Merge tag 'net-next-6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-nextgrafted

Pull networking updates from Jakub Kicinski:
 "Core:

   - Add dedicated kmem_cache for typical/small skb->head, avoid having
     to access struct page at kfree time, and improve memory use.

   - Introduce sysctl to set default RPS configuration for new netdevs.

   - Define Netlink protocol specification format which can be used to
     describe messages used by each family and auto-generate parsers.
     Add tools for generating kernel data structures and uAPI headers.

   - Expose all net/core sysctls inside netns.

   - Remove 4s sleep in netpoll if carrier is instantly detected on
     boot.

   - Add configurable limit of MDB entries per port, and port-vlan.

   - Continue populating drop reasons throughout the stack.

   - Retire a handful of legacy Qdiscs and classifiers.

  Protocols:

   - Support IPv4 big TCP (TSO frames larger than 64kB).

   - Add IP_LOCAL_PORT_RANGE socket option, to control local port range
     on socket by socket basis.

   - Track and report in procfs number of MPTCP sockets used.

   - Support mixing IPv4 and IPv6 flows in the in-kernel MPTCP path
     manager.

   - IPv6: don't check net.ipv6.route.max_size and rely on garbage
     collection to free memory (similarly to IPv4).

   - Support Penultimate Segment Pop (PSP) flavor in SRv6 (RFC8986).

   - ICMP: add per-rate limit counters.

   - Add support for user scanning requests in ieee802154.

   - Remove static WEP support.

   - Support minimal Wi-Fi 7 Extremely High Throughput (EHT) rate
     reporting.

   - WiFi 7 EHT channel puncturing support (client & AP).

  BPF:

   - Add a rbtree data structure following the "next-gen data structure"
     precedent set by recently added linked list, that is, by using
     kfunc + kptr instead of adding a new BPF map type.

   - Expose XDP hints via kfuncs with initial support for RX hash and
     timestamp metadata.

   - Add BPF_F_NO_TUNNEL_KEY extension to bpf_skb_set_tunnel_key to
     better support decap on GRE tunnel devices not operating in collect
     metadata.

   - Improve x86 JIT's codegen for PROBE_MEM runtime error checks.

   - Remove the need for trace_printk_lock for bpf_trace_printk and
     bpf_trace_vprintk helpers.

   - Extend libbpf's bpf_tracing.h support for tracing arguments of
     kprobes/uprobes and syscall as a special case.

   - Significantly reduce the search time for module symbols by
     livepatch and BPF.

   - Enable cpumasks to be used as kptrs, which is useful for tracing
     programs tracking which tasks end up running on which CPUs in
     different time intervals.

   - Add support for BPF trampoline on s390x and riscv64.

   - Add capability to export the XDP features supported by the NIC.

   - Add __bpf_kfunc tag for marking kernel functions as kfuncs.

   - Add cgroup.memory=nobpf kernel parameter option to disable BPF
     memory accounting for container environments.

  Netfilter:

   - Remove the CLUSTERIP target. It has been marked as obsolete for
     years, and we still have WARN splats wrt races of the out-of-band
     /proc interface installed by this target.

   - Add 'destroy' commands to nf_tables. They are identical to the
     existing 'delete' commands, but do not return an error if the
     referenced object (set, chain, rule...) did not exist.

  Driver API:

   - Improve cpumask_local_spread() locality to help NICs set the right
     IRQ affinity on AMD platforms.

   - Separate C22 and C45 MDIO bus transactions more clearly.

   - Introduce new DCB table to control DSCP rewrite on egress.

   - Support configuration of Physical Layer Collision Avoidance (PLCA)
     Reconciliation Sublayer (RS) (802.3cg-2019). Modern version of
     shared medium Ethernet.

   - Support for MAC Merge layer (IEEE 802.3-2018 clause 99). Allowing
     preemption of low priority frames by high priority frames.

   - Add support for controlling MACSec offload using netlink SET.

   - Rework devlink instance refcounts to allow registration and
     de-registration under the instance lock. Split the code into
     multiple files, drop some of the unnecessarily granular locks and
     factor out common parts of netlink operation handling.

   - Add TX frame aggregation parameters (for USB drivers).

   - Add a new attr TCA_EXT_WARN_MSG to report TC (offload) warning
     messages with notifications for debug.

   - Allow offloading of UDP NEW connections via act_ct.

   - Add support for per action HW stats in TC.

   - Support hardware miss to TC action (continue processing in SW from
     a specific point in the action chain).

   - Warn if old Wireless Extension user space interface is used with
     modern cfg80211/mac80211 drivers. Do not support Wireless
     Extensions for Wi-Fi 7 devices at all. Everyone should switch to
     using nl80211 interface instead.

   - Improve the CAN bit timing configuration. Use extack to return
     error messages directly to user space, update the SJW handling,
     including the definition of a new default value that will benefit
     CAN-FD controllers, by increasing their oscillator tolerance.

  New hardware / drivers:

   - Ethernet:
      - nVidia BlueField-3 support (control traffic driver)
      - Ethernet support for imx93 SoCs
      - Motorcomm yt8531 gigabit Ethernet PHY
      - onsemi NCN26000 10BASE-T1S PHY (with support for PLCA)
      - Microchip LAN8841 PHY (incl. cable diagnostics and PTP)
      - Amlogic gxl MDIO mux

   - WiFi:
      - RealTek RTL8188EU (rtl8xxxu)
      - Qualcomm Wi-Fi 7 devices (ath12k)

   - CAN:
      - Renesas R-Car V4H

  Drivers:

   - Bluetooth:
      - Set Per Platform Antenna Gain (PPAG) for Intel controllers.

   - Ethernet NICs:
      - Intel (1G, igc):
         - support TSN / Qbv / packet scheduling features of i226 model
      - Intel (100G, ice):
         - use GNSS subsystem instead of TTY
         - multi-buffer XDP support
         - extend support for GPIO pins to E823 devices
      - nVidia/Mellanox:
         - update the shared buffer configuration on PFC commands
         - implement PTP adjphase function for HW offset control
         - TC support for Geneve and GRE with VF tunnel offload
         - more efficient crypto key management method
         - multi-port eswitch support
      - Netronome/Corigine:
         - add DCB IEEE support
         - support IPsec offloading for NFP3800
      - Freescale/NXP (enetc):
         - support XDP_REDIRECT for XDP non-linear buffers
         - improve reconfig, avoid link flap and waiting for idle
         - support MAC Merge layer
      - Other NICs:
         - sfc/ef100: add basic devlink support for ef100
         - ionic: rx_push mode operation (writing descriptors via MMIO)
         - bnxt: use the auxiliary bus abstraction for RDMA
         - r8169: disable ASPM and reset bus in case of tx timeout
         - cpsw: support QSGMII mode for J721e CPSW9G
         - cpts: support pulse-per-second output
         - ngbe: add an mdio bus driver
         - usbnet: optimize usbnet_bh() by avoiding unnecessary queuing
         - r8152: handle devices with FW with NCM support
         - amd-xgbe: support 10Mbps, 2.5GbE speeds and rx-adaptation
         - virtio-net: support multi buffer XDP
         - virtio/vsock: replace virtio_vsock_pkt with sk_buff
         - tsnep: XDP support

   - Ethernet high-speed switches:
      - nVidia/Mellanox (mlxsw):
         - add support for latency TLV (in FW control messages)
      - Microchip (sparx5):
         - separate explicit and implicit traffic forwarding rules, make
           the implicit rules always active
         - add support for egress DSCP rewrite
         - IS0 VCAP support (Ingress Classification)
         - IS2 VCAP filters (protos, L3 addrs, L4 ports, flags, ToS
           etc.)
         - ES2 VCAP support (Egress Access Control)
         - support for Per-Stream Filtering and Policing (802.1Q,
           8.6.5.1)

   - Ethernet embedded switches:
      - Marvell (mv88e6xxx):
         - add MAB (port auth) offload support
         - enable PTP receive for mv88e6390
      - NXP (ocelot):
         - support MAC Merge layer
         - support for the the vsc7512 internal copper phys
      - Microchip:
         - lan9303: convert to PHYLINK
         - lan966x: support TC flower filter statistics
         - lan937x: PTP support for KSZ9563/KSZ8563 and LAN937x
         - lan937x: support Credit Based Shaper configuration
         - ksz9477: support Energy Efficient Ethernet
      - other:
         - qca8k: convert to regmap read/write API, use bulk operations
         - rswitch: Improve TX timestamp accuracy

   - Intel WiFi (iwlwifi):
      - EHT (Wi-Fi 7) rate reporting
      - STEP equalizer support: transfer some STEP (connection to radio
        on platforms with integrated wifi) related parameters from the
        BIOS to the firmware.

   - Qualcomm 802.11ax WiFi (ath11k):
      - IPQ5018 support
      - Fine Timing Measurement (FTM) responder role support
      - channel 177 support

   - MediaTek WiFi (mt76):
      - per-PHY LED support
      - mt7996: EHT (Wi-Fi 7) support
      - Wireless Ethernet Dispatch (WED) reset support
      - switch to using page pool allocator

   - RealTek WiFi (rtw89):
      - support new version of Bluetooth co-existance

   - Mobile:
      - rmnet: support TX aggregation"

* tag 'net-next-6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next: (1872 commits)
  page_pool: add a comment explaining the fragment counter usage
  net: ethtool: fix __ethtool_dev_mm_supported() implementation
  ethtool: pse-pd: Fix double word in comments
  xsk: add linux/vmalloc.h to xsk.c
  sefltests: netdevsim: wait for devlink instance after netns removal
  selftest: fib_tests: Always cleanup before exit
  net/mlx5e: Align IPsec ASO result memory to be as required by hardware
  net/mlx5e: TC, Set CT miss to the specific ct action instance
  net/mlx5e: Rename CHAIN_TO_REG to MAPPED_OBJ_TO_REG
  net/mlx5: Refactor tc miss handling to a single function
  net/mlx5: Kconfig: Make tc offload depend on tc skb extension
  net/sched: flower: Support hardware miss to tc action
  net/sched: flower: Move filter handle initialization earlier
  net/sched: cls_api: Support hardware miss to tc action
  net/sched: Rename user cookie and act cookie
  sfc: fix builds without CONFIG_RTC_LIB
  sfc: clean up some inconsistent indentings
  net/mlx4_en: Introduce flexible array to silence overflow warning
  net: lan966x: Fix possible deadlock inside PTP
  net/ulp: Remove redundant ->clone() test in inet_clone_ulp().
  ...

1 files changed, 640 insertions, 0 deletions

diff --git a/drivers/infiniband/ulp/rtrs/rtrs.c b/drivers/infiniband/ulp/rtrs/rtrs.c
new file mode 100644
index 000000000..4bf9d868c
--- /dev/null
+++ b/drivers/infiniband/ulp/rtrs/rtrs.c
@@ -0,0 +1,640 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * RDMA Transport Layer
+ *
+ * Copyright (c) 2014 - 2018 ProfitBricks GmbH. All rights reserved.
+ * Copyright (c) 2018 - 2019 1&1 IONOS Cloud GmbH. All rights reserved.
+ * Copyright (c) 2019 - 2020 1&1 IONOS SE. All rights reserved.
+ */
+#undef pr_fmt
+#define pr_fmt(fmt) KBUILD_MODNAME " L" __stringify(__LINE__) ": " fmt
+
+#include <linux/module.h>
+#include <linux/inet.h>
+
+#include "rtrs-pri.h"
+#include "rtrs-log.h"
+
+MODULE_DESCRIPTION("RDMA Transport Core");
+MODULE_LICENSE("GPL");
+
+struct rtrs_iu *rtrs_iu_alloc(u32 iu_num, size_t size, gfp_t gfp_mask,
+			      struct ib_device *dma_dev,
+			      enum dma_data_direction dir,
+			      void (*done)(struct ib_cq *cq, struct ib_wc *wc))
+{
+	struct rtrs_iu *ius, *iu;
+	int i;
+
+	ius = kcalloc(iu_num, sizeof(*ius), gfp_mask);
+	if (!ius)
+		return NULL;
+	for (i = 0; i < iu_num; i++) {
+		iu = &ius[i];
+		iu->direction = dir;
+		iu->buf = kzalloc(size, gfp_mask);
+		if (!iu->buf)
+			goto err;
+
+		iu->dma_addr = ib_dma_map_single(dma_dev, iu->buf, size, dir);
+		if (ib_dma_mapping_error(dma_dev, iu->dma_addr))
+			goto err;
+
+		iu->cqe.done  = done;
+		iu->size      = size;
+	}
+	return ius;
+err:
+	rtrs_iu_free(ius, dma_dev, i);
+	return NULL;
+}
+EXPORT_SYMBOL_GPL(rtrs_iu_alloc);
+
+void rtrs_iu_free(struct rtrs_iu *ius, struct ib_device *ibdev, u32 queue_num)
+{
+	struct rtrs_iu *iu;
+	int i;
+
+	if (!ius)
+		return;
+
+	for (i = 0; i < queue_num; i++) {
+		iu = &ius[i];
+		ib_dma_unmap_single(ibdev, iu->dma_addr, iu->size, iu->direction);
+		kfree(iu->buf);
+	}
+	kfree(ius);
+}
+EXPORT_SYMBOL_GPL(rtrs_iu_free);
+
+int rtrs_iu_post_recv(struct rtrs_con *con, struct rtrs_iu *iu)
+{
+	struct rtrs_path *path = con->path;
+	struct ib_recv_wr wr;
+	struct ib_sge list;
+
+	list.addr   = iu->dma_addr;
+	list.length = iu->size;
+	list.lkey   = path->dev->ib_pd->local_dma_lkey;
+
+	if (list.length == 0) {
+		rtrs_wrn(con->path,
+			  "Posting receive work request failed, sg list is empty\n");
+		return -EINVAL;
+	}
+	wr = (struct ib_recv_wr) {
+		.wr_cqe  = &iu->cqe,
+		.sg_list = &list,
+		.num_sge = 1,
+	};
+
+	return ib_post_recv(con->qp, &wr, NULL);
+}
+EXPORT_SYMBOL_GPL(rtrs_iu_post_recv);
+
+int rtrs_post_recv_empty(struct rtrs_con *con, struct ib_cqe *cqe)
+{
+	struct ib_recv_wr wr;
+
+	wr = (struct ib_recv_wr) {
+		.wr_cqe  = cqe,
+	};
+
+	return ib_post_recv(con->qp, &wr, NULL);
+}
+EXPORT_SYMBOL_GPL(rtrs_post_recv_empty);
+
+static int rtrs_post_send(struct ib_qp *qp, struct ib_send_wr *head,
+			  struct ib_send_wr *wr, struct ib_send_wr *tail)
+{
+	if (head) {
+		struct ib_send_wr *next = head;
+
+		while (next->next)
+			next = next->next;
+		next->next = wr;
+	} else {
+		head = wr;
+	}
+
+	if (tail)
+		wr->next = tail;
+
+	return ib_post_send(qp, head, NULL);
+}
+
+int rtrs_iu_post_send(struct rtrs_con *con, struct rtrs_iu *iu, size_t size,
+		       struct ib_send_wr *head)
+{
+	struct rtrs_path *path = con->path;
+	struct ib_send_wr wr;
+	struct ib_sge list;
+
+	if (WARN_ON(size == 0))
+		return -EINVAL;
+
+	list.addr   = iu->dma_addr;
+	list.length = size;
+	list.lkey   = path->dev->ib_pd->local_dma_lkey;
+
+	wr = (struct ib_send_wr) {
+		.wr_cqe     = &iu->cqe,
+		.sg_list    = &list,
+		.num_sge    = 1,
+		.opcode     = IB_WR_SEND,
+		.send_flags = IB_SEND_SIGNALED,
+	};
+
+	return rtrs_post_send(con->qp, head, &wr, NULL);
+}
+EXPORT_SYMBOL_GPL(rtrs_iu_post_send);
+
+int rtrs_iu_post_rdma_write_imm(struct rtrs_con *con, struct rtrs_iu *iu,
+				struct ib_sge *sge, unsigned int num_sge,
+				u32 rkey, u64 rdma_addr, u32 imm_data,
+				enum ib_send_flags flags,
+				struct ib_send_wr *head,
+				struct ib_send_wr *tail)
+{
+	struct ib_rdma_wr wr;
+	int i;
+
+	wr = (struct ib_rdma_wr) {
+		.wr.wr_cqe	  = &iu->cqe,
+		.wr.sg_list	  = sge,
+		.wr.num_sge	  = num_sge,
+		.rkey		  = rkey,
+		.remote_addr	  = rdma_addr,
+		.wr.opcode	  = IB_WR_RDMA_WRITE_WITH_IMM,
+		.wr.ex.imm_data = cpu_to_be32(imm_data),
+		.wr.send_flags  = flags,
+	};
+
+	/*
+	 * If one of the sges has 0 size, the operation will fail with a
+	 * length error
+	 */
+	for (i = 0; i < num_sge; i++)
+		if (WARN_ONCE(sge[i].length == 0, "sg %d is zero length\n", i))
+			return -EINVAL;
+
+	return rtrs_post_send(con->qp, head, &wr.wr, tail);
+}
+EXPORT_SYMBOL_GPL(rtrs_iu_post_rdma_write_imm);
+
+static int rtrs_post_rdma_write_imm_empty(struct rtrs_con *con,
+					  struct ib_cqe *cqe,
+					  u32 imm_data,
+					  struct ib_send_wr *head)
+{
+	struct ib_rdma_wr wr;
+	struct rtrs_path *path = con->path;
+	enum ib_send_flags sflags;
+
+	atomic_dec_if_positive(&con->sq_wr_avail);
+	sflags = (atomic_inc_return(&con->wr_cnt) % path->signal_interval) ?
+		0 : IB_SEND_SIGNALED;
+
+	wr = (struct ib_rdma_wr) {
+		.wr.wr_cqe	= cqe,
+		.wr.send_flags	= sflags,
+		.wr.opcode	= IB_WR_RDMA_WRITE_WITH_IMM,
+		.wr.ex.imm_data	= cpu_to_be32(imm_data),
+	};
+
+	return rtrs_post_send(con->qp, head, &wr.wr, NULL);
+}
+
+static void qp_event_handler(struct ib_event *ev, void *ctx)
+{
+	struct rtrs_con *con = ctx;
+
+	switch (ev->event) {
+	case IB_EVENT_COMM_EST:
+		rtrs_info(con->path, "QP event %s (%d) received\n",
+			   ib_event_msg(ev->event), ev->event);
+		rdma_notify(con->cm_id, IB_EVENT_COMM_EST);
+		break;
+	default:
+		rtrs_info(con->path, "Unhandled QP event %s (%d) received\n",
+			   ib_event_msg(ev->event), ev->event);
+		break;
+	}
+}
+
+static bool is_pollqueue(struct rtrs_con *con)
+{
+	return con->cid >= con->path->irq_con_num;
+}
+
+static int create_cq(struct rtrs_con *con, int cq_vector, int nr_cqe,
+		     enum ib_poll_context poll_ctx)
+{
+	struct rdma_cm_id *cm_id = con->cm_id;
+	struct ib_cq *cq;
+
+	if (is_pollqueue(con))
+		cq = ib_alloc_cq(cm_id->device, con, nr_cqe, cq_vector,
+				 poll_ctx);
+	else
+		cq = ib_cq_pool_get(cm_id->device, nr_cqe, cq_vector, poll_ctx);
+
+	if (IS_ERR(cq)) {
+		rtrs_err(con->path, "Creating completion queue failed, errno: %ld\n",
+			  PTR_ERR(cq));
+		return PTR_ERR(cq);
+	}
+	con->cq = cq;
+	con->nr_cqe = nr_cqe;
+
+	return 0;
+}
+
+static int create_qp(struct rtrs_con *con, struct ib_pd *pd,
+		     u32 max_send_wr, u32 max_recv_wr, u32 max_sge)
+{
+	struct ib_qp_init_attr init_attr = {NULL};
+	struct rdma_cm_id *cm_id = con->cm_id;
+	int ret;
+
+	init_attr.cap.max_send_wr = max_send_wr;
+	init_attr.cap.max_recv_wr = max_recv_wr;
+	init_attr.cap.max_recv_sge = 1;
+	init_attr.event_handler = qp_event_handler;
+	init_attr.qp_context = con;
+	init_attr.cap.max_send_sge = max_sge;
+
+	init_attr.qp_type = IB_QPT_RC;
+	init_attr.send_cq = con->cq;
+	init_attr.recv_cq = con->cq;
+	init_attr.sq_sig_type = IB_SIGNAL_REQ_WR;
+
+	ret = rdma_create_qp(cm_id, pd, &init_attr);
+	if (ret) {
+		rtrs_err(con->path, "Creating QP failed, err: %d\n", ret);
+		return ret;
+	}
+	con->qp = cm_id->qp;
+
+	return ret;
+}
+
+static void destroy_cq(struct rtrs_con *con)
+{
+	if (con->cq) {
+		if (is_pollqueue(con))
+			ib_free_cq(con->cq);
+		else
+			ib_cq_pool_put(con->cq, con->nr_cqe);
+	}
+	con->cq = NULL;
+}
+
+int rtrs_cq_qp_create(struct rtrs_path *path, struct rtrs_con *con,
+		       u32 max_send_sge, int cq_vector, int nr_cqe,
+		       u32 max_send_wr, u32 max_recv_wr,
+		       enum ib_poll_context poll_ctx)
+{
+	int err;
+
+	err = create_cq(con, cq_vector, nr_cqe, poll_ctx);
+	if (err)
+		return err;
+
+	err = create_qp(con, path->dev->ib_pd, max_send_wr, max_recv_wr,
+			max_send_sge);
+	if (err) {
+		destroy_cq(con);
+		return err;
+	}
+	con->path = path;
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(rtrs_cq_qp_create);
+
+void rtrs_cq_qp_destroy(struct rtrs_con *con)
+{
+	if (con->qp) {
+		rdma_destroy_qp(con->cm_id);
+		con->qp = NULL;
+	}
+	destroy_cq(con);
+}
+EXPORT_SYMBOL_GPL(rtrs_cq_qp_destroy);
+
+static void schedule_hb(struct rtrs_path *path)
+{
+	queue_delayed_work(path->hb_wq, &path->hb_dwork,
+			   msecs_to_jiffies(path->hb_interval_ms));
+}
+
+void rtrs_send_hb_ack(struct rtrs_path *path)
+{
+	struct rtrs_con *usr_con = path->con[0];
+	u32 imm;
+	int err;
+
+	imm = rtrs_to_imm(RTRS_HB_ACK_IMM, 0);
+	err = rtrs_post_rdma_write_imm_empty(usr_con, path->hb_cqe, imm,
+					     NULL);
+	if (err) {
+		rtrs_err(path, "send HB ACK failed, errno: %d\n", err);
+		path->hb_err_handler(usr_con);
+		return;
+	}
+}
+EXPORT_SYMBOL_GPL(rtrs_send_hb_ack);
+
+static void hb_work(struct work_struct *work)
+{
+	struct rtrs_con *usr_con;
+	struct rtrs_path *path;
+	u32 imm;
+	int err;
+
+	path = container_of(to_delayed_work(work), typeof(*path), hb_dwork);
+	usr_con = path->con[0];
+
+	if (path->hb_missed_cnt > path->hb_missed_max) {
+		rtrs_err(path, "HB missed max reached.\n");
+		path->hb_err_handler(usr_con);
+		return;
+	}
+	if (path->hb_missed_cnt++) {
+		/* Reschedule work without sending hb */
+		schedule_hb(path);
+		return;
+	}
+
+	path->hb_last_sent = ktime_get();
+
+	imm = rtrs_to_imm(RTRS_HB_MSG_IMM, 0);
+	err = rtrs_post_rdma_write_imm_empty(usr_con, path->hb_cqe, imm,
+					     NULL);
+	if (err) {
+		rtrs_err(path, "HB send failed, errno: %d\n", err);
+		path->hb_err_handler(usr_con);
+		return;
+	}
+
+	schedule_hb(path);
+}
+
+void rtrs_init_hb(struct rtrs_path *path, struct ib_cqe *cqe,
+		  unsigned int interval_ms, unsigned int missed_max,
+		  void (*err_handler)(struct rtrs_con *con),
+		  struct workqueue_struct *wq)
+{
+	path->hb_cqe = cqe;
+	path->hb_interval_ms = interval_ms;
+	path->hb_err_handler = err_handler;
+	path->hb_wq = wq;
+	path->hb_missed_max = missed_max;
+	path->hb_missed_cnt = 0;
+	INIT_DELAYED_WORK(&path->hb_dwork, hb_work);
+}
+EXPORT_SYMBOL_GPL(rtrs_init_hb);
+
+void rtrs_start_hb(struct rtrs_path *path)
+{
+	schedule_hb(path);
+}
+EXPORT_SYMBOL_GPL(rtrs_start_hb);
+
+void rtrs_stop_hb(struct rtrs_path *path)
+{
+	cancel_delayed_work_sync(&path->hb_dwork);
+	path->hb_missed_cnt = 0;
+}
+EXPORT_SYMBOL_GPL(rtrs_stop_hb);
+
+static int rtrs_str_gid_to_sockaddr(const char *addr, size_t len,
+				     short port, struct sockaddr_storage *dst)
+{
+	struct sockaddr_ib *dst_ib = (struct sockaddr_ib *)dst;
+	int ret;
+
+	/*
+	 * We can use some of the IPv6 functions since GID is a valid
+	 * IPv6 address format
+	 */
+	ret = in6_pton(addr, len, dst_ib->sib_addr.sib_raw, '\0', NULL);
+	if (ret == 0)
+		return -EINVAL;
+
+	dst_ib->sib_family = AF_IB;
+	/*
+	 * Use the same TCP server port number as the IB service ID
+	 * on the IB port space range
+	 */
+	dst_ib->sib_sid = cpu_to_be64(RDMA_IB_IP_PS_IB | port);
+	dst_ib->sib_sid_mask = cpu_to_be64(0xffffffffffffffffULL);
+	dst_ib->sib_pkey = cpu_to_be16(0xffff);
+
+	return 0;
+}
+
+/**
+ * rtrs_str_to_sockaddr() - Convert rtrs address string to sockaddr
+ * @addr:	String representation of an addr (IPv4, IPv6 or IB GID):
+ *              - "ip:192.168.1.1"
+ *              - "ip:fe80::200:5aee:feaa:20a2"
+ *              - "gid:fe80::200:5aee:feaa:20a2"
+ * @len:        String address length
+ * @port:	Destination port
+ * @dst:	Destination sockaddr structure
+ *
+ * Returns 0 if conversion successful. Non-zero on error.
+ */
+static int rtrs_str_to_sockaddr(const char *addr, size_t len,
+				u16 port, struct sockaddr_storage *dst)
+{
+	if (strncmp(addr, "gid:", 4) == 0) {
+		return rtrs_str_gid_to_sockaddr(addr + 4, len - 4, port, dst);
+	} else if (strncmp(addr, "ip:", 3) == 0) {
+		char port_str[8];
+		char *cpy;
+		int err;
+
+		snprintf(port_str, sizeof(port_str), "%u", port);
+		cpy = kstrndup(addr + 3, len - 3, GFP_KERNEL);
+		err = cpy ? inet_pton_with_scope(&init_net, AF_UNSPEC,
+						 cpy, port_str, dst) : -ENOMEM;
+		kfree(cpy);
+
+		return err;
+	}
+	return -EPROTONOSUPPORT;
+}
+
+/**
+ * sockaddr_to_str() - convert sockaddr to a string.
+ * @addr:	the sockadddr structure to be converted.
+ * @buf:	string containing socket addr.
+ * @len:	string length.
+ *
+ * The return value is the number of characters written into buf not
+ * including the trailing '\0'. If len is == 0 the function returns 0..
+ */
+int sockaddr_to_str(const struct sockaddr *addr, char *buf, size_t len)
+{
+	switch (addr->sa_family) {
+	case AF_IB:
+		return scnprintf(buf, len, "gid:%pI6",
+			&((struct sockaddr_ib *)addr)->sib_addr.sib_raw);
+	case AF_INET:
+		return scnprintf(buf, len, "ip:%pI4",
+			&((struct sockaddr_in *)addr)->sin_addr);
+	case AF_INET6:
+		return scnprintf(buf, len, "ip:%pI6c",
+			  &((struct sockaddr_in6 *)addr)->sin6_addr);
+	}
+	return scnprintf(buf, len, "<invalid address family>");
+}
+EXPORT_SYMBOL(sockaddr_to_str);
+
+/**
+ * rtrs_addr_to_str() - convert rtrs_addr to a string "src@dst"
+ * @addr:	the rtrs_addr structure to be converted
+ * @buf:	string containing source and destination addr of a path
+ *		separated by '@' I.e. "ip:1.1.1.1@ip:1.1.1.2"
+ *		"ip:1.1.1.1@ip:1.1.1.2".
+ * @len:	string length
+ *
+ * The return value is the number of characters written into buf not
+ * including the trailing '\0'.
+ */
+int rtrs_addr_to_str(const struct rtrs_addr *addr, char *buf, size_t len)
+{
+	int cnt;
+
+	cnt = sockaddr_to_str((struct sockaddr *)addr->src,
+			      buf, len);
+	cnt += scnprintf(buf + cnt, len - cnt, "@");
+	sockaddr_to_str((struct sockaddr *)addr->dst,
+			buf + cnt, len - cnt);
+	return cnt;
+}
+EXPORT_SYMBOL(rtrs_addr_to_str);
+
+/**
+ * rtrs_addr_to_sockaddr() - convert path string "src,dst" or "src@dst"
+ * to sockaddreses
+ * @str:	string containing source and destination addr of a path
+ *		separated by ',' or '@' I.e. "ip:1.1.1.1,ip:1.1.1.2" or
+ *		"ip:1.1.1.1@ip:1.1.1.2". If str contains only one address it's
+ *		considered to be destination.
+ * @len:	string length
+ * @port:	Destination port number.
+ * @addr:	will be set to the source/destination address or to NULL
+ *		if str doesn't contain any source address.
+ *
+ * Returns zero if conversion successful. Non-zero otherwise.
+ */
+int rtrs_addr_to_sockaddr(const char *str, size_t len, u16 port,
+			  struct rtrs_addr *addr)
+{
+	const char *d;
+
+	d = strchr(str, ',');
+	if (!d)
+		d = strchr(str, '@');
+	if (d) {
+		if (rtrs_str_to_sockaddr(str, d - str, 0, addr->src))
+			return -EINVAL;
+		d += 1;
+		len -= d - str;
+		str  = d;
+
+	} else {
+		addr->src = NULL;
+	}
+	return rtrs_str_to_sockaddr(str, len, port, addr->dst);
+}
+EXPORT_SYMBOL(rtrs_addr_to_sockaddr);
+
+void rtrs_rdma_dev_pd_init(enum ib_pd_flags pd_flags,
+			    struct rtrs_rdma_dev_pd *pool)
+{
+	INIT_LIST_HEAD(&pool->list);
+	mutex_init(&pool->mutex);
+	pool->pd_flags = pd_flags;
+}
+EXPORT_SYMBOL(rtrs_rdma_dev_pd_init);
+
+void rtrs_rdma_dev_pd_deinit(struct rtrs_rdma_dev_pd *pool)
+{
+	mutex_destroy(&pool->mutex);
+	WARN_ON(!list_empty(&pool->list));
+}
+EXPORT_SYMBOL(rtrs_rdma_dev_pd_deinit);
+
+static void dev_free(struct kref *ref)
+{
+	struct rtrs_rdma_dev_pd *pool;
+	struct rtrs_ib_dev *dev;
+
+	dev = container_of(ref, typeof(*dev), ref);
+	pool = dev->pool;
+
+	mutex_lock(&pool->mutex);
+	list_del(&dev->entry);
+	mutex_unlock(&pool->mutex);
+
+	ib_dealloc_pd(dev->ib_pd);
+	kfree(dev);
+}
+
+int rtrs_ib_dev_put(struct rtrs_ib_dev *dev)
+{
+	return kref_put(&dev->ref, dev_free);
+}
+EXPORT_SYMBOL(rtrs_ib_dev_put);
+
+static int rtrs_ib_dev_get(struct rtrs_ib_dev *dev)
+{
+	return kref_get_unless_zero(&dev->ref);
+}
+
+struct rtrs_ib_dev *
+rtrs_ib_dev_find_or_add(struct ib_device *ib_dev,
+			 struct rtrs_rdma_dev_pd *pool)
+{
+	struct rtrs_ib_dev *dev;
+
+	mutex_lock(&pool->mutex);
+	list_for_each_entry(dev, &pool->list, entry) {
+		if (dev->ib_dev->node_guid == ib_dev->node_guid &&
+		    rtrs_ib_dev_get(dev))
+			goto out_unlock;
+	}
+	mutex_unlock(&pool->mutex);
+	dev = kzalloc(sizeof(*dev), GFP_KERNEL);
+	if (!dev)
+		goto out_err;
+
+	kref_init(&dev->ref);
+	dev->pool = pool;
+	dev->ib_dev = ib_dev;
+	dev->ib_pd = ib_alloc_pd(ib_dev, pool->pd_flags);
+	if (IS_ERR(dev->ib_pd))
+		goto out_free_dev;
+
+	if (pool->ops && pool->ops->init && pool->ops->init(dev))
+		goto out_free_pd;
+
+	mutex_lock(&pool->mutex);
+	list_add(&dev->entry, &pool->list);
+out_unlock:
+	mutex_unlock(&pool->mutex);
+	return dev;
+
+out_free_pd:
+	ib_dealloc_pd(dev->ib_pd);
+out_free_dev:
+	kfree(dev);
+out_err:
+	return NULL;
+}
+EXPORT_SYMBOL(rtrs_ib_dev_find_or_add);