[dpdk-dev] [PATCH v3] pci/vfio: allow mapping MSI-X BARs if kernel allows it
Thomas Monjalon
thomas at monjalon.net
Thu Oct 4 00:40:06 CEST 2018
20/09/2018 15:11, Anatoly Burakov:
> Currently, DPDK will skip mapping some areas (or even an entire BAR)
> if MSI-X table happens to be in them but is smaller than page size.
>
> Kernels 4.16+ will allow mapping MSI-X BARs [1], and will report this
> as a capability flag. Capability flags themselves are also only
> supported since kernel 4.6 [2].
>
> This commit will introduce support for checking VFIO capabilities,
> and will use it to check if we are allowed to map BARs with MSI-X
> tables in them, along with backwards compatibility for older
> kernels, including a workaround for a variable rename in VFIO
> region info structure [3].
>
> [1] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/
> linux.git/commit/?id=a32295c612c57990d17fb0f41e7134394b2f35f6
>
> [2] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/
> linux.git/commit/?id=c84982adb23bcf3b99b79ca33527cd2625fbe279
>
> [3] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/
> linux.git/commit/?id=ff63eb638d63b95e489f976428f1df01391e15e4
>
> Signed-off-by: Anatoly Burakov <anatoly.burakov at intel.com>
Applied, thanks
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