net: shaper: add a note that we expect cap dumps to be tiny

Various AI scan tools may complain that we don't support resuming
the cap dump. This is true, but the cap dumps are tiny.
net_shaper_nl_cap_pre_dumpit() sets up the dump for just
one device, so the size of the dump scales with NET_SHAPER_SCOPE_MAX (3).

We don't expect them to ever need more than a 4kB page.
Document this.

Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Link: https://patch.msgid.link/20260609183224.1108521-5-kuba@kernel.org
Signed-off-by: Paolo Abeni <pabeni@redhat.com>

diff --git a/net/shaper/shaper.c b/net/shaper/shaper.c
index 5a3b44c5d10f6375d1ab9e8f26124dc269d41f00..b65b356da16b359f8a31c6661cbd73a2589eabb5 100644 (file)
--- a/net/shaper/shaper.c
+++ b/net/shaper/shaper.c
@@ -1452,6 +1452,8 @@ int net_shaper_nl_cap_get_dumpit(struct sk_buff *skb,
 
                ret = net_shaper_cap_fill_one(skb, binding, scope, flags,
                                              info);
+               /* cap dumps are tiny, we expect them to fit in a single skb */
+               WARN_ON_ONCE(ret == -EMSGSIZE);
                if (ret)
                        return ret;
        }