svcrdma: Add a service to register a Fast Reg MR with the device
Fast Reg MR introduces a new WR type. Add a service to register the
region with the adapter and update the completion handling to support
completions with a NULL WR context.
Signed-off-by: Tom Tucker <tom@opengridcomputing.com>
diff --git a/net/sunrpc/xprtrdma/svc_rdma_transport.c b/net/sunrpc/xprtrdma/svc_rdma_transport.c
index a8ec4b1..c3e8db0 100644
--- a/net/sunrpc/xprtrdma/svc_rdma_transport.c
+++ b/net/sunrpc/xprtrdma/svc_rdma_transport.c
@@ -326,6 +326,45 @@
}
/*
+ * Processs a completion context
+ */
+static void process_context(struct svcxprt_rdma *xprt,
+ struct svc_rdma_op_ctxt *ctxt)
+{
+ svc_rdma_unmap_dma(ctxt);
+
+ switch (ctxt->wr_op) {
+ case IB_WR_SEND:
+ svc_rdma_put_context(ctxt, 1);
+ break;
+
+ case IB_WR_RDMA_WRITE:
+ svc_rdma_put_context(ctxt, 0);
+ break;
+
+ case IB_WR_RDMA_READ:
+ if (test_bit(RDMACTXT_F_LAST_CTXT, &ctxt->flags)) {
+ struct svc_rdma_op_ctxt *read_hdr = ctxt->read_hdr;
+ BUG_ON(!read_hdr);
+ spin_lock_bh(&xprt->sc_rq_dto_lock);
+ set_bit(XPT_DATA, &xprt->sc_xprt.xpt_flags);
+ list_add_tail(&read_hdr->dto_q,
+ &xprt->sc_read_complete_q);
+ spin_unlock_bh(&xprt->sc_rq_dto_lock);
+ svc_xprt_enqueue(&xprt->sc_xprt);
+ }
+ svc_rdma_put_context(ctxt, 0);
+ break;
+
+ default:
+ printk(KERN_ERR "svcrdma: unexpected completion type, "
+ "opcode=%d\n",
+ ctxt->wr_op);
+ break;
+ }
+}
+
+/*
* Send Queue Completion Handler - potentially called on interrupt context.
*
* Note that caller must hold a transport reference.
@@ -337,17 +376,12 @@
struct ib_cq *cq = xprt->sc_sq_cq;
int ret;
-
if (!test_and_clear_bit(RDMAXPRT_SQ_PENDING, &xprt->sc_flags))
return;
ib_req_notify_cq(xprt->sc_sq_cq, IB_CQ_NEXT_COMP);
atomic_inc(&rdma_stat_sq_poll);
while ((ret = ib_poll_cq(cq, 1, &wc)) > 0) {
- ctxt = (struct svc_rdma_op_ctxt *)(unsigned long)wc.wr_id;
- xprt = ctxt->xprt;
-
- svc_rdma_unmap_dma(ctxt);
if (wc.status != IB_WC_SUCCESS)
/* Close the transport */
set_bit(XPT_CLOSE, &xprt->sc_xprt.xpt_flags);
@@ -356,35 +390,10 @@
atomic_dec(&xprt->sc_sq_count);
wake_up(&xprt->sc_send_wait);
- switch (ctxt->wr_op) {
- case IB_WR_SEND:
- svc_rdma_put_context(ctxt, 1);
- break;
+ ctxt = (struct svc_rdma_op_ctxt *)(unsigned long)wc.wr_id;
+ if (ctxt)
+ process_context(xprt, ctxt);
- case IB_WR_RDMA_WRITE:
- svc_rdma_put_context(ctxt, 0);
- break;
-
- case IB_WR_RDMA_READ:
- if (test_bit(RDMACTXT_F_LAST_CTXT, &ctxt->flags)) {
- struct svc_rdma_op_ctxt *read_hdr = ctxt->read_hdr;
- BUG_ON(!read_hdr);
- spin_lock_bh(&xprt->sc_rq_dto_lock);
- set_bit(XPT_DATA, &xprt->sc_xprt.xpt_flags);
- list_add_tail(&read_hdr->dto_q,
- &xprt->sc_read_complete_q);
- spin_unlock_bh(&xprt->sc_rq_dto_lock);
- svc_xprt_enqueue(&xprt->sc_xprt);
- }
- svc_rdma_put_context(ctxt, 0);
- break;
-
- default:
- printk(KERN_ERR "svcrdma: unexpected completion type, "
- "opcode=%d, status=%d\n",
- wc.opcode, wc.status);
- break;
- }
svc_xprt_put(&xprt->sc_xprt);
}
@@ -1184,6 +1193,40 @@
return 1;
}
+/*
+ * Attempt to register the kvec representing the RPC memory with the
+ * device.
+ *
+ * Returns:
+ * NULL : The device does not support fastreg or there were no more
+ * fastreg mr.
+ * frmr : The kvec register request was successfully posted.
+ * <0 : An error was encountered attempting to register the kvec.
+ */
+int svc_rdma_fastreg(struct svcxprt_rdma *xprt,
+ struct svc_rdma_fastreg_mr *frmr)
+{
+ struct ib_send_wr fastreg_wr;
+ u8 key;
+
+ /* Bump the key */
+ key = (u8)(frmr->mr->lkey & 0x000000FF);
+ ib_update_fast_reg_key(frmr->mr, ++key);
+
+ /* Prepare FASTREG WR */
+ memset(&fastreg_wr, 0, sizeof fastreg_wr);
+ fastreg_wr.opcode = IB_WR_FAST_REG_MR;
+ fastreg_wr.send_flags = IB_SEND_SIGNALED;
+ fastreg_wr.wr.fast_reg.iova_start = (unsigned long)frmr->kva;
+ fastreg_wr.wr.fast_reg.page_list = frmr->page_list;
+ fastreg_wr.wr.fast_reg.page_list_len = frmr->page_list_len;
+ fastreg_wr.wr.fast_reg.page_shift = PAGE_SHIFT;
+ fastreg_wr.wr.fast_reg.length = frmr->map_len;
+ fastreg_wr.wr.fast_reg.access_flags = frmr->access_flags;
+ fastreg_wr.wr.fast_reg.rkey = frmr->mr->lkey;
+ return svc_rdma_send(xprt, &fastreg_wr);
+}
+
int svc_rdma_send(struct svcxprt_rdma *xprt, struct ib_send_wr *wr)
{
struct ib_send_wr *bad_wr;
@@ -1193,8 +1236,6 @@
return -ENOTCONN;
BUG_ON(wr->send_flags != IB_SEND_SIGNALED);
- BUG_ON(((struct svc_rdma_op_ctxt *)(unsigned long)wr->wr_id)->wr_op !=
- wr->opcode);
/* If the SQ is full, wait until an SQ entry is available */
while (1) {
spin_lock_bh(&xprt->sc_lock);