Here is the reconnect support in vduse Kernel will allocate pages for reconnection. Userspace needs to use mmap to map the memory to userspace and use these pages to save the reconnect information. test passd in vduse+dpdk-testpmd change in V2 1. Address the comments from v1 2. Add the document for reconnect process change in V3 1. Move the vdpa_vq_state to the uAPI. vduse will use this to synchronize the vq info between the kernel and userspace app. 2. Add a new ioctl VDUSE_DEV_GET_CONFIG. userspace app use this to get config space 3. Rewrite the commit message. 4. Only save the address for the page address and remove the index. 5. remove the ioctl VDUSE_GET_RECONNECT_INFO, userspace app will use uAPI VDUSE_RECONNCT_MMAP_SIZE to mmap 6. Rewrite the document for the reconnect process to make it clearer. change in v4 1. Change the number of map pages to VQ numbers. UserSpace APP can define and maintain the structure for saving reconnection information in userspace. The kernel will not maintain this information. 2. Rewrite the document for the reconnect process to make it clearer. 3. add the new ioctl for VDUSE_DEV_GET_CONFIG/VDUSE_DEV_GET_STATUS change in V5 1. update the Documentation for vduse reconnection 2. merge the patch from Dan Carpenter <dan.carpenter@xxxxxxxxxx> vduse: Fix off by one in vduse_dev_mmap() 3. fix the wrong comment in the code Signed-off-by: Cindy Lu <lulu@xxxxxxxxxx> Cindy Lu (5): vduse: Add new ioctl VDUSE_DEV_GET_CONFIG vduse: Add new ioctl VDUSE_DEV_GET_STATUS vduse: Add function to get/free the pages for reconnection vduse: Add file operation for mmap Documentation: Add reconnect process for VDUSE Documentation/userspace-api/vduse.rst | 41 +++++++++ drivers/vdpa/vdpa_user/vduse_dev.c | 125 ++++++++++++++++++++++++++ include/uapi/linux/vduse.h | 5 ++ 3 files changed, 171 insertions(+) -- 2.43.0
