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RDMA/hns: Fix 0-length sge calculation error

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One RC SQ WQE can store 2 sges but UD can't, so ignore 2 valid sges of
wr.sglist for RC which have been filled in WQE before setting extended
sge.  Either of RC and UD can not contain 0-length sges, so these 0-length
sges should be skipped.

Fixes: 54d6638765 ("RDMA/hns: Optimize WQE buffer size calculating process")
Link: https://lore.kernel.org/r/1606558959-48510-2-git-send-email-liweihang@huawei.com
Signed-off-by: Lang Cheng <chenglang@huawei.com>
Signed-off-by: Weihang Li <liweihang@huawei.com>
Reviewed-by: Leon Romanovsky <leonro@nvidia.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
This commit is contained in:
Lang Cheng 2020-11-28 18:22:37 +08:00 committed by Jason Gunthorpe
parent 1d11d26cf0
commit 0fd0175e30
1 changed files with 10 additions and 14 deletions
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24
drivers/infiniband/hw/hns/hns_roce_hw_v2.c
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@ -214,25 +214,20 @@ static int fill_ext_sge_inl_data(struct hns_roce_qp *qp,
return 0;
}
static void set_extend_sge(struct hns_roce_qp *qp, const struct ib_send_wr *wr,
unsigned int *sge_ind, unsigned int valid_num_sge)
static void set_extend_sge(struct hns_roce_qp *qp, struct ib_sge *sge,
unsigned int *sge_ind, unsigned int cnt)
{
struct hns_roce_v2_wqe_data_seg *dseg;
unsigned int cnt = valid_num_sge;
struct ib_sge *sge = wr->sg_list;
unsigned int idx = *sge_ind;
if (qp->ibqp.qp_type == IB_QPT_RC || qp->ibqp.qp_type == IB_QPT_UC) {
cnt -= HNS_ROCE_SGE_IN_WQE;
sge += HNS_ROCE_SGE_IN_WQE;
}
while (cnt > 0) {
dseg = hns_roce_get_extend_sge(qp, idx & (qp->sge.sge_cnt - 1));
set_data_seg_v2(dseg, sge);
idx++;
if (likely(sge->length)) {
set_data_seg_v2(dseg, sge);
idx++;
cnt--;
}
sge++;
cnt--;
}
*sge_ind = idx;
@ -340,7 +335,8 @@ static int set_rwqe_data_seg(struct ib_qp *ibqp, const struct ib_send_wr *wr,
}
}
set_extend_sge(qp, wr, sge_ind, valid_num_sge);
set_extend_sge(qp, wr->sg_list + i, sge_ind,
valid_num_sge - HNS_ROCE_SGE_IN_WQE);
}
roce_set_field(rc_sq_wqe->byte_16,
@ -503,7 +499,7 @@ static inline int set_ud_wqe(struct hns_roce_qp *qp,
if (ret)
return ret;
set_extend_sge(qp, wr, &curr_idx, valid_num_sge);
set_extend_sge(qp, wr->sg_list, &curr_idx, valid_num_sge);
/*
* The pipeline can sequentially post all valid WQEs into WQ buffer,