netdev - [PATCH iproute2-next] ip ntable: Add support for "mcast

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Message-ID: <20250508111301.544391-1-idosch@nvidia.com>
Date: Thu, 8 May 2025 14:13:01 +0300
From: Ido Schimmel <idosch@...dia.com>
To: <netdev@...r.kernel.org>
CC: <dsahern@...il.com>, <stephen@...workplumber.org>, <petrm@...dia.com>,
	"Ido Schimmel" <idosch@...dia.com>
Subject: [PATCH iproute2-next] ip ntable: Add support for "mcast_reprobes" parameter

Kernel commit 8da86466b837 ("net: neighbour: Add mcast_resolicit to
configure the number of multicast resolicitations in PROBE state.")
added the "NDTPA_MCAST_REPROBES" netlink attribute that allows user
space to set / get the number of multicast probes that are sent by the
kernel in PROBE state after unicast probes did not solicit a response.

Add support for this parameter in iproute2.

Example usage and output:

 $ ip ntable show dev dummy0 name arp_cache
 inet arp_cache
     dev dummy0
     refcnt 1 reachable 43430 base_reachable 30000 retrans 1000
     gc_stale 60000 delay_probe 5000 queue 101
     app_probes 0 ucast_probes 3 mcast_probes 3 mcast_reprobes 0
     anycast_delay 1000 proxy_delay 800 proxy_queue 64 locktime 1000

 # ip ntable change name arp_cache dev dummy0 mcast_reprobes 5
 $ ip ntable show dev dummy0 name arp_cache
 inet arp_cache
     dev dummy0
     refcnt 1 reachable 43430 base_reachable 30000 retrans 1000
     gc_stale 60000 delay_probe 5000 queue 101
     app_probes 0 ucast_probes 3 mcast_probes 3 mcast_reprobes 5
     anycast_delay 1000 proxy_delay 800 proxy_queue 64 locktime 1000

 $ ip -j -p ntable show dev dummy0 name arp_cache
 [ {
         "family": "inet",
         "name": "arp_cache",
         "dev": "dummy0",
         "refcnt": 1,
         "reachable": 43430,
         "base_reachable": 30000,
         "retrans": 1000,
         "gc_stale": 60000,
         "delay_probe": 5000,
         "queue": 101,
         "app_probes": 0,
         "ucast_probes": 3,
         "mcast_probes": 3,
         "mcast_reprobes": 5,
         "anycast_delay": 1000,
         "proxy_delay": 800,
         "proxy_queue": 64,
         "locktime": 1000
     } ]

Signed-off-by: Ido Schimmel <idosch@...dia.com>
---
 ip/ipntable.c        | 21 ++++++++++++++++++++-
 man/man8/ip-ntable.8 |  2 ++
 2 files changed, 22 insertions(+), 1 deletion(-)

diff --git a/ip/ipntable.c b/ip/ipntable.c
index 4ce02a315fe1..54db9b62c837 100644
--- a/ip/ipntable.c
+++ b/ip/ipntable.c
@@ -40,7 +40,8 @@ static void usage(void)
 		"PARMS := [ base_reachable MSEC ] [ retrans MSEC ] [ gc_stale MSEC ]\n"
 		"         [ delay_probe MSEC ] [ queue LEN ]\n"
 		"         [ app_probes VAL ] [ ucast_probes VAL ] [ mcast_probes VAL ]\n"
-		"         [ anycast_delay MSEC ] [ proxy_delay MSEC ] [ proxy_queue LEN ]\n"
+		"         [ mcast_reprobes VAL ] [ anycast_delay MSEC ]\n"
+		"         [ proxy_delay MSEC ] [ proxy_queue LEN ]\n"
 		"         [ locktime MSEC ]\n"
 		);
 
@@ -223,6 +224,17 @@ static int ipntable_modify(int cmd, int flags, int argc, char **argv)
 			rta_addattr32(parms_rta, sizeof(parms_buf),
 				      NDTPA_MCAST_PROBES, mprobe);
 			parms_change = 1;
+		} else if (strcmp(*argv, "mcast_reprobes") == 0) {
+			__u32 mreprobe;
+
+			NEXT_ARG();
+
+			if (get_u32(&mreprobe, *argv, 0))
+				invarg("\"mcast_reprobes\" value is invalid", *argv);
+
+			rta_addattr32(parms_rta, sizeof(parms_buf),
+				      NDTPA_MCAST_REPROBES, mreprobe);
+			parms_change = 1;
 		} else if (strcmp(*argv, "anycast_delay") == 0) {
 			__u64 anycast_delay;
 
@@ -440,6 +452,13 @@ static void print_ndtparams(struct rtattr *tpb[])
 			   "mcast_probes %u ", mprobe);
 	}
 
+	if (tpb[NDTPA_MCAST_REPROBES]) {
+		__u32 mreprobe = rta_getattr_u32(tpb[NDTPA_MCAST_REPROBES]);
+
+		print_uint(PRINT_ANY, "mcast_reprobes",
+			   "mcast_reprobes %u ", mreprobe);
+	}
+
 	print_string(PRINT_FP, NULL, "%s    ", _SL_);
 
 	if (tpb[NDTPA_ANYCAST_DELAY]) {
diff --git a/man/man8/ip-ntable.8 b/man/man8/ip-ntable.8
index 4f0f2e548a21..56108afe6586 100644
--- a/man/man8/ip-ntable.8
+++ b/man/man8/ip-ntable.8
@@ -42,6 +42,8 @@ ip-ntable - neighbour table configuration
 .IR VAL " ] ["
 .B mcast_probes
 .IR VAL " ] ["
+.B mcast_reprobes
+.IR VAL " ] ["
 .B anycast_delay
 .IR MSEC " ] ["
 .B proxy_delay
-- 
2.49.0