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Date: Thu, 27 Sep 2007 16:34:30 +0200
From: Unai Uribarri <unai.uribarri@...enet.com>
To: Stephen Hemminger <shemminger@...ux-foundation.org>
Cc: "David S. Miller" <davem@...emloft.net>,
Evgeniy Polyakov <johnpol@....mipt.ru>, netdev@...r.kernel.org
Subject: Re: [RFC] af_packet: allow disabling timestamps
This small modification to Stephen's patch timestamps the skb when
needed, so the timestamp can be reused by other af_packet sockets.
Signed-off-by: Unai Uribarri <unai.uribarri@...enet.com>
--- a/net/core/sock.c
+++ b/net/core/sock.c
@@ -259,7 +259,8 @@ static void sock_disable_timestamp(struct sock *sk)
{
if (sock_flag(sk, SOCK_TIMESTAMP)) {
sock_reset_flag(sk, SOCK_TIMESTAMP);
- net_disable_timestamp();
+ if (sk->sk_family != PF_PACKET)
+ net_disable_timestamp();
}
}
@@ -1655,7 +1656,8 @@ void sock_enable_timestamp(struct sock *sk)
{
if (!sock_flag(sk, SOCK_TIMESTAMP)) {
sock_set_flag(sk, SOCK_TIMESTAMP);
- net_enable_timestamp();
+ if (sk->sk_family != PF_PACKET)
+ net_enable_timestamp();
}
}
EXPORT_SYMBOL(sock_enable_timestamp);
--- a/net/packet/af_packet.c
+++ b/net/packet/af_packet.c
@@ -570,7 +570,6 @@ 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 (dev->nd_net != &init_net)
goto drop;
@@ -648,12 +647,18 @@ 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.tv64)
+
+ if (sock_flag(sk, SOCK_TIMESTAMP)) {
+ struct timeval tv;
+ if (skb->tstamp.tv64 == 0)
+ __net_timestamp(skb);
tv = ktime_to_timeval(skb->tstamp);
- else
- do_gettimeofday(&tv);
- h->tp_sec = tv.tv_sec;
- h->tp_usec = tv.tv_usec;
+ h->tp_sec = tv.tv_sec;
+ h->tp_usec = tv.tv_usec;
+ } else {
+ h->tp_sec = 0;
+ h->tp_usec = 0;
+ }
sll = (struct sockaddr_ll*)((u8*)h + TPACKET_ALIGN(sizeof(*h)));
sll->sll_halen = dev_parse_header(skb, sll->sll_addr);
@@ -1004,6 +1009,7 @@ static int packet_create(struct net *net, struct
socket *sock, int protocol)
sock->ops = &packet_ops_spkt;
sock_init_data(sock, sk);
+ sock_set_flag(sk, SOCK_TIMESTAMP);
po = pkt_sk(sk);
sk->sk_family = PF_PACKET;
On jue, 2007-09-13 at 12:42 +0200, Stephen Hemminger wrote:
> Currently, af_packet does not allow disabling timestamps. This patch changes
> that but doesn't force global timestamps on.
>
> This shows up in bugzilla as:
> http://bugzilla.kernel.org/show_bug.cgi?id=4809
>
> Patch against net-2.6.24 tree.
>
> Signed-off-by: Stephen Hemminger <shemminger@...ux-foundation.org>
>
> --- a/net/core/sock.c 2007-09-12 15:08:43.000000000 +0200
> +++ b/net/core/sock.c 2007-09-13 12:10:19.000000000 +0200
> @@ -259,7 +259,8 @@ static void sock_disable_timestamp(struc
> {
> if (sock_flag(sk, SOCK_TIMESTAMP)) {
> sock_reset_flag(sk, SOCK_TIMESTAMP);
> - net_disable_timestamp();
> + if (sk->sk_family != PF_PACKET)
> + net_disable_timestamp();
> }
> }
>
> @@ -1645,7 +1646,8 @@ void sock_enable_timestamp(struct sock *
> {
> if (!sock_flag(sk, SOCK_TIMESTAMP)) {
> sock_set_flag(sk, SOCK_TIMESTAMP);
> - net_enable_timestamp();
> + if (sk->sk_family != PF_PACKET)
> + net_enable_timestamp();
> }
> }
> EXPORT_SYMBOL(sock_enable_timestamp);
> --- a/net/packet/af_packet.c 2007-09-12 17:07:00.000000000 +0200
> +++ b/net/packet/af_packet.c 2007-09-13 12:09:10.000000000 +0200
> @@ -572,7 +572,6 @@ static int tpacket_rcv(struct sk_buff *s
> unsigned long status = TP_STATUS_LOSING|TP_STATUS_USER;
> unsigned short macoff, netoff;
> struct sk_buff *copy_skb = NULL;
> - struct timeval tv;
>
> if (dev->nd_net != &init_net)
> goto drop;
> @@ -650,12 +649,19 @@ static int tpacket_rcv(struct sk_buff *s
> h->tp_snaplen = snaplen;
> h->tp_mac = macoff;
> h->tp_net = netoff;
> - if (skb->tstamp.tv64)
> - tv = ktime_to_timeval(skb->tstamp);
> - else
> - do_gettimeofday(&tv);
> - h->tp_sec = tv.tv_sec;
> - h->tp_usec = tv.tv_usec;
> +
> + if (sock_flag(sk, SOCK_TIMESTAMP)) {
> + struct timeval tv;
> + if (skb->tstamp.tv64)
> + tv = ktime_to_timeval(skb->tstamp);
> + else
> + do_gettimeofday(&tv);
> + h->tp_sec = tv.tv_sec;
> + h->tp_usec = tv.tv_usec;
> + } else {
> + h->tp_sec = 0;
> + h->tp_usec = 0;
> + }
>
> sll = (struct sockaddr_ll*)((u8*)h + TPACKET_ALIGN(sizeof(*h)));
> sll->sll_halen = 0;
> @@ -1014,6 +1020,7 @@ static int packet_create(struct net *net
> sock->ops = &packet_ops_spkt;
>
> sock_init_data(sock, sk);
> + sock_set_flag(sk, SOCK_TIMESTAMP);
>
> po = pkt_sk(sk);
> sk->sk_family = PF_PACKET;
> -
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