Take management pool and headroom occupied by egress mirror into acco…

…unt when calculating buffer pool size for Mellanox

Signed-off-by: Stephen Sun <stephens@nvidia.com>

cfgmgr/buffer_pool_mellanox.lua

@@ -5,14 +5,17 @@ local appl_db = "0"
 local config_db = "4"
 local state_db = "6"
 
-local lossypg_reserved = 18 * 1024
+local lossypg_reserved = 19 * 1024
+local lossypg_reserved_400g = 37 * 1024
+local lossypg_400g = 0
 
 local result = {}
 local profiles = {}
 
 local count_up_port = 0
-local num_ports = 0
-local debug = tonumber(ARGV[1])
+
+local mgmt_pool_size = 256 * 1024
+local egress_mirror_headroom = 10 * 1024
 
 local function find_profile(ref)
     -- Remove the surrounding square bracket and the find in the list
@@ -57,6 +60,10 @@ local function iterate_all_items(all_items)
                     size = 1 + tonumber(string.sub(range, -1)) - tonumber(string.sub(range, 1, 1))
                 end
                 profiles[index][2] = profiles[index][2] + size
+                local speed = redis.call('HGET', 'PORT_TABLE:'..port, 'speed')
+                if speed == '400000' and profile == '[BUFFER_PROFILE:ingress_lossy_profile]' then
+                    lossypg_400g = lossypg_400g + size
+                end
             end
         end
     end
@@ -66,7 +73,6 @@ end
 redis.call('SELECT', config_db)
 
 local ports_table = redis.call('KEYS', 'PORT|*')
-local num_ports = #ports_table
 
 for i = 1, #ports_table do
     local status = redis.call('HGET', ports_table[i], 'admin_status')
@@ -115,6 +121,14 @@ for i = 1, #profiles, 1 do
     end
 end
 
+-- Extra lossy xon buffer for 400G port
+local lossypg_extra_for_400g = (lossypg_reserved_400g - lossypg_reserved) * lossypg_400g
+accumulative_occupied_buffer = accumulative_occupied_buffer + lossypg_extra_for_400g
+
+-- Accumulate sizes for egress mirror and management pool
+local accumulative_egress_mirror_overhead = count_up_port * egress_mirror_headroom
+accumulative_occupied_buffer = accumulative_occupied_buffer + accumulative_egress_mirror_overhead + mgmt_pool_size
+
 -- Fetch mmu_size
 redis.call('SELECT', state_db)
 local mmu_size = tonumber(redis.call('HGET', 'BUFFER_MAX_PARAM|global', 'mmu_size'))
@@ -131,9 +145,6 @@ local ceiling_mmu_size = number_of_cells * cell_size
 -- Switch to CONFIG_DB
 redis.call('SELECT', config_db)
 
-local ports_table = redis.call('KEYS', 'PORT|*')
-local num_ports = #ports_table
-
 -- Fetch all the pools that need update
 local pools_need_update = {}
 local ipools = redis.call('KEYS', 'BUFFER_POOL|ingress*')
@@ -175,5 +186,8 @@ table.insert(result, "debug:accumulative:" .. accumulative_occupied_buffer)
 for i = 1, #statistics do
     table.insert(result, "debug:" .. statistics[i][1] .. ":" .. statistics[i][2] .. ":" .. statistics[i][3])
 end
+table.insert(result, "debug:extra_400g:" .. (lossypg_reserved_400g - lossypg_reserved) .. ":" .. lossypg_400g)
+table.insert(result, "debug:mgmt_pool:" .. mgmt_pool_size)
+table.insert(result, "debug:egress_mirror:" .. accumulative_egress_mirror_overhead)
 
 return result