summaryrefslogtreecommitdiffstats
path: root/net/ipv4/tcp.c
diff options
context:
space:
mode:
authorWillem de Bruijn <willemb@google.com>2014-08-04 22:11:49 -0400
committerDavid S. Miller <davem@davemloft.net>2014-08-05 16:35:54 -0700
commit4ed2d765dfaccff5ebdac68e2064b59125033a3b (patch)
tree7ba9b411995d2d365b25fe49eeff95075fec4d0d /net/ipv4/tcp.c
parente7fd2885385157d46c85f282fc6d7d297db43e1f (diff)
downloadop-kernel-dev-4ed2d765dfaccff5ebdac68e2064b59125033a3b.zip
op-kernel-dev-4ed2d765dfaccff5ebdac68e2064b59125033a3b.tar.gz
net-timestamp: TCP timestamping
TCP timestamping extends SO_TIMESTAMPING to bytestreams. Bytestreams do not have a 1:1 relationship between send() buffers and network packets. The feature interprets a send call on a bytestream as a request for a timestamp for the last byte in that send() buffer. The choice corresponds to a request for a timestamp when all bytes in the buffer have been sent. That assumption depends on in-order kernel transmission. This is the common case. That said, it is possible to construct a traffic shaping tree that would result in reordering. The guarantee is strong, then, but not ironclad. This implementation supports send and sendpages (splice). GSO replaces one large packet with multiple smaller packets. This patch also copies the option into the correct smaller packet. This patch does not yet support timestamping on data in an initial TCP Fast Open SYN, because that takes a very different data path. If ID generation in ee_data is enabled, bytestream timestamps return a byte offset, instead of the packet counter for datagrams. The implementation supports a single timestamp per packet. It silenty replaces requests for previous timestamps. To avoid missing tstamps, flush the tcp queue by disabling Nagle, cork and autocork. Missing tstamps can be detected by offset when the ee_data ID is enabled. Implementation details: - On GSO, the timestamping code can be included in the main loop. I moved it into its own loop to reduce the impact on the common case to a single branch. - To avoid leaking the absolute seqno to userspace, the offset returned in ee_data must always be relative. It is an offset between an skb and sk field. The first is always set (also for GSO & ACK). The second must also never be uninitialized. Only allow the ID option on sockets in the ESTABLISHED state, for which the seqno is available. Never reset it to zero (instead, move it to the current seqno when reenabling the option). Signed-off-by: Willem de Bruijn <willemb@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4/tcp.c')
-rw-r--r--net/ipv4/tcp.c22
1 files changed, 19 insertions, 3 deletions
diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c
index 9d2118e..744af67 100644
--- a/net/ipv4/tcp.c
+++ b/net/ipv4/tcp.c
@@ -426,6 +426,15 @@ void tcp_init_sock(struct sock *sk)
}
EXPORT_SYMBOL(tcp_init_sock);
+void tcp_tx_timestamp(struct sock *sk, struct sk_buff *skb)
+{
+ struct skb_shared_info *shinfo = skb_shinfo(skb);
+
+ sock_tx_timestamp(sk, &shinfo->tx_flags);
+ if (shinfo->tx_flags & SKBTX_ANY_SW_TSTAMP)
+ shinfo->tskey = TCP_SKB_CB(skb)->seq + skb->len - 1;
+}
+
/*
* Wait for a TCP event.
*
@@ -523,7 +532,7 @@ unsigned int tcp_poll(struct file *file, struct socket *sock, poll_table *wait)
}
/* This barrier is coupled with smp_wmb() in tcp_reset() */
smp_rmb();
- if (sk->sk_err)
+ if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue))
mask |= POLLERR;
return mask;
@@ -959,8 +968,10 @@ new_segment:
copied += copy;
offset += copy;
- if (!(size -= copy))
+ if (!(size -= copy)) {
+ tcp_tx_timestamp(sk, skb);
goto out;
+ }
if (skb->len < size_goal || (flags & MSG_OOB))
continue;
@@ -1252,8 +1263,10 @@ new_segment:
from += copy;
copied += copy;
- if ((seglen -= copy) == 0 && iovlen == 0)
+ if ((seglen -= copy) == 0 && iovlen == 0) {
+ tcp_tx_timestamp(sk, skb);
goto out;
+ }
if (skb->len < max || (flags & MSG_OOB) || unlikely(tp->repair))
continue;
@@ -1617,6 +1630,9 @@ int tcp_recvmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
struct sk_buff *skb;
u32 urg_hole = 0;
+ if (unlikely(flags & MSG_ERRQUEUE))
+ return ip_recv_error(sk, msg, len, addr_len);
+
if (sk_can_busy_loop(sk) && skb_queue_empty(&sk->sk_receive_queue) &&
(sk->sk_state == TCP_ESTABLISHED))
sk_busy_loop(sk, nonblock);
OpenPOWER on IntegriCloud