Merge: nfp: use irq_update_affinity_hint()

MR: https://gitlab.com/redhat/centos-stream/src/kernel/centos-stream-9/-/merge_requests/6254

JIRA: https://issues.redhat.com/browse/RHEL-40873

commit d9e2e29
Author: Mohammad Heib <mheib@redhat.com>
Date:   Thu Nov 7 13:50:02 2024 +0200

    nfp: use irq_update_affinity_hint()

    irq_set_affinity_hint() is deprecated, Use irq_update_affinity_hint()
    instead. This removes the side-effect of actually applying the affinity.

    The driver does not really need to worry about spreading its IRQs across
    CPUs. The core code already takes care of that. when the driver applies the
    affinities by itself, it breaks the users' expectations:

    1. The user configures irqbalance with IRQBALANCE_BANNED_CPULIST in
       order to prevent IRQs from being moved to certain CPUs that run a
       real-time workload.

    2. nfp device reopening will resets the affinity
       in nfp_net_netdev_open().

    3. nfp has no idea about irqbalance's config, so it may move an IRQ to
       a banned CPU. The real-time workload suffers unacceptable latency.

    Signed-off-by: Mohammad Heib <mheib@redhat.com>
    Reviewed-by: Simon Horman <horms@kernel.org>
    Reviewed-by: Louis Peens <louis.peens@corigine.com>
    Link: https://patch.msgid.link/20241107115002.413358-1-mheib@redhat.com
    Signed-off-by: Jakub Kicinski <kuba@kernel.org>

Signed-off-by: Mohammad Heib <mheib@redhat.com>

Approved-by: José Ignacio Tornos Martínez <jtornosm@redhat.com>
Approved-by: Izabela Bakollari <ibakolla@redhat.com>
Approved-by: CKI KWF Bot <cki-ci-bot+kwf-gitlab-com@redhat.com>

Merged-by: Patrick Talbert <ptalbert@redhat.com>

Author: ptalbert

drivers/net/ethernet/netronome/nfp/nfp_net_common.c

@@ -823,7 +823,7 @@ nfp_net_prepare_vector(struct nfp_net *nn, struct nfp_net_r_vector *r_vec,
 	}
 	disable_irq(r_vec->irq_vector);
 
-	irq_set_affinity_hint(r_vec->irq_vector, &r_vec->affinity_mask);
+	irq_update_affinity_hint(r_vec->irq_vector, &r_vec->affinity_mask);
 
 	nn_dbg(nn, "RV%02d: irq=%03d/%03d\n", idx, r_vec->irq_vector,
 	       r_vec->irq_entry);
@@ -834,7 +834,7 @@ nfp_net_prepare_vector(struct nfp_net *nn, struct nfp_net_r_vector *r_vec,
 static void
 nfp_net_cleanup_vector(struct nfp_net *nn, struct nfp_net_r_vector *r_vec)
 {
-	irq_set_affinity_hint(r_vec->irq_vector, NULL);
+	irq_update_affinity_hint(r_vec->irq_vector, NULL);
 	nfp_net_napi_del(&nn->dp, r_vec);
 	free_irq(r_vec->irq_vector, r_vec);
 }