netdev - Re: [RFC PATCH v2 1/2] net: af_packet support for direct ring access in user space

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Message-ID: <54B4A230.9000602@gmail.com>
Date:	Mon, 12 Jan 2015 20:42:24 -0800
From:	John Fastabend <john.fastabend@...il.com>
To:	netdev@...r.kernel.org
CC:	danny.zhou@...el.com, nhorman@...driver.com, dborkman@...hat.com,
	john.ronciak@...el.com, hannes@...essinduktion.org,
	brouer@...hat.com, Or Gerlitz <gerlitz.or@...il.com>
Subject: Re: [RFC PATCH v2 1/2] net: af_packet support for direct ring access
 in user space

On 01/12/2015 08:35 PM, John Fastabend wrote:
> This patch adds net_device ops to split off a set of driver queues
> from the driver and map the queues into user space via mmap. This
> allows the queues to be directly manipulated from user space. For
> raw packet interface this removes any overhead from the kernel network
> stack.
>

+cc: Or Gerlitz

[...]

> +
> +struct tpacket_dev_info {
> +	__u16	tp_device_id;
> +	__u16	tp_vendor_id;
> +	__u16	tp_subsystem_device_id;
> +	__u16	tp_subsystem_vendor_id;
> +	__u32	tp_numa_node;
> +	__u32	tp_revision_id;
> +	__u32	tp_num_total_qpairs;
> +	__u32	tp_num_inuse_qpairs;
> +	__u32	tp_num_rx_desc_fmt;
> +	__u32	tp_num_tx_desc_fmt;
> +	struct tpacket_nic_desc_expr tp_rx_dexpr[PACKET_MAX_NUM_DESC_FORMATS];
> +	struct tpacket_nic_desc_expr tp_tx_dexpr[PACKET_MAX_NUM_DESC_FORMATS];

At least one reason this is still RFCs is this needs to be
cleaned up.

net/packet/af_packet.c: In function ‘packet_getsockopt’:
net/packet/af_packet.c:3918:1: warning: the frame size of 9264 bytes is 
larger than 2048 bytes [-Wframe-larger-than=]

but I wanted to see if there was any feedback.

Thanks,
John

-- 
John Fastabend         Intel Corporation
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