net: update NAPI threaded config even for disabled NAPIs

We have to make sure that all future NAPIs will have the right threaded
state when the state is configured on the device level.
We chose not to have an "unset" state for threaded, and not to wipe
the NAPI config clean when channels are explicitly disabled.
This means the persistent config structs "exist" even when their NAPIs
are not instantiated.

Differently put - the NAPI persistent state lives in the net_device
(ncfg == struct napi_config):

    ,--- [napi 0] - [napi 1]
 [dev]      |          |
    `--- [ncfg 0] - [ncfg 1]

so say we a device with 2 queues but only 1 enabled:

    ,--- [napi 0]
 [dev]      |
    `--- [ncfg 0] - [ncfg 1]

now we set the device to threaded=1:

    ,---------- [napi 0 (thr:1)]
 [dev(thr:1)]      |
    `---------- [ncfg 0 (thr:1)] - [ncfg 1 (thr:?)]

Since [ncfg 1] was not attached to a NAPI during configuration we
skipped it. If we create a NAPI for it later it will have the old
setting (presumably disabled). One could argue if this is right
or not "in principle", but it's definitely not how things worked
before per-NAPI config..

Fixes: 2677010e7793 ("Add support to set NAPI threaded for individual NAPI")
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Reviewed-by: Joe Damato <joe@dama.to>
Link: https://patch.msgid.link/20250809001205.1147153-3-kuba@kernel.org
Signed-off-by: Paolo Abeni <pabeni@redhat.com>

1 files changed, 4 insertions, 1 deletions

diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index 5e5de4b0a433..f3a3b761abfb 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -2071,6 +2071,8 @@ enum netdev_reg_state {
  *	@max_pacing_offload_horizon: max EDT offload horizon in nsec.
  *	@napi_config: An array of napi_config structures containing per-NAPI
  *		      settings.
+ *	@num_napi_configs:	number of allocated NAPI config structs,
+ *		always >= max(num_rx_queues, num_tx_queues).
  *	@gro_flush_timeout:	timeout for GRO layer in NAPI
  *	@napi_defer_hard_irqs:	If not zero, provides a counter that would
  *				allow to avoid NIC hard IRQ, on busy queues.
@@ -2482,8 +2484,9 @@ struct net_device {
 
 	u64			max_pacing_offload_horizon;
 	struct napi_config	*napi_config;
-	unsigned long		gro_flush_timeout;
+	u32			num_napi_configs;
 	u32			napi_defer_hard_irqs;
+	unsigned long		gro_flush_timeout;
 
 	/**
 	 * @up: copy of @state's IFF_UP, but safe to read with just @lock.