On Tue, Oct 31, 2017 at 5:41 AM, Björn Töpel <bjorn.to...@gmail.com> wrote:
> From: Björn Töpel <bjorn.to...@intel.com>
>
> +/*
> + * struct tpacket_memreg_req is used in conjunction with PACKET_MEMREG
> + * to register user memory which should be used to store the packet
> + * data.
> + *
> + * There are some constraints for the memory being registered:
> + * - The memory area has to be memory page size aligned.
> + * - The frame size has to be a power of 2.
> + * - The frame size cannot be smaller than 2048B.
> + * - The frame size cannot be larger than the memory page size.
> + *
> + * Corollary: The number of frames that can be stored is
> + * len / frame_size.
> + *
> + */
> +struct tpacket_memreg_req {
> + unsigned long addr; /* Start of packet data area */
> + unsigned long len; /* Length of packet data area */
> + unsigned int frame_size; /* Frame size */
> + unsigned int data_headroom; /* Frame head room */
> +};
> +
I have not reviewed the entire patchset but I think if we could add a
version_hdr and then unionize the fields, it might be easier to add
SVM support without having to spin v5. I could be wrong though.
Chetan
