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bpf, devmap: Move drop error path to devmap for XDP_REDIRECT

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We want to change the current ndo_xdp_xmit drop semantics because it will
allow us to implement better queue overflow handling. This is working
towards the larger goal of a XDP TX queue-hook. Move XDP_REDIRECT error
path handling from each XDP ethernet driver to devmap code. According to
the new APIs, the driver running the ndo_xdp_xmit pointer, will break tx
loop whenever the hw reports a tx error and it will just return to devmap
caller the number of successfully transmitted frames. It will be devmap
responsibility to free dropped frames.

Move each XDP ndo_xdp_xmit capable driver to the new APIs:

- veth
- virtio-net
- mvneta
- mvpp2
- socionext
- amazon ena
- bnxt
- freescale (dpaa2, dpaa)
- xen-frontend
- qede
- ice
- igb
- ixgbe
- i40e
- mlx5
- ti (cpsw, cpsw-new)
- tun
- sfc

Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Reviewed-by: Ioana Ciornei <ioana.ciornei@nxp.com>
Reviewed-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>
Reviewed-by: Camelia Groza <camelia.groza@nxp.com>
Acked-by: Edward Cree <ecree.xilinx@gmail.com>
Acked-by: Jesper Dangaard Brouer <brouer@redhat.com>
Acked-by: Shay Agroskin <shayagr@amazon.com>
Link: https://lore.kernel.org/bpf/ed670de24f951cfd77590decf0229a0ad7fd12f6.1615201152.git.lorenzo@kernel.org
This commit is contained in:
Lorenzo Bianconi 2021-03-08 12:06:58 +01:00 • committed by Daniel Borkmann
parent 6b28276512
commit fdc13979f9
22 changed files with 153 additions and 200 deletions
Download patch file Download diff file Expand all files Collapse all files

30
kernel/bpf/devmap.c
View file

@ -329,7 +329,7 @@ bool dev_map_can_have_prog(struct bpf_map *map)
static void bq_xmit_all(struct xdp_dev_bulk_queue *bq, u32 flags)
{
struct net_device *dev = bq->dev;
int sent = 0, drops = 0, err = 0;
int sent = 0, err = 0;
int i;
if (unlikely(!bq->count))
@ -343,29 +343,23 @@ static void bq_xmit_all(struct xdp_dev_bulk_queue *bq, u32 flags)
sent = dev->netdev_ops->ndo_xdp_xmit(dev, bq->count, bq->q, flags);
if (sent < 0) {
/* If ndo_xdp_xmit fails with an errno, no frames have
* been xmit'ed.
*/
err = sent;
sent = 0;
goto error;
}
drops = bq->count - sent;
out:
bq->count = 0;
trace_xdp_devmap_xmit(bq->dev_rx, dev, sent, drops, err);
bq->dev_rx = NULL;
__list_del_clearprev(&bq->flush_node);
return;
error:
/* If ndo_xdp_xmit fails with an errno, no frames have been
* xmit'ed and it's our responsibility to them free all.
/* If not all frames have been transmitted, it is our
* responsibility to free them
*/
for (i = 0; i < bq->count; i++) {
struct xdp_frame *xdpf = bq->q[i];
for (i = sent; unlikely(i < bq->count); i++)
xdp_return_frame_rx_napi(bq->q[i]);
xdp_return_frame_rx_napi(xdpf);
drops++;
}
goto out;
trace_xdp_devmap_xmit(bq->dev_rx, dev, sent, bq->count - sent, err);
bq->dev_rx = NULL;
bq->count = 0;
__list_del_clearprev(&bq->flush_node);
}
/* __dev_flush is called from xdp_do_flush() which _must_ be signaled