From c14ac9451c34832554db33386a4393be8bba3a7b Mon Sep 17 00:00:00 2001 From: Soheil Hassas Yeganeh Date: Sat, 2 Apr 2016 23:08:12 -0400 Subject: 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 Acked-by: Willem de Bruijn Signed-off-by: David S. Miller --- net/ipv6/ip6_output.c | 15 +++++++++------ 1 file changed, 9 insertions(+), 6 deletions(-) (limited to 'net/ipv6/ip6_output.c') diff --git a/net/ipv6/ip6_output.c b/net/ipv6/ip6_output.c index 9428345d3a07..612f3d138bf0 100644 --- a/net/ipv6/ip6_output.c +++ b/net/ipv6/ip6_output.c @@ -1258,7 +1258,8 @@ static int __ip6_append_data(struct sock *sk, int getfrag(void *from, char *to, int offset, int len, int odd, struct sk_buff *skb), void *from, int length, int transhdrlen, - unsigned int flags, int dontfrag) + unsigned int flags, int dontfrag, + const struct sockcm_cookie *sockc) { struct sk_buff *skb, *skb_prev = NULL; unsigned int maxfraglen, fragheaderlen, mtu, orig_mtu; @@ -1329,7 +1330,7 @@ emsgsize: csummode = CHECKSUM_PARTIAL; if (sk->sk_type == SOCK_DGRAM || sk->sk_type == SOCK_RAW) { - sock_tx_timestamp(sk, &tx_flags); + sock_tx_timestamp(sk, sockc->tsflags, &tx_flags); if (tx_flags & SKBTX_ANY_SW_TSTAMP && sk->sk_tsflags & SOF_TIMESTAMPING_OPT_ID) tskey = sk->sk_tskey++; @@ -1565,7 +1566,8 @@ int ip6_append_data(struct sock *sk, int odd, struct sk_buff *skb), void *from, int length, int transhdrlen, int hlimit, int tclass, struct ipv6_txoptions *opt, struct flowi6 *fl6, - struct rt6_info *rt, unsigned int flags, int dontfrag) + struct rt6_info *rt, unsigned int flags, int dontfrag, + const struct sockcm_cookie *sockc) { struct inet_sock *inet = inet_sk(sk); struct ipv6_pinfo *np = inet6_sk(sk); @@ -1593,7 +1595,8 @@ int ip6_append_data(struct sock *sk, return __ip6_append_data(sk, fl6, &sk->sk_write_queue, &inet->cork.base, &np->cork, sk_page_frag(sk), getfrag, - from, length, transhdrlen, flags, dontfrag); + from, length, transhdrlen, flags, dontfrag, + sockc); } EXPORT_SYMBOL_GPL(ip6_append_data); @@ -1752,7 +1755,7 @@ struct sk_buff *ip6_make_skb(struct sock *sk, int hlimit, int tclass, struct ipv6_txoptions *opt, struct flowi6 *fl6, struct rt6_info *rt, unsigned int flags, - int dontfrag) + int dontfrag, const struct sockcm_cookie *sockc) { struct inet_cork_full cork; struct inet6_cork v6_cork; @@ -1779,7 +1782,7 @@ struct sk_buff *ip6_make_skb(struct sock *sk, err = __ip6_append_data(sk, fl6, &queue, &cork.base, &v6_cork, ¤t->task_frag, getfrag, from, length + exthdrlen, transhdrlen + exthdrlen, - flags, dontfrag); + flags, dontfrag, sockc); if (err) { __ip6_flush_pending_frames(sk, &queue, &cork, &v6_cork); return ERR_PTR(err); -- cgit