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authorSoheil Hassas Yeganeh <soheil@google.com>2016-04-03 06:08:12 +0300
committerDavid S. Miller <davem@davemloft.net>2016-04-04 22:50:30 +0300
commitc14ac9451c34832554db33386a4393be8bba3a7b (patch)
tree99f4d7c46d01732fcbfdf8de89e1d9846d56c3b3 /net/ipv4/ping.c
parentad1e46a837163a3e7160a1250825bcfafd2e714b (diff)
downloadlinux-c14ac9451c34832554db33386a4393be8bba3a7b.tar.xz
sock: enable timestamping using control messages
Currently, SOL_TIMESTAMPING can only be enabled using setsockopt. This is very costly when users want to sample writes to gather tx timestamps. Add support for enabling SO_TIMESTAMPING via control messages by using tsflags added in `struct sockcm_cookie` (added in the previous patches in this series) to set the tx_flags of the last skb created in a sendmsg. With this patch, the timestamp recording bits in tx_flags of the skbuff is overridden if SO_TIMESTAMPING is passed in a cmsg. Please note that this is only effective for overriding the recording timestamps flags. Users should enable timestamp reporting (e.g., SOF_TIMESTAMPING_SOFTWARE | SOF_TIMESTAMPING_OPT_ID) using socket options and then should ask for SOF_TIMESTAMPING_TX_* using control messages per sendmsg to sample timestamps for each write. Signed-off-by: Soheil Hassas Yeganeh <soheil@google.com> Acked-by: Willem de Bruijn <willemb@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4/ping.c')
-rw-r--r--net/ipv4/ping.c5
1 files changed, 3 insertions, 2 deletions
diff --git a/net/ipv4/ping.c b/net/ipv4/ping.c
index 670639bf9f7e..66ddcb60519a 100644
--- a/net/ipv4/ping.c
+++ b/net/ipv4/ping.c
@@ -737,6 +737,7 @@ static int ping_v4_sendmsg(struct sock *sk, struct msghdr *msg, size_t len)
/* no remote port */
}
+ ipc.sockc.tsflags = sk->sk_tsflags;
ipc.addr = inet->inet_saddr;
ipc.opt = NULL;
ipc.oif = sk->sk_bound_dev_if;
@@ -744,8 +745,6 @@ static int ping_v4_sendmsg(struct sock *sk, struct msghdr *msg, size_t len)
ipc.ttl = 0;
ipc.tos = -1;
- sock_tx_timestamp(sk, &ipc.tx_flags);
-
if (msg->msg_controllen) {
err = ip_cmsg_send(sk, msg, &ipc, false);
if (unlikely(err)) {
@@ -768,6 +767,8 @@ static int ping_v4_sendmsg(struct sock *sk, struct msghdr *msg, size_t len)
rcu_read_unlock();
}
+ sock_tx_timestamp(sk, ipc.sockc.tsflags, &ipc.tx_flags);
+
saddr = ipc.addr;
ipc.addr = faddr = daddr;