwtstamp) < 0) {
+ if ((errno == EINVAL || errno == ENOTSUP) &&
+ hwconfig_requested.tx_type == HWTSTAMP_TX_OFF &&
+ hwconfig_requested.rx_filter == HWTSTAMP_FILTER_NONE)
+ printf("SIOCSHWTSTAMP: disabling hardware time stamping not possible\n");
+ else
+ bail("SIOCSHWTSTAMP");
+ }
+ printf("SIOCSHWTSTAMP: tx_type %d requested, got %d; rx_filter %d requested, got %d\n",
+ hwconfig_requested.tx_type, hwconfig.tx_type,
+ hwconfig_requested.rx_filter, hwconfig.rx_filter);
+
+ /* bind to PTP port */
+ addr.sin_family = AF_INET;
+ addr.sin_addr.s_addr = htonl(INADDR_ANY);
+ addr.sin_port = htons(319 /* PTP event port */);
+ if (bind(sock, (struct sockaddr*)&addr, sizeof(struct sockaddr_in)) < 0)
+ bail("bind");
+
+ /* set multicast group for outgoing packets */
+ inet_aton("224.0.1.130", &iaddr); /* alternate PTP domain 1 */
+ addr.sin_addr = iaddr;
+ imr.imr_multiaddr.s_addr = iaddr.s_addr;
+ imr.imr_interface.s_addr = ((struct sockaddr_in *)&device.ifr_addr)->sin_addr.s_addr;
+ if (setsockopt(sock, IPPROTO_IP, IP_MULTICAST_IF,
+ &imr.imr_interface.s_addr, sizeof(struct in_addr)) < 0)
+ bail("set multicast");
+
+ /* join multicast group, loop our own packet */
+ if (setsockopt(sock, IPPROTO_IP, IP_ADD_MEMBERSHIP, &imr, sizeof(struct ip_mreq)) < 0)
+ bail("join multicast group");
+
+ if (setsockopt(sock, IPPROTO_IP, IP_MULTICAST_LOOP, &ip_multicast_loop, sizeof(enabled)) < 0) {
+ bail("loop multicast");
+ }
+
+ /* set socket options for time stamping */
+ if (so_timestamp &&
+ setsockopt(sock, SOL_SOCKET, SO_TIMESTAMP, &enabled, sizeof(enabled)) < 0)
+ bail("setsockopt SO_TIMESTAMP");
+
+ if (so_timestampns &&
+ setsockopt(sock, SOL_SOCKET, SO_TIMESTAMPNS, &enabled, sizeof(enabled)) < 0)
+ bail("setsockopt SO_TIMESTAMPNS");
+
+ if (so_timestamping_flags &&
+ setsockopt(sock, SOL_SOCKET, SO_TIMESTAMPING, &so_timestamping_flags, sizeof(so_timestamping_flags)) < 0)
+ bail("setsockopt SO_TIMESTAMPING");
+
+ /* request IP_PKTINFO for debugging purposes */
+ if (setsockopt(sock, SOL_IP, IP_PKTINFO, &enabled, sizeof(enabled)) < 0)
+ printf("%s: %s\n", "setsockopt IP_PKTINFO", strerror(errno));
+
+ /* verify socket options */
+ len = sizeof(val);
+ if (getsockopt(sock, SOL_SOCKET, SO_TIMESTAMP, &val, &len) < 0)
+ printf("%s: %s\n", "getsockopt SO_TIMESTAMP", strerror(errno));
+ else
+ printf("SO_TIMESTAMP %d\n", val);
+
+ if (getsockopt(sock, SOL_SOCKET, SO_TIMESTAMPNS, &val, &len) < 0)
+ printf("%s: %s\n", "getsockopt SO_TIMESTAMPNS", strerror(errno));
+ else
+ printf("SO_TIMESTAMPNS %d\n", val);
+
+ if (getsockopt(sock, SOL_SOCKET, SO_TIMESTAMPING, &val, &len) < 0) {
+ printf("%s: %s\n", "getsockopt SO_TIMESTAMPING", strerror(errno));
+ } else {
+ printf("SO_TIMESTAMPING %d\n", val);
+ if (val != so_timestamping_flags)
+ printf(" not the expected value %d\n", so_timestamping_flags);
+ }
+
+ /* send packets forever every five seconds */
+ gettimeofday(&next, 0);
+ next.tv_sec = (next.tv_sec + 1) / 5 * 5;
+ next.tv_usec = 0;
+ while(1) {
+ struct timeval now;
+ struct timeval delta;
+ long delta_us;
+ int res;
+ fd_set readfs, errorfs;
+
+ gettimeofday(&now, 0);
+ delta_us = (long)(next.tv_sec - now.tv_sec) * 1000000 +
+ (long)(next.tv_usec - now.tv_usec);
+ if (delta_us > 0) {
+ /* continue waiting for timeout or data */
+ delta.tv_sec = delta_us / 1000000;
+ delta.tv_usec = delta_us % 1000000;
+
+ FD_ZERO(&readfs);
+ FD_ZERO(&errorfs);
+ FD_SET(sock, &readfs);
+ FD_SET(sock, &errorfs);
+ printf("%ld.%06ld: select %ldus\n",
+ (long)now.tv_sec, (long)now.tv_usec,
+ delta_us);
+ res = select(sock + 1, &readfs, 0, &errorfs, &delta);
+ gettimeofday(&now, 0);
+ printf("%ld.%06ld: select returned: %d, %s\n",
+ (long)now.tv_sec, (long)now.tv_usec,
+ res,
+ res < 0 ? strerror(errno) : "success");
+ if (res > 0) {
+ if (FD_ISSET(sock, &readfs))
+ printf("ready for reading\n");
+ if (FD_ISSET(sock, &errorfs))
+ printf("has error\n");
+ recvpacket(sock, 0,
+ siocgstamp,
+ siocgstampns);
+ recvpacket(sock, MSG_ERRQUEUE,
+ siocgstamp,
+ siocgstampns);
+ }
+ } else {
+ /* write one packet */
+ sendpacket(sock, (struct sockaddr *)&addr, sizeof(addr));
+ next.tv_sec += 5;
+ continue;
+ }
+ }
+
+ return 0;
+}
@@ -54,4 +54,7 @@
#define SO_MARK 36
+#define SO_TIMESTAMPING 37
+#define SCM_TIMESTAMPING SO_TIMESTAMPING
+
#endif /* _ASM_X86_SOCKET_H */
@@ -16,6 +16,7 @@ struct sock_extended_err
#define SO_EE_ORIGIN_LOCAL 1
#define SO_EE_ORIGIN_ICMP 2
#define SO_EE_ORIGIN_ICMP6 3
+#define SO_EE_ORIGIN_TIMESTAMPING 4
#define SO_EE_OFFENDER(ee) ((struct sockaddr*)((ee)+1))
new file mode 100644
@@ -0,0 +1,104 @@
+#ifndef _NET_TIMESTAMPING_H
+#define _NET_TIMESTAMPING_H
+
+#include <linux/socket.h> /* for SO_TIMESTAMPING */
+
+/*
+ * user space linux/socket.h might not have these defines yet:
+ * provide fallback
+ */
+#if !defined(__KERNEL__) && !defined(SO_TIMESTAMPING)
+# define SO_TIMESTAMPING 37
+# define SCM_TIMESTAMPING SO_TIMESTAMPING
+#endif
+
+/* SO_TIMESTAMPING gets an integer bit field comprised of these values */
+enum {
+ SOF_TIMESTAMPING_TX_HARDWARE = (1<<0),
+ SOF_TIMESTAMPING_TX_SOFTWARE = (1<<1),
+ SOF_TIMESTAMPING_RX_HARDWARE = (1<<2),
+ SOF_TIMESTAMPING_RX_SOFTWARE = (1<<3),
+ SOF_TIMESTAMPING_SOFTWARE = (1<<4),
+ SOF_TIMESTAMPING_SYS_HARDWARE = (1<<5),
+ SOF_TIMESTAMPING_RAW_HARDWARE = (1<<6),
+ SOF_TIMESTAMPING_MASK = (SOF_TIMESTAMPING_RAW_HARDWARE - 1) | SOF_TIMESTAMPING_RAW_HARDWARE
+};
+
+#if !defined(__KERNEL__) && !defined(SIOCSHWTSTAMP)
+# define SIOCSHWTSTAMP 0x89b0
+#endif
+
+/**
+ * struct hwtstamp_config - %SIOCSHWTSTAMP parameter
+ *
+ * @flags: no flags defined right now, must be zero
+ * @tx_type: one of HWTSTAMP_TX_*
+ * @rx_type: one of one of HWTSTAMP_FILTER_*
+ *
+ * %SIOCSHWTSTAMP expects a &struct ifreq with a ifr_data pointer
+ * to this structure.
+ */
+struct hwtstamp_config {
+ int flags;
+ int tx_type;
+ int rx_filter;
+};
+
+/* possible values for hwtstamp_config->tx_type */
+enum {
+ /*
+ * No outgoing packet will need hardware time stamping;
+ * should a packet arrive which asks for it, no hardware
+ * time stamping will be done.
+ */
+ HWTSTAMP_TX_OFF,
+
+ /*
+ * Enables hardware time stamping for outgoing packets;
+ * the sender of the packet decides which are to be
+ * time stamped by setting %SOF_TIMESTAMPING_TX_SOFTWARE
+ * before sending the packet.
+ */
+ HWTSTAMP_TX_ON,
+};
+
+/* possible values for hwtstamp_config->rx_filter */
+enum {
+ /* time stamp no incoming packet at all */
+ HWTSTAMP_FILTER_NONE,
+
+ /* time stamp any incoming packet */
+ HWTSTAMP_FILTER_ALL,
+
+ /* return value: time stamp all packets requested plus some others */
+ HWTSTAMP_FILTER_SOME,
+
+ /* PTP v1, UDP, any kind of event packet */
+ HWTSTAMP_FILTER_PTP_V1_L4_EVENT,
+ /* PTP v1, UDP, Sync packet */
+ HWTSTAMP_FILTER_PTP_V1_L4_SYNC,
+ /* PTP v1, UDP, Delay_req packet */
+ HWTSTAMP_FILTER_PTP_V1_L4_DELAY_REQ,
+ /* PTP v2, UDP, any kind of event packet */
+ HWTSTAMP_FILTER_PTP_V2_L4_EVENT,
+ /* PTP v2, UDP, Sync packet */
+ HWTSTAMP_FILTER_PTP_V2_L4_SYNC,
+ /* PTP v2, UDP, Delay_req packet */
+ HWTSTAMP_FILTER_PTP_V2_L4_DELAY_REQ,
+
+ /* 802.AS1, Ethernet, any kind of event packet */
+ HWTSTAMP_FILTER_PTP_V2_L2_EVENT,
+ /* 802.AS1, Ethernet, Sync packet */
+ HWTSTAMP_FILTER_PTP_V2_L2_SYNC,
+ /* 802.AS1, Ethernet, Delay_req packet */
+ HWTSTAMP_FILTER_PTP_V2_L2_DELAY_REQ,
+
+ /* PTP v2/802.AS1, any layer, any kind of event packet */
+ HWTSTAMP_FILTER_PTP_V2_EVENT,
+ /* PTP v2/802.AS1, any layer, Sync packet */
+ HWTSTAMP_FILTER_PTP_V2_SYNC,
+ /* PTP v2/802.AS1, any layer, Delay_req packet */
+ HWTSTAMP_FILTER_PTP_V2_DELAY_REQ,
+};
+
+#endif /* _NET_TIMESTAMPING_H */
@@ -122,6 +122,9 @@
#define SIOCBRADDIF 0x89a2 /* add interface to bridge */
#define SIOCBRDELIF 0x89a3 /* remove interface from bridge */
+/* hardware time stamping: parameters in linux/net_tstamp.h */
+#define SIOCSHWTSTAMP 0x89b0
+
/* Device private ioctl calls */
/*
User space can request hardware and/or software time stamping. Reporting of the result(s) via a new control message is enabled separately for each field in the message because some of the fields may require additional computation and thus cause overhead. User space can tell the different kinds of time stamps apart and choose what suits its needs. When a TX timestamp operation is requested, the TX skb will be cloned and the clone will be time stamped (in hardware or software) and added to the socket error queue of the skb, if the skb has a socket associated with it. The actual TX timestamp will reach userspace as a RX timestamp on the cloned packet. If timestamping is requested and no timestamping is done in the device driver (potentially this may use hardware timestamping), it will be done in software after the device's start_hard_xmit routine. TODO: add SO_TIMESTAMPING define also to other platforms Signed-off-by: Patrick Ohly <patrick.ohly@intel.com> --- Documentation/networking/timestamping.txt | 178 ++++++++ Documentation/networking/timestamping/.gitignore | 1 + Documentation/networking/timestamping/Makefile | 3 + .../networking/timestamping/timestamping.c | 469 ++++++++++++++++++++ arch/x86/include/asm/socket.h | 3 + include/linux/errqueue.h | 1 + include/linux/net_tstamp.h | 104 +++++ include/linux/sockios.h | 3 + 8 files changed, 762 insertions(+), 0 deletions(-) create mode 100644 Documentation/networking/timestamping.txt create mode 100644 Documentation/networking/timestamping/.gitignore create mode 100644 Documentation/networking/timestamping/Makefile create mode 100644 Documentation/networking/timestamping/timestamping.c create mode 100644 include/linux/net_tstamp.h