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Re: [RFC PATCH v4 0/2] RDMA/rxe: Add dma-buf support

by Zhu Yanjun

在 2021/11/22 3:08, Shunsuke Mie 写道: > 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. > Hi, Shunsuke Mie I was revisiting your 2021 proposal around dma-buf integration with RDMA and the related discussions at the time. As you know, dma-buf usage in RDMA-related workflows has gained more traction recently, and we are seeing increasing interest in heterogeneous memory and cross-device buffer sharing. Given the changes in the ecosystem since then, I’m wondering whether you think the original direction might be worth reconsidering. Do you have any interest in continuing that line of work, or updating the design based on today’s context? If not, I’d still appreciate your perspective on what you see as the main blockers from the previous discussions, and whether you think the landscape has changed enough to justify another attempt. Depending on the direction, we may consider exploring dma-buf support in rxe or at the core level, but I’d prefer to first understand your view before moving forward. Zhu Yanjun > 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(-) >

2 months, 1 week

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2 months, 1 week

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by Jane Pamela

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2 months, 1 week