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svcrdma: Define maximum number of backchannel requests

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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>
This commit is contained in:
Chuck Lever 2016-01-07 14:50:02 -05:00 • committed by Doug Ledford
commit 03fe993153
3 changed files with 28 additions and 15 deletions
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13
include/linux/sunrpc/svc_rdma.h
View file

@ -51,6 +51,7 @@
/* RPC/RDMA parameters and stats */
extern unsigned int svcrdma_ord;
extern unsigned int svcrdma_max_requests;
extern unsigned int svcrdma_max_bc_requests;
extern unsigned int svcrdma_max_req_size;
extern atomic_t rdma_stat_recv;
@ -134,10 +135,11 @@ struct svcxprt_rdma {
int sc_max_sge;
int sc_max_sge_rd; /* max sge for read target */
int sc_sq_depth; /* Depth of SQ */
atomic_t sc_sq_count; /* Number of SQ WR on queue */
int sc_max_requests; /* Depth of RQ */
unsigned int sc_sq_depth; /* Depth of SQ */
unsigned int sc_rq_depth; /* Depth of RQ */
u32 sc_max_requests; /* Forward credits */
u32 sc_max_bc_requests;/* Backward credits */
int sc_max_req_size; /* Size of each RQ WR buf */
struct ib_pd *sc_pd;
@ -186,6 +188,11 @@ struct svcxprt_rdma {
#define RPCRDMA_MAX_REQUESTS 32
#define RPCRDMA_MAX_REQ_SIZE 4096
/* Typical ULP usage of BC requests is NFSv4.1 backchannel. Our
* current NFSv4.1 implementation supports one backchannel slot.
*/
#define RPCRDMA_MAX_BC_REQUESTS 2
#define RPCSVC_MAXPAYLOAD_RDMA RPCSVC_MAXPAYLOAD
/* svc_rdma_marshal.c */