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Message-ID: <20240403203526.GA1887417@bhelgaas>
Date: Wed, 3 Apr 2024 15:35:26 -0500
From: Bjorn Helgaas <helgaas@...nel.org>
To: Alexander Duyck <alexander.duyck@...il.com>
Cc: netdev@...r.kernel.org, Alexander Duyck <alexanderduyck@...com>,
kuba@...nel.org, davem@...emloft.net, pabeni@...hat.com
Subject: Re: [net-next PATCH 03/15] eth: fbnic: Allocate core device specific
structures and devlink interface
On Wed, Apr 03, 2024 at 01:08:37PM -0700, Alexander Duyck wrote:
> From: Alexander Duyck <alexanderduyck@...com>
>
> At the core of the fbnic device will be the devlink interface. This
> interface will eventually provide basic functionality in the event that
> there are any issues with the network interface.
>
> Add support for allocating the MSI-X vectors and setting up the BAR
> mapping. With this we can start enabling various subsytems and start
> brining up additional interfaces such the AXI fabric and the firmware
> mailbox.
> +int fbnic_alloc_irqs(struct fbnic_dev *fbd)
> +{
> + unsigned int wanted_irqs = FBNIC_NON_NAPI_VECTORS;
> + struct pci_dev *pdev = to_pci_dev(fbd->dev);
> + struct msix_entry *msix_entries;
> + int i, num_irqs;
> +
> + msix_entries = kcalloc(wanted_irqs, sizeof(*msix_entries), GFP_KERNEL);
> + if (!msix_entries)
> + return -ENOMEM;
> +
> + for (i = 0; i < wanted_irqs; i++)
> + msix_entries[i].entry = i;
> +
> + num_irqs = pci_enable_msix_range(pdev, msix_entries,
> + FBNIC_NON_NAPI_VECTORS + 1,
> + wanted_irqs);
FWIW, deprecated in favor of pci_alloc_irq_vectors().
> + if (num_irqs < 0) {
> + dev_err(fbd->dev, "Failed to allocate MSI-X entries\n");
> + kfree(msix_entries);
> + return num_irqs;
> + }
> +
> + if (num_irqs < wanted_irqs)
> + dev_warn(fbd->dev, "Allocated %d IRQs, expected %d\n",
> + num_irqs, wanted_irqs);
> +
> + fbd->msix_entries = msix_entries;
> + fbd->num_irqs = num_irqs;
> +
> + return 0;
> +}
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