net/enic: enable flow API for VF representor

[dpdk.git] / drivers / net / hns3 / hns3_ethdev_vf.c

diff --git a/drivers/net/hns3/hns3_ethdev_vf.c b/drivers/net/hns3/hns3_ethdev_vf.c
index d7f5024..037a5be 100644 (file)
--- a/drivers/net/hns3/hns3_ethdev_vf.c
+++ b/drivers/net/hns3/hns3_ethdev_vf.c
@@ -871,6 +871,25 @@ hns3vf_dev_mtu_set(struct rte_eth_dev *dev, uint16_t mtu)
                return -EIO;
        }
 
+       /*
+        * when Rx of scattered packets is off, we have some possibility of
+        * using vector Rx process function or simple Rx functions in hns3 PMD
+        * driver. If the input MTU is increased and the maximum length of
+        * received packets is greater than the length of a buffer for Rx
+        * packet, the hardware network engine needs to use multiple BDs and
+        * buffers to store these packets. This will cause problems when still
+        * using vector Rx process function or simple Rx function to receiving
+        * packets. So, when Rx of scattered packets is off and device is
+        * started, it is not permitted to increase MTU so that the maximum
+        * length of Rx packets is greater than Rx buffer length.
+        */
+       if (dev->data->dev_started && !dev->data->scattered_rx &&
+           frame_size > hw->rx_buf_len) {
+               hns3_err(hw, "failed to set mtu because current is "
+                       "not scattered rx mode");
+               return -EOPNOTSUPP;
+       }
+
        rte_spinlock_lock(&hw->lock);
        ret = hns3vf_config_mtu(hw, mtu);
        if (ret) {