On Wed, 21 Aug 2013 18:13:21 -0700 Patrick Mahan <mahan at mahan.org> wrote:
> Has anyone contemplated providing access to the PCI config space > (pci_read_config_[byte|word|dword]) for DPDK? It seems simple to > perform, some preliminary testing by me seems to indicate opening > the /sys/bus/pci/devices/<domain:bus:loc.func>/config file, seeking > to the correct offset and reading off the value. > > It seems to be correctly returning expected values and sysfs-pci.txt > seems to indicate that this is RW so you can set values as well. > It would seem a natural to make the PCI support code in DPDK more > fully capable of porting PCI drivers. > > I realize that somethings should be avoid (ie. causing interrupts), > but I know that my device needs to modify bits in both the DEVCTL > field of the PCI config and a BAR0 register to ensure they have > the same value. > > Thoughts? > > Thanks, > > Patrick I played with that and it worked, but proved be unnecessary for the hardware we support. If your device needs it, then sure it makes sense to be supported genericly.
