net/af_packet: support MTU change

The underlying Linux device's MTU is changed subject to the frame size
limitations during device creation.

Signed-off-by: Chas Williams <ciwillia@brocade.com>
Reviewed-by: Ferruh Yigit <ferruh.yigit@intel.com>

diff --git a/drivers/net/af_packet/rte_eth_af_packet.c b/drivers/net/af_packet/rte_eth_af_packet.c
index 2b01cb0..c841ddc 100644 (file)
--- a/drivers/net/af_packet/rte_eth_af_packet.c
+++ b/drivers/net/af_packet/rte_eth_af_packet.c
@@ -419,12 +419,41 @@ eth_tx_queue_setup(struct rte_eth_dev *dev,
        return 0;
 }
 
+static int
+eth_dev_mtu_set(struct rte_eth_dev *dev, uint16_t mtu)
+{
+       struct pmd_internals *internals = dev->data->dev_private;
+       struct ifreq ifr = { .ifr_mtu = mtu };
+       int ret;
+       int s;
+       unsigned int data_size = internals->req.tp_frame_size -
+                                TPACKET2_HDRLEN -
+                                sizeof(struct sockaddr_ll);
+
+       if (mtu > data_size)
+               return -EINVAL;
+
+       s = socket(PF_INET, SOCK_DGRAM, 0);
+       if (s < 0)
+               return -EINVAL;
+
+       strncpy(ifr.ifr_name, internals->if_name, IFNAMSIZ);
+       ret = ioctl(s, SIOCSIFMTU, &ifr);
+       close(s);
+
+       if (ret < 0)
+               return -EINVAL;
+
+       return 0;
+}
+
 static const struct eth_dev_ops ops = {
        .dev_start = eth_dev_start,
        .dev_stop = eth_dev_stop,
        .dev_close = eth_dev_close,
        .dev_configure = eth_dev_configure,
        .dev_infos_get = eth_dev_info,
+       .mtu_set = eth_dev_mtu_set,
        .rx_queue_setup = eth_rx_queue_setup,
        .tx_queue_setup = eth_tx_queue_setup,
        .rx_queue_release = eth_queue_release,