RDMA/hns: Fix incorrect sge nums calculation

The user usually configures the number of sge through the max_send_sge
parameter when creating qp, and configures the maximum size of inline data
that can be sent through max_inline_data. Inline uses sge to fill data to
send. Expect the following:

1) When the sge space cannot hold inline data, the sge space needs to be
   expanded to accommodate all inline data

2) When the sge space is enough to accommodate inline data, the upper
   limit of inline data can be increased so that users can send larger
   inline data

Currently case one is not implemented. When the inline data is larger than
the sge space, an error of insufficient sge space occurs.  This part of
the code needs to be reimplemented according to the expected rules. The
calculation method of sge num is modified to take the maximum value of
max_send_sge and the sge for max_inline_data to solve this problem.

Fixes: 05201e01be93 ("RDMA/hns: Refactor process of setting extended sge")
Fixes: 30b707886aeb ("RDMA/hns: Support inline data in extented sge space for RC")
Link: https://lore.kernel.org/r/20221108133847.2304539-3-xuhaoyue1@hisilicon.com
Signed-off-by: Luoyouming <luoyouming@huawei.com>
Signed-off-by: Haoyue Xu <xuhaoyue1@hisilicon.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>

1 files changed, 1 insertions, 11 deletions

diff --git a/drivers/infiniband/hw/hns/hns_roce_hw_v2.c b/drivers/infiniband/hw/hns/hns_roce_hw_v2.c
index dcb59c05edfd..939811867249 100644
--- a/drivers/infiniband/hw/hns/hns_roce_hw_v2.c
+++ b/drivers/infiniband/hw/hns/hns_roce_hw_v2.c
@@ -188,14 +188,6 @@ static void set_atomic_seg(const struct ib_send_wr *wr,
 	hr_reg_write(rc_sq_wqe, RC_SEND_WQE_SGE_NUM, valid_num_sge);
 }
 
-static unsigned int get_std_sge_num(struct hns_roce_qp *qp)
-{
-	if (qp->ibqp.qp_type == IB_QPT_GSI || qp->ibqp.qp_type == IB_QPT_UD)
-		return 0;
-
-	return HNS_ROCE_SGE_IN_WQE;
-}
-
 static int fill_ext_sge_inl_data(struct hns_roce_qp *qp,
 				 const struct ib_send_wr *wr,
 				 unsigned int *sge_idx, u32 msg_len)
@@ -203,14 +195,12 @@ static int fill_ext_sge_inl_data(struct hns_roce_qp *qp,
 	struct ib_device *ibdev = &(to_hr_dev(qp->ibqp.device))->ib_dev;
 	unsigned int left_len_in_pg;
 	unsigned int idx = *sge_idx;
-	unsigned int std_sge_num;
 	unsigned int i = 0;
 	unsigned int len;
 	void *addr;
 	void *dseg;
 
-	std_sge_num = get_std_sge_num(qp);
-	if (msg_len > (qp->sq.max_gs - std_sge_num) * HNS_ROCE_SGE_SIZE) {
+	if (msg_len > qp->sq.ext_sge_cnt * HNS_ROCE_SGE_SIZE) {
 		ibdev_err(ibdev,
 			  "no enough extended sge space for inline data.\n");
 		return -EINVAL;