[broadcom]: Set default SYNCD_SHM_SIZE for Broadcom XGS devices (#13297)

After upgrade to brcmsai 8.1, the sdk running environment (container) recommended with mininum memory size as below

TH4/TD4(ltsw) uses 512MB
TH3 used 300MB
Helix4/TD2/TD3/TH/TH 256 MB
Base on this requirement, adjust the default syncd share memory size and set the memory size for special ACISs in platform_env.conf file for different types of Broadcom ASICs.

How I did it
Add the platform_env.conf file if none of it for broadcom platform (base on platform_asic file)
Add the 'SYNCD_SHM_SIZE' and set the value

for ltsw(TD4/TH4) devices set to 512M at least (update the platform_env.conf)
for Td2/TH2/TH devices set to 256M
for TH3 set to 300M

verify

How to verify it
verify the image with code fix
Check with UT
Check on lab devices

On a problematic device which cannot start successfully
Run with the command
$ cat /proc/linux-kernel-bde
Broadcom Device Enumerator (linux-kernel-bde)
Module parameters:
        maxpayload=128
        usemsi=0
        dmasize=32M
        himem=(null)
        himemaddr=(null)
DMA Memory (kernel): 33554432 bytes, 0 used, 33554432 free, local mmap
No devices found
$ docker rm -f syncd
syncd
$ sudo /usr/bin/syncd.sh start
Cannot get Broadcom Chip Id. Skip set SYNCD_SHM_SIZE.
Creating new syncd container with HWSKU Force10-S6000
a4862129a7fea04f00ed71a88715eac65a41cdae51c3158f9cdd7de3ccc3dd31
$ docker inspect syncd | grep -i shm
            "ShmSize": 67108864,
                "Tag": "fix_8.1_shm_issue.67873427-9f7ca60a0e",
On Normal device
$ docker inspect syncd | grep -i shm
            "ShmSize": 268435456,
                "Tag": "fix_8.1_shm_issue.67873427-9f7ca60a0e"
change the config syncd_shm.ini to b85=128m

$ docker rm -f syncd
syncd
$ sudo /usr/bin/syncd.sh start
Creating new syncd container with HWSKU Force10-S6000
3209ffc1e5a7224b99640eb9a286c4c7aa66a2e6a322be32fb7fe2113bb9524c
$  docker inspect syncd | grep -i shm
            "ShmSize": 134217728,
                "Tag": "fix_8.1_shm_issue.67873427-9f7ca60a0e",
change the config under
/usr/share/sonic/device/x86_64-dell_s6000_s1220-r0/Force10-S6000/platform_env.conf
and run command

$ cat /usr/share/sonic/device/x86_64-dell_s6000_s1220-r0/platform_env.conf
SYNCD_SHM_SIZE=300m

$ sudo /usr/bin/syncd.sh start
Creating new syncd container with HWSKU Force10-S6000
897f6fcde1f669ad2caab7da4326079abd7e811bf73f018c6dacc24cf24bfda5
$  docker inspect syncd | grep -i shm
            "ShmSize": 314572800,
                "Tag": "fix_8.1_shm_issue.67873427-9f7ca60a0e",

Signed-off-by: richardyu-ms <richard.yu@microsoft.com>

device/arista/x86_64-arista_7050dx4_32s/platform_env.conf

@@ -1,2 +1,2 @@
-SYNCD_SHM_SIZE=256m
+SYNCD_SHM_SIZE=512m
 is_ltsw_chip=1

device/arista/x86_64-arista_7050px4_32s/platform_env.conf

@@ -1,2 +1,2 @@
-SYNCD_SHM_SIZE=256m
+SYNCD_SHM_SIZE=512m
 is_ltsw_chip=1

device/arista/x86_64-arista_7060dx5_64s/platform_env.conf

@@ -1,2 +1,2 @@
-SYNCD_SHM_SIZE=128m
+SYNCD_SHM_SIZE=512m
 is_ltsw_chip=1

device/arista/x86_64-arista_7060px5_64s/platform_env.conf

@@ -1,2 +1,2 @@
-SYNCD_SHM_SIZE=128m
+SYNCD_SHM_SIZE=512m
 is_ltsw_chip=1

device/broadcom/x86_64-broadcom_common/syncd_shm.ini

@@ -0,0 +1,14 @@
+# This file contains the default memory size for each ASICs in broadcom platform
+# Format: ASIC_ID=Memory_size
+#b77->td3
+b77=256m
+#b85->td2
+b85=256m
+#b87->td3
+b87=512m
+#b96->th
+b96=256m
+#b97->th2
+b97=256m
+#b98->th3
+b98=300m

files/build_templates/docker_image_ctl.j2

@@ -315,6 +315,29 @@ start() {
         source $PLATFORM_ENV_CONF
     fi
 
+    {%- if sonic_asic_platform == "broadcom" %}
+    {%- if docker_container_name == "syncd" %}
+    # Set the SYNCD_SHM_SIZE if this variable not defined    
+    BRCM_PLATFORM_COMMON_DIR=/usr/share/sonic/device/x86_64-broadcom_common
+    SYNCD_SHM_INI=$BRCM_PLATFORM_COMMON_DIR/syncd_shm.ini
+
+    readline=$(grep '0x14e4' /proc/linux-kernel-bde)
+    bcm_chip_id=${readline#*0x14e4:0x}
+    bcm_chip_id=${bcm_chip_id::3}
+
+    if [ -z "$SYNCD_SHM_SIZE" ]; then
+        if [ -z "$bcm_chip_id" ]; then
+            echo "Cannot get Broadcom Chip Id. Skip set SYNCD_SHM_SIZE."
+        elif [ -f "$SYNCD_SHM_INI" ] && [ "$(grep -m1 "^${bcm_chip_id}=" $SYNCD_SHM_INI)" ]; then
+                SYNCD_SHM_SIZE=`grep -m1 "^${bcm_chip_id}=" $SYNCD_SHM_INI | awk -F= '{print $2}'`
+        else
+            echo "Cannot get SYNCD_SHM_SIZE for chip: [${bcm_chip_id}] in $SYNCD_SHM_INI. Skip set SYNCD_SHM_SIZE."
+        fi
+
+    fi
+    {%- endif %}
+    {%- endif %}
+
     {%- if docker_container_name == "gbsyncd" %}
     GBSYNCD_CONF=/usr/share/sonic/device/$PLATFORM/gbsyncd.ini
     GBSYNCD_PLATFORM=gbsyncd-vs