From bc30bb88ff3153fba7693557d15733179adf7492 Mon Sep 17 00:00:00 2001 From: Jakub Kicinski Date: Wed, 25 Oct 2023 09:22:53 -0700 Subject: [PATCH] netlink: specs: support conditional operations Page pool code is compiled conditionally, but the operations are part of the shared netlink family. We can handle this by reporting empty list of pools or -EOPNOTSUPP / -ENOSYS but the cleanest way seems to be removing the ops completely at compilation time. That way user can see that the page pool ops are not present using genetlink introspection. Same way they'd check if the kernel is "new enough" to support the ops. Extend the specs with the ability to specify the config condition under which op (and its policies, etc.) should be hidden. Reviewed-by: Jiri Pirko Link: https://lore.kernel.org/r/20231025162253.133159-1-kuba@kernel.org Signed-off-by: Jakub Kicinski --- Documentation/netlink/genetlink-c.yaml | 5 +++++ Documentation/netlink/genetlink-legacy.yaml | 5 +++++ Documentation/netlink/genetlink.yaml | 5 +++++ tools/net/ynl/ynl-gen-c.py | 22 +++++++++++++++++++++ 4 files changed, 37 insertions(+) diff --git a/Documentation/netlink/genetlink-c.yaml b/Documentation/netlink/genetlink-c.yaml index 7ef2496d57c88..9d13bbb7ae473 100644 --- a/Documentation/netlink/genetlink-c.yaml +++ b/Documentation/netlink/genetlink-c.yaml @@ -295,6 +295,11 @@ properties: type: array items: enum: [ strict, dump, dump-strict ] + config-cond: + description: | + Name of the kernel config option gating the presence of + the operation, without the 'CONFIG_' prefix. + type: string do: &subop-type description: Main command handler. type: object diff --git a/Documentation/netlink/genetlink-legacy.yaml b/Documentation/netlink/genetlink-legacy.yaml index cd5ebe39b52c8..0daf40402a29d 100644 --- a/Documentation/netlink/genetlink-legacy.yaml +++ b/Documentation/netlink/genetlink-legacy.yaml @@ -346,6 +346,11 @@ properties: type: array items: enum: [ strict, dump, dump-strict ] + config-cond: + description: | + Name of the kernel config option gating the presence of + the operation, without the 'CONFIG_' prefix. + type: string # Start genetlink-legacy fixed-header: *fixed-header # End genetlink-legacy diff --git a/Documentation/netlink/genetlink.yaml b/Documentation/netlink/genetlink.yaml index 501ed2e6c8ef8..3283bf458ff13 100644 --- a/Documentation/netlink/genetlink.yaml +++ b/Documentation/netlink/genetlink.yaml @@ -264,6 +264,11 @@ properties: type: array items: enum: [ strict, dump, dump-strict ] + config-cond: + description: | + Name of the kernel config option gating the presence of + the operation, without the 'CONFIG_' prefix. + type: string do: &subop-type description: Main command handler. type: object diff --git a/tools/net/ynl/ynl-gen-c.py b/tools/net/ynl/ynl-gen-c.py index 31fd96f14fc0a..1c7474ad92dc8 100755 --- a/tools/net/ynl/ynl-gen-c.py +++ b/tools/net/ynl/ynl-gen-c.py @@ -1162,6 +1162,7 @@ def __init__(self, nlib, out_file=None): self._block_end = False self._silent_block = False self._ind = 0 + self._ifdef_block = None if out_file is None: self._out = os.sys.stdout else: @@ -1202,6 +1203,8 @@ def p(self, line, add_ind=0): if self._silent_block: ind += 1 self._silent_block = line.endswith(')') and CodeWriter._is_cond(line) + if line[0] == '#': + ind = 0 if add_ind: ind += add_ind self._out.write('\t' * ind + line + '\n') @@ -1328,6 +1331,19 @@ def write_struct_init(self, members): line += '= ' + str(one[1]) + ',' self.p(line) + def ifdef_block(self, config): + config_option = None + if config: + config_option = 'CONFIG_' + c_upper(config) + if self._ifdef_block == config_option: + return + + if self._ifdef_block: + self.p('#endif /* ' + self._ifdef_block + ' */') + if config_option: + self.p('#ifdef ' + config_option) + self._ifdef_block = config_option + scalars = {'u8', 'u16', 'u32', 'u64', 's32', 's64', 'uint', 'sint'} @@ -2006,10 +2022,13 @@ def print_req_policy_fwd(cw, struct, ri=None, terminate=True): def print_req_policy(cw, struct, ri=None): + if ri and ri.op: + cw.ifdef_block(ri.op.get('config-cond', None)) print_req_policy_fwd(cw, struct, ri=ri, terminate=False) for _, arg in struct.member_list(): arg.attr_policy(cw) cw.p("};") + cw.ifdef_block(None) cw.nl() @@ -2127,6 +2146,7 @@ def print_kernel_op_table(family, cw): if op.is_async: continue + cw.ifdef_block(op.get('config-cond', None)) cw.block_start() members = [('cmd', op.enum_name)] if 'dont-validate' in op: @@ -2157,6 +2177,7 @@ def print_kernel_op_table(family, cw): if op.is_async or op_mode not in op: continue + cw.ifdef_block(op.get('config-cond', None)) cw.block_start() members = [('cmd', op.enum_name)] if 'dont-validate' in op: @@ -2192,6 +2213,7 @@ def print_kernel_op_table(family, cw): members.append(('flags', ' | '.join([c_upper('genl-' + x) for x in flags]))) cw.write_struct_init(members) cw.block_end(line=',') + cw.ifdef_block(None) cw.block_end(line=';') cw.nl()