This commit introduces verbs for creating/destoying memory
regions which will allow new types of memory key operations such
as protected memory registration.
Indirect memory registration is registering several (one
of more) pre-registered memory regions in a specific layout.
The Indirect region may potentialy describe several regions
and some repitition format between them.
Protected Memory registration is registering a memory region
with various data integrity attributes which will describe protection
schemes that will be handled by the HCA in an offloaded manner.
A protected region will describe pre-registered regions for data,
protection block guards and the repetitive stride of them.
These memory regions will be applicable for a new REG_SIG_MR
work request introduced later in this patchset.
In the future these routines may replace or implement current memory
regions creation routines existing today:
- ib_reg_user_mr
- ib_alloc_fast_reg_mr
- ib_get_dma_mr
- ib_dereg_mr
Signed-off-by: Sagi Grimberg <sa...@mellanox.com>
---
drivers/infiniband/core/verbs.c | 39 +++++++++++++++++++++++++++++++++++++++
include/rdma/ib_verbs.h | 38 ++++++++++++++++++++++++++++++++++++++
2 files changed, 77 insertions(+), 0 deletions(-)
diff --git a/drivers/infiniband/core/verbs.c b/drivers/infiniband/core/verbs.c
index d4f6ddf..f4c3bfb 100644
--- a/drivers/infiniband/core/verbs.c
+++ b/drivers/infiniband/core/verbs.c
@@ -1072,6 +1072,45 @@ int ib_dereg_mr(struct ib_mr *mr)
}
EXPORT_SYMBOL(ib_dereg_mr);
+struct ib_mr *ib_create_mr(struct ib_pd *pd,
+ struct ib_mr_init_attr *mr_init_attr)
+{
+ struct ib_mr *mr;
+
+ if (!pd->device->create_mr)
+ return ERR_PTR(-ENOSYS);
+
+ mr = pd->device->create_mr(pd, mr_init_attr);
+
+ if (!IS_ERR(mr)) {
+ mr->device = pd->device;
+ mr->pd = pd;
+ mr->uobject = NULL;
+ atomic_inc(&pd->usecnt);
+ atomic_set(&mr->usecnt, 0);
+ }
+
+ return mr;
+}
+EXPORT_SYMBOL(ib_create_mr);
+
+int ib_destroy_mr(struct ib_mr *mr)
+{
+ struct ib_pd *pd;
+ int ret;
+
+ if (atomic_read(&mr->usecnt))
+ return -EBUSY;
+
+ pd = mr->pd;
+ ret = mr->device->destroy_mr(mr);
+ if (!ret)
+ atomic_dec(&pd->usecnt);
+
+ return ret;
+}
+EXPORT_SYMBOL(ib_destroy_mr);
+
struct ib_mr *ib_alloc_fast_reg_mr(struct ib_pd *pd, int max_page_list_len)
{
struct ib_mr *mr;
diff --git a/include/rdma/ib_verbs.h b/include/rdma/ib_verbs.h
index 979874c..81d1406 100644
--- a/include/rdma/ib_verbs.h
+++ b/include/rdma/ib_verbs.h
@@ -457,6 +457,22 @@ int ib_rate_to_mult(enum ib_rate rate) __attribute_const__;
*/
int ib_rate_to_mbps(enum ib_rate rate) __attribute_const__;
+enum ib_mr_create_flags {
+ IB_MR_SIGNATURE_EN = 1,
+};
+
+/**
+ * ib_mr_init_attr - Memory region init attributes passed to routine
+ * ib_create_mr.
+ * @max_reg_descriptors: max number of registration descriptors that
+ * may be used with registration work requests.
+ * @flags: MR creation flags bit mask.
+ */
+struct ib_mr_init_attr {
+ int max_reg_descriptors;
+ u32 flags;
+};
+
/**
* mult_to_ib_rate - Convert a multiple of 2.5 Gbit/sec to an IB rate
* enum.
@@ -1374,6 +1390,9 @@ struct ib_device {
int (*query_mr)(struct ib_mr *mr,
struct ib_mr_attr *mr_attr);
int (*dereg_mr)(struct ib_mr *mr);
+ int (*destroy_mr)(struct ib_mr *mr);
+ struct ib_mr * (*create_mr)(struct ib_pd *pd,
+ struct ib_mr_init_attr
*mr_init_attr);
struct ib_mr * (*alloc_fast_reg_mr)(struct ib_pd *pd,
int max_page_list_len);
struct ib_fast_reg_page_list * (*alloc_fast_reg_page_list)(struct
ib_device *device,
@@ -2215,6 +2234,25 @@ int ib_query_mr(struct ib_mr *mr, struct ib_mr_attr
*mr_attr);
*/
int ib_dereg_mr(struct ib_mr *mr);
+
+/**
+ * ib_create_mr - Allocates a memory region that may be used for
+ * signature handover operations.
+ * @pd: The protection domain associated with the region.
+ * @mr_init_attr: memory region init attributes.
+ */
+struct ib_mr *ib_create_mr(struct ib_pd *pd,
+ struct ib_mr_init_attr *mr_init_attr);
+
+/**
+ * ib_destroy_mr - Destroys a memory region that was created using
+ * ib_create_mr and removes it from HW translation tables.
+ * @mr: The memory region to destroy.
+ *
+ * This function can fail, if the memory region has memory windows bound to it.
+ */
+int ib_destroy_mr(struct ib_mr *mr);
+
/**
* ib_alloc_fast_reg_mr - Allocates memory region usable with the
* IB_WR_FAST_REG_MR send work request.
--
1.7.8.2
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