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Antoine Tenart
db4ce5d04b
JIRA: https://issues.redhat.com/browse/RHEL-139236 Upstream Status: linux.git Conflicts:\ - Context difference due to missing upstream commit b0e214d21203 ("netfilter: keep conntrack reference until IPsecv6 policy checks are done") in c9s. commit a6f190630d070173897a7e98a30188b7638ba0a1 Author: Jesper Dangaard Brouer <hawk@kernel.org> Date: Wed Jul 16 18:26:53 2025 +0200 net: track pfmemalloc drops via SKB_DROP_REASON_PFMEMALLOC Add a new SKB drop reason (SKB_DROP_REASON_PFMEMALLOC) to track packets dropped due to memory pressure. In production environments, we've observed memory exhaustion reported by memory layer stack traces, but these drops were not properly tracked in the SKB drop reason infrastructure. While most network code paths now properly report pfmemalloc drops, some protocol-specific socket implementations still use sk_filter() without drop reason tracking: - Bluetooth L2CAP sockets - CAIF sockets - IUCV sockets - Netlink sockets - SCTP sockets - Unix domain sockets These remaining cases represent less common paths and could be converted in a follow-up patch if needed. The current implementation provides significantly improved observability into memory pressure events in the network stack, especially for key protocols like TCP and UDP, helping to diagnose problems in production environments. Reported-by: Matt Fleming <mfleming@cloudflare.com> Signed-off-by: Jesper Dangaard Brouer <hawk@kernel.org> Link: https://patch.msgid.link/175268316579.2407873.11634752355644843509.stgit@firesoul Signed-off-by: Jakub Kicinski <kuba@kernel.org> Signed-off-by: Antoine Tenart <atenart@redhat.com>