Re: [PATCH v6 net-next 5/5] net: ethernet: ti: cpsw: add XDP support

From: Ivan Khoronzhuk
Date: Thu Jul 04 2019 - 05:43:41 EST

On Thu, Jul 04, 2019 at 12:39:02PM +0300, Ilias Apalodimas wrote:
On Thu, Jul 04, 2019 at 11:19:39AM +0200, Jesper Dangaard Brouer wrote:
On Wed, 3 Jul 2019 13:19:03 +0300
Ivan Khoronzhuk <ivan.khoronzhuk@xxxxxxxxxx> wrote:

> Add XDP support based on rx page_pool allocator, one frame per page.
> Page pool allocator is used with assumption that only one rx_handler
> is running simultaneously. DMA map/unmap is reused from page pool
> despite there is no need to map whole page.
> Due to specific of cpsw, the same TX/RX handler can be used by 2
> network devices, so special fields in buffer are added to identify
> an interface the frame is destined to. Thus XDP works for both
> interfaces, that allows to test xdp redirect between two interfaces
> easily. Aslo, each rx queue have own page pools, but common for both
> netdevs.
> XDP prog is common for all channels till appropriate changes are added
> in XDP infrastructure. Also, once page_pool recycling becomes part of
> skb netstack some simplifications can be added, like removing
> page_pool_release_page() before skb receive.
> In order to keep rx_dev while redirect, that can be somehow used in
> future, do flush in rx_handler, that allows to keep rx dev the same
> while reidrect. It allows to conform with tracing rx_dev pointed
> by Jesper.

So, you simply call xdp_do_flush_map() after each xdp_do_redirect().
It will kill RX-bulk and performance, but I guess it will work.

I guess, we can optimized it later, by e.g. in function calling
cpsw_run_xdp() have a variable that detect if net_device changed
(priv->ndev) and then call xdp_do_flush_map() when needed.
I tried something similar on the netsec driver on my initial development.
On the 1gbit speed NICs i saw no difference between flushing per packet vs
flushing on the end of the NAPI handler.
The latter is obviously better but since the performance impact is negligible on
this particular NIC, i don't think this should be a blocker.
Please add a clear comment on this and why you do that on this driver,
so people won't go ahead and copy/paste this approach
Sry, but I did this already, is it not enouph?

Ivan Khoronzhuk