Hi Frank, On 15/10/21 2:10 am, Frank Li wrote: > Sorry, correct Linux-pci mail list address. > >> -----Original Message----- >> From: Frank Li >> Sent: Thursday, October 14, 2021 3:35 PM >> To: kishon@xxxxxx; kw@xxxxxxxxx; Sherry Sun <sherry.sun@xxxxxxx>; Richard >> Zhu <hongxing.zhu@xxxxxxx> >> Cc: inux-pci@xxxxxxxxxxxxxxx >> Subject: Linux PCIe EP NTB function >> >> Kishon: >> >> We use VOP(virtio over PCIe) communication between PCI RC and EP side. >> But VOP already removed and switch into NTB solution. >> I saw you submit patch and already accepted by community about pci- >> epf-ntb. >> >> According to document, whole system work as Device1 (PCI host) -> EP1 >> -> EP2 -> Device2(PCI host). >> But our user case is Device 1(RC Host) -> Device 2(EP). >> >> I am not sure how to apply ntb frame work into this user case. NTB by definition is PCIe RC-to-RC communication. For RC-to-EP, see pci_endpoint_test.c (RC) and pci-epf-test.c (EP) that provides sample endpoint usecase. One more RC<->EP communication model was built in [1], but that is not yet upstreamed. [1] -> https://lore.kernel.org/r/20200702082143.25259-1-kishon@xxxxxx Thanks, Kishon >> >> I think we can modify pci-epf-ntb to register a ntb devices. But I am >> not sure that this is recommunicate method. I think this user case is >> quite common. I don't want to implement a local solution. >> >> Any suggestion? >> >> >> Best regards >> Frank Li
