[rdma-core,v2,2/2] vmw_pvrdma: Use resource ids from physical device if available

Commit Message

Adit Ranadive Sept. 23, 2019, 11:49 p.m. UTC

From: Bryan Tan <[e-mail]>

This is the accompanying userspace change to allow applications
use physical resource ids if provided by the driver/device.

The create QP command is modified to specify a flag that tells
the driver to send back the physical HCA's QPN and the hypervisor-
generated QP handle separately.

Reviewed-by: Jorgen Hansen <[e-mail]>
Signed-off-by: Adit Ranadive <[e-mail]>
Signed-off-by: Bryan Tan <[e-mail]>
---
 providers/vmw_pvrdma/pvrdma-abi.h |  2 +-
 providers/vmw_pvrdma/pvrdma.h     |  1 +
 providers/vmw_pvrdma/qp.c         | 24 +++++++++++++-----------
 3 files changed, 15 insertions(+), 12 deletions(-)

Patch

diff --git a/providers/vmw_pvrdma/pvrdma-abi.h b/providers/vmw_pvrdma/pvrdma-abi.h
index 77db9ddd1bb7..1a4c3c8a98f2 100644
--- a/providers/vmw_pvrdma/pvrdma-abi.h
+++ b/providers/vmw_pvrdma/pvrdma-abi.h
@@ -55,7 +55,7 @@  DECLARE_DRV_CMD(user_pvrdma_alloc_pd, IB_USER_VERBS_CMD_ALLOC_PD,
 DECLARE_DRV_CMD(user_pvrdma_create_cq, IB_USER_VERBS_CMD_CREATE_CQ,
 		pvrdma_create_cq, pvrdma_create_cq_resp);
 DECLARE_DRV_CMD(user_pvrdma_create_qp, IB_USER_VERBS_CMD_CREATE_QP,
-		pvrdma_create_qp, empty);
+		pvrdma_create_qp, pvrdma_create_qp_resp);
 DECLARE_DRV_CMD(user_pvrdma_create_srq, IB_USER_VERBS_CMD_CREATE_SRQ,
 		pvrdma_create_srq, pvrdma_create_srq_resp);
 DECLARE_DRV_CMD(user_pvrdma_alloc_ucontext, IB_USER_VERBS_CMD_GET_CONTEXT,
diff --git a/providers/vmw_pvrdma/pvrdma.h b/providers/vmw_pvrdma/pvrdma.h
index d90bd8096664..bb4a2db08d14 100644
--- a/providers/vmw_pvrdma/pvrdma.h
+++ b/providers/vmw_pvrdma/pvrdma.h
@@ -170,6 +170,7 @@  struct pvrdma_qp {
 	struct pvrdma_wq		sq;
 	struct pvrdma_wq		rq;
 	int				is_srq;
+	uint32_t			qp_handle;
 };
 
 struct pvrdma_ah {
diff --git a/providers/vmw_pvrdma/qp.c b/providers/vmw_pvrdma/qp.c
index ef429db93a43..966480f5abaa 100644
--- a/providers/vmw_pvrdma/qp.c
+++ b/providers/vmw_pvrdma/qp.c
@@ -211,9 +211,8 @@  struct ibv_qp *pvrdma_create_qp(struct ibv_pd *pd,
 {
 	struct pvrdma_device *dev = to_vdev(pd->context->device);
 	struct user_pvrdma_create_qp cmd;
-	struct ib_uverbs_create_qp_resp resp;
+	struct user_pvrdma_create_qp_resp resp = {};
 	struct pvrdma_qp *qp;
-	int ret;
 	int is_srq = !!(attr->srq);
 
 	attr->cap.max_send_sge = max_t(uint32_t, 1U, attr->cap.max_send_sge);
@@ -281,15 +280,18 @@  struct ibv_qp *pvrdma_create_qp(struct ibv_pd *pd,
 	cmd.rbuf_addr = (uintptr_t)qp->rbuf.buf;
 	cmd.rbuf_size = qp->rbuf.length;
 	cmd.qp_addr = (uintptr_t) qp;
+	cmd.flags = PVRDMA_USER_QP_CREATE_USE_RESP;
 
-	ret = ibv_cmd_create_qp(pd, &qp->ibv_qp, attr,
-				&cmd.ibv_cmd, sizeof(cmd),
-				&resp, sizeof(resp));
-
-	if (ret)
+	if (ibv_cmd_create_qp(pd, &qp->ibv_qp, attr, &cmd.ibv_cmd, sizeof(cmd),
+			      &resp.ibv_resp, sizeof(resp)))
 		goto err_free;
 
-	to_vctx(pd->context)->qp_tbl[qp->ibv_qp.qp_num & 0xFFFF] = qp;
+	if (resp.drv_payload.qpn_valid == PVRDMA_USER_QP_CREATE_USE_RESP)
+		qp->qp_handle = resp.drv_payload.qp_handle;
+	else
+		qp->qp_handle = qp->ibv_qp.qp_num;
+
+	to_vctx(pd->context)->qp_tbl[qp->qp_handle & 0xFFFF] = qp;
 
 	/* If set, each WR submitted to the SQ generate a completion entry */
 	if (attr->sq_sig_all)
@@ -414,7 +416,7 @@  int pvrdma_destroy_qp(struct ibv_qp *ibqp)
 	free(qp->rq.wrid);
 	pvrdma_free_buf(&qp->rbuf);
 	pvrdma_free_buf(&qp->sbuf);
-	ctx->qp_tbl[ibqp->qp_num & 0xFFFF] = NULL;
+	ctx->qp_tbl[qp->qp_handle & 0xFFFF] = NULL;
 	free(qp);
 
 	return 0;
@@ -547,7 +549,7 @@  out:
 	if (nreq) {
 		udma_to_device_barrier();
 		pvrdma_write_uar_qp(ctx->uar,
-				    PVRDMA_UAR_QP_SEND | ibqp->qp_num);
+				    PVRDMA_UAR_QP_SEND | qp->qp_handle);
 	}
 
 	pthread_spin_unlock(&qp->sq.lock);
@@ -630,7 +632,7 @@  int pvrdma_post_recv(struct ibv_qp *ibqp, struct ibv_recv_wr *wr,
 out:
 	if (nreq)
 		pvrdma_write_uar_qp(ctx->uar,
-				    PVRDMA_UAR_QP_RECV | ibqp->qp_num);
+				    PVRDMA_UAR_QP_RECV | qp->qp_handle);
 
 	pthread_spin_unlock(&qp->rq.lock);
 	return ret;