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, 378 insertions, 0 deletions

diff --git a/net/nfc/nci/spi.c b/net/nfc/nci/spi.c
new file mode 100644
index 000000000000..c7cf37ba7298
--- /dev/null
+++ b/net/nfc/nci/spi.c
@@ -0,0 +1,378 @@
+/*
+ * Copyright (C) 2013  Intel Corporation. All rights reserved.
+ *
+ * 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.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ */
+
+#define pr_fmt(fmt) "nci_spi: %s: " fmt, __func__
+
+#include <linux/export.h>
+#include <linux/spi/spi.h>
+#include <linux/crc-ccitt.h>
+#include <linux/nfc.h>
+#include <net/nfc/nci_core.h>
+
+#define NCI_SPI_HDR_LEN			4
+#define NCI_SPI_CRC_LEN			2
+#define NCI_SPI_ACK_SHIFT		6
+#define NCI_SPI_MSB_PAYLOAD_MASK	0x3F
+
+#define NCI_SPI_SEND_TIMEOUT	(NCI_CMD_TIMEOUT > NCI_DATA_TIMEOUT ? \
+					NCI_CMD_TIMEOUT : NCI_DATA_TIMEOUT)
+
+#define NCI_SPI_DIRECT_WRITE	0x01
+#define NCI_SPI_DIRECT_READ	0x02
+
+#define ACKNOWLEDGE_NONE	0
+#define ACKNOWLEDGE_ACK		1
+#define ACKNOWLEDGE_NACK	2
+
+#define CRC_INIT		0xFFFF
+
+static int nci_spi_open(struct nci_dev *nci_dev)
+{
+	struct nci_spi_dev *ndev = nci_get_drvdata(nci_dev);
+
+	return ndev->ops->open(ndev);
+}
+
+static int nci_spi_close(struct nci_dev *nci_dev)
+{
+	struct nci_spi_dev *ndev = nci_get_drvdata(nci_dev);
+
+	return ndev->ops->close(ndev);
+}
+
+static int __nci_spi_send(struct nci_spi_dev *ndev, struct sk_buff *skb)
+{
+	struct spi_message m;
+	struct spi_transfer t;
+
+	t.tx_buf = skb->data;
+	t.len = skb->len;
+	t.cs_change = 0;
+	t.delay_usecs = ndev->xfer_udelay;
+
+	spi_message_init(&m);
+	spi_message_add_tail(&t, &m);
+
+	return spi_sync(ndev->spi, &m);
+}
+
+static int nci_spi_send(struct nci_dev *nci_dev, struct sk_buff *skb)
+{
+	struct nci_spi_dev *ndev = nci_get_drvdata(nci_dev);
+	unsigned int payload_len = skb->len;
+	unsigned char *hdr;
+	int ret;
+	long completion_rc;
+
+	ndev->ops->deassert_int(ndev);
+
+	/* add the NCI SPI header to the start of the buffer */
+	hdr = skb_push(skb, NCI_SPI_HDR_LEN);
+	hdr[0] = NCI_SPI_DIRECT_WRITE;
+	hdr[1] = ndev->acknowledge_mode;
+	hdr[2] = payload_len >> 8;
+	hdr[3] = payload_len & 0xFF;
+
+	if (ndev->acknowledge_mode == NCI_SPI_CRC_ENABLED) {
+		u16 crc;
+
+		crc = crc_ccitt(CRC_INIT, skb->data, skb->len);
+		*skb_put(skb, 1) = crc >> 8;
+		*skb_put(skb, 1) = crc & 0xFF;
+	}
+
+	ret = __nci_spi_send(ndev, skb);
+
+	kfree_skb(skb);
+	ndev->ops->assert_int(ndev);
+
+	if (ret != 0 || ndev->acknowledge_mode == NCI_SPI_CRC_DISABLED)
+		goto done;
+
+	init_completion(&ndev->req_completion);
+	completion_rc =
+		wait_for_completion_interruptible_timeout(&ndev->req_completion,
+							  NCI_SPI_SEND_TIMEOUT);
+
+	if (completion_rc <= 0 || ndev->req_result == ACKNOWLEDGE_NACK)
+		ret = -EIO;
+
+done:
+	return ret;
+}
+
+static struct nci_ops nci_spi_ops = {
+	.open = nci_spi_open,
+	.close = nci_spi_close,
+	.send = nci_spi_send,
+};
+
+/* ---- Interface to NCI SPI drivers ---- */
+
+/**
+ * nci_spi_allocate_device - allocate a new nci spi device
+ *
+ * @spi: SPI device
+ * @ops: device operations
+ * @supported_protocols: NFC protocols supported by the device
+ * @supported_se: NFC Secure Elements supported by the device
+ * @acknowledge_mode: Acknowledge mode used by the device
+ * @delay: delay between transactions in us
+ */
+struct nci_spi_dev *nci_spi_allocate_device(struct spi_device *spi,
+						struct nci_spi_ops *ops,
+						u32 supported_protocols,
+						u32 supported_se,
+						u8 acknowledge_mode,
+						unsigned int delay)
+{
+	struct nci_spi_dev *ndev;
+	int tailroom = 0;
+
+	if (!ops->open || !ops->close || !ops->assert_int || !ops->deassert_int)
+		return NULL;
+
+	if (!supported_protocols)
+		return NULL;
+
+	ndev = devm_kzalloc(&spi->dev, sizeof(struct nci_dev), GFP_KERNEL);
+	if (!ndev)
+		return NULL;
+
+	ndev->ops = ops;
+	ndev->acknowledge_mode = acknowledge_mode;
+	ndev->xfer_udelay = delay;
+
+	if (acknowledge_mode == NCI_SPI_CRC_ENABLED)
+		tailroom += NCI_SPI_CRC_LEN;
+
+	ndev->nci_dev = nci_allocate_device(&nci_spi_ops, supported_protocols,
+					    NCI_SPI_HDR_LEN, tailroom);
+	if (!ndev->nci_dev)
+		return NULL;
+
+	nci_set_drvdata(ndev->nci_dev, ndev);
+
+	return ndev;
+}
+EXPORT_SYMBOL_GPL(nci_spi_allocate_device);
+
+/**
+ * nci_spi_free_device - deallocate nci spi device
+ *
+ * @ndev: The nci spi device to deallocate
+ */
+void nci_spi_free_device(struct nci_spi_dev *ndev)
+{
+	nci_free_device(ndev->nci_dev);
+}
+EXPORT_SYMBOL_GPL(nci_spi_free_device);
+
+/**
+ * nci_spi_register_device - register a nci spi device in the nfc subsystem
+ *
+ * @pdev: The nci spi device to register
+ */
+int nci_spi_register_device(struct nci_spi_dev *ndev)
+{
+	return nci_register_device(ndev->nci_dev);
+}
+EXPORT_SYMBOL_GPL(nci_spi_register_device);
+
+/**
+ * nci_spi_unregister_device - unregister a nci spi device in the nfc subsystem
+ *
+ * @dev: The nci spi device to unregister
+ */
+void nci_spi_unregister_device(struct nci_spi_dev *ndev)
+{
+	nci_unregister_device(ndev->nci_dev);
+}
+EXPORT_SYMBOL_GPL(nci_spi_unregister_device);
+
+static int send_acknowledge(struct nci_spi_dev *ndev, u8 acknowledge)
+{
+	struct sk_buff *skb;
+	unsigned char *hdr;
+	u16 crc;
+	int ret;
+
+	skb = nci_skb_alloc(ndev->nci_dev, 0, GFP_KERNEL);
+
+	/* add the NCI SPI header to the start of the buffer */
+	hdr = skb_push(skb, NCI_SPI_HDR_LEN);
+	hdr[0] = NCI_SPI_DIRECT_WRITE;
+	hdr[1] = NCI_SPI_CRC_ENABLED;
+	hdr[2] = acknowledge << NCI_SPI_ACK_SHIFT;
+	hdr[3] = 0;
+
+	crc = crc_ccitt(CRC_INIT, skb->data, skb->len);
+	*skb_put(skb, 1) = crc >> 8;
+	*skb_put(skb, 1) = crc & 0xFF;
+
+	ret = __nci_spi_send(ndev, skb);
+
+	kfree_skb(skb);
+
+	return ret;
+}
+
+static struct sk_buff *__nci_spi_recv_frame(struct nci_spi_dev *ndev)
+{
+	struct sk_buff *skb;
+	struct spi_message m;
+	unsigned char req[2], resp_hdr[2];
+	struct spi_transfer tx, rx;
+	unsigned short rx_len = 0;
+	int ret;
+
+	spi_message_init(&m);
+	req[0] = NCI_SPI_DIRECT_READ;
+	req[1] = ndev->acknowledge_mode;
+	tx.tx_buf = req;
+	tx.len = 2;
+	tx.cs_change = 0;
+	spi_message_add_tail(&tx, &m);
+	rx.rx_buf = resp_hdr;
+	rx.len = 2;
+	rx.cs_change = 1;
+	spi_message_add_tail(&rx, &m);
+	ret = spi_sync(ndev->spi, &m);
+
+	if (ret)
+		return NULL;
+
+	if (ndev->acknowledge_mode == NCI_SPI_CRC_ENABLED)
+		rx_len = ((resp_hdr[0] & NCI_SPI_MSB_PAYLOAD_MASK) << 8) +
+				resp_hdr[1] + NCI_SPI_CRC_LEN;
+	else
+		rx_len = (resp_hdr[0] << 8) | resp_hdr[1];
+
+	skb = nci_skb_alloc(ndev->nci_dev, rx_len, GFP_KERNEL);
+	if (!skb)
+		return NULL;
+
+	spi_message_init(&m);
+	rx.rx_buf = skb_put(skb, rx_len);
+	rx.len = rx_len;
+	rx.cs_change = 0;
+	rx.delay_usecs = ndev->xfer_udelay;
+	spi_message_add_tail(&rx, &m);
+	ret = spi_sync(ndev->spi, &m);
+
+	if (ret)
+		goto receive_error;
+
+	if (ndev->acknowledge_mode == NCI_SPI_CRC_ENABLED) {
+		*skb_push(skb, 1) = resp_hdr[1];
+		*skb_push(skb, 1) = resp_hdr[0];
+	}
+
+	return skb;
+
+receive_error:
+	kfree_skb(skb);
+
+	return NULL;
+}
+
+static int nci_spi_check_crc(struct sk_buff *skb)
+{
+	u16 crc_data = (skb->data[skb->len - 2] << 8) |
+			skb->data[skb->len - 1];
+	int ret;
+
+	ret = (crc_ccitt(CRC_INIT, skb->data, skb->len - NCI_SPI_CRC_LEN)
+			== crc_data);
+
+	skb_trim(skb, skb->len - NCI_SPI_CRC_LEN);
+
+	return ret;
+}
+
+static u8 nci_spi_get_ack(struct sk_buff *skb)
+{
+	u8 ret;
+
+	ret = skb->data[0] >> NCI_SPI_ACK_SHIFT;
+
+	/* Remove NFCC part of the header: ACK, NACK and MSB payload len */
+	skb_pull(skb, 2);
+
+	return ret;
+}
+
+/**
+ * nci_spi_recv_frame - receive frame from NCI SPI drivers
+ *
+ * @ndev: The nci spi device
+ * Context: can sleep
+ *
+ * This call may only be used from a context that may sleep.  The sleep
+ * is non-interruptible, and has no timeout.
+ *
+ * It returns zero on success, else a negative error code.
+ */
+int nci_spi_recv_frame(struct nci_spi_dev *ndev)
+{
+	struct sk_buff *skb;
+	int ret = 0;
+
+	ndev->ops->deassert_int(ndev);
+
+	/* Retrieve frame from SPI */
+	skb = __nci_spi_recv_frame(ndev);
+	if (!skb) {
+		ret = -EIO;
+		goto done;
+	}
+
+	if (ndev->acknowledge_mode == NCI_SPI_CRC_ENABLED) {
+		if (!nci_spi_check_crc(skb)) {
+			send_acknowledge(ndev, ACKNOWLEDGE_NACK);
+			goto done;
+		}
+
+		/* In case of acknowledged mode: if ACK or NACK received,
+		 * unblock completion of latest frame sent.
+		 */
+		ndev->req_result = nci_spi_get_ack(skb);
+		if (ndev->req_result)
+			complete(&ndev->req_completion);
+	}
+
+	/* If there is no payload (ACK/NACK only frame),
+	 * free the socket buffer
+	 */
+	if (skb->len == 0) {
+		kfree_skb(skb);
+		goto done;
+	}
+
+	if (ndev->acknowledge_mode == NCI_SPI_CRC_ENABLED)
+		send_acknowledge(ndev, ACKNOWLEDGE_ACK);
+
+	/* Forward skb to NCI core layer */
+	ret = nci_recv_frame(ndev->nci_dev, skb);
+
+done:
+	ndev->ops->assert_int(ndev);
+
+	return ret;
+}
+EXPORT_SYMBOL_GPL(nci_spi_recv_frame);