[PATCH 4/4] nvme-tcp: switch to 'cpu' affinity scope for unbound workqueues

[Hannes Reinecke <hare@kernel.org>]

We should switch to the 'cpu' affinity scope when using the 'wq_unbound'
parameter as this allows us to keep I/O locality and improve performance.

Signed-off-by: Hannes Reinecke <hare@kernel.org>
---
 drivers/nvme/host/tcp.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/nvme/host/tcp.c b/drivers/nvme/host/tcp.c
index df184004a514..889a5a28e3b7 100644
--- a/drivers/nvme/host/tcp.c
+++ b/drivers/nvme/host/tcp.c
@@ -2812,6 +2812,11 @@ static struct nvme_tcp_ctrl *nvme_tcp_alloc_ctrl(struct device *dev,
 		nvme_put_ctrl(&ctrl->ctrl);
 		return ERR_PTR(-ENOMEM);
 	}
+	if (wq_unbound) {
+		ret = workqueue_unbound_affinity_scope(ctrl->io_wq, WQ_AFFN_CPU);
+		if (ret)
+			pr_warn("Failed to set 'cpu' workqueue affinity\n");
+	}
 
 	return ctrl;
 out_kfree_queues:
-- 
2.35.3