[ovs-dev] [PATCH v2 ovn] northd: fix lb_action when there are no active backends for lb health_check
Numan Siddique
numans at ovn.org
Thu Nov 12 09:33:34 UTC 2020
On Wed, Nov 11, 2020 at 6:09 PM Lorenzo Bianconi
<lorenzo.bianconi at redhat.com> wrote:
>
> Fix the follwoing warning reported by ovn-controller when there are no
> active backends for lb health_check and selection_fields has been
> configured for hash computation
>
> flow|WARN|error parsing actions "drop; hash_fields="ip_dst,ip_src,tcp_dst,tcp_src");":
> Syntax error at `hash_fields' expecting end of input.
>
> Tested-by: Flavio Fernandes <flavio at flaviof.com>
> Fixes: 5af304e747 ("Support selection fields in load balancer.")
> Signed-off-by: Lorenzo Bianconi <lorenzo.bianconi at redhat.com>
Thanks Lorenzo. I applied this patch to master. This doesn't apply
cleanly to branch-20.09.
Can you please resubmit a backport patch for 20.09 ?
Thanks
Numan
> ---
> Changes since v1:
> - introduce unit-test
> ---
> northd/ovn-northd.c | 5 ++++-
> tests/ovn.at | 6 ++++--
> 2 files changed, 8 insertions(+), 3 deletions(-)
>
> diff --git a/northd/ovn-northd.c b/northd/ovn-northd.c
> index 996aebeb6..b039d1851 100644
> --- a/northd/ovn-northd.c
> +++ b/northd/ovn-northd.c
> @@ -3600,6 +3600,8 @@ static void build_lb_vip_ct_lb_actions(struct lb_vip *lb_vip,
> struct ds *action,
> char *selection_fields)
> {
> + bool skip_hash_fields = false;
> +
> if (lb_vip->health_check) {
> ds_put_cstr(action, "ct_lb(backends=");
>
> @@ -3618,6 +3620,7 @@ static void build_lb_vip_ct_lb_actions(struct lb_vip *lb_vip,
> }
>
> if (!n_active_backends) {
> + skip_hash_fields = true;
> ds_clear(action);
> ds_put_cstr(action, "drop;");
> } else {
> @@ -3628,7 +3631,7 @@ static void build_lb_vip_ct_lb_actions(struct lb_vip *lb_vip,
> ds_put_format(action, "ct_lb(backends=%s);", lb_vip->backend_ips);
> }
>
> - if (selection_fields && selection_fields[0]) {
> + if (!skip_hash_fields && selection_fields && selection_fields[0]) {
> ds_chomp(action, ';');
> ds_chomp(action, ')');
> ds_put_format(action, "; hash_fields=\"%s\");", selection_fields);
> diff --git a/tests/ovn.at b/tests/ovn.at
> index 94bd379b4..4c770ce79 100644
> --- a/tests/ovn.at
> +++ b/tests/ovn.at
> @@ -19326,6 +19326,8 @@ check ovn-nbctl lsp-set-addresses sw1-lr0 router
> check ovn-nbctl lsp-set-options sw1-lr0 router-port=lr0-sw1
>
> check ovn-nbctl lb-add lb1 10.0.0.10:80 10.0.0.3:80,20.0.0.3:80
> +OVN_LB_ID=$(ovn-nbctl --bare --column _uuid find load_balancer name=lb1)
> +check ovn-nbctl set load_balancer ${OVN_LB_ID} selection_fields="ip_dst,ip_src,tp_dst,tp_src"
>
> check ovn-nbctl --wait=sb set load_balancer . ip_port_mappings:10.0.0.3=sw0-p1:10.0.0.2
> check ovn-nbctl --wait=sb set load_balancer . ip_port_mappings:20.0.0.3=sw1-p1:20.0.0.2
> @@ -19365,14 +19367,14 @@ AT_CAPTURE_FILE([sbflows])
> OVS_WAIT_FOR_OUTPUT(
> [ovn-sbctl dump-flows > sbflows
> ovn-sbctl dump-flows sw0 | grep ct_lb | grep priority=120 | sed 's/table=..//'], 0,
> - [ (ls_in_stateful ), priority=120 , match=(ct.new && ip4.dst == 10.0.0.10 && tcp.dst == 80), action=(ct_lb(backends=10.0.0.3:80,20.0.0.3:80);)
> + [ (ls_in_stateful ), priority=120 , match=(ct.new && ip4.dst == 10.0.0.10 && tcp.dst == 80), action=(ct_lb(backends=10.0.0.3:80,20.0.0.3:80; hash_fields="ip_dst,ip_src,tcp_dst,tcp_src");)
> ])
>
> AT_CAPTURE_FILE([sbflows2])
> OVS_WAIT_FOR_OUTPUT(
> [ovn-sbctl dump-flows > sbflows2
> ovn-sbctl dump-flows lr0 | grep ct_lb | grep priority=120 | sed 's/table=..//'], 0,
> - [ (lr_in_dnat ), priority=120 , match=(ct.new && ip && ip4.dst == 10.0.0.10 && tcp && tcp.dst == 80 && is_chassis_resident("cr-lr0-public")), action=(ct_lb(backends=10.0.0.3:80,20.0.0.3:80);)
> + [ (lr_in_dnat ), priority=120 , match=(ct.new && ip && ip4.dst == 10.0.0.10 && tcp && tcp.dst == 80 && is_chassis_resident("cr-lr0-public")), action=(ct_lb(backends=10.0.0.3:80,20.0.0.3:80; hash_fields="ip_dst,ip_src,tcp_dst,tcp_src");)
> ])
>
> # get the svc monitor mac.
> --
> 2.26.2
>
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