Preliminary mgmt-gateway task (#655)

Handles basic discovery messages and exposes a USART over UDP.

Author: jgallagher

Cargo.lock

@@ -109,7 +109,7 @@ task-slots = ["user_leds"]
 name = "task-uartecho"
 features = ["stm32h753", "usart2"]
 uses = ["usart2"]
-interrupts = {"usart2.irq" = 1}
+interrupts = {"usart2.irq" = 0b01}
 priority = 3
 max-sizes = {flash = 8192, ram = 4096}
 stacksize = 2048
@@ -138,7 +138,7 @@ task-slots = ["sys"]
 
 [tasks.net]
 name = "task-net"
-stacksize = 4320
+stacksize = 4800
 priority = 3
 features = ["h753", "h7-vlan", "gimletlet-nic"]
 max-sizes = {flash = 65536, ram = 16384, sram1 = 16384}
@@ -157,6 +157,20 @@ start = true
 task-slots = ["net"]
 features = ["vlan"]
 
+[tasks.mgmt_gateway]
+name = "task-mgmt-gateway"
+priority = 4
+max-sizes = {flash = 32768, ram = 8192}
+stacksize = 4096
+start = true
+uses = [
+    "usart1",
+    "system_flash", # TODO also used by `net`, both to read the stm32 uid
+]
+task-slots = ["net", "sys"]
+features = ["usart1", "vlan"]
+interrupts = {"usart1.irq" = 0b10}
+
 [tasks.validate]
 name = "task-validate"
 priority = 3
@@ -262,3 +276,10 @@ owner = {name = "udpecho", notification = 1}
 port = 7
 tx = { packets = 3, bytes = 1024 }
 rx = { packets = 3, bytes = 1024 }
+
+[config.net.sockets.mgmt_gateway]
+kind = "udp"
+owner = {name = "mgmt_gateway", notification = 0b01}
+port = 11111 # TODO do we have a documented port for MGS traffic?
+tx = { packets = 3, bytes = 1024 }
+rx = { packets = 3, bytes = 1024 }

app/gimletlet/app.toml

@@ -0,0 +1,24 @@
+[package]
+name = "task-mgmt-gateway"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
+cfg-if = "1"
+num-traits = {version = "0.2", default-features = false}
+serde = {version = "1", default-features = false, features = ["derive"]}
+ssmarshal = {version = "1", default-features = false}
+tinyvec = "1.6"
+
+drv-stm32h7-usart = {path = "../../drv/stm32h7-usart", features = ["h753"]}
+drv-stm32xx-uid = {path = "../../drv/stm32xx-uid", features = ["family-stm32h7"]}
+ringbuf = {path = "../../lib/ringbuf"}
+task-net-api = {path = "../net-api", features = ["use-smoltcp"]}
+userlib = {path = "../../sys/userlib", features = ["panic-messages"]}
+
+gateway-messages = {git = "https://github.com/oxidecomputer/omicron", rev = "5951498bbd60306bf8e73a382e6b5aaed67a7616"}
+
+[features]
+vlan = ["task-net-api/vlan"]
+usart1 = []
+usart2 = []