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[NET]: convert network timestamps to ktime_t

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We currently use a special structure (struct skb_timeval) and plain
'struct timeval' to store packet timestamps in sk_buffs and struct
sock.

This has some drawbacks :
- Fixed resolution of micro second.
- Waste of space on 64bit platforms where sizeof(struct timeval)=16

I suggest using ktime_t that is a nice abstraction of high resolution
time services, currently capable of nanosecond resolution.

As sizeof(ktime_t) is 8 bytes, using ktime_t in 'struct sock' permits
a 8 byte shrink of this structure on 64bit architectures. Some other
structures also benefit from this size reduction (struct ipq in
ipv4/ip_fragment.c, struct frag_queue in ipv6/reassembly.c, ...)

Once this ktime infrastructure adopted, we can more easily provide
nanosecond resolution on top of it. (ioctl SIOCGSTAMPNS and/or
SO_TIMESTAMPNS/SCM_TIMESTAMPNS)

Note : this patch includes a bug correction in
compat_sock_get_timestamp() where a "err = 0;" was missing (so this
syscall returned -ENOENT instead of 0)

Signed-off-by: Eric Dumazet <dada1@cosmosbay.com>
CC: Stephen Hemminger <shemminger@linux-foundation.org>
CC: John find <linux.kernel@free.fr>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2007-04-19 16:16:32 -07:00 committed by David S. Miller
parent 3927f2e8f9
commit b7aa0bf70c
20 changed files with 85 additions and 98 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

26
include/linux/skbuff.h
View File

@ -27,6 +27,7 @@
#include <net/checksum.h>
#include <linux/rcupdate.h>
#include <linux/dmaengine.h>
#include <linux/hrtimer.h>
#define HAVE_ALLOC_SKB /* For the drivers to know */
#define HAVE_ALIGNABLE_SKB /* Ditto 8) */
@ -156,11 +157,6 @@ struct skb_shared_info {
#define SKB_DATAREF_SHIFT 16
#define SKB_DATAREF_MASK ((1 << SKB_DATAREF_SHIFT) - 1)
struct skb_timeval {
u32 off_sec;
u32 off_usec;
};
enum {
SKB_FCLONE_UNAVAILABLE,
@ -233,7 +229,7 @@ struct sk_buff {
struct sk_buff *prev;
struct sock *sk;
struct skb_timeval tstamp;
ktime_t tstamp;
struct net_device *dev;
int iif;
/* 4 byte hole on 64 bit*/
@ -1365,26 +1361,14 @@ extern void skb_add_mtu(int mtu);
*/
static inline void skb_get_timestamp(const struct sk_buff *skb, struct timeval *stamp)
{
stamp->tv_sec = skb->tstamp.off_sec;
stamp->tv_usec = skb->tstamp.off_usec;
*stamp = ktime_to_timeval(skb->tstamp);
}
/**
* skb_set_timestamp - set timestamp of a skb
* @skb: skb to set stamp of
* @stamp: pointer to struct timeval to get stamp from
*
* Timestamps are stored in the skb as offsets to a base timestamp.
* This function converts a struct timeval to an offset and stores
* it in the skb.
*/
static inline void skb_set_timestamp(struct sk_buff *skb, const struct timeval *stamp)
static inline void __net_timestamp(struct sk_buff *skb)
{
skb->tstamp.off_sec = stamp->tv_sec;
skb->tstamp.off_usec = stamp->tv_usec;
skb->tstamp = ktime_get_real();
}
extern void __net_timestamp(struct sk_buff *skb);
extern __sum16 __skb_checksum_complete(struct sk_buff *skb);

18
include/net/sock.h
View File

@ -244,7 +244,7 @@ struct sock {
struct sk_filter *sk_filter;
void *sk_protinfo;
struct timer_list sk_timer;
struct timeval sk_stamp;
ktime_t sk_stamp;
struct socket *sk_socket;
void *sk_user_data;
struct page *sk_sndmsg_page;
@ -1307,19 +1307,19 @@ static inline int sock_intr_errno(long timeo)
static __inline__ void
sock_recv_timestamp(struct msghdr *msg, struct sock *sk, struct sk_buff *skb)
{
struct timeval stamp;
ktime_t kt = skb->tstamp;
skb_get_timestamp(skb, &stamp);
if (sock_flag(sk, SOCK_RCVTSTAMP)) {
struct timeval tv;
/* Race occurred between timestamp enabling and packet
receiving. Fill in the current time for now. */
if (stamp.tv_sec == 0)
do_gettimeofday(&stamp);
skb_set_timestamp(skb, &stamp);
put_cmsg(msg, SOL_SOCKET, SO_TIMESTAMP, sizeof(struct timeval),
&stamp);
if (kt.tv64 == 0)
kt = ktime_get_real();
skb->tstamp = kt;
tv = ktime_to_timeval(kt);
put_cmsg(msg, SOL_SOCKET, SO_TIMESTAMP, sizeof(tv), &tv);
} else
sk->sk_stamp = stamp;
sk->sk_stamp = kt;
}
/**

1
kernel/time.c
View File

@ -469,6 +469,7 @@ struct timeval ns_to_timeval(const s64 nsec)
return tv;
}
EXPORT_SYMBOL(ns_to_timeval);
/*
* Convert jiffies to milliseconds and back.

6
net/bridge/netfilter/ebt_ulog.c
View File

@ -130,6 +130,7 @@ static void ebt_ulog_packet(unsigned int hooknr, const struct sk_buff *skb,
unsigned int group = uloginfo->nlgroup;
ebt_ulog_buff_t *ub = &ulog_buffers[group];
spinlock_t *lock = &ub->lock;
ktime_t kt;
if ((uloginfo->cprange == 0) ||
(uloginfo->cprange > skb->len + ETH_HLEN))
@ -164,9 +165,10 @@ static void ebt_ulog_packet(unsigned int hooknr, const struct sk_buff *skb,
/* Fill in the ulog data */
pm->version = EBT_ULOG_VERSION;
do_gettimeofday(&pm->stamp);
kt = ktime_get_real();
pm->stamp = ktime_to_timeval(kt);
if (ub->qlen == 1)
skb_set_timestamp(ub->skb, &pm->stamp);
ub->skb->tstamp = kt;
pm->data_len = copy_len;
pm->mark = skb->mark;
pm->hook = hooknr;

15
net/compat.c
View File

@ -545,15 +545,20 @@ int compat_sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp)
struct compat_timeval __user *ctv =
(struct compat_timeval __user*) userstamp;
int err = -ENOENT;
struct timeval tv;
if (!sock_flag(sk, SOCK_TIMESTAMP))
sock_enable_timestamp(sk);
if (sk->sk_stamp.tv_sec == -1)
tv = ktime_to_timeval(sk->sk_stamp);
if (tv.tv_sec == -1)
return err;
if (sk->sk_stamp.tv_sec == 0)
do_gettimeofday(&sk->sk_stamp);
if (put_user(sk->sk_stamp.tv_sec, &ctv->tv_sec) ||
put_user(sk->sk_stamp.tv_usec, &ctv->tv_usec))
if (tv.tv_sec == 0) {
sk->sk_stamp = ktime_get_real();
tv = ktime_to_timeval(sk->sk_stamp);
}
err = 0;
if (put_user(tv.tv_sec, &ctv->tv_sec) ||
put_user(tv.tv_usec, &ctv->tv_usec))
err = -EFAULT;
return err;
}

19
net/core/dev.c
View File

@ -1031,23 +1031,12 @@ void net_disable_timestamp(void)
atomic_dec(&netstamp_needed);
}
void __net_timestamp(struct sk_buff *skb)
{
struct timeval tv;
do_gettimeofday(&tv);
skb_set_timestamp(skb, &tv);
}
EXPORT_SYMBOL(__net_timestamp);
static inline void net_timestamp(struct sk_buff *skb)
{
if (atomic_read(&netstamp_needed))
__net_timestamp(skb);
else {
skb->tstamp.off_sec = 0;
skb->tstamp.off_usec = 0;
}
else
skb->tstamp.tv64 = 0;
}
/*
@ -1577,7 +1566,7 @@ int netif_rx(struct sk_buff *skb)
if (netpoll_rx(skb))
return NET_RX_DROP;
if (!skb->tstamp.off_sec)
if (!skb->tstamp.tv64)
net_timestamp(skb);
/*
@ -1769,7 +1758,7 @@ int netif_receive_skb(struct sk_buff *skb)
if (skb->dev->poll && netpoll_rx(skb))
return NET_RX_DROP;
if (!skb->tstamp.off_sec)
if (!skb->tstamp.tv64)
net_timestamp(skb);
if (!skb->iif)

16
net/core/sock.c
View File

@ -1512,8 +1512,7 @@ void sock_init_data(struct socket *sock, struct sock *sk)
sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT;
sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT;
sk->sk_stamp.tv_sec = -1L;
sk->sk_stamp.tv_usec = -1L;
sk->sk_stamp = ktime_set(-1L, -1L);
atomic_set(&sk->sk_refcnt, 1);
}
@ -1554,14 +1553,17 @@ EXPORT_SYMBOL(release_sock);
int sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp)
{
struct timeval tv;
if (!sock_flag(sk, SOCK_TIMESTAMP))
sock_enable_timestamp(sk);
if (sk->sk_stamp.tv_sec == -1)
tv = ktime_to_timeval(sk->sk_stamp);
if (tv.tv_sec == -1)
return -ENOENT;
if (sk->sk_stamp.tv_sec == 0)
do_gettimeofday(&sk->sk_stamp);
return copy_to_user(userstamp, &sk->sk_stamp, sizeof(struct timeval)) ?
-EFAULT : 0;
if (tv.tv_sec == 0) {
sk->sk_stamp = ktime_get_real();
tv = ktime_to_timeval(sk->sk_stamp);
}
return copy_to_user(userstamp, &tv, sizeof(tv)) ? -EFAULT : 0;
}
EXPORT_SYMBOL(sock_get_timestamp);

2
net/econet/af_econet.c
View File

@ -162,7 +162,7 @@ static int econet_recvmsg(struct kiocb *iocb, struct socket *sock,
err = memcpy_toiovec(msg->msg_iov, skb->data, copied);
if (err)
goto out_free;
skb_get_timestamp(skb, &sk->sk_stamp);
sk->sk_stamp = skb->tstamp;
if (msg->msg_name)
memcpy(msg->msg_name, skb->cb, msg->msg_namelen);

8
net/ipv4/ip_fragment.c
View File

@ -92,7 +92,7 @@ struct ipq {
spinlock_t lock;
atomic_t refcnt;
struct timer_list timer; /* when will this queue expire? */
struct timeval stamp;
ktime_t stamp;
int iif;
unsigned int rid;
struct inet_peer *peer;
@ -592,7 +592,7 @@ static void ip_frag_queue(struct ipq *qp, struct sk_buff *skb)
if (skb->dev)
qp->iif = skb->dev->ifindex;
skb->dev = NULL;
skb_get_timestamp(skb, &qp->stamp);
qp->stamp = skb->tstamp;
qp->meat += skb->len;
atomic_add(skb->truesize, &ip_frag_mem);
if (offset == 0)
@ -674,7 +674,7 @@ static struct sk_buff *ip_frag_reasm(struct ipq *qp, struct net_device *dev)
head->next = NULL;
head->dev = dev;
skb_set_timestamp(head, &qp->stamp);
head->tstamp = qp->stamp;
iph = head->nh.iph;
iph->frag_off = 0;
@ -734,7 +734,7 @@ struct sk_buff *ip_defrag(struct sk_buff *skb, u32 user)
return NULL;
}
void ipfrag_init(void)
void __init ipfrag_init(void)
{
ipfrag_hash_rnd = (u32) ((num_physpages ^ (num_physpages>>7)) ^
(jiffies ^ (jiffies >> 6)));

6
net/ipv4/netfilter/ip_queue.c
View File

@ -197,6 +197,7 @@ ipq_build_packet_message(struct ipq_queue_entry *entry, int *errp)
struct sk_buff *skb;
struct ipq_packet_msg *pmsg;
struct nlmsghdr *nlh;
struct timeval tv;
read_lock_bh(&queue_lock);
@ -241,8 +242,9 @@ ipq_build_packet_message(struct ipq_queue_entry *entry, int *errp)
pmsg->packet_id = (unsigned long )entry;
pmsg->data_len = data_len;
pmsg->timestamp_sec = entry->skb->tstamp.off_sec;
pmsg->timestamp_usec = entry->skb->tstamp.off_usec;
tv = ktime_to_timeval(entry->skb->tstamp);
pmsg->timestamp_sec = tv.tv_sec;
pmsg->timestamp_usec = tv.tv_usec;
pmsg->mark = entry->skb->mark;
pmsg->hook = entry->info->hook;
pmsg->hw_protocol = entry->skb->protocol;

8
net/ipv4/netfilter/ipt_ULOG.c
View File

@ -187,6 +187,7 @@ static void ipt_ulog_packet(unsigned int hooknum,
ulog_packet_msg_t *pm;
size_t size, copy_len;
struct nlmsghdr *nlh;
struct timeval tv;
/* ffs == find first bit set, necessary because userspace
* is already shifting groupnumber, but we need unshifted.
@ -232,13 +233,14 @@ static void ipt_ulog_packet(unsigned int hooknum,
pm = NLMSG_DATA(nlh);
/* We might not have a timestamp, get one */
if (skb->tstamp.off_sec == 0)
if (skb->tstamp.tv64 == 0)
__net_timestamp((struct sk_buff *)skb);
/* copy hook, prefix, timestamp, payload, etc. */
pm->data_len = copy_len;
put_unaligned(skb->tstamp.off_sec, &pm->timestamp_sec);
put_unaligned(skb->tstamp.off_usec, &pm->timestamp_usec);
tv = ktime_to_timeval(skb->tstamp);
put_unaligned(tv.tv_sec, &pm->timestamp_sec);
put_unaligned(tv.tv_usec, &pm->timestamp_usec);
put_unaligned(skb->mark, &pm->mark);
pm->hook = hooknum;
if (prefix != NULL)

2
net/ipv6/exthdrs.c
View File

@ -255,7 +255,7 @@ static int ipv6_dest_hao(struct sk_buff **skbp, int optoff)
ipv6_addr_copy(&ipv6h->saddr, &hao->addr);
ipv6_addr_copy(&hao->addr, &tmp_addr);
if (skb->tstamp.off_sec == 0)
if (skb->tstamp.tv64 == 0)
__net_timestamp(skb);
return 1;

6
net/ipv6/netfilter/ip6_queue.c
View File

@ -195,6 +195,7 @@ ipq_build_packet_message(struct ipq_queue_entry *entry, int *errp)
struct sk_buff *skb;
struct ipq_packet_msg *pmsg;
struct nlmsghdr *nlh;
struct timeval tv;
read_lock_bh(&queue_lock);
@ -239,8 +240,9 @@ ipq_build_packet_message(struct ipq_queue_entry *entry, int *errp)
pmsg->packet_id = (unsigned long )entry;
pmsg->data_len = data_len;
pmsg->timestamp_sec = entry->skb->tstamp.off_sec;
pmsg->timestamp_usec = entry->skb->tstamp.off_usec;
tv = ktime_to_timeval(entry->skb->tstamp);
pmsg->timestamp_sec = tv.tv_sec;
pmsg->timestamp_usec = tv.tv_usec;
pmsg->mark = entry->skb->mark;
pmsg->hook = entry->info->hook;
pmsg->hw_protocol = entry->skb->protocol;

6
net/ipv6/netfilter/nf_conntrack_reasm.c
View File

@ -82,7 +82,7 @@ struct nf_ct_frag6_queue
struct sk_buff *fragments;
int len;
int meat;
struct timeval stamp;
ktime_t stamp;
unsigned int csum;
__u8 last_in; /* has first/last segment arrived? */
#define COMPLETE 4
@ -542,7 +542,7 @@ static int nf_ct_frag6_queue(struct nf_ct_frag6_queue *fq, struct sk_buff *skb,
fq->fragments = skb;
skb->dev = NULL;
skb_get_timestamp(skb, &fq->stamp);
fq->stamp = skb->tstamp;
fq->meat += skb->len;
atomic_add(skb->truesize, &nf_ct_frag6_mem);
@ -648,7 +648,7 @@ nf_ct_frag6_reasm(struct nf_ct_frag6_queue *fq, struct net_device *dev)
head->next = NULL;
head->dev = dev;
skb_set_timestamp(head, &fq->stamp);
head->tstamp = fq->stamp;
head->nh.ipv6h->payload_len = htons(payload_len);
/* Yes, and fold redundant checksum back. 8) */

6
net/ipv6/reassembly.c
View File

@ -88,7 +88,7 @@ struct frag_queue
int len;
int meat;
int iif;
struct timeval stamp;
ktime_t stamp;
unsigned int csum;
__u8 last_in; /* has first/last segment arrived? */
#define COMPLETE 4
@ -562,7 +562,7 @@ static void ip6_frag_queue(struct frag_queue *fq, struct sk_buff *skb,
if (skb->dev)
fq->iif = skb->dev->ifindex;
skb->dev = NULL;
skb_get_timestamp(skb, &fq->stamp);
fq->stamp = skb->tstamp;
fq->meat += skb->len;
atomic_add(skb->truesize, &ip6_frag_mem);
@ -663,7 +663,7 @@ static int ip6_frag_reasm(struct frag_queue *fq, struct sk_buff **skb_in,
head->next = NULL;
head->dev = dev;
skb_set_timestamp(head, &fq->stamp);
head->tstamp = fq->stamp;
head->nh.ipv6h->payload_len = htons(payload_len);
IP6CB(head)->nhoff = nhoff;

4
net/ipx/af_ipx.c
View File

@ -1807,8 +1807,8 @@ static int ipx_recvmsg(struct kiocb *iocb, struct socket *sock,
copied);
if (rc)
goto out_free;
if (skb->tstamp.off_sec)
skb_get_timestamp(skb, &sk->sk_stamp);
if (skb->tstamp.tv64)
sk->sk_stamp = skb->tstamp;
msg->msg_namelen = sizeof(*sipx);

8
net/netfilter/nfnetlink_log.c
View File

@ -509,11 +509,11 @@ __build_packet_message(struct nfulnl_instance *inst,
NFA_PUT(inst->skb, NFULA_HWADDR, sizeof(phw), &phw);
}
if (skb->tstamp.off_sec) {
if (skb->tstamp.tv64) {
struct nfulnl_msg_packet_timestamp ts;
ts.sec = cpu_to_be64(skb->tstamp.off_sec);
ts.usec = cpu_to_be64(skb->tstamp.off_usec);
struct timeval tv = ktime_to_timeval(skb->tstamp);
ts.sec = cpu_to_be64(tv.tv_sec);
ts.usec = cpu_to_be64(tv.tv_usec);
NFA_PUT(inst->skb, NFULA_TIMESTAMP, sizeof(ts), &ts);
}

8
net/netfilter/nfnetlink_queue.c
View File

@ -495,11 +495,11 @@ nfqnl_build_packet_message(struct nfqnl_instance *queue,
NFA_PUT(skb, NFQA_HWADDR, sizeof(phw), &phw);
}
if (entskb->tstamp.off_sec) {
if (entskb->tstamp.tv64) {
struct nfqnl_msg_packet_timestamp ts;
ts.sec = cpu_to_be64(entskb->tstamp.off_sec);
ts.usec = cpu_to_be64(entskb->tstamp.off_usec);
struct timeval tv = ktime_to_timeval(entskb->tstamp);
ts.sec = cpu_to_be64(tv.tv_sec);
ts.usec = cpu_to_be64(tv.tv_usec);
NFA_PUT(skb, NFQA_TIMESTAMP, sizeof(ts), &ts);
}

8
net/packet/af_packet.c
View File

@ -582,6 +582,7 @@ static int tpacket_rcv(struct sk_buff *skb, struct net_device *dev, struct packe
unsigned long status = TP_STATUS_LOSING|TP_STATUS_USER;
unsigned short macoff, netoff;
struct sk_buff *copy_skb = NULL;
struct timeval tv;
if (skb->pkt_type == PACKET_LOOPBACK)
goto drop;
@ -656,12 +657,13 @@ static int tpacket_rcv(struct sk_buff *skb, struct net_device *dev, struct packe
h->tp_snaplen = snaplen;
h->tp_mac = macoff;
h->tp_net = netoff;
if (skb->tstamp.off_sec == 0) {
if (skb->tstamp.tv64 == 0) {
__net_timestamp(skb);
sock_enable_timestamp(sk);
}
h->tp_sec = skb->tstamp.off_sec;
h->tp_usec = skb->tstamp.off_usec;
tv = ktime_to_timeval(skb->tstamp);
h->tp_sec = tv.tv_sec;
h->tp_usec = tv.tv_usec;
sll = (struct sockaddr_ll*)((u8*)h + TPACKET_ALIGN(sizeof(*h)));
sll->sll_halen = 0;

10
net/sunrpc/svcsock.c
View File

@ -798,16 +798,12 @@ svc_udp_recvfrom(struct svc_rqst *rqstp)
dprintk("svc: recvfrom returned error %d\n", -err);
}
rqstp->rq_addrlen = sizeof(rqstp->rq_addr);
if (skb->tstamp.off_sec == 0) {
struct timeval tv;
tv.tv_sec = xtime.tv_sec;
tv.tv_usec = xtime.tv_nsec / NSEC_PER_USEC;
skb_set_timestamp(skb, &tv);
if (skb->tstamp.tv64 == 0) {
skb->tstamp = ktime_get_real();
/* Don't enable netstamp, sunrpc doesn't
need that much accuracy */
}
skb_get_timestamp(skb, &svsk->sk_sk->sk_stamp);
svsk->sk_sk->sk_stamp = skb->tstamp;
set_bit(SK_DATA, &svsk->sk_flags); /* there may be more data... */
/*