patch 'fib: fix prefix addition handling' has been queued to stable release 24.11.5

[luca.boccassi at gmail.com]

Hi,

FYI, your patch has been queued to stable release 24.11.5

Note it hasn't been pushed to http://dpdk.org/browse/dpdk-stable yet.
It will be pushed if I get no objections before 02/22/26. 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/bluca/dpdk-stable

This queued commit can be viewed at:
https://github.com/bluca/dpdk-stable/commit/e91d20ac73ced98a27ea72df8e0e499af937b499

Thanks.

Luca Boccassi

---
>From e91d20ac73ced98a27ea72df8e0e499af937b499 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 c48d962d41..41ed6c072a 100644
--- a/lib/fib/dir24_8.c
+++ b/lib/fib/dir24_8.c
@@ -495,13 +495,14 @@ dir24_8_modify(struct rte_fib *fib, uint32_t ip, uint8_t depth,
 		if (parent != NULL) {
 			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);
 		if (ret != 0) {
 			rte_rib_remove(rib, ip, depth);
 			return ret;
 		}
+successfully_added:
 		if ((depth > 24) && (tmp == NULL))
 			dp->rsvd_tbl8s++;
 		return 0;
diff --git a/lib/fib/trie.c b/lib/fib/trie.c
index 24674276c4..dc7baa1e9f 100644
--- a/lib/fib/trie.c
+++ b/lib/fib/trie.c
@@ -586,14 +586,14 @@ trie_modify(struct rte_fib6 *fib, const struct rte_ipv6_addr *ip,
 		if (parent != NULL) {
 			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);
 		if (ret != 0) {
 			rte_rib6_remove(rib, &ip_masked, depth);
 			return ret;
 		}
-
+successfully_added:
 		dp->rsvd_tbl8s += depth_diff;
 		return 0;
 	case RTE_FIB6_DEL:
-- 
2.47.3

---
  Diff of the applied patch vs upstream commit (please double-check if non-empty:
---
--- -	2026-02-20 14:55:47.440430646 +0000
+++ 0111-fib-fix-prefix-addition-handling.patch	2026-02-20 14:55:43.376193990 +0000
@@ -1 +1 @@
-From 3ad9ad9e362b1c114dc6103ee5a1394048fd78c0 Mon Sep 17 00:00:00 2001
+From e91d20ac73ced98a27ea72df8e0e499af937b499 Mon Sep 17 00:00:00 2001
@@ -5,0 +6,2 @@
+[ upstream commit 3ad9ad9e362b1c114dc6103ee5a1394048fd78c0 ]
+
@@ -16 +17,0 @@
-Cc: stable at dpdk.org
@@ -25 +26 @@
-index 57594bb561..489d2ef427 100644
+index c48d962d41..41ed6c072a 100644
@@ -28 +29 @@
-@@ -516,13 +516,14 @@ dir24_8_modify(struct rte_fib *fib, uint32_t ip, uint8_t depth,
+@@ -495,13 +495,14 @@ dir24_8_modify(struct rte_fib *fib, uint32_t ip, uint8_t depth,
@@ -45 +46 @@
-index 9b56dd9588..fa5d9ec6b0 100644
+index 24674276c4..dc7baa1e9f 100644
@@ -48 +49 @@
-@@ -614,14 +614,14 @@ trie_modify(struct rte_fib6 *fib, const struct rte_ipv6_addr *ip,
+@@ -586,14 +586,14 @@ trie_modify(struct rte_fib6 *fib, const struct rte_ipv6_addr *ip,