This patch set from Maor adds support for device hot plug. Sending V1 to handle some cleanup note came on github from Jason, details below. Hot plug is the method in which a new hardware becomes available in the system or is being removed from it. The IB device list is returned by ibv_get_device_list() from libibverbs. Today, this list is created once by scanning /sys/class/infiniband_verbs, the list is cached and never updated, no matter if there were hardware changes in the system. libibverbs must be able to provide the application access to new ibv_device objects, according to the recent system hardware changes. For this purpose, the device scanning logic, should be separated from the libibverbs singleton initialization step, an updated list should be returned upon any call to ibv_get_device_list(). User can call ibv_open_device() while holding this list (see man pages) and once ibv_free_device_list() is called libibverbs can release the unused ibv_device objects. Later, upon a call to ibv_close_device() the ibv_device object should be released. Currently, on ibv_free_device_list(), only the array is freed, while the ibv_device objects are never freed. This series comes to handle the above notes based on the discussion that followed an RFC on that. The solution: - The initialization part was separated from ibv_get_device_list(). - Upon a call to ibv_get_device_list() the sysfs is scanned to look for new/removed entries. - Same device is recognized based on name and timestamp creation. - libibverbs will maintain a ref count for each verbs_device object, once it became zero, it calls the provider library to release the 'strcut verbs_device' which it allocated before. For this purpose each provider library provide a function to release the verbs_device. Further details exist in the commit logs of the series. Pull request was sent: https://github.com/linux-rdma/rdma-core/pull/157 Changes from V0: #Patch #3: Use the introduced mutex also for the initialization step, dropping the pthread_once usage. Yishai Maor Gottlieb (5): utils: Add timespec compare utility verbs: Split ibverbs_init functionality verbs: Refresh cahced ibv_device list verbs: Avoid ibv_device memory leak providers: Add support for uninit_device for all providers debian/libibverbs1.symbols | 2 +- libibverbs/device.c | 50 +++++++---- libibverbs/driver.h | 6 ++ libibverbs/ibverbs.h | 5 +- libibverbs/init.c | 166 ++++++++++++++++++++++++------------- libibverbs/libibverbs.map | 2 +- providers/cxgb3/iwch.c | 10 ++- providers/cxgb4/dev.c | 10 ++- providers/hfi1verbs/hfiverbs.c | 10 ++- providers/hns/hns_roce_u.c | 10 ++- providers/i40iw/i40iw_umain.c | 10 ++- providers/ipathverbs/ipathverbs.c | 10 ++- providers/mlx4/mlx4.c | 8 ++ providers/mlx5/mlx5.c | 8 ++ providers/mthca/mthca.c | 10 ++- providers/nes/nes_umain.c | 9 +- providers/ocrdma/ocrdma_main.c | 10 ++- providers/qedr/qelr_main.c | 10 ++- providers/rxe/rxe.c | 8 ++ providers/vmw_pvrdma/pvrdma_main.c | 10 ++- srp_daemon/srp_daemon.h | 7 +- util/util.h | 6 ++ 22 files changed, 284 insertions(+), 93 deletions(-) -- 1.8.3.1 -- To unsubscribe from this list: send the line "unsubscribe linux-rdma" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
