netdev - Re: [PATCH net-next 1/4] net: systemport: add Broadcom SYSTEMPORT Ethernet MAC driver

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Date:	Mon, 21 Apr 2014 14:26:25 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	f.fainelli@...il.com
Cc:	netdev@...r.kernel.org
Subject: Re: [PATCH net-next 1/4] net: systemport: add Broadcom SYSTEMPORT
 Ethernet MAC driver

From: Florian Fainelli <f.fainelli@...il.com>
Date: Mon, 21 Apr 2014 10:51:05 -0700

> 2014-04-21 10:46 GMT-07:00 David Miller <davem@...emloft.net>:
>> From: Florian Fainelli <f.fainelli@...il.com>
>> Date: Mon, 21 Apr 2014 10:31:31 -0700
>>
>>> +#ifdef CONFIG_PHYS_ADDR_T_64BIT
>>> +     __raw_writel(upper_32_bits(addr) & DESC_ADDR_HI_MASK,
>>> +                             d + DESC_ADDR_HI_STATUS_LEN);
>>> +#endif
>>
>> When a function call spans multiple lines, the arguments on the second
>> and subsequent lines need to start exactly at the first column after
>> the openning parenthesis.
>>
>> Please audit and fix this in your entire submission.
>>
>>> +static int bcm_sysport_set_settings(struct net_device *dev,
>>> +                                 struct ethtool_cmd *cmd)
>>
>> Likewise for functions declarations and definitions.
>>
>> Also, no NAPI support?  The locking and SKB freeing looks quite baroque
>> as a consequence of this.
> 
> There is NAPI support for the RX path, transmitted SKBs are freed when
> the buffer done interrupt fires, I can certainly rework that if you
> feel like it would be better to get per tx-queue NAPI contexts
> instead.

The less you do dev_kfree_skb_any() the less context switches you make
in and out of the softirq dispatch.
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