[ovs-dev] [PATCH ovn v2] ovn-northd: Optionally skip the check of lsp_is_up.
Numan Siddique
numans at ovn.org
Wed Sep 9 11:15:40 UTC 2020
On Wed, Sep 9, 2020 at 2:52 AM Han Zhou <hzhou at ovn.org> wrote:
>
> The checking of lsp "up" status before adding ARP responder flows was
> added to avoid confusion in cases when a network admin sees ARP response
> for VM/containers that is not up on chassis yet. However, this check
> introduces an extra round of flow change in SB and triggers computes
> on hypervisors which is unnecessary cost in most cases, especially for
> large scale environment. To improve this, this patch provides an option
> ignore_lsp_down to disable the check for the use cases when ARP reponse for a
> port that is "down" isn't considered harmful.
>
> Acked-by: Numan Siddique <numans at ovn.org>
> Signed-off-by: Han Zhou <hzhou at ovn.org>
> ---
> v1 -> v2: change the option from "check_lsp_is_up" to "ignore_lsp_down" as
> suggested by Numan.
Hi Han,
The patch LGTM.
Thanks
Numan
>
> northd/ovn-northd.8.xml | 15 ++++++++++-----
> northd/ovn-northd.c | 7 ++++++-
> ovn-nb.xml | 13 +++++++++++++
> tests/ovn-northd.at | 14 ++++++++++++++
> 4 files changed, 43 insertions(+), 6 deletions(-)
>
> diff --git a/northd/ovn-northd.8.xml b/northd/ovn-northd.8.xml
> index d15245a..a275442 100644
> --- a/northd/ovn-northd.8.xml
> +++ b/northd/ovn-northd.8.xml
> @@ -763,9 +763,11 @@ output;
>
> <p>
> These flows are omitted for logical ports (other than router ports or
> - <code>localport</code> ports) that are down, for logical ports of
> - type <code>virtual</code> and for logical ports with 'unknown'
> - address set.
> + <code>localport</code> ports) that are down (unless <code>
> + ignore_lsp_down</code> is configured as true in <code>options</code>
> + column of <code>NB_Global</code> table of the <code>Northbound</code>
> + database), for logical ports of type <code>virtual</code> and for
> + logical ports with 'unknown' address set.
> </p>
> </li>
>
> @@ -812,8 +814,11 @@ nd_na_router {
>
> <p>
> These flows are omitted for logical ports (other than router ports or
> - <code>localport</code> ports) that are down and for logical ports of
> - type <code>virtual</code>.
> + <code>localport</code> ports) that are down (unless <code>
> + ignore_lsp_down</code> is configured as true in <code>options</code>
> + column of <code>NB_Global</code> table of the <code>Northbound</code>
> + database), for logical ports of type <code>virtual</code> and for
> + logical ports with 'unknown' address set.
> </p>
> </li>
>
> diff --git a/northd/ovn-northd.c b/northd/ovn-northd.c
> index bebb25a..100d9dc 100644
> --- a/northd/ovn-northd.c
> +++ b/northd/ovn-northd.c
> @@ -87,6 +87,8 @@ static struct eth_addr mac_prefix;
>
> static bool controller_event_en;
>
> +static bool check_lsp_is_up;
> +
> /* MAC allocated for service monitor usage. Just one mac is allocated
> * for this purpose and ovn-controller's on each chassis will make use
> * of this mac when sending out the packets to monitor the services
> @@ -6741,7 +6743,8 @@ build_lswitch_flows(struct hmap *datapaths, struct hmap *ports,
> * - port type is router or
> * - port type is localport
> */
> - if (!lsp_is_up(op->nbsp) && strcmp(op->nbsp->type, "router") &&
> + if (check_lsp_is_up &&
> + !lsp_is_up(op->nbsp) && strcmp(op->nbsp->type, "router") &&
> strcmp(op->nbsp->type, "localport")) {
> continue;
> }
> @@ -11831,6 +11834,8 @@ ovnnb_db_run(struct northd_context *ctx,
>
> controller_event_en = smap_get_bool(&nb->options,
> "controller_event", false);
> + check_lsp_is_up = !smap_get_bool(&nb->options,
> + "ignore_lsp_down", false);
>
> build_datapaths(ctx, datapaths, lr_list);
> build_ports(ctx, sbrec_chassis_by_name, datapaths, ports);
> diff --git a/ovn-nb.xml b/ovn-nb.xml
> index 109ffcf..0bfe626 100644
> --- a/ovn-nb.xml
> +++ b/ovn-nb.xml
> @@ -167,6 +167,19 @@
> </p>
> </column>
>
> + <column name="options" key="ignore_lsp_down">
> + <p>
> + If set to false, ARP/ND reply flows for logical switch ports will be
> + installed only if the port is up, i.e. claimed by a Chassis. If set
> + to true, these flows are installed regardless of the status of the
> + port, which can result in a situation that ARP request to an IP is
> + resolved even before the relevant VM/container is running. For
> + environments where this is not an issue, setting it to
> + <code>true</code> can reduce the load and latency of the control
> + plane. The default value is <code>false</code>.
> + </p>
> + </column>
> +
> <group title="Options for configuring interconnection route advertisement">
> <p>
> These options control how routes are advertised between OVN
> diff --git a/tests/ovn-northd.at b/tests/ovn-northd.at
> index c6d9ae11..b89c585 100644
> --- a/tests/ovn-northd.at
> +++ b/tests/ovn-northd.at
> @@ -1991,3 +1991,17 @@ AT_CHECK([ovn-sbctl lflow-list | grep "ls_out_pre_lb.*priority=100" | grep reg0
> ])
>
> AT_CLEANUP
> +
> +AT_SETUP([ovn -- ignore_lsp_down])
> +ovn_start
> +
> +ovn-nbctl ls-add sw0
> +ovn-nbctl lsp-add sw0 sw0-p1 -- lsp-set-addresses sw0-p1 "aa:aa:aa:aa:aa:aa 10.0.0.1"
> +
> +ovn-nbctl --wait=sb sync
> +AT_CHECK([ovn-sbctl lflow-list | grep arp | grep 10\.0\.0\.1], [1], [ignore])
> +
> +ovn-nbctl --wait=sb set NB_Global . options:ignore_lsp_down=true
> +AT_CHECK([ovn-sbctl lflow-list | grep arp | grep 10\.0\.0\.1], [0], [ignore])
> +
> +AT_CLEANUP
> --
> 2.1.0
>
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