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xprtrdma: Remove usage of "mw"

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Clean up: struct rpcrdma_mw was named after Memory Windows, but
xprtrdma no longer supports a Memory Window registration mode.
Rename rpcrdma_mw and its fields to reduce confusion and make
the code more sensible to read.

Renaming "mw" was suggested by Tom Talpey, the author of the
original xprtrdma implementation. It's a good idea, but I haven't
done this until now because it's a huge diffstat for no benefit
other than code readability.

However, I'm about to introduce static trace points that expose
a few of xprtrdma's internal data structures. They should make sense
in the trace report, and it's reasonable to treat trace points as a
kernel API contract which might be difficult to change later.

While I'm churning things up, two additional changes:
- rename variables unhelpfully called "r" to "mr", to improve code
  clarity, and
- rename the MR-related helper functions using the form
  "rpcrdma_mr_<verb>", to be consistent with other areas of the
  code.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
This commit is contained in:
Chuck Lever
2017-12-14 20:57:55 -05:00
committed by Anna Schumaker
parent ce5b371782
commit 96ceddea37
5 changed files with 292 additions and 278 deletions
Download Patch File Download Diff File Expand all files Collapse all files

64
net/sunrpc/xprtrdma/rpc_rdma.c
View File

@@ -292,15 +292,15 @@ encode_item_not_present(struct xdr_stream *xdr)
}
static void
xdr_encode_rdma_segment(__be32 *iptr, struct rpcrdma_mw *mw)
xdr_encode_rdma_segment(__be32 *iptr, struct rpcrdma_mr *mr)
{
*iptr++ = cpu_to_be32(mw->mw_handle);
*iptr++ = cpu_to_be32(mw->mw_length);
xdr_encode_hyper(iptr, mw->mw_offset);
*iptr++ = cpu_to_be32(mr->mr_handle);
*iptr++ = cpu_to_be32(mr->mr_length);
xdr_encode_hyper(iptr, mr->mr_offset);
}
static int
encode_rdma_segment(struct xdr_stream *xdr, struct rpcrdma_mw *mw)
encode_rdma_segment(struct xdr_stream *xdr, struct rpcrdma_mr *mr)
{
__be32 *p;
@@ -308,12 +308,12 @@ encode_rdma_segment(struct xdr_stream *xdr, struct rpcrdma_mw *mw)
if (unlikely(!p))
return -EMSGSIZE;
xdr_encode_rdma_segment(p, mw);
xdr_encode_rdma_segment(p, mr);
return 0;
}
static int
encode_read_segment(struct xdr_stream *xdr, struct rpcrdma_mw *mw,
encode_read_segment(struct xdr_stream *xdr, struct rpcrdma_mr *mr,
u32 position)
{
__be32 *p;
@@ -324,7 +324,7 @@ encode_read_segment(struct xdr_stream *xdr, struct rpcrdma_mw *mw,
*p++ = xdr_one; /* Item present */
*p++ = cpu_to_be32(position);
xdr_encode_rdma_segment(p, mw);
xdr_encode_rdma_segment(p, mr);
return 0;
}
@@ -348,7 +348,7 @@ rpcrdma_encode_read_list(struct rpcrdma_xprt *r_xprt, struct rpcrdma_req *req,
{
struct xdr_stream *xdr = &req->rl_stream;
struct rpcrdma_mr_seg *seg;
struct rpcrdma_mw *mw;
struct rpcrdma_mr *mr;
unsigned int pos;
int nsegs;
@@ -363,21 +363,21 @@ rpcrdma_encode_read_list(struct rpcrdma_xprt *r_xprt, struct rpcrdma_req *req,
do {
seg = r_xprt->rx_ia.ri_ops->ro_map(r_xprt, seg, nsegs,
false, &mw);
false, &mr);
if (IS_ERR(seg))
return PTR_ERR(seg);
rpcrdma_push_mw(mw, &req->rl_registered);
rpcrdma_mr_push(mr, &req->rl_registered);
if (encode_read_segment(xdr, mw, pos) < 0)
if (encode_read_segment(xdr, mr, pos) < 0)
return -EMSGSIZE;
dprintk("RPC: %5u %s: pos %u %u@0x%016llx:0x%08x (%s)\n",
rqst->rq_task->tk_pid, __func__, pos,
mw->mw_length, (unsigned long long)mw->mw_offset,
mw->mw_handle, mw->mw_nents < nsegs ? "more" : "last");
mr->mr_length, (unsigned long long)mr->mr_offset,
mr->mr_handle, mr->mr_nents < nsegs ? "more" : "last");
r_xprt->rx_stats.read_chunk_count++;
nsegs -= mw->mw_nents;
nsegs -= mr->mr_nents;
} while (nsegs);
return 0;
@@ -404,7 +404,7 @@ rpcrdma_encode_write_list(struct rpcrdma_xprt *r_xprt, struct rpcrdma_req *req,
{
struct xdr_stream *xdr = &req->rl_stream;
struct rpcrdma_mr_seg *seg;
struct rpcrdma_mw *mw;
struct rpcrdma_mr *mr;
int nsegs, nchunks;
__be32 *segcount;
@@ -425,23 +425,23 @@ rpcrdma_encode_write_list(struct rpcrdma_xprt *r_xprt, struct rpcrdma_req *req,
nchunks = 0;
do {
seg = r_xprt->rx_ia.ri_ops->ro_map(r_xprt, seg, nsegs,
true, &mw);
true, &mr);
if (IS_ERR(seg))
return PTR_ERR(seg);
rpcrdma_push_mw(mw, &req->rl_registered);
rpcrdma_mr_push(mr, &req->rl_registered);
if (encode_rdma_segment(xdr, mw) < 0)
if (encode_rdma_segment(xdr, mr) < 0)
return -EMSGSIZE;
dprintk("RPC: %5u %s: %u@0x016%llx:0x%08x (%s)\n",
rqst->rq_task->tk_pid, __func__,
mw->mw_length, (unsigned long long)mw->mw_offset,
mw->mw_handle, mw->mw_nents < nsegs ? "more" : "last");
mr->mr_length, (unsigned long long)mr->mr_offset,
mr->mr_handle, mr->mr_nents < nsegs ? "more" : "last");
r_xprt->rx_stats.write_chunk_count++;
r_xprt->rx_stats.total_rdma_request += seg->mr_len;
nchunks++;
nsegs -= mw->mw_nents;
nsegs -= mr->mr_nents;
} while (nsegs);
/* Update count of segments in this Write chunk */
@@ -468,7 +468,7 @@ rpcrdma_encode_reply_chunk(struct rpcrdma_xprt *r_xprt, struct rpcrdma_req *req,
{
struct xdr_stream *xdr = &req->rl_stream;
struct rpcrdma_mr_seg *seg;
struct rpcrdma_mw *mw;
struct rpcrdma_mr *mr;
int nsegs, nchunks;
__be32 *segcount;
@@ -487,23 +487,23 @@ rpcrdma_encode_reply_chunk(struct rpcrdma_xprt *r_xprt, struct rpcrdma_req *req,
nchunks = 0;
do {
seg = r_xprt->rx_ia.ri_ops->ro_map(r_xprt, seg, nsegs,
true, &mw);
true, &mr);
if (IS_ERR(seg))
return PTR_ERR(seg);
rpcrdma_push_mw(mw, &req->rl_registered);
rpcrdma_mr_push(mr, &req->rl_registered);
if (encode_rdma_segment(xdr, mw) < 0)
if (encode_rdma_segment(xdr, mr) < 0)
return -EMSGSIZE;
dprintk("RPC: %5u %s: %u@0x%016llx:0x%08x (%s)\n",
rqst->rq_task->tk_pid, __func__,
mw->mw_length, (unsigned long long)mw->mw_offset,
mw->mw_handle, mw->mw_nents < nsegs ? "more" : "last");
mr->mr_length, (unsigned long long)mr->mr_offset,
mr->mr_handle, mr->mr_nents < nsegs ? "more" : "last");
r_xprt->rx_stats.reply_chunk_count++;
r_xprt->rx_stats.total_rdma_request += seg->mr_len;
nchunks++;
nsegs -= mw->mw_nents;
nsegs -= mr->mr_nents;
} while (nsegs);
/* Update count of segments in the Reply chunk */
@@ -821,10 +821,10 @@ rpcrdma_marshal_req(struct rpcrdma_xprt *r_xprt, struct rpc_rqst *rqst)
* so these registrations are invalid and unusable.
*/
while (unlikely(!list_empty(&req->rl_registered))) {
struct rpcrdma_mw *mw;
struct rpcrdma_mr *mr;
mw = rpcrdma_pop_mw(&req->rl_registered);
rpcrdma_defer_mr_recovery(mw);
mr = rpcrdma_mr_pop(&req->rl_registered);
rpcrdma_mr_defer_recovery(mr);
}
/* This implementation supports the following combinations