Soft RoCE driver
Soft RoCE (RXE) - The software RoCE driver
ib_rxe implements the RDMA transport and registers to the RDMA core
device as a kernel verbs provider. It also implements the packet IO
layer. On the other hand ib_rxe registers to the Linux netdev stack
as a udp encapsulating protocol, in that case RDMA, for sending and
receiving packets over any Ethernet device. This yields a RDMA
transport over the UDP/Ethernet network layer forming a RoCEv2
compatible device.
The configuration procedure of the Soft RoCE drivers requires
binding to any existing Ethernet network device. This is done with
/sys interface.
A userspace Soft RoCE library (librxe) provides user applications
the ability to run with Soft RoCE devices. The use of rxe verbs ins
user space requires the inclusion of librxe as a device specifics
plug-in to libibverbs. librxe is packaged separately.
Architecture:
+-----------------------------------------------------------+
| Application |
+-----------------------------------------------------------+
+-----------------------------------+
| libibverbs |
User +-----------------------------------+
+----------------+ +----------------+
| librxe | | HW RoCE lib |
+----------------+ +----------------+
+---------------------------------------------------------------+
+--------------+ +------------+
| Sockets | | RDMA ULP |
+--------------+ +------------+
+--------------+ +---------------------+
| TCP/IP | | ib_core |
+--------------+ +---------------------+
+------------+ +----------------+
Kernel | ib_rxe | | HW RoCE driver |
+------------+ +----------------+
+------------------------------------+
| NIC driver |
+------------------------------------+
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+-----------------------------------------------------------+
| Application |
+-----------------------------------------------------------+
+-----------------------------------+
| libibverbs |
User +-----------------------------------+
+----------------+ +----------------+
| librxe | | HW RoCE lib |
+----------------+ +----------------+
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+--------------+ +------------+
| Sockets | | RDMA ULP |
+--------------+ +------------+
+--------------+ +---------------------+
| TCP/IP | | ib_core |
+--------------+ +---------------------+
+------------+ +----------------+
Kernel | ib_rxe | | HW RoCE driver |
+------------+ +----------------+
+------------------------------------+
| NIC driver |
+------------------------------------+
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Soft RoCE resources:
[1[ https://github.com/SoftRoCE/librxe-dev librxe - source code in
Github
[2] https://github.com/SoftRoCE/rxe-dev/wiki/rxe-dev:-Home - Soft RoCE
Wiki page
[3] https://github.com/SoftRoCE/librxe-dev - Soft RoCE userspace library
Signed-off-by: Kamal Heib <kamalh@mellanox.com>
Signed-off-by: Amir Vadai <amirv@mellanox.com>
Signed-off-by: Moni Shoua <monis@mellanox.com>
Reviewed-by: Haggai Eran <haggaie@mellanox.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>
This commit is contained in:
Moni Shoua
157
drivers/infiniband/sw/rxe/rxe_sysfs.c
Normal file
157
drivers/infiniband/sw/rxe/rxe_sysfs.c
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@@ -0,0 +1,157 @@
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/*
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* Copyright (c) 2016 Mellanox Technologies Ltd. All rights reserved.
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* Copyright (c) 2015 System Fabric Works, Inc. All rights reserved.
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*
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* This software is available to you under a choice of one of two
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* licenses. You may choose to be licensed under the terms of the GNU
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* General Public License (GPL) Version 2, available from the file
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* COPYING in the main directory of this source tree, or the
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* OpenIB.org BSD license below:
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*
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* Redistribution and use in source and binary forms, with or
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* without modification, are permitted provided that the following
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* conditions are met:
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*
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* - Redistributions of source code must retain the above
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* copyright notice, this list of conditions and the following
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* disclaimer.
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*
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* - Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following
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* disclaimer in the documentation and/or other materials
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* provided with the distribution.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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#include "rxe.h"
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#include "rxe_net.h"
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/* Copy argument and remove trailing CR. Return the new length. */
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static int sanitize_arg(const char *val, char *intf, int intf_len)
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{
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int len;
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if (!val)
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return 0;
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/* Remove newline. */
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for (len = 0; len < intf_len - 1 && val[len] && val[len] != '\n'; len++)
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intf[len] = val[len];
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intf[len] = 0;
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if (len == 0 || (val[len] != 0 && val[len] != '\n'))
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return 0;
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return len;
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}
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static void rxe_set_port_state(struct net_device *ndev)
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{
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struct rxe_dev *rxe = net_to_rxe(ndev);
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bool is_up = netif_running(ndev) && netif_carrier_ok(ndev);
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if (!rxe)
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goto out;
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if (is_up)
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rxe_port_up(rxe);
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else
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rxe_port_down(rxe); /* down for unknown state */
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out:
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return;
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}
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static int rxe_param_set_add(const char *val, const struct kernel_param *kp)
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{
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int len;
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int err = 0;
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char intf[32];
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struct net_device *ndev = NULL;
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struct rxe_dev *rxe;
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len = sanitize_arg(val, intf, sizeof(intf));
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if (!len) {
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pr_err("rxe: add: invalid interface name\n");
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err = -EINVAL;
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goto err;
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}
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ndev = dev_get_by_name(&init_net, intf);
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if (!ndev) {
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pr_err("interface %s not found\n", intf);
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err = -EINVAL;
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goto err;
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}
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if (net_to_rxe(ndev)) {
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pr_err("rxe: already configured on %s\n", intf);
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err = -EINVAL;
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goto err;
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}
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rxe = rxe_net_add(ndev);
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if (!rxe) {
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pr_err("rxe: failed to add %s\n", intf);
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err = -EINVAL;
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goto err;
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}
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rxe_set_port_state(ndev);
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pr_info("rxe: added %s to %s\n", rxe->ib_dev.name, intf);
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err:
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if (ndev)
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dev_put(ndev);
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return err;
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}
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static int rxe_param_set_remove(const char *val, const struct kernel_param *kp)
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{
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int len;
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char intf[32];
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struct rxe_dev *rxe;
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len = sanitize_arg(val, intf, sizeof(intf));
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if (!len) {
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pr_err("rxe: add: invalid interface name\n");
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return -EINVAL;
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}
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if (strncmp("all", intf, len) == 0) {
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pr_info("rxe_sys: remove all");
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rxe_remove_all();
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return 0;
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}
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rxe = get_rxe_by_name(intf);
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if (!rxe) {
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pr_err("rxe: not configured on %s\n", intf);
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return -EINVAL;
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}
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list_del(&rxe->list);
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rxe_remove(rxe);
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return 0;
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}
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static const struct kernel_param_ops rxe_add_ops = {
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.set = rxe_param_set_add,
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};
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static const struct kernel_param_ops rxe_remove_ops = {
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.set = rxe_param_set_remove,
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};
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module_param_cb(add, &rxe_add_ops, NULL, 0200);
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MODULE_PARM_DESC(add, "Create RXE device over network interface");
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module_param_cb(remove, &rxe_remove_ops, NULL, 0200);
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MODULE_PARM_DESC(remove, "Remove RXE device over network interface");
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