On 5/28/2021 3:31 AM, Zhu Yanjun wrote:
On Fri, May 28, 2021 at 3:47 AM Bob Pearson <rpearsonhpe@xxxxxxxxx> wrote:To create optimal code only want to use smp_load_acquire() and smp_store_release() for user indices in rxe_queue APIs since kernel indices are protected by locks which also act as memory barriers. By adding a type to the queues we can determine which indices need to be protected. Signed-off-by: Bob Pearson <rpearsonhpe@xxxxxxxxx> --- drivers/infiniband/sw/rxe/rxe_cq.c | 4 +++- drivers/infiniband/sw/rxe/rxe_qp.c | 12 ++++++++---- drivers/infiniband/sw/rxe/rxe_queue.c | 8 ++++---- drivers/infiniband/sw/rxe/rxe_queue.h | 13 ++++++++++--- drivers/infiniband/sw/rxe/rxe_srq.c | 4 +++- 5 files changed, 28 insertions(+), 13 deletions(-) diff --git a/drivers/infiniband/sw/rxe/rxe_cq.c b/drivers/infiniband/sw/rxe/rxe_cq.c index b315ebf041ac..1d4d8a31bc12 100644 --- a/drivers/infiniband/sw/rxe/rxe_cq.c +++ b/drivers/infiniband/sw/rxe/rxe_cq.c @@ -59,9 +59,11 @@ int rxe_cq_from_init(struct rxe_dev *rxe, struct rxe_cq *cq, int cqe, struct rxe_create_cq_resp __user *uresp) { int err; + enum queue_type type; + type = uresp ? QUEUE_TYPE_TO_USER : QUEUE_TYPE_KERNEL;When is QUEUE_TYPE_TO_USER used? and when is QUEUE_TYPE_FROM_USER is used? Zhu Yanjun
QUEUE_TYPE_FROM_USER is used for user space send, recv and shared receive work queues. QUEUE_TYPE_TO_USER is used for user space completion queues. QUEUE_TYPE_KERNEL is used for kernel verbs consumers for any queue.
Bob
