Re: Can a PF driver access the VF config space, BAR(MMIO) etc?
Hi, Thanks so much for the quick reply! This is really helpful. I will try to do the same and would get back if i face any difficulties. Thanks again! Best Regards, Bob On Wed, Sep 24, 2014 at 11:12 PM, Sunil Kovvuri sunil.kovv...@gmail.com wrote: If you anyway want to simulate VF functionality in PF driver itself, i am not sure why do you need to access VF's config space from PF. FYI, VF's BAR(MMIO) are not used, MMIO regions are carved using VF BARs in PF's SRIOV config space. VFx BAR0 = PF SRIOV BAR0 + BAR_SIZE * x (VF_NUMBER); For accessing VF's MMIO regions you can try mapping PF's pci_dev-resource[PCI_IOV_RESOURCES] and using above formula to get exact MMIO base for corresponding VF. Regards, Sunil. On Wed, Sep 24, 2014 at 10:10 PM, Bob Biloxi iambobbil...@gmail.com wrote: Hi, I am new to writing pci sriov drivers. So i could use your help and expertise here As I understand once sriov is enabled, the PF driver can access the PF(Physical Function) configuration space, BAR(MMIO) etc and the VF driver can access the VF(Virtual Function) configuration space, BAR(MMIO)... Is it possible for a PF driver to access the VF config space, BAR(MMIO)? If yes, can you please point me as to what needs to be done in order to do it(existing driver sources will be really helpful). Now as to why this requirement is if the PF driver is ready and the VF driver is still under development, and I want to simulate the VF functionality from PF itself. It would be of immense help to me if anyone can help me understand my aforementioned query. Thanks a lot!!! Best Regards, Bob -- To unsubscribe from this list: send the line unsubscribe linux-pci in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line unsubscribe linux-rdma in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Can a PF driver access the VF config space, BAR(MMIO) etc?
Hi, I am new to writing pci sriov drivers. So i could use your help and expertise here As I understand once sriov is enabled, the PF driver can access the PF(Physical Function) configuration space, BAR(MMIO) etc and the VF driver can access the VF(Virtual Function) configuration space, BAR(MMIO)... Is it possible for a PF driver to access the VF config space, BAR(MMIO)? If yes, can you please point me as to what needs to be done in order to do it(existing driver sources will be really helpful). Now as to why this requirement is if the PF driver is ready and the VF driver is still under development, and I want to simulate the VF functionality from PF itself. It would be of immense help to me if anyone can help me understand my aforementioned query. Thanks a lot!!! Best Regards, Bob -- To unsubscribe from this list: send the line unsubscribe linux-rdma in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Re: Can a PF driver access the VF config space, BAR(MMIO) etc?
If you anyway want to simulate VF functionality in PF driver itself, i am not sure why do you need to access VF's config space from PF. FYI, VF's BAR(MMIO) are not used, MMIO regions are carved using VF BARs in PF's SRIOV config space. VFx BAR0 = PF SRIOV BAR0 + BAR_SIZE * x (VF_NUMBER); For accessing VF's MMIO regions you can try mapping PF's pci_dev-resource[PCI_IOV_RESOURCES] and using above formula to get exact MMIO base for corresponding VF. Regards, Sunil. On Wed, Sep 24, 2014 at 10:10 PM, Bob Biloxi iambobbil...@gmail.com wrote: Hi, I am new to writing pci sriov drivers. So i could use your help and expertise here As I understand once sriov is enabled, the PF driver can access the PF(Physical Function) configuration space, BAR(MMIO) etc and the VF driver can access the VF(Virtual Function) configuration space, BAR(MMIO)... Is it possible for a PF driver to access the VF config space, BAR(MMIO)? If yes, can you please point me as to what needs to be done in order to do it(existing driver sources will be really helpful). Now as to why this requirement is if the PF driver is ready and the VF driver is still under development, and I want to simulate the VF functionality from PF itself. It would be of immense help to me if anyone can help me understand my aforementioned query. Thanks a lot!!! Best Regards, Bob -- To unsubscribe from this list: send the line unsubscribe linux-pci in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line unsubscribe linux-rdma in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
