Message ID | 1380835645.19002.236.camel@edumazet-glaptop.roam.corp.google.com |
---|---|
State | Accepted, archived |
Delegated to: | David Miller |
Headers | show |
From: Eric Dumazet <eric.dumazet@gmail.com> Date: Thu, 03 Oct 2013 14:27:25 -0700 > From: Eric Dumazet <edumazet@google.com> > > While working on tcp listener refactoring, I found that it > would really make things easier if sock_common could include > the IPv6 addresses needed in the lookups, instead of doing > very complex games to get their values (depending on sock > being SYN_RECV, ESTABLISHED, TIME_WAIT) > > For this to happen, I need to be sure that tcp6_timewait_sock > and tcp_timewait_sock consume same number of cache lines. > > This is possible if we only use 32bits for tw_ttd, as we remove > one 32bit hole in inet_timewait_sock > > inet_tw_time_stamp() is defined and used, even if its current > implementation looks like tcp_time_stamp : We might need finer > resolution for tcp_time_stamp in the future. > > Before patch : sizeof(struct tcp6_timewait_sock) = 0xc8 > > After patch : sizeof(struct tcp6_timewait_sock) = 0xc0 > > Signed-off-by: Eric Dumazet <edumazet@google.com> > --- > v2: add a inet_tw_time_stamp() helper, per David request. Looks great, applied, thanks Eric. -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
On Thu, 2013-10-03 at 17:43 -0400, David Miller wrote:
> Looks great, applied, thanks Eric.
Thanks for your patience ;)
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diff --git a/include/net/inet_timewait_sock.h b/include/net/inet_timewait_sock.h index 48fd356..f528d1b 100644 --- a/include/net/inet_timewait_sock.h +++ b/include/net/inet_timewait_sock.h @@ -58,6 +58,11 @@ struct inet_hashinfo; # define INET_TWDR_RECYCLE_TICK (12 + 2 - INET_TWDR_RECYCLE_SLOTS_LOG) #endif +static inline u32 inet_tw_time_stamp(void) +{ + return jiffies; +} + /* TIME_WAIT reaping mechanism. */ #define INET_TWDR_TWKILL_SLOTS 8 /* Please keep this a power of 2. */ @@ -130,7 +135,7 @@ struct inet_timewait_sock { tw_tos : 8, tw_ipv6_offset : 16; kmemcheck_bitfield_end(flags); - unsigned long tw_ttd; + u32 tw_ttd; struct inet_bind_bucket *tw_tb; struct hlist_node tw_death_node; }; diff --git a/net/ipv4/inet_diag.c b/net/ipv4/inet_diag.c index 5f64875..2200027 100644 --- a/net/ipv4/inet_diag.c +++ b/net/ipv4/inet_diag.c @@ -222,7 +222,7 @@ static int inet_twsk_diag_fill(struct inet_timewait_sock *tw, u32 portid, u32 seq, u16 nlmsg_flags, const struct nlmsghdr *unlh) { - long tmo; + s32 tmo; struct inet_diag_msg *r; struct nlmsghdr *nlh; @@ -234,7 +234,7 @@ static int inet_twsk_diag_fill(struct inet_timewait_sock *tw, r = nlmsg_data(nlh); BUG_ON(tw->tw_state != TCP_TIME_WAIT); - tmo = tw->tw_ttd - jiffies; + tmo = tw->tw_ttd - inet_tw_time_stamp(); if (tmo < 0) tmo = 0; @@ -248,7 +248,7 @@ static int inet_twsk_diag_fill(struct inet_timewait_sock *tw, r->id.idiag_dst[0] = tw->tw_daddr; r->idiag_state = tw->tw_substate; r->idiag_timer = 3; - r->idiag_expires = DIV_ROUND_UP(tmo * 1000, HZ); + r->idiag_expires = jiffies_to_msecs(tmo); r->idiag_rqueue = 0; r->idiag_wqueue = 0; r->idiag_uid = 0; diff --git a/net/ipv4/inet_timewait_sock.c b/net/ipv4/inet_timewait_sock.c index 1f27c9f..9bcd8f7 100644 --- a/net/ipv4/inet_timewait_sock.c +++ b/net/ipv4/inet_timewait_sock.c @@ -387,11 +387,11 @@ void inet_twsk_schedule(struct inet_timewait_sock *tw, if (slot >= INET_TWDR_TWKILL_SLOTS) slot = INET_TWDR_TWKILL_SLOTS - 1; } - tw->tw_ttd = jiffies + timeo; + tw->tw_ttd = inet_tw_time_stamp() + timeo; slot = (twdr->slot + slot) & (INET_TWDR_TWKILL_SLOTS - 1); list = &twdr->cells[slot]; } else { - tw->tw_ttd = jiffies + (slot << INET_TWDR_RECYCLE_TICK); + tw->tw_ttd = inet_tw_time_stamp() + (slot << INET_TWDR_RECYCLE_TICK); if (twdr->twcal_hand < 0) { twdr->twcal_hand = 0; diff --git a/net/ipv6/tcp_ipv6.c b/net/ipv6/tcp_ipv6.c index 5c71501..dde8bad 100644 --- a/net/ipv6/tcp_ipv6.c +++ b/net/ipv6/tcp_ipv6.c @@ -1811,7 +1811,7 @@ static void get_timewait6_sock(struct seq_file *seq, const struct in6_addr *dest, *src; __u16 destp, srcp; const struct inet6_timewait_sock *tw6 = inet6_twsk((struct sock *)tw); - long delta = tw->tw_ttd - jiffies; + s32 delta = tw->tw_ttd - inet_tw_time_stamp(); dest = &tw6->tw_v6_daddr; src = &tw6->tw_v6_rcv_saddr;