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-rw-r--r--drivers/ntb/ntb_transport.c18
1 files changed, 17 insertions, 1 deletions
diff --git a/drivers/ntb/ntb_transport.c b/drivers/ntb/ntb_transport.c
index 1c6386d5f79c..0d851d684523 100644
--- a/drivers/ntb/ntb_transport.c
+++ b/drivers/ntb/ntb_transport.c
@@ -494,6 +494,12 @@ static ssize_t debugfs_read(struct file *filp, char __user *ubuf, size_t count,
"tx_index - \t%u\n", qp->tx_index);
out_offset += snprintf(buf + out_offset, out_count - out_offset,
"tx_max_entry - \t%u\n", qp->tx_max_entry);
+ out_offset += snprintf(buf + out_offset, out_count - out_offset,
+ "qp->remote_rx_info->entry - \t%u\n",
+ qp->remote_rx_info->entry);
+ out_offset += snprintf(buf + out_offset, out_count - out_offset,
+ "free tx - \t%u\n",
+ ntb_transport_tx_free_entry(qp));
out_offset += snprintf(buf + out_offset, out_count - out_offset,
"\nQP Link %s\n",
@@ -535,6 +541,7 @@ static struct ntb_queue_entry *ntb_list_rm(spinlock_t *lock,
}
entry = list_first_entry(list, struct ntb_queue_entry, entry);
list_del(&entry->entry);
+
out:
spin_unlock_irqrestore(lock, flags);
@@ -1843,7 +1850,7 @@ int ntb_transport_tx_enqueue(struct ntb_transport_qp *qp, void *cb, void *data,
entry = ntb_list_rm(&qp->ntb_tx_free_q_lock, &qp->tx_free_q);
if (!entry) {
qp->tx_err_no_buf++;
- return -ENOMEM;
+ return -EBUSY;
}
entry->cb_data = cb;
@@ -1969,6 +1976,15 @@ unsigned int ntb_transport_max_size(struct ntb_transport_qp *qp)
}
EXPORT_SYMBOL_GPL(ntb_transport_max_size);
+unsigned int ntb_transport_tx_free_entry(struct ntb_transport_qp *qp)
+{
+ unsigned int head = qp->tx_index;
+ unsigned int tail = qp->remote_rx_info->entry;
+
+ return tail > head ? tail - head : qp->tx_max_entry + tail - head;
+}
+EXPORT_SYMBOL_GPL(ntb_transport_tx_free_entry);
+
static void ntb_transport_doorbell_callback(void *data, int vector)
{
struct ntb_transport_ctx *nt = data;
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