5 files changed, 144 insertions, 1 deletions

diff --git a/net/Kconfig b/net/Kconfig
index 0d68b40fc0e..b3250944cde 100644
--- a/net/Kconfig
+++ b/net/Kconfig
@@ -86,6 +86,16 @@ config NETWORK_SECMARK
           to nfmark, but designated for security purposes.
           If you are unsure how to answer this question, answer N.
 
+config NETWORK_PHY_TIMESTAMPING
+        bool "Timestamping in PHY devices"
+        depends on EXPERIMENTAL
+        help
+          This allows timestamping of network packets by PHYs with
+          hardware timestamping capabilities. This option adds some
+          overhead in the transmit and receive paths.
+
+          If you are unsure how to answer this question, answer N.
+
 menuconfig NETFILTER
         bool "Network packet filtering framework (Netfilter)"
         ---help---
diff --git a/net/core/Makefile b/net/core/Makefile
index 51c3eec850e..8a04dd22cf7 100644
--- a/net/core/Makefile
+++ b/net/core/Makefile
@@ -18,4 +18,4 @@ obj-$(CONFIG_NET_DMA) += user_dma.o
 obj-$(CONFIG_FIB_RULES) += fib_rules.o
 obj-$(CONFIG_TRACEPOINTS) += net-traces.o
 obj-$(CONFIG_NET_DROP_MONITOR) += drop_monitor.o
-
+obj-$(CONFIG_NETWORK_PHY_TIMESTAMPING) += timestamping.o
diff --git a/net/core/dev.c b/net/core/dev.c
index e2b9fa2c917..1c002c7ef5d 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -2957,6 +2957,9 @@ int netif_receive_skb(struct sk_buff *skb)
         if (netdev_tstamp_prequeue)
                 net_timestamp_check(skb);
 
+        if (skb_defer_rx_timestamp(skb))
+                return NET_RX_SUCCESS;
+
 #ifdef CONFIG_RPS
         {
                 struct rps_dev_flow voidflow, *rflow = &voidflow;
diff --git a/net/core/timestamping.c b/net/core/timestamping.c
new file mode 100644
index 00000000000..0ae6c22da85
--- /dev/null
+++ b/net/core/timestamping.c
@@ -0,0 +1,126 @@
+/*
+ * PTP 1588 clock support - support for timestamping in PHY devices
+ *
+ * Copyright (C) 2010 OMICRON electronics GmbH
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; if not, write to the Free Software
+ *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+#include <linux/errqueue.h>
+#include <linux/phy.h>
+#include <linux/ptp_classify.h>
+#include <linux/skbuff.h>
+
+static struct sock_filter ptp_filter[] = {
+        PTP_FILTER
+};
+
+static unsigned int classify(struct sk_buff *skb)
+{
+        if (likely(skb->dev &&
+                   skb->dev->phydev &&
+                   skb->dev->phydev->drv))
+                return sk_run_filter(skb, ptp_filter, ARRAY_SIZE(ptp_filter));
+        else
+                return PTP_CLASS_NONE;
+}
+
+void skb_clone_tx_timestamp(struct sk_buff *skb)
+{
+        struct phy_device *phydev;
+        struct sk_buff *clone;
+        struct sock *sk = skb->sk;
+        unsigned int type;
+
+        if (!sk)
+                return;
+
+        type = classify(skb);
+
+        switch (type) {
+        case PTP_CLASS_V1_IPV4:
+        case PTP_CLASS_V1_IPV6:
+        case PTP_CLASS_V2_IPV4:
+        case PTP_CLASS_V2_IPV6:
+        case PTP_CLASS_V2_L2:
+        case PTP_CLASS_V2_VLAN:
+                phydev = skb->dev->phydev;
+                if (likely(phydev->drv->txtstamp)) {
+                        clone = skb_clone(skb, GFP_ATOMIC);
+                        if (!clone)
+                                return;
+                        clone->sk = sk;
+                        phydev->drv->txtstamp(phydev, clone, type);
+                }
+                break;
+        default:
+                break;
+        }
+}
+
+void skb_complete_tx_timestamp(struct sk_buff *skb,
+                               struct skb_shared_hwtstamps *hwtstamps)
+{
+        struct sock *sk = skb->sk;
+        struct sock_exterr_skb *serr;
+        int err;
+
+        if (!hwtstamps)
+                return;
+
+        *skb_hwtstamps(skb) = *hwtstamps;
+        serr = SKB_EXT_ERR(skb);
+        memset(serr, 0, sizeof(*serr));
+        serr->ee.ee_errno = ENOMSG;
+        serr->ee.ee_origin = SO_EE_ORIGIN_TIMESTAMPING;
+        skb->sk = NULL;
+        err = sock_queue_err_skb(sk, skb);
+        if (err)
+                kfree_skb(skb);
+}
+EXPORT_SYMBOL_GPL(skb_complete_tx_timestamp);
+
+bool skb_defer_rx_timestamp(struct sk_buff *skb)
+{
+        struct phy_device *phydev;
+        unsigned int type;
+
+        skb_push(skb, ETH_HLEN);
+
+        type = classify(skb);
+
+        skb_pull(skb, ETH_HLEN);
+
+        switch (type) {
+        case PTP_CLASS_V1_IPV4:
+        case PTP_CLASS_V1_IPV6:
+        case PTP_CLASS_V2_IPV4:
+        case PTP_CLASS_V2_IPV6:
+        case PTP_CLASS_V2_L2:
+        case PTP_CLASS_V2_VLAN:
+                phydev = skb->dev->phydev;
+                if (likely(phydev->drv->rxtstamp))
+                        return phydev->drv->rxtstamp(phydev, skb, type);
+                break;
+        default:
+                break;
+        }
+
+        return false;
+}
+
+void __init skb_timestamping_init(void)
+{
+        BUG_ON(sk_chk_filter(ptp_filter, ARRAY_SIZE(ptp_filter)));
+}
diff --git a/net/socket.c b/net/socket.c
index 6fe484122a4..2270b941bcc 100644
--- a/net/socket.c
+++ b/net/socket.c
@@ -2394,6 +2394,10 @@ static int __init sock_init(void)
         netfilter_init();
 #endif
 
+#ifdef CONFIG_NETWORK_PHY_TIMESTAMPING
+        skb_timestamping_init();
+#endif
+
         return 0;
 }