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net: Extend NAPI threaded polling to allow kthread based busy polling

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Add a new state NAPI_STATE_THREADED_BUSY_POLL to the NAPI state enum to
enable and disable threaded busy polling.

When threaded busy polling is enabled for a NAPI, enable
NAPI_STATE_THREADED also.

When the threaded NAPI is scheduled, set NAPI_STATE_IN_BUSY_POLL to
signal napi_complete_done not to rearm interrupts.

Whenever NAPI_STATE_THREADED_BUSY_POLL is unset, the
NAPI_STATE_IN_BUSY_POLL will be unset, napi_complete_done unsets the
NAPI_STATE_SCHED_THREADED bit also, which in turn will make the kthread
go to sleep.

Signed-off-by: Samiullah Khawaja <skhawaja@google.com>
Reviewed-by: Willem de Bruijn <willemb@google.com>
Acked-by: Martin Karsten <mkarsten@uwaterloo.ca>
Tested-by: Martin Karsten <mkarsten@uwaterloo.ca>
Link: https://patch.msgid.link/20251028203007.575686-2-skhawaja@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Samiullah Khawaja
2025-10-28 20:30:05 +00:00
committed by Andrii Nakryiko
parent 3fe0a72123
commit cd173d0ea3
1 changed files with 1 additions and 0 deletions
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1
include/uapi/linux/netdev.h
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@@ -80,6 +80,7 @@ enum netdev_qstats_scope {
enum netdev_napi_threaded {
NETDEV_NAPI_THREADED_DISABLED,
NETDEV_NAPI_THREADED_ENABLED,
NETDEV_NAPI_THREADED_BUSY_POLL,
};
enum {