optimize code

ubuntu_intermediate/inter_op_ebpf.c

@@ -254,11 +254,12 @@ int inter_op_ebpf(struct xdp_md *ctx)
             ip->tot_len = htons(ntohs(ip->tot_len) - option_length);
 
             // bpf_trace_printk("Packet received on interface %d and option length %d\n", ctx->ingress_ifindex, options_len);
-            // ip->check = iph_csum(ip, data_end);
+            asm volatile("" ::: "memory");
+            ip->check = iph_csum(ip, data_end);
         }
 
         //        int old_check = ip->check;
-        ip->check = iph_csum(ip, data_end);
+        // ip->check = iph_csum(ip, data_end);
         //        if (old_check != ip->check){
         //            bpf_trace_printk("Old checksum %d - New checksum %d\n", old_check, ip->check);
         //        }