linux-kernel - Re: [PATCH] pci: Add ACS quirk for Broadcom BCM5760X NIC

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Message-ID: <20240513175131.GA1991153@bhelgaas>
Date: Mon, 13 May 2024 12:51:31 -0500
From: Bjorn Helgaas <helgaas@...nel.org>
To: Ajit Khaparde <ajit.khaparde@...adcom.com>
Cc: bhelgaas@...gle.com, linux-pci@...r.kernel.org,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
	andrew.gospodarek@...adcom.com, michael.chan@...adcom.com,
	kuba@...nel.org, davem@...emloft.net,
	Andy Gospodarek <gospo@...adcom.com>
Subject: Re: [PATCH] pci: Add ACS quirk for Broadcom BCM5760X NIC

On Fri, May 10, 2024 at 01:42:28PM -0700, Ajit Khaparde wrote:
> The Broadcom BCM5760X NIC may be a multi-function device.
> While it does not advertise an ACS capability, peer-to-peer
> transactions are not possible between the individual functions.
> So it is ok to treat them as fully isolated.
> 
> Add an ACS quirk for this device so the functions can be in independent
> IOMMU groups and attached individually to userspace applications using
> VFIO.
> 
> Signed-off-by: Ajit Khaparde <ajit.khaparde@...adcom.com>
> Reviewed-by: Andy Gospodarek <gospo@...adcom.com>

Looks like this was applied by Krzysztof to pci/acs for v6.10.

I'm hoping Broadcom is still working on using the standard ACS so we
don't have to add quirks forever:

https://lore.kernel.org/all/CACKFLinvohm+jRupNZAV=G+OHg1buXvLDrs0yGgPY3o6NB8biA@mail.gmail.com/#t

> ---
>  drivers/pci/quirks.c | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c
> index eff7f5df08e2..3d8aa3f709e2 100644
> --- a/drivers/pci/quirks.c
> +++ b/drivers/pci/quirks.c
> @@ -5099,6 +5099,10 @@ static const struct pci_dev_acs_enabled {
>  	{ PCI_VENDOR_ID_BROADCOM, 0x1750, pci_quirk_mf_endpoint_acs },
>  	{ PCI_VENDOR_ID_BROADCOM, 0x1751, pci_quirk_mf_endpoint_acs },
>  	{ PCI_VENDOR_ID_BROADCOM, 0x1752, pci_quirk_mf_endpoint_acs },
> +	{ PCI_VENDOR_ID_BROADCOM, 0x1760, pci_quirk_mf_endpoint_acs },
> +	{ PCI_VENDOR_ID_BROADCOM, 0x1761, pci_quirk_mf_endpoint_acs },
> +	{ PCI_VENDOR_ID_BROADCOM, 0x1762, pci_quirk_mf_endpoint_acs },
> +	{ PCI_VENDOR_ID_BROADCOM, 0x1763, pci_quirk_mf_endpoint_acs },
>  	{ PCI_VENDOR_ID_BROADCOM, 0xD714, pci_quirk_brcm_acs },
>  	/* Amazon Annapurna Labs */
>  	{ PCI_VENDOR_ID_AMAZON_ANNAPURNA_LABS, 0x0031, pci_quirk_al_acs },
> -- 
> 2.39.2 (Apple Git-143)
>