diff options
| author | Andrew Boyer <andrew.boyer@dell.com> | 2016-11-23 20:39:21 +0300 |
|---|---|---|
| committer | Doug Ledford <dledford@redhat.com> | 2016-12-13 00:31:45 +0300 |
| commit | d4fb59256ac03d84f68e36c430b58d6fc76dd651 (patch) | |
| tree | 439d45878decc2d4ea3eed161be54dffb034d87f /drivers/infiniband/sw/rxe/rxe_mr.c | |
| parent | d38eb801aa145aedf4b97e8e0bb2e65763aa6149 (diff) | |
| download | linux-d4fb59256ac03d84f68e36c430b58d6fc76dd651.tar.xz | |
IB/rxe: Add support for zero-byte operations
The last_psn algorithm fails in the zero-byte case: it calculates
first_psn = N, last_psn = N-1. This makes the operation unretryable since
the res structure will fail the (first_psn <= psn <= last_psn) test in
find_resource().
While here, use BTH_PSN_MASK to mask the calculated last_psn.
Signed-off-by: Andrew Boyer <andrew.boyer@dell.com>
Reviewed-by: Moni Shoua <monis@mellanox.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>
Diffstat (limited to 'drivers/infiniband/sw/rxe/rxe_mr.c')
| -rw-r--r-- | drivers/infiniband/sw/rxe/rxe_mr.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/infiniband/sw/rxe/rxe_mr.c b/drivers/infiniband/sw/rxe/rxe_mr.c index 1869152f1d23..d0faca294006 100644 --- a/drivers/infiniband/sw/rxe/rxe_mr.c +++ b/drivers/infiniband/sw/rxe/rxe_mr.c @@ -355,6 +355,9 @@ int rxe_mem_copy(struct rxe_mem *mem, u64 iova, void *addr, int length, size_t offset; u32 crc = crcp ? (*crcp) : 0; + if (length == 0) + return 0; + if (mem->type == RXE_MEM_TYPE_DMA) { u8 *src, *dest; |