linux-kernel - [PATCH V1 8/9] bnxt_en: Add TPH support in BNXT driver

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Date: Thu, 9 May 2024 11:27:40 -0500
From: Wei Huang <wei.huang2@....com>
To: <linux-pci@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<linux-doc@...r.kernel.org>, <netdev@...r.kernel.org>
CC: <bhelgaas@...gle.com>, <corbet@....net>, <davem@...emloft.net>,
	<edumazet@...gle.com>, <kuba@...nel.org>, <pabeni@...hat.com>,
	<alex.williamson@...hat.com>, <gospo@...adcom.com>,
	<michael.chan@...adcom.com>, <ajit.khaparde@...adcom.com>,
	<manoj.panicker2@....com>, <Eric.VanTassell@....com>, <wei.huang2@....com>
Subject: [PATCH V1 8/9] bnxt_en: Add TPH support in BNXT driver

From: Manoj Panicker <manoj.panicker2@....com>

As a usage example, this patch implements TPH support in Broadcom BNXT
device driver by invoking pcie_tph_set_st() function when interrupt
affinity is changed.

Reviewed-by: Ajit Khaparde <ajit.khaparde@...adcom.com>
Reviewed-by: Andy Gospodarek <andrew.gospodarek@...adcom.com>
Reviewed-by: Wei Huang <wei.huang2@....com>
Signed-off-by: Manoj Panicker <manoj.panicker2@....com>
---
 drivers/net/ethernet/broadcom/bnxt/bnxt.c | 51 +++++++++++++++++++++++
 drivers/net/ethernet/broadcom/bnxt/bnxt.h |  4 ++
 2 files changed, 55 insertions(+)

diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt.c b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
index 2c2ee79c4d77..be9c17566fb4 100644
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt.c
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
@@ -55,6 +55,7 @@
 #include <net/page_pool/helpers.h>
 #include <linux/align.h>
 #include <net/netdev_queues.h>
+#include <linux/pci-tph.h>
 
 #include "bnxt_hsi.h"
 #include "bnxt.h"
@@ -10491,6 +10492,7 @@ static void bnxt_free_irq(struct bnxt *bp)
 				free_cpumask_var(irq->cpu_mask);
 				irq->have_cpumask = 0;
 			}
+			irq_set_affinity_notifier(irq->vector, NULL);
 			free_irq(irq->vector, bp->bnapi[i]);
 		}
 
@@ -10498,6 +10500,45 @@ static void bnxt_free_irq(struct bnxt *bp)
 	}
 }
 
+static void bnxt_rtnl_lock_sp(struct bnxt *bp);
+static void bnxt_rtnl_unlock_sp(struct bnxt *bp);
+static void bnxt_irq_affinity_notify(struct irq_affinity_notify *notify,
+				     const cpumask_t *mask)
+{
+	struct bnxt_irq *irq;
+
+	irq = container_of(notify, struct bnxt_irq, affinity_notify);
+	cpumask_copy(irq->cpu_mask, mask);
+
+	if (!pcie_tph_set_st(irq->bp->pdev, irq->msix_nr,
+			     cpumask_first(irq->cpu_mask),
+			     TPH_MEM_TYPE_VM, PCI_TPH_REQ_TPH_ONLY))
+		pr_err("error in configuring steering tag\n");
+
+	if (netif_running(irq->bp->dev)) {
+		rtnl_lock();
+		bnxt_close_nic(irq->bp, false, false);
+		bnxt_open_nic(irq->bp, false, false);
+		rtnl_unlock();
+	}
+}
+
+static void bnxt_irq_affinity_release(struct kref __always_unused *ref)
+{
+}
+
+static inline void __bnxt_register_notify_irqchanges(struct bnxt_irq *irq)
+{
+	struct irq_affinity_notify *notify;
+
+	notify = &irq->affinity_notify;
+	notify->irq = irq->vector;
+	notify->notify = bnxt_irq_affinity_notify;
+	notify->release = bnxt_irq_affinity_release;
+
+	irq_set_affinity_notifier(irq->vector, notify);
+}
+
 static int bnxt_request_irq(struct bnxt *bp)
 {
 	int i, j, rc = 0;
@@ -10543,6 +10584,7 @@ static int bnxt_request_irq(struct bnxt *bp)
 			int numa_node = dev_to_node(&bp->pdev->dev);
 
 			irq->have_cpumask = 1;
+			irq->msix_nr = map_idx;
 			cpumask_set_cpu(cpumask_local_spread(i, numa_node),
 					irq->cpu_mask);
 			rc = irq_set_affinity_hint(irq->vector, irq->cpu_mask);
@@ -10552,6 +10594,15 @@ static int bnxt_request_irq(struct bnxt *bp)
 					    irq->vector);
 				break;
 			}
+
+			if (!pcie_tph_set_st(bp->pdev, i,
+					     cpumask_first(irq->cpu_mask),
+					     TPH_MEM_TYPE_VM, PCI_TPH_REQ_TPH_ONLY)) {
+				netdev_err(bp->dev, "error in setting steering tag\n");
+			} else {
+				irq->bp = bp;
+				__bnxt_register_notify_irqchanges(irq);
+			}
 		}
 	}
 	return rc;
diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt.h b/drivers/net/ethernet/broadcom/bnxt/bnxt.h
index dd849e715c9b..0d3442590bb4 100644
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt.h
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt.h
@@ -1195,6 +1195,10 @@ struct bnxt_irq {
 	u8		have_cpumask:1;
 	char		name[IFNAMSIZ + 2];
 	cpumask_var_t	cpu_mask;
+
+	int		msix_nr;
+	struct bnxt	*bp;
+	struct irq_affinity_notify affinity_notify;
 };
 
 #define HWRM_RING_ALLOC_TX	0x1
-- 
2.44.0