[PATCH v3 03/18] NTB: Read peer info from local SPAD in transport

From: Allen Hubbe
Date: Tue Jun 09 2015 - 10:45:45 EST


From: Dave Jiang <dave.jiang@xxxxxxxxx>

Importance: High

The transport was writing and then reading the peer spad, essentially
reading what it just wrote instead of exchanging any information with
the peer. The transport expects the peer values to be the same as the
local values, so this issue was not obvious.

Signed-off-by: Dave Jiang <dave.jiang@xxxxxxxxx>
---
drivers/ntb/ntb_transport.c | 10 +++++-----
1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/drivers/ntb/ntb_transport.c b/drivers/ntb/ntb_transport.c
index 9faf1c6029af..d9538e911df6 100644
--- a/drivers/ntb/ntb_transport.c
+++ b/drivers/ntb/ntb_transport.c
@@ -761,17 +761,17 @@ static void ntb_transport_link_work(struct work_struct *work)
ntb_peer_spad_write(ndev, VERSION, NTB_TRANSPORT_VERSION);

/* Query the remote side for its info */
- val = ntb_peer_spad_read(ndev, VERSION);
+ val = ntb_spad_read(ndev, VERSION);
dev_dbg(&pdev->dev, "Remote version = %d\n", val);
if (val != NTB_TRANSPORT_VERSION)
goto out;

- val = ntb_peer_spad_read(ndev, NUM_QPS);
+ val = ntb_spad_read(ndev, NUM_QPS);
dev_dbg(&pdev->dev, "Remote max number of qps = %d\n", val);
if (val != nt->qp_count)
goto out;

- val = ntb_peer_spad_read(ndev, NUM_MWS);
+ val = ntb_spad_read(ndev, NUM_MWS);
dev_dbg(&pdev->dev, "Remote number of mws = %d\n", val);
if (val != nt->mw_count)
goto out;
@@ -779,10 +779,10 @@ static void ntb_transport_link_work(struct work_struct *work)
for (i = 0; i < nt->mw_count; i++) {
u64 val64;

- val = ntb_peer_spad_read(ndev, MW0_SZ_HIGH + (i * 2));
+ val = ntb_spad_read(ndev, MW0_SZ_HIGH + (i * 2));
val64 = (u64)val << 32;

- val = ntb_peer_spad_read(ndev, MW0_SZ_LOW + (i * 2));
+ val = ntb_spad_read(ndev, MW0_SZ_LOW + (i * 2));
val64 |= val;

dev_dbg(&pdev->dev, "Remote MW%d size = %#llx\n", i, val64);
--
2.4.0.rc0.43.gcf8a8c6

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/