Re: [PATCH] pci_cap_init: add 82599 VF quirk

["Michael S. Tsirkin" <mst@redhat.com>]

On Tue, Oct 04, 2011 at 03:02:18PM -0400, Donald Dutile wrote:
> v2: Updated to reflect changes requested by reviewers.
>  
> Add check when PCIe capability structure is version 0
> and VID and DID is 82599 VF.  In this case, the size
> of the PCIe cap structure should be the same as a version 2
> cap structure.
> Documented in 82599 Errata 35, and is still marked "No Fix".
> According to Intel, it's in silicon not fw, and needs a sw workaround.
> 
> Signed-off-by: Donald Dutile <ddutile@redhat.com>


Acked-by: Michael S. Tsirkin <mst@redhat.com>

> ---
>  hw/device-assignment.c |   17 +++++++++++++++--
>  1 files changed, 15 insertions(+), 2 deletions(-)
> 
> diff --git a/hw/device-assignment.c b/hw/device-assignment.c
> index 288f80c..d3d8d36 100644
> --- a/hw/device-assignment.c
> +++ b/hw/device-assignment.c
> @@ -1260,7 +1260,7 @@ static int assigned_device_pci_cap_init(PCIDevice *pci_dev)
>      }
>  
>      if ((pos = pci_find_cap_offset(pci_dev, PCI_CAP_ID_EXP, 0))) {
> -        uint8_t version, size;
> +        uint8_t version, size = 0;
>          uint16_t type, devctl, lnkcap, lnksta;
>          uint32_t devcap;
>  
> @@ -1287,7 +1287,20 @@ static int assigned_device_pci_cap_init(PCIDevice *pci_dev)
>                          "non-standard size 0x%x; std size should be 0x3c \n",
>                           __func__, PCI_CAP_ID_EXP, size);
>              }
> -        } else {
> +        } else if (version == 0) {
> +            uint16_t vid, did;
> +            vid = pci_get_word(pci_dev->config + PCI_VENDOR_ID);
> +            did = pci_get_word(pci_dev->config + PCI_DEVICE_ID);
> +            if (vid == PCI_VENDOR_ID_INTEL && did == 0x10ed) {
> +                /*
> +                 * quirk for Intel 82599 VF with invalid PCIe capability
> +                 * version, should really be version 2 (same as PF)
> +                 */
> +                size = 0x3c;
> +            }
> +        }
> +
> +        if (size == 0) {
>              fprintf(stderr,
>                      "%s: Unsupported PCI express capability version %d\n",
>                      __func__, version);
> -- 
> 1.7.1