On 09/09/2020 12:20, Ilya Maximets wrote:
On 9/9/20 11:02 AM, [email protected] wrote:
From: Anton Ivanov <[email protected]>

Replaces ds_put_cstr and ds_put_format which evaluate to
constant expressions with string constants

Signed-off-by: Anton Ivanov <[email protected]>
---

Hi.  Thanks for the fix!

One general comment to almost all of your patches:
Please, use the following format for the patch subject:
   <area>: Summary.
i.e. add an <area>: part that should represent a piece of code this patch
is targeted to.  For example, it should be 'ovn-northd:' for this patch.
And it's also better to end the patch subject with a period.  You already
starting the summary with a capital letter, so this  part is fine.

https://docs.ovn.org/en/latest/internals/contributing/submitting-patches.html#email-subject

Some comments for the patch inline.

Cool. I will address them in the next revision. I found one more case of constant format as well.


Best regards, Ilya Maximets.

  northd/ovn-northd.c | 56 ++++++++++++++++++++++-----------------------
  1 file changed, 28 insertions(+), 28 deletions(-)

diff --git a/northd/ovn-northd.c b/northd/ovn-northd.c
index 3de71612b..c681d5cbf 100644
--- a/northd/ovn-northd.c
+++ b/northd/ovn-northd.c
@@ -1928,6 +1928,8 @@ update_dynamic_addresses(struct dynamic_address_update 
*update)
struct ds new_addr = DS_EMPTY_INITIALIZER;
      ds_put_format(&new_addr, ETH_ADDR_FMT, ETH_ADDR_ARGS(mac));
+
+

This is totally unrelated and not needed.

      ipam_insert_mac(&mac, true);
if (ip4) {
@@ -6950,24 +6952,24 @@ build_lswitch_flows(struct hmap *datapaths, struct hmap 
*ports,
          struct ds action = DS_EMPTY_INITIALIZER;
ds_clear(&match);

No need to clear.

-        ds_put_cstr(&match, "udp.dst == 53");
+        const char *dns_match = "udp.dst == 53";

It might be better to just pass this string directly  to the ovn_lflow_add.

          ds_put_format(&action,
                        REGBIT_DNS_LOOKUP_RESULT" = dns_lookup(); next;");
          ovn_lflow_add(lflows, od, S_SWITCH_IN_DNS_LOOKUP, 100,
-                      ds_cstr(&match), ds_cstr(&action));
+                      dns_match, ds_cstr(&action));
          ds_clear(&action);
-        ds_put_cstr(&match, " && "REGBIT_DNS_LOOKUP_RESULT);
-        ds_put_format(&action, "eth.dst <-> eth.src; ip4.src <-> ip4.dst; "
+
+        const char *dns_match2 = "udp.dst == 53 && "REGBIT_DNS_LOOKUP_RESULT;

Please, declare a single variable once for both cases at the top of the block.

+        const char *dns_action = "eth.dst <-> eth.src; ip4.src <-> ip4.dst; "

And this block is not big, so , please, declare this variable at the top of the
block too.

                        "udp.dst = udp.src; udp.src = 53; outport = inport; "
-                      "flags.loopback = 1; output;");
+                      "flags.loopback = 1; output;";
          ovn_lflow_add(lflows, od, S_SWITCH_IN_DNS_RESPONSE, 100,
-                      ds_cstr(&match), ds_cstr(&action));
-        ds_clear(&action);
-        ds_put_format(&action, "eth.dst <-> eth.src; ip6.src <-> ip6.dst; "
+                      dns_match2, dns_action);
+        dns_action = "eth.dst <-> eth.src; ip6.src <-> ip6.dst; "
                        "udp.dst = udp.src; udp.src = 53; outport = inport; "
-                      "flags.loopback = 1; output;");
+                      "flags.loopback = 1; output;";
          ovn_lflow_add(lflows, od, S_SWITCH_IN_DNS_RESPONSE, 100,
-                      ds_cstr(&match), ds_cstr(&action));
+                      dns_match2, dns_action);
          ds_destroy(&action);
      }
@@ -7839,10 +7841,10 @@ add_ecmp_symmetric_reply_flows(struct hmap *lflows,
                              &st_route->header_);
ds_clear(&actions);

No more need to clear.

-    ds_put_cstr(&actions, "eth.dst = ct_label.ecmp_reply_eth; next;");
+    const char *action = "eth.dst = ct_label.ecmp_reply_eth; next;";

It might be better to just pass this string directly  to the function below,
i.e. without any intermediate variables.

      ovn_lflow_add_with_hint(lflows, od, S_ROUTER_IN_ARP_RESOLVE,
                              200, ds_cstr(&ecmp_reply),
-                            ds_cstr(&actions), &st_route->header_);
+                            action, &st_route->header_);
  }
static void
@@ -8734,9 +8736,9 @@ build_lrouter_flows(struct hmap *datapaths, struct hmap 
*ports,
/* TTL discard */
          ds_clear(&match);

No more need to clear.

-        ds_put_cstr(&match, "ip4 && ip.ttl == {0, 1}");
+        const char *ttl_match = "ip4 && ip.ttl == {0, 1}";

Ditto.

          ovn_lflow_add(lflows, od, S_ROUTER_IN_IP_INPUT, 30,
-                      ds_cstr(&match), "drop;");
+                      ttl_match, "drop;");
/* Pass other traffic not already handled to the next table for
           * routing. */
@@ -8778,14 +8780,13 @@ build_lrouter_flows(struct hmap *datapaths, struct hmap 
*ports,
              ds_put_cstr(&match, " && icmp4.type == 8 && icmp4.code == 0");
ds_clear(&actions);

No more need to clear.

-            ds_put_format(&actions,
-                "ip4.dst <-> ip4.src; "
-                "ip.ttl = 255; "
-                "icmp4.type = 0; "
-                "flags.loopback = 1; "
-                "next; ");
+            const char * icmp_actions = "ip4.dst <-> ip4.src; "
+                                    "ip.ttl = 255; "
+                                    "icmp4.type = 0; "
+                                    "flags.loopback = 1; "
+                                    "next; ";

Since you're shifting these lines please align them with the first one,
i.e. 4 more spaces to the right.

BTW, it's kind of inconsistent that you're shifting these lines here and
not shifting in a change below.  It might make sense to not shift at all.

              ovn_lflow_add_with_hint(lflows, op->od, S_ROUTER_IN_IP_INPUT, 90,
-                                    ds_cstr(&match), ds_cstr(&actions),
+                                    ds_cstr(&match), icmp_actions,
                                      &op->nbrp->header_);
          }
@@ -9184,14 +9185,14 @@ build_lrouter_flows(struct hmap *datapaths, struct hmap *ports,
              ds_put_cstr(&match, " && icmp6.type == 128 && icmp6.code == 0");
ds_clear(&actions);

No more need to clear.

-            ds_put_cstr(&actions,
+            const char *lrp_actions =
                          "ip6.dst <-> ip6.src; "
                          "ip.ttl = 255; "
                          "icmp6.type = 129; "
                          "flags.loopback = 1; "
-                        "next; ");
+                        "next; ";
              ovn_lflow_add_with_hint(lflows, op->od, S_ROUTER_IN_IP_INPUT, 90,
-                                    ds_cstr(&match), ds_cstr(&actions),
+                                    ds_cstr(&match), lrp_actions,
                                      &op->nbrp->header_);
          }
@@ -10449,13 +10450,12 @@ build_lrouter_flows(struct hmap *datapaths, struct hmap *ports,
                                        REG_NEXT_HOP_IPV4 " == %s",
                                        peer->json_key, vip);
- ds_clear(&actions);
-                        ds_put_format(&actions,
-                                      "eth.dst = 00:00:00:00:00:00; next;");
+                        const char *arp_actions =
+                                      "eth.dst = 00:00:00:00:00:00; next;";
                          ovn_lflow_add_with_hint(lflows, peer->od,
                                                  S_ROUTER_IN_ARP_RESOLVE, 100,
                                                  ds_cstr(&match),
-                                                ds_cstr(&actions),
+                                                arp_actions,
                                                  &op->nbsp->header_);
                          break;
                      }





--
Anton R. Ivanov
Cambridgegreys Limited. Registered in England. Company Number 10273661
https://www.cambridgegreys.com/
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