disable IP ID in real packets

net/ipv4/ip_output.c

@@ -79,6 +79,9 @@
 #include <linux/netfilter_bridge.h>
 #include <linux/netlink.h>
 #include <linux/tcp.h>
+#if defined(CONFIG_PACER_TCP)
+#include "../../../drivers/net/ethernet/broadcom/bnx2x/sme/ptcp_hooks.h"
+#endif
 
 static int
 ip_fragment(struct net *net, struct sock *sk, struct sk_buff *skb,
@@ -146,6 +149,9 @@ int ip_build_and_send_pkt(struct sk_buff *skb, const struct sock *sk,
 	struct rtable *rt = skb_rtable(skb);
 	struct net *net = sock_net(sk);
 	struct iphdr *iph;
+#if defined(CONFIG_XEN_SME) && defined(CONFIG_PACER_TCP)
+  int paced_ret = ptcp_is_paced_flow((struct sock *) sk);
+#endif
 
 	/* Build the IP header. */
 	skb_push(skb, sizeof(struct iphdr) + (opt ? opt->opt.optlen : 0));
@@ -166,6 +172,12 @@ int ip_build_and_send_pkt(struct sk_buff *skb, const struct sock *sk,
 		__ip_select_ident(net, iph, 1);
 	}
 
+#if defined(CONFIG_XEN_SME) && defined(CONFIG_PACER_TCP)
+  if (paced_ret == 0) {
+    iph->id = 0;
+  }
+#endif
+
 	if (opt && opt->opt.optlen) {
 		iph->ihl += opt->opt.optlen>>2;
 		ip_options_build(skb, &opt->opt, daddr, rt, 0);
@@ -406,6 +418,9 @@ int ip_queue_xmit(struct sock *sk, struct sk_buff *skb, struct flowi *fl)
 	struct rtable *rt;
 	struct iphdr *iph;
 	int res;
+#if defined(CONFIG_XEN_SME) && defined(CONFIG_PACER_TCP)
+  int paced_ret = ptcp_is_paced_flow(sk);
+#endif
 
 	/* Skip all of this if the packet is already routed,
 	 * f.e. by something like SCTP.
@@ -471,6 +486,12 @@ packet_routed:
 	ip_select_ident_segs(net, skb, sk,
 			     skb_shinfo(skb)->gso_segs ?: 1);
 
+#if defined(CONFIG_XEN_SME) && defined(CONFIG_PACER_TCP)
+  if (paced_ret == 0) {
+    iph->id = 0;
+  }
+#endif
+
 	/* TODO : should we use skb->sk here instead of sk ? */
 	skb->priority = sk->sk_priority;
 	skb->mark = sk->sk_mark;