cxgbe: allow to change mtu

Add a mtu_set() eth_dev_ops to allow DPDK apps to modify device mtu.

Signed-off-by: Rahul Lakkireddy <rahul.lakkireddy@chelsio.com>
Signed-off-by: Kumar Sanghvi <kumaras@chelsio.com>

diff --git a/drivers/net/cxgbe/cxgbe_ethdev.c b/drivers/net/cxgbe/cxgbe_ethdev.c
index 6d7b29c..a8e057b 100644 (file)
--- a/drivers/net/cxgbe/cxgbe_ethdev.c
+++ b/drivers/net/cxgbe/cxgbe_ethdev.c
@@ -225,6 +225,34 @@ static int cxgbe_dev_link_update(struct rte_eth_dev *eth_dev,
        return 0;
 }
 
+static int cxgbe_dev_mtu_set(struct rte_eth_dev *eth_dev, uint16_t mtu)
+{
+       struct port_info *pi = (struct port_info *)(eth_dev->data->dev_private);
+       struct adapter *adapter = pi->adapter;
+       struct rte_eth_dev_info dev_info;
+       int err;
+       uint16_t new_mtu = mtu + ETHER_HDR_LEN + ETHER_CRC_LEN;
+
+       cxgbe_dev_info_get(eth_dev, &dev_info);
+
+       /* Must accommodate at least ETHER_MIN_MTU */
+       if ((new_mtu < ETHER_MIN_MTU) || (new_mtu > dev_info.max_rx_pktlen))
+               return -EINVAL;
+
+       /* set to jumbo mode if needed */
+       if (new_mtu > ETHER_MAX_LEN)
+               eth_dev->data->dev_conf.rxmode.jumbo_frame = 1;
+       else
+               eth_dev->data->dev_conf.rxmode.jumbo_frame = 0;
+
+       err = t4_set_rxmode(adapter, adapter->mbox, pi->viid, new_mtu, -1, -1,
+                           -1, -1, true);
+       if (!err)
+               eth_dev->data->dev_conf.rxmode.max_rx_pkt_len = new_mtu;
+
+       return err;
+}
+
 static int cxgbe_dev_tx_queue_start(struct rte_eth_dev *eth_dev,
                                    uint16_t tx_queue_id);
 static int cxgbe_dev_rx_queue_start(struct rte_eth_dev *eth_dev,
@@ -724,6 +752,7 @@ static struct eth_dev_ops cxgbe_eth_dev_ops = {
        .dev_configure          = cxgbe_dev_configure,
        .dev_infos_get          = cxgbe_dev_info_get,
        .link_update            = cxgbe_dev_link_update,
+       .mtu_set                = cxgbe_dev_mtu_set,
        .tx_queue_setup         = cxgbe_dev_tx_queue_setup,
        .tx_queue_start         = cxgbe_dev_tx_queue_start,
        .tx_queue_stop          = cxgbe_dev_tx_queue_stop,