Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next

Pull networking updates from David Miller:

 1) Add TX fast path in mac80211, from Johannes Berg.

 2) Add TSO/GRO support to ibmveth, from Thomas Falcon

 3) Move away from cached routes in ipv6, just like ipv4, from Martin
    KaFai Lau.

 4) Lots of new rhashtable tests, from Thomas Graf.

 5) Run ingress qdisc lockless, from Alexei Starovoitov.

 6) Allow servers to fetch TCP packet headers for SYN packets of new
    connections, for fingerprinting.  From Eric Dumazet.

 7) Add mode parameter to pktgen, for testing receive.  From Alexei
    Starovoitov.

 8) Cache access optimizations via simplifications of build_skb(), from
    Alexander Duyck.

 9) Move page frag allocator under mm/, also from Alexander.

10) Add xmit_more support to hv_netvsc, from KY Srinivasan.

11) Add a counter guard in case we try to perform endless reclassify
    loops in the packet scheduler.

12) Extern flow dissector to be programmable and use it in new "Flower"
    classifier.  From Jiri Pirko.

13) AF_PACKET fanout rollover fixes, performance improvements, and new
    statistics.  From Willem de Bruijn.

14) Add netdev driver for GENEVE tunnels, from John W Linville.

15) Add ingress netfilter hooks and filtering, from Pablo Neira Ayuso.

16) Fix handling of epoll edge triggers in TCP, from Eric Dumazet.

17) Add an ECN retry fallback for the initial TCP handshake, from Daniel
    Borkmann.

18) Add tail call support to BPF, from Alexei Starovoitov.

19) Add several pktgen helper scripts, from Jesper Dangaard Brouer.

20) Add zerocopy support to AF_UNIX, from Hannes Frederic Sowa.

21) Favor even port numbers for allocation to connect() requests, and
    odd port numbers for bind(0), in an effort to help avoid
    ip_local_port_range exhaustion.  From Eric Dumazet.

22) Add Cavium ThunderX driver, from Sunil Goutham.

23) Allow bpf programs to access skb_iif and dev->ifindex SKB metadata,
    from Alexei Starovoitov.

24) Add support for T6 chips in cxgb4vf driver, from Hariprasad Shenai.

25) Double TCP Small Queues default to 256K to accomodate situations
    like the XEN driver and wireless aggregation.  From Wei Liu.

26) Add more entropy inputs to flow dissector, from Tom Herbert.

27) Add CDG congestion control algorithm to TCP, from Kenneth Klette
    Jonassen.

28) Convert ipset over to RCU locking, from Jozsef Kadlecsik.

29) Track and act upon link status of ipv4 route nexthops, from Andy
    Gospodarek.

* git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next: (1670 commits)
  bridge: vlan: flush the dynamically learned entries on port vlan delete
  bridge: multicast: add a comment to br_port_state_selection about blocking state
  net: inet_diag: export IPV6_V6ONLY sockopt
  stmmac: troubleshoot unexpected bits in des0 & des1
  net: ipv4 sysctl option to ignore routes when nexthop link is down
  net: track link-status of ipv4 nexthops
  net: switchdev: ignore unsupported bridge flags
  net: Cavium: Fix MAC address setting in shutdown state
  drivers: net: xgene: fix for ACPI support without ACPI
  ip: report the original address of ICMP messages
  net/mlx5e: Prefetch skb data on RX
  net/mlx5e: Pop cq outside mlx5e_get_cqe
  net/mlx5e: Remove mlx5e_cq.sqrq back-pointer
  net/mlx5e: Remove extra spaces
  net/mlx5e: Avoid TX CQE generation if more xmit packets expected
  net/mlx5e: Avoid redundant dev_kfree_skb() upon NOP completion
  net/mlx5e: Remove re-assignment of wq type in mlx5e_enable_rq()
  net/mlx5e: Use skb_shinfo(skb)->gso_segs rather than counting them
  net/mlx5e: Static mapping of netdev priv resources to/from netdev TX queues
  net/mlx4_en: Use HW counters for rx/tx bytes/packets in PF device
  ...

1 files changed, 97 insertions, 13 deletions

diff --git a/net/core/pktgen.c b/net/core/pktgen.c
index 54817d365366..05badbb58865 100644
--- a/net/core/pktgen.c
+++ b/net/core/pktgen.c
@@ -177,7 +177,7 @@
 #include <asm/dma.h>
 #include <asm/div64.h>		/* do_div */
 
-#define VERSION	"2.74"
+#define VERSION	"2.75"
 #define IP_NAME_SZ 32
 #define MAX_MPLS_LABELS 16 /* This is the max label stack depth */
 #define MPLS_STACK_BOTTOM htonl(0x00000100)
@@ -210,6 +210,10 @@
 #define T_REMDEVALL   (1<<2)	/* Remove all devs */
 #define T_REMDEV      (1<<3)	/* Remove one dev */
 
+/* Xmit modes */
+#define M_START_XMIT		0	/* Default normal TX */
+#define M_NETIF_RECEIVE 	1	/* Inject packets into stack */
+
 /* If lock -- protects updating of if_list */
 #define   if_lock(t)           spin_lock(&(t->if_lock));
 #define   if_unlock(t)           spin_unlock(&(t->if_lock));
@@ -251,13 +255,14 @@ struct pktgen_dev {
 	 * we will do a random selection from within the range.
 	 */
 	__u32 flags;
-	int removal_mark;	/* non-zero => the device is marked for
-				 * removal by worker thread */
-
+	int xmit_mode;
 	int min_pkt_size;
 	int max_pkt_size;
 	int pkt_overhead;	/* overhead for MPLS, VLANs, IPSEC etc */
 	int nfrags;
+	int removal_mark;	/* non-zero => the device is marked for
+				 * removal by worker thread */
+
 	struct page *page;
 	u64 delay;		/* nano-seconds */
 
@@ -507,7 +512,7 @@ static ssize_t pgctrl_write(struct file *file, const char __user *buf,
 		pktgen_reset_all_threads(pn);
 
 	else
-		pr_warn("Unknown command: %s\n", data);
+		return -EINVAL;
 
 	return count;
 }
@@ -567,7 +572,7 @@ static int pktgen_if_show(struct seq_file *seq, void *v)
 			   "     dst_min: %s  dst_max: %s\n",
 			   pkt_dev->dst_min, pkt_dev->dst_max);
 		seq_printf(seq,
-			   "        src_min: %s  src_max: %s\n",
+			   "     src_min: %s  src_max: %s\n",
 			   pkt_dev->src_min, pkt_dev->src_max);
 	}
 
@@ -620,6 +625,9 @@ static int pktgen_if_show(struct seq_file *seq, void *v)
 	if (pkt_dev->node >= 0)
 		seq_printf(seq, "     node: %d\n", pkt_dev->node);
 
+	if (pkt_dev->xmit_mode == M_NETIF_RECEIVE)
+		seq_puts(seq, "     xmit_mode: netif_receive\n");
+
 	seq_puts(seq, "     Flags: ");
 
 	if (pkt_dev->flags & F_IPV6)
@@ -1081,7 +1089,8 @@ static ssize_t pktgen_if_write(struct file *file,
 		if (len < 0)
 			return len;
 		if ((value > 0) &&
-		    (!(pkt_dev->odev->priv_flags & IFF_TX_SKB_SHARING)))
+		    ((pkt_dev->xmit_mode == M_NETIF_RECEIVE) ||
+		     !(pkt_dev->odev->priv_flags & IFF_TX_SKB_SHARING)))
 			return -ENOTSUPP;
 		i += len;
 		pkt_dev->clone_skb = value;
@@ -1134,7 +1143,7 @@ static ssize_t pktgen_if_write(struct file *file,
 			return len;
 
 		i += len;
-		if ((value > 1) &&
+		if ((value > 1) && (pkt_dev->xmit_mode == M_START_XMIT) &&
 		    (!(pkt_dev->odev->priv_flags & IFF_TX_SKB_SHARING)))
 			return -ENOTSUPP;
 		pkt_dev->burst = value < 1 ? 1 : value;
@@ -1160,6 +1169,45 @@ static ssize_t pktgen_if_write(struct file *file,
 			sprintf(pg_result, "ERROR: node not possible");
 		return count;
 	}
+	if (!strcmp(name, "xmit_mode")) {
+		char f[32];
+
+		memset(f, 0, 32);
+		len = strn_len(&user_buffer[i], sizeof(f) - 1);
+		if (len < 0)
+			return len;
+
+		if (copy_from_user(f, &user_buffer[i], len))
+			return -EFAULT;
+		i += len;
+
+		if (strcmp(f, "start_xmit") == 0) {
+			pkt_dev->xmit_mode = M_START_XMIT;
+		} else if (strcmp(f, "netif_receive") == 0) {
+			/* clone_skb set earlier, not supported in this mode */
+			if (pkt_dev->clone_skb > 0)
+				return -ENOTSUPP;
+
+			pkt_dev->xmit_mode = M_NETIF_RECEIVE;
+
+			/* make sure new packet is allocated every time
+			 * pktgen_xmit() is called
+			 */
+			pkt_dev->last_ok = 1;
+
+			/* override clone_skb if user passed default value
+			 * at module loading time
+			 */
+			pkt_dev->clone_skb = 0;
+		} else {
+			sprintf(pg_result,
+				"xmit_mode -:%s:- unknown\nAvailable modes: %s",
+				f, "start_xmit, netif_receive\n");
+			return count;
+		}
+		sprintf(pg_result, "OK: xmit_mode=%s", f);
+		return count;
+	}
 	if (!strcmp(name, "flag")) {
 		char f[32];
 		memset(f, 0, 32);
@@ -1267,6 +1315,9 @@ static ssize_t pktgen_if_write(struct file *file,
 		else if (strcmp(f, "NO_TIMESTAMP") == 0)
 			pkt_dev->flags |= F_NO_TIMESTAMP;
 
+		else if (strcmp(f, "!NO_TIMESTAMP") == 0)
+			pkt_dev->flags &= ~F_NO_TIMESTAMP;
+
 		else {
 			sprintf(pg_result,
 				"Flag -:%s:- unknown\nAvailable flags, (prepend ! to un-set flag):\n%s",
@@ -2592,9 +2643,9 @@ static int process_ipsec(struct pktgen_dev *pkt_dev,
 		struct xfrm_state *x = pkt_dev->flows[pkt_dev->curfl].x;
 		int nhead = 0;
 		if (x) {
-			int ret;
-			__u8 *eth;
+			struct ethhdr *eth;
 			struct iphdr *iph;
+			int ret;
 
 			nhead = x->props.header_len - skb_headroom(skb);
 			if (nhead > 0) {
@@ -2614,9 +2665,9 @@ static int process_ipsec(struct pktgen_dev *pkt_dev,
 				goto err;
 			}
 			/* restore ll */
-			eth = (__u8 *) skb_push(skb, ETH_HLEN);
-			memcpy(eth, pkt_dev->hh, 12);
-			*(u16 *) &eth[12] = protocol;
+			eth = (struct ethhdr *)skb_push(skb, ETH_HLEN);
+			memcpy(eth, pkt_dev->hh, 2 * ETH_ALEN);
+			eth->h_proto = protocol;
 
 			/* Update IPv4 header len as well as checksum value */
 			iph = ip_hdr(skb);
@@ -3315,6 +3366,7 @@ static void pktgen_xmit(struct pktgen_dev *pkt_dev)
 	unsigned int burst = ACCESS_ONCE(pkt_dev->burst);
 	struct net_device *odev = pkt_dev->odev;
 	struct netdev_queue *txq;
+	struct sk_buff *skb;
 	int ret;
 
 	/* If device is offline, then don't send */
@@ -3352,6 +3404,37 @@ static void pktgen_xmit(struct pktgen_dev *pkt_dev)
 	if (pkt_dev->delay && pkt_dev->last_ok)
 		spin(pkt_dev, pkt_dev->next_tx);
 
+	if (pkt_dev->xmit_mode == M_NETIF_RECEIVE) {
+		skb = pkt_dev->skb;
+		skb->protocol = eth_type_trans(skb, skb->dev);
+		atomic_add(burst, &skb->users);
+		local_bh_disable();
+		do {
+			ret = netif_receive_skb(skb);
+			if (ret == NET_RX_DROP)
+				pkt_dev->errors++;
+			pkt_dev->sofar++;
+			pkt_dev->seq_num++;
+			if (atomic_read(&skb->users) != burst) {
+				/* skb was queued by rps/rfs or taps,
+				 * so cannot reuse this skb
+				 */
+				atomic_sub(burst - 1, &skb->users);
+				/* get out of the loop and wait
+				 * until skb is consumed
+				 */
+				break;
+			}
+			/* skb was 'freed' by stack, so clean few
+			 * bits and reuse it
+			 */
+#ifdef CONFIG_NET_CLS_ACT
+			skb->tc_verd = 0; /* reset reclass/redir ttl */
+#endif
+		} while (--burst > 0);
+		goto out; /* Skips xmit_mode M_START_XMIT */
+	}
+
 	txq = skb_get_tx_queue(odev, pkt_dev->skb);
 
 	local_bh_disable();
@@ -3399,6 +3482,7 @@ xmit_more:
 unlock:
 	HARD_TX_UNLOCK(odev, txq);
 
+out:
 	local_bh_enable();
 
 	/* If pkt_dev->count is zero, then run forever */