ntb_transport: fix bug calculating num_qps_mw
A divide by zero error occurs if qp_count is less than mw_count because
num_qps_mw is calculated to be zero. The calculation appears to be
incorrect.
The requirement is for num_qps_mw to be set to qp_count / mw_count
with any remainder divided among the earlier mws.
For example, if mw_count is 5 and qp_count is 12 then mws 0 and 1
will have 3 qps per window and mws 2 through 4 will have 2 qps per window.
Thus, when mw_num < qp_count % mw_count, num_qps_mw is 1 higher
than when mw_num >= qp_count.
Signed-off-by: Logan Gunthorpe <logang@deltatee.com>
Fixes: e26a5843f7
("NTB: Split ntb_hw_intel and ntb_transport drivers")
Acked-by: Allen Hubbe <Allen.Hubbe@dell.com>
Signed-off-by: Jon Mason <jdmason@kudzu.us>
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@ -623,7 +623,7 @@ static int ntb_transport_setup_qp_mw(struct ntb_transport_ctx *nt,
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if (!mw->virt_addr)
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return -ENOMEM;
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if (qp_count % mw_count && mw_num + 1 < qp_count / mw_count)
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if (mw_num < qp_count % mw_count)
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num_qps_mw = qp_count / mw_count + 1;
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else
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num_qps_mw = qp_count / mw_count;
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@ -1000,7 +1000,7 @@ static int ntb_transport_init_queue(struct ntb_transport_ctx *nt,
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qp->event_handler = NULL;
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ntb_qp_link_down_reset(qp);
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if (qp_count % mw_count && mw_num + 1 < qp_count / mw_count)
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if (mw_num < qp_count % mw_count)
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num_qps_mw = qp_count / mw_count + 1;
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else
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num_qps_mw = qp_count / mw_count;
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