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
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
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
Currently, rxe_responder() directly calls the function to execute Atomic
operations. This need to be modified to insert some conditional branches
for the new RDMA Write operation and the ODP feature.
Signed-off-by: Daisuke Matsuda
---
drivers/infiniband/sw/rxe/rxe_resp.c | 102 +-
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 workqueues, but still allows direct-
call of
ib_umem_odp_map_dma_single_page(), which has been used only by the mlx5
driver, holds umem_mutex on success and releases on failure. This
behavior is not convenient for other drivers to use it, so change it to
always retain mutex on return.
Signed-off-by: Daisuke Matsuda
---
drivers/infiniband/c
Hi everyone,
This patch series implements the On-Demand Paging feature on SoftRoCE(rxe)
driver, which has been available only in mlx5 driver[1] so far.
[Overview]
When applications register a memory region(MR), RDMA drivers normally pin
pages in the MR so that physical addresses are never changed
On page invalidation, an MMU notifier callback is invoked to unmap DMA
addresses and update 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 | 3 ++-
drivers/infiniband/sw/rxe/rxe_odp.c | 34
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