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RDMA/hns: Bugfix for calculating qp buffer size 

The buffer size of qp which used to allocate qp buffer space for storing
sqwqe and rqwqe will be the length of buffer space. The kernel driver will
use the buffer address and the same size to get the user memory. The same
size named buff_size of qp. According the algorithm of calculating, The
size of the two is not equal when users set the max sge of sq.

Fixes: b28ca7ccef ("RDMA/hns: Limit extend sq sge num")
Signed-off-by: Lijun Ou <oulijun@huawei.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
This commit is contained in:
Lijun Ou 2019-06-24 19:47:49 +08:00 committed by Jason Gunthorpe
parent 726be12f5c
commit e0222d18d6
1 changed files with 2 additions and 2 deletions
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4
drivers/infiniband/hw/hns/hns_roce_qp.c
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@ -387,8 +387,8 @@ static int hns_roce_set_user_sq_size(struct hns_roce_dev *hr_dev,
hr_qp->sq.wqe_shift), PAGE_SIZE);
} else {
page_size = 1 << (hr_dev->caps.mtt_buf_pg_sz + PAGE_SHIFT);
hr_qp->sge.sge_cnt =
max(page_size / (1 << hr_qp->sge.sge_shift), ex_sge_num);
hr_qp->sge.sge_cnt = ex_sge_num ?
max(page_size / (1 << hr_qp->sge.sge_shift), ex_sge_num) : 0;
hr_qp->buff_size = HNS_ROCE_ALOGN_UP((hr_qp->rq.wqe_cnt <<
hr_qp->rq.wqe_shift), page_size) +
HNS_ROCE_ALOGN_UP((hr_qp->sge.sge_cnt <<