Merge branch 'netconsole-fix-reported-problems'

Breno Leitao says:

====================
netconsole: Fix reported problems

These are some of the issues that LLM reported to netconsole, and they
are being addressed here before big refactors.

I was doing some big refactors, and got some "pre-existent-issues"
during LLM review of the refactor, that make them hard to guarantee that
refactor is not introducing any bug, so, let's clean these pre-existent
bugs first, and then submit the refactor.

The issues fixed in this patchset were reported during the review of
https://lore.kernel.org/all/20260524-netconsole_move_more-v1-0-909d1ab398b4@debian.org/

Not all of them got fixed, but, those that were easy to reason about.

Why net-next and not 'net' tree.

Most of the functions that are being fixed here moved from netpoll to
netconsole, thus, fixing this on net will cause merge conflicts from
'net' to 'net-next', thus I decided to fix it on 'net-next', given we
are on 7.1-rc6 already. Sorry if that is not the right approach.
====================

Link: https://patch.msgid.link/20260604-netcons_fix_before_move-v3-0-ab055b3a6aa5@debian.org
Signed-off-by: Paolo Abeni <pabeni@redhat.com>

1 files changed, 16 insertions, 0 deletions

diff --git a/include/linux/netpoll.h b/include/linux/netpoll.h
index e4b8f1f91e54..88f7daa8560e 100644
--- a/include/linux/netpoll.h
+++ b/include/linux/netpoll.h
@@ -13,12 +13,28 @@
 #include <linux/rcupdate.h>
 #include <linux/list.h>
 #include <linux/refcount.h>
+#include <linux/ip.h>
+#include <linux/udp.h>
 
 union inet_addr {
 	__be32		ip;
 	struct in6_addr	in6;
 };
 
+/*
+ * Maximum payload netpoll's preallocated skb pool can carry. Keep this in
+ * sync with the buffer size used by refill_skbs() in net/core/netpoll.c;
+ * callers (e.g. netconsole) use it to detect requests the pool can never
+ * satisfy and avoid dequeuing a pooled skb that would later trip
+ * skb_over_panic() in skb_put().
+ */
+#define MAX_UDP_CHUNK	1460
+#define MAX_SKB_SIZE						\
+	(sizeof(struct ethhdr) +				\
+	 sizeof(struct iphdr) +					\
+	 sizeof(struct udphdr) +				\
+	 MAX_UDP_CHUNK)
+
 struct netpoll {
 	struct net_device *dev;
 	netdevice_tracker dev_tracker;