Does AF_XDP support multithread rx packet with a nic ring?

[ChenYahui2019]

I created 4 AF_XDP sockets sharing one umen with XDP_SHARED_UMEM. Fourt threads only doing rx_drop pkts for each socket. But it seems AF_XDP not support concurrent receiving packets.

So, does AF_XDP support concurrent rx pkts and why?

[hi-glenn]

Of course, it support.

Attention:

1. nic queue id
2. bpf_redirect_map(&xsks_map, af_xdp_socket_index, 0), af_xdp_socket_index should be corresponding to the correct socket.