bpf/cpumap.c: Remove unnecessary TODO comment

After discussion with bpf maintainers[1], queue_index could
be propagated to the remote XDP program by the xdp_md struct[2]
which makes this todo a misguide for future effort.

[1]:https://lore.kernel.org/all/[email protected]/
[2]:https://docs.ebpf.io/linux/helper-function/bpf_xdp_adjust_meta/

Signed-off-by: Mehdi Ben Hadj Khelifa <[email protected]>

Author: Mehdi Ben Hadj Khelifa

kernel/bpf/cpumap.c

@@ -195,8 +195,10 @@ static int cpu_map_bpf_prog_run_xdp(struct bpf_cpu_map_entry *rcpu,
 
 		rxq.dev = xdpf->dev_rx;
 		rxq.mem.type = xdpf->mem_type;
-		/* TODO: report queue_index to xdp_rxq_info */
-
+		/* RX queue_index is not preserved after redirection.
+		 * If needed, the sender can embed it in XDP metadata
+		 * (via bpf_xdp_adjust_meta) for the remote program.
+		 */
 		xdp_convert_frame_to_buff(xdpf, &xdp);
 
 		act = bpf_prog_run_xdp(rcpu->prog, &xdp);