In order to implement On-Demand Paging on the rxe driver, triple tasklets
(requester, responder, and completer) must be allowed to sleep so that they
can trigger page fault when pages being accessed are not present.
This patch replaces the tasklets with a workqueue, but still allows direct-
call o
This patch series implements the On-Demand Paging feature on SoftRoCE(rxe)
driver, which has been available only in mlx5 driver[1] so far.
As an important change, it is necessary to convert triple tasklets
(requester, responder and completer) to workqueue because they must be
able to sleep in orde
Currently, rxe_responder() directly calls the function to execute Atomic
operations. This need to be modified to insert some conditional branches
for the ODP feature. Additionally, rxe_resp.h is newly added to be used by
rxe_odp.c in near future.
Signed-off-by: Daisuke Matsuda
---
drivers/infini
Both responder and completer can sleep to execute page-fault when used
with ODP, and page-fault handler can be invoked when they are going to
access user MRs, so works must be scheduled in such cases.
Signed-off-by: Daisuke Matsuda
---
drivers/infiniband/sw/rxe/rxe_comp.c | 20 ++
On page invalidation, an MMU notifier callback is invoked to unmap DMA
addresses and update the driver page table(umem_odp->dma_list). The
callback is registered when an ODP-enabled MR is created.
Signed-off-by: Daisuke Matsuda
---
drivers/infiniband/sw/rxe/Makefile | 2 ++
drivers/infiniband/
Allow applications to register an ODP-enabled MR, in which case the flag
IB_ACCESS_ON_DEMAND is passed to rxe_reg_user_mr(). However, there is no
RDMA operation supported right now. They will be enabled later in the
subsequent two patches.
rxe_odp_do_pagefault() is called to initialize an ODP-enab
rxe_mr_copy() is used widely to copy data to/from a user MR. requester uses
it to load payloads of requesting packets; responder uses it to process
Send, Write, and Read operaetions; completer uses it to copy data from
response packets of Read and Atomic operations to a user MR.
Allow these operat
Enable 'fetch and add' and 'compare and swap' operations to manipulate
data in an ODP-enabled MR. This is comprised of the following steps:
1. Check the driver page table(umem_odp->dma_list) to see if the target
page is both readable and writable.
2. If not, then trigger page fault to map the
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