Expand mirror functionality

In order to deal with non-symmetrical load, the mirror function can now
change the packet size of each packet it receives. It can also send the
incoming packet multiple times on each of the tx ports. To support this
feature, 2 new parameters in the cfg file have been added for the mirror
mode:
- multiplier: specifies how many times a packet needs to be sent on each
  tx port. Default is 1.
- mirror_size: the size of the packets that need to be sent. This will
  just change (increase) the packet size of each incoming packet. If not
  specified or invalid value (e.g. <64), the size will not be changed.
The packet size will only be changed for IPv4 UDP and IPv4 TCP.
Note that these parameters have no effect on the mirror copy submode.

Change-Id: Ic46b52abdd80ed51cffee667bd04ade9ec23ff6d
Signed-off-by: Luc Provoost <luc.provoost@intel.com>

1 files changed, 37 insertions, 6 deletions

diff --git a/VNFs/DPPD-PROX/handle_mirror.c b/VNFs/DPPD-PROX/handle_mirror.c
index 894ea799..8e6eb6d4 100644
--- a/VNFs/DPPD-PROX/handle_mirror.c
+++ b/VNFs/DPPD-PROX/handle_mirror.c
@@ -24,6 +24,8 @@
 #include "log.h"
 #include "prox_port_cfg.h"
 #include "quit.h"
+#include "prox_cksum.h"
+#include "prefetch.h"
 
 /* Task that sends packets to multiple outputs. Note that in case of n
    outputs, the output packet rate is n times the input packet
@@ -34,7 +36,9 @@
    way to resolve this is to create deep copies of the packet. */
 struct task_mirror {
 	struct task_base base;
-	uint32_t         n_dests;
+	uint32_t	n_dests;
+	uint32_t	multiplier;
+	uint32_t	mirror_size;
 };
 
 struct task_mirror_copy {
@@ -55,14 +59,40 @@ static int handle_mirror_bulk(struct task_base *tbase, struct rte_mbuf **mbufs,
 	   multiple times, the pointers are copied first. This copy is
 	   used in each call to tx_pkt below. */
 	rte_memcpy(mbufs2, mbufs, sizeof(mbufs[0]) * n_pkts);
-
+	/* prefetch for optimization */
+	prox_rte_ether_hdr * hdr[MAX_PKT_BURST];
+	//for (uint16_t i = 0; i < n_pkts; ++i) {
+	//	PREFETCH0(mbufs2[i]);
+	//}
+	for (uint16_t j = 0; j < n_pkts; ++j) {
+		hdr[j] = rte_pktmbuf_mtod(mbufs2[j], prox_rte_ether_hdr *);
+		PREFETCH0(hdr[j]);
+	}
 	for (uint16_t j = 0; j < n_pkts; ++j) {
-		rte_pktmbuf_refcnt_update(mbufs2[j], task->n_dests - 1);
+		rte_pktmbuf_refcnt_update(mbufs2[j], (task->n_dests - 1) * task->multiplier);
+		prox_rte_ipv4_hdr *pip = (prox_rte_ipv4_hdr *) (hdr[j] + 1);
+		if ((task->mirror_size != 0) && (hdr[j]->ether_type == RTE_ETHER_TYPE_IPV4) && ((pip->next_proto_id == IPPROTO_UDP) || (pip->next_proto_id == IPPROTO_TCP))) {
+			rte_pktmbuf_pkt_len(mbufs2[j]) = task->mirror_size;
+			rte_pktmbuf_data_len(mbufs2[j]) = task->mirror_size;
+			pip->total_length = rte_bswap16(task->mirror_size-sizeof(prox_rte_ether_hdr));
+			pip->hdr_checksum = 0;
+			prox_ip_cksum_sw(pip);
+			int l4_len = task->mirror_size - sizeof(prox_rte_ether_hdr) - sizeof(prox_rte_ipv4_hdr);
+			if (pip->next_proto_id == IPPROTO_UDP) {
+				prox_rte_udp_hdr *udp = (prox_rte_udp_hdr *)(((uint8_t *)pip) + sizeof(prox_rte_ipv4_hdr));
+				udp->dgram_len = rte_bswap16(l4_len);
+				prox_udp_cksum_sw(udp, l4_len, pip->src_addr, pip->dst_addr);
+			} else if (pip->next_proto_id == IPPROTO_TCP) {
+				prox_rte_tcp_hdr *tcp = (prox_rte_tcp_hdr *)(((uint8_t *)pip) + sizeof(prox_rte_ipv4_hdr));
+				prox_tcp_cksum_sw(tcp, l4_len, pip->src_addr, pip->dst_addr);
+			}
+		}
 	}
 	for (uint16_t j = 0; j < task->n_dests; ++j) {
 		memset(out, j, n_pkts);
-
-		ret+= task->base.tx_pkt(&task->base, mbufs2, n_pkts, out);
+		for (uint16_t i = 0; i < task->multiplier; ++i) {
+			ret += task->base.tx_pkt(&task->base, mbufs2, n_pkts, out);
+		}
 	}
 	return ret;
 }
@@ -110,8 +140,9 @@ static int handle_mirror_bulk_copy(struct task_base *tbase, struct rte_mbuf **mb
 static void init_task_mirror(struct task_base *tbase, struct task_args *targ)
 {
 	struct task_mirror *task = (struct task_mirror *)tbase;
-
 	task->n_dests = targ->nb_txports? targ->nb_txports : targ->nb_txrings;
+	task->multiplier = targ->multiplier? targ->multiplier : 1;
+	task->mirror_size = targ->mirror_size > 63? targ->mirror_size: 0;
 }
 
 static void init_task_mirror_copy(struct task_base *tbase, struct task_args *targ)