From: Logan Gunthorpe logang@deltatee.com
[ Upstream commit b54369a248c2e033bfcf5d6917e08cf9d73d54a6 ]
Legacy drivers do not have port numbers (but is reliably only two ports) and was broken by the recent commit that added mult-port support to ntb_perf. This is especially important to support the cross link topology which is perfectly symmetric and cannot assign unique port numbers easily.
Hardware that returns zero for both the local port and the peer should just always use gidx=0 for the only peer.
Fixes: 5648e56d03fa ("NTB: ntb_perf: Add full multi-port NTB API support") Signed-off-by: Logan Gunthorpe logang@deltatee.com Acked-by: Allen Hubbe allenbh@gmail.com Tested-by: Alexander Fomichev fomichev.ru@gmail.com Signed-off-by: Jon Mason jdmason@kudzu.us Signed-off-by: Sasha Levin sashal@kernel.org Signed-off-by: Yang Yingliang yangyingliang@huawei.com --- drivers/ntb/test/ntb_perf.c | 10 ++++++++++ 1 file changed, 10 insertions(+)
diff --git a/drivers/ntb/test/ntb_perf.c b/drivers/ntb/test/ntb_perf.c index 28d288ff3bae..62a9a1d44f9f 100644 --- a/drivers/ntb/test/ntb_perf.c +++ b/drivers/ntb/test/ntb_perf.c @@ -1418,6 +1418,16 @@ static int perf_init_peers(struct perf_ctx *perf) if (perf->gidx == -1) perf->gidx = pidx;
+ /* + * Hardware with only two ports may not have unique port + * numbers. In this case, the gidxs should all be zero. + */ + if (perf->pcnt == 1 && ntb_port_number(perf->ntb) == 0 && + ntb_peer_port_number(perf->ntb, 0) == 0) { + perf->gidx = 0; + perf->peers[0].gidx = 0; + } + for (pidx = 0; pidx < perf->pcnt; pidx++) { ret = perf_setup_peer_mw(&perf->peers[pidx]); if (ret)