[dpdk-dev] [PATCH] pci: properly parse 32-bit domain numbers
Stephen Hemminger
stephen at networkplumber.org
Tue May 12 20:16:28 CEST 2020
On Tue, May 12, 2020 at 3:30 pm, Darek Stojaczyk
<dariusz.stojaczyk at intel.com> wrote:
> The parsing code was bailing on domains greater than UINT16_MAX,
> but domain numbers like that are still valid and present on some
> systems.
> One example is Intel VMD (Volume Management Device), which acts
> somewhat
> as a software-managed PCI switch and its upstream linux driver assigns
> all downstream devices a PCI domain of 0x10000.
>
> Parsing a BDF like 10000:01:00.0 was failing before. To fix it,
> increase
> the upper limit of domain number to UINT32_MAX. This matches the size
> of
> struct rte_pci_addr->domain (uint32).
>
> Signed-off-by: Darek Stojaczyk <dariusz.stojaczyk at intel.com
> <mailto:dariusz.stojaczyk at intel.com>>
> ---
> lib/librte_pci/rte_pci.c | 4 ++--
> 1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/lib/librte_pci/rte_pci.c b/lib/librte_pci/rte_pci.c
> index d1ab6b414d..ad2cdfebb2 100644
> --- a/lib/librte_pci/rte_pci.c
> +++ b/lib/librte_pci/rte_pci.c
> @@ -72,9 +72,9 @@ pci_dbdf_parse(const char *input, struct
> rte_pci_addr *dev_addr)
>
> errno = 0;
> val = strtoul(in, &end, 16);
> - if (errno != 0 || end[0] != ':' || val > UINT16_MAX)
> + if (errno != 0 || end[0] != ':' || val > UINT32_MAX)
> return -EINVAL;
> - dev_addr->domain = (uint16_t)val;
> + dev_addr->domain = (uint32_t)val;
> in = end + 1;
> in = get_u8_pciaddr_field(in, &dev_addr->bus, ':');
> if (in == NULL)
> --
> 2.17.1
Agree this came up before on Hyper-V as well. It meant fixing libpci.
Not sure the cast of val is necessary, other than an attempt to silence
some static checker
about implicit type conversion causing loss of precision.
>
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