netdev - Re: [PATCH net] cxgb4: fix MPS index overwrite when setting MAC address

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Date:   Wed, 01 Apr 2020 11:19:30 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     rahul.lakkireddy@...lsio.com
Cc:     netdev@...r.kernel.org, herat@...lsio.com, nirranjan@...lsio.com,
        vishal@...lsio.com, dt@...lsio.com
Subject: Re: [PATCH net] cxgb4: fix MPS index overwrite when setting MAC
 address

From: Rahul Lakkireddy <rahul.lakkireddy@...lsio.com>
Date: Wed,  1 Apr 2020 01:16:09 +0530

> From: Herat Ramani <herat@...lsio.com>
> 
> cxgb4_update_mac_filt() earlier requests firmware to add a new MAC
> address into MPS TCAM. The MPS TCAM index returned by firmware is
> stored in pi->xact_addr_filt. However, the saved MPS TCAM index gets
> overwritten again with the return value of cxgb4_update_mac_filt(),
> which is wrong.
> 
> When trying to update to another MAC address later, the wrong MPS TCAM
> index is sent to firmware, which causes firmware to return error,
> because it's not the same MPS TCAM index that firmware had sent
> earlier to driver.
> 
> So, fix by removing the wrong overwrite being done after call to
> cxgb4_update_mac_filt().
> 
> Fixes: 3f8cfd0d95e6 ("cxgb4/cxgb4vf: Program hash region for {t4/t4vf}_change_mac()")
> Signed-off-by: Herat Ramani <herat@...lsio.com>
> Signed-off-by: Rahul Lakkireddy <rahul.lakkireddy@...lsio.com>

Applied and queued up for -stable.