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authorChuck Lever <chuck.lever@oracle.com>2016-01-07 22:50:02 +0300
committerDoug Ledford <dledford@redhat.com>2016-01-19 23:30:48 +0300
commit03fe9931536fe4782e9e34f7f499d588acd2015b (patch)
treecfee0f65e50640e7daf02eff73e9748a2e1d8db5 /net
parentba986c96f907a513215fb7f1c0a89261c97251ca (diff)
downloadlinux-03fe9931536fe4782e9e34f7f499d588acd2015b.tar.xz
svcrdma: Define maximum number of backchannel requests
Extra resources for handling backchannel requests have to be pre-allocated when a transport instance is created. Set up additional fields in svcxprt_rdma to track these resources. The max_requests fields are elements of the RPC-over-RDMA protocol, so they should be u32. To ensure that unsigned arithmetic is used everywhere, some other fields in the svcxprt_rdma struct are updated. Signed-off-by: Chuck Lever <chuck.lever@oracle.com> Acked-by: Bruce Fields <bfields@fieldses.org> Signed-off-by: Doug Ledford <dledford@redhat.com>
Diffstat (limited to 'net')
-rw-r--r--net/sunrpc/xprtrdma/svc_rdma.c6
-rw-r--r--net/sunrpc/xprtrdma/svc_rdma_transport.c24
2 files changed, 18 insertions, 12 deletions
diff --git a/net/sunrpc/xprtrdma/svc_rdma.c b/net/sunrpc/xprtrdma/svc_rdma.c
index e894e0698c45..c846ca9f1eba 100644
--- a/net/sunrpc/xprtrdma/svc_rdma.c
+++ b/net/sunrpc/xprtrdma/svc_rdma.c
@@ -55,6 +55,7 @@ unsigned int svcrdma_ord = RPCRDMA_ORD;
static unsigned int min_ord = 1;
static unsigned int max_ord = 4096;
unsigned int svcrdma_max_requests = RPCRDMA_MAX_REQUESTS;
+unsigned int svcrdma_max_bc_requests = RPCRDMA_MAX_BC_REQUESTS;
static unsigned int min_max_requests = 4;
static unsigned int max_max_requests = 16384;
unsigned int svcrdma_max_req_size = RPCRDMA_MAX_REQ_SIZE;
@@ -245,9 +246,10 @@ int svc_rdma_init(void)
{
dprintk("SVCRDMA Module Init, register RPC RDMA transport\n");
dprintk("\tsvcrdma_ord : %d\n", svcrdma_ord);
- dprintk("\tmax_requests : %d\n", svcrdma_max_requests);
- dprintk("\tsq_depth : %d\n",
+ dprintk("\tmax_requests : %u\n", svcrdma_max_requests);
+ dprintk("\tsq_depth : %u\n",
svcrdma_max_requests * RPCRDMA_SQ_DEPTH_MULT);
+ dprintk("\tmax_bc_requests : %u\n", svcrdma_max_bc_requests);
dprintk("\tmax_inline : %d\n", svcrdma_max_req_size);
svc_rdma_wq = alloc_workqueue("svc_rdma", 0, 0);
diff --git a/net/sunrpc/xprtrdma/svc_rdma_transport.c b/net/sunrpc/xprtrdma/svc_rdma_transport.c
index 8b3ee04f5bb4..af86dfeceb4a 100644
--- a/net/sunrpc/xprtrdma/svc_rdma_transport.c
+++ b/net/sunrpc/xprtrdma/svc_rdma_transport.c
@@ -169,12 +169,12 @@ static struct svc_rdma_op_ctxt *alloc_ctxt(struct svcxprt_rdma *xprt,
static bool svc_rdma_prealloc_ctxts(struct svcxprt_rdma *xprt)
{
- int i;
+ unsigned int i;
/* Each RPC/RDMA credit can consume a number of send
* and receive WQEs. One ctxt is allocated for each.
*/
- i = xprt->sc_sq_depth + xprt->sc_max_requests;
+ i = xprt->sc_sq_depth + xprt->sc_rq_depth;
while (i--) {
struct svc_rdma_op_ctxt *ctxt;
@@ -285,7 +285,7 @@ static struct svc_rdma_req_map *alloc_req_map(gfp_t flags)
static bool svc_rdma_prealloc_maps(struct svcxprt_rdma *xprt)
{
- int i;
+ unsigned int i;
/* One for each receive buffer on this connection. */
i = xprt->sc_max_requests;
@@ -1016,8 +1016,8 @@ static struct svc_xprt *svc_rdma_accept(struct svc_xprt *xprt)
struct ib_device *dev;
int uninitialized_var(dma_mr_acc);
int need_dma_mr = 0;
+ unsigned int i;
int ret = 0;
- int i;
listen_rdma = container_of(xprt, struct svcxprt_rdma, sc_xprt);
clear_bit(XPT_CONN, &xprt->xpt_flags);
@@ -1046,9 +1046,13 @@ static struct svc_xprt *svc_rdma_accept(struct svc_xprt *xprt)
newxprt->sc_max_sge_rd = min_t(size_t, dev->attrs.max_sge_rd,
RPCSVC_MAXPAGES);
newxprt->sc_max_req_size = svcrdma_max_req_size;
- newxprt->sc_max_requests = min((size_t)dev->attrs.max_qp_wr,
- (size_t)svcrdma_max_requests);
- newxprt->sc_sq_depth = RPCRDMA_SQ_DEPTH_MULT * newxprt->sc_max_requests;
+ newxprt->sc_max_requests = min_t(u32, dev->attrs.max_qp_wr,
+ svcrdma_max_requests);
+ newxprt->sc_max_bc_requests = min_t(u32, dev->attrs.max_qp_wr,
+ svcrdma_max_bc_requests);
+ newxprt->sc_rq_depth = newxprt->sc_max_requests +
+ newxprt->sc_max_bc_requests;
+ newxprt->sc_sq_depth = RPCRDMA_SQ_DEPTH_MULT * newxprt->sc_rq_depth;
if (!svc_rdma_prealloc_ctxts(newxprt))
goto errout;
@@ -1077,7 +1081,7 @@ static struct svc_xprt *svc_rdma_accept(struct svc_xprt *xprt)
dprintk("svcrdma: error creating SQ CQ for connect request\n");
goto errout;
}
- cq_attr.cqe = newxprt->sc_max_requests;
+ cq_attr.cqe = newxprt->sc_rq_depth;
newxprt->sc_rq_cq = ib_create_cq(dev,
rq_comp_handler,
cq_event_handler,
@@ -1092,7 +1096,7 @@ static struct svc_xprt *svc_rdma_accept(struct svc_xprt *xprt)
qp_attr.event_handler = qp_event_handler;
qp_attr.qp_context = &newxprt->sc_xprt;
qp_attr.cap.max_send_wr = newxprt->sc_sq_depth;
- qp_attr.cap.max_recv_wr = newxprt->sc_max_requests;
+ qp_attr.cap.max_recv_wr = newxprt->sc_rq_depth;
qp_attr.cap.max_send_sge = newxprt->sc_max_sge;
qp_attr.cap.max_recv_sge = newxprt->sc_max_sge;
qp_attr.sq_sig_type = IB_SIGNAL_REQ_WR;
@@ -1183,7 +1187,7 @@ static struct svc_xprt *svc_rdma_accept(struct svc_xprt *xprt)
newxprt->sc_dma_lkey = dev->local_dma_lkey;
/* Post receive buffers */
- for (i = 0; i < newxprt->sc_max_requests; i++) {
+ for (i = 0; i < newxprt->sc_rq_depth; i++) {
ret = svc_rdma_post_recv(newxprt, GFP_KERNEL);
if (ret) {
dprintk("svcrdma: failure posting receive buffers\n");