dpaa2-eth: add rx copybreak support

Browse source

DMA unmapping, allocating a new buffer and DMA mapping it back on the
refill path is really not that efficient. Proper buffer recycling (page
pool, flipping the page and using the other half) cannot be done for
DPAA2 since it's not a ring based controller but it rather deals with
multiple queues which all get their buffers from the same buffer pool on
Rx.

To circumvent these limitations, add support for Rx copybreak. For small
sized packets instead of creating a skb around the buffer in which the
frame was received, allocate a new sk buffer altogether, copy the
contents of the frame and release the initial page back into the buffer
pool.

Signed-off-by: Ioana Ciornei <ioana.ciornei@nxp.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>

...

This commit is contained in:

Ioana Ciornei 2021-04-02 12:55:31 +03:00 • committed by David S. Miller

parent 28d137cc8c

commit 50f826999a

2 changed files with 36 additions and 3 deletions

Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL

Download patch file Download diff file Expand all files Collapse all files

37

drivers/net/ethernet/freescale/dpaa2/dpaa2-eth.c

View file

2

drivers/net/ethernet/freescale/dpaa2/dpaa2-eth.h

View file