netdev - Re: [PATCH net] tg3: Fix for disallow tx coalescing time to be 0

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Date:   Wed, 31 Aug 2016 09:19:34 -0700
From:   Michael Chan <michael.chan@...adcom.com>
To:     Ivan Vecera <ivecera@...hat.com>
Cc:     Netdev <netdev@...r.kernel.org>,
        Satish Baddipadige <satish.baddipadige@...adcom.com>,
        Siva Reddy Kallam <siva.kallam@...adcom.com>
Subject: Re: [PATCH net] tg3: Fix for disallow tx coalescing time to be 0

On Wed, Aug 31, 2016 at 2:27 AM, Ivan Vecera <ivecera@...hat.com> wrote:
> Dne 30.8.2016 v 17:46 Michael Chan napsal(a):
>>
>> On Tue, Aug 30, 2016 at 7:38 AM, Ivan Vecera <ivecera@...hat.com> wrote:
>>>
>>> The recent commit 087d7a8c disallows to set Rx coalescing time to be 0
>>> as this stops generating interrupts for the incoming packets. I found
>>> the zero Tx coalescing time stops generating interrupts similarly for
>>> outgoing packets and fires Tx watchdog later. To avoid this, don't allow
>>> to set Tx coalescing time to 0.
>>>
>>> Cc: satish.baddipadige@...adcom.com
>>> Cc: siva.kallam@...adcom.com
>>> Cc: michael.chan@...adcom.com
>>> Signed-off-by: Ivan Vecera <ivecera@...hat.com>
>>> ---
>>>  drivers/net/ethernet/broadcom/tg3.c | 1 +
>>>  1 file changed, 1 insertion(+)
>>>
>>> diff --git a/drivers/net/ethernet/broadcom/tg3.c
>>> b/drivers/net/ethernet/broadcom/tg3.c
>>> index 6592612..07e3beb 100644
>>> --- a/drivers/net/ethernet/broadcom/tg3.c
>>> +++ b/drivers/net/ethernet/broadcom/tg3.c
>>> @@ -14012,6 +14012,7 @@ static int tg3_set_coalesce(struct net_device
>>> *dev, struct ethtool_coalesce *ec)
>>>         if ((ec->rx_coalesce_usecs > MAX_RXCOL_TICKS) ||
>>>             (!ec->rx_coalesce_usecs) ||
>>>             (ec->tx_coalesce_usecs > MAX_TXCOL_TICKS) ||
>>> +           (!ec->tx_coalesce_usecs) ||
>>>             (ec->rx_max_coalesced_frames > MAX_RXMAX_FRAMES) ||
>>>             (ec->tx_max_coalesced_frames > MAX_TXMAX_FRAMES) ||
>>>             (ec->rx_coalesce_usecs_irq > max_rxcoal_tick_int) ||
>>
>>
>>
>> As Rick pointed out last time, we can remove this check which follows
>> the block of code above:
>>
>> /* No tx interrupts will be generated if both are zero */
>> if ((ec->tx_coalesce_usecs == 0) &&
>>    (ec->tx_max_coalesced_frames == 0))
>> return -EINVAL;
>>
> Michael,
> should I add the removal of these checks to v2?
>
Yes, please remove both the TX and the RX checks.  Thanks.