diff options
author | David S. Miller <davem@davemloft.net> | 2017-04-18 15:36:58 -0400 |
---|---|---|
committer | David S. Miller <davem@davemloft.net> | 2017-04-25 13:33:49 -0400 |
commit | b5cdae3291f7be7a34e75affe4c0ec1f7f328b64 (patch) | |
tree | ca1a8fc4ef95aa3e6e66353791dcb74cad8bc0c2 /net/core/gro_cells.c | |
parent | 2f7878c06e2d227aa5c405ddde356403b83e3509 (diff) | |
download | op-kernel-dev-b5cdae3291f7be7a34e75affe4c0ec1f7f328b64.zip op-kernel-dev-b5cdae3291f7be7a34e75affe4c0ec1f7f328b64.tar.gz |
net: Generic XDP
This provides a generic SKB based non-optimized XDP path which is used
if either the driver lacks a specific XDP implementation, or the user
requests it via a new IFLA_XDP_FLAGS value named XDP_FLAGS_SKB_MODE.
It is arguable that perhaps I should have required something like
this as part of the initial XDP feature merge.
I believe this is critical for two reasons:
1) Accessibility. More people can play with XDP with less
dependencies. Yes I know we have XDP support in virtio_net, but
that just creates another depedency for learning how to use this
facility.
I wrote this to make life easier for the XDP newbies.
2) As a model for what the expected semantics are. If there is a pure
generic core implementation, it serves as a semantic example for
driver folks adding XDP support.
One thing I have not tried to address here is the issue of
XDP_PACKET_HEADROOM, thanks to Daniel for spotting that. It seems
incredibly expensive to do a skb_cow(skb, XDP_PACKET_HEADROOM) or
whatever even if the XDP program doesn't try to push headers at all.
I think we really need the verifier to somehow propagate whether
certain XDP helpers are used or not.
v5:
- Handle both negative and positive offset after running prog
- Fix mac length in XDP_TX case (Alexei)
- Use rcu_dereference_protected() in free_netdev (kbuild test robot)
v4:
- Fix MAC header adjustmnet before calling prog (David Ahern)
- Disable LRO when generic XDP is installed (Michael Chan)
- Bypass qdisc et al. on XDP_TX and record the event (Alexei)
- Do not perform generic XDP on reinjected packets (DaveM)
v3:
- Make sure XDP program sees packet at MAC header, push back MAC
header if we do XDP_TX. (Alexei)
- Elide GRO when generic XDP is in use. (Alexei)
- Add XDP_FLAG_SKB_MODE flag which the user can use to request generic
XDP even if the driver has an XDP implementation. (Alexei)
- Report whether SKB mode is in use in rtnl_xdp_fill() via XDP_FLAGS
attribute. (Daniel)
v2:
- Add some "fall through" comments in switch statements based
upon feedback from Andrew Lunn
- Use RCU for generic xdp_prog, thanks to Johannes Berg.
Tested-by: Andy Gospodarek <andy@greyhouse.net>
Tested-by: Jesper Dangaard Brouer <brouer@redhat.com>
Tested-by: David Ahern <dsa@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/core/gro_cells.c')
-rw-r--r-- | net/core/gro_cells.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/net/core/gro_cells.c b/net/core/gro_cells.c index c98bbfb..814e58a 100644 --- a/net/core/gro_cells.c +++ b/net/core/gro_cells.c @@ -13,7 +13,7 @@ int gro_cells_receive(struct gro_cells *gcells, struct sk_buff *skb) struct net_device *dev = skb->dev; struct gro_cell *cell; - if (!gcells->cells || skb_cloned(skb) || !(dev->features & NETIF_F_GRO)) + if (!gcells->cells || skb_cloned(skb) || netif_elide_gro(dev)) return netif_rx(skb); cell = this_cpu_ptr(gcells->cells); |