Davide Caratti 6b1a3968fb act_mirred: use the backlog for nested calls to mirred ingress ... [ Upstream commit ca22da2fbd ] William reports kernel soft-lockups on some OVS topologies when TC mirred egress->ingress action is hit by local TCP traffic [1]. The same can also be reproduced with SCTP (thanks Xin for verifying), when client and server reach themselves through mirred egress to ingress, and one of the two peers sends a "heartbeat" packet (from within a timer). Enqueueing to backlog proved to fix this soft lockup; however, as Cong noticed [2], we should preserve - when possible - the current mirred behavior that counts as "overlimits" any eventual packet drop subsequent to the mirred forwarding action [3]. A compromise solution might use the backlog only when tcf_mirred_act() has a nest level greater than one: change tcf_mirred_forward() accordingly. Also, add a kselftest that can reproduce the lockup and verifies TC mirred ability to account for further packet drops after TC mirred egress->ingress (when the nest level is 1). [1] https://lore.kernel.org/netdev/33dc43f587ec1388ba456b4915c75f02a8aae226.1663945716.git.dcaratti@redhat.com/ [2] https://lore.kernel.org/netdev/Y0w%2FWWY60gqrtGLp@pop-os.localdomain/ [3] such behavior is not guaranteed: for example, if RPS or skb RX timestamping is enabled on the mirred target device, the kernel can defer receiving the skb and return NET_RX_SUCCESS inside tcf_mirred_forward(). Reported-by: William Zhao <wizhao@redhat.com> CC: Xin Long <lucien.xin@gmail.com> Signed-off-by: Davide Caratti <dcaratti@redhat.com> Reviewed-by: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com> Acked-by: Jamal Hadi Salim <jhs@mojatatu.com> Signed-off-by: Paolo Abeni <pabeni@redhat.com> [ skulkarni: Adjusted patch for file 'tc_actions.sh' wrt the mainline commit ] Signed-off-by: Shubham Kulkarni <skulkarni@mvista.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2025-08-28 16:21:36 +02:00
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accounting
arch	x86/insn: Fix PUSH instruction in x86 instruction decoder opcode map	2024-06-16 13:28:39 +02:00
bpf	bpftool: Fix memory leak in dump_xx_nlmsg on realloc failure	2025-08-28 16:21:19 +02:00
build	tools/build: Don't pass test log files to linker	2025-06-04 14:32:30 +02:00
cgroup
debugging
firewire
firmware
gpio
hv
iio	tools/iio: Add memory allocation failure check for trigger_name	2024-11-08 16:20:45 +01:00
include	tools: move alignment-related macros to new <linux/align.h>	2024-09-04 13:15:02 +02:00
io_uring
kvm/kvm_stat
laptop
leds
lib	libbpf: Add NULL checks to bpf_object__{prev_map,next_map}	2024-09-12 11:03:54 +02:00
memory-model	tools/memory-model: Fix bug in lock.cat	2024-08-19 05:33:37 +02:00
nfsd
objtool	objtool: Add support for intra-function calls	2024-04-13 12:51:29 +02:00
pci
pcmcia
perf	perf tests bp_account: Fix leaked file descriptor	2025-08-28 16:21:20 +02:00
power	pm: cpupower: Fix the snapshot-order of tsc,mperf, clock in mperf_stop()	2025-08-28 16:21:25 +02:00
scripts
spi
testing	act_mirred: use the backlog for nested calls to mirred ingress	2025-08-28 16:21:36 +02:00
thermal/tmon
time
usb	usbip: tools: Fix detach_port() invalid port error path	2024-11-08 16:20:53 +01:00
virtio
vm
wmi
Makefile