From: Moni Shoua <monis@xxxxxxxxxxxx>
One of the conditions to recognize an implicit ODP MR in kernel is
having length of UINT64_MAX. Since the type of the parameter 'length'
in ibv_reg_mr() is size_t which is 32 bit long, it is impossible for
an application that runs on a 32 bit system to pass this value to the
library.
To solve this, let ibv_cmd_reg_mr() replace SIZE_MAX with UINT64_MAX
when building the command to the kernel. On 64 bit systems this has no
effect. On 32 bit systems set a value that the kernel understands as a
request for implicit ODP MR.
Signed-off-by: Moni Shoua <monis@xxxxxxxxxxxx>
Signed-off-by: Yishai Hadas <yishaih@xxxxxxxxxxxx>
---
libibverbs/cmd.c | 10 ++++++++++
1 file changed, 10 insertions(+)
diff --git a/libibverbs/cmd.c b/libibverbs/cmd.c
index ec551e2..7bcaeea 100644
--- a/libibverbs/cmd.c
+++ b/libibverbs/cmd.c
@@ -336,6 +336,16 @@ int ibv_cmd_reg_mr(struct ibv_pd *pd, void *addr, size_t length,
cmd->start = (uintptr_t) addr;
cmd->length = length;
+ /* On demand access and entire address space means implicit.
+ * In that case set the value in the command to what kernel expects.
+ */
+ if (access & IBV_ACCESS_ON_DEMAND) {
+ if (length == SIZE_MAX && addr)
+ return EINVAL;
+ if (length == SIZE_MAX)
+ cmd->length = UINT64_MAX;
+ }
+
cmd->hca_va = hca_va;
cmd->pd_handle = pd->handle;
cmd->access_flags = access;
--
1.8.3.1
