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Message-Id: <1405971357-22830-2-git-send-email-willemb@google.com>
Date: Mon, 21 Jul 2014 15:35:53 -0400
From: Willem de Bruijn <willemb@...gle.com>
To: netdev@...r.kernel.org
Cc: davem@...emloft.net, eric.dumazet@...il.com,
richardcochran@...il.com, Willem de Bruijn <willemb@...gle.com>
Subject: [PATCH net-next v3 1/5] net-timestamp: extend SCM_TIMESTAMPING ancillary data struct
Applications that request kernel tx timestamps with SO_TIMESTAMPING
read timestamps as recvmsg() ancillary data. The response is defined
implicitly as timespec[3]. Define the struct, and
1) Add support for new tstamp types. On tx, scm_timestamping always
accompanies a sock_extended_err. Define previously unused field
ee_info to signal the type of ts[0]. Introduce SCM_TSTAMP_SND.
2) Add support to discern timestamps. When multiple timestamped
packets are in flight concurrently, correlating a timestamp with
the right send() call is non-trivial. Define previously unused field
ee_data to communicate a send() specific key, skb->mark. It is
up to the application to optionally set this field to a unique
value for each send call.
The reception path is not modified. On rx, no struct similar to
sock_extended_err is passed along with SCM_TIMESTAMPING.
Signed-off-by: Willem de Bruijn <willemb@...gle.com>
---
include/linux/skbuff.h | 3 +++
include/net/sock.h | 3 ++-
include/uapi/linux/errqueue.h | 15 +++++++++++++++
net/core/skbuff.c | 2 ++
net/socket.c | 22 ++++++++++++----------
5 files changed, 34 insertions(+), 11 deletions(-)
diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index 3694303..e71224a 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -262,6 +262,9 @@ enum {
SKBTX_SHARED_FRAG = 1 << 5,
};
+#define SKBTX_ANY_SW_TSTAMP SKBTX_SW_TSTAMP
+#define SKBTX_ANY_TSTAMP (SKBTX_HW_TSTAMP | SKBTX_ANY_SW_TSTAMP)
+
/*
* The callback notifies userspace to release buffers when skb DMA is done in
* lower device, the skb last reference should be 0 when calling this.
diff --git a/include/net/sock.h b/include/net/sock.h
index 28f7346..00abc4c 100644
--- a/include/net/sock.h
+++ b/include/net/sock.h
@@ -2172,7 +2172,8 @@ sock_recv_timestamp(struct msghdr *msg, struct sock *sk, struct sk_buff *skb)
*/
if (sock_flag(sk, SOCK_RCVTSTAMP) ||
sock_flag(sk, SOCK_TIMESTAMPING_RX_SOFTWARE) ||
- (kt.tv64 && sock_flag(sk, SOCK_TIMESTAMPING_SOFTWARE)) ||
+ (kt.tv64 && (sock_flag(sk, SOCK_TIMESTAMPING_SOFTWARE) ||
+ skb_shinfo(skb)->tx_flags & SKBTX_ANY_SW_TSTAMP)) ||
(hwtstamps->hwtstamp.tv64 &&
sock_flag(sk, SOCK_TIMESTAMPING_RAW_HARDWARE)) ||
(hwtstamps->syststamp.tv64 &&
diff --git a/include/uapi/linux/errqueue.h b/include/uapi/linux/errqueue.h
index aacd4fb..97e1872 100644
--- a/include/uapi/linux/errqueue.h
+++ b/include/uapi/linux/errqueue.h
@@ -22,5 +22,20 @@ struct sock_extended_err {
#define SO_EE_OFFENDER(ee) ((struct sockaddr*)((ee)+1))
+/**
+ * struct scm_timestamping - timestamps exposed through cmsg
+ *
+ * The timestamping interfaces SO_TIMESTAMPING, MSG_TSTAMP_*
+ * communicate network timestamps by passing this struct in a cmsg with
+ * recvmsg(). See Documentation/networking/timestamping.txt for details.
+ */
+struct scm_timestamping {
+ struct timespec ts[3];
+};
+
+/* type of ts[0], passed in ee_info */
+enum {
+ SCM_TSTAMP_SND = 1, /* driver passed skb to NIC */
+};
#endif /* _UAPI_LINUX_ERRQUEUE_H */
diff --git a/net/core/skbuff.c b/net/core/skbuff.c
index c1a3303..d95b09d 100644
--- a/net/core/skbuff.c
+++ b/net/core/skbuff.c
@@ -3521,6 +3521,8 @@ void skb_tstamp_tx(struct sk_buff *orig_skb,
memset(serr, 0, sizeof(*serr));
serr->ee.ee_errno = ENOMSG;
serr->ee.ee_origin = SO_EE_ORIGIN_TIMESTAMPING;
+ serr->ee.ee_info = hwtstamps ? 0 : SCM_TSTAMP_SND;
+ serr->ee.ee_data = skb->mark;
err = sock_queue_err_skb(sk, skb);
diff --git a/net/socket.c b/net/socket.c
index abf56b2..7fc2eef 100644
--- a/net/socket.c
+++ b/net/socket.c
@@ -106,6 +106,7 @@
#include <linux/sockios.h>
#include <linux/atalk.h>
#include <net/busy_poll.h>
+#include <linux/errqueue.h>
#ifdef CONFIG_NET_RX_BUSY_POLL
unsigned int sysctl_net_busy_read __read_mostly;
@@ -697,7 +698,7 @@ void __sock_recv_timestamp(struct msghdr *msg, struct sock *sk,
struct sk_buff *skb)
{
int need_software_tstamp = sock_flag(sk, SOCK_RCVTSTAMP);
- struct timespec ts[3];
+ struct scm_timestamping tss;
int empty = 1;
struct skb_shared_hwtstamps *shhwtstamps =
skb_hwtstamps(skb);
@@ -714,28 +715,29 @@ void __sock_recv_timestamp(struct msghdr *msg, struct sock *sk,
put_cmsg(msg, SOL_SOCKET, SCM_TIMESTAMP,
sizeof(tv), &tv);
} else {
- skb_get_timestampns(skb, &ts[0]);
+ struct timespec ts;
+ skb_get_timestampns(skb, &ts);
put_cmsg(msg, SOL_SOCKET, SCM_TIMESTAMPNS,
- sizeof(ts[0]), &ts[0]);
+ sizeof(ts), &ts);
}
}
-
- memset(ts, 0, sizeof(ts));
- if (sock_flag(sk, SOCK_TIMESTAMPING_SOFTWARE) &&
- ktime_to_timespec_cond(skb->tstamp, ts + 0))
+ memset(&tss, 0, sizeof(tss));
+ if ((sock_flag(sk, SOCK_TIMESTAMPING_SOFTWARE) ||
+ skb_shinfo(skb)->tx_flags & SKBTX_ANY_SW_TSTAMP) &&
+ ktime_to_timespec_cond(skb->tstamp, tss.ts + 0))
empty = 0;
if (shhwtstamps) {
if (sock_flag(sk, SOCK_TIMESTAMPING_SYS_HARDWARE) &&
- ktime_to_timespec_cond(shhwtstamps->syststamp, ts + 1))
+ ktime_to_timespec_cond(shhwtstamps->syststamp, tss.ts + 1))
empty = 0;
if (sock_flag(sk, SOCK_TIMESTAMPING_RAW_HARDWARE) &&
- ktime_to_timespec_cond(shhwtstamps->hwtstamp, ts + 2))
+ ktime_to_timespec_cond(shhwtstamps->hwtstamp, tss.ts + 2))
empty = 0;
}
if (!empty)
put_cmsg(msg, SOL_SOCKET,
- SCM_TIMESTAMPING, sizeof(ts), &ts);
+ SCM_TIMESTAMPING, sizeof(tss), &tss);
}
EXPORT_SYMBOL_GPL(__sock_recv_timestamp);
--
2.0.0.526.g5318336
--
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