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Date: Sun, 18 Sep 2016 16:23:47 -0700
From: Roopa Prabhu <roopa@...ulusnetworks.com>
To: Jiri Pirko <jiri@...nulli.us>
CC: netdev@...r.kernel.org, davem@...emloft.net, idosch@...lanox.com,
eladr@...lanox.com, yotamg@...lanox.com, nogahf@...lanox.com,
ogerlitz@...lanox.com, nikolay@...ulusnetworks.com,
linville@...driver.com, tgraf@...g.ch, gospo@...ulusnetworks.com,
sfeldma@...il.com, ast@...mgrid.com, edumazet@...gle.com,
hannes@...essinduktion.org, f.fainelli@...il.com,
dsa@...ulusnetworks.com, jhs@...atatu.com,
vivien.didelot@...oirfairelinux.com, john.fastabend@...el.com,
andrew@...n.ch, ivecera@...hat.com
Subject: Re: [patch net-next RFC 1/2] fib: introduce fib notification infrastructure
On 9/6/16, 5:01 AM, Jiri Pirko wrote:
> From: Jiri Pirko <jiri@...lanox.com>
>
> This allows to pass information about added/deleted fib entries to
> whoever is interested. This is done in a very similar way as devinet
> notifies address additions/removals.
>
> Signed-off-by: Jiri Pirko <jiri@...lanox.com>
> ---
> include/net/ip_fib.h | 19 +++++++++++++++++++
> net/ipv4/fib_trie.c | 43 +++++++++++++++++++++++++++++++++++++++++++
> 2 files changed, 62 insertions(+)
>
> diff --git a/include/net/ip_fib.h b/include/net/ip_fib.h
> index 4079fc1..9ad7ba9 100644
> --- a/include/net/ip_fib.h
> +++ b/include/net/ip_fib.h
> @@ -22,6 +22,7 @@
> #include <net/fib_rules.h>
> #include <net/inetpeer.h>
> #include <linux/percpu.h>
> +#include <linux/notifier.h>
>
> struct fib_config {
> u8 fc_dst_len;
> @@ -184,6 +185,24 @@ __be32 fib_info_update_nh_saddr(struct net *net, struct fib_nh *nh);
> #define FIB_RES_PREFSRC(net, res) ((res).fi->fib_prefsrc ? : \
> FIB_RES_SADDR(net, res))
>
> +struct fib_notifier_info {
> + u32 dst;
> + int dst_len;
> + struct fib_info *fi;
> + u8 tos;
> + u8 type;
> + u32 tb_id;
> + u32 nlflags;
> +};
> +
> +enum fib_event_type {
> + FIB_EVENT_TYPE_ADD,
> + FIB_EVENT_TYPE_DEL,
> +};
> +
> +int register_fib_notifier(struct notifier_block *nb);
> +int unregister_fib_notifier(struct notifier_block *nb);
> +
> struct fib_table {
> struct hlist_node tb_hlist;
> u32 tb_id;
> diff --git a/net/ipv4/fib_trie.c b/net/ipv4/fib_trie.c
> index e2ffc2a..19ec471 100644
> --- a/net/ipv4/fib_trie.c
> +++ b/net/ipv4/fib_trie.c
> @@ -73,6 +73,7 @@
> #include <linux/slab.h>
> #include <linux/export.h>
> #include <linux/vmalloc.h>
> +#include <linux/notifier.h>
> #include <net/net_namespace.h>
> #include <net/ip.h>
> #include <net/protocol.h>
> @@ -84,6 +85,36 @@
> #include <trace/events/fib.h>
> #include "fib_lookup.h"
>
> +static BLOCKING_NOTIFIER_HEAD(fib_chain);
> +
> +int register_fib_notifier(struct notifier_block *nb)
> +{
> + return blocking_notifier_chain_register(&fib_chain, nb);
> +}
> +EXPORT_SYMBOL(register_fib_notifier);
> +
> +int unregister_fib_notifier(struct notifier_block *nb)
> +{
> + return blocking_notifier_chain_unregister(&fib_chain, nb);
> +}
> +EXPORT_SYMBOL(unregister_fib_notifier);
> +
> +static int call_fib_notifiers(enum fib_event_type event_type, u32 dst,
> + int dst_len, struct fib_info *fi,
> + u8 tos, u8 type, u32 tb_id, u32 nlflags)
> +{
> + struct fib_notifier_info info = {
> + .dst = dst,
> + .dst_len = dst_len,
> + .fi = fi,
> + .tos = tos,
> + .type = type,
> + .tb_id = tb_id,
> + .nlflags = nlflags,
> + };
> + return blocking_notifier_call_chain(&fib_chain, event_type, &info);
> +}
> +
> #define MAX_STAT_DEPTH 32
>
> #define KEYLENGTH (8*sizeof(t_key))
> @@ -1190,6 +1221,10 @@ int fib_table_insert(struct fib_table *tb, struct fib_config *cfg)
> fib_release_info(fi_drop);
> if (state & FA_S_ACCESSED)
> rt_cache_flush(cfg->fc_nlinfo.nl_net);
> +
> + call_fib_notifiers(FIB_EVENT_TYPE_ADD, key, plen, fi,
> + new_fa->fa_tos, cfg->fc_type,
> + tb->tb_id, cfg->fc_nlflags);
> rtmsg_fib(RTM_NEWROUTE, htonl(key), new_fa, plen,
> tb->tb_id, &cfg->fc_nlinfo, NLM_F_REPLACE);
>
> @@ -1241,6 +1276,8 @@ int fib_table_insert(struct fib_table *tb, struct fib_config *cfg)
> tb->tb_num_default++;
>
> rt_cache_flush(cfg->fc_nlinfo.nl_net);
> + call_fib_notifiers(FIB_EVENT_TYPE_ADD, key, plen, fi, tos,
> + cfg->fc_type, tb->tb_id, cfg->fc_nlflags);
It appears that this is in addition to the existing switchdev_fib_ipv4_add call right above this.
Is the intent to do both ?. i don't see a need to do both.
and switchdev_fib_ipv4_add offloads before the route is added to the kernel.
But the notifier seems to fire after the route is added to the kernel.
> rtmsg_fib(RTM_NEWROUTE, htonl(key), new_fa, plen, new_fa->tb_id,
> &cfg->fc_nlinfo, nlflags);
> succeeded:
> @@ -1542,6 +1579,8 @@ int fib_table_delete(struct fib_table *tb, struct fib_config *cfg)
> switchdev_fib_ipv4_del(key, plen, fa_to_delete->fa_info, tos,
> cfg->fc_type, tb->tb_id);
>
> + call_fib_notifiers(FIB_EVENT_TYPE_DEL, key, plen, fa_to_delete->fa_info,
> + tos, cfg->fc_type, tb->tb_id, 0);
> rtmsg_fib(RTM_DELROUTE, htonl(key), fa_to_delete, plen, tb->tb_id,
> &cfg->fc_nlinfo, 0);
>
> @@ -1857,6 +1896,10 @@ int fib_table_flush(struct fib_table *tb)
> switchdev_fib_ipv4_del(n->key, KEYLENGTH - fa->fa_slen,
> fi, fa->fa_tos, fa->fa_type,
> tb->tb_id);
> + call_fib_notifiers(FIB_EVENT_TYPE_DEL, n->key,
> + KEYLENGTH - fa->fa_slen,
> + fi, fa->fa_tos, fa->fa_type,
> + tb->tb_id, 0);
> hlist_del_rcu(&fa->fa_list);
> fib_release_info(fa->fa_info);
> alias_free_mem_rcu(fa);
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