diff options
author | Shani Michaeli <shanim@mellanox.com> | 2013-02-06 16:19:12 +0000 |
---|---|---|
committer | Roland Dreier <roland@purestorage.com> | 2013-02-21 11:51:45 -0800 |
commit | 7083e42ee2ff43a11481e0e7211ec4f9ac68cb79 (patch) | |
tree | cf2c3f16075fcb37c27bff5ae4524f778df9a482 /Documentation/usb/ohci.txt | |
parent | 836dc9e3fbbab0c30aa6e664417225f5c1fb1c39 (diff) | |
download | op-kernel-dev-7083e42ee2ff43a11481e0e7211ec4f9ac68cb79.zip op-kernel-dev-7083e42ee2ff43a11481e0e7211ec4f9ac68cb79.tar.gz |
IB/core: Add "type 2" memory windows support
This patch enhances the IB core support for Memory Windows (MWs).
MWs allow an application to have better/flexible control over remote
access to memory.
Two types of MWs are supported, with the second type having two flavors:
Type 1 - associated with PD only
Type 2A - associated with QPN only
Type 2B - associated with PD and QPN
Applications can allocate a MW once, and then repeatedly bind the MW
to different ranges in MRs that are associated to the same PD. Type 1
windows are bound through a verb, while type 2 windows are bound by
posting a work request.
The 32-bit memory key is composed of a 24-bit index and an 8-bit
key. The key is changed with each bind, thus allowing more control
over the peer's use of the memory key.
The changes introduced are the following:
* add memory window type enum and a corresponding parameter to ib_alloc_mw.
* type 2 memory window bind work request support.
* create a struct that contains the common part of the bind verb struct
ibv_mw_bind and the bind work request into a single struct.
* add the ib_inc_rkey helper function to advance the tag part of an rkey.
Consumer interface details:
* new device capability flags IB_DEVICE_MEM_WINDOW_TYPE_2A and
IB_DEVICE_MEM_WINDOW_TYPE_2B are added to indicate device support
for these features.
Devices can set either IB_DEVICE_MEM_WINDOW_TYPE_2A or
IB_DEVICE_MEM_WINDOW_TYPE_2B if it supports type 2A or type 2B
memory windows. It can set neither to indicate it doesn't support
type 2 windows at all.
* modify existing provides and consumers code to the new param of
ib_alloc_mw and the ib_mw_bind_info structure
Signed-off-by: Haggai Eran <haggaie@mellanox.com>
Signed-off-by: Shani Michaeli <shanim@mellanox.com>
Signed-off-by: Or Gerlitz <ogerlitz@mellanox.com>
Signed-off-by: Roland Dreier <roland@purestorage.com>
Diffstat (limited to 'Documentation/usb/ohci.txt')
0 files changed, 0 insertions, 0 deletions