netdev - [PATCH iproute2-next 10/11] ipmonitor: Add monitoring support for stats events

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Date:   Fri, 22 Apr 2022 10:30:59 +0200
From:   Petr Machata <petrm@...dia.com>
To:     <netdev@...r.kernel.org>
CC:     David Ahern <dsahern@...il.com>,
        Stephen Hemminger <stephen@...workplumber.org>,
        Ido Schimmel <idosch@...dia.com>,
        Petr Machata <petrm@...dia.com>
Subject: [PATCH iproute2-next 10/11] ipmonitor: Add monitoring support for stats events

Toggles and offloads of HW statistics cause emission of and RTM_NEWSTATS
event. Add support to "ip monitor" for these events.

Signed-off-by: Petr Machata <petrm@...dia.com>
Reviewed-by: Ido Schimmel <idosch@...dia.com>
---
 ip/ip_common.h |  1 +
 ip/ipmonitor.c | 16 +++++++++++++++-
 ip/ipstats.c   | 20 ++++++++++++++++++++
 3 files changed, 36 insertions(+), 1 deletion(-)

diff --git a/ip/ip_common.h b/ip/ip_common.h
index 8b0a6426..9eeeb387 100644
--- a/ip/ip_common.h
+++ b/ip/ip_common.h
@@ -57,6 +57,7 @@ int print_nexthop_bucket(struct nlmsghdr *n, void *arg);
 void netns_map_init(void);
 void netns_nsid_socket_init(void);
 int print_nsid(struct nlmsghdr *n, void *arg);
+int ipstats_print(struct nlmsghdr *n, void *arg);
 char *get_name_from_nsid(int nsid);
 int get_netnsid_from_name(const char *name);
 int set_netnsid_from_name(const char *name, int nsid);
diff --git a/ip/ipmonitor.c b/ip/ipmonitor.c
index 0badda4e..a4326d2a 100644
--- a/ip/ipmonitor.c
+++ b/ip/ipmonitor.c
@@ -34,7 +34,7 @@ static void usage(void)
 		"Usage: ip monitor [ all | OBJECTS ] [ FILE ] [ label ] [ all-nsid ]\n"
 		"                  [ dev DEVICE ]\n"
 		"OBJECTS :=  address | link | mroute | neigh | netconf |\n"
-		"            nexthop | nsid | prefix | route | rule\n"
+		"            nexthop | nsid | prefix | route | rule | stats\n"
 		"FILE := file FILENAME\n");
 	exit(-1);
 }
@@ -158,6 +158,11 @@ static int accept_msg(struct rtnl_ctrl_data *ctrl,
 		print_nsid(n, arg);
 		return 0;
 
+	case RTM_NEWSTATS:
+		print_headers(fp, "[STATS]", ctrl);
+		ipstats_print(n, arg);
+		return 0;
+
 	case NLMSG_ERROR:
 	case NLMSG_NOOP:
 	case NLMSG_DONE:
@@ -185,6 +190,7 @@ int do_ipmonitor(int argc, char **argv)
 	int lprefix = 0;
 	int lneigh = 0;
 	int lnetconf = 0;
+	int lstats = 0;
 	int lrule = 0;
 	int lnsid = 0;
 	int ifindex = 0;
@@ -253,6 +259,9 @@ int do_ipmonitor(int argc, char **argv)
 		} else if (matches(*argv, "nexthop") == 0) {
 			lnexthop = 1;
 			groups = 0;
+		} else if (strcmp(*argv, "stats") == 0) {
+			lstats = 1;
+			groups = 0;
 		} else if (strcmp(*argv, "all") == 0) {
 			prefix_banner = 1;
 		} else if (matches(*argv, "all-nsid") == 0) {
@@ -349,6 +358,11 @@ int do_ipmonitor(int argc, char **argv)
 		exit(1);
 	}
 
+	if (lstats && rtnl_add_nl_group(&rth, RTNLGRP_STATS) < 0) {
+		fprintf(stderr, "Failed to add stats group to list\n");
+		exit(1);
+	}
+
 	if (listen_all_nsid && rtnl_listen_all_nsid(&rth) < 0)
 		exit(1);
 
diff --git a/ip/ipstats.c b/ip/ipstats.c
index 29ca0731..39ddca01 100644
--- a/ip/ipstats.c
+++ b/ip/ipstats.c
@@ -1219,3 +1219,23 @@ int do_ipstats(int argc, char **argv)
 
 	return rc;
 }
+
+int ipstats_print(struct nlmsghdr *n, void *arg)
+{
+	struct ipstats_stat_enabled_one one = {
+		.desc = &ipstats_stat_desc_offload_hw_s_info,
+	};
+	struct ipstats_stat_enabled enabled = {
+		.enabled = &one,
+		.nenabled = 1,
+	};
+	FILE *fp = arg;
+	int rc;
+
+	rc = ipstats_process_ifsm(n, &enabled);
+	if (rc)
+		return rc;
+
+	fflush(fp);
+	return 0;
+}
-- 
2.31.1