netdev - [PATCH V2 02/11] net: introduce time stamping wrapper for netif

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Message-Id: <34a4527448b3a36c88d0c1c3cb9ad8661e693d7a.1307719258.git.richard.cochran@omicron.at>
Date:	Fri, 10 Jun 2011 17:24:48 +0200
From:	Richard Cochran <richardcochran@...il.com>
To:	<netdev@...r.kernel.org>
Cc:	David Miller <davem@...emloft.net>
Subject: [PATCH V2 02/11] net: introduce time stamping wrapper for netif_rx.

This commit adds a variation on netif_rx() designed to allow non-NAPI
Ethernet MAC drivers to support hardware time stamping in PHY devices.
Adapting a given driver requires two small changes, namely replacing
netif_rx() with netif_rx_defer() and adding a call to skb_tx_timestamp()
in the transmission path.

Signed-off-by: Richard Cochran <richard.cochran@...cron.at>
---
 include/linux/netdevice.h |   21 +++++++++++++++++++++
 1 files changed, 21 insertions(+), 0 deletions(-)

diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index ca333e7..9a56505 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -2066,6 +2066,27 @@ extern void dev_kfree_skb_any(struct sk_buff *skb);
 #define HAVE_NETIF_RX 1
 extern int		netif_rx(struct sk_buff *skb);
 extern int		netif_rx_ni(struct sk_buff *skb);
+
+/**
+ * netif_rx_defer() - post buffer to the network code
+ * @skb: buffer to post
+ *
+ * This function receives a packet from a device driver and queues it
+ * for the upper (protocol) levels to process.  All non-NAPI Ethernet
+ * MAC drivers should use this instead of netif_rx() since this method
+ * allows hardware timestamping to occur within the PHY.
+ *
+ * return values:
+ * NET_RX_SUCCESS  (no congestion)
+ * NET_RX_DROP     (packet was dropped)
+ */
+static inline int netif_rx_defer(struct sk_buff *skb)
+{
+	if (skb_defer_rx_timestamp(skb))
+		return NET_RX_SUCCESS;
+	return netif_rx(skb);
+}
+
 #define HAVE_NETIF_RECEIVE_SKB 1
 extern int		netif_receive_skb(struct sk_buff *skb);
 extern gro_result_t	dev_gro_receive(struct napi_struct *napi,
-- 
1.7.0.4

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