Excellent. I tried to make it angry but it remained calm no matter what I threw at it. The only "flaw" is that if you add just one route with "--ecmp" then it will not display "ecmp" when you list the route. ovn-northd doesn't do any special ECMP handling with this single route, either, so the output is accurate in this case, even if possibly unexpected.

Acked-by: Mark Michelson <[email protected]>

On 1/18/21 11:22 AM, Lorenzo Bianconi wrote:
Explicitly add ecmp/ecmp-symmetric-reply info to ovn-nbctl
lr-route-list command

https://bugzilla.redhat.com/show_bug.cgi?id=1915958

Signed-off-by: Lorenzo Bianconi <[email protected]>
---
This patch is based on "ovn-nbctl: add bfd report to lr-route-list command"
http://patchwork.ozlabs.org/project/ovn/list/?series=224464
---
  tests/ovn-nbctl.at    | 36 ++++++++++++++---------
  utilities/ovn-nbctl.c | 67 +++++++++++++++++++++++++++++++++++--------
  2 files changed, 78 insertions(+), 25 deletions(-)

diff --git a/tests/ovn-nbctl.at b/tests/ovn-nbctl.at
index 2827b223c..e4a2a9695 100644
--- a/tests/ovn-nbctl.at
+++ b/tests/ovn-nbctl.at
@@ -1544,27 +1544,27 @@ AT_CHECK([ovn-nbctl --ecmp lr-route-add lr0 10.0.0.0/24 
11.0.0.3])
  AT_CHECK([ovn-nbctl --ecmp lr-route-add lr0 10.0.0.0/24 11.0.0.3 lp0])
  AT_CHECK([ovn-nbctl lr-route-list lr0], [0], [dnl
  IPv4 Routes
-              10.0.0.0/24                  11.0.0.1 dst-ip
-              10.0.0.0/24                  11.0.0.2 dst-ip
-              10.0.0.0/24                  11.0.0.2 dst-ip
-              10.0.0.0/24                  11.0.0.3 dst-ip
-              10.0.0.0/24                  11.0.0.3 dst-ip lp0
+              10.0.0.0/24                  11.0.0.1 dst-ip ecmp
+              10.0.0.0/24                  11.0.0.2 dst-ip ecmp
+              10.0.0.0/24                  11.0.0.2 dst-ip ecmp
+              10.0.0.0/24                  11.0.0.3 dst-ip ecmp
+              10.0.0.0/24                  11.0.0.3 dst-ip lp0 ecmp
  ])
dnl Delete ecmp routes
  AT_CHECK([ovn-nbctl lr-route-del lr0 10.0.0.0/24 11.0.0.1])
  AT_CHECK([ovn-nbctl lr-route-list lr0], [0], [dnl
  IPv4 Routes
-              10.0.0.0/24                  11.0.0.2 dst-ip
-              10.0.0.0/24                  11.0.0.2 dst-ip
-              10.0.0.0/24                  11.0.0.3 dst-ip
-              10.0.0.0/24                  11.0.0.3 dst-ip lp0
+              10.0.0.0/24                  11.0.0.2 dst-ip ecmp
+              10.0.0.0/24                  11.0.0.2 dst-ip ecmp
+              10.0.0.0/24                  11.0.0.3 dst-ip ecmp
+              10.0.0.0/24                  11.0.0.3 dst-ip lp0 ecmp
  ])
  AT_CHECK([ovn-nbctl lr-route-del lr0 10.0.0.0/24 11.0.0.2])
  AT_CHECK([ovn-nbctl lr-route-list lr0], [0], [dnl
  IPv4 Routes
-              10.0.0.0/24                  11.0.0.3 dst-ip
-              10.0.0.0/24                  11.0.0.3 dst-ip lp0
+              10.0.0.0/24                  11.0.0.3 dst-ip ecmp
+              10.0.0.0/24                  11.0.0.3 dst-ip lp0 ecmp
  ])
  AT_CHECK([ovn-nbctl lr-route-del lr0 10.0.0.0/24 11.0.0.3 lp0])
  AT_CHECK([ovn-nbctl lr-route-list lr0], [0], [dnl
@@ -1605,7 +1605,12 @@ AT_CHECK([ovn-nbctl lr-route-add lr0 10.0.1.1/24 
11.0.1.1 lp0])
  AT_CHECK([ovn-nbctl lr-route-add lr0 10.0.0.1/24 11.0.0.1])
  AT_CHECK([ovn-nbctl lr-route-add lr0 0:0:0:0:0:0:0:0/0 2001:0db8:0:f101::1])
  AT_CHECK([ovn-nbctl lr-route-add lr0 2001:0db8:0::/64 2001:0db8:0:f102::1 
lp0])
-AT_CHECK([ovn-nbctl lr-route-add lr0 2001:0db8:1::/64 2001:0db8:0:f103::1])
+AT_CHECK([ovn-nbctl --ecmp lr-route-add lr0 2001:0db8:1::/64 
2001:0db8:0:f103::1])
+AT_CHECK([ovn-nbctl --ecmp lr-route-add lr0 2001:0db8:1::/64 
2001:0db8:0:f103::2])
+AT_CHECK([ovn-nbctl --ecmp lr-route-add lr0 2001:0db8:1::/64 
2001:0db8:0:f103::3])
+AT_CHECK([ovn-nbctl --ecmp lr-route-add lr0 2001:0db8:1::/64 
2001:0db8:0:f103::4])
+AT_CHECK([ovn-nbctl lr-route-add lr0 2002:0db8:1::/64 2001:0db8:0:f103::5])
+AT_CHECK([ovn-nbctl --ecmp-symmetric-reply lr-route-add lr0 2003:0db8:1::/64 
2001:0db8:0:f103::6])
AT_CHECK([ovn-nbctl lr-route-list lr0], [0], [dnl
  IPv4 Routes
@@ -1615,7 +1620,12 @@ IPv4 Routes
IPv6 Routes
              2001:db8::/64        2001:db8:0:f102::1 dst-ip lp0
-          2001:db8:1::/64        2001:db8:0:f103::1 dst-ip
+          2001:db8:1::/64        2001:db8:0:f103::1 dst-ip ecmp
+          2001:db8:1::/64        2001:db8:0:f103::2 dst-ip ecmp
+          2001:db8:1::/64        2001:db8:0:f103::3 dst-ip ecmp
+          2001:db8:1::/64        2001:db8:0:f103::4 dst-ip ecmp
+          2002:db8:1::/64        2001:db8:0:f103::5 dst-ip
+          2003:db8:1::/64        2001:db8:0:f103::6 dst-ip ecmp-symmetric-reply
                       ::/0        2001:db8:0:f101::1 dst-ip
  ])
diff --git a/utilities/ovn-nbctl.c b/utilities/ovn-nbctl.c
index abd138313..f43967477 100644
--- a/utilities/ovn-nbctl.c
+++ b/utilities/ovn-nbctl.c
@@ -5443,17 +5443,27 @@ struct ipv4_route {
      const struct nbrec_logical_router_static_route *route;
  };
+static int
+__ipv4_route_cmp(const struct ipv4_route *r1, const struct ipv4_route *r2)
+{
+    if (r1->priority != r2->priority) {
+        return r1->priority > r2->priority ? -1 : 1;
+    }
+    if (r1->addr != r2->addr) {
+        return ntohl(r1->addr) < ntohl(r2->addr) ? -1 : 1;
+    }
+    return 0;
+}
+
  static int
  ipv4_route_cmp(const void *route1_, const void *route2_)
  {
      const struct ipv4_route *route1p = route1_;
      const struct ipv4_route *route2p = route2_;
- if (route1p->priority != route2p->priority) {
-        return route1p->priority > route2p->priority ? -1 : 1;
-    }
-    if (route1p->addr != route2p->addr) {
-        return ntohl(route1p->addr) < ntohl(route2p->addr) ? -1 : 1;
+    int ret = __ipv4_route_cmp(route1p, route2p);
+    if (ret) {
+        return ret;
      }
      return route_cmp_details(route1p->route, route2p->route);
  }
@@ -5464,16 +5474,22 @@ struct ipv6_route {
      const struct nbrec_logical_router_static_route *route;
  };
+static int
+__ipv6_route_cmp(const struct ipv6_route *r1, const struct ipv6_route *r2)
+{
+    if (r1->priority != r2->priority) {
+        return r1->priority > r2->priority ? -1 : 1;
+    }
+    return memcmp(&r1->addr, &r2->addr, sizeof(r1->addr));
+}
+
  static int
  ipv6_route_cmp(const void *route1_, const void *route2_)
  {
      const struct ipv6_route *route1p = route1_;
      const struct ipv6_route *route2p = route2_;
- if (route1p->priority != route2p->priority) {
-        return route1p->priority > route2p->priority ? -1 : 1;
-    }
-    int ret = memcmp(&route1p->addr, &route2p->addr, sizeof(route1p->addr));
+    int ret = __ipv6_route_cmp(route1p, route2p);
      if (ret) {
          return ret;
      }
@@ -5481,7 +5497,8 @@ ipv6_route_cmp(const void *route1_, const void *route2_)
  }
static void
-print_route(const struct nbrec_logical_router_static_route *route, struct ds 
*s)
+print_route(const struct nbrec_logical_router_static_route *route,
+            struct ds *s, bool ecmp)
  {
char *prefix = normalize_prefix_str(route->ip_prefix);
@@ -5504,6 +5521,14 @@ print_route(const struct 
nbrec_logical_router_static_route *route, struct ds *s)
          ds_put_format(s, " (learned)");
      }
+ if (ecmp) {
+        ds_put_format(s, " %s", "ecmp");
+    }
+
+    if (smap_get_bool(&route->options, "ecmp_symmetric_reply", false)) {
+        ds_put_format(s, " %s", "ecmp-symmetric-reply");
+    }
+
      if (route->bfd) {
          ds_put_format(s, " %s", "bfd");
      }
@@ -5573,7 +5598,16 @@ nbctl_lr_route_list(struct ctl_context *ctx)
          ds_put_cstr(&ctx->output, "IPv4 Routes\n");
      }
      for (int i = 0; i < n_ipv4_routes; i++) {
-        print_route(ipv4_routes[i].route, &ctx->output);
+        bool ecmp = false;
+        if (i < n_ipv4_routes - 1 &&
+            !__ipv4_route_cmp(&ipv4_routes[i], &ipv4_routes[i + 1])) {
+            ecmp = true;
+        } else if (i > 0 &&
+                   !__ipv4_route_cmp(&ipv4_routes[i],
+                                     &ipv4_routes[i - 1])) {
+            ecmp = true;
+        }
+        print_route(ipv4_routes[i].route, &ctx->output, ecmp);
      }
if (n_ipv6_routes) {
@@ -5581,7 +5615,16 @@ nbctl_lr_route_list(struct ctl_context *ctx)
                        n_ipv4_routes ?  "\n" : "");
      }
      for (int i = 0; i < n_ipv6_routes; i++) {
-        print_route(ipv6_routes[i].route, &ctx->output);
+        bool ecmp = false;
+        if (i < n_ipv6_routes - 1 &&
+            !__ipv6_route_cmp(&ipv6_routes[i], &ipv6_routes[i + 1])) {
+            ecmp = true;
+        } else if (i > 0 &&
+                   !__ipv6_route_cmp(&ipv6_routes[i],
+                                     &ipv6_routes[i - 1])) {
+            ecmp = true;
+        }
+        print_route(ipv6_routes[i].route, &ctx->output, ecmp);
      }
free(ipv4_routes);


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