Hi Lorenzo, I only have a couple of minor grammatical suggestions for the docs. See below.

On 7/13/22 08:44, Lorenzo Bianconi wrote:
check_ecmp_nh_mac/check_ecmp_nh actions check if the packet under
consideration matches the any flow in table
OFTABLE_ECMP_NH_MAC/OFTABLE_ECMP_NH. If it is so, then the 1-bit
destination register is set to 1.
chk_ecmp_nh and chk_ecmp_nh_mac will be used to improve ECMP symmetric
routing reliability.

Signed-off-by: Lorenzo Bianconi <[email protected]>
---
  include/ovn/actions.h |  2 ++
  lib/actions.c         | 54 +++++++++++++++++++++++++++++++++++++++++++
  ovn-sb.xml            | 20 ++++++++++++++++
  utilities/ovn-trace.c |  4 ++++
  4 files changed, 80 insertions(+)

diff --git a/include/ovn/actions.h b/include/ovn/actions.h
index cef930e1a..4a3b9195a 100644
--- a/include/ovn/actions.h
+++ b/include/ovn/actions.h
@@ -119,6 +119,8 @@ struct ovn_extend_table;
      OVNACT(CHECK_IN_PORT_SEC,  ovnact_result)         \
      OVNACT(CHECK_OUT_PORT_SEC, ovnact_result)         \
      OVNACT(COMMIT_ECMP_NH,    ovnact_commit_ecmp_nh)  \
+    OVNACT(CHK_ECMP_NH_MAC,   ovnact_result)          \
+    OVNACT(CHK_ECMP_NH,       ovnact_result)          \
/* enum ovnact_type, with a member OVNACT_<ENUM> for each action. */
  enum OVS_PACKED_ENUM ovnact_type {
diff --git a/lib/actions.c b/lib/actions.c
index 132c63228..e941f3cb4 100644
--- a/lib/actions.c
+++ b/lib/actions.c
@@ -4452,6 +4452,52 @@ encode_COMMIT_ECMP_NH(const struct ovnact_commit_ecmp_nh 
*ecmp_nh,
       commit_ecmp_learn_action(ofpacts, false, ecmp_nh->ipv6);
  }
+static void
+parse_chk_ecmp_nh_mac(struct action_context *ctx, const struct expr_field *dst,
+                      struct ovnact_result *res)
+{
+    parse_ovnact_result(ctx, "chk_ecmp_nh_mac", NULL, dst, res);
+}
+
+static void
+format_CHK_ECMP_NH_MAC(const struct ovnact_result *res, struct ds *s)
+{
+    expr_field_format(&res->dst, s);
+    ds_put_cstr(s, " = chk_ecmp_nh_mac();");
+}
+
+static void
+encode_CHK_ECMP_NH_MAC(const struct ovnact_result *res,
+                       const struct ovnact_encode_params *ep OVS_UNUSED,
+                       struct ofpbuf *ofpacts)
+{
+    encode_result_action__(res, OFTABLE_ECMP_NH_MAC,
+                           MLF_LOOKUP_COMMIT_ECMP_NH_BIT, ofpacts);
+}
+
+static void
+parse_chk_ecmp_nh(struct action_context *ctx, const struct expr_field *dst,
+                  struct ovnact_result *res)
+{
+    parse_ovnact_result(ctx, "chk_ecmp_nh", NULL, dst, res);
+}
+
+static void
+format_CHK_ECMP_NH(const struct ovnact_result *res, struct ds *s)
+{
+    expr_field_format(&res->dst, s);
+    ds_put_cstr(s, " = chk_ecmp_nh();");
+}
+
+static void
+encode_CHK_ECMP_NH(const struct ovnact_result *res,
+                   const struct ovnact_encode_params *ep OVS_UNUSED,
+                   struct ofpbuf *ofpacts)
+{
+    encode_result_action__(res, OFTABLE_ECMP_NH,
+                           MLF_LOOKUP_COMMIT_ECMP_NH_BIT, ofpacts);
+}
+
  /* Parses an assignment or exchange or put_dhcp_opts action. */
  static void
  parse_set_action(struct action_context *ctx)
@@ -4528,6 +4574,14 @@ parse_set_action(struct action_context *ctx)
                     && lexer_lookahead(ctx->lexer) == LEX_T_LPAREN) {
              parse_check_out_port_sec(
                  ctx, &lhs, ovnact_put_CHECK_OUT_PORT_SEC(ctx->ovnacts));
+        } else if (!strcmp(ctx->lexer->token.s, "chk_ecmp_nh_mac")
+                   && lexer_lookahead(ctx->lexer) == LEX_T_LPAREN) {
+            parse_chk_ecmp_nh_mac(ctx, &lhs,
+                    ovnact_put_CHK_ECMP_NH_MAC(ctx->ovnacts));
+        } else if (!strcmp(ctx->lexer->token.s, "chk_ecmp_nh")
+                   && lexer_lookahead(ctx->lexer) == LEX_T_LPAREN) {
+            parse_chk_ecmp_nh(ctx, &lhs,
+                    ovnact_put_CHK_ECMP_NH(ctx->ovnacts));
          } else {
              parse_assignment_action(ctx, false, &lhs);
          }
diff --git a/ovn-sb.xml b/ovn-sb.xml
index ef5586020..dfed06e95 100644
--- a/ovn-sb.xml
+++ b/ovn-sb.xml
@@ -2607,6 +2607,26 @@ tcp.flags = RST;
              if it is routed via an ECMP route
            </p>
          </dd>
+
+        <dt><code><var>R</var> = check_ecmp_nh_mac();</code></dt>
+        <dd>
+          <p>
+            This action checks if the packet under consideration matches
+            the any flow in table <code>OFTABLE_ECMP_NH_MAC</code>.

s/the //

+            If it is so, then the 1-bit destination register <var>R</var>
+            is set to 1.
+          </p>
+        </dd>
+
+        <dt><code><var>R</var> = check_ecmp_nh();</code></dt>
+        <dd>
+          <p>
+            This action checks if the packet under consideration matches
+            the any flow in table <code>OFTABLE_ECMP_NH</code>.

s/the //

+            If it is so, then the 1-bit destination register <var>R</var>
+            is set to 1.
+          </p>
+        </dd>
        </dl>
      </column>
diff --git a/utilities/ovn-trace.c b/utilities/ovn-trace.c
index fd84a1a5e..14daff672 100644
--- a/utilities/ovn-trace.c
+++ b/utilities/ovn-trace.c
@@ -3226,6 +3226,10 @@ trace_actions(const struct ovnact *ovnacts, size_t 
ovnacts_len,
              break;
          case OVNACT_COMMIT_ECMP_NH:
              break;
+        case OVNACT_CHK_ECMP_NH_MAC:
+            break;
+        case OVNACT_CHK_ECMP_NH:
+            break;
          }
      }
      ofpbuf_uninit(&stack);


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