net/txgbe: support VF MTU update

Add MTU set operation for VF device.

Signed-off-by: Jiawen Wu <jiawenwu@trustnetic.com>

diff --git a/doc/guides/nics/features/txgbe_vf.ini b/doc/guides/nics/features/txgbe_vf.ini
index ba1812e..69304ba 100644 (file)
--- a/doc/guides/nics/features/txgbe_vf.ini
+++ b/doc/guides/nics/features/txgbe_vf.ini
@@ -8,6 +8,7 @@ Link status          = Y
 Unicast MAC filter   = Y
 Multicast MAC filter = Y
 Rx interrupt         = Y
+MTU update           = Y
 Jumbo frame          = Y
 Scattered Rx         = Y
 LRO                  = Y

diff --git a/drivers/net/txgbe/txgbe_ethdev_vf.c b/drivers/net/txgbe/txgbe_ethdev_vf.c
index b9d55de..aa1b467 100644 (file)
--- a/drivers/net/txgbe/txgbe_ethdev_vf.c
+++ b/drivers/net/txgbe/txgbe_ethdev_vf.c
@@ -910,6 +910,41 @@ txgbevf_set_default_mac_addr(struct rte_eth_dev *dev,
        return 0;
 }
 
+static int
+txgbevf_dev_set_mtu(struct rte_eth_dev *dev, uint16_t mtu)
+{
+       struct txgbe_hw *hw;
+       uint32_t max_frame = mtu + RTE_ETHER_HDR_LEN + RTE_ETHER_CRC_LEN;
+       struct rte_eth_rxmode *rx_conf = &dev->data->dev_conf.rxmode;
+
+       hw = TXGBE_DEV_HW(dev);
+
+       if (mtu < RTE_ETHER_MIN_MTU ||
+                       max_frame > RTE_ETHER_MAX_JUMBO_FRAME_LEN)
+               return -EINVAL;
+
+       /* refuse mtu that requires the support of scattered packets when this
+        * feature has not been enabled before.
+        */
+       if (!(rx_conf->offloads & DEV_RX_OFFLOAD_SCATTER) &&
+           (max_frame + 2 * TXGBE_VLAN_TAG_SIZE >
+            dev->data->min_rx_buf_size - RTE_PKTMBUF_HEADROOM))
+               return -EINVAL;
+
+       /*
+        * When supported by the underlying PF driver, use the TXGBE_VF_SET_MTU
+        * request of the version 2.0 of the mailbox API.
+        * For now, use the TXGBE_VF_SET_LPE request of the version 1.0
+        * of the mailbox API.
+        */
+       if (txgbevf_rlpml_set_vf(hw, max_frame))
+               return -EINVAL;
+
+       /* update max frame size */
+       dev->data->dev_conf.rxmode.max_rx_pkt_len = max_frame;
+       return 0;
+}
+
 static int
 txgbevf_dev_promiscuous_enable(struct rte_eth_dev *dev)
 {
@@ -1073,6 +1108,7 @@ static const struct eth_dev_ops txgbevf_eth_dev_ops = {
        .allmulticast_enable  = txgbevf_dev_allmulticast_enable,
        .allmulticast_disable = txgbevf_dev_allmulticast_disable,
        .dev_infos_get        = txgbevf_dev_info_get,
+       .mtu_set              = txgbevf_dev_set_mtu,
        .vlan_filter_set      = txgbevf_vlan_filter_set,
        .vlan_strip_queue_set = txgbevf_vlan_strip_queue_set,
        .vlan_offload_set     = txgbevf_vlan_offload_set,