netdev - [RFC iproute2-next 09/11] ip: nexthop: add a helper which retrieves and prints cached nh entry

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Date:   Wed, 29 Sep 2021 18:28:46 +0300
From:   Nikolay Aleksandrov <razor@...ckwall.org>
To:     netdev@...r.kernel.org
Cc:     roopa@...dia.com, donaldsharp72@...il.com, dsahern@...il.com,
        idosch@...sch.org, Nikolay Aleksandrov <nikolay@...dia.com>
Subject: [RFC iproute2-next 09/11] ip: nexthop: add a helper which retrieves and prints cached nh entry

From: Nikolay Aleksandrov <nikolay@...dia.com>

Add a helper which looks for a nexthop in the cache and if not found
reads the entry from the kernel and caches it. Finally the entry is
printed.

Signed-off-by: Nikolay Aleksandrov <nikolay@...dia.com>
---
 ip/ipnexthop.c | 16 ++++++++++++++++
 ip/nh_common.h |  3 +++
 2 files changed, 19 insertions(+)

diff --git a/ip/ipnexthop.c b/ip/ipnexthop.c
index 37b94d6702df..fdd0d0926630 100644
--- a/ip/ipnexthop.c
+++ b/ip/ipnexthop.c
@@ -640,6 +640,22 @@ int print_nexthop(struct nlmsghdr *n, void *arg)
 	return 0;
 }
 
+void print_cache_nexthop_id(FILE *fp, const char *fp_prefix, const char *jsobj,
+			    __u32 nh_id)
+{
+	struct nh_entry *nhe = ipnh_cache_get(nh_id);
+
+	if (!nhe) {
+		nhe = ipnh_cache_add(nh_id);
+		if (!nhe)
+			return;
+	}
+
+	if (fp_prefix)
+		print_string(PRINT_FP, NULL, "%s", fp_prefix);
+	__print_nexthop_entry(fp, jsobj, nhe, false);
+}
+
 int print_nexthop_bucket(struct nlmsghdr *n, void *arg)
 {
 	struct nhmsg *nhm = NLMSG_DATA(n);
diff --git a/ip/nh_common.h b/ip/nh_common.h
index a34b0d20916e..a672d658a9ea 100644
--- a/ip/nh_common.h
+++ b/ip/nh_common.h
@@ -46,4 +46,7 @@ struct nh_entry {
 	struct nexthop_grp	*nh_groups;
 };
 
+void print_cache_nexthop_id(FILE *fp, const char *fp_prefix, const char *jsobj,
+			    __u32 nh_id);
+
 #endif /* __NH_COMMON_H__ */
-- 
2.31.1