tools: ynl-gen: record extra args for regen

ynl-regen needs to know the arguments used to generate a file.
Record excluded ops and, while at it, user headers.
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

tools/net/ynl/ynl-gen-c.py

@@ -2281,6 +2281,11 @@ def main():
     cw.p("/* Do not edit directly, auto-generated from: */")
     cw.p(f"/*\t{spec_kernel} */")
     cw.p(f"/* YNL-GEN {args.mode} {'header' if args.header else 'source'} */")
+    if args.exclude_op or args.user_header:
+        line = ''
+        line += ' --user-header '.join([''] + args.user_header)
+        line += ' --exclude-op '.join([''] + args.exclude_op)
+        cw.p(f'/* YNL-ARG{line} */')
     cw.nl()
 
     if args.mode == 'uapi':

tools/net/ynl/ynl-regen.sh

@@ -19,6 +19,7 @@ for f in $files; do
     # params:     0       1      2     3
     #         $YAML YNL-GEN kernel $mode
     params=( $(git grep -B1 -h '/\* YNL-GEN' $f | sed 's@/\*\(.*\)\*/@\1@') )
+    args=$(sed -n 's@/\* YNL-ARG \(.*\) \*/@\1@p' $f)
 
     if [ $f -nt ${params[0]} -a -z "$force" ]; then
 	echo -e "\tSKIP $f"
@@ -26,5 +27,6 @@ for f in $files; do
     fi
 
     echo -e "\tGEN ${params[2]}\t$f"
-    $TOOL --mode ${params[2]} --${params[3]} --spec $KDIR/${params[0]} -o $f
+    $TOOL --mode ${params[2]} --${params[3]} --spec $KDIR/${params[0]} \
+	  $args -o $f
 done