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Date: Sat, 18 May 2019 20:10:46 -0700 From: Stephen Hemminger <stephen@...workplumber.org> To: netdev@...r.kernel.org, davem@...emloft.net Cc: xdp-newbies@...r.kernel.org, bpf@...r.kernel.org, Stephen Hemminger <sthemmin@...rosoft.com>, Jason Wang <jasowang@...hat.com> Subject: [PATCH v2 net 2/2] net: core: generic XDP support for stacked device When a device is stacked like (team, bonding, failsafe or netvsc) the XDP generic program for the parent device is not called. In these cases, the rx handler changes skb->dev to its own in the receive handler, and returns RX_HANDLER_ANOTHER. Fix this by calling do_xdp_generic if necessary before starting another round. Review of all the places RX_HANDLER_ANOTHER is returned show that the current devices do correctly change skb->dev. There was an older patch that got abandoned that did the same thing, this is just a rewrite. Suggested-by: Jason Wang <jasowang@...hat.com> Fixes: d445516966dc ("net: xdp: support xdp generic on virtual devices") Signed-off-by: Stephen Hemminger <sthemmin@...rosoft.com> Acked-by: Jason Wang <jasowang@...hat.com> --- net/core/dev.c | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/net/core/dev.c b/net/core/dev.c index b6b8505cfb3e..240d0b2de1a8 100644 --- a/net/core/dev.c +++ b/net/core/dev.c @@ -4921,6 +4921,16 @@ static int __netif_receive_skb_core(struct sk_buff *skb, bool pfmemalloc, ret = NET_RX_SUCCESS; goto out; case RX_HANDLER_ANOTHER: + if (static_branch_unlikely(&generic_xdp_needed_key)) { + struct bpf_prog *xdp_prog; + + xdp_prog = rcu_dereference(skb->dev->xdp_prog); + ret = do_xdp_generic(xdp_prog, skb); + if (ret != XDP_PASS) { + ret = NET_RX_SUCCESS; + goto out; + } + } goto another_round; case RX_HANDLER_EXACT: deliver_exact = true; -- 2.20.1
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