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Message-ID: <46A8391C.2020605@cosmosbay.com>
Date: Thu, 26 Jul 2007 08:03:08 +0200
From: Eric Dumazet <dada1@...mosbay.com>
To: Varun Chandramohan <varunc@...ux.vnet.ibm.com>
CC: davem@...emloft.net, netdev@...r.kernel.org, kaber@...sh.net,
socketcan@...tkopp.net, shemminger@...ux-foundation.org,
krkumar2@...ibm.com
Subject: Re: [PATCH 3/4 -rev1] Initilize and populate age field
Varun Chandramohan a écrit :
> The age field is filled with the current time at the time of creation of the route. When the routes are dumped
> then the age value stored in the route structure is subtracted from the current time value and the difference is the age expressed in secs.
>
> Signed-off-by: Varun Chandramohan <varunc@...ux.vnet.ibm.com>
> ---
> net/ipv4/fib_hash.c | 3 +++
> net/ipv4/fib_lookup.h | 3 ++-
> net/ipv4/fib_semantics.c | 16 +++++++++++++---
> net/ipv4/fib_trie.c | 1 +
> 4 files changed, 19 insertions(+), 4 deletions(-)
>
> diff --git a/net/ipv4/fib_hash.c b/net/ipv4/fib_hash.c
> index 07e843a..faa7364 100644
> --- a/net/ipv4/fib_hash.c
> +++ b/net/ipv4/fib_hash.c
> @@ -448,6 +448,7 @@ static int fn_hash_insert(struct fib_tab
> fa->fa_info = fi;
> fa->fa_type = cfg->fc_type;
> fa->fa_scope = cfg->fc_scope;
> + fa->fa_age = 0;
> state = fa->fa_state;
> fa->fa_state &= ~FA_S_ACCESSED;
> fib_hash_genid++;
> @@ -507,6 +508,7 @@ static int fn_hash_insert(struct fib_tab
> new_fa->fa_type = cfg->fc_type;
> new_fa->fa_scope = cfg->fc_scope;
> new_fa->fa_state = 0;
> + new_fa->fa_age = 0;
>
> /*
> * Insert new entry to the list.
> @@ -697,6 +699,7 @@ fn_hash_dump_bucket(struct sk_buff *skb,
> f->fn_key,
> fz->fz_order,
> fa->fa_tos,
> + &fa->fa_age,
> fa->fa_info,
> NLM_F_MULTI) < 0) {
> cb->args[4] = i;
> diff --git a/net/ipv4/fib_lookup.h b/net/ipv4/fib_lookup.h
> index eef9eec..c9145b5 100644
> --- a/net/ipv4/fib_lookup.h
> +++ b/net/ipv4/fib_lookup.h
> @@ -13,6 +13,7 @@ struct fib_alias {
> u8 fa_type;
> u8 fa_scope;
> u8 fa_state;
> + time_t fa_age;
> };
>
> #define FA_S_ACCESSED 0x01
> @@ -27,7 +28,7 @@ extern struct fib_info *fib_create_info(
> extern int fib_nh_match(struct fib_config *cfg, struct fib_info *fi);
> extern int fib_dump_info(struct sk_buff *skb, u32 pid, u32 seq, int event,
> u32 tb_id, u8 type, u8 scope, __be32 dst,
> - int dst_len, u8 tos, struct fib_info *fi,
> + int dst_len, u8 tos, time_t *age, struct fib_info *fi,
> unsigned int);
> extern void rtmsg_fib(int event, __be32 key, struct fib_alias *fa,
> int dst_len, u32 tb_id, struct nl_info *info,
> diff --git a/net/ipv4/fib_semantics.c b/net/ipv4/fib_semantics.c
> index c434119..1822d92 100644
> --- a/net/ipv4/fib_semantics.c
> +++ b/net/ipv4/fib_semantics.c
> @@ -278,7 +278,8 @@ static inline size_t fib_nlmsg_size(stru
> + nla_total_size(4) /* RTA_TABLE */
> + nla_total_size(4) /* RTA_DST */
> + nla_total_size(4) /* RTA_PRIORITY */
> - + nla_total_size(4); /* RTA_PREFSRC */
> + + nla_total_size(4) /* RTA_PREFSRC */
> + + nla_total_size(4); /*RTA_AGE*/
Not clear to me what happens on platforms where sizeof(time_t) is 8
>
> /* space for nested metrics */
> payload += nla_total_size((RTAX_MAX * nla_total_size(4)));
> @@ -313,7 +314,7 @@ void rtmsg_fib(int event, __be32 key, st
>
> err = fib_dump_info(skb, info->pid, seq, event, tb_id,
> fa->fa_type, fa->fa_scope, key, dst_len,
> - fa->fa_tos, fa->fa_info, nlm_flags);
> + fa->fa_tos, &fa->fa_age, fa->fa_info, nlm_flags);
> if (err < 0) {
> /* -EMSGSIZE implies BUG in fib_nlmsg_size() */
> WARN_ON(err == -EMSGSIZE);
> @@ -940,11 +941,12 @@ __be32 __fib_res_prefsrc(struct fib_resu
> }
>
> int fib_dump_info(struct sk_buff *skb, u32 pid, u32 seq, int event,
> - u32 tb_id, u8 type, u8 scope, __be32 dst, int dst_len, u8 tos,
> + u32 tb_id, u8 type, u8 scope, __be32 dst, int dst_len, u8 tos, time_t *age,
> struct fib_info *fi, unsigned int flags)
> {
> struct nlmsghdr *nlh;
> struct rtmsg *rtm;
> + struct timeval tv;
>
> nlh = nlmsg_put(skb, pid, seq, event, sizeof(*rtm), flags);
> if (nlh == NULL)
> @@ -985,6 +987,14 @@ int fib_dump_info(struct sk_buff *skb, u
> NLA_PUT_U32(skb, RTA_FLOW, fi->fib_nh[0].nh_tclassid);
> #endif
> }
> +
> + do_gettimeofday(&tv);
> + if (!*age) {
> + *age = timeval_to_sec(&tv);
> + NLA_PUT_U32(skb, RTA_AGE, *age);
here, what happens if sizeof(time_t) is not 4 ?
> + } else {
> + NLA_PUT_U32(skb, RTA_AGE, timeval_to_sec(&tv) - *age);
> + }
> #ifdef CONFIG_IP_ROUTE_MULTIPATH
> if (fi->fib_nhs > 1) {
> struct rtnexthop *rtnh;
> diff --git a/net/ipv4/fib_trie.c b/net/ipv4/fib_trie.c
> index 30e332a..be2d1d6 100644
> --- a/net/ipv4/fib_trie.c
> +++ b/net/ipv4/fib_trie.c
> @@ -1884,6 +1884,7 @@ static int fn_trie_dump_fa(t_key key, in
> xkey,
> plen,
> fa->fa_tos,
> + &fa->fa_age,
> fa->fa_info, 0) < 0) {
> cb->args[4] = i;
> return -1;
-
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