netdev - [PATCH net-next v2 2/3] PCI/VPD: Change Chelsio T4 quirk to provide access to full virtual address space

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Date:   Fri, 5 Feb 2021 15:26:25 +0100
From:   Heiner Kallweit <hkallweit1@...il.com>
To:     Raju Rangoju <rajur@...lsio.com>, Jakub Kicinski <kuba@...nel.org>,
        David Miller <davem@...emloft.net>,
        Bjorn Helgaas <bhelgaas@...gle.com>
Cc:     "linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: [PATCH net-next v2 2/3] PCI/VPD: Change Chelsio T4 quirk to provide
 access to full virtual address space

cxgb4 uses the full VPD address space for accessing its EEPROM (with some
mapping, see t4_eeprom_ptov()). In cudbg_collect_vpd_data() it sets the
VPD len to 32K (PCI_VPD_MAX_SIZE), and then back to 2K (CUDBG_VPD_PF_SIZE).
Having official (structured) and inofficial (unstructured) VPD data
violates the PCI spec, let's set VPD len according to all data that can be
accessed via PCI VPD access, no matter of its structure.

Signed-off-by: Heiner Kallweit <hkallweit1@...il.com>
---
 drivers/pci/vpd.c | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/drivers/pci/vpd.c b/drivers/pci/vpd.c
index 7915d10f9..06a7954d0 100644
--- a/drivers/pci/vpd.c
+++ b/drivers/pci/vpd.c
@@ -633,9 +633,8 @@ static void quirk_chelsio_extend_vpd(struct pci_dev *dev)
 	/*
 	 * If this is a T3-based adapter, there's a 1KB VPD area at offset
 	 * 0xc00 which contains the preferred VPD values.  If this is a T4 or
-	 * later based adapter, the special VPD is at offset 0x400 for the
-	 * Physical Functions (the SR-IOV Virtual Functions have no VPD
-	 * Capabilities).  The PCI VPD Access core routines will normally
+	 * later based adapter, provide access to the full virtual EEPROM
+	 * address space. The PCI VPD Access core routines will normally
 	 * compute the size of the VPD by parsing the VPD Data Structure at
 	 * offset 0x000.  This will result in silent failures when attempting
 	 * to accesses these other VPD areas which are beyond those computed
@@ -644,7 +643,7 @@ static void quirk_chelsio_extend_vpd(struct pci_dev *dev)
 	if (chip == 0x0 && prod >= 0x20)
 		pci_set_vpd_size(dev, 8192);
 	else if (chip >= 0x4 && func < 0x8)
-		pci_set_vpd_size(dev, 2048);
+		pci_set_vpd_size(dev, PCI_VPD_MAX_SIZE);
 }
 
 DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_CHELSIO, PCI_ANY_ID,
-- 
2.30.0