[PATCH]: Update FRR patch 0009 to avoid inappropriate error messages (#12912)

Why I did it
As described in detail in #12753, the current FRR patch 0009-ignore-route-from-default-table.patch is causing unwanted FRR/zebra error logs. This change gets rid of the error messages for routes from kernel default table while these routes are ignored in prefix encoding.

How I did it
This fix updates the original 0009 patch by checking if the routes are from table default before printing the error logs. The original patch checks the same condition and ignores the routes from table default in prefix encoding.

How to verify it
Follow the steps to repro as described in #12753.
Also verify the test case ipfwd/test_nhop_count.py no longer fails due to the error messages.

Signed-off-by: Stephen Xu <[email protected]>

Author: Stephenxf

src/sonic-frr/patch/0009-ignore-route-from-default-table.patch

@@ -1,19 +1,46 @@
-From bb3b003840959adf5b5be52e91bc798007c9857a Mon Sep 17 00:00:00 2001
-From: Ying Xie <[email protected]>
-Date: Thu, 8 Sep 2022 04:20:36 +0000
-Subject: [PATCH] From 776a29e8ab32c1364ee601a8730aabb773b0c86b Mon Sep 17
- 00:00:00 2001 Subject: [PATCH] ignore route from default table
+commit 8b78a43ba243df281f2096a84893ad87cb2a79ff
+Author: Stephen Xu <[email protected]>
+Date:   Wed Nov 16 16:07:37 2022 -0500
 
-Signed-off-by: Ying Xie <[email protected]>
----
- zebra/zebra_fpm_netlink.c | 5 +++++
- 1 file changed, 5 insertions(+)
+    [PATCH] ignore route from default table
 
+    Signed-off-by: Stephen Xu <[email protected]>
+
+diff --git a/zebra/zebra_fpm.c b/zebra/zebra_fpm.c
+index 43958fdfd..de7e246d4 100644
+--- a/zebra/zebra_fpm.c
++++ b/zebra/zebra_fpm.c
+@@ -25,6 +25,7 @@
+ 
+ #include "log.h"
+ #include "libfrr.h"
++#include "rib.h"
+ #include "stream.h"
+ #include "thread.h"
+ #include "network.h"
+@@ -1016,8 +1017,15 @@ static int zfpm_build_route_updates(void)
+ 				else
+ 					zfpm_g->stats.route_dels++;
+ 			} else {
+-				zlog_err("%s: Encoding Prefix: %pRN No valid nexthops",
+-					 __func__, dest->rnode);
++				struct rib_table_info *table_info =
++				    rib_table_info(rib_dest_table(dest));
++				if (table_info && table_info->table_id == RT_TABLE_DEFAULT) {
++					zfpm_debug("%s: Skip encoding default table prefix: %pRN",
++						   __func__, dest->rnode);
++				} else {
++					zlog_err("%s: Encoding Prefix: %pRN No valid nexthops",
++						 __func__, dest->rnode);
++				}
+ 			}
+ 		}
+ 
 diff --git a/zebra/zebra_fpm_netlink.c b/zebra/zebra_fpm_netlink.c
-index 34be9fb39..d6c875a7e 100644
+index ec22c5dd4..53e5f59fb 100644
 --- a/zebra/zebra_fpm_netlink.c
 +++ b/zebra/zebra_fpm_netlink.c
-@@ -283,6 +283,11 @@ static int netlink_route_info_fill(struct netlink_route_info *ri, int cmd,
+@@ -278,6 +278,11 @@ static int netlink_route_info_fill(struct netlink_route_info *ri, int cmd,
  		rib_table_info(rib_dest_table(dest));
  	struct zebra_vrf *zvrf = table_info->zvrf;
 
@@ -25,6 +52,3 @@ index 34be9fb39..d6c875a7e 100644
  	memset(ri, 0, sizeof(*ri));
 
  	ri->prefix = rib_dest_prefix(dest);
--- 
-2.17.1
-