build: move protobuf files to a top-level directory

Up until now, the protobuf files were all located under
`python/spdk/sma/proto`.  This was fine, as they were only used in SMA
and we only generated python code.  However, now, we would also like to
to output code for other (e.g. go) languages too, so it no longer make
sense to keep them under `python`.

Only the protobuf files will be stored under `proto`.  The autogenerated
python code will remain under `python`, while the go code will be put in
the `go` directory.

While here, simplified the Makefile by removing a function generating
rules based on a directory, because we keep all protobuf files in the
same location.

Signed-off-by: Konrad Sztyber <konrad.sztyber@intel.com>
Change-Id: I4dcb7b33cd6f2930732f04dee62e35571b09315b
Reviewed-on: https://review.spdk.io/gerrit/c/spdk/spdk/+/15016
Tested-by: SPDK CI Jenkins <sys_sgci@intel.com>
Reviewed-by: Tomasz Zawadzki <tomasz.zawadzki@intel.com>
Reviewed-by: Jim Harris <james.r.harris@intel.com>
Community-CI: Mellanox Build Bot

Makefile

@@ -19,7 +19,7 @@ DIRS-y += test
 DIRS-$(CONFIG_IPSEC_MB) += ipsecbuild
 DIRS-$(CONFIG_ISAL) += isalbuild
 DIRS-$(CONFIG_VFIO_USER) += vfiouserbuild
-DIRS-y += python
+DIRS-$(CONFIG_SMA) += proto
 DIRS-$(CONFIG_XNVME) += xnvmebuild
 
 .PHONY: all clean $(DIRS-y) include/spdk/config.h mk/config.mk \

proto/Makefile

@@ -6,17 +6,10 @@
 SPDK_ROOT_DIR := $(abspath $(CURDIR)/..)
 include $(SPDK_ROOT_DIR)/mk/spdk.common.mk
 
-define generate_protobuf
-$(1)/%_pb2.py $(1)/%_pb2_grpc.py: $(1)/%.proto
-	$(Q)python3 -m grpc_tools.protoc -I $(1) --python_out=$(1) \
-		--grpc_python_out=$(1) --proto_path=$(1) $$^
-endef
-
-ifeq ($(CONFIG_SMA),y)
-protodirs = spdk/sma/proto
-protodefs = $(foreach protodir,$(protodirs),$(wildcard $(protodir)/*.proto))
-protopy = $(foreach proto,$(basename $(protodefs)),$(addprefix $(proto),_pb2.py _pb2_grpc.py))
-endif
+# Location where the python generated code is placed
+pydir=$(SPDK_ROOT_DIR)/python/spdk/sma/proto
+protodefs = $(wildcard *.proto)
+protopy = $(foreach proto,$(basename $(protodefs)),$(addprefix $(pydir)/$(proto),_pb2.py _pb2_grpc.py))
 
 all: $(protopy)
 
@@ -28,6 +21,8 @@ clean:
 install:
 uninstall:
 
-$(foreach protodir,$(protodirs),$(eval $(call generate_protobuf,$(protodir))))
+$(pydir)/%_pb2.py $(pydir)/%_pb2_grpc.py: %.proto
+	$(Q)python3 -m grpc_tools.protoc --proto_path=. --python_out=$(pydir) \
+		--grpc_python_out=$(pydir)  $^
 
 .PHONY: all clean install uninstall