ptp过滤器
新设备使用ethtool -T显示ptp过滤器信息：
linux_cx7110:~# ethtool -T eth0
Time stamping parameters for eth0:
Capabilities:hardware-transmit (SOF_TIMESTAMPING_TX_HARDWARE)software-transmit (SOF_TIMESTAMPING_TX_SOFTWARE)hardware-receive (SOF_TIMESTAMPING_RX_HARDWARE)software-receive (SOF_TIMESTAMPING_RX_SOFTWARE)software-system-clock (SOF_TIMESTAMPING_SOFTWARE)hardware-raw-clock (SOF_TIMESTAMPING_RAW_HARDWARE)
PTP Hardware Clock: 0
Hardware Transmit Timestamp Modes:off (HWTSTAMP_TX_OFF)on (HWTSTAMP_TX_ON)
Hardware Receive Filter Modes:none (HWTSTAMP_FILTER_NONE)all (HWTSTAMP_FILTER_ALL)ptpv1-l4-event (HWTSTAMP_FILTER_PTP_V1_L4_EVENT)ptpv1-l4-sync (HWTSTAMP_FILTER_PTP_V1_L4_SYNC)ptpv1-l4-delay-req (HWTSTAMP_FILTER_PTP_V1_L4_DELAY_REQ)ptpv2-l4-event (HWTSTAMP_FILTER_PTP_V2_L4_EVENT)ptpv2-l4-sync (HWTSTAMP_FILTER_PTP_V2_L4_SYNC)ptpv2-l4-delay-req (HWTSTAMP_FILTER_PTP_V2_L4_DELAY_REQ)ptpv2-event (HWTSTAMP_FILTER_PTP_V2_EVENT)ptpv2-sync (HWTSTAMP_FILTER_PTP_V2_SYNC)ptpv2-delay-req (HWTSTAMP_FILTER_PTP_V2_DELAY_REQ)原来设备没有ptp过滤器信息：
root@imx6qsabresd_genvict:~# ethtool -T eth0
Time stamping parameters for eth0:
Capabilities:hardware-transmit (SOF_TIMESTAMPING_TX_HARDWARE)software-transmit (SOF_TIMESTAMPING_TX_SOFTWARE)hardware-receive (SOF_TIMESTAMPING_RX_HARDWARE)software-receive (SOF_TIMESTAMPING_RX_SOFTWARE)software-system-clock (SOF_TIMESTAMPING_SOFTWARE)hardware-raw-clock (SOF_TIMESTAMPING_RAW_HARDWARE)
PTP Hardware Clock: 0
Hardware Transmit Timestamp Modes:off (HWTSTAMP_TX_OFF)on (HWTSTAMP_TX_ON)
Hardware Receive Filter Modes:none (HWTSTAMP_FILTER_NONE)all (HWTSTAMP_FILTER_ALL)linux_cx7101:~# ethtool -T eth0
Time stamping parameters for eth0:
Capabilities:software-receive (SOF_TIMESTAMPING_RX_SOFTWARE)software-system-clock (SOF_TIMESTAMPING_SOFTWARE)
PTP Hardware Clock: none
Hardware Transmit Timestamp Modes: none
Hardware Receive Filter Modes: none代码流程
ethtool-4.15，最后系统调用：ioctl(ctx->fd, SIOCETHTOOL, &ctx->ifr);
{ "-T|--show-time-stamping", 1, do_tsinfo,
do_tsinfo#define ETHTOOL_GET_TS_INFO 0x00000041 /* Get time stamping and PHC info */fprintf(stdout, "Time stamping parameters for %s:\n", ctx->devname);info.cmd = ETHTOOL_GET_TS_INFO;if (send_ioctl(ctx, &info)) {perror("Cannot get device time stamping settings");return -1;}dump_tsinfo(&info);#define SIOCETHTOOL 0x8946
int send_ioctl(struct cmd_context *ctx, void *cmd)
{ctx->ifr.ifr_data = cmd;return ioctl(ctx->fd, SIOCETHTOOL, &ctx->ifr);
}static char *rx_filter_labels[N_RX_FILTERS] = {"none (HWTSTAMP_FILTER_NONE)","all (HWTSTAMP_FILTER_ALL)","some (HWTSTAMP_FILTER_SOME)","ptpv1-l4-event (HWTSTAMP_FILTER_PTP_V1_L4_EVENT)","ptpv1-l4-sync (HWTSTAMP_FILTER_PTP_V1_L4_SYNC)","ptpv1-l4-delay-req (HWTSTAMP_FILTER_PTP_V1_L4_DELAY_REQ)","ptpv2-l4-event (HWTSTAMP_FILTER_PTP_V2_L4_EVENT)","ptpv2-l4-sync (HWTSTAMP_FILTER_PTP_V2_L4_SYNC)","ptpv2-l4-delay-req (HWTSTAMP_FILTER_PTP_V2_L4_DELAY_REQ)","ptpv2-l2-event (HWTSTAMP_FILTER_PTP_V2_L2_EVENT)","ptpv2-l2-sync (HWTSTAMP_FILTER_PTP_V2_L2_SYNC)","ptpv2-l2-delay-req (HWTSTAMP_FILTER_PTP_V2_L2_DELAY_REQ)","ptpv2-event (HWTSTAMP_FILTER_PTP_V2_EVENT)","ptpv2-sync (HWTSTAMP_FILTER_PTP_V2_SYNC)","ptpv2-delay-req (HWTSTAMP_FILTER_PTP_V2_DELAY_REQ)","ntp-all (HWTSTAMP_FILTER_NTP_ALL)",
};dump_tsinfofprintf(stdout, "Hardware Receive Filter Modes:");if (!info->rx_filters)fprintf(stdout, " none\n");elsefprintf(stdout, "\n");for (i = 0; i < N_RX_FILTERS; i++) {if (info->rx_filters & (1 << i))fprintf(stdout, "\t%s\n", rx_filter_labels[i]);}
网络驱动，调用网络通用层代码框架，最后调用设备驱动：get_ts_info
net/core/dev_ioctl.c +420
dev_ioctl(struct net *net, unsigned int cmd, struct ifreq *ifr, bool *need_copyout)case SIOCETHTOOL:dev_load(net, ifr->ifr_name);rtnl_lock();ret = dev_ethtool(net, ifr);rtnl_unlock();if (colon)*colon = ':';return ret;dev_ethtool(struct net *net, struct ifreq *ifr)struct net_device *dev = __dev_get_by_name(net, ifr->ifr_name);void __user *useraddr = ifr->ifr_data;【ETHTOOL_GET_TS_INFO】case ETHTOOL_GET_TS_INFO:rc = ethtool_get_ts_info(dev, useraddr);break;static int ethtool_get_ts_info(struct net_device *dev, void __user *useraddr)
{int err = 0;struct ethtool_ts_info info;const struct ethtool_ops *ops = dev->ethtool_ops;struct phy_device *phydev = dev->phydev;memset(&info, 0, sizeof(info));info.cmd = ETHTOOL_GET_TS_INFO;if (phydev && phydev->drv && phydev->drv->ts_info) {err = phydev->drv->ts_info(phydev, &info);} else if (ops->get_ts_info) {err = ops->get_ts_info(dev, &info);} else {info.so_timestamping =SOF_TIMESTAMPING_RX_SOFTWARE |SOF_TIMESTAMPING_SOFTWARE;info.phc_index = -1;}if (err)return err;if (copy_to_user(useraddr, &info, sizeof(info)))err = -EFAULT;return err;
}设备驱动，设备驱动如果支持time_stamp，就直接返回全部ptp过滤器信息，没有读取寄存器信息。
drivers/net/ethernet/stmicro/stmmac/stmmac_ethtool.c
static const struct ethtool_ops stmmac_ethtool_ops = {.get_ts_info = stmmac_get_ts_info,static int stmmac_get_ts_info(struct net_device *dev,struct ethtool_ts_info *info)
{ struct stmmac_priv *priv = netdev_priv(dev);if ((priv->dma_cap.time_stamp || priv->dma_cap.atime_stamp)) {info->so_timestamping = SOF_TIMESTAMPING_TX_SOFTWARE |SOF_TIMESTAMPING_TX_HARDWARE |SOF_TIMESTAMPING_RX_SOFTWARE |SOF_TIMESTAMPING_RX_HARDWARE |SOF_TIMESTAMPING_SOFTWARE |SOF_TIMESTAMPING_RAW_HARDWARE;if (priv->ptp_clock)info->phc_index = ptp_clock_index(priv->ptp_clock);info->tx_types = (1 << HWTSTAMP_TX_OFF) | (1 << HWTSTAMP_TX_ON);info->rx_filters = ((1 << HWTSTAMP_FILTER_NONE) |(1 << HWTSTAMP_FILTER_PTP_V1_L4_EVENT) |【ethtool -T eth0执行这里获取信息】(1 << HWTSTAMP_FILTER_PTP_V1_L4_SYNC) |(1 << HWTSTAMP_FILTER_PTP_V1_L4_DELAY_REQ) |(1 << HWTSTAMP_FILTER_PTP_V2_L4_EVENT) |(1 << HWTSTAMP_FILTER_PTP_V2_L4_SYNC) |(1 << HWTSTAMP_FILTER_PTP_V2_L4_DELAY_REQ) |(1 << HWTSTAMP_FILTER_PTP_V2_EVENT) |(1 << HWTSTAMP_FILTER_PTP_V2_SYNC) |(1 << HWTSTAMP_FILTER_PTP_V2_DELAY_REQ) |(1 << HWTSTAMP_FILTER_ALL));return 0;} elsereturn ethtool_op_get_ts_info(dev, info);
}设备驱动支持设置ptp过滤器，但ethtool工具暂不支持：
static int stmmac_hwtstamp_ioctl(struct net_device *dev, struct ifreq *ifr)if (priv->adv_ts) {switch (config.rx_filter) {case HWTSTAMP_FILTER_NONE:/* time stamp no incoming packet at all */config.rx_filter = HWTSTAMP_FILTER_NONE;break;case HWTSTAMP_FILTER_PTP_V1_L4_EVENT:【没有代码设置属性】/* PTP v1, UDP, any kind of event packet */config.rx_filter = HWTSTAMP_FILTER_PTP_V1_L4_EVENT;/* take time stamp for all event messages */if (xmac)snap_type_sel = PTP_GMAC4_TCR_SNAPTYPSEL_1;elsesnap_type_sel = PTP_TCR_SNAPTYPSEL_1;ptp_over_ipv4_udp = PTP_TCR_TSIPV4ENA;ptp_over_ipv6_udp = PTP_TCR_TSIPV6ENA;break;static int stmmac_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)case SIOCSHWTSTAMP:ret = stmmac_hwtstamp_ioctl(dev, rq);static const struct net_device_ops stmmac_netdev_ops = {.ndo_do_ioctl = stmmac_ioctl,net/core/dev_ioctl.c
int dev_ioctl(struct net *net, unsigned int cmd, struct ifreq *ifr, bool *need_copyout)case SIOCSIFNAME:dev_load(net, ifr->ifr_name);if (!ns_capable(net->user_ns, CAP_NET_ADMIN))return -EPERM;rtnl_lock();ret = dev_ifsioc(net, ifr, cmd);dev_ifsioccmd == SIOCSHWTSTAMP ||cmd == SIOCGHWTSTAMP ||cmd == SIOCWANDEV) {err = -EOPNOTSUPP;if (ops->ndo_do_ioctl) {if (netif_device_present(dev))err = ops->ndo_do_ioctl(dev, ifr, cmd);
总结
目前看ptp过滤器没有实际用到（暂不知如何使用），ptpd2工具发送的udp组播包也是能全部收到的。设备收到192.168.8.202主模式发送的udp包：
linux_genvict:~# tcpdump -i eth0
[10124.286185] {3}[20512:tcpdump]stmmac_get_ts_info,811,
[10124.288759] {3}[20512:tcpdump]stmmac_get_ts_info,826,
[10124.295198] {3}[20512:tcpdump]device eth0 entered promiscuous mode
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on eth0, link-type EN10MB (Ethernet), capture size 262144 bytes
14:21:02.767206 IP 192.168.8.202.319 > 224.0.1.129.319: UDP, length 44
14:21:02.767279 IP 192.168.8.202.320 > 224.0.1.129.320: UDP, length 44
14:21:03.767224 IP 192.168.8.202.320 > 224.0.1.129.320: UDP, length 64
14:21:03.767297 IP 192.168.8.202.319 > 224.0.1.129.319: UDP, length 44
14:21:03.767323 IP 192.168.8.202.320 > 224.0.1.129.320: UDP, length 44
14:21:04.767240 IP 192.168.8.202.319 > 224.0.1.129.319: UDP, length 44
14:21:04.767313 IP 192.168.8.202.320 > 224.0.1.129.320: UDP, length 44
14:21:05.767137 IP 192.168.8.202.320 > 224.0.1.129.320: UDP, length 64
14:21:05.767221 IP 192.168.8.202.319 > 224.0.1.129.319: UDP, length 44
14:21:05.767251 IP 192.168.8.202.320 > 224.0.1.129.320: UDP, length 44
14:21:06.767151 IP 192.168.8.202.319 > 224.0.1.129.319: UDP, length 44
14:21:06.767239 IP 192.168.8.202.320 > 224.0.1.129.320: UDP, length 44
14:21:07.767173 IP 192.168.8.202.320 > 224.0.1.129.320: UDP, length 64
14:21:07.767265 IP 192.168.8.202.319 > 224.0.1.129.319: UDP, length 44
14:21:07.767290 IP 192.168.8.202.320 > 224.0.1.129.320: UDP, length 44
设备收到192.168.8.202从模式发送igmp包，
linux_genvict:~# tcpdump -i eth0
[10209.040651] {2}[22941:tcpdump]stmmac_get_ts_info,811,
[10209.043257] {2}[22941:tcpdump]stmmac_get_ts_info,826,
[10209.050286] {2}[22941:tcpdump]device eth0 entered promiscuous mode
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on eth0, link-type EN10MB (Ethernet), capture size 262144 bytes
14:22:27.397521 IP 192.168.8.202 > 224.0.0.22: igmp v3 report, 2 group record(s)
14:22:36.297523 IP 192.168.8.202 > 224.0.0.22: igmp v3 report, 2 group record(s)
14:22:36.397373 IP 192.168.8.202 > 224.0.0.22: igmp v3 report, 2 group record(s)
14:22:44.767547 IP 192.168.8.202 > 224.0.0.22: igmp v3 report, 2 group record(s)
