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Date: Fri, 10 May 2024 08:40:34 +0530
From: Somnath Kotur <somnath.kotur@...adcom.com>
To: Wei Huang <wei.huang2@....com>
Cc: linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-doc@...r.kernel.org, netdev@...r.kernel.org, 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
Subject: Re: [PATCH V1 8/9] bnxt_en: Add TPH support in BNXT driver
On Thu, May 9, 2024 at 10:02 PM Wei Huang <wei.huang2@....com> wrote:
>
> 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
>
>
Reviewed-by: Somnath Kotur <somnath.kotur@...adcom.com>
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