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Date: Mon, 15 Apr 2013 13:41:42 +0200
From: Daniel Borkmann <dborkman@...hat.com>
To: davem@...emloft.net
Cc: netdev@...r.kernel.org, Willem de Bruijn <willemb@...gle.com>
Subject: [PATCH net-next] packet: move hw/sw timestamp extraction into a small helper
This patch introduces a small helper function, that is used by AF_PACKET.
Based on the flags that are passed, it extracts the packet timestamp in
the receive path. This is merely a refactoring to remove some duplicate
code in tpacket_rcv(), make it more readable, and to enable others to use
this function as well.
Cc: Willem de Bruijn <willemb@...gle.com>
Signed-off-by: Daniel Borkmann <dborkman@...hat.com>
---
include/linux/skbuff.h | 20 ++++++++++++++++++++
net/packet/af_packet.c | 38 ++++----------------------------------
2 files changed, 24 insertions(+), 34 deletions(-)
diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index e27d1c7..d0d436f 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -33,6 +33,7 @@
#include <linux/dma-mapping.h>
#include <linux/netdev_features.h>
#include <net/flow_keys.h>
+#include <linux/net_tstamp.h>
/* Don't change this without changing skb_csum_unnecessary! */
#define CHECKSUM_NONE 0
@@ -739,6 +740,25 @@ static inline struct skb_shared_hwtstamps *skb_hwtstamps(struct sk_buff *skb)
return &skb_shinfo(skb)->hwtstamps;
}
+static inline struct timespec skb_get_tstamp(struct sk_buff *skb,
+ unsigned int flags)
+{
+ struct skb_shared_hwtstamps *ts = skb_hwtstamps(skb);
+
+ if ((flags & SOF_TIMESTAMPING_SYS_HARDWARE) && ts->syststamp.tv64)
+ return ktime_to_timespec(ts->syststamp);
+ else if ((flags & SOF_TIMESTAMPING_RAW_HARDWARE) && ts->hwtstamp.tv64)
+ return ktime_to_timespec(ts->hwtstamp);
+ else if (skb->tstamp.tv64)
+ return ktime_to_timespec(skb->tstamp);
+ else {
+ struct timespec tc;
+
+ getnstimeofday(&tc);
+ return tc;
+ }
+}
+
/**
* skb_queue_empty - check if a queue is empty
* @list: queue head
diff --git a/net/packet/af_packet.c b/net/packet/af_packet.c
index 77d71f8..2a2a62e 100644
--- a/net/packet/af_packet.c
+++ b/net/packet/af_packet.c
@@ -1681,9 +1681,7 @@ static int tpacket_rcv(struct sk_buff *skb, struct net_device *dev,
unsigned long status = TP_STATUS_USER;
unsigned short macoff, netoff, hdrlen;
struct sk_buff *copy_skb = NULL;
- struct timeval tv;
struct timespec ts;
- struct skb_shared_hwtstamps *shhwtstamps = skb_hwtstamps(skb);
if (skb->pkt_type == PACKET_LOOPBACK)
goto drop;
@@ -1767,24 +1765,16 @@ static int tpacket_rcv(struct sk_buff *skb, struct net_device *dev,
skb_copy_bits(skb, 0, h.raw + macoff, snaplen);
+ ts = skb_get_tstamp(skb, po->tp_tstamp);
+
switch (po->tp_version) {
case TPACKET_V1:
h.h1->tp_len = skb->len;
h.h1->tp_snaplen = snaplen;
h.h1->tp_mac = macoff;
h.h1->tp_net = netoff;
- if ((po->tp_tstamp & SOF_TIMESTAMPING_SYS_HARDWARE)
- && shhwtstamps->syststamp.tv64)
- tv = ktime_to_timeval(shhwtstamps->syststamp);
- else if ((po->tp_tstamp & SOF_TIMESTAMPING_RAW_HARDWARE)
- && shhwtstamps->hwtstamp.tv64)
- tv = ktime_to_timeval(shhwtstamps->hwtstamp);
- else if (skb->tstamp.tv64)
- tv = ktime_to_timeval(skb->tstamp);
- else
- do_gettimeofday(&tv);
- h.h1->tp_sec = tv.tv_sec;
- h.h1->tp_usec = tv.tv_usec;
+ h.h1->tp_sec = ts.tv_sec;
+ h.h1->tp_usec = ts.tv_nsec / NSEC_PER_USEC;
hdrlen = sizeof(*h.h1);
break;
case TPACKET_V2:
@@ -1792,16 +1782,6 @@ static int tpacket_rcv(struct sk_buff *skb, struct net_device *dev,
h.h2->tp_snaplen = snaplen;
h.h2->tp_mac = macoff;
h.h2->tp_net = netoff;
- if ((po->tp_tstamp & SOF_TIMESTAMPING_SYS_HARDWARE)
- && shhwtstamps->syststamp.tv64)
- ts = ktime_to_timespec(shhwtstamps->syststamp);
- else if ((po->tp_tstamp & SOF_TIMESTAMPING_RAW_HARDWARE)
- && shhwtstamps->hwtstamp.tv64)
- ts = ktime_to_timespec(shhwtstamps->hwtstamp);
- else if (skb->tstamp.tv64)
- ts = ktime_to_timespec(skb->tstamp);
- else
- getnstimeofday(&ts);
h.h2->tp_sec = ts.tv_sec;
h.h2->tp_nsec = ts.tv_nsec;
if (vlan_tx_tag_present(skb)) {
@@ -1822,16 +1802,6 @@ static int tpacket_rcv(struct sk_buff *skb, struct net_device *dev,
h.h3->tp_snaplen = snaplen;
h.h3->tp_mac = macoff;
h.h3->tp_net = netoff;
- if ((po->tp_tstamp & SOF_TIMESTAMPING_SYS_HARDWARE)
- && shhwtstamps->syststamp.tv64)
- ts = ktime_to_timespec(shhwtstamps->syststamp);
- else if ((po->tp_tstamp & SOF_TIMESTAMPING_RAW_HARDWARE)
- && shhwtstamps->hwtstamp.tv64)
- ts = ktime_to_timespec(shhwtstamps->hwtstamp);
- else if (skb->tstamp.tv64)
- ts = ktime_to_timespec(skb->tstamp);
- else
- getnstimeofday(&ts);
h.h3->tp_sec = ts.tv_sec;
h.h3->tp_nsec = ts.tv_nsec;
hdrlen = sizeof(*h.h3);
--
1.7.11.7
--
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