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authorShani Michaeli <shanim@mellanox.com>2013-02-06 16:19:12 +0000
committerRoland Dreier <roland@purestorage.com>2013-02-21 11:51:45 -0800
commit7083e42ee2ff43a11481e0e7211ec4f9ac68cb79 (patch)
treecf2c3f16075fcb37c27bff5ae4524f778df9a482 /net/sunrpc
parent836dc9e3fbbab0c30aa6e664417225f5c1fb1c39 (diff)
downloadlinux-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 'net/sunrpc')
-rw-r--r--net/sunrpc/xprtrdma/verbs.c20
1 files changed, 10 insertions, 10 deletions
diff --git a/net/sunrpc/xprtrdma/verbs.c b/net/sunrpc/xprtrdma/verbs.c
index 745973b729a..93726560eaa 100644
--- a/net/sunrpc/xprtrdma/verbs.c
+++ b/net/sunrpc/xprtrdma/verbs.c
@@ -1086,7 +1086,7 @@ rpcrdma_buffer_create(struct rpcrdma_buffer *buf, struct rpcrdma_ep *ep,
case RPCRDMA_MEMWINDOWS:
/* Allocate one extra request's worth, for full cycling */
for (i = (buf->rb_max_requests+1) * RPCRDMA_MAX_SEGS; i; i--) {
- r->r.mw = ib_alloc_mw(ia->ri_pd);
+ r->r.mw = ib_alloc_mw(ia->ri_pd, IB_MW_TYPE_1);
if (IS_ERR(r->r.mw)) {
rc = PTR_ERR(r->r.mw);
dprintk("RPC: %s: ib_alloc_mw"
@@ -1673,12 +1673,12 @@ rpcrdma_register_memwin_external(struct rpcrdma_mr_seg *seg,
*nsegs = 1;
rpcrdma_map_one(ia, seg, writing);
- param.mr = ia->ri_bind_mem;
+ param.bind_info.mr = ia->ri_bind_mem;
param.wr_id = 0ULL; /* no send cookie */
- param.addr = seg->mr_dma;
- param.length = seg->mr_len;
+ param.bind_info.addr = seg->mr_dma;
+ param.bind_info.length = seg->mr_len;
param.send_flags = 0;
- param.mw_access_flags = mem_priv;
+ param.bind_info.mw_access_flags = mem_priv;
DECR_CQCOUNT(&r_xprt->rx_ep);
rc = ib_bind_mw(ia->ri_id->qp, seg->mr_chunk.rl_mw->r.mw, &param);
@@ -1690,7 +1690,7 @@ rpcrdma_register_memwin_external(struct rpcrdma_mr_seg *seg,
rpcrdma_unmap_one(ia, seg);
} else {
seg->mr_rkey = seg->mr_chunk.rl_mw->r.mw->rkey;
- seg->mr_base = param.addr;
+ seg->mr_base = param.bind_info.addr;
seg->mr_nsegs = 1;
}
return rc;
@@ -1706,10 +1706,10 @@ rpcrdma_deregister_memwin_external(struct rpcrdma_mr_seg *seg,
int rc;
BUG_ON(seg->mr_nsegs != 1);
- param.mr = ia->ri_bind_mem;
- param.addr = 0ULL; /* unbind */
- param.length = 0;
- param.mw_access_flags = 0;
+ param.bind_info.mr = ia->ri_bind_mem;
+ param.bind_info.addr = 0ULL; /* unbind */
+ param.bind_info.length = 0;
+ param.bind_info.mw_access_flags = 0;
if (*r) {
param.wr_id = (u64) (unsigned long) *r;
param.send_flags = IB_SEND_SIGNALED;