diff options
| author |   Bob Pearson <rpearsonhpe@gmail.com> | 2021-06-07 23:25:47 -0500 |
|---|---|---|
| committer |   Jason Gunthorpe <jgg@nvidia.com> | 2021-06-16 20:51:17 -0300 |
| commit | beec0239c3fae5828cc2f4b8869d75d8b3e82ee7 (patch) | |
| tree | 29e260575c816a1b37afaf189a6b5310d94425e2 /drivers/infiniband/sw/rxe/rxe_mr.c | |
| parent | RDMA/rxe: Enable MW object pool (diff) | |
| download | linux-dev-beec0239c3fae5828cc2f4b8869d75d8b3e82ee7.tar.xz linux-dev-beec0239c3fae5828cc2f4b8869d75d8b3e82ee7.zip | |
RDMA/rxe: Add ib_alloc_mw and ib_dealloc_mw verbs
Add ib_alloc_mw and ib_dealloc_mw verbs APIs.
Added new file rxe_mw.c focused on MWs. Changed the 8 bit random key
generator. Added a cleanup routine for MWs. Added verbs routines to
ib_device_ops.
Link: https://lore.kernel.org/r/20210608042552.33275-5-rpearsonhpe@gmail.com
Signed-off-by: Bob Pearson <rpearsonhpe@gmail.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
Diffstat (limited to 'drivers/infiniband/sw/rxe/rxe_mr.c')
| -rw-r--r-- | drivers/infiniband/sw/rxe/rxe_mr.c | 20 |
1 files changed, 9 insertions, 11 deletions
diff --git a/drivers/infiniband/sw/rxe/rxe_mr.c b/drivers/infiniband/sw/rxe/rxe_mr.c index 373b46aab043..cfd35a442c10 100644 --- a/drivers/infiniband/sw/rxe/rxe_mr.c +++ b/drivers/infiniband/sw/rxe/rxe_mr.c @@ -7,19 +7,17 @@ #include "rxe.h" #include "rxe_loc.h" -/* - * lfsr (linear feedback shift register) with period 255 +/* Return a random 8 bit key value that is + * different than the last_key. Set last_key to -1 + * if this is the first key for an MR or MW */ -static u8 rxe_get_key(void) +u8 rxe_get_next_key(u32 last_key) { - static u32 key = 1; - - key = key << 1; - - key |= (0 != (key & 0x100)) ^ (0 != (key & 0x10)) - ^ (0 != (key & 0x80)) ^ (0 != (key & 0x40)); + u8 key; - key &= 0xff; + do { + get_random_bytes(&key, 1); + } while (key == last_key); return key; } @@ -47,7 +45,7 @@ int mr_check_range(struct rxe_mr *mr, u64 iova, size_t length) static void rxe_mr_init(int access, struct rxe_mr *mr) { - u32 lkey = mr->pelem.index << 8 | rxe_get_key(); + u32 lkey = mr->pelem.index << 8 | rxe_get_next_key(-1); u32 rkey = (access & IB_ACCESS_REMOTE) ? lkey : 0; mr->ibmr.lkey = lkey; |