netdev - Re: [patch net-next v2 06/12] net: mroute: Check if rule is a default rule

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Message-ID: <93dcea9d-94eb-39cf-4102-e5c59fb2dfa5@huawei.com>
Date:   Mon, 25 Sep 2017 09:28:21 +0800
From:   Yunsheng Lin <linyunsheng@...wei.com>
To:     Jiri Pirko <jiri@...nulli.us>, <netdev@...r.kernel.org>
CC:     <davem@...emloft.net>, <yotamg@...lanox.com>,
        <idosch@...lanox.com>, <mlxsw@...lanox.com>,
        <nikolay@...ulusnetworks.com>, <andrew@...n.ch>
Subject: Re: [patch net-next v2 06/12] net: mroute: Check if rule is a default
 rule

Hi, Jiri

On 2017/9/25 1:22, Jiri Pirko wrote:
> From: Yotam Gigi <yotamg@...lanox.com>
> 
> When the ipmr starts, it adds one default FIB rule that matches all packets
> and sends them to the DEFAULT (multicast) FIB table. A more complex rule
> can be added by user to specify that for a specific interface, a packet
> should be look up at either an arbitrary table or according to the l3mdev
> of the interface.
> 
> For drivers willing to offload the ipmr logic into a hardware but don't
> want to offload all the FIB rules functionality, provide a function that
> can indicate whether the FIB rule is the default multicast rule, thus only
> one routing table is needed.
> 
> This way, a driver can register to the FIB notification chain, get
> notifications about FIB rules added and trigger some kind of an internal
> abort mechanism when a non default rule is added by the user.
> 
> Signed-off-by: Yotam Gigi <yotamg@...lanox.com>
> Reviewed-by: Ido Schimmel <idosch@...lanox.com>
> Signed-off-by: Jiri Pirko <jiri@...lanox.com>
> ---
>  include/linux/mroute.h |  7 +++++++
>  net/ipv4/ipmr.c        | 10 ++++++++++
>  2 files changed, 17 insertions(+)
> 
> diff --git a/include/linux/mroute.h b/include/linux/mroute.h
> index 5566580..b072a84 100644
> --- a/include/linux/mroute.h
> +++ b/include/linux/mroute.h
> @@ -5,6 +5,7 @@
>  #include <linux/pim.h>
>  #include <linux/rhashtable.h>
>  #include <net/sock.h>
> +#include <net/fib_rules.h>
>  #include <net/fib_notifier.h>
>  #include <uapi/linux/mroute.h>
>  
> @@ -19,6 +20,7 @@ int ip_mroute_getsockopt(struct sock *, int, char __user *, int __user *);
>  int ipmr_ioctl(struct sock *sk, int cmd, void __user *arg);
>  int ipmr_compat_ioctl(struct sock *sk, unsigned int cmd, void __user *arg);
>  int ip_mr_init(void);
> +bool ipmr_rule_default(const struct fib_rule *rule);
>  #else
>  static inline int ip_mroute_setsockopt(struct sock *sock, int optname,
>  				       char __user *optval, unsigned int optlen)
> @@ -46,6 +48,11 @@ static inline int ip_mroute_opt(int opt)
>  {
>  	return 0;
>  }
> +
> +static inline bool ipmr_rule_default(const struct fib_rule *rule)
> +{
> +	return true;
> +}
>  #endif
>  
>  struct vif_device {
> diff --git a/net/ipv4/ipmr.c b/net/ipv4/ipmr.c
> index 2a795d2..a714f55 100644
> --- a/net/ipv4/ipmr.c
> +++ b/net/ipv4/ipmr.c
> @@ -320,6 +320,16 @@ static unsigned int ipmr_rules_seq_read(struct net *net)
>  }
>  #endif
>  
> +bool ipmr_rule_default(const struct fib_rule *rule)
> +{
> +#if IS_ENABLED(CONFIG_FIB_RULES)
> +	return fib_rule_matchall(rule) && rule->table == RT_TABLE_DEFAULT;
> +#else
> +	return true;
> +#endif

In patch 02, You have the following, can you do the same for the above?
+#ifdef CONFIG_IP_MROUTE
+void ipmr_cache_free(struct mfc_cache *mfc_cache);
+#else
+static inline void ipmr_cache_free(struct mfc_cache *mfc_cache)
+{
+}
+#endif

> +}
> +EXPORT_SYMBOL(ipmr_rule_default);
> +
>  static inline int ipmr_hash_cmp(struct rhashtable_compare_arg *arg,
>  				const void *ptr)
>  {
>