patch 'fib: fix prefix addition handling' has been queued to stable release 25.11.1

[Kevin Traynor]

Hi,

FYI, your patch has been queued to stable release 25.11.1

Note it hasn't been pushed to http://dpdk.org/browse/dpdk-stable yet.
It will be pushed if I get no objections before 03/02/26. So please
shout if anyone has objections.

Also note that after the patch there's a diff of the upstream commit vs the
patch applied to the branch. This will indicate if there was any rebasing
needed to apply to the stable branch. If there were code changes for rebasing
(ie: not only metadata diffs), please double check that the rebase was
correctly done.

Queued patches are on a temporary branch at:
https://github.com/kevintraynor/dpdk-stable

This queued commit can be viewed at:
https://github.com/kevintraynor/dpdk-stable/commit/10843847c3933dae30d433c206188603f9807e97

Thanks.

Kevin

---
>From 10843847c3933dae30d433c206188603f9807e97 Mon Sep 17 00:00:00 2001
From: Vladimir Medvedkin <vladimir.medvedkin at intel.com>
Date: Wed, 21 Jan 2026 17:57:01 +0000
Subject: [PATCH] fib: fix prefix addition handling

[ upstream commit 3ad9ad9e362b1c114dc6103ee5a1394048fd78c0 ]

When adding a prefix longer than /24 in FIB/FIB6 as a first prefix within
its corresponding /24 supernet with the same next hop as its parent, the
code would incorrectly skip incrementing the number of reserved TBL8 due
to an early return statement. This could lead to integer overflow in
'dp->rsvd_tbl8s'. This commit corrects the logic to ensure that the
reserved TBL8 count is properly incremented in such scenarios.

Bugzilla ID: 1731
Fixes: 7dc7868b200d ("fib: add DIR24-8 dataplane algorithm")
Fixes: c3e12e0f0354 ("fib: add dataplane algorithm for IPv6")

Signed-off-by: Vladimir Medvedkin <vladimir.medvedkin at intel.com>
---
 lib/fib/dir24_8.c | 3 ++-
 lib/fib/trie.c    | 4 ++--
 2 files changed, 4 insertions(+), 3 deletions(-)

diff --git a/lib/fib/dir24_8.c b/lib/fib/dir24_8.c
index 57594bb561..489d2ef427 100644
--- a/lib/fib/dir24_8.c
+++ b/lib/fib/dir24_8.c
@@ -517,5 +517,5 @@ dir24_8_modify(struct rte_fib *fib, uint32_t ip, uint8_t depth,
 			rte_rib_get_nh(parent, &par_nh);
 			if (par_nh == next_hop)
-				return 0;
+				goto successfully_added;
 		}
 		ret = modify_fib(dp, rib, ip, depth, next_hop);
@@ -524,4 +524,5 @@ dir24_8_modify(struct rte_fib *fib, uint32_t ip, uint8_t depth,
 			return ret;
 		}
+successfully_added:
 		if ((depth > 24) && (tmp == NULL))
 			dp->rsvd_tbl8s++;
diff --git a/lib/fib/trie.c b/lib/fib/trie.c
index 9b56dd9588..fa5d9ec6b0 100644
--- a/lib/fib/trie.c
+++ b/lib/fib/trie.c
@@ -615,5 +615,5 @@ trie_modify(struct rte_fib6 *fib, const struct rte_ipv6_addr *ip,
 			rte_rib6_get_nh(parent, &par_nh);
 			if (par_nh == next_hop)
-				return 0;
+				goto successfully_added;
 		}
 		ret = modify_dp(dp, rib, &ip_masked, depth, next_hop);
@@ -622,5 +622,5 @@ trie_modify(struct rte_fib6 *fib, const struct rte_ipv6_addr *ip,
 			return ret;
 		}
-
+successfully_added:
 		dp->rsvd_tbl8s += depth_diff;
 		return 0;
-- 
2.53.0

---
  Diff of the applied patch vs upstream commit (please double-check if non-empty:
---
--- -	2026-02-26 10:16:52.571568655 +0000
+++ 0142-fib-fix-prefix-addition-handling.patch	2026-02-26 10:16:47.212460378 +0000
@@ -1 +1 @@
-From 3ad9ad9e362b1c114dc6103ee5a1394048fd78c0 Mon Sep 17 00:00:00 2001
+From 10843847c3933dae30d433c206188603f9807e97 Mon Sep 17 00:00:00 2001
@@ -5,0 +6,2 @@
+[ upstream commit 3ad9ad9e362b1c114dc6103ee5a1394048fd78c0 ]
+
@@ -16 +17,0 @@
-Cc: stable at dpdk.org