Reload BCM SDK kmods on syncd start to handle syncd restart issues (#…

…12804)

Why I did it
There is an issue on the Arista PikeZ platform (using T3.X2: BCM56274) while running SONiC. If the 'syncd' container in SONiC is restarted, the expected behaviour is that syncd will automatically restart/recover; however it does not and always fails at create_switch due to BCM SDK kmod DMA operation cancellation getting stuck.

Sep 16 22:19:44.855125 pkz208 ERR syncd#syncd: [none] SAI_API_SWITCH:platform_process_command:428 Platform command "init soc" failed, rc = -1. Sep 16 22:19:44.855206 pkz208 INFO syncd#supervisord: syncd CMIC_CMC0_PKTDMA_CH4_DESC_COUNT_REQ:0x33#015 Sep 16 22:19:44.855264 pkz208 CRIT syncd#syncd: [none] SAI_API_SWITCH:platformInit:1909 initialization command "init soc" failed, rc = -1 (Internal error). Sep 16 22:19:44.855403 pkz208 CRIT syncd#syncd: [none] SAI_API_SWITCH:sai_driver_init:642 Error initializing driver, rc = -1. ... Sep 16 22:19:44.855891 pkz208 CRIT syncd#syncd: [none] SAI_API_SWITCH:brcm_sai_create_switch:1173 initializing SDK failed with error Operation failed (0xfffffff5).

Reloading the BCM SDK kmods allows the switch init to continue properly.

How I did it
If BCM SDK kmods are loaded, unload and load them again on syncd docker start script.

How to verify it
Steps to reproduce:

In SONiC, run 'docker ps' to see current running containers; 'syncd' should be present.
Run 'docker stop syncd'
Wait ~1 minute.
Run 'docker ps' to see that syncd is missing.
Check logs to see messages similar to the above.

Signed-off-by: Michael Li <michael.li@broadcom.com>

files/scripts/syncd.sh

@@ -28,6 +28,19 @@ function startplatform() {
         debug "Firmware update procedure ended"
     fi
 
+    if [[ x"$sonic_asic_platform" == x"broadcom" ]]; then
+        if [[ x"$WARM_BOOT" != x"true" ]]; then
+            is_bcm0=$(ls /sys/class/net | grep bcm0)
+            if [[ "$is_bcm0" == "bcm0" ]]; then
+                debug "stop SDK opennsl-modules ..."
+                /etc/init.d/opennsl-modules stop
+                debug "start SDK opennsl-modules ..."
+                /etc/init.d/opennsl-modules start
+                debug "started SDK opennsl-modules"
+            fi
+        fi
+    fi
+
     if [[ x"$sonic_asic_platform" == x"barefoot" ]]; then
         is_usb0=$(ls /sys/class/net | grep usb0)
         if [[ "$is_usb0" == "usb0" ]]; then