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IB/uverbs: Add read counters support

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This patch exposes the read counters verb to user space applications.  By
that verb the user can read the hardware counters which are associated
with the counters object.

The application needs to provide a sufficient memory to hold the
statistics.

Reviewed-by: Yishai Hadas <yishaih@mellanox.com>
Signed-off-by: Raed Salem <raeds@mellanox.com>
Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
This commit is contained in:
Raed Salem
2018-05-31 16:43:34 +03:00
committed by Leon Romanovsky
parent 51d7a53874
commit ebb6796bd3
2 changed files with 65 additions and 1 deletions
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59
drivers/infiniband/core/uverbs_std_types_counters.c
View File

@@ -80,6 +80,49 @@ err_create_counters:
return ret;
}
static int UVERBS_HANDLER(UVERBS_METHOD_COUNTERS_READ)(struct ib_device *ib_dev,
struct ib_uverbs_file *file,
struct uverbs_attr_bundle *attrs)
{
struct ib_counters_read_attr read_attr = {};
const struct uverbs_attr *uattr;
struct ib_counters *counters =
uverbs_attr_get_obj(attrs, UVERBS_ATTR_READ_COUNTERS_HANDLE);
int ret;
if (!ib_dev->read_counters)
return -EOPNOTSUPP;
if (!atomic_read(&counters->usecnt))
return -EINVAL;
ret = uverbs_copy_from(&read_attr.flags, attrs,
UVERBS_ATTR_READ_COUNTERS_FLAGS);
if (ret)
return ret;
uattr = uverbs_attr_get(attrs, UVERBS_ATTR_READ_COUNTERS_BUFF);
read_attr.ncounters = uattr->ptr_attr.len / sizeof(u64);
read_attr.counters_buff = kcalloc(read_attr.ncounters,
sizeof(u64), GFP_KERNEL);
if (!read_attr.counters_buff)
return -ENOMEM;
ret = ib_dev->read_counters(counters,
&read_attr,
attrs);
if (ret)
goto err_read;
ret = uverbs_copy_to(attrs, UVERBS_ATTR_READ_COUNTERS_BUFF,
read_attr.counters_buff,
read_attr.ncounters * sizeof(u64));
err_read:
kfree(read_attr.counters_buff);
return ret;
}
static DECLARE_UVERBS_NAMED_METHOD(UVERBS_METHOD_COUNTERS_CREATE,
&UVERBS_ATTR_IDR(UVERBS_ATTR_CREATE_COUNTERS_HANDLE,
UVERBS_OBJECT_COUNTERS,
@@ -93,8 +136,22 @@ static DECLARE_UVERBS_NAMED_METHOD_WITH_HANDLER(UVERBS_METHOD_COUNTERS_DESTROY,
UVERBS_ACCESS_DESTROY,
UA_FLAGS(UVERBS_ATTR_SPEC_F_MANDATORY)));
#define MAX_COUNTERS_BUFF_SIZE USHRT_MAX
static DECLARE_UVERBS_NAMED_METHOD(UVERBS_METHOD_COUNTERS_READ,
&UVERBS_ATTR_IDR(UVERBS_ATTR_READ_COUNTERS_HANDLE,
UVERBS_OBJECT_COUNTERS,
UVERBS_ACCESS_READ,
UA_FLAGS(UVERBS_ATTR_SPEC_F_MANDATORY)),
&UVERBS_ATTR_PTR_OUT(UVERBS_ATTR_READ_COUNTERS_BUFF,
UVERBS_ATTR_SIZE(0, MAX_COUNTERS_BUFF_SIZE),
UA_FLAGS(UVERBS_ATTR_SPEC_F_MANDATORY)),
&UVERBS_ATTR_PTR_IN(UVERBS_ATTR_READ_COUNTERS_FLAGS,
UVERBS_ATTR_TYPE(__u32),
UA_FLAGS(UVERBS_ATTR_SPEC_F_MANDATORY)));
DECLARE_UVERBS_NAMED_OBJECT(UVERBS_OBJECT_COUNTERS,
&UVERBS_TYPE_ALLOC_IDR(0, uverbs_free_counters),
&UVERBS_METHOD(UVERBS_METHOD_COUNTERS_CREATE),
&UVERBS_METHOD(UVERBS_METHOD_COUNTERS_DESTROY));
&UVERBS_METHOD(UVERBS_METHOD_COUNTERS_DESTROY),
&UVERBS_METHOD(UVERBS_METHOD_COUNTERS_READ));