[PATCH v2 04/14] net: ionic: Provide RDMA reset support for the RDMA driver

[Abhijit Gangurde <abhijit.gangurde@amd.com>]

The Ethernet driver holds the privilege to execute the device commands.
Export the function to execute RDMA reset command for use by RDMA driver.

Reviewed-by: Shannon Nelson <shannon.nelson@amd.com>
Signed-off-by: Abhijit Gangurde <abhijit.gangurde@amd.com>
---
 .../net/ethernet/pensando/ionic/ionic_api.h   |  9 ++++++++
 .../net/ethernet/pensando/ionic/ionic_aux.c   | 22 +++++++++++++++++++
 2 files changed, 31 insertions(+)

diff --git a/drivers/net/ethernet/pensando/ionic/ionic_api.h b/drivers/net/ethernet/pensando/ionic/ionic_api.h
index d75902ca34af..e0b766d1769f 100644
--- a/drivers/net/ethernet/pensando/ionic/ionic_api.h
+++ b/drivers/net/ethernet/pensando/ionic/ionic_api.h
@@ -54,4 +54,13 @@ int ionic_adminq_post_wait(struct ionic_lif *lif, struct ionic_admin_ctx *ctx);
  */
 int ionic_error_to_errno(enum ionic_status_code code);
 
+/**
+ * ionic_request_rdma_reset - request reset or disable the device or lif
+ * @lif:        Logical interface
+ *
+ * The reset is triggered asynchronously. It will wait until reset request
+ * completes or times out.
+ */
+void ionic_request_rdma_reset(struct ionic_lif *lif);
+
 #endif /* _IONIC_API_H_ */
diff --git a/drivers/net/ethernet/pensando/ionic/ionic_aux.c b/drivers/net/ethernet/pensando/ionic/ionic_aux.c
index ba29c456de00..bbad848d2dce 100644
--- a/drivers/net/ethernet/pensando/ionic/ionic_aux.c
+++ b/drivers/net/ethernet/pensando/ionic/ionic_aux.c
@@ -93,3 +93,25 @@ void ionic_auxbus_unregister(struct ionic_lif *lif)
 out:
 	mutex_unlock(&lif->adev_lock);
 }
+
+void ionic_request_rdma_reset(struct ionic_lif *lif)
+{
+	struct ionic *ionic = lif->ionic;
+	int err;
+
+	union ionic_dev_cmd cmd = {
+		.cmd.opcode = IONIC_CMD_RDMA_RESET_LIF,
+		.cmd.lif_index = cpu_to_le16(lif->index),
+	};
+
+	mutex_lock(&ionic->dev_cmd_lock);
+
+	ionic_dev_cmd_go(&ionic->idev, &cmd);
+	err = ionic_dev_cmd_wait(ionic, DEVCMD_TIMEOUT);
+
+	mutex_unlock(&ionic->dev_cmd_lock);
+
+	if (err)
+		pr_warn("%s request_reset: error %d\n", __func__, err);
+}
+EXPORT_SYMBOL_NS(ionic_request_rdma_reset, "NET_IONIC");
-- 
2.34.1