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Date: Tue, 13 Mar 2012 19:21:59 +0200
From: Amir Vadai <amirv@...lanox.com>
To: "David S. Miller" <davem@...emloft.net>
Cc: netdev@...r.kernel.org, Roland Dreier <roland@...estorage.com>,
Oren Duer <oren@...lanox.com>,
Amir Vadai <amirv@...lanox.co.il>
Subject: [PATCH 4/8] net/mlx4_en: Set max rate-limit for a TC
From: Amir Vadai <amirv@...lanox.co.il>
Set max rate-limit using sysfs file /sys/class/net/<interface>/qos/ratelimit
To set, enter a space separated list of values in units of 100Mbps. For
example to set ratelimit of 5G to TC0 and 10G for the reset on eth2 issue:
echo 50 100 100 100 100 100 100 100 100 > /sys/class/net/eth2/qos/ratelimit
Signed-off-by: Amir Vadai <amirv@...lanox.co.il>
---
We used sysfs since max bw isn't part of the ETS / DCBX NL support, and we're
open to other suggestions to add generic support for max bw, e.g add call to
the DCBX NL API.
drivers/net/ethernet/mellanox/mlx4/Makefile | 2 +-
drivers/net/ethernet/mellanox/mlx4/en_dcb_nl.c | 14 +++-
drivers/net/ethernet/mellanox/mlx4/en_netdev.c | 13 +++
drivers/net/ethernet/mellanox/mlx4/en_sysfs.c | 120 ++++++++++++++++++++++++
drivers/net/ethernet/mellanox/mlx4/mlx4_en.h | 5 +
5 files changed, 152 insertions(+), 2 deletions(-)
create mode 100644 drivers/net/ethernet/mellanox/mlx4/en_sysfs.c
diff --git a/drivers/net/ethernet/mellanox/mlx4/Makefile b/drivers/net/ethernet/mellanox/mlx4/Makefile
index 293127d..8e5bd88 100644
--- a/drivers/net/ethernet/mellanox/mlx4/Makefile
+++ b/drivers/net/ethernet/mellanox/mlx4/Makefile
@@ -7,4 +7,4 @@ obj-$(CONFIG_MLX4_EN) += mlx4_en.o
mlx4_en-y := en_main.o en_tx.o en_rx.o en_ethtool.o en_port.o en_cq.o \
en_resources.o en_netdev.o en_selftest.o
-mlx4_en-$(CONFIG_MLX4_EN_DCB) += en_dcb_nl.o
+mlx4_en-$(CONFIG_MLX4_EN_DCB) += en_dcb_nl.o en_sysfs.o
diff --git a/drivers/net/ethernet/mellanox/mlx4/en_dcb_nl.c b/drivers/net/ethernet/mellanox/mlx4/en_dcb_nl.c
index 24ca87c..eb0964f 100644
--- a/drivers/net/ethernet/mellanox/mlx4/en_dcb_nl.c
+++ b/drivers/net/ethernet/mellanox/mlx4/en_dcb_nl.c
@@ -126,7 +126,7 @@ mlx4_en_dcbnl_ieee_setets(struct net_device *dev, struct ieee_ets *ets)
return err;
err = mlx4_SET_PORT_SCHEDULER(mdev->dev, priv->port, tc_tx_bw, pg,
- NULL);
+ priv->ratelimit);
if (err)
return err;
@@ -192,6 +192,18 @@ static u8 mlx4_en_dcbnl_setdcbx(struct net_device *dev, u8 mode)
return 0;
}
+int mlx4_en_dcbnl_set_ratelimit(struct mlx4_en_priv *priv, u16 *ratelimit)
+{
+ memcpy(priv->ratelimit, ratelimit, sizeof(priv->ratelimit));
+
+ if (mlx4_en_dcbnl_ieee_setets(priv->dev, NULL)) {
+ en_err(priv, "Error setting ets in HW\n");
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
const struct dcbnl_rtnl_ops mlx4_en_dcbnl_ops = {
.ieee_getets = mlx4_en_dcbnl_ieee_getets,
.ieee_setets = mlx4_en_dcbnl_ieee_setets,
diff --git a/drivers/net/ethernet/mellanox/mlx4/en_netdev.c b/drivers/net/ethernet/mellanox/mlx4/en_netdev.c
index 9b456ae..f45d544 100644
--- a/drivers/net/ethernet/mellanox/mlx4/en_netdev.c
+++ b/drivers/net/ethernet/mellanox/mlx4/en_netdev.c
@@ -810,6 +810,18 @@ static void mlx4_en_restart(struct work_struct *work)
mutex_unlock(&mdev->state_lock);
}
+static int mlx4_en_init(struct net_device *dev)
+{
+#ifdef CONFIG_MLX4_EN_DCB
+ struct mlx4_en_priv *priv = netdev_priv(dev);
+
+ if (!mlx4_is_slave(priv->mdev->dev))
+ mlx4_en_prepare_sysfs_group(priv);
+#endif
+
+ return 0;
+}
+
static void mlx4_en_clear_stats(struct net_device *dev)
{
struct mlx4_en_priv *priv = netdev_priv(dev);
@@ -1026,6 +1038,7 @@ static int mlx4_en_set_features(struct net_device *netdev,
}
static const struct net_device_ops mlx4_netdev_ops = {
+ .ndo_init = mlx4_en_init,
.ndo_open = mlx4_en_open,
.ndo_stop = mlx4_en_close,
.ndo_start_xmit = mlx4_en_xmit,
diff --git a/drivers/net/ethernet/mellanox/mlx4/en_sysfs.c b/drivers/net/ethernet/mellanox/mlx4/en_sysfs.c
new file mode 100644
index 0000000..fdada20
--- /dev/null
+++ b/drivers/net/ethernet/mellanox/mlx4/en_sysfs.c
@@ -0,0 +1,120 @@
+/*
+ * Copyright (c) 2011 Mellanox Technologies. 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/device.h>
+#include <linux/netdevice.h>
+
+#include "mlx4_en.h"
+
+#define to_en_priv(cd) ((struct mlx4_en_priv *)(netdev_priv(to_net_dev(cd))))
+
+static ssize_t mlx4_en_show_ratelimit(struct device *d,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct mlx4_en_priv *priv = to_en_priv(d);
+ int i;
+ int len = 0;
+
+ for (i = 0; i < IEEE_8021QAZ_MAX_TCS; i++)
+ len += sprintf(buf + len, "%d ", priv->ratelimit[i]);
+ len += sprintf(buf + len, "\n");
+
+ return len;
+}
+
+static ssize_t mlx4_en_store_ratelimit(struct device *d,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ int ret = count;
+ struct mlx4_en_priv *priv = to_en_priv(d);
+ char save;
+ int i = 0;
+ u16 ratelimit[IEEE_8021QAZ_MAX_TCS] = { 0 };
+
+ do {
+ int len;
+ int new_value;
+
+ if (i >= IEEE_8021QAZ_MAX_TCS)
+ goto bad_elem_count;
+
+ len = strcspn(buf, " ");
+
+ /* nul-terminate and parse */
+ save = buf[len];
+ ((char *)buf)[len] = '\0';
+
+ if (sscanf(buf, "%d", &new_value) != 1 ||
+ new_value > 100 || new_value < 0) {
+ en_err(priv, "bad ratelimit value: '%s'\n", buf);
+ ret = -EINVAL;
+ goto out;
+ }
+ ratelimit[i] = new_value;
+
+ buf += len+1;
+ i++;
+ } while (save == ' ');
+
+ if (i != IEEE_8021QAZ_MAX_TCS)
+ goto bad_elem_count;
+
+ mlx4_en_dcbnl_set_ratelimit(priv, &ratelimit[0]);
+
+out:
+ return ret;
+
+bad_elem_count:
+ en_err(priv, "bad number of elemets in ratelimit array\n");
+ return -EINVAL;
+}
+
+static DEVICE_ATTR(ratelimit, S_IRUGO | S_IWUSR,
+ mlx4_en_show_ratelimit, mlx4_en_store_ratelimit);
+
+static struct attribute *mlx4_en_qos_attrs[] = {
+ &dev_attr_ratelimit.attr,
+ NULL,
+};
+
+static struct attribute_group qos_group = {
+ .name = "qos",
+ .attrs = mlx4_en_qos_attrs,
+};
+
+void mlx4_en_prepare_sysfs_group(struct mlx4_en_priv *priv)
+{
+ priv->dev->sysfs_groups[0] = &qos_group;
+}
diff --git a/drivers/net/ethernet/mellanox/mlx4/mlx4_en.h b/drivers/net/ethernet/mellanox/mlx4/mlx4_en.h
index fa09792..32b447d 100644
--- a/drivers/net/ethernet/mellanox/mlx4/mlx4_en.h
+++ b/drivers/net/ethernet/mellanox/mlx4/mlx4_en.h
@@ -499,6 +499,7 @@ struct mlx4_en_priv {
#ifdef CONFIG_MLX4_EN_DCB
struct ieee_ets *mlx4_en_ieee_ets;
+ u16 ratelimit[IEEE_8021QAZ_MAX_TCS];
#endif
};
@@ -576,6 +577,10 @@ int mlx4_en_QUERY_PORT(struct mlx4_en_dev *mdev, u8 port);
#ifdef CONFIG_MLX4_EN_DCB
extern const struct dcbnl_rtnl_ops mlx4_en_dcbnl_ops;
+
+void mlx4_en_prepare_sysfs_group(struct mlx4_en_priv *priv);
+
+int mlx4_en_dcbnl_set_ratelimit(struct mlx4_en_priv *priv, u16 *ratelimit);
#endif
#define MLX4_EN_NUM_SELF_TEST 5
--
1.7.8.2
--
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