IB/{rdmavt, hfi1}: Implement creation of accelerated UD QPs

Adds capability to create a qpn to be recognized as an accelerated
UD QP for ipoib.

This is accomplished by reserving 0x81 in byte[0] of the qpn as the
prefix for these qp types and reserving qpns between 0x810000 and
0x81ffff.

The hfi1 capability mask already contained a flag for the VNIC netdev.
This has been renamed and extended to include both VNIC and ipoib.

The rvt code to allocate qps now recognizes this flag and sets 0x81
into byte[0] of the qpn.

The code to allocate qpns is modified to reset the qpn numbering when it
is detected that a value is located in byte[0] for a UD QP and it is a
qpn being requested for net dev use. If it is a regular UD QP then it is
allowable to have bits set in byte[0] of the qpn and provide the
previously normal behavior.

The code to free the qpn now checks for the AIP prefix value of 0x81 and
removes it from the qpn before being freed so that the lower 16 bit
number can be reused.

This patch requires minor changes in the IB core and ipoib to facilitate
the creation of accelerated UP QPs.

Link: https://lore.kernel.org/r/20200511160607.173205.11757.stgit@awfm-01.aw.intel.com
Reviewed-by: Dennis Dalessandro <dennis.dalessandro@intel.com>
Reviewed-by: Mike Marciniszyn <mike.marciniszyn@intel.com>
Signed-off-by: Gary Leshner <Gary.S.Leshner@intel.com>
Signed-off-by: Kaike Wan <kaike.wan@intel.com>
Signed-off-by: Dennis Dalessandro <dennis.dalessandro@intel.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>

1 files changed, 19 insertions, 5 deletions

diff --git a/drivers/infiniband/sw/rdmavt/qp.c b/drivers/infiniband/sw/rdmavt/qp.c
index 0e1b291d2cec..91ad6c571080 100644
--- a/drivers/infiniband/sw/rdmavt/qp.c
+++ b/drivers/infiniband/sw/rdmavt/qp.c
@@ -1,5 +1,5 @@
 /*
- * Copyright(c) 2016 - 2019 Intel Corporation.
+ * Copyright(c) 2016 - 2020 Intel Corporation.
  *
  * This file is provided under a dual BSD/GPLv2 license.  When using or
  * redistributing this file, you may do so under either license.
@@ -525,15 +525,18 @@ static inline unsigned mk_qpn(struct rvt_qpn_table *qpt,
  * @rdi: rvt device info structure
  * @qpt: queue pair number table pointer
  * @port_num: IB port number, 1 based, comes from core
+ * @exclude_prefix: prefix of special queue pair number being allocated
  *
  * Return: The queue pair number
  */
 static int alloc_qpn(struct rvt_dev_info *rdi, struct rvt_qpn_table *qpt,
-		     enum ib_qp_type type, u8 port_num)
+		     enum ib_qp_type type, u8 port_num, u8 exclude_prefix)
 {
 	u32 i, offset, max_scan, qpn;
 	struct rvt_qpn_map *map;
 	u32 ret;
+	u32 max_qpn = exclude_prefix == RVT_AIP_QP_PREFIX ?
+		RVT_AIP_QPN_MAX : RVT_QPN_MAX;
 
 	if (rdi->driver_f.alloc_qpn)
 		return rdi->driver_f.alloc_qpn(rdi, qpt, type, port_num);
@@ -553,7 +556,7 @@ static int alloc_qpn(struct rvt_dev_info *rdi, struct rvt_qpn_table *qpt,
 	}
 
 	qpn = qpt->last + qpt->incr;
-	if (qpn >= RVT_QPN_MAX)
+	if (qpn >= max_qpn)
 		qpn = qpt->incr | ((qpt->last & 1) ^ 1);
 	/* offset carries bit 0 */
 	offset = qpn & RVT_BITS_PER_PAGE_MASK;
@@ -987,6 +990,9 @@ static void rvt_free_qpn(struct rvt_qpn_table *qpt, u32 qpn)
 {
 	struct rvt_qpn_map *map;
 
+	if ((qpn & RVT_AIP_QP_PREFIX_MASK) == RVT_AIP_QP_BASE)
+		qpn &= RVT_AIP_QP_SUFFIX;
+
 	map = qpt->map + (qpn & RVT_QPN_MASK) / RVT_BITS_PER_PAGE;
 	if (map->page)
 		clear_bit(qpn & RVT_BITS_PER_PAGE_MASK, map->page);
@@ -1074,13 +1080,15 @@ struct ib_qp *rvt_create_qp(struct ib_pd *ibpd,
 	struct rvt_dev_info *rdi = ib_to_rvt(ibpd->device);
 	void *priv = NULL;
 	size_t sqsize;
+	u8 exclude_prefix = 0;
 
 	if (!rdi)
 		return ERR_PTR(-EINVAL);
 
 	if (init_attr->cap.max_send_sge > rdi->dparms.props.max_send_sge ||
 	    init_attr->cap.max_send_wr > rdi->dparms.props.max_qp_wr ||
-	    init_attr->create_flags)
+	    (init_attr->create_flags &&
+	     init_attr->create_flags != IB_QP_CREATE_NETDEV_USE))
 		return ERR_PTR(-EINVAL);
 
 	/* Check receive queue parameters if no SRQ is specified. */
@@ -1199,14 +1207,20 @@ struct ib_qp *rvt_create_qp(struct ib_pd *ibpd,
 			goto bail_driver_priv;
 		}
 
+		if (init_attr->create_flags & IB_QP_CREATE_NETDEV_USE)
+			exclude_prefix = RVT_AIP_QP_PREFIX;
+
 		err = alloc_qpn(rdi, &rdi->qp_dev->qpn_table,
 				init_attr->qp_type,
-				init_attr->port_num);
+				init_attr->port_num,
+				exclude_prefix);
 		if (err < 0) {
 			ret = ERR_PTR(err);
 			goto bail_rq_wq;
 		}
 		qp->ibqp.qp_num = err;
+		if (init_attr->create_flags & IB_QP_CREATE_NETDEV_USE)
+			qp->ibqp.qp_num |= RVT_AIP_QP_BASE;
 		qp->port_num = init_attr->port_num;
 		rvt_init_qp(rdi, qp, init_attr->qp_type);
 		if (rdi->driver_f.qp_priv_init) {