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tcp: Extend SOF_TIMESTAMPING_RX_SOFTWARE to TCP recvmsg

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When SOF_TIMESTAMPING_RX_SOFTWARE is enabled for tcp sockets, return the
timestamp corresponding to the highest sequence number data returned.

Previously the skb->tstamp is overwritten when a TCP packet is placed
in the out of order queue.  While the packet is in the ooo queue, save the
timestamp in the TCB_SKB_CB.  This space is shared with the gso_*
options which are only used on the tx path, and a previously unused 4
byte hole.

When skbs are coalesced either in the sk_receive_queue or the
out_of_order_queue always choose the timestamp of the appended skb to
maintain the invariant of returning the timestamp of the last byte in
the recvmsg buffer.

Signed-off-by: Mike Maloney <maloney@google.com>
Acked-by: Willem de Bruijn <willemb@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Mike Maloney
2017-08-22 17:08:48 -04:00
committed by David S. Miller
parent b28547728d
commit 98aaa913b4
5 changed files with 108 additions and 5 deletions
Download Patch File Download Diff File Expand all files Collapse all files

65
net/ipv4/tcp.c
View File

@@ -269,6 +269,7 @@
#include <linux/err.h>
#include <linux/time.h>
#include <linux/slab.h>
#include <linux/errqueue.h>
#include <net/icmp.h>
#include <net/inet_common.h>
@@ -1695,6 +1696,61 @@ int tcp_peek_len(struct socket *sock)
}
EXPORT_SYMBOL(tcp_peek_len);
static void tcp_update_recv_tstamps(struct sk_buff *skb,
struct scm_timestamping *tss)
{
if (skb->tstamp)
tss->ts[0] = ktime_to_timespec(skb->tstamp);
else
tss->ts[0] = (struct timespec) {0};
if (skb_hwtstamps(skb)->hwtstamp)
tss->ts[2] = ktime_to_timespec(skb_hwtstamps(skb)->hwtstamp);
else
tss->ts[2] = (struct timespec) {0};
}
/* Similar to __sock_recv_timestamp, but does not require an skb */
void tcp_recv_timestamp(struct msghdr *msg, const struct sock *sk,
struct scm_timestamping *tss)
{
struct timeval tv;
bool has_timestamping = false;
if (tss->ts[0].tv_sec || tss->ts[0].tv_nsec) {
if (sock_flag(sk, SOCK_RCVTSTAMP)) {
if (sock_flag(sk, SOCK_RCVTSTAMPNS)) {
put_cmsg(msg, SOL_SOCKET, SCM_TIMESTAMPNS,
sizeof(tss->ts[0]), &tss->ts[0]);
} else {
tv.tv_sec = tss->ts[0].tv_sec;
tv.tv_usec = tss->ts[0].tv_nsec / 1000;
put_cmsg(msg, SOL_SOCKET, SCM_TIMESTAMP,
sizeof(tv), &tv);
}
}
if (sk->sk_tsflags & SOF_TIMESTAMPING_SOFTWARE)
has_timestamping = true;
else
tss->ts[0] = (struct timespec) {0};
}
if (tss->ts[2].tv_sec || tss->ts[2].tv_nsec) {
if (sk->sk_tsflags & SOF_TIMESTAMPING_RAW_HARDWARE)
has_timestamping = true;
else
tss->ts[2] = (struct timespec) {0};
}
if (has_timestamping) {
tss->ts[1] = (struct timespec) {0};
put_cmsg(msg, SOL_SOCKET, SCM_TIMESTAMPING,
sizeof(*tss), tss);
}
}
/*
* This routine copies from a sock struct into the user buffer.
*
@@ -1716,6 +1772,8 @@ int tcp_recvmsg(struct sock *sk, struct msghdr *msg, size_t len, int nonblock,
long timeo;
struct sk_buff *skb, *last;
u32 urg_hole = 0;
struct scm_timestamping tss;
bool has_tss = false;
if (unlikely(flags & MSG_ERRQUEUE))
return inet_recv_error(sk, msg, len, addr_len);
@@ -1911,6 +1969,10 @@ skip_copy:
if (used + offset < skb->len)
continue;
if (TCP_SKB_CB(skb)->has_rxtstamp) {
tcp_update_recv_tstamps(skb, &tss);
has_tss = true;
}
if (TCP_SKB_CB(skb)->tcp_flags & TCPHDR_FIN)
goto found_fin_ok;
if (!(flags & MSG_PEEK))
@@ -1929,6 +1991,9 @@ skip_copy:
* on connected socket. I was just happy when found this 8) --ANK
*/
if (has_tss)
tcp_recv_timestamp(msg, sk, &tss);
/* Clean up data we have read: This will do ACK frames. */
tcp_cleanup_rbuf(sk, copied);