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

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Date:   Thu,  9 Jun 2022 13:41:47 -0400
From:   Michael Chan <michael.chan@...adcom.com>
To:     davem@...emloft.net, bhelgaas@...gle.com
Cc:     netdev@...r.kernel.org, linux-pci@...r.kernel.org, kuba@...nel.org,
        gospo@...adcom.com, Pavan Chebbi <pavan.chebbi@...adcom.com>
Subject: [PATCH] PCI: Add ACS quirk for Broadcom BCM5750x NICs

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>
---
 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


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