Re: [PATCH] i40e: configure MTU

["Wu, Jingjing" <jingjing.wu@intel.com>]

On 4/23/2016 7:26 PM, Xing, Beilei wrote:
> This patch enables configuring MTU for i40e.
> Since changing MTU needs to reconfigure queue, stop port first
> before configuring MTU.
>
> Signed-off-by: Beilei Xing <beilei.xing@intel.com>
> ---
>   drivers/net/i40e/i40e_ethdev.c | 49 ++++++++++++++++++++++++++++++++++++++++++
>   1 file changed, 49 insertions(+)
>
> diff --git a/drivers/net/i40e/i40e_ethdev.c b/drivers/net/i40e/i40e_ethdev.c
> index bc28d3c..29259b9 100644
> --- a/drivers/net/i40e/i40e_ethdev.c
> +++ b/drivers/net/i40e/i40e_ethdev.c
> @@ -447,6 +447,8 @@ static int i40e_get_eeprom(struct rte_eth_dev *dev,
>   static void i40e_set_default_mac_addr(struct rte_eth_dev *dev,
>   				      struct ether_addr *mac_addr);
>   
> +static int i40e_dev_mtu_set(struct rte_eth_dev *dev, uint16_t mtu);
> +
>   static const struct rte_pci_id pci_id_i40e_map[] = {
>   #define RTE_PCI_DEV_ID_DECL_I40E(vend, dev) {RTE_PCI_DEVICE(vend, dev)},
>   #include "rte_pci_dev_ids.h"
> @@ -520,6 +522,7 @@ static const struct eth_dev_ops i40e_eth_dev_ops = {
>   	.get_eeprom_length            = i40e_get_eeprom_length,
>   	.get_eeprom                   = i40e_get_eeprom,
>   	.mac_addr_set                 = i40e_set_default_mac_addr,
> +	.mtu_set                      = i40e_dev_mtu_set,
>   };
>   
>   /* store statistics names and its offset in stats structure */
> @@ -9104,3 +9107,49 @@ static void i40e_set_default_mac_addr(struct rte_eth_dev *dev,
>   	/* Flags: 0x3 updates port address */
>   	i40e_aq_mac_address_write(hw, 0x3, mac_addr->addr_bytes, NULL);
>   }
> +
> +static int i40e_dev_mtu_set(struct rte_eth_dev *dev, uint16_t mtu)
According to the coding style, at function definition, "The function 
type should be on a line by itself preceding the function."
> +{
> +	struct i40e_pf *pf = I40E_DEV_PRIVATE_TO_PF(dev->data->dev_private);
> +	struct i40e_hw *hw = I40E_DEV_PRIVATE_TO_HW(dev->data->dev_private);
> +	struct rte_eth_dev_data *dev_data = pf->dev_data;
> +	struct rte_eth_dev_info dev_info;
> +	struct i40e_rx_queue *rxq;
> +	int i;
> +	uint16_t len;
> +	uint32_t frame_size = mtu + ETHER_HDR_LEN + ETHER_CRC_LEN;
> +	int ret = 0;
> +
> +	i40e_dev_info_get(dev, &dev_info);
> +
> +	/* check if mtu is within the allowed range */
> +	if ((mtu < ETHER_MIN_MTU) || (frame_size > dev_info.max_rx_pktlen))
> +		return -EINVAL;
> +
The dev_info.max_rx_pktlen queried by i40e_dev_info_get is 
"I40E_FRAME_SIZE_MAX".
No need to call the API to get dev info in driver.