This patch series add a dma-buf support for rxe driver.
A dma-buf based memory registering has beed introduced to use the memory region that lack of associated page structures (e.g. device memory and CMA managed memory) [1]. However, to use the dma-buf based memory, each rdma device drivers require add some implementation. The rxe driver has not support yet.
[1] https://www.spinics.net/lists/linux-rdma/msg98592.html
To enable to use the dma-buf memory in rxe rdma device, add some changes and implementation in this patch series.
This series consists of two patches. The first patch changes the IB core to support for rdma drivers that has not dma device. The secound patch adds the dma-buf support to rxe driver.
Related user space RDMA library changes are provided as a separate patch.
v4: * Fix warnings, unused variable and casting v3: https://www.spinics.net/lists/linux-rdma/msg106776.html * Rebase to the latest linux-rdma 'for-next' branch (5.15.0-rc6+) * Fix to use dma-buf-map helpers v2: https://www.spinics.net/lists/linux-rdma/msg105928.html * Rebase to the latest linux-rdma 'for-next' branch (5.15.0-rc1+) * Instead of using a dummy dma_device to attach dma-buf, just store dma-buf to use software RDMA driver * Use dma-buf vmap() interface * Check to pass tests of rdma-core v1: https://www.spinics.net/lists/linux-rdma/msg105376.html * The initial patch set * Use ib_device as dma_device. * Use dma-buf dynamic attach interface * Add dma-buf support to rxe device
Shunsuke Mie (2): RDMA/umem: Change for rdma devices has not dma device RDMA/rxe: Add dma-buf support
drivers/infiniband/core/umem_dmabuf.c | 20 ++++- drivers/infiniband/sw/rxe/rxe_loc.h | 2 + drivers/infiniband/sw/rxe/rxe_mr.c | 113 ++++++++++++++++++++++++++ drivers/infiniband/sw/rxe/rxe_verbs.c | 34 ++++++++ include/rdma/ib_umem.h | 1 + 5 files changed, 166 insertions(+), 4 deletions(-)