1 files changed, 126 insertions, 0 deletions

diff --git a/net/core/timestamping.c b/net/core/timestamping.c
new file mode 100644
index 000000000000..0ae6c22da85b
--- /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)));
+}