[PATCH rdma-next 27/29] IB/rxe: sysfs interface to RXE

Moni Shoua
2016-06-02T16:57:35Z

Add sysfs interface for Soft RoCE, mainly for binding the Soft RoCE
driver with an Ethernet net device.

Signed-off-by: Kamal Heib <kamalh-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
Signed-off-by: Amir Vadai <amirv-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
Signed-off-by: Moni Shoua <monis-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
Reviewed-by: Haggai Eran <haggaie-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
---
drivers/infiniband/hw/rxe/rxe_sysfs.c | 151 ++++++++++++++++++++++++++++++++++
1 file changed, 151 insertions(+)
create mode 100644 drivers/infiniband/hw/rxe/rxe_sysfs.c

diff --git a/drivers/infiniband/hw/rxe/rxe_sysfs.c b/drivers/infiniband/hw/rxe/rxe_sysfs.c
new file mode 100644
index 0000000..4aa0c59
--- /dev/null
+++ b/drivers/infiniband/hw/rxe/rxe_sysfs.c
@@ -0,0 +1,151 @@
+/*
+ * Copyright (c) 2016 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.h"
+#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 *rxe;
+
+ rxe = net_to_rxe(ndev);
+ if (!rxe)
+ 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 && (!strncmp(intf, ndev->name, len))) {
+ spin_unlock_bh(&net_info_lock);
+ if (net_info[i].rxe)
+ pr_info("rxe: already configured on %s\n",
+ intf);
+ else {
+ err = rxe_net_add(ndev);
+ if (!err && net_info[i].rxe) {
+ 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 int rxe_param_set_remove(const char *val, struct kernel_param *kp)
+{
+ int i, len;
+ char intf[32];
+ struct rxe_dev *rxe;
+
+ len = sanitize_arg(val, intf, sizeof(intf));
+ if (!len) {
+ pr_err("rxe: remove: invalid interface name\n");
+ return -EINVAL;
+ }
+
+ if (strncmp("all", intf, len) == 0) {
+ pr_info("rxe_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].rxe || !net_info[i].ndev)
+ continue;
+
+ if (!strncmp(intf, net_info[i].rxe->ib_dev.name, len)) {
+ rxe = net_info[i].rxe;
+ net_info[i].rxe = NULL;
+ spin_unlock_bh(&net_info_lock);
+
+ rxe_remove(rxe);
+ return 0;
+ }
+ }
+ spin_unlock_bh(&net_info_lock);
+ pr_warn("rxe_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);
--
1.8.3.1