net, core: Add support for XDP redirection to slave device

mainline inclusion
from mainline-v5.15-rc1
commit 879af96f
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I7NDRB
CVE: NA

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=879af96ffd72706c6e3278ea6b45b0b0e37ec5d7



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This adds the ndo_xdp_get_xmit_slave hook for transforming XDP_TX
into XDP_REDIRECT after BPF program run when the ingress device
is a bond slave.

The dev_xdp_prog_count is exposed so that slave devices can be checked
for loaded XDP programs in order to avoid the situation where both
bond master and slave have programs loaded according to xdp_state.

Signed-off-by: Jussi Maki <joamaki@gmail.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Cc: Jay Vosburgh <j.vosburgh@gmail.com>
Cc: Veaceslav Falico <vfalico@gmail.com>
Cc: Andy Gospodarek <andy@greyhouse.net>
Link: https://lore.kernel.org/bpf/20210731055738.16820-3-joamaki@gmail.com



Conflicts:
	include/linux/filter.h
	include/linux/netdevice.h
	net/core/dev.c
	net/core/filter.c

Signed-off-by: Zhengchao Shao <shaozhengchao@huawei.com>