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xprtrdma: Basic support for Remote Invalidation

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Have frwr's ro_unmap_sync recognize an invalidated rkey that appears
as part of a Receive completion. Local invalidation can be skipped
for that rkey.

Use an out-of-band signaling mechanism to indicate to the server
that the client is prepared to receive RDMA Send With Invalidate.

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
2016-09-15 10:57:16 -04:00
committed by Anna Schumaker
parent 87cfb9a0c8
commit c8b920bb49
6 changed files with 44 additions and 7 deletions
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18
net/sunrpc/xprtrdma/rpc_rdma.c
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@@ -231,7 +231,8 @@ rpcrdma_convert_kvec(struct kvec *vec, struct rpcrdma_mr_seg *seg, int n)
static int
rpcrdma_convert_iovs(struct xdr_buf *xdrbuf, unsigned int pos,
enum rpcrdma_chunktype type, struct rpcrdma_mr_seg *seg)
enum rpcrdma_chunktype type, struct rpcrdma_mr_seg *seg,
bool reminv_expected)
{
int len, n, p, page_base;
struct page **ppages;
@@ -273,6 +274,13 @@ rpcrdma_convert_iovs(struct xdr_buf *xdrbuf, unsigned int pos,
if (type == rpcrdma_readch)
return n;
/* When encoding the Write list, some servers need to see an extra
* segment for odd-length Write chunks. The upper layer provides
* space in the tail iovec for this purpose.
*/
if (type == rpcrdma_writech && reminv_expected)
return n;
if (xdrbuf->tail[0].iov_len) {
/* the rpcrdma protocol allows us to omit any trailing
* xdr pad bytes, saving the server an RDMA operation. */
@@ -329,7 +337,7 @@ rpcrdma_encode_read_list(struct rpcrdma_xprt *r_xprt,
if (rtype == rpcrdma_areadch)
pos = 0;
seg = req->rl_segments;
nsegs = rpcrdma_convert_iovs(&rqst->rq_snd_buf, pos, rtype, seg);
nsegs = rpcrdma_convert_iovs(&rqst->rq_snd_buf, pos, rtype, seg, false);
if (nsegs < 0)
return ERR_PTR(nsegs);
@@ -393,7 +401,8 @@ rpcrdma_encode_write_list(struct rpcrdma_xprt *r_xprt, struct rpcrdma_req *req,
seg = req->rl_segments;
nsegs = rpcrdma_convert_iovs(&rqst->rq_rcv_buf,
rqst->rq_rcv_buf.head[0].iov_len,
wtype, seg);
wtype, seg,
r_xprt->rx_ia.ri_reminv_expected);
if (nsegs < 0)
return ERR_PTR(nsegs);
@@ -458,7 +467,8 @@ rpcrdma_encode_reply_chunk(struct rpcrdma_xprt *r_xprt,
}
seg = req->rl_segments;
nsegs = rpcrdma_convert_iovs(&rqst->rq_rcv_buf, 0, wtype, seg);
nsegs = rpcrdma_convert_iovs(&rqst->rq_rcv_buf, 0, wtype, seg,
r_xprt->rx_ia.ri_reminv_expected);
if (nsegs < 0)
return ERR_PTR(nsegs);