Re: [dpdk-dev] ixgbe : query regarding your code changes for VF mac add

[Ivan Boule <ivan.boule@6wind.com>]

Hi Santosh,

I do not get exactly what you attempt to do on a VF.
Are you first deleting the so-called permanent MAC address by a call to the
function ixgbevf_remove_mac_addr() ? This operation is not allowed.
Can you explain exactly the sequence of operations that are done, so that I
can understand how the test (memcmp(hw->mac.perm_addr, mac_addr,
sizeof(struct ether_addr)) == 0) in the function ixgbevf_add_mac_addr()
prevents them to be successfully performed.

Ivan

PS : please, can you CC your emails to dev@dpdk.org


2016-04-19 17:01 GMT+02:00 santosh <santosh.iitg@gmail.com>:

> Hi Ivan,
>
> Your following code changes causing issue in Vmware environment.
>
> ----------------------------------- -------------------
> ------------------------------
> + /*
> + * On a 82599 VF, adding again the same MAC addr is not an idempotent
> + * operation. Trap this case to avoid exhausting the [very limited]
> + * set of PF resources used to store VF MAC addresses.
> + */
> + if (memcmp(hw->mac.perm_addr, mac_addr, sizeof(struct ether_addr)) == 0)
> + return;
>   diag = ixgbevf_set_uc_addr_vf(hw, 2, mac_addr->addr_bytes);
> --------------------------------------------------------------------
> ------------- -------
>
>
> Issue:
> At CLI , we have provision to add /del MAC of an interface.
> During MAC delete, existing MAC is deleted and default MAC is applied.
> This default MAC is not being applied in VMware environment
> successfully due to "return" statement
> in your above code changes. As a result traffic is stopped completely.
> If I remove above
> "return" statement then traffic continues to flow after MAC delete.
>
> Please let me know your suggestion to handle this scenario .  If I
> remove "return" what will be the consequences ?
>
> If removing "return" statement is not good idea then what are other
> way to handle MAC delete scenario ?  we have only 1 VF per PF in our
> setup as of now.
>
>
> Thanks
> Santosh
>



-- 
Ivan BOULE
6WIND
Software Engineer

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