This patch series corrects qp reference counting issues related to deferred execution of tasklets. These issues were discovered in attempting to resolve soft lockups of the rxe driver observed by Daisuke Matsuda in a version of the driver using work queues where the workqueue implementation was based on the current tasklet based driver. An attempt to find the root cause of those lockups lead to an error in the tasklet implementation that has been present since the driver went upstream. This patch series corrects that error. With this patch series applied the rxe driver is more stable and has run the test cases reported by Matsuda for over 24 hours without errors. The series also corrects some errors in qp reference counting related to qp cleanup. This series depends on the RDMA/rxe: Add error logging to rxe" series as a prerequisite. Link: https://lore.kernel.org/linux-rdma/TYCPR01MB845522FD536170D75068DD41E5099@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx/ Signed-off-by: Bob Pearson <rpearsonhpe@xxxxxxxxx> v2: This version of this series split off the changes to rxe debug code which have been submitted as "RDMA/rxe: Add error logging to rxe". One unrelated patch was dropped and other patches earlier included in a series to convert from tasklets to workqueues were moved into this series because they are relevant both for the tasklet version and the workqueue version of the driver. Bob Pearson (8): RDMA/rxe: Convert tasklet args to queue pairs RDMA/rxe: warn if refcnt zero in rxe_put RDMA/rxe: Cleanup reset state handling in rxe_resp.c RDMA/rxe: Cleanup error state handling in rxe_comp.c RDMA/rxe: Remove qp reference counting in tasks RDMA/rxe: Remove __rxe_do_task() RDMA/rxe: Make tasks schedule each other RDMA/rxe: Rewrite rxe_task.c drivers/infiniband/sw/rxe/rxe.h | 1 - drivers/infiniband/sw/rxe/rxe_comp.c | 71 +++++-- drivers/infiniband/sw/rxe/rxe_loc.h | 6 +- drivers/infiniband/sw/rxe/rxe_pool.c | 2 + drivers/infiniband/sw/rxe/rxe_qp.c | 56 ++---- drivers/infiniband/sw/rxe/rxe_req.c | 12 +- drivers/infiniband/sw/rxe/rxe_resp.c | 114 ++++++------ drivers/infiniband/sw/rxe/rxe_task.c | 268 +++++++++++++++++++++------ drivers/infiniband/sw/rxe/rxe_task.h | 23 ++- 9 files changed, 352 insertions(+), 201 deletions(-) base-commit: bceed5834cd43a0ed67e35ec16197a5c882d3a6d -- 2.37.2
