diff mbox series

[ovs-dev,v2.12] OVN: Combine conjunctions with identical matches into one flow.

Message ID 20191028212417.2426-1-mmichels@redhat.com
State Accepted
Commit 764df790b95aa4e6bf035d4b3ca14e8800c71368
Headers show
Series [ovs-dev,v2.12] OVN: Combine conjunctions with identical matches into one flow. | expand

Commit Message

Mark Michelson Oct. 28, 2019, 9:24 p.m. UTC
This is a backport of commit e659bab31a916d540411c93ca7125011b2e82b5c
from OVN master.

Conjunctive matches have an issue where it is possible to install
multiple flows that have identical matches. This results in ambiguity,
and can lead to features (such as ACLs) not functioning properly.

This change fixes the problem by combining conjunctions with identical
matches into a single flow. As an example, in the past we may have had
something like:

nw_dst=10.0.0.1 actions=conjunction(2,1/2)
nw_dst=10.0.0.1 actions=conjunction(3,1/2)

This commit changes this into

nw_dst=10.0.0.1 actions=conjunction(2,1/2),conjunction(3,1/2)

This way, there is only a single flow with the proscribed match, and
there is no ambiguity.

Signed-off-by: Mark Michelson <mmichels@redhat.com>
Acked-by: Numan Siddique <nusiddiq@redhat.com>
---
 ovn/controller/lflow.c  |  5 ++--
 ovn/controller/ofctrl.c | 74 ++++++++++++++++++++++++++++++++++++++++++-------
 ovn/controller/ofctrl.h |  6 ++++
 tests/ovn.at            | 17 +++++-------
 4 files changed, 80 insertions(+), 22 deletions(-)

Comments

0-day Robot Oct. 28, 2019, 10:08 p.m. UTC | #1
Bleep bloop.  Greetings Mark Michelson, I am a robot and I have tried out your patch.
Thanks for your contribution.

I encountered some error that I wasn't expecting.  See the details below.


git-am:
Failed to merge in the changes.
Patch failed at 0001 OVN: Combine conjunctions with identical matches into one flow.
The copy of the patch that failed is found in:
   /var/lib/jenkins/jobs/upstream_build_from_pw/workspace/.git/rebase-apply/patch
When you have resolved this problem, run "git am --resolved".
If you prefer to skip this patch, run "git am --skip" instead.
To restore the original branch and stop patching, run "git am --abort".


Please check this out.  If you feel there has been an error, please email aconole@redhat.com

Thanks,
0-day Robot
Maciej Jozefczyk Feb. 26, 2020, 4:11 p.m. UTC | #2
Hello,

Can I ask you to verify this patch and apply it on branch-2.12, please?
We recently are having issues with Openstack gates because this patch is
missing in branch-2.12

Thanks in advance!
Maciej

On Mon, Oct 28, 2019 at 11:10 PM 0-day Robot <robot@bytheb.org> wrote:

> Bleep bloop.  Greetings Mark Michelson, I am a robot and I have tried out
> your patch.
> Thanks for your contribution.
>
> I encountered some error that I wasn't expecting.  See the details below.
>
>
> git-am:
> Failed to merge in the changes.
> Patch failed at 0001 OVN: Combine conjunctions with identical matches into
> one flow.
> The copy of the patch that failed is found in:
>
>  /var/lib/jenkins/jobs/upstream_build_from_pw/workspace/.git/rebase-apply/patch
> When you have resolved this problem, run "git am --resolved".
> If you prefer to skip this patch, run "git am --skip" instead.
> To restore the original branch and stop patching, run "git am --abort".
>
>
> Please check this out.  If you feel there has been an error, please email
> aconole@redhat.com
>
> Thanks,
> 0-day Robot
> _______________________________________________
> dev mailing list
> dev@openvswitch.org
> https://mail.openvswitch.org/mailman/listinfo/ovs-dev
>
Ben Pfaff Feb. 28, 2020, 7:09 p.m. UTC | #3
Applied, thanks for the reminder.

On Wed, Feb 26, 2020 at 05:11:07PM +0100, Maciej Jozefczyk wrote:
> Hello,
> 
> Can I ask you to verify this patch and apply it on branch-2.12, please?
> We recently are having issues with Openstack gates because this patch is
> missing in branch-2.12
> 
> Thanks in advance!
> Maciej
> 
> On Mon, Oct 28, 2019 at 11:10 PM 0-day Robot <robot@bytheb.org> wrote:
> 
> > Bleep bloop.  Greetings Mark Michelson, I am a robot and I have tried out
> > your patch.
> > Thanks for your contribution.
> >
> > I encountered some error that I wasn't expecting.  See the details below.
> >
> >
> > git-am:
> > Failed to merge in the changes.
> > Patch failed at 0001 OVN: Combine conjunctions with identical matches into
> > one flow.
> > The copy of the patch that failed is found in:
> >
> >  /var/lib/jenkins/jobs/upstream_build_from_pw/workspace/.git/rebase-apply/patch
> > When you have resolved this problem, run "git am --resolved".
> > If you prefer to skip this patch, run "git am --skip" instead.
> > To restore the original branch and stop patching, run "git am --abort".
> >
> >
> > Please check this out.  If you feel there has been an error, please email
> > aconole@redhat.com
> >
> > Thanks,
> > 0-day Robot
> > _______________________________________________
> > dev mailing list
> > dev@openvswitch.org
> > https://mail.openvswitch.org/mailman/listinfo/ovs-dev
> >
> 
> 
> -- 
> Best regards,
> Maciej Józefczyk
> _______________________________________________
> dev mailing list
> dev@openvswitch.org
> https://mail.openvswitch.org/mailman/listinfo/ovs-dev
diff mbox series

Patch

diff --git a/ovn/controller/lflow.c b/ovn/controller/lflow.c
index 1aafafb33..09c2c78f1 100644
--- a/ovn/controller/lflow.c
+++ b/ovn/controller/lflow.c
@@ -735,8 +735,9 @@  consider_logical_flow(
                 dst->clause = src->clause;
                 dst->n_clauses = src->n_clauses;
             }
-            ofctrl_add_flow(flow_table, ptable, lflow->priority, 0, &m->match,
-                            &conj, &lflow->header_.uuid);
+
+            ofctrl_add_or_append_flow(flow_table, ptable, lflow->priority, 0,
+                                      &m->match, &conj, &lflow->header_.uuid);
             ofpbuf_uninit(&conj);
         }
     }
diff --git a/ovn/controller/ofctrl.c b/ovn/controller/ofctrl.c
index 0fcaa72c3..f7211c5e0 100644
--- a/ovn/controller/ofctrl.c
+++ b/ovn/controller/ofctrl.c
@@ -69,6 +69,11 @@  struct ovn_flow {
     uint64_t cookie;
 };
 
+static struct ovn_flow *ovn_flow_alloc(uint8_t table_id, uint16_t priority,
+                                       uint64_t cookie,
+                                       const struct match *match,
+                                       const struct ofpbuf *actions,
+                                       const struct uuid *sb_uuid);
 static uint32_t ovn_flow_match_hash(const struct ovn_flow *);
 static struct ovn_flow *ovn_flow_lookup(struct hmap *flow_table,
                                         const struct ovn_flow *target,
@@ -657,16 +662,8 @@  ofctrl_check_and_add_flow(struct ovn_desired_flow_table *flow_table,
                           const struct uuid *sb_uuid,
                           bool log_duplicate_flow)
 {
-    struct ovn_flow *f = xmalloc(sizeof *f);
-    f->table_id = table_id;
-    f->priority = priority;
-    minimatch_init(&f->match, match);
-    f->ofpacts = xmemdup(actions->data, actions->size);
-    f->ofpacts_len = actions->size;
-    f->sb_uuid = *sb_uuid;
-    f->match_hmap_node.hash = ovn_flow_match_hash(f);
-    f->uuid_hindex_node.hash = uuid_hash(&f->sb_uuid);
-    f->cookie = cookie;
+    struct ovn_flow *f = ovn_flow_alloc(table_id, priority, cookie, match,
+                                        actions, sb_uuid);
 
     ovn_flow_log(f, "ofctrl_add_flow");
 
@@ -721,9 +718,66 @@  ofctrl_add_flow(struct ovn_desired_flow_table *desired_flows,
     ofctrl_check_and_add_flow(desired_flows, table_id, priority, cookie,
                               match, actions, sb_uuid, true);
 }
+
+void
+ofctrl_add_or_append_flow(struct ovn_desired_flow_table *desired_flows,
+                          uint8_t table_id, uint16_t priority, uint64_t cookie,
+                          const struct match *match,
+                          const struct ofpbuf *actions,
+                          const struct uuid *sb_uuid)
+{
+    struct ovn_flow *f = ovn_flow_alloc(table_id, priority, cookie, match,
+                                        actions, sb_uuid);
+
+    ovn_flow_log(f, "ofctrl_add_or_append_flow");
+
+    struct ovn_flow *existing;
+    existing = ovn_flow_lookup(&desired_flows->match_flow_table, f, false);
+    if (existing) {
+        /* There's already a flow with this particular match. Append the
+         * action to that flow rather than adding a new flow
+         */
+        uint64_t compound_stub[64 / 8];
+        struct ofpbuf compound;
+        ofpbuf_use_stub(&compound, compound_stub, sizeof(compound_stub));
+        ofpbuf_put(&compound, existing->ofpacts, existing->ofpacts_len);
+        ofpbuf_put(&compound, f->ofpacts, f->ofpacts_len);
+
+        free(existing->ofpacts);
+        existing->ofpacts = xmemdup(compound.data, compound.size);
+        existing->ofpacts_len = compound.size;
+
+        ofpbuf_uninit(&compound);
+        ovn_flow_destroy(f);
+    } else {
+        hmap_insert(&desired_flows->match_flow_table, &f->match_hmap_node,
+                    f->match_hmap_node.hash);
+        hindex_insert(&desired_flows->uuid_flow_table, &f->uuid_hindex_node,
+                      f->uuid_hindex_node.hash);
+    }
+}
 
 /* ovn_flow. */
 
+static struct ovn_flow *
+ovn_flow_alloc(uint8_t table_id, uint16_t priority, uint64_t cookie,
+               const struct match *match, const struct ofpbuf *actions,
+               const struct uuid *sb_uuid)
+{
+    struct ovn_flow *f = xmalloc(sizeof *f);
+    f->table_id = table_id;
+    f->priority = priority;
+    minimatch_init(&f->match, match);
+    f->ofpacts = xmemdup(actions->data, actions->size);
+    f->ofpacts_len = actions->size;
+    f->sb_uuid = *sb_uuid;
+    f->match_hmap_node.hash = ovn_flow_match_hash(f);
+    f->uuid_hindex_node.hash = uuid_hash(&f->sb_uuid);
+    f->cookie = cookie;
+
+    return f;
+}
+
 /* Returns a hash of the match key in 'f'. */
 static uint32_t
 ovn_flow_match_hash(const struct ovn_flow *f)
diff --git a/ovn/controller/ofctrl.h b/ovn/controller/ofctrl.h
index 2b21c1133..54b80d48f 100644
--- a/ovn/controller/ofctrl.h
+++ b/ovn/controller/ofctrl.h
@@ -70,6 +70,12 @@  void ofctrl_add_flow(struct ovn_desired_flow_table *, uint8_t table_id,
                      const struct match *, const struct ofpbuf *ofpacts,
                      const struct uuid *);
 
+void ofctrl_add_or_append_flow(struct ovn_desired_flow_table *desired_flows,
+                               uint8_t table_id, uint16_t priority,
+                               uint64_t cookie, const struct match *match,
+                               const struct ofpbuf *actions,
+                               const struct uuid *sb_uuid);
+
 void ofctrl_remove_flows(struct ovn_desired_flow_table *, const struct uuid *);
 
 void ovn_desired_flow_table_init(struct ovn_desired_flow_table *);
diff --git a/tests/ovn.at b/tests/ovn.at
index 54aa19bb2..e339b8158 100644
--- a/tests/ovn.at
+++ b/tests/ovn.at
@@ -12197,7 +12197,7 @@  ovn-nbctl create Address_Set name=set1 \
 addresses=\"10.0.0.4\",\"10.0.0.5\",\"10.0.0.6\"
 ovn-nbctl create Address_Set name=set2 \
 addresses=\"10.0.0.7\",\"10.0.0.8\",\"10.0.0.9\"
-ovn-nbctl acl-add ls1 to-lport 1002 \
+ovn-nbctl acl-add ls1 to-lport 1001 \
 'ip4 && ip4.src == $set1 && ip4.dst == $set1' allow
 ovn-nbctl acl-add ls1 to-lport 1001 \
 'ip4 && ip4.src == $set1 && ip4.dst == $set2' drop
@@ -12246,7 +12246,7 @@  cat 2.expected > expout
 $PYTHON "$top_srcdir/utilities/ovs-pcap.in" hv1/vif2-tx.pcap > 2.packets
 AT_CHECK([cat 2.packets], [0], [expout])
 
-# There should be total of 12 flows present with conjunction action and 2 flows
+# There should be total of 9 flows present with conjunction action and 2 flows
 # with conj match. Eg.
 # table=44, priority=2002,conj_id=2,metadata=0x1 actions=resubmit(,45)
 # table=44, priority=2001,conj_id=3,metadata=0x1 actions=drop
@@ -12256,14 +12256,11 @@  AT_CHECK([cat 2.packets], [0], [expout])
 # priority=2001,ip,metadata=0x1,nw_dst=10.0.0.7 actions=conjunction(3,2/2)
 # priority=2001,ip,metadata=0x1,nw_dst=10.0.0.9 actions=conjunction(3,2/2)
 # priority=2001,ip,metadata=0x1,nw_dst=10.0.0.8 actions=conjunction(3,2/2)
-# priority=2002,ip,metadata=0x1,nw_src=10.0.0.6 actions=conjunction(2,1/2)
-# priority=2002,ip,metadata=0x1,nw_src=10.0.0.4 actions=conjunction(2,1/2)
-# priority=2002,ip,metadata=0x1,nw_src=10.0.0.5 actions=conjunction(2,1/2)
-# priority=2001,ip,metadata=0x1,nw_src=10.0.0.6 actions=conjunction(3,1/2)
-# priority=2001,ip,metadata=0x1,nw_src=10.0.0.4 actions=conjunction(3,1/2)
-# priority=2001,ip,metadata=0x1,nw_src=10.0.0.5 actions=conjunction(3,1/2)
-
-OVS_WAIT_UNTIL([test 12 = `as hv1 ovs-ofctl dump-flows br-int | \
+# priority=2002,ip,metadata=0x1,nw_src=10.0.0.6 actions=conjunction(2,1/2),conjunction(3,1/2)
+# priority=2002,ip,metadata=0x1,nw_src=10.0.0.4 actions=conjunction(2,1/2),conjunction(3,1/2)
+# priority=2002,ip,metadata=0x1,nw_src=10.0.0.5 actions=conjunction(2,1/2),conjunction(3,1/2)
+
+OVS_WAIT_UNTIL([test 9 = `as hv1 ovs-ofctl dump-flows br-int | \
 grep conjunction | wc -l`])
 OVS_WAIT_UNTIL([test 2 = `as hv1 ovs-ofctl dump-flows br-int | \
 grep conj_id | wc -l`])