[PKTGEN]: Centralize packet overhead tracking

Track the extra packet overhead for VLAN tags, MPLS, IPSEC etc

Signed-off-by: Jamal Hadi Salim <hadi@cyberus.ca>
Signed-off-by: Robert Olsson <robert.olsson@its.uu.se>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 15 insertions, 12 deletions

diff --git a/net/core/pktgen.c b/net/core/pktgen.c
index dffe067e7a7b..9f0a780aa916 100644
--- a/net/core/pktgen.c
+++ b/net/core/pktgen.c
@@ -228,6 +228,7 @@ struct pktgen_dev {
 
         int min_pkt_size;       /* = ETH_ZLEN; */
         int max_pkt_size;       /* = ETH_ZLEN; */
+        int pkt_overhead;       /* overhead for MPLS, VLANs, IPSEC etc */
         int nfrags;
         __u32 delay_us;         /* Default delay */
         __u32 delay_ns;
@@ -2075,6 +2076,13 @@ static void spin(struct pktgen_dev *pkt_dev, __u64 spin_until_us)
         pkt_dev->idle_acc += now - start;
 }
 
+static inline void set_pkt_overhead(struct pktgen_dev *pkt_dev)
+{
+        pkt_dev->pkt_overhead += pkt_dev->nr_labels*sizeof(u32);
+        pkt_dev->pkt_overhead += VLAN_TAG_SIZE(pkt_dev);
+        pkt_dev->pkt_overhead += SVLAN_TAG_SIZE(pkt_dev);
+}
+
 /* Increment/randomize headers according to flags and current values
  * for IP src/dest, UDP src/dst port, MAC-Addr src/dst
  */
@@ -2323,9 +2331,7 @@ static struct sk_buff *fill_packet_ipv4(struct net_device *odev,
 
         datalen = (odev->hard_header_len + 16) & ~0xf;
         skb = alloc_skb(pkt_dev->cur_pkt_size + 64 + datalen +
-                        pkt_dev->nr_labels*sizeof(u32) +
-                        VLAN_TAG_SIZE(pkt_dev) + SVLAN_TAG_SIZE(pkt_dev),
-                        GFP_ATOMIC);
+                        pkt_dev->pkt_overhead, GFP_ATOMIC);
         if (!skb) {
                 sprintf(pkt_dev->result, "No memory");
                 return NULL;
@@ -2368,7 +2374,7 @@ static struct sk_buff *fill_packet_ipv4(struct net_device *odev,
 
         /* Eth + IPh + UDPh + mpls */
         datalen = pkt_dev->cur_pkt_size - 14 - 20 - 8 -
-                  pkt_dev->nr_labels*sizeof(u32) - VLAN_TAG_SIZE(pkt_dev) - SVLAN_TAG_SIZE(pkt_dev);
+                  pkt_dev->pkt_overhead;
         if (datalen < sizeof(struct pktgen_hdr))
                 datalen = sizeof(struct pktgen_hdr);
 
@@ -2391,8 +2397,7 @@ static struct sk_buff *fill_packet_ipv4(struct net_device *odev,
         iph->check = ip_fast_csum((void *)iph, iph->ihl);
         skb->protocol = protocol;
         skb->mac_header = (skb->network_header - ETH_HLEN -
-                           pkt_dev->nr_labels * sizeof(u32) -
-                           VLAN_TAG_SIZE(pkt_dev) - SVLAN_TAG_SIZE(pkt_dev));
+                           pkt_dev->pkt_overhead);
         skb->dev = odev;
         skb->pkt_type = PACKET_HOST;
 
@@ -2662,9 +2667,7 @@ static struct sk_buff *fill_packet_ipv6(struct net_device *odev,
         mod_cur_headers(pkt_dev);
 
         skb = alloc_skb(pkt_dev->cur_pkt_size + 64 + 16 +
-                        pkt_dev->nr_labels*sizeof(u32) +
-                        VLAN_TAG_SIZE(pkt_dev) + SVLAN_TAG_SIZE(pkt_dev),
-                        GFP_ATOMIC);
+                        pkt_dev->pkt_overhead, GFP_ATOMIC);
         if (!skb) {
                 sprintf(pkt_dev->result, "No memory");
                 return NULL;
@@ -2708,7 +2711,7 @@ static struct sk_buff *fill_packet_ipv6(struct net_device *odev,
         /* Eth + IPh + UDPh + mpls */
         datalen = pkt_dev->cur_pkt_size - 14 -
                   sizeof(struct ipv6hdr) - sizeof(struct udphdr) -
-                  pkt_dev->nr_labels*sizeof(u32) - VLAN_TAG_SIZE(pkt_dev) - SVLAN_TAG_SIZE(pkt_dev);
+                  pkt_dev->pkt_overhead;
 
         if (datalen < sizeof(struct pktgen_hdr)) {
                 datalen = sizeof(struct pktgen_hdr);
@@ -2738,8 +2741,7 @@ static struct sk_buff *fill_packet_ipv6(struct net_device *odev,
         ipv6_addr_copy(&iph->saddr, &pkt_dev->cur_in6_saddr);
 
         skb->mac_header = (skb->network_header - ETH_HLEN -
-                           pkt_dev->nr_labels * sizeof(u32) -
-                           VLAN_TAG_SIZE(pkt_dev) - SVLAN_TAG_SIZE(pkt_dev));
+                           pkt_dev->pkt_overhead);
         skb->protocol = protocol;
         skb->dev = odev;
         skb->pkt_type = PACKET_HOST;
@@ -2857,6 +2859,7 @@ static void pktgen_run(struct pktgen_thread *t)
                         pkt_dev->started_at = getCurUs();
                         pkt_dev->next_tx_us = getCurUs();       /* Transmit immediately */
                         pkt_dev->next_tx_ns = 0;
+                        set_pkt_overhead(pkt_dev);
 
                         strcpy(pkt_dev->result, "Starting");
                         started++;