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

Pull networking updates from David Miller:
 "Most notable changes in here:

   1) By far the biggest accomplishment, thanks to a large range of
      contributors, is the addition of multi-send for transmit.  This is
      the result of discussions back in Chicago, and the hard work of
      several individuals.

      Now, when the ->ndo_start_xmit() method of a driver sees
      skb->xmit_more as true, it can choose to defer the doorbell
      telling the driver to start processing the new TX queue entires.

      skb->xmit_more means that the generic networking is guaranteed to
      call the driver immediately with another SKB to send.

      There is logic added to the qdisc layer to dequeue multiple
      packets at a time, and the handling mis-predicted offloads in
      software is now done with no locks held.

      Finally, pktgen is extended to have a "burst" parameter that can
      be used to test a multi-send implementation.

      Several drivers have xmit_more support: i40e, igb, ixgbe, mlx4,
      virtio_net

      Adding support is almost trivial, so export more drivers to
      support this optimization soon.

      I want to thank, in no particular or implied order, Jesper
      Dangaard Brouer, Eric Dumazet, Alexander Duyck, Tom Herbert, Jamal
      Hadi Salim, John Fastabend, Florian Westphal, Daniel Borkmann,
      David Tat, Hannes Frederic Sowa, and Rusty Russell.

   2) PTP and timestamping support in bnx2x, from Michal Kalderon.

   3) Allow adjusting the rx_copybreak threshold for a driver via
      ethtool, and add rx_copybreak support to enic driver.  From
      Govindarajulu Varadarajan.

   4) Significant enhancements to the generic PHY layer and the bcm7xxx
      driver in particular (EEE support, auto power down, etc.) from
      Florian Fainelli.

   5) Allow raw buffers to be used for flow dissection, allowing drivers
      to determine the optimal "linear pull" size for devices that DMA
      into pools of pages.  The objective is to get exactly the
      necessary amount of headers into the linear SKB area pre-pulled,
      but no more.  The new interface drivers use is eth_get_headlen().
      From WANG Cong, with driver conversions (several had their own
      by-hand duplicated implementations) by Alexander Duyck and Eric
      Dumazet.

   6) Support checksumming more smoothly and efficiently for
      encapsulations, and add "foo over UDP" facility.  From Tom
      Herbert.

   7) Add Broadcom SF2 switch driver to DSA layer, from Florian
      Fainelli.

   8) eBPF now can load programs via a system call and has an extensive
      testsuite.  Alexei Starovoitov and Daniel Borkmann.

   9) Major overhaul of the packet scheduler to use RCU in several major
      areas such as the classifiers and rate estimators.  From John
      Fastabend.

  10) Add driver for Intel FM10000 Ethernet Switch, from Alexander
      Duyck.

  11) Rearrange TCP_SKB_CB() to reduce cache line misses, from Eric
      Dumazet.

  12) Add Datacenter TCP congestion control algorithm support, From
      Florian Westphal.

  13) Reorganize sk_buff so that __copy_skb_header() is significantly
      faster.  From Eric Dumazet"

* git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next: (1558 commits)
  netlabel: directly return netlbl_unlabel_genl_init()
  net: add netdev_txq_bql_{enqueue, complete}_prefetchw() helpers
  net: description of dma_cookie cause make xmldocs warning
  cxgb4: clean up a type issue
  cxgb4: potential shift wrapping bug
  i40e: skb->xmit_more support
  net: fs_enet: Add NAPI TX
  net: fs_enet: Remove non NAPI RX
  r8169:add support for RTL8168EP
  net_sched: copy exts->type in tcf_exts_change()
  wimax: convert printk to pr_foo()
  af_unix: remove 0 assignment on static
  ipv6: Do not warn for informational ICMP messages, regardless of type.
  Update Intel Ethernet Driver maintainers list
  bridge: Save frag_max_size between PRE_ROUTING and POST_ROUTING
  tipc: fix bug in multicast congestion handling
  net: better IFF_XMIT_DST_RELEASE support
  net/mlx4_en: remove NETDEV_TX_BUSY
  3c59x: fix bad split of cpu_to_le32(pci_map_single())
  net: bcmgenet: fix Tx ring priority programming
  ...

1 files changed, 463 insertions, 0 deletions

diff --git a/drivers/net/ethernet/intel/fm10k/fm10k_ptp.c b/drivers/net/ethernet/intel/fm10k/fm10k_ptp.c
new file mode 100644
index 000000000000..7822809436a3
--- /dev/null
+++ b/drivers/net/ethernet/intel/fm10k/fm10k_ptp.c
@@ -0,0 +1,463 @@
+/* Intel Ethernet Switch Host Interface Driver
+ * Copyright(c) 2013 - 2014 Intel Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * The full GNU General Public License is included in this distribution in
+ * the file called "COPYING".
+ *
+ * Contact Information:
+ * e1000-devel Mailing List <e1000-devel@lists.sourceforge.net>
+ * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
+ */
+
+#include <linux/ptp_classify.h>
+#include <linux/ptp_clock_kernel.h>
+
+#include "fm10k.h"
+
+#define FM10K_TS_TX_TIMEOUT		(HZ * 15)
+
+void fm10k_systime_to_hwtstamp(struct fm10k_intfc *interface,
+			       struct skb_shared_hwtstamps *hwtstamp,
+			       u64 systime)
+{
+	unsigned long flags;
+
+	read_lock_irqsave(&interface->systime_lock, flags);
+	systime += interface->ptp_adjust;
+	read_unlock_irqrestore(&interface->systime_lock, flags);
+
+	hwtstamp->hwtstamp = ns_to_ktime(systime);
+}
+
+static struct sk_buff *fm10k_ts_tx_skb(struct fm10k_intfc *interface,
+				       __le16 dglort)
+{
+	struct sk_buff_head *list = &interface->ts_tx_skb_queue;
+	struct sk_buff *skb;
+
+	skb_queue_walk(list, skb) {
+		if (FM10K_CB(skb)->fi.w.dglort == dglort)
+			return skb;
+	}
+
+	return NULL;
+}
+
+void fm10k_ts_tx_enqueue(struct fm10k_intfc *interface, struct sk_buff *skb)
+{
+	struct sk_buff_head *list = &interface->ts_tx_skb_queue;
+	struct sk_buff *clone;
+	unsigned long flags;
+	__le16 dglort;
+
+	/* create clone for us to return on the Tx path */
+	clone = skb_clone_sk(skb);
+	if (!clone)
+		return;
+
+	FM10K_CB(clone)->ts_tx_timeout = jiffies + FM10K_TS_TX_TIMEOUT;
+	dglort = FM10K_CB(clone)->fi.w.dglort;
+
+	spin_lock_irqsave(&list->lock, flags);
+
+	/* attempt to locate any buffers with the same dglort,
+	 * if none are present then insert skb in tail of list
+	 */
+	skb = fm10k_ts_tx_skb(interface, FM10K_CB(clone)->fi.w.dglort);
+	if (!skb)
+		__skb_queue_tail(list, clone);
+
+	spin_unlock_irqrestore(&list->lock, flags);
+
+	/* if list is already has one then we just free the clone */
+	if (skb)
+		kfree_skb(skb);
+	else
+		skb_shinfo(clone)->tx_flags |= SKBTX_IN_PROGRESS;
+}
+
+void fm10k_ts_tx_hwtstamp(struct fm10k_intfc *interface, __le16 dglort,
+			  u64 systime)
+{
+	struct skb_shared_hwtstamps shhwtstamps;
+	struct sk_buff_head *list = &interface->ts_tx_skb_queue;
+	struct sk_buff *skb;
+	unsigned long flags;
+
+	spin_lock_irqsave(&list->lock, flags);
+
+	/* attempt to locate and pull the sk_buff out of the list */
+	skb = fm10k_ts_tx_skb(interface, dglort);
+	if (skb)
+		__skb_unlink(skb, list);
+
+	spin_unlock_irqrestore(&list->lock, flags);
+
+	/* if not found do nothing */
+	if (!skb)
+		return;
+
+	/* timestamp the sk_buff and return it to the socket */
+	fm10k_systime_to_hwtstamp(interface, &shhwtstamps, systime);
+	skb_complete_tx_timestamp(skb, &shhwtstamps);
+}
+
+void fm10k_ts_tx_subtask(struct fm10k_intfc *interface)
+{
+	struct sk_buff_head *list = &interface->ts_tx_skb_queue;
+	struct sk_buff *skb, *tmp;
+	unsigned long flags;
+
+	/* If we're down or resetting, just bail */
+	if (test_bit(__FM10K_DOWN, &interface->state) ||
+	    test_bit(__FM10K_RESETTING, &interface->state))
+		return;
+
+	spin_lock_irqsave(&list->lock, flags);
+
+	/* walk though the list and flush any expired timestamp packets */
+	skb_queue_walk_safe(list, skb, tmp) {
+		if (!time_is_after_jiffies(FM10K_CB(skb)->ts_tx_timeout))
+			continue;
+		__skb_unlink(skb, list);
+		kfree_skb(skb);
+		interface->tx_hwtstamp_timeouts++;
+	}
+
+	spin_unlock_irqrestore(&list->lock, flags);
+}
+
+static u64 fm10k_systime_read(struct fm10k_intfc *interface)
+{
+	struct fm10k_hw *hw = &interface->hw;
+
+	return hw->mac.ops.read_systime(hw);
+}
+
+void fm10k_ts_reset(struct fm10k_intfc *interface)
+{
+	s64 ns = ktime_to_ns(ktime_get_real());
+	unsigned long flags;
+
+	/* reinitialize the clock */
+	write_lock_irqsave(&interface->systime_lock, flags);
+	interface->ptp_adjust = fm10k_systime_read(interface) - ns;
+	write_unlock_irqrestore(&interface->systime_lock, flags);
+}
+
+void fm10k_ts_init(struct fm10k_intfc *interface)
+{
+	/* Initialize lock protecting systime access */
+	rwlock_init(&interface->systime_lock);
+
+	/* Initialize skb queue for pending timestamp requests */
+	skb_queue_head_init(&interface->ts_tx_skb_queue);
+
+	/* reset the clock to current kernel time */
+	fm10k_ts_reset(interface);
+}
+
+/**
+ * fm10k_get_ts_config - get current hardware timestamping configuration
+ * @netdev: network interface device structure
+ * @ifreq: ioctl data
+ *
+ * This function returns the current timestamping settings. Rather than
+ * attempt to deconstruct registers to fill in the values, simply keep a copy
+ * of the old settings around, and return a copy when requested.
+ */
+int fm10k_get_ts_config(struct net_device *netdev, struct ifreq *ifr)
+{
+	struct fm10k_intfc *interface = netdev_priv(netdev);
+	struct hwtstamp_config *config = &interface->ts_config;
+
+	return copy_to_user(ifr->ifr_data, config, sizeof(*config)) ?
+		-EFAULT : 0;
+}
+
+/**
+ * fm10k_set_ts_config - control hardware time stamping
+ * @netdev: network interface device structure
+ * @ifreq: ioctl data
+ *
+ * Outgoing time stamping can be enabled and disabled. Play nice and
+ * disable it when requested, although it shouldn't cause any overhead
+ * when no packet needs it. At most one packet in the queue may be
+ * marked for time stamping, otherwise it would be impossible to tell
+ * for sure to which packet the hardware time stamp belongs.
+ *
+ * Incoming time stamping has to be configured via the hardware
+ * filters. Not all combinations are supported, in particular event
+ * type has to be specified. Matching the kind of event packet is
+ * not supported, with the exception of "all V2 events regardless of
+ * level 2 or 4".
+ *
+ * Since hardware always timestamps Path delay packets when timestamping V2
+ * packets, regardless of the type specified in the register, only use V2
+ * Event mode. This more accurately tells the user what the hardware is going
+ * to do anyways.
+ */
+int fm10k_set_ts_config(struct net_device *netdev, struct ifreq *ifr)
+{
+	struct fm10k_intfc *interface = netdev_priv(netdev);
+	struct hwtstamp_config ts_config;
+
+	if (copy_from_user(&ts_config, ifr->ifr_data, sizeof(ts_config)))
+		return -EFAULT;
+
+	/* reserved for future extensions */
+	if (ts_config.flags)
+		return -EINVAL;
+
+	switch (ts_config.tx_type) {
+	case HWTSTAMP_TX_OFF:
+		break;
+	case HWTSTAMP_TX_ON:
+		/* we likely need some check here to see if this is supported */
+		break;
+	default:
+		return -ERANGE;
+	}
+
+	switch (ts_config.rx_filter) {
+	case HWTSTAMP_FILTER_NONE:
+		interface->flags &= ~FM10K_FLAG_RX_TS_ENABLED;
+		break;
+	case HWTSTAMP_FILTER_PTP_V1_L4_EVENT:
+	case HWTSTAMP_FILTER_PTP_V1_L4_SYNC:
+	case HWTSTAMP_FILTER_PTP_V1_L4_DELAY_REQ:
+	case HWTSTAMP_FILTER_PTP_V2_L4_EVENT:
+	case HWTSTAMP_FILTER_PTP_V2_L4_SYNC:
+	case HWTSTAMP_FILTER_PTP_V2_L4_DELAY_REQ:
+	case HWTSTAMP_FILTER_PTP_V2_L2_EVENT:
+	case HWTSTAMP_FILTER_PTP_V2_L2_SYNC:
+	case HWTSTAMP_FILTER_PTP_V2_L2_DELAY_REQ:
+	case HWTSTAMP_FILTER_PTP_V2_EVENT:
+	case HWTSTAMP_FILTER_PTP_V2_SYNC:
+	case HWTSTAMP_FILTER_PTP_V2_DELAY_REQ:
+	case HWTSTAMP_FILTER_ALL:
+		interface->flags |= FM10K_FLAG_RX_TS_ENABLED;
+		ts_config.rx_filter = HWTSTAMP_FILTER_ALL;
+		break;
+	default:
+		return -ERANGE;
+	}
+
+	/* save these settings for future reference */
+	interface->ts_config = ts_config;
+
+	return copy_to_user(ifr->ifr_data, &ts_config, sizeof(ts_config)) ?
+		-EFAULT : 0;
+}
+
+static int fm10k_ptp_adjfreq(struct ptp_clock_info *ptp, s32 ppb)
+{
+	struct fm10k_intfc *interface;
+	struct fm10k_hw *hw;
+	int err;
+
+	interface = container_of(ptp, struct fm10k_intfc, ptp_caps);
+	hw = &interface->hw;
+
+	err = hw->mac.ops.adjust_systime(hw, ppb);
+
+	/* the only error we should see is if the value is out of range */
+	return (err == FM10K_ERR_PARAM) ? -ERANGE : err;
+}
+
+static int fm10k_ptp_adjtime(struct ptp_clock_info *ptp, s64 delta)
+{
+	struct fm10k_intfc *interface;
+	unsigned long flags;
+
+	interface = container_of(ptp, struct fm10k_intfc, ptp_caps);
+
+	write_lock_irqsave(&interface->systime_lock, flags);
+	interface->ptp_adjust += delta;
+	write_unlock_irqrestore(&interface->systime_lock, flags);
+
+	return 0;
+}
+
+static int fm10k_ptp_gettime(struct ptp_clock_info *ptp, struct timespec *ts)
+{
+	struct fm10k_intfc *interface;
+	unsigned long flags;
+	u64 now;
+
+	interface = container_of(ptp, struct fm10k_intfc, ptp_caps);
+
+	read_lock_irqsave(&interface->systime_lock, flags);
+	now = fm10k_systime_read(interface) + interface->ptp_adjust;
+	read_unlock_irqrestore(&interface->systime_lock, flags);
+
+	*ts = ns_to_timespec(now);
+
+	return 0;
+}
+
+static int fm10k_ptp_settime(struct ptp_clock_info *ptp,
+			     const struct timespec *ts)
+{
+	struct fm10k_intfc *interface;
+	unsigned long flags;
+	u64 ns = timespec_to_ns(ts);
+
+	interface = container_of(ptp, struct fm10k_intfc, ptp_caps);
+
+	write_lock_irqsave(&interface->systime_lock, flags);
+	interface->ptp_adjust = fm10k_systime_read(interface) - ns;
+	write_unlock_irqrestore(&interface->systime_lock, flags);
+
+	return 0;
+}
+
+static int fm10k_ptp_enable(struct ptp_clock_info *ptp,
+			    struct ptp_clock_request *rq, int on)
+{
+	struct ptp_clock_time *t = &rq->perout.period;
+	struct fm10k_intfc *interface;
+	struct fm10k_hw *hw;
+	u64 period;
+	u32 step;
+
+	/* we can only support periodic output */
+	if (rq->type != PTP_CLK_REQ_PEROUT)
+		return -EINVAL;
+
+	/* verify the requested channel is there */
+	if (rq->perout.index >= ptp->n_per_out)
+		return -EINVAL;
+
+	/* we cannot enforce start time as there is no
+	 * mechanism for that in the hardware, we can only control
+	 * the period.
+	 */
+
+	/* we cannot support periods greater than 4 seconds due to reg limit */
+	if (t->sec > 4 || t->sec < 0)
+		return -ERANGE;
+
+	interface = container_of(ptp, struct fm10k_intfc, ptp_caps);
+	hw = &interface->hw;
+
+	/* we simply cannot support the operation if we don't have BAR4 */
+	if (!hw->sw_addr)
+		return -ENOTSUPP;
+
+	/* convert to unsigned 64b ns, verify we can put it in a 32b register */
+	period = t->sec * 1000000000LL + t->nsec;
+
+	/* determine the minimum size for period */
+	step = 2 * (fm10k_read_reg(hw, FM10K_SYSTIME_CFG) &
+		    FM10K_SYSTIME_CFG_STEP_MASK);
+
+	/* verify the value is in range supported by hardware */
+	if ((period && (period < step)) || (period > U32_MAX))
+		return -ERANGE;
+
+	/* notify hardware of request to being sending pulses */
+	fm10k_write_sw_reg(hw, FM10K_SW_SYSTIME_PULSE(rq->perout.index),
+			   (u32)period);
+
+	return 0;
+}
+
+static struct ptp_pin_desc fm10k_ptp_pd[2] = {
+	{
+		.name = "IEEE1588_PULSE0",
+		.index = 0,
+		.func = PTP_PF_PEROUT,
+		.chan = 0
+	},
+	{
+		.name = "IEEE1588_PULSE1",
+		.index = 1,
+		.func = PTP_PF_PEROUT,
+		.chan = 1
+	}
+};
+
+static int fm10k_ptp_verify(struct ptp_clock_info *ptp, unsigned int pin,
+			    enum ptp_pin_function func, unsigned int chan)
+{
+	/* verify the requested pin is there */
+	if (pin >= ptp->n_pins || !ptp->pin_config)
+		return -EINVAL;
+
+	/* enforce locked channels, no changing them */
+	if (chan != ptp->pin_config[pin].chan)
+		return -EINVAL;
+
+	/* we want to keep the functions locked as well */
+	if (func != ptp->pin_config[pin].func)
+		return -EINVAL;
+
+	return 0;
+}
+
+void fm10k_ptp_register(struct fm10k_intfc *interface)
+{
+	struct ptp_clock_info *ptp_caps = &interface->ptp_caps;
+	struct device *dev = &interface->pdev->dev;
+	struct ptp_clock *ptp_clock;
+
+	snprintf(ptp_caps->name, sizeof(ptp_caps->name),
+		 "%s", interface->netdev->name);
+	ptp_caps->owner		= THIS_MODULE;
+	/* This math is simply the inverse of the math in
+	 * fm10k_adjust_systime_pf applied to an adjustment value
+	 * of 2^30 - 1 which is the maximum value of the register:
+	 * 	max_ppb == ((2^30 - 1) * 5^9) / 2^31
+	 */
+	ptp_caps->max_adj	= 976562;
+	ptp_caps->adjfreq	= fm10k_ptp_adjfreq;
+	ptp_caps->adjtime	= fm10k_ptp_adjtime;
+	ptp_caps->gettime	= fm10k_ptp_gettime;
+	ptp_caps->settime	= fm10k_ptp_settime;
+
+	/* provide pins if BAR4 is accessible */
+	if (interface->sw_addr) {
+		/* enable periodic outputs */
+		ptp_caps->n_per_out = 2;
+		ptp_caps->enable	= fm10k_ptp_enable;
+
+		/* enable clock pins */
+		ptp_caps->verify	= fm10k_ptp_verify;
+		ptp_caps->n_pins = 2;
+		ptp_caps->pin_config = fm10k_ptp_pd;
+	}
+
+	ptp_clock = ptp_clock_register(ptp_caps, dev);
+	if (IS_ERR(ptp_clock)) {
+		ptp_clock = NULL;
+		dev_err(dev, "ptp_clock_register failed\n");
+	} else {
+		dev_info(dev, "registered PHC device %s\n", ptp_caps->name);
+	}
+
+	interface->ptp_clock = ptp_clock;
+}
+
+void fm10k_ptp_unregister(struct fm10k_intfc *interface)
+{
+	struct ptp_clock *ptp_clock = interface->ptp_clock;
+	struct device *dev = &interface->pdev->dev;
+
+	if (!ptp_clock)
+		return;
+
+	interface->ptp_clock = NULL;
+
+	ptp_clock_unregister(ptp_clock);
+	dev_info(dev, "removed PHC %s\n", interface->ptp_caps.name);
+}