[PATCH 5.10 289/406] ntb: Clean up tx tail index on link down

Greg Kroah-Hartman
2023-09-17T19:37:00Z

From: Dave Jiang <dave.jiang@intel.com>

commit cc79bd2738c2d40aba58b2be6ce47dc0e471df0e upstream.

The tx tail index is not reset when the link goes down. This causes the
tail index to go out of sync when the link goes down and comes back up.
Refactor the ntb_qp_link_down_reset() and reset the tail index as well.

Fixes: 2849b5d70641 ("NTB: Reset transport QP link stats on down")
Reported-by: Yuan Y Lu <yuan.y.lu@intel.com>
Tested-by: Yuan Y Lu <yuan.y.lu@intel.com>
Reviewed-by: Logan Gunthorpe <logang@deltatee.com>
Signed-off-by: Dave Jiang <dave.jiang@intel.com>
Signed-off-by: Jon Mason <jdmason@kudzu.us>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/ntb/ntb_transport.c | 11 +++++++++--
1 file changed, 9 insertions(+), 2 deletions(-)

--- a/drivers/ntb/ntb_transport.c
+++ b/drivers/ntb/ntb_transport.c
@@ -911,7 +911,7 @@ static int ntb_set_mw(struct ntb_transpo
return 0;
}

-static void ntb_qp_link_down_reset(struct ntb_transport_qp *qp)
+static void ntb_qp_link_context_reset(struct ntb_transport_qp *qp)
{
qp->link_is_up = false;
qp->active = false;
@@ -934,6 +934,13 @@ static void ntb_qp_link_down_reset(struc
qp->tx_async = 0;
}

+static void ntb_qp_link_down_reset(struct ntb_transport_qp *qp)
+{
+ ntb_qp_link_context_reset(qp);
+ if (qp->remote_rx_info)
+ qp->remote_rx_info->entry = qp->rx_max_entry - 1;
+}
+
static void ntb_qp_link_cleanup(struct ntb_transport_qp *qp)
{
struct ntb_transport_ctx *nt = qp->transport;
@@ -1176,7 +1183,7 @@ static int ntb_transport_init_queue(stru
qp->ndev = nt->ndev;
qp->client_ready = false;
qp->event_handler = NULL;
- ntb_qp_link_down_reset(qp);
+ ntb_qp_link_context_reset(qp);

if (mw_num < qp_count % mw_count)
num_qps_mw = qp_count / mw_count + 1;