[PATCH net-next v4 1/5] net-timestamp: extend SCM_TIMESTAMPING ancillary data struct
From: Willem de Bruijn <willemb@google.com>
Date: 2014-07-30 15:48:50
Subsystem:
networking [general], networking [sockets], the rest · Maintainers:
"David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Kuniyuki Iwashima, Willem de Bruijn, Linus Torvalds
Applications that request kernel tx timestamps with SO_TIMESTAMPING read timestamps as recvmsg() ancillary data. The response is defined implicitly as timespec[3]. 1) define struct scm_timestamping explicitly and 2) 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. 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@google.com> --- include/linux/skbuff.h | 3 +++ include/net/sock.h | 4 +++- include/uapi/linux/errqueue.h | 15 +++++++++++++++ net/core/skbuff.c | 1 + net/socket.c | 20 +++++++++++--------- 5 files changed, 33 insertions(+), 10 deletions(-)
diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index 281dece..477f0f6 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h@@ -249,6 +249,9 @@ 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 b91c886..02f5b35 100644
--- a/include/net/sock.h
+++ b/include/net/sock.h@@ -2169,7 +2169,9 @@ 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))) __sock_recv_timestamp(msg, sk, skb);
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..1bcd05d 100644
--- a/net/core/skbuff.c
+++ b/net/core/skbuff.c@@ -3521,6 +3521,7 @@ 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; err = sock_queue_err_skb(sk, skb);
diff --git a/net/socket.c b/net/socket.c
index d8222c0..dc0cc5d 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);
@@ -714,24 +715,25 @@ 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 && 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