netdev - [net-next PATCH] octeontx2-pf: Use only non-isolated cpus in irq affinity

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Date:   Mon, 25 Jul 2022 15:14:02 +0530
From:   Geetha sowjanya <gakula@...vell.com>
To:     <netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>
CC:     <davem@...emloft.net>, <kuba@...nel.org>, <edumazet@...gle.com>,
        "Geetha sowjanya" <gakula@...vell.com>,
        Sunil Kovvuri Goutham <sgoutham@...vell.com>
Subject: [net-next PATCH] octeontx2-pf: Use only non-isolated cpus in irq affinity

This patch excludes the isolates cpus from the cpus list
while setting up TX/RX queue interrupts affinity

Signed-off-by: Geetha sowjanya <gakula@...vell.com>
Signed-off-by: Sunil Kovvuri Goutham <sgoutham@...vell.com>
---
 .../ethernet/marvell/octeontx2/nic/otx2_common.c    | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/marvell/octeontx2/nic/otx2_common.c b/drivers/net/ethernet/marvell/octeontx2/nic/otx2_common.c
index fb8db5888d2f..9886a02dd756 100644
--- a/drivers/net/ethernet/marvell/octeontx2/nic/otx2_common.c
+++ b/drivers/net/ethernet/marvell/octeontx2/nic/otx2_common.c
@@ -8,6 +8,7 @@
 #include <linux/interrupt.h>
 #include <linux/pci.h>
 #include <net/tso.h>
+#include <linux/sched/isolation.h>
 
 #include "otx2_reg.h"
 #include "otx2_common.h"
@@ -1657,9 +1658,16 @@ void otx2_set_cints_affinity(struct otx2_nic *pfvf)
 {
 	struct otx2_hw *hw = &pfvf->hw;
 	int vec, cpu, irq, cint;
+	cpumask_var_t mask;
+
+	if (!alloc_cpumask_var(&mask, GFP_KERNEL))
+		return;
+
+	cpumask_and(mask, cpu_online_mask,
+		    housekeeping_cpumask(HK_TYPE_DOMAIN));
+	cpu = cpumask_first(mask);
 
 	vec = hw->nix_msixoff + NIX_LF_CINT_VEC_START;
-	cpu = cpumask_first(cpu_online_mask);
 
 	/* CQ interrupts */
 	for (cint = 0; cint < pfvf->hw.cint_cnt; cint++, vec++) {
@@ -1671,10 +1679,11 @@ void otx2_set_cints_affinity(struct otx2_nic *pfvf)
 		irq = pci_irq_vector(pfvf->pdev, vec);
 		irq_set_affinity_hint(irq, hw->affinity_mask[vec]);
 
-		cpu = cpumask_next(cpu, cpu_online_mask);
+		cpu = cpumask_next(cpu, mask);
 		if (unlikely(cpu >= nr_cpu_ids))
 			cpu = 0;
 	}
+	free_cpumask_var(mask);
 }
 
 u16 otx2_get_max_mtu(struct otx2_nic *pfvf)
-- 
2.17.1