[libteam][warm-reboot] fix issue in teamd warm-reboot that teamd star…

…ts (sonic-net#8227)

with state of tdport from previous warm-reboot.

In case LAG was down before reboot, lacp->wr is not cleared.
In lacp_event_watch_port_flush_data we incremented nr_of_tdports and add
tdport to lacp->wr.state. In case lacp->wr.state already had this tdport
we do not set new state for tdport but appened a new item in
lacp->wr.state. In case we preformed warm-reboot and PortChannel member
was down, after reboot PortChannel member became up next warm-reboot
will initialize teamd with PortChannel member in down state.

Fix this issue by calling stop_wr_mode() when LAG was down. This was probably intended but missed.

#### Why I did it

To fix an issue seen in warm-reboot-sad test cases.

#### How I did it

I fixed it in SONiC libteam patch that adds warm-reboot support. Details in commit description.

#### How to verify it

Run warm-reboot-sad test on t0-56 topology.

src/libteam/patch/0008-libteam-Add-warm_reboot-mode.patch

@@ -1,4 +1,4 @@
-From a4ab4de68134f6425f704a2ddcda33a4930645de Mon Sep 17 00:00:00 2001
+From cdc7eb674bb779b9e5181921e4c7c2b2f0a0db41 Mon Sep 17 00:00:00 2001
 From: Pavel Shirshov <[email protected]>
 Date: Tue, 3 Mar 2020 13:04:57 -0800
 Subject: [PATCH] [libteam]: Reimplement Warm-Reboot procedure'
@@ -9,8 +9,8 @@ Subject: [PATCH] [libteam]: Reimplement Warm-Reboot procedure'
  teamd/teamd.h             |   6 +
  teamd/teamd_events.c      |  13 ++
  teamd/teamd_per_port.c    |   6 +
- teamd/teamd_runner_lacp.c | 474 +++++++++++++++++++++++++++++++++++---
- 6 files changed, 512 insertions(+), 44 deletions(-)
+ teamd/teamd_runner_lacp.c | 475 +++++++++++++++++++++++++++++++++++---
+ 6 files changed, 513 insertions(+), 44 deletions(-)
 
 diff --git a/libteam/ifinfo.c b/libteam/ifinfo.c
 index 46d56a2..b86d34c 100644
@@ -35,7 +35,7 @@ index 46d56a2..b86d34c 100644
  	}
  }
 diff --git a/teamd/teamd.c b/teamd/teamd.c
-index bf42347..221d71d 100644
+index 421e34d..33512a6 100644
 --- a/teamd/teamd.c
 +++ b/teamd/teamd.c
 @@ -117,7 +117,9 @@ static void print_help(const struct teamd_context *ctx) {
@@ -203,7 +203,7 @@ index 221803e..bd4dcc1 100644
  			   struct teamd_port *tdport)
  {
 diff --git a/teamd/teamd_per_port.c b/teamd/teamd_per_port.c
-index 166da57..03f8d63 100644
+index 166da57..cefd6c2 100644
 --- a/teamd/teamd_per_port.c
 +++ b/teamd/teamd_per_port.c
 @@ -350,6 +350,12 @@ static int teamd_port_remove(struct teamd_context *ctx,
@@ -220,7 +220,7 @@ index 166da57..03f8d63 100644
  		      tdport->ifname, tdport->ifindex);
  	err = team_port_remove(ctx->th, tdport->ifindex);
 diff --git a/teamd/teamd_runner_lacp.c b/teamd/teamd_runner_lacp.c
-index 55abe88..f225fb2 100644
+index 955ef0c..782fc05 100644
 --- a/teamd/teamd_runner_lacp.c
 +++ b/teamd/teamd_runner_lacp.c
 @@ -31,6 +31,7 @@
@@ -523,7 +523,7 @@ index 55abe88..f225fb2 100644
 +						/* the port was up before the WR. Trying to restore it */
 +						struct lacpdu lacpdu;
 +						err = lacpdu_read(lacp_port, &lacpdu);
-+						if (err) /* Can't read, so the port will start from scratch */ 
++						if (err) /* Can't read, so the port will start from scratch */
 +							continue;
 +						teamd_log_info("WR-mode. State of the LAG member port '%s' was restored.",
 +							tdport->ifname);
@@ -810,7 +810,7 @@ index 55abe88..f225fb2 100644
  static const struct teamd_event_watch_ops lacp_event_watch_ops = {
  	.hwaddr_changed = lacp_event_watch_hwaddr_changed,
  	.port_hwaddr_changed = lacp_event_watch_port_hwaddr_changed,
-@@ -1469,21 +1848,35 @@ static const struct teamd_event_watch_ops lacp_event_watch_ops = {
+@@ -1469,21 +1848,36 @@ static const struct teamd_event_watch_ops lacp_event_watch_ops = {
  	.port_changed = lacp_event_watch_port_changed,
  	.admin_state_changed = lacp_event_watch_admin_state_changed,
  	.refresh = lacp_event_watch_refresh,
@@ -832,6 +832,7 @@ index 55abe88..f225fb2 100644
 +		if (lacp->wr.carrier_up) {
 +			teamd_log_info("WR-mode. Starting in WR mode");
 +		} else {
++			stop_wr_mode(lacp);
 +			teamd_log_info("WR-mode. Starting in normal mode. The LAG interface was down before restart");
 +		}
 +		ctx->warm_start_mode = lacp->wr.carrier_up;
@@ -851,7 +852,7 @@ index 55abe88..f225fb2 100644
  	return 0;
  }
 
-@@ -1951,6 +2344,12 @@ static int lacp_init(struct teamd_context *ctx, void *priv)
+@@ -1951,6 +2345,12 @@ static int lacp_init(struct teamd_context *ctx, void *priv)
  	}
 
  	lacp->ctx = ctx;
@@ -864,7 +865,7 @@ index 55abe88..f225fb2 100644
  	err = teamd_hash_func_set(ctx);
  	if (err)
  		return err;
-@@ -1992,10 +2391,13 @@ static void lacp_fini(struct teamd_context *ctx, void *priv)
+@@ -1992,10 +2392,13 @@ static void lacp_fini(struct teamd_context *ctx, void *priv)
  {
  	struct lacp *lacp = priv;
 
@@ -880,5 +881,5 @@ index 55abe88..f225fb2 100644
 
  const struct teamd_runner teamd_runner_lacp = {
 -- 
-2.17.1.windows.2
+2.17.1