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svcrdma: Use new CQ API for RPC-over-RDMA server receive CQs

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Calling ib_poll_cq() to sort through WCs during a completion is a
common pattern amongst RDMA consumers. Since commit 14d3a3b249
("IB: add a proper completion queue abstraction"), WC sorting can
be handled by the IB core.

By converting to this new API, svcrdma is made a better neighbor to
other RDMA consumers, as it allows the core to schedule the delivery
of completions more fairly amongst all active consumers.

Because each ib_cqe carries a pointer to a completion method, the
core can now post operations on a consumer's QP, and handle the
completions itself.

svcrdma receive completions no longer use the dto_tasklet. Each
polled Receive WC is now handled individually in soft IRQ context.

The server transport's rdma_stat_rq_poll and rdma_stat_rq_prod
metrics are no longer updated.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
This commit is contained in:
Chuck Lever
2016-03-01 13:07:13 -05:00
committed by J. Bruce Fields
parent ec705fd4d0
commit 8bd5ba86d9
2 changed files with 40 additions and 91 deletions
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2
include/linux/sunrpc/svc_rdma.h
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@@ -75,6 +75,7 @@ struct svc_rdma_op_ctxt {
struct svc_rdma_fastreg_mr *frmr;
int hdr_count;
struct xdr_buf arg;
struct ib_cqe cqe;
struct list_head dto_q;
enum ib_wr_opcode wr_op;
enum ib_wc_status wc_status;
@@ -174,7 +175,6 @@ struct svcxprt_rdma {
struct work_struct sc_work;
};
/* sc_flags */
#define RDMAXPRT_RQ_PENDING 1
#define RDMAXPRT_SQ_PENDING 2
#define RDMAXPRT_CONN_PENDING 3