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

Pull networking updates from David Miller:
 "This is a re-do of the net-next pull request for the current merge
  window.  The only difference from the one I made the other day is that
  this has Eliezer's interface renames and the timeout handling changes
  made based upon your feedback, as well as a few bug fixes that have
  trickeled in.

  Highlights:

   1) Low latency device polling, eliminating the cost of interrupt
      handling and context switches.  Allows direct polling of a network
      device from socket operations, such as recvmsg() and poll().

      Currently ixgbe, mlx4, and bnx2x support this feature.

      Full high level description, performance numbers, and design in
      commit 0a4db187a999 ("Merge branch 'll_poll'")

      From Eliezer Tamir.

   2) With the routing cache removed, ip_check_mc_rcu() gets exercised
      more than ever before in the case where we have lots of multicast
      addresses.  Use a hash table instead of a simple linked list, from
      Eric Dumazet.

   3) Add driver for Atheros CQA98xx 802.11ac wireless devices, from
      Bartosz Markowski, Janusz Dziedzic, Kalle Valo, Marek Kwaczynski,
      Marek Puzyniak, Michal Kazior, and Sujith Manoharan.

   4) Support reporting the TUN device persist flag to userspace, from
      Pavel Emelyanov.

   5) Allow controlling network device VF link state using netlink, from
      Rony Efraim.

   6) Support GRE tunneling in openvswitch, from Pravin B Shelar.

   7) Adjust SOCK_MIN_RCVBUF and SOCK_MIN_SNDBUF for modern times, from
      Daniel Borkmann and Eric Dumazet.

   8) Allow controlling of TCP quickack behavior on a per-route basis,
      from Cong Wang.

   9) Several bug fixes and improvements to vxlan from Stephen
      Hemminger, Pravin B Shelar, and Mike Rapoport.  In particular,
      support receiving on multiple UDP ports.

  10) Major cleanups, particular in the area of debugging and cookie
      lifetime handline, to the SCTP protocol code.  From Daniel
      Borkmann.

  11) Allow packets to cross network namespaces when traversing tunnel
      devices.  From Nicolas Dichtel.

  12) Allow monitoring netlink traffic via AF_PACKET sockets, in a
      manner akin to how we monitor real network traffic via ptype_all.
      From Daniel Borkmann.

  13) Several bug fixes and improvements for the new alx device driver,
      from Johannes Berg.

  14) Fix scalability issues in the netem packet scheduler's time queue,
      by using an rbtree.  From Eric Dumazet.

  15) Several bug fixes in TCP loss recovery handling, from Yuchung
      Cheng.

  16) Add support for GSO segmentation of MPLS packets, from Simon
      Horman.

  17) Make network notifiers have a real data type for the opaque
      pointer that's passed into them.  Use this to properly handle
      network device flag changes in arp_netdev_event().  From Jiri
      Pirko and Timo Teräs.

  18) Convert several drivers over to module_pci_driver(), from Peter
      Huewe.

  19) tcp_fixup_rcvbuf() can loop 500 times over loopback, just use a
      O(1) calculation instead.  From Eric Dumazet.

  20) Support setting of explicit tunnel peer addresses in ipv6, just
      like ipv4.  From Nicolas Dichtel.

  21) Protect x86 BPF JIT against spraying attacks, from Eric Dumazet.

  22) Prevent a single high rate flow from overruning an individual cpu
      during RX packet processing via selective flow shedding.  From
      Willem de Bruijn.

  23) Don't use spinlocks in TCP md5 signing fast paths, from Eric
      Dumazet.

  24) Don't just drop GSO packets which are above the TBF scheduler's
      burst limit, chop them up so they are in-bounds instead.  Also
      from Eric Dumazet.

  25) VLAN offloads are missed when configured on top of a bridge, fix
      from Vlad Yasevich.

  26) Support IPV6 in ping sockets.  From Lorenzo Colitti.

  27) Receive flow steering targets should be updated at poll() time
      too, from David Majnemer.

  28) Fix several corner case regressions in PMTU/redirect handling due
      to the routing cache removal, from Timo Teräs.

  29) We have to be mindful of ipv4 mapped ipv6 sockets in
      upd_v6_push_pending_frames().  From Hannes Frederic Sowa.

  30) Fix L2TP sequence number handling bugs, from James Chapman."

* git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next: (1214 commits)
  drivers/net: caif: fix wrong rtnl_is_locked() usage
  drivers/net: enic: release rtnl_lock on error-path
  vhost-net: fix use-after-free in vhost_net_flush
  net: mv643xx_eth: do not use port number as platform device id
  net: sctp: confirm route during forward progress
  virtio_net: fix race in RX VQ processing
  virtio: support unlocked queue poll
  net/cadence/macb: fix bug/typo in extracting gem_irq_read_clear bit
  Documentation: Fix references to defunct linux-net@vger.kernel.org
  net/fs: change busy poll time accounting
  net: rename low latency sockets functions to busy poll
  bridge: fix some kernel warning in multicast timer
  sfc: Fix memory leak when discarding scattered packets
  sit: fix tunnel update via netlink
  dt:net:stmmac: Add dt specific phy reset callback support.
  dt:net:stmmac: Add support to dwmac version 3.610 and 3.710
  dt:net:stmmac: Allocate platform data only if its NULL.
  net:stmmac: fix memleak in the open method
  ipv6: rt6_check_neigh should successfully verify neigh if no NUD information are available
  net: ipv6: fix wrong ping_v6_sendmsg return value
  ...

1 files changed, 57 insertions, 58 deletions

diff --git a/drivers/net/wireless/iwlwifi/pcie/rx.c b/drivers/net/wireless/iwlwifi/pcie/rx.c
index 567e67ad1f61..fd848cd1583e 100644
--- a/drivers/net/wireless/iwlwifi/pcie/rx.c
+++ b/drivers/net/wireless/iwlwifi/pcie/rx.c
@@ -110,9 +110,10 @@
 /*
  * iwl_rxq_space - Return number of free slots available in queue.
  */
-static int iwl_rxq_space(const struct iwl_rxq *q)
+static int iwl_rxq_space(const struct iwl_rxq *rxq)
 {
-	int s = q->read - q->write;
+	int s = rxq->read - rxq->write;
+
 	if (s <= 0)
 		s += RX_QUEUE_SIZE;
 	/* keep some buffer to not confuse full and empty queue */
@@ -143,21 +144,22 @@ int iwl_pcie_rx_stop(struct iwl_trans *trans)
 /*
  * iwl_pcie_rxq_inc_wr_ptr - Update the write pointer for the RX queue
  */
-static void iwl_pcie_rxq_inc_wr_ptr(struct iwl_trans *trans, struct iwl_rxq *q)
+static void iwl_pcie_rxq_inc_wr_ptr(struct iwl_trans *trans,
+				    struct iwl_rxq *rxq)
 {
 	unsigned long flags;
 	u32 reg;
 
-	spin_lock_irqsave(&q->lock, flags);
+	spin_lock_irqsave(&rxq->lock, flags);
 
-	if (q->need_update == 0)
+	if (rxq->need_update == 0)
 		goto exit_unlock;
 
 	if (trans->cfg->base_params->shadow_reg_enable) {
 		/* shadow register enabled */
 		/* Device expects a multiple of 8 */
-		q->write_actual = (q->write & ~0x7);
-		iwl_write32(trans, FH_RSCSR_CHNL0_WPTR, q->write_actual);
+		rxq->write_actual = (rxq->write & ~0x7);
+		iwl_write32(trans, FH_RSCSR_CHNL0_WPTR, rxq->write_actual);
 	} else {
 		struct iwl_trans_pcie *trans_pcie =
 			IWL_TRANS_GET_PCIE_TRANS(trans);
@@ -175,22 +177,22 @@ static void iwl_pcie_rxq_inc_wr_ptr(struct iwl_trans *trans, struct iwl_rxq *q)
 				goto exit_unlock;
 			}
 
-			q->write_actual = (q->write & ~0x7);
+			rxq->write_actual = (rxq->write & ~0x7);
 			iwl_write_direct32(trans, FH_RSCSR_CHNL0_WPTR,
-					q->write_actual);
+					   rxq->write_actual);
 
 		/* Else device is assumed to be awake */
 		} else {
 			/* Device expects a multiple of 8 */
-			q->write_actual = (q->write & ~0x7);
+			rxq->write_actual = (rxq->write & ~0x7);
 			iwl_write_direct32(trans, FH_RSCSR_CHNL0_WPTR,
-				q->write_actual);
+					   rxq->write_actual);
 		}
 	}
-	q->need_update = 0;
+	rxq->need_update = 0;
 
  exit_unlock:
-	spin_unlock_irqrestore(&q->lock, flags);
+	spin_unlock_irqrestore(&rxq->lock, flags);
 }
 
 /*
@@ -355,19 +357,16 @@ static void iwl_pcie_rxq_free_rbs(struct iwl_trans *trans)
 	struct iwl_rxq *rxq = &trans_pcie->rxq;
 	int i;
 
-	/* Fill the rx_used queue with _all_ of the Rx buffers */
+	lockdep_assert_held(&rxq->lock);
+
 	for (i = 0; i < RX_FREE_BUFFERS + RX_QUEUE_SIZE; i++) {
-		/* In the reset function, these buffers may have been allocated
-		 * to an SKB, so we need to unmap and free potential storage */
-		if (rxq->pool[i].page != NULL) {
-			dma_unmap_page(trans->dev, rxq->pool[i].page_dma,
-				       PAGE_SIZE << trans_pcie->rx_page_order,
-				       DMA_FROM_DEVICE);
-			__free_pages(rxq->pool[i].page,
-				     trans_pcie->rx_page_order);
-			rxq->pool[i].page = NULL;
-		}
-		list_add_tail(&rxq->pool[i].list, &rxq->rx_used);
+		if (!rxq->pool[i].page)
+			continue;
+		dma_unmap_page(trans->dev, rxq->pool[i].page_dma,
+			       PAGE_SIZE << trans_pcie->rx_page_order,
+			       DMA_FROM_DEVICE);
+		__free_pages(rxq->pool[i].page, trans_pcie->rx_page_order);
+		rxq->pool[i].page = NULL;
 	}
 }
 
@@ -491,6 +490,20 @@ static void iwl_pcie_rx_hw_init(struct iwl_trans *trans, struct iwl_rxq *rxq)
 	iwl_write8(trans, CSR_INT_COALESCING, IWL_HOST_INT_TIMEOUT_DEF);
 }
 
+static void iwl_pcie_rx_init_rxb_lists(struct iwl_rxq *rxq)
+{
+	int i;
+
+	lockdep_assert_held(&rxq->lock);
+
+	INIT_LIST_HEAD(&rxq->rx_free);
+	INIT_LIST_HEAD(&rxq->rx_used);
+	rxq->free_count = 0;
+
+	for (i = 0; i < RX_FREE_BUFFERS + RX_QUEUE_SIZE; i++)
+		list_add(&rxq->pool[i].list, &rxq->rx_used);
+}
+
 int iwl_pcie_rx_init(struct iwl_trans *trans)
 {
 	struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
@@ -505,13 +518,12 @@ int iwl_pcie_rx_init(struct iwl_trans *trans)
 	}
 
 	spin_lock_irqsave(&rxq->lock, flags);
-	INIT_LIST_HEAD(&rxq->rx_free);
-	INIT_LIST_HEAD(&rxq->rx_used);
 
-	INIT_WORK(&trans_pcie->rx_replenish,
-		  iwl_pcie_rx_replenish_work);
+	INIT_WORK(&trans_pcie->rx_replenish, iwl_pcie_rx_replenish_work);
 
+	/* free all first - we might be reconfigured for a different size */
 	iwl_pcie_rxq_free_rbs(trans);
+	iwl_pcie_rx_init_rxb_lists(rxq);
 
 	for (i = 0; i < RX_QUEUE_SIZE; i++)
 		rxq->queue[i] = NULL;
@@ -520,7 +532,6 @@ int iwl_pcie_rx_init(struct iwl_trans *trans)
 	 * not restocked the Rx queue with fresh buffers */
 	rxq->read = rxq->write = 0;
 	rxq->write_actual = 0;
-	rxq->free_count = 0;
 	memset(rxq->rb_stts, 0, sizeof(*rxq->rb_stts));
 	spin_unlock_irqrestore(&rxq->lock, flags);
 
@@ -802,9 +813,6 @@ irqreturn_t iwl_pcie_irq_handler(int irq, void *dev_id)
 	u32 handled = 0;
 	unsigned long flags;
 	u32 i;
-#ifdef CONFIG_IWLWIFI_DEBUG
-	u32 inta_mask;
-#endif
 
 	lock_map_acquire(&trans->sync_cmd_lockdep_map);
 
@@ -826,14 +834,9 @@ irqreturn_t iwl_pcie_irq_handler(int irq, void *dev_id)
 
 	inta = trans_pcie->inta;
 
-#ifdef CONFIG_IWLWIFI_DEBUG
-	if (iwl_have_debug_level(IWL_DL_ISR)) {
-		/* just for debug */
-		inta_mask = iwl_read32(trans, CSR_INT_MASK);
+	if (iwl_have_debug_level(IWL_DL_ISR))
 		IWL_DEBUG_ISR(trans, "inta 0x%08x, enabled 0x%08x\n",
-			      inta, inta_mask);
-	}
-#endif
+			      inta, iwl_read32(trans, CSR_INT_MASK));
 
 	/* saved interrupt in inta variable now we can reset trans_pcie->inta */
 	trans_pcie->inta = 0;
@@ -855,12 +858,11 @@ irqreturn_t iwl_pcie_irq_handler(int irq, void *dev_id)
 		goto out;
 	}
 
-#ifdef CONFIG_IWLWIFI_DEBUG
 	if (iwl_have_debug_level(IWL_DL_ISR)) {
 		/* NIC fires this, but we don't use it, redundant with WAKEUP */
 		if (inta & CSR_INT_BIT_SCD) {
-			IWL_DEBUG_ISR(trans, "Scheduler finished to transmit "
-				      "the frame/frames.\n");
+			IWL_DEBUG_ISR(trans,
+				      "Scheduler finished to transmit the frame/frames.\n");
 			isr_stats->sch++;
 		}
 
@@ -870,7 +872,7 @@ irqreturn_t iwl_pcie_irq_handler(int irq, void *dev_id)
 			isr_stats->alive++;
 		}
 	}
-#endif
+
 	/* Safely ignore these bits for debug checks below */
 	inta &= ~(CSR_INT_BIT_SCD | CSR_INT_BIT_ALIVE);
 
@@ -1118,9 +1120,6 @@ static irqreturn_t iwl_pcie_isr(int irq, void *data)
 	struct iwl_trans *trans = data;
 	struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
 	u32 inta, inta_mask;
-#ifdef CONFIG_IWLWIFI_DEBUG
-	u32 inta_fh;
-#endif
 
 	lockdep_assert_held(&trans_pcie->irq_lock);
 
@@ -1159,13 +1158,11 @@ static irqreturn_t iwl_pcie_isr(int irq, void *data)
 		return IRQ_HANDLED;
 	}
 
-#ifdef CONFIG_IWLWIFI_DEBUG
-	if (iwl_have_debug_level(IWL_DL_ISR)) {
-		inta_fh = iwl_read32(trans, CSR_FH_INT_STATUS);
-		IWL_DEBUG_ISR(trans, "ISR inta 0x%08x, enabled 0x%08x, "
-			      "fh 0x%08x\n", inta, inta_mask, inta_fh);
-	}
-#endif
+	if (iwl_have_debug_level(IWL_DL_ISR))
+		IWL_DEBUG_ISR(trans,
+			      "ISR inta 0x%08x, enabled 0x%08x, fh 0x%08x\n",
+			      inta, inta_mask,
+			      iwl_read32(trans, CSR_FH_INT_STATUS));
 
 	trans_pcie->inta |= inta;
 	/* the thread will service interrupts and re-enable them */
@@ -1198,7 +1195,7 @@ irqreturn_t iwl_pcie_isr_ict(int irq, void *data)
 {
 	struct iwl_trans *trans = data;
 	struct iwl_trans_pcie *trans_pcie;
-	u32 inta, inta_mask;
+	u32 inta;
 	u32 val = 0;
 	u32 read;
 	unsigned long flags;
@@ -1226,7 +1223,6 @@ irqreturn_t iwl_pcie_isr_ict(int irq, void *data)
 	 * If we have something to service, the tasklet will re-enable ints.
 	 * If we *don't* have something, we'll re-enable before leaving here.
 	 */
-	inta_mask = iwl_read32(trans, CSR_INT_MASK);
 	iwl_write32(trans, CSR_INT_MASK, 0x00000000);
 
 	/* Ignore interrupt if there's nothing in NIC to service.
@@ -1271,8 +1267,11 @@ irqreturn_t iwl_pcie_isr_ict(int irq, void *data)
 		val |= 0x8000;
 
 	inta = (0xff & val) | ((0xff00 & val) << 16);
-	IWL_DEBUG_ISR(trans, "ISR inta 0x%08x, enabled 0x%08x ict 0x%08x\n",
-		      inta, inta_mask, val);
+	IWL_DEBUG_ISR(trans, "ISR inta 0x%08x, enabled(sw) 0x%08x ict 0x%08x\n",
+		      inta, trans_pcie->inta_mask, val);
+	if (iwl_have_debug_level(IWL_DL_ISR))
+		IWL_DEBUG_ISR(trans, "enabled(hw) 0x%08x\n",
+			      iwl_read32(trans, CSR_INT_MASK));
 
 	inta &= trans_pcie->inta_mask;
 	trans_pcie->inta |= inta;