netdev - [RFC net-next 1/6] tools: ynl: fix render-max for flags definition

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Date:   Thu, 23 Feb 2023 13:11:33 +0100
From:   Lorenzo Bianconi <lorenzo@...nel.org>
To:     netdev@...r.kernel.org
Cc:     bpf@...r.kernel.org, davem@...emloft.net, edumazet@...gle.com,
        kuba@...nel.org, pabeni@...hat.com, ast@...nel.org,
        daniel@...earbox.net, hawk@...nel.org, john.fastabend@...il.com,
        saeedm@...dia.com, tariqt@...dia.com, leon@...nel.org,
        shayagr@...zon.com, akiyano@...zon.com, darinzon@...zon.com,
        sgoutham@...vell.com, lorenzo.bianconi@...hat.com, toke@...hat.com
Subject: [RFC net-next 1/6] tools: ynl: fix render-max for flags definition

Properly manage render-max property for flags definition type
introducing mask value and setting it to (last_element << 1) - 1
instead of adding max value set to last_element + 1

Fixes: be5bea1cc0bf ("net: add basic C code generators for Netlink")
Signed-off-by: Lorenzo Bianconi <lorenzo@...nel.org>
---
 tools/net/ynl/ynl-gen-c.py | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/tools/net/ynl/ynl-gen-c.py b/tools/net/ynl/ynl-gen-c.py
index 3942f24b9163..161ae02bee54 100755
--- a/tools/net/ynl/ynl-gen-c.py
+++ b/tools/net/ynl/ynl-gen-c.py
@@ -1995,9 +1995,14 @@ def render_uapi(family, cw):
 
             if const.get('render-max', False):
                 cw.nl()
-                max_name = c_upper(name_pfx + 'max')
-                cw.p('__' + max_name + ',')
-                cw.p(max_name + ' = (__' + max_name + ' - 1)')
+                if const['type'] == 'flags':
+                    max_name = c_upper(name_pfx + 'mask')
+                    max_val = f' = {(entry.user_value() << 1) - 1},'
+                    cw.p(max_name + max_val)
+                else:
+                    max_name = c_upper(name_pfx + 'max')
+                    cw.p('__' + max_name + ',')
+                    cw.p(max_name + ' = (__' + max_name + ' - 1)')
             cw.block_end(line=';')
             cw.nl()
         elif const['type'] == 'const':
-- 
2.39.2