[PATCH 2/8] xprtrdma: Remove BOUNCEBUFFERS memory registration mode

Chuck Lever
2014-04-14T22:22:41Z

Clean up: This memory registration mode is slow and was never
meant for use in production environments. Remove it to reduce
implementation complexity.

Signed-off-by: Chuck Lever <chuck.lever-QHcLZuEGTsvQT0dZR+AlfA@public.gmane.org>
---

net/sunrpc/xprtrdma/rpc_rdma.c | 8 --------
net/sunrpc/xprtrdma/transport.c | 13 -------------
net/sunrpc/xprtrdma/verbs.c | 5 +----
3 files changed, 1 insertions(+), 25 deletions(-)

diff --git a/net/sunrpc/xprtrdma/rpc_rdma.c b/net/sunrpc/xprtrdma/rpc_rdma.c
index c296468..b963e50 100644
--- a/net/sunrpc/xprtrdma/rpc_rdma.c
+++ b/net/sunrpc/xprtrdma/rpc_rdma.c
@@ -439,14 +439,6 @@ rpcrdma_marshal_req(struct rpc_rqst *rqst)
wtype = rpcrdma_noch;
BUG_ON(rtype != rpcrdma_noch && wtype != rpcrdma_noch);

- if (r_xprt->rx_ia.ri_memreg_strategy == RPCRDMA_BOUNCEBUFFERS &&
- (rtype != rpcrdma_noch || wtype != rpcrdma_noch)) {
- /* forced to "pure inline"? */
- dprintk("RPC: %s: too much data (%d/%d) for inline\n",
- __func__, rqst->rq_rcv_buf.len, rqst->rq_snd_buf.len);
- return -1;
- }
-
hdrlen = 28; /*sizeof *headerp;*/
padlen = 0;

diff --git a/net/sunrpc/xprtrdma/transport.c b/net/sunrpc/xprtrdma/transport.c
index 1eb9c46..8c5035a 100644
--- a/net/sunrpc/xprtrdma/transport.c
+++ b/net/sunrpc/xprtrdma/transport.c
@@ -503,18 +503,6 @@ xprt_rdma_allocate(struct rpc_task *task, size_t size)
* If the allocation or registration fails, the RPC framework
* will (doggedly) retry.
*/
- if (rpcx_to_rdmax(xprt)->rx_ia.ri_memreg_strategy ==
- RPCRDMA_BOUNCEBUFFERS) {
- /* forced to "pure inline" */
- dprintk("RPC: %s: too much data (%zd) for inline "
- "(r/w max %d/%d)\n", __func__, size,
- rpcx_to_rdmad(xprt).inline_rsize,
- rpcx_to_rdmad(xprt).inline_wsize);
- size = req->rl_size;
- rpc_exit(task, -EIO); /* fail the operation */
- rpcx_to_rdmax(xprt)->rx_stats.failed_marshal_count++;
- goto out;
- }
if (task->tk_flags & RPC_TASK_SWAPPER)
nreq = kmalloc(sizeof *req + size, GFP_ATOMIC);
else
@@ -543,7 +531,6 @@ xprt_rdma_allocate(struct rpc_task *task, size_t size)
req = nreq;
}
dprintk("RPC: %s: size %zd, request 0x%p\n", __func__, size, req);
-out:
req->rl_connect_cookie = 0; /* our reserved value */
return req->rl_xdr_buf;

diff --git a/net/sunrpc/xprtrdma/verbs.c b/net/sunrpc/xprtrdma/verbs.c
index 422cf89..1fe554f 100644
--- a/net/sunrpc/xprtrdma/verbs.c
+++ b/net/sunrpc/xprtrdma/verbs.c
@@ -557,7 +557,6 @@ rpcrdma_ia_open(struct rpcrdma_xprt *xprt, struct sockaddr *addr, int memreg)
* adapter.
*/
switch (memreg) {
- case RPCRDMA_BOUNCEBUFFERS:
case RPCRDMA_REGISTER:
case RPCRDMA_FRMR:
break;
@@ -778,9 +777,7 @@ rpcrdma_ep_create(struct rpcrdma_ep *ep, struct rpcrdma_ia *ia,

/* Client offers RDMA Read but does not initiate */
ep->rep_remote_cma.initiator_depth = 0;
- if (ia->ri_memreg_strategy == RPCRDMA_BOUNCEBUFFERS)
- ep->rep_remote_cma.responder_resources = 0;
- else if (devattr.max_qp_rd_atom > 32) /* arbitrary but <= 255 */
+ if (devattr.max_qp_rd_atom > 32) /* arbitrary but <= 255 */
ep->rep_remote_cma.responder_resources = 32;
else
ep->rep_remote_cma.responder_resources = devattr.max_qp_rd_atom;

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