allow uninitialized gpu count (#858)

* allow uninitialized gpu count

* update protoc-gen-go

Author: jordanstephens

src/pkg/quota/service.go

@@ -41,7 +41,13 @@ func (q ServiceQuotas) ValidateQuotas(service *types.ServiceConfig) error {
 				if device.Driver != "" && device.Driver != "nvidia" {
 					return errors.New("only nvidia GPU devices are supported") // CodeInvalidArgument
 				}
-				if q.Gpus == 0 || uint32(device.Count) > q.Gpus {
+				var deviceCount uint32
+				if device.Count == -1 {
+					deviceCount = 1
+				} else {
+					deviceCount = uint32(device.Count)
+				}
+				if q.Gpus == 0 || deviceCount > q.Gpus {
 					return fmt.Errorf("gpu count %v exceeds quota %d", device.Count, q.Gpus) // CodeInvalidArgument
 				}
 			}

src/protos/io/defang/v1/fabric.pb.go

@@ -0,0 +1,7 @@
+services:
+  mistral:
+    deploy:
+      resources:
+        reservations:
+          devices:
+            - capabilities: ["gpu"]

src/tests/gpu/compose.yaml

@@ -0,0 +1,25 @@
+[
+  {
+    "command": null,
+    "deploy": {
+      "replicas": 1,
+      "resources": {
+        "reservations": {
+          "devices": [
+            {
+              "capabilities": [
+                "gpu"
+              ],
+              "count": -1
+            }
+          ]
+        }
+      },
+      "placement": {}
+    },
+    "entrypoint": null,
+    "networks": {
+      "default": null
+    }
+  }
+]

src/tests/gpu/compose.yaml.fixup

@@ -0,0 +1,15 @@
+name: gpu
+services:
+  mistral:
+    deploy:
+      resources:
+        reservations:
+          devices:
+            - capabilities:
+                - gpu
+              count: -1
+    networks:
+      default: null
+networks:
+  default:
+    name: gpu_default

src/tests/gpu/compose.yaml.golden

@@ -0,0 +1 @@
+ ! service "mistral": missing memory reservation; using provider-specific defaults. Specify deploy.resources.reservations.memory to avoid out-of-memory errors