[dpdk-dev] [RFC PATCH] i40e: fix setting of default MAC address

[Wu, Jingjing]

Hi, Igor

Thanks for your contribute, my comments are in below, thanks.

> -----Original Message-----
> From: Igor Ryzhov [mailto:iryzhov at nfware.com]
> Sent: Thursday, November 24, 2016 8:35 PM
> To: dev at dpdk.org
> Cc: Zhang, Helin <helin.zhang at intel.com>; Wu, Jingjing
> <jingjing.wu at intel.com>
> Subject: [RFC PATCH] i40e: fix setting of default MAC address
> 
> While testing X710 cards in our lab I found that setting of default MAC
> address doesn't work correctly for i40e driver. I compared DPDK driver
> implementation with Linux driver implementation and found that a lot of
> code is lost in DPDK.
> I tried to make DPDK implementation similar to Linux implementation and it
> worked for me – now everything is working. But I'm not sure that my
> changes are correct so, please, maintainers, check the patch very careful.
> 
> Signed-off-by: Igor Ryzhov <iryzhov at nfware.com>
> ---
>  drivers/net/i40e/i40e_ethdev.c | 30 ++++++++++++++++++++++++++++--
>  1 file changed, 28 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/net/i40e/i40e_ethdev.c b/drivers/net/i40e/i40e_ethdev.c
> index 67778ba..b73f9c8 100644
> --- a/drivers/net/i40e/i40e_ethdev.c
> +++ b/drivers/net/i40e/i40e_ethdev.c
> @@ -9694,6 +9694,7 @@ 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)
>  {
> +	struct i40e_vsi *vsi =
> +I40E_DEV_PRIVATE_TO_MAIN_VSI(dev->data->dev_private);
>  	struct i40e_hw *hw = I40E_DEV_PRIVATE_TO_HW(dev->data-
> >dev_private);
> 
>  	if (!is_valid_assigned_ether_addr(mac_addr)) { @@ -9701,8 +9702,33
> @@ static void i40e_set_default_mac_addr(struct rte_eth_dev *dev,
>  		return;
>  	}
> 
> -	/* Flags: 0x3 updates port address */
> -	i40e_aq_mac_address_write(hw, 0x3, mac_addr->addr_bytes,
> NULL);
> +	i40e_aq_mac_address_write(hw, I40E_AQC_WRITE_TYPE_LAA_WOL,
> +mac_addr->addr_bytes, NULL);
> +
> +	if (!memcmp(&dev->data->mac_addrs[0].addr_bytes, hw-
> >mac.addr, ETH_ADDR_LEN)) {
> +		struct i40e_aqc_remove_macvlan_element_data element;
> +
> +		memset(&element, 0, sizeof(element));
> +		memcpy(element.mac_addr, &dev->data-
> >mac_addrs[0].addr_bytes, ETH_ADDR_LEN);
> +		element.flags = I40E_AQC_MACVLAN_DEL_PERFECT_MATCH;
> +		i40e_aq_remove_macvlan(hw, vsi->seid, &element, 1, NULL);
> +	} else {
> +		i40e_vsi_delete_mac(vsi, &dev->data->mac_addrs[0]);
> +	}
> +
> +	if (!memcmp(mac_addr->addr_bytes, hw->mac.addr,
> ETH_ADDR_LEN)) {

In rte_eth_dev_default_mac_addr_set, before call dev_ops->mac_addr_set,
The dev->data->mac_addrs[0] is already set to the input addr.

So the if loop is the same as above if, why not merge them? 


If you look the code in eth_i40e_dev_init, you will found the dev->data->mac_addrs[0]
Is just the hw->mac.addr. And I think we need to make them same all the time.
So hw->mac.addr may also need to be updated.


Thanks for figure it out!

/Jingjing