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

Pull networking updates from David Miller:
 "Highlights:

   1) Support TX_RING in AF_PACKET TPACKET_V3 mode, from Sowmini
      Varadhan.

   2) Simplify classifier state on sk_buff in order to shrink it a bit.
      From Willem de Bruijn.

   3) Introduce SIPHASH and it's usage for secure sequence numbers and
      syncookies. From Jason A. Donenfeld.

   4) Reduce CPU usage for ICMP replies we are going to limit or
      suppress, from Jesper Dangaard Brouer.

   5) Introduce Shared Memory Communications socket layer, from Ursula
      Braun.

   6) Add RACK loss detection and allow it to actually trigger fast
      recovery instead of just assisting after other algorithms have
      triggered it. From Yuchung Cheng.

   7) Add xmit_more and BQL support to mvneta driver, from Simon Guinot.

   8) skb_cow_data avoidance in esp4 and esp6, from Steffen Klassert.

   9) Export MPLS packet stats via netlink, from Robert Shearman.

  10) Significantly improve inet port bind conflict handling, especially
      when an application is restarted and changes it's setting of
      reuseport. From Josef Bacik.

  11) Implement TX batching in vhost_net, from Jason Wang.

  12) Extend the dummy device so that VF (virtual function) features,
      such as configuration, can be more easily tested. From Phil
      Sutter.

  13) Avoid two atomic ops per page on x86 in bnx2x driver, from Eric
      Dumazet.

  14) Add new bpf MAP, implementing a longest prefix match trie. From
      Daniel Mack.

  15) Packet sample offloading support in mlxsw driver, from Yotam Gigi.

  16) Add new aquantia driver, from David VomLehn.

  17) Add bpf tracepoints, from Daniel Borkmann.

  18) Add support for port mirroring to b53 and bcm_sf2 drivers, from
      Florian Fainelli.

  19) Remove custom busy polling in many drivers, it is done in the core
      networking since 4.5 times. From Eric Dumazet.

  20) Support XDP adjust_head in virtio_net, from John Fastabend.

  21) Fix several major holes in neighbour entry confirmation, from
      Julian Anastasov.

  22) Add XDP support to bnxt_en driver, from Michael Chan.

  23) VXLAN offloads for enic driver, from Govindarajulu Varadarajan.

  24) Add IPVTAP driver (IP-VLAN based tap driver) from Sainath Grandhi.

  25) Support GRO in IPSEC protocols, from Steffen Klassert"

* git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next: (1764 commits)
  Revert "ath10k: Search SMBIOS for OEM board file extension"
  net: socket: fix recvmmsg not returning error from sock_error
  bnxt_en: use eth_hw_addr_random()
  bpf: fix unlocking of jited image when module ronx not set
  arch: add ARCH_HAS_SET_MEMORY config
  net: napi_watchdog() can use napi_schedule_irqoff()
  tcp: Revert "tcp: tcp_probe: use spin_lock_bh()"
  net/hsr: use eth_hw_addr_random()
  net: mvpp2: enable building on 64-bit platforms
  net: mvpp2: switch to build_skb() in the RX path
  net: mvpp2: simplify MVPP2_PRS_RI_* definitions
  net: mvpp2: fix indentation of MVPP2_EXT_GLOBAL_CTRL_DEFAULT
  net: mvpp2: remove unused register definitions
  net: mvpp2: simplify mvpp2_bm_bufs_add()
  net: mvpp2: drop useless fields in mvpp2_bm_pool and related code
  net: mvpp2: remove unused 'tx_skb' field of 'struct mvpp2_tx_queue'
  net: mvpp2: release reference to txq_cpu[] entry after unmapping
  net: mvpp2: handle too large value in mvpp2_rx_time_coal_set()
  net: mvpp2: handle too large value handling in mvpp2_rx_pkts_coal_set()
  net: mvpp2: remove useless arguments in mvpp2_rx_{pkts, time}_coal_set
  ...

1 files changed, 279 insertions, 0 deletions

diff --git a/drivers/net/ethernet/netronome/nfp/nfpcore/nfp_resource.c b/drivers/net/ethernet/netronome/nfp/nfpcore/nfp_resource.c
new file mode 100644
index 000000000000..a2850344f8b4
--- /dev/null
+++ b/drivers/net/ethernet/netronome/nfp/nfpcore/nfp_resource.c
@@ -0,0 +1,279 @@
+/*
+ * Copyright (C) 2015-2017 Netronome Systems, Inc.
+ *
+ * This software is dual licensed under the GNU General License Version 2,
+ * June 1991 as shown in the file COPYING in the top-level directory of this
+ * source tree or the BSD 2-Clause License provided below.  You have the
+ * option to license this software under the complete terms of either license.
+ *
+ * The BSD 2-Clause License:
+ *
+ *     Redistribution and use in source and binary forms, with or
+ *     without modification, are permitted provided that the following
+ *     conditions are met:
+ *
+ *      1. Redistributions of source code must retain the above
+ *         copyright notice, this list of conditions and the following
+ *         disclaimer.
+ *
+ *      2. Redistributions in binary form must reproduce the above
+ *         copyright notice, this list of conditions and the following
+ *         disclaimer in the documentation and/or other materials
+ *         provided with the distribution.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+/*
+ * nfp_resource.c
+ * Author: Jakub Kicinski <jakub.kicinski@netronome.com>
+ *         Jason McMullan <jason.mcmullan@netronome.com>
+ */
+#include <linux/delay.h>
+#include <linux/kernel.h>
+#include <linux/slab.h>
+
+#include "crc32.h"
+#include "nfp.h"
+#include "nfp_cpp.h"
+#include "nfp6000/nfp6000.h"
+
+#define NFP_RESOURCE_ENTRY_NAME_SZ	8
+
+/**
+ * struct nfp_resource_entry - Resource table entry
+ * @owner:		NFP CPP Lock, interface owner
+ * @key:		NFP CPP Lock, posix_crc32(name, 8)
+ * @region:		Memory region descriptor
+ * @name:		ASCII, zero padded name
+ * @reserved
+ * @cpp_action:		CPP Action
+ * @cpp_token:		CPP Token
+ * @cpp_target:		CPP Target ID
+ * @page_offset:	256-byte page offset into target's CPP address
+ * @page_size:		size, in 256-byte pages
+ */
+struct nfp_resource_entry {
+	struct nfp_resource_entry_mutex {
+		u32 owner;
+		u32 key;
+	} mutex;
+	struct nfp_resource_entry_region {
+		u8  name[NFP_RESOURCE_ENTRY_NAME_SZ];
+		u8  reserved[5];
+		u8  cpp_action;
+		u8  cpp_token;
+		u8  cpp_target;
+		u32 page_offset;
+		u32 page_size;
+	} region;
+};
+
+#define NFP_RESOURCE_TBL_SIZE		4096
+#define NFP_RESOURCE_TBL_ENTRIES	(NFP_RESOURCE_TBL_SIZE /	\
+					 sizeof(struct nfp_resource_entry))
+
+struct nfp_resource {
+	char name[NFP_RESOURCE_ENTRY_NAME_SZ + 1];
+	u32 cpp_id;
+	u64 addr;
+	u64 size;
+	struct nfp_cpp_mutex *mutex;
+};
+
+static int nfp_cpp_resource_find(struct nfp_cpp *cpp, struct nfp_resource *res)
+{
+	char name_pad[NFP_RESOURCE_ENTRY_NAME_SZ] = {};
+	struct nfp_resource_entry entry;
+	u32 cpp_id, key;
+	int ret, i;
+
+	cpp_id = NFP_CPP_ID(NFP_RESOURCE_TBL_TARGET, 3, 0);  /* Atomic read */
+
+	strncpy(name_pad, res->name, sizeof(name_pad));
+
+	/* Search for a matching entry */
+	key = NFP_RESOURCE_TBL_KEY;
+	if (memcmp(name_pad, NFP_RESOURCE_TBL_NAME "\0\0\0\0\0\0\0\0", 8))
+		key = crc32_posix(name_pad, sizeof(name_pad));
+
+	for (i = 0; i < NFP_RESOURCE_TBL_ENTRIES; i++) {
+		u64 addr = NFP_RESOURCE_TBL_BASE +
+			sizeof(struct nfp_resource_entry) * i;
+
+		ret = nfp_cpp_read(cpp, cpp_id, addr, &entry, sizeof(entry));
+		if (ret != sizeof(entry))
+			return -EIO;
+
+		if (entry.mutex.key != key)
+			continue;
+
+		/* Found key! */
+		res->mutex =
+			nfp_cpp_mutex_alloc(cpp,
+					    NFP_RESOURCE_TBL_TARGET, addr, key);
+		res->cpp_id = NFP_CPP_ID(entry.region.cpp_target,
+					 entry.region.cpp_action,
+					 entry.region.cpp_token);
+		res->addr = (u64)entry.region.page_offset << 8;
+		res->size = (u64)entry.region.page_size << 8;
+
+		return 0;
+	}
+
+	return -ENOENT;
+}
+
+static int
+nfp_resource_try_acquire(struct nfp_cpp *cpp, struct nfp_resource *res,
+			 struct nfp_cpp_mutex *dev_mutex)
+{
+	int err;
+
+	if (nfp_cpp_mutex_lock(dev_mutex))
+		return -EINVAL;
+
+	err = nfp_cpp_resource_find(cpp, res);
+	if (err)
+		goto err_unlock_dev;
+
+	err = nfp_cpp_mutex_trylock(res->mutex);
+	if (err)
+		goto err_res_mutex_free;
+
+	nfp_cpp_mutex_unlock(dev_mutex);
+
+	return 0;
+
+err_res_mutex_free:
+	nfp_cpp_mutex_free(res->mutex);
+err_unlock_dev:
+	nfp_cpp_mutex_unlock(dev_mutex);
+
+	return err;
+}
+
+/**
+ * nfp_resource_acquire() - Acquire a resource handle
+ * @cpp:	NFP CPP handle
+ * @name:	Name of the resource
+ *
+ * NOTE: This function locks the acquired resource
+ *
+ * Return: NFP Resource handle, or ERR_PTR()
+ */
+struct nfp_resource *
+nfp_resource_acquire(struct nfp_cpp *cpp, const char *name)
+{
+	unsigned long warn_at = jiffies + 15 * HZ;
+	struct nfp_cpp_mutex *dev_mutex;
+	struct nfp_resource *res;
+	int err;
+
+	res = kzalloc(sizeof(*res), GFP_KERNEL);
+	if (!res)
+		return ERR_PTR(-ENOMEM);
+
+	strncpy(res->name, name, NFP_RESOURCE_ENTRY_NAME_SZ);
+
+	dev_mutex = nfp_cpp_mutex_alloc(cpp, NFP_RESOURCE_TBL_TARGET,
+					NFP_RESOURCE_TBL_BASE,
+					NFP_RESOURCE_TBL_KEY);
+	if (!dev_mutex) {
+		kfree(res);
+		return ERR_PTR(-ENOMEM);
+	}
+
+	for (;;) {
+		err = nfp_resource_try_acquire(cpp, res, dev_mutex);
+		if (!err)
+			break;
+		if (err != -EBUSY)
+			goto err_free;
+
+		err = msleep_interruptible(1);
+		if (err != 0) {
+			err = -ERESTARTSYS;
+			goto err_free;
+		}
+
+		if (time_is_before_eq_jiffies(warn_at)) {
+			warn_at = jiffies + 60 * HZ;
+			nfp_warn(cpp, "Warning: waiting for NFP resource %s\n",
+				 name);
+		}
+	}
+
+	nfp_cpp_mutex_free(dev_mutex);
+
+	return res;
+
+err_free:
+	nfp_cpp_mutex_free(dev_mutex);
+	kfree(res);
+	return ERR_PTR(err);
+}
+
+/**
+ * nfp_resource_release() - Release a NFP Resource handle
+ * @res:	NFP Resource handle
+ *
+ * NOTE: This function implictly unlocks the resource handle
+ */
+void nfp_resource_release(struct nfp_resource *res)
+{
+	nfp_cpp_mutex_unlock(res->mutex);
+	nfp_cpp_mutex_free(res->mutex);
+	kfree(res);
+}
+
+/**
+ * nfp_resource_cpp_id() - Return the cpp_id of a resource handle
+ * @res:	NFP Resource handle
+ *
+ * Return: NFP CPP ID
+ */
+u32 nfp_resource_cpp_id(struct nfp_resource *res)
+{
+	return res->cpp_id;
+}
+
+/**
+ * nfp_resource_name() - Return the name of a resource handle
+ * @res:	NFP Resource handle
+ *
+ * Return: const char pointer to the name of the resource
+ */
+const char *nfp_resource_name(struct nfp_resource *res)
+{
+	return res->name;
+}
+
+/**
+ * nfp_resource_address() - Return the address of a resource handle
+ * @res:	NFP Resource handle
+ *
+ * Return: Address of the resource
+ */
+u64 nfp_resource_address(struct nfp_resource *res)
+{
+	return res->addr;
+}
+
+/**
+ * nfp_resource_size() - Return the size in bytes of a resource handle
+ * @res:	NFP Resource handle
+ *
+ * Return: Size of the resource in bytes
+ */
+u64 nfp_resource_size(struct nfp_resource *res)
+{
+	return res->size;
+}