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ntb_transport: Fix bug with max_mw_size parameter
[ Upstream commitcbd27448fa
] When using the max_mw_size parameter of ntb_transport to limit the size of the Memory windows, communication cannot be established and the queues freeze. This is because the mw_size that's reported to the peer is correctly limited but the size used locally is not. So the MW is initialized with a buffer smaller than the window but the TX side is using the full window. This means the TX side will be writing to a region of the window that points nowhere. This is easily fixed by applying the same limit to tx_size in ntb_transport_init_queue(). Fixes:e26a5843f7
("NTB: Split ntb_hw_intel and ntb_transport drivers") Signed-off-by: Logan Gunthorpe <logang@deltatee.com> Acked-by: Allen Hubbe <Allen.Hubbe@dell.com> Cc: Dave Jiang <dave.jiang@intel.com> Signed-off-by: Jon Mason <jdmason@kudzu.us> Signed-off-by: Sasha Levin <alexander.levin@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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@ -996,6 +996,9 @@ static int ntb_transport_init_queue(struct ntb_transport_ctx *nt,
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mw_base = nt->mw_vec[mw_num].phys_addr;
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mw_size = nt->mw_vec[mw_num].phys_size;
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if (max_mw_size && mw_size > max_mw_size)
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mw_size = max_mw_size;
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tx_size = (unsigned int)mw_size / num_qps_mw;
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qp_offset = tx_size * (qp_num / mw_count);
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