diff options
| author | Willem de Bruijn <willemb@google.com> | 2014-08-04 22:11:48 -0400 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2014-08-05 16:35:54 -0700 |
| commit | e7fd2885385157d46c85f282fc6d7d297db43e1f (patch) | |
| tree | 14e9d00ed87b2b45882c8cb8dd1b9b4d221724f8 /net | |
| parent | 09c2d251b70723650ba47e83571ff49281320f7c (diff) | |
| download | linux-e7fd2885385157d46c85f282fc6d7d297db43e1f.tar.bz2 | |
net-timestamp: SCHED timestamp on entering packet scheduler
Kernel transmit latency is often incurred in the packet scheduler.
Introduce a new timestamp on transmission just before entering the
scheduler. When data travels through multiple devices (bonding,
tunneling, ...) each device will export an individual timestamp.
Signed-off-by: Willem de Bruijn <willemb@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
| -rw-r--r-- | net/core/dev.c | 4 | ||||
| -rw-r--r-- | net/core/skbuff.c | 16 | ||||
| -rw-r--r-- | net/socket.c | 3 |
3 files changed, 19 insertions, 4 deletions
diff --git a/net/core/dev.c b/net/core/dev.c index b370230fe1d3..1c15b189c52b 100644 --- a/net/core/dev.c +++ b/net/core/dev.c @@ -132,6 +132,7 @@ #include <linux/hashtable.h> #include <linux/vmalloc.h> #include <linux/if_macvlan.h> +#include <linux/errqueue.h> #include "net-sysfs.h" @@ -2876,6 +2877,9 @@ static int __dev_queue_xmit(struct sk_buff *skb, void *accel_priv) skb_reset_mac_header(skb); + if (unlikely(skb_shinfo(skb)->tx_flags & SKBTX_SCHED_TSTAMP)) + __skb_tstamp_tx(skb, NULL, skb->sk, SCM_TSTAMP_SCHED); + /* Disable soft irqs for various locks below. Also * stops preemption for RCU. */ diff --git a/net/core/skbuff.c b/net/core/skbuff.c index 0df4f1d14c5a..9705c0732aab 100644 --- a/net/core/skbuff.c +++ b/net/core/skbuff.c @@ -3490,10 +3490,10 @@ int sock_queue_err_skb(struct sock *sk, struct sk_buff *skb) } EXPORT_SYMBOL(sock_queue_err_skb); -void skb_tstamp_tx(struct sk_buff *orig_skb, - struct skb_shared_hwtstamps *hwtstamps) +void __skb_tstamp_tx(struct sk_buff *orig_skb, + struct skb_shared_hwtstamps *hwtstamps, + struct sock *sk, int tstype) { - struct sock *sk = orig_skb->sk; struct sock_exterr_skb *serr; struct sk_buff *skb; int err; @@ -3521,7 +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 = SCM_TSTAMP_SND; + serr->ee.ee_info = tstype; if (sk->sk_tsflags & SOF_TIMESTAMPING_OPT_ID) serr->ee.ee_data = skb_shinfo(skb)->tskey; @@ -3530,6 +3530,14 @@ void skb_tstamp_tx(struct sk_buff *orig_skb, if (err) kfree_skb(skb); } +EXPORT_SYMBOL_GPL(__skb_tstamp_tx); + +void skb_tstamp_tx(struct sk_buff *orig_skb, + struct skb_shared_hwtstamps *hwtstamps) +{ + return __skb_tstamp_tx(orig_skb, hwtstamps, orig_skb->sk, + SCM_TSTAMP_SND); +} EXPORT_SYMBOL_GPL(skb_tstamp_tx); void skb_complete_wifi_ack(struct sk_buff *skb, bool acked) diff --git a/net/socket.c b/net/socket.c index 255d9b802723..3a2778d71631 100644 --- a/net/socket.c +++ b/net/socket.c @@ -617,6 +617,9 @@ void sock_tx_timestamp(struct sock *sk, __u8 *tx_flags) *tx_flags |= SKBTX_HW_TSTAMP; if (sk->sk_tsflags & SOF_TIMESTAMPING_TX_SOFTWARE) *tx_flags |= SKBTX_SW_TSTAMP; + if (sk->sk_tsflags & SOF_TIMESTAMPING_TX_SCHED) + *tx_flags |= SKBTX_SCHED_TSTAMP; + if (sock_flag(sk, SOCK_WIFI_STATUS)) *tx_flags |= SKBTX_WIFI_STATUS; } |