mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-25 13:43:55 +08:00
d1ed857e57
Untangle the end of rpcrdma_ia_open() by moving DMA MR set-up, which is different for each registration method, to the .ro_open functions. This is refactoring only. No behavior change is expected. Signed-off-by: Chuck Lever <chuck.lever@oracle.com> Tested-by: Devesh Sharma <devesh.sharma@avagotech.com> Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
108 lines
2.6 KiB
C
108 lines
2.6 KiB
C
/*
|
|
* Copyright (c) 2015 Oracle. All rights reserved.
|
|
* Copyright (c) 2003-2007 Network Appliance, Inc. All rights reserved.
|
|
*/
|
|
|
|
/* No-op chunk preparation. All client memory is pre-registered.
|
|
* Sometimes referred to as ALLPHYSICAL mode.
|
|
*
|
|
* Physical registration is simple because all client memory is
|
|
* pre-registered and never deregistered. This mode is good for
|
|
* adapter bring up, but is considered not safe: the server is
|
|
* trusted not to abuse its access to client memory not involved
|
|
* in RDMA I/O.
|
|
*/
|
|
|
|
#include "xprt_rdma.h"
|
|
|
|
#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
|
|
# define RPCDBG_FACILITY RPCDBG_TRANS
|
|
#endif
|
|
|
|
static int
|
|
physical_op_open(struct rpcrdma_ia *ia, struct rpcrdma_ep *ep,
|
|
struct rpcrdma_create_data_internal *cdata)
|
|
{
|
|
struct ib_device_attr *devattr = &ia->ri_devattr;
|
|
struct ib_mr *mr;
|
|
|
|
/* Obtain an rkey to use for RPC data payloads.
|
|
*/
|
|
mr = ib_get_dma_mr(ia->ri_pd,
|
|
IB_ACCESS_LOCAL_WRITE |
|
|
IB_ACCESS_REMOTE_WRITE |
|
|
IB_ACCESS_REMOTE_READ);
|
|
if (IS_ERR(mr)) {
|
|
pr_err("%s: ib_get_dma_mr for failed with %lX\n",
|
|
__func__, PTR_ERR(mr));
|
|
return -ENOMEM;
|
|
}
|
|
ia->ri_dma_mr = mr;
|
|
|
|
/* Obtain an lkey to use for regbufs.
|
|
*/
|
|
if (devattr->device_cap_flags & IB_DEVICE_LOCAL_DMA_LKEY)
|
|
ia->ri_dma_lkey = ia->ri_device->local_dma_lkey;
|
|
else
|
|
ia->ri_dma_lkey = ia->ri_dma_mr->lkey;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* PHYSICAL memory registration conveys one page per chunk segment.
|
|
*/
|
|
static size_t
|
|
physical_op_maxpages(struct rpcrdma_xprt *r_xprt)
|
|
{
|
|
return min_t(unsigned int, RPCRDMA_MAX_DATA_SEGS,
|
|
rpcrdma_max_segments(r_xprt));
|
|
}
|
|
|
|
static int
|
|
physical_op_init(struct rpcrdma_xprt *r_xprt)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
/* The client's physical memory is already exposed for
|
|
* remote access via RDMA READ or RDMA WRITE.
|
|
*/
|
|
static int
|
|
physical_op_map(struct rpcrdma_xprt *r_xprt, struct rpcrdma_mr_seg *seg,
|
|
int nsegs, bool writing)
|
|
{
|
|
struct rpcrdma_ia *ia = &r_xprt->rx_ia;
|
|
|
|
rpcrdma_map_one(ia->ri_device, seg, rpcrdma_data_dir(writing));
|
|
seg->mr_rkey = ia->ri_dma_mr->rkey;
|
|
seg->mr_base = seg->mr_dma;
|
|
seg->mr_nsegs = 1;
|
|
return 1;
|
|
}
|
|
|
|
/* Unmap a memory region, but leave it registered.
|
|
*/
|
|
static int
|
|
physical_op_unmap(struct rpcrdma_xprt *r_xprt, struct rpcrdma_mr_seg *seg)
|
|
{
|
|
struct rpcrdma_ia *ia = &r_xprt->rx_ia;
|
|
|
|
rpcrdma_unmap_one(ia->ri_device, seg);
|
|
return 1;
|
|
}
|
|
|
|
static void
|
|
physical_op_destroy(struct rpcrdma_buffer *buf)
|
|
{
|
|
}
|
|
|
|
const struct rpcrdma_memreg_ops rpcrdma_physical_memreg_ops = {
|
|
.ro_map = physical_op_map,
|
|
.ro_unmap = physical_op_unmap,
|
|
.ro_open = physical_op_open,
|
|
.ro_maxpages = physical_op_maxpages,
|
|
.ro_init = physical_op_init,
|
|
.ro_destroy = physical_op_destroy,
|
|
.ro_displayname = "physical",
|
|
};
|