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IB/core: Introduce protected memory regions 

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.
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 <sagig@mellanox.com>
Signed-off-by: Roland Dreier <roland@purestorage.com>
hifive-unleashed-5.1
Sagi Grimberg 2014-02-23 14:19:04 +02:00 committed by Roland Dreier
parent eeb8461e36
commit 17cd3a2db8
2 changed files with 77 additions and 0 deletions
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39
drivers/infiniband/core/verbs.c
View File

@ -1169,6 +1169,45 @@ 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;

38
include/rdma/ib_verbs.h
View File

@ -461,6 +461,22 @@ 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.
@ -1407,6 +1423,9 @@ 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,
@ -2250,6 +2269,25 @@ 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.