From: Logan Gunthorpe <log...@deltatee.com>
[ Upstream commit cbd27448faff4843ac4b66cc71445a10623ff48d ]
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: e26a5843f7f5 ("NTB: Split ntb_hw_intel and ntb_transport drivers")
Signed-off-by: Logan Gunthorpe <log...@deltatee.com>
Acked-by: Allen Hubbe <allen.hu...@dell.com>
Cc: Dave Jiang <dave.ji...@intel.com>
Signed-off-by: Jon Mason <jdma...@kudzu.us>
Signed-off-by: Sasha Levin <alexander.le...@microsoft.com>
---
drivers/ntb/ntb_transport.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/drivers/ntb/ntb_transport.c b/drivers/ntb/ntb_transport.c
index f58d8e305323..18339b7e88a4 100644
--- a/drivers/ntb/ntb_transport.c
+++ b/drivers/ntb/ntb_transport.c
@@ -998,6 +998,9 @@ static int ntb_transport_init_queue(struct
ntb_transport_ctx *nt,
mw_base = nt->mw_vec[mw_num].phys_addr;
mw_size = nt->mw_vec[mw_num].phys_size;
+ if (max_mw_size && mw_size > max_mw_size)
+ mw_size = max_mw_size;
+
tx_size = (unsigned int)mw_size / num_qps_mw;
qp_offset = tx_size * (qp_num / mw_count);
--
2.15.1
