From f2ba1e5e22081e3279fd248677f53ce719fdc23d Mon Sep 17 00:00:00 2001
From: Jakub Kicinski <kuba@kernel.org>
Date: Thu, 8 Jun 2023 14:11:55 -0700
Subject: [PATCH] tools: ynl-gen: stop generating common notification handlers

Common notification handler was supposed to be a way for the user
to parse the notifications from a socket synchronously.
I don't think we'll end up using it, ynl_ntf_check() works for
all known use cases.

Signed-off-by: Jakub Kicinski <kuba@kernel.org>
---
 tools/net/ynl/ynl-gen-c.py | 73 --------------------------------------
 1 file changed, 73 deletions(-)

diff --git a/tools/net/ynl/ynl-gen-c.py b/tools/net/ynl/ynl-gen-c.py
index ecd8beba7e0d..f88417947e60 100755
--- a/tools/net/ynl/ynl-gen-c.py
+++ b/tools/net/ynl/ynl-gen-c.py
@@ -1810,70 +1810,6 @@ def print_ntf_type_free(ri):
     ri.cw.nl()
 
 
-def print_ntf_parse_prototype(family, cw, suffix=';'):
-    cw.write_func_prot('struct ynl_ntf_base_type *', f"{family['name']}_ntf_parse",
-                       ['struct ynl_sock *ys'], suffix=suffix)
-
-
-def print_ntf_type_parse(family, cw, ku_mode):
-    print_ntf_parse_prototype(family, cw, suffix='')
-    cw.block_start()
-    cw.write_func_lvar(['struct genlmsghdr *genlh;',
-                        'struct nlmsghdr *nlh;',
-                        'struct ynl_parse_arg yarg = { .ys = ys, };',
-                        'struct ynl_ntf_base_type *rsp;',
-                        'int len, err;',
-                        'mnl_cb_t parse;'])
-    cw.p('len = mnl_socket_recvfrom(ys->sock, ys->rx_buf, MNL_SOCKET_BUFFER_SIZE);')
-    cw.p('if (len < (ssize_t)(sizeof(*nlh) + sizeof(*genlh)))')
-    cw.p('return NULL;')
-    cw.nl()
-    cw.p('nlh = (struct nlmsghdr *)ys->rx_buf;')
-    cw.p('genlh = mnl_nlmsg_get_payload(nlh);')
-    cw.nl()
-    cw.block_start(line='switch (genlh->cmd)')
-    for ntf_op in sorted(family.all_notify.keys()):
-        op = family.ops[ntf_op]
-        ri = RenderInfo(cw, family, ku_mode, op, ntf_op, "notify")
-        for ntf in op['notify']['cmds']:
-            cw.p(f"case {ntf.enum_name}:")
-        cw.p(f"rsp = calloc(1, sizeof({type_name(ri, 'notify')}));")
-        cw.p(f"parse = {op_prefix(ri, 'reply', deref=True)}_parse;")
-        cw.p(f"yarg.rsp_policy = &{ri.struct['reply'].render_name}_nest;")
-        cw.p(f"rsp->free = (void *){op_prefix(ri, 'notify')}_free;")
-        cw.p('break;')
-    for op_name, op in family.ops.items():
-        if 'event' not in op:
-            continue
-        ri = RenderInfo(cw, family, ku_mode, op, op_name, "event")
-        cw.p(f"case {op.enum_name}:")
-        cw.p(f"rsp = calloc(1, sizeof({type_name(ri, 'event')}));")
-        cw.p(f"parse = {op_prefix(ri, 'reply', deref=True)}_parse;")
-        cw.p(f"yarg.rsp_policy = &{ri.struct['reply'].render_name}_nest;")
-        cw.p(f"rsp->free = (void *){op_prefix(ri, 'notify')}_free;")
-        cw.p('break;')
-    cw.p('default:')
-    cw.p('ynl_error_unknown_notification(ys, genlh->cmd);')
-    cw.p('return NULL;')
-    cw.block_end()
-    cw.nl()
-    cw.p('yarg.data = rsp->data;')
-    cw.nl()
-    cw.p(f"err = {cw.nlib.parse_cb_run('parse', '&yarg', True)};")
-    cw.p('if (err < 0)')
-    cw.p('goto err_free;')
-    cw.nl()
-    cw.p('rsp->family = nlh->nlmsg_type;')
-    cw.p('rsp->cmd = genlh->cmd;')
-    cw.p('return rsp;')
-    cw.nl()
-    cw.p('err_free:')
-    cw.p('free(rsp);')
-    cw.p('return NULL;')
-    cw.block_end()
-    cw.nl()
-
-
 def print_req_policy_fwd(cw, struct, ri=None, terminate=True):
     if terminate and ri and kernel_can_gen_family_struct(struct.family):
         return
@@ -2513,10 +2449,6 @@ def main():
                     print_rsp_type(ri)
                     cw.nl()
                     print_wrapped_type(ri)
-
-            if parsed.has_notifications():
-                cw.p('/* --------------- Common notification parsing --------------- */')
-                print_ntf_parse_prototype(parsed, cw)
             cw.nl()
         else:
             cw.p('/* Enums */')
@@ -2580,11 +2512,6 @@ def main():
 
                     ri = RenderInfo(cw, parsed, args.mode, op, op_name, "event")
                     print_ntf_type_free(ri)
-
-            if parsed.has_notifications():
-                cw.p('/* --------------- Common notification parsing --------------- */')
-                print_ntf_type_parse(parsed, cw, args.mode)
-
             cw.nl()
             render_user_family(parsed, cw, False)