netdev - Re: [PATCH] PCI: Add ACS quirk for Broadcom BCM5750x NICs

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Message-ID: <20220609185811.GA524052@bhelgaas>
Date:   Thu, 9 Jun 2022 13:58:11 -0500
From:   Bjorn Helgaas <helgaas@...nel.org>
To:     Michael Chan <michael.chan@...adcom.com>
Cc:     davem@...emloft.net, bhelgaas@...gle.com, netdev@...r.kernel.org,
        linux-pci@...r.kernel.org, kuba@...nel.org, gospo@...adcom.com,
        Pavan Chebbi <pavan.chebbi@...adcom.com>
Subject: Re: [PATCH] PCI: Add ACS quirk for Broadcom BCM5750x NICs

On Thu, Jun 09, 2022 at 01:41:47PM -0400, Michael Chan wrote:
> From: Pavan Chebbi <pavan.chebbi@...adcom.com>
> 
> The Broadcom BCM5750x NICs may be multi-function devices.  They do
> not advertise ACS capability. Peer-to-peer transactions are not
> possible between the individual functions, so it is safe to treat
> them as fully isolated.
> 
> Add an ACS quirk for these devices so the functions can be in
> independent IOMMU groups and attached individually to userspace
> applications using VFIO.
> 
> Signed-off-by: Pavan Chebbi <pavan.chebbi@...adcom.com>
> Signed-off-by: Michael Chan <michael.chan@...adcom.com>

Applied to pci/virtualization for v5.20, thanks!

> ---
>  drivers/pci/quirks.c | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c
> index 41aeaa235132..2e68f50bc7ae 100644
> --- a/drivers/pci/quirks.c
> +++ b/drivers/pci/quirks.c
> @@ -4924,6 +4924,9 @@ static const struct pci_dev_acs_enabled {
>  	{ PCI_VENDOR_ID_AMPERE, 0xE00C, pci_quirk_xgene_acs },
>  	/* Broadcom multi-function device */
>  	{ PCI_VENDOR_ID_BROADCOM, 0x16D7, pci_quirk_mf_endpoint_acs },
> +	{ 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, 0xD714, pci_quirk_brcm_acs },
>  	/* Amazon Annapurna Labs */
>  	{ PCI_VENDOR_ID_AMAZON_ANNAPURNA_LABS, 0x0031, pci_quirk_al_acs },
> -- 
> 2.18.1
>