netdev - [PATCH net] net: atlantic: use irq_update_affinity

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-Id: <20241107120739.415743-1-mheib@redhat.com>
Date: Thu,  7 Nov 2024 14:07:39 +0200
From: Mohammad Heib <mheib@...hat.com>
To: netdev@...r.kernel.org,
	irusskikh@...vell.com
Cc: Mohammad Heib <mheib@...hat.com>
Subject: [PATCH net] net: atlantic: 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. atlantic device reopening will resets the affinity
   in aq_ndev_open().

3. atlantic 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@...hat.com>
---
 drivers/net/ethernet/aquantia/atlantic/aq_pci_func.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/net/ethernet/aquantia/atlantic/aq_pci_func.c b/drivers/net/ethernet/aquantia/atlantic/aq_pci_func.c
index 43c71f6b314f..08630ee94251 100644
--- a/drivers/net/ethernet/aquantia/atlantic/aq_pci_func.c
+++ b/drivers/net/ethernet/aquantia/atlantic/aq_pci_func.c
@@ -162,8 +162,8 @@ int aq_pci_func_alloc_irq(struct aq_nic_s *self, unsigned int i,
 		self->msix_entry_mask |= (1 << i);

 		if (pdev->msix_enabled && affinity_mask)
-			irq_set_affinity_hint(pci_irq_vector(pdev, i),
-					      affinity_mask);
+			irq_update_affinity_hint(pci_irq_vector(pdev, i),
+						 affinity_mask);
 	}

 	return err;
@@ -187,7 +187,7 @@ void aq_pci_func_free_irqs(struct aq_nic_s *self)
 			continue;

 		if (pdev->msix_enabled)
-			irq_set_affinity_hint(pci_irq_vector(pdev, i), NULL);
+			irq_update_affinity_hint(pci_irq_vector(pdev, i), NULL);
 		free_irq(pci_irq_vector(pdev, i), irq_data);
 		self->msix_entry_mask &= ~(1U << i);
 	}
-- 
2.34.3