NTB: Out of free receive entries issue
If the NTB client driver enqueues the maximum number of rx buffers, it
will not be able to re-enqueue another in its callback handler due to a
lack of free entries. This can be avoided by adding the current entry
to the free queue prior to calling the client callback handler. With
this change, ntb_netdev will no longer encounter a rx error on its first
packet.
Signed-off-by: Jon Mason <jon.mason@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/drivers/ntb/ntb_transport.c b/drivers/ntb/ntb_transport.c
index 69c58da..b3afb24 100644
--- a/drivers/ntb/ntb_transport.c
+++ b/drivers/ntb/ntb_transport.c
@@ -910,12 +910,15 @@
static void ntb_rx_copy_task(struct ntb_transport_qp *qp,
struct ntb_queue_entry *entry, void *offset)
{
+ void *cb_data = entry->cb_data;
+ unsigned int len = entry->len;
+
memcpy(entry->buf, offset, entry->len);
- if (qp->rx_handler && qp->client_ready == NTB_LINK_UP)
- qp->rx_handler(qp, qp->cb_data, entry->cb_data, entry->len);
-
ntb_list_add(&qp->ntb_rx_free_q_lock, &entry->entry, &qp->rx_free_q);
+
+ if (qp->rx_handler && qp->client_ready == NTB_LINK_UP)
+ qp->rx_handler(qp, qp->cb_data, cb_data, len);
}
static int ntb_process_rxc(struct ntb_transport_qp *qp)
