Commit bb520736 authored by Magnus Karlsson's avatar Magnus Karlsson Committed by Tony Nguyen
Browse files

ice: optimize for XDP_REDIRECT in xsk path 



Optimize ice_run_xdp_zc() for the XDP program verdict being
XDP_REDIRECT in the xsk zero-copy path. This path is only used when
having AF_XDP zero-copy on and in that case most packets will be
directed to user space. This provides a little over 100k extra packets
in throughput on my server when running l2fwd in xdpsock.

Signed-off-by: default avatarMagnus Karlsson <magnus.karlsson@intel.com>
Tested-by: default avatarGeorge Kuruvinakunnel <george.kuruvinakunnel@intel.com>
Signed-off-by: default avatarTony Nguyen <anthony.l.nguyen@intel.com>
parent 7d52fe2e

drivers/net/ethernet/intel/ice/ice_xsk.c

+8 −4
Original line number Diff line number Diff line
@@ -473,6 +473,14 @@ ice_run_xdp_zc(struct ice_ring *rx_ring, struct xdp_buff *xdp) 
	xdp_prog = READ_ONCE(rx_ring->xdp_prog);



	act = bpf_prog_run_xdp(xdp_prog, xdp);



	if (likely(act == XDP_REDIRECT)) {

		err = xdp_do_redirect(rx_ring->netdev, xdp, xdp_prog);

		result = !err ? ICE_XDP_REDIR : ICE_XDP_CONSUMED;

		rcu_read_unlock();

		return result;

	}



	switch (act) {

	case XDP_PASS:

		break;
@@ -480,10 +488,6 @@ ice_run_xdp_zc(struct ice_ring *rx_ring, struct xdp_buff *xdp) 
		xdp_ring = rx_ring->vsi->xdp_rings[rx_ring->q_index];

		result = ice_xmit_xdp_buff(xdp, xdp_ring);

		break;

	case XDP_REDIRECT:

		err = xdp_do_redirect(rx_ring->netdev, xdp, xdp_prog);

		result = !err ? ICE_XDP_REDIR : ICE_XDP_CONSUMED;

		break;

	default:

		bpf_warn_invalid_xdp_action(act);

		fallthrough;