[PATCH] RXE: A Soft RoCE back-end for the RVT

Moni Shoua
2016-01-06T18:56:19Z

This patch introduces an implementation of a back-end that works with
RVT to make RoCE Verbs transport over any Ethernet network device.

Example:

After loading ib_rxe_net.ko
echo eth1 > /sys/module/ib_rxe_net/parameters/add
will create rvt0 IB device in RVT with Ethernet link layer
---
drivers/infiniband/Kconfig | 1 +
drivers/infiniband/sw/Makefile | 1 +
drivers/infiniband/sw/rxe/Kconfig | 23 ++
drivers/infiniband/sw/rxe/Makefile | 5 +
drivers/infiniband/sw/rxe/rxe_net.c | 580 +++++++++++++++++++++++++++++++++
drivers/infiniband/sw/rxe/rxe_net.h | 89 +++++
drivers/infiniband/sw/rxe/rxe_sysfs.c | 167 ++++++++++
7 files changed, 866 insertions(+), 0 deletions(-)
create mode 100644 drivers/infiniband/sw/rxe/Kconfig
create mode 100644 drivers/infiniband/sw/rxe/Makefile
create mode 100644 drivers/infiniband/sw/rxe/rxe_net.c
create mode 100644 drivers/infiniband/sw/rxe/rxe_net.h
create mode 100644 drivers/infiniband/sw/rxe/rxe_sysfs.c

diff --git a/drivers/infiniband/Kconfig b/drivers/infiniband/Kconfig
index 1e82984..ef23047 100644
--- a/drivers/infiniband/Kconfig
+++ b/drivers/infiniband/Kconfig
@@ -75,6 +75,7 @@ source "drivers/infiniband/hw/ocrdma/Kconfig"
source "drivers/infiniband/hw/usnic/Kconfig"

source "drivers/infiniband/sw/rdmavt/Kconfig"
+source "drivers/infiniband/sw/rxe/Kconfig"

source "drivers/infiniband/ulp/ipoib/Kconfig"

diff --git a/drivers/infiniband/sw/Makefile b/drivers/infiniband/sw/Makefile
index c1f6377..9b9f68d 100644
--- a/drivers/infiniband/sw/Makefile
+++ b/drivers/infiniband/sw/Makefile
@@ -1,2 +1,3 @@
obj-$(CONFIG_INFINIBAND_RDMAVT) += rdmavt/
+obj-$(CONFIG_INFINIBAND_RXE) += rxe/

diff --git a/drivers/infiniband/sw/rxe/Kconfig b/drivers/infiniband/sw/rxe/Kconfig
new file mode 100644
index 0000000..d32843a
--- /dev/null
+++ b/drivers/infiniband/sw/rxe/Kconfig
@@ -0,0 +1,23 @@
+config INFINIBAND_RXE
+ tristate "RoCE RDMAVT backend driver"
+ depends on INET && PCI && INFINIBAND_RDMAVT
+ ---help---
+ This driver implements the InfiniBand RDMA transport over
+ the Linux network stack. It enables a system with a
+ standard Ethernet adapter to interoperate with a RoCE
+ adapter or with another system running the RXE driver.
+ Documentation on InfiniBand and RoCE can be downloaded at
+ www.infinibandta.org and www.openfabrics.org. (See also
+ siw which is a similar software driver for iWARP.)
+
+ The driver is split into two layers, one interfaces with the
+ Linux RDMA stack and implements a kernel or user space
+ verbs API. The user space verbs API requires a support
+ library named librxe which is loaded by the generic user
+ space verbs API, libibverbs. The other layer interfaces
+ with the Linux network stack at layer 3.
+
+ To configure and work with soft-RoCE driver please use the
+ following wiki page under "configure Soft-RoCE (RXE)" section:
+
+ https://github.com/SoftRoCE/rxe-dev/wiki/rxe-dev:-Home
diff --git a/drivers/infiniband/sw/rxe/Makefile b/drivers/infiniband/sw/rxe/Makefile
new file mode 100644
index 0000000..3f6c05b
--- /dev/null
+++ b/drivers/infiniband/sw/rxe/Makefile
@@ -0,0 +1,5 @@
+obj-$(CONFIG_INFINIBAND_RXE) += ib_rxe_net.o
+
+ib_rxe_net-y := \
+ rxe_net.o \
+ rxe_sysfs.o
diff --git a/drivers/infiniband/sw/rxe/rxe_net.c b/drivers/infiniband/sw/rxe/rxe_net.c
new file mode 100644
index 0000000..84c9606
--- /dev/null
+++ b/drivers/infiniband/sw/rxe/rxe_net.c
@@ -0,0 +1,580 @@
+/*
+ * Copyright (c) 2015 Mellanox Technologies Ltd. All rights reserved.
+ * Copyright (c) 2015 System Fabric Works, Inc. All rights reserved.
+ *
+ * This software is available to you under a choice of one of two
+ * licenses. You may choose to be licensed under the terms of the GNU
+ * General Public License (GPL) Version 2, available from the file
+ * COPYING in the main directory of this source tree, or the
+ * OpenIB.org BSD license below:
+ *
+ * Redistribution and use in source and binary forms, with or
+ * without modification, are permitted provided that the following
+ * conditions are met:
+ *
+ * - Redistributions of source code must retain the above
+ * copyright notice, this list of conditions and the following
+ * disclaimer.
+ *
+ * - 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.
+ */
+
+#include <linux/skbuff.h>
+#include <linux/if_arp.h>
+#include <linux/netdevice.h>
+#include <linux/if.h>
+#include <linux/if_vlan.h>
+#include <net/udp_tunnel.h>
+#include <net/sch_generic.h>
+#include <linux/netfilter.h>
+#include <rdma/ib_addr.h>
+#include <rdma/ib_user_rvt.h>
+#include <uapi/rdma/ib_user_rvt.h>
+
+#include "rxe_net.h"
+
+MODULE_AUTHOR("Bob Pearson, Frank Zago, John Groves");
+MODULE_DESCRIPTION("RDMA transport over Converged Enhanced Ethernet");
+MODULE_LICENSE("Dual BSD/GPL");
+
+/*
+ * note: this table is a replacement for a protocol specific pointer
+ * in struct net_device which exists for other ethertypes
+ * this allows us to not have to patch that data structure
+ * eventually we want to get our own when we're famous
+ */
+struct rxe_net_info net_info[RXE_MAX_IF_INDEX];
+spinlock_t net_info_lock; /* spinlock for net_info array */
+struct rxe_recv_sockets recv_sockets;
+
+static __be64 rxe_mac_to_eui64(struct net_device *ndev)
+{
+ unsigned char *mac_addr = ndev->dev_addr;
+ __be64 eui64;
+ unsigned char *dst = (unsigned char *)&eui64;
+
+ dst[0] = mac_addr[0] ^ 2;
+ dst[1] = mac_addr[1];
+ dst[2] = mac_addr[2];
+ dst[3] = 0xff;
+ dst[4] = 0xfe;
+ dst[5] = mac_addr[3];
+ dst[6] = mac_addr[4];
+ dst[7] = mac_addr[5];
+
+ return eui64;
+}
+
+static __be64 node_guid(struct rvt_dev *rdev)
+{
+ struct rxe_dev *xdev = to_xdev(rdev);
+
+ if (xdev && xdev->ndev)
+ return rxe_mac_to_eui64(xdev->ndev);
+ else
+ return 0LL;
+}
+
+static __be64 port_guid(struct rvt_dev *rdev, unsigned int port_num)
+{
+ struct rxe_dev *xdev = to_xdev(rdev);
+
+ if (xdev && xdev->ndev)
+ return rxe_mac_to_eui64(xdev->ndev) + port_num;
+ else
+ return 0LL;
+}
+
+static __be16 port_speed(struct rvt_dev *rdev, unsigned int port_num)
+{
+ struct rxe_dev *xdev = to_xdev(rdev);
+ struct ethtool_cmd cmd;
+
+ xdev->ndev->ethtool_ops->get_settings(xdev->ndev, &cmd);
+ return cmd.speed;
+}
+
+static struct device *dma_device(struct rvt_dev *rdev)
+{
+ struct rxe_dev *xdev = to_xdev(rdev);
+ struct net_device *ndev = xdev->ndev;
+
+ if (ndev->priv_flags & IFF_802_1Q_VLAN)
+ ndev = vlan_dev_real_dev(ndev);
+
+ return ndev->dev.parent;
+}
+
+static int mcast_add(struct rvt_dev *rdev, union ib_gid *mgid)
+{
+ int err;
+ unsigned char ll_addr[ETH_ALEN];
+ struct rxe_dev *xdev = to_xdev(rdev);
+
+ ipv6_eth_mc_map((struct in6_addr *)mgid->raw, ll_addr);
+ err = dev_mc_add(xdev->ndev, ll_addr);
+
+ return err;
+}
+
+static int mcast_delete(struct rvt_dev *rdev, union ib_gid *mgid)
+{
+ int err;
+ unsigned char ll_addr[ETH_ALEN];
+ struct rxe_dev *xdev = to_xdev(rdev);
+
+ ipv6_eth_mc_map((struct in6_addr *)mgid->raw, ll_addr);
+ err = dev_mc_del(xdev->ndev, ll_addr);
+
+ return err;
+}
+
+static int rxe_udp_encap_recv(struct sock *sk, struct sk_buff *skb)
+{
+ struct net_device *ndev = skb->dev;
+ struct rxe_dev *xdev = net_to_xdev(ndev);
+ struct rvt_dev *rdev = &xdev->rdev;
+
+ if (!xdev)
+ goto drop;
+
+ if (skb_linearize(skb)) {
+ pr_err("skb_linearize failed\n");
+ goto drop;
+ }
+
+ return rvt_rcv(skb, rdev, net_to_port(ndev));
+drop:
+ kfree_skb(skb);
+ return 0;
+}
+
+static struct socket *rxe_setup_udp_tunnel(struct net *net, __be16 port,
+ bool ipv6)
+{
+ int err;
+ struct socket *sock;
+ struct udp_port_cfg udp_cfg;
+ struct udp_tunnel_sock_cfg tnl_cfg;
+
+ memset(&udp_cfg, 0, sizeof(udp_cfg));
+
+ if (ipv6) {
+ udp_cfg.family = AF_INET6;
+ udp_cfg.ipv6_v6only = 1;
+ } else {
+ udp_cfg.family = AF_INET;
+ }
+
+ udp_cfg.local_udp_port = port;
+
+ /* Create UDP socket */
+ err = udp_sock_create(net, &udp_cfg, &sock);
+ if (err < 0) {
+ pr_err("failed to create udp socket. err = %d\n", err);
+ return ERR_PTR(err);
+ }
+
+ tnl_cfg.sk_user_data = NULL;
+ tnl_cfg.encap_type = 1;
+ tnl_cfg.encap_rcv = rxe_udp_encap_recv;
+ tnl_cfg.encap_destroy = NULL;
+
+ /* Setup UDP tunnel */
+ setup_udp_tunnel_sock(net, sock, &tnl_cfg);
+
+ return sock;
+}
+
+static void rxe_release_udp_tunnel(struct socket *sk)
+{
+ udp_tunnel_sock_release(sk);
+}
+
+static void rxe_skb_tx_dtor(struct sk_buff *skb)
+{
+ struct sock *sk = skb->sk;
+
+ rvt_send_done(sk->sk_user_data);
+
+}
+
+static int send(struct rvt_dev *rdev, struct rvt_av *av,
+ struct sk_buff *skb, void *flow)
+{
+ struct sk_buff *nskb;
+ int sent_bytes;
+ int err;
+ struct rxe_dev *xdev = to_xdev(rdev);
+ struct socket *sk = (struct socket *)flow;
+
+ nskb = skb_clone(skb, GFP_ATOMIC);
+ if (!nskb)
+ return -ENOMEM;
+
+ nskb->destructor = rxe_skb_tx_dtor;
+ nskb->sk = sk->sk;
+
+ sent_bytes = nskb->len;
+ if (av->network_type == RDMA_NETWORK_IPV4) {
+ err = ip_local_out(dev_net(xdev->ndev), nskb->sk, nskb);
+ } else if (av->network_type == RDMA_NETWORK_IPV6) {
+ err = ip6_local_out(dev_net(xdev->ndev), nskb->sk, nskb);
+ } else {
+ pr_err("Unknown layer 3 protocol: %d\n", av->network_type);
+ kfree_skb(nskb);
+ return -EINVAL;
+ }
+
+ if (unlikely(net_xmit_eval(err))) {
+ pr_debug("error sending packet: %d\n", err);
+ return -EAGAIN;
+ }
+
+ kfree_skb(skb);
+
+ return 0;
+}
+
+static int loopback(struct sk_buff *skb)
+{
+ struct net_device *ndev = skb->dev;
+ struct rxe_dev *xdev = net_to_xdev(ndev);
+ struct rvt_dev *rdev = &xdev->rdev;
+
+ return rvt_rcv(skb, rdev, net_to_port(ndev));
+}
+
+static struct sk_buff *alloc_sendbuf(struct rvt_dev *rdev, struct rvt_av *av, int paylen)
+{
+ unsigned int hdr_len;
+ struct sk_buff *skb;
+ struct rxe_dev *xdev = to_xdev(rdev);
+
+ if (av->network_type == RDMA_NETWORK_IPV4)
+ hdr_len = ETH_HLEN + sizeof(struct udphdr) +
+ sizeof(struct iphdr);
+ else
+ hdr_len = ETH_HLEN + sizeof(struct udphdr) +
+ sizeof(struct ipv6hdr);
+
+ skb = alloc_skb(paylen + hdr_len + LL_RESERVED_SPACE(xdev->ndev),
+ GFP_ATOMIC);
+ if (unlikely(!skb))
+ return NULL;
+
+ skb_reserve(skb, hdr_len + LL_RESERVED_SPACE(xdev->ndev));
+
+ skb->dev = xdev->ndev;
+ if (av->network_type == RDMA_NETWORK_IPV4)
+ skb->protocol = htons(ETH_P_IP);
+ else
+ skb->protocol = htons(ETH_P_IPV6);
+
+ return skb;
+}
+/*
+ * this is required by rxe_cfg to match rxe devices in
+ * /sys/class/infiniband up with their underlying ethernet devices
+ */
+static char *parent_name(struct rvt_dev *rdev, unsigned int port_num)
+{
+ struct rxe_dev *xdev = to_xdev(rdev);
+ return xdev->ndev->name;
+}
+
+static enum rdma_link_layer link_layer(struct rvt_dev *rxe,
+ unsigned int port_num)
+{
+ return IB_LINK_LAYER_ETHERNET;
+}
+
+static struct net_device *get_netdev(struct rvt_dev *rdev,
+ unsigned int port_num)
+{
+ struct rxe_dev *xdev = to_xdev(rdev);
+
+ return xdev->ndev;
+}
+
+int create_flow(struct rvt_dev *rdev, void **ctx, void *rvt_ctx)
+{
+ struct socket *sk;
+ int err;
+
+ *ctx = NULL;
+ err = sock_create_kern(&init_net, AF_INET, SOCK_DGRAM, 0, &sk);
+ if (err) {
+ pr_err("rxe: Failed to create socket for flow %p (%d)\n", rvt_ctx, err);
+ return err;
+ }
+ sk->sk->sk_user_data = rvt_ctx;
+ *ctx = sk;
+ return 0;
+}
+
+void destroy_flow(struct rvt_dev *rdev, void *ctx)
+{
+ struct socket *sk = (struct socket *)ctx;
+
+ kernel_sock_shutdown(sk, SHUT_RDWR);
+}
+
+static struct rvt_ifc_ops ifc_ops = {
+ .node_guid = node_guid,
+ .port_guid = port_guid,
+ .port_speed = port_speed,
+ .dma_device = dma_device,
+ .mcast_add = mcast_add,
+ .mcast_delete = mcast_delete,
+ .create_flow = create_flow,
+ .destroy_flow = destroy_flow,
+ .send = send,
+ .loopback = loopback,
+ .alloc_sendbuf = alloc_sendbuf,
+ .parent_name = parent_name,
+ .link_layer = link_layer,
+ .get_netdev = get_netdev,
+};
+
+/* Caller must hold net_info_lock */
+int rxe_net_add(struct net_device *ndev)
+{
+ struct rxe_dev *xdev;
+ unsigned port_num;
+ int err;
+
+ xdev = (struct rxe_dev *)rvt_alloc_device(sizeof *xdev);
+ if (!xdev)
+ return -ENOMEM;
+
+ xdev->ndev = ndev;
+ xdev->rdev.num_ports = 1;
+
+ err = rvt_register_device(&xdev->rdev, &ifc_ops, ndev->mtu);
+ if (err)
+ return err;
+
+
+ /* for now we always assign port = 1 */
+ port_num = 1;
+
+ xdev->ndev = ndev;
+
+
+ pr_info("rxe_net: added %s to %s\n",
+ xdev->rdev.ib_dev.name, ndev->name);
+
+ net_info[ndev->ifindex].xdev = xdev;
+ net_info[ndev->ifindex].port = port_num;
+ net_info[ndev->ifindex].ndev = ndev;
+ return 0;
+}
+
+/* Caller must hold net_info_lock */
+void rxe_net_up(struct net_device *ndev)
+{
+ struct rxe_dev *xdev;
+ struct rvt_dev *rdev;
+ struct rvt_port *port;
+ u8 port_num;
+
+ if (ndev->ifindex >= RXE_MAX_IF_INDEX)
+ goto out;
+
+ net_info[ndev->ifindex].status = IB_PORT_ACTIVE;
+
+ xdev = net_to_xdev(ndev);
+ if (!xdev)
+ goto out;
+ rdev = &xdev->rdev;
+
+ port_num = net_to_port(ndev);
+ port = &rdev->port[port_num - 1];
+ port->attr.state = IB_PORT_ACTIVE;
+ port->attr.phys_state = IB_PHYS_STATE_LINK_UP;
+
+ pr_info("rxe_net: set %s active for %s\n",
+ rdev->ib_dev.name, ndev->name);
+out:
+ return;
+}
+
+/* Caller must hold net_info_lock */
+void rxe_net_down(struct net_device *ndev)
+{
+ struct rxe_dev *xdev;
+ struct rvt_dev *rdev;
+ struct rvt_port *port;
+ u8 port_num;
+
+ if (ndev->ifindex >= RXE_MAX_IF_INDEX)
+ goto out;
+
+ net_info[ndev->ifindex].status = IB_PORT_DOWN;
+
+ xdev = net_to_xdev(ndev);
+ if (!xdev)
+ goto out;
+ rdev = &xdev->rdev;
+
+ port_num = net_to_port(ndev);
+ port = &rdev->port[port_num - 1];
+ port->attr.state = IB_PORT_DOWN;
+ port->attr.phys_state = 3;
+
+ pr_info("rxe_net: set %s down for %s\n",
+ rdev->ib_dev.name, ndev->name);
+out:
+ return;
+}
+
+static int can_support_rxe(struct net_device *ndev)
+{
+ int rc = 0;
+
+ if (ndev->ifindex >= RXE_MAX_IF_INDEX) {
+ pr_debug("%s index %d: too large for rxe ndev table\n",
+ ndev->name, ndev->ifindex);
+ goto out;
+ }
+
+ /* Let's says we support all ethX devices */
+ if (ndev->type == ARPHRD_ETHER)
+ rc = 1;
+
+out:
+ return rc;
+}
+
+static int rxe_notify(struct notifier_block *not_blk,
+ unsigned long event,
+ void *arg)
+{
+ struct rxe_dev *xdev;
+ struct net_device *ndev = netdev_notifier_info_to_dev(arg);
+
+ if (!can_support_rxe(ndev))
+ goto out;
+
+ spin_lock_bh(&net_info_lock);
+ switch (event) {
+ case NETDEV_REGISTER:
+ /* Keep a record of this NIC. */
+ net_info[ndev->ifindex].status = IB_PORT_DOWN;
+ net_info[ndev->ifindex].xdev = NULL;
+ net_info[ndev->ifindex].port = 1;
+ net_info[ndev->ifindex].ndev = ndev;
+ break;
+
+ case NETDEV_UNREGISTER:
+ if (net_info[ndev->ifindex].xdev) {
+ xdev = net_info[ndev->ifindex].xdev;
+ net_info[ndev->ifindex].xdev = NULL;
+ spin_unlock_bh(&net_info_lock);
+ rvt_unregister_device(&xdev->rdev);
+ spin_lock_bh(&net_info_lock);
+ }
+ net_info[ndev->ifindex].status = 0;
+ net_info[ndev->ifindex].port = 0;
+ net_info[ndev->ifindex].ndev = NULL;
+ break;
+
+ case NETDEV_UP:
+ rxe_net_up(ndev);
+ break;
+
+ case NETDEV_DOWN:
+ rxe_net_down(ndev);
+ break;
+
+ case NETDEV_CHANGEMTU:
+ xdev = net_to_xdev(ndev);
+ if (xdev) {
+ pr_info("rxe_net: %s changed mtu to %d\n",
+ ndev->name, ndev->mtu);
+ rvt_set_mtu(&xdev->rdev, ndev->mtu, net_to_port(ndev));
+ }
+ break;
+
+ case NETDEV_REBOOT:
+ case NETDEV_CHANGE:
+ case NETDEV_GOING_DOWN:
+ case NETDEV_CHANGEADDR:
+ case NETDEV_CHANGENAME:
+ case NETDEV_FEAT_CHANGE:
+ default:
+ pr_info("rxe_net: ignoring netdev event = %ld for %s\n",
+ event, ndev->name);
+ break;
+ }
+ spin_unlock_bh(&net_info_lock);
+
+out:
+ return NOTIFY_OK;
+}
+
+static struct notifier_block rxe_net_notifier = {
+ .notifier_call = rxe_notify,
+};
+
+static int rxe_net_init(void)
+{
+ int err;
+
+ spin_lock_init(&net_info_lock);
+
+ recv_sockets.sk6 = rxe_setup_udp_tunnel(&init_net,
+ htons(ROCE_V2_UDP_DPORT), true);
+ if (IS_ERR(recv_sockets.sk6)) {
+ recv_sockets.sk6 = NULL;
+ pr_err("rxe: Failed to create IPv6 UDP tunnel\n");
+ return -1;
+ }
+
+ recv_sockets.sk4 = rxe_setup_udp_tunnel(&init_net,
+ htons(ROCE_V2_UDP_DPORT), false);
+ if (IS_ERR(recv_sockets.sk4)) {
+ rxe_release_udp_tunnel(recv_sockets.sk6);
+ recv_sockets.sk4 = NULL;
+ recv_sockets.sk6 = NULL;
+ pr_err("rxe: Failed to create IPv4 UDP tunnel\n");
+ return -1;
+ }
+
+
+ err = register_netdevice_notifier(&rxe_net_notifier);
+ if (err) {
+ rxe_release_udp_tunnel(recv_sockets.sk6);
+ rxe_release_udp_tunnel(recv_sockets.sk4);
+ pr_err("rxe: Failed to rigister netdev notifier\n");
+ }
+
+ return err;
+}
+
+static void rxe_net_exit(void)
+{
+ if (recv_sockets.sk6)
+ rxe_release_udp_tunnel(recv_sockets.sk6);
+
+ if (recv_sockets.sk4)
+ rxe_release_udp_tunnel(recv_sockets.sk4);
+
+ unregister_netdevice_notifier(&rxe_net_notifier);
+}
+
+module_init(rxe_net_init);
+module_exit(rxe_net_exit);
diff --git a/drivers/infiniband/sw/rxe/rxe_net.h b/drivers/infiniband/sw/rxe/rxe_net.h
new file mode 100644
index 0000000..04d4978
--- /dev/null
+++ b/drivers/infiniband/sw/rxe/rxe_net.h
@@ -0,0 +1,89 @@
+/*
+ * Copyright (c) 2015 Mellanox Technologies Ltd. All rights reserved.
+ * Copyright (c) 2015 System Fabric Works, Inc. All rights reserved.
+ *
+ * This software is available to you under a choice of one of two
+ * licenses. You may choose to be licensed under the terms of the GNU
+ * General Public License (GPL) Version 2, available from the file
+ * COPYING in the main directory of this source tree, or the
+ * OpenIB.org BSD license below:
+ *
+ * Redistribution and use in source and binary forms, with or
+ * without modification, are permitted provided that the following
+ * conditions are met:
+ *
+ * - Redistributions of source code must retain the above
+ * copyright notice, this list of conditions and the following
+ * disclaimer.
+ *
+ * - 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.
+ */
+
+#ifndef RXE_NET_H
+#define RXE_NET_H
+
+#include <net/sock.h>
+#include <net/if_inet6.h>
+#include <linux/module.h>
+#include <linux/crc32.h>
+#include <rdma/ib_rvt.h>
+
+#define RXE_MAX_IF_INDEX (384)
+#define RXE_ROCE_V2_SPORT (0xc000)
+
+struct rxe_dev {
+ struct rvt_dev rdev;
+ struct net_device *ndev;
+};
+
+struct rxe_net_info {
+ struct rxe_dev *xdev;
+ u8 port;
+ struct net_device *ndev;
+ int status;
+};
+
+struct rxe_recv_sockets {
+ struct socket *sk4;
+ struct socket *sk6;
+};
+
+extern struct rxe_recv_sockets recv_sockets;
+extern struct rxe_net_info net_info[RXE_MAX_IF_INDEX];
+extern spinlock_t net_info_lock;
+
+static inline struct rxe_dev *to_xdev(struct rvt_dev *rdev)
+{
+ return rdev ? container_of(rdev, struct rxe_dev, rdev) : NULL;
+}
+
+/* caller must hold net_dev_lock */
+static inline struct rxe_dev *net_to_xdev(struct net_device *ndev)
+{
+ return (ndev->ifindex >= RXE_MAX_IF_INDEX) ?
+ NULL : net_info[ndev->ifindex].xdev;
+}
+
+static inline u8 net_to_port(struct net_device *ndev)
+{
+ return net_info[ndev->ifindex].port;
+}
+
+int rxe_net_add(struct net_device *ndev);
+void rxe_net_up(struct net_device *ndev);
+void rxe_net_down(struct net_device *ndev);
+
+
+#endif /* RXE_NET_H */
diff --git a/drivers/infiniband/sw/rxe/rxe_sysfs.c b/drivers/infiniband/sw/rxe/rxe_sysfs.c
new file mode 100644
index 0000000..ee05da9
--- /dev/null
+++ b/drivers/infiniband/sw/rxe/rxe_sysfs.c
@@ -0,0 +1,167 @@
+/*
+ * Copyright (c) 2015 Mellanox Technologies Ltd. All rights reserved.
+ * Copyright (c) 2015 System Fabric Works, Inc. All rights reserved.
+ *
+ * This software is available to you under a choice of one of two
+ * licenses. You may choose to be licensed under the terms of the GNU
+ * General Public License (GPL) Version 2, available from the file
+ * COPYING in the main directory of this source tree, or the
+ * OpenIB.org BSD license below:
+ *
+ * Redistribution and use in source and binary forms, with or
+ * without modification, are permitted provided that the following
+ * conditions are met:
+ *
+ * - Redistributions of source code must retain the above
+ * copyright notice, this list of conditions and the following
+ * disclaimer.
+ *
+ * - 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.
+ */
+
+#include "rxe_net.h"
+
+/* Copy argument and remove trailing CR. Return the new length. */
+static int sanitize_arg(const char *val, char *intf, int intf_len)
+{
+ int len;
+
+ if (!val)
+ return 0;
+
+ /* Remove newline. */
+ for (len = 0; len < intf_len - 1 && val[len] && val[len] != '\n'; len++)
+ intf[len] = val[len];
+ intf[len] = 0;
+
+ if (len == 0 || (val[len] != 0 && val[len] != '\n'))
+ return 0;
+
+ return len;
+}
+
+/* Caller must hold net_info_lock */
+static void rxe_set_port_state(struct net_device *ndev)
+{
+ struct rxe_dev *xdev;
+
+ xdev = net_to_xdev(ndev);
+ if (!xdev)
+ goto out;
+
+ if (net_info[ndev->ifindex].status == IB_PORT_ACTIVE)
+ rxe_net_up(ndev);
+ else
+ rxe_net_down(ndev); /* down for unknown state */
+out:
+ return;
+}
+
+static int rxe_param_set_add(const char *val, struct kernel_param *kp)
+{
+ int i, len, err;
+ char intf[32];
+
+ len = sanitize_arg(val, intf, sizeof(intf));
+ if (!len) {
+ pr_err("rxe: add: invalid interface name\n");
+ return -EINVAL;
+ }
+
+ spin_lock_bh(&net_info_lock);
+ for (i = 0; i < RXE_MAX_IF_INDEX; i++) {
+ struct net_device *ndev = net_info[i].ndev;
+
+ if (ndev && (0 == strncmp(intf, ndev->name, len))) {
+ spin_unlock_bh(&net_info_lock);
+ if (net_info[i].xdev)
+ pr_info("rxe: already configured on %s\n",
+ intf);
+ else {
+ err = rxe_net_add(ndev);
+ if (!err && net_info[i].xdev) {
+ rxe_set_port_state(ndev);
+ } else {
+ pr_err("rxe: add appears to have failed for %s (index %d)\n",
+ intf, i);
+ }
+ }
+ return 0;
+ }
+ }
+ spin_unlock_bh(&net_info_lock);
+
+ pr_warn("interface %s not found\n", intf);
+
+ return 0;
+}
+
+static void rxe_remove_all(void)
+{
+ int i;
+ struct rxe_dev *xdev;
+
+ for (i = 0; i < RXE_MAX_IF_INDEX; i++) {
+ if (net_info[i].xdev) {
+ spin_lock_bh(&net_info_lock);
+ xdev = net_info[i].xdev;
+ net_info[i].xdev = NULL;
+ spin_unlock_bh(&net_info_lock);
+
+ rvt_unregister_device(&xdev->rdev);
+ }
+ }
+}
+
+static int rxe_param_set_remove(const char *val, struct kernel_param *kp)
+{
+ int i, len;
+ char intf[32];
+ struct rxe_dev *xdev;
+
+ len = sanitize_arg(val, intf, sizeof(intf));
+ if (!len) {
+ pr_err("xdev: remove: invalid interface name\n");
+ return -EINVAL;
+ }
+
+ if (strncmp("all", intf, len) == 0) {
+ pr_info("xdev_sys: remove all");
+ rxe_remove_all();
+ return 0;
+ }
+
+ spin_lock_bh(&net_info_lock);
+ for (i = 0; i < RXE_MAX_IF_INDEX; i++) {
+ if (!net_info[i].xdev || !net_info[i].ndev)
+ continue;
+
+ if (0 == strncmp(intf, net_info[i].xdev->rdev.ib_dev.name, len)) {
+ xdev = net_info[i].xdev;
+ net_info[i].xdev = NULL;
+ spin_unlock_bh(&net_info_lock);
+
+ rvt_unregister_device(&xdev->rdev);
+ return 0;
+ }
+ }
+ spin_unlock_bh(&net_info_lock);
+ pr_warn("xdev_sys: instance %s not found\n", intf);
+
+ return 0;
+}
+
+module_param_call(add, rxe_param_set_add, NULL, NULL, 0200);
+module_param_call(remove, rxe_param_set_remove, NULL, NULL, 0200);
--
1.7.1