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Subject[PATCH 1/2] net: core: ethtool: add per queue bandwidth command
Date
Signed-off-by: Ivan Khoronzhuk <ivan.khoronzhuk@linaro.org>
---
include/linux/ethtool.h | 4 ++
include/uapi/linux/ethtool.h | 2 +
net/core/ethtool.c | 102 +++++++++++++++++++++++++++++++++++++++++++
3 files changed, 108 insertions(+)

diff --git a/include/linux/ethtool.h b/include/linux/ethtool.h
index 9ded8c6..7e64c17 100644
--- a/include/linux/ethtool.h
+++ b/include/linux/ethtool.h
@@ -273,6 +273,8 @@ bool ethtool_convert_link_mode_to_legacy_u32(u32 *legacy_u32,
* a TX queue has this number, return -EINVAL. If only a RX queue or a TX
* queue has this number, ignore the inapplicable fields.
* Returns a negative error code or zero.
+ * @get_per_queue_bandwidth: get per-queue bandwidth
+ * @set_per_queue_bandwidth: set per-queue bandwidth
* @get_link_ksettings: When defined, takes precedence over the
* %get_settings method. Get various device settings
* including Ethernet link settings. The %cmd and
@@ -368,6 +370,8 @@ struct ethtool_ops {
struct ethtool_coalesce *);
int (*set_per_queue_coalesce)(struct net_device *, u32,
struct ethtool_coalesce *);
+ int (*get_per_queue_bandwidth)(struct net_device *, u32, int *);
+ int (*set_per_queue_bandwidth)(struct net_device *, u32, int);
int (*get_link_ksettings)(struct net_device *,
struct ethtool_link_ksettings *);
int (*set_link_ksettings)(struct net_device *,
diff --git a/include/uapi/linux/ethtool.h b/include/uapi/linux/ethtool.h
index b8f38e8..0fcfe9e 100644
--- a/include/uapi/linux/ethtool.h
+++ b/include/uapi/linux/ethtool.h
@@ -1314,6 +1314,8 @@ struct ethtool_per_queue_op {

#define ETHTOOL_GLINKSETTINGS 0x0000004c /* Get ethtool_link_settings */
#define ETHTOOL_SLINKSETTINGS 0x0000004d /* Set ethtool_link_settings */
+#define ETHTOOL_GBANDWIDTH 0x0000004e /* Get ethtool per queue bandwidth */
+#define ETHTOOL_SBANDWIDTH 0x0000004f /* Set ethtool per queue bandwidth */


/* compatibility with older code */
diff --git a/net/core/ethtool.c b/net/core/ethtool.c
index 9774898..f31d539 100644
--- a/net/core/ethtool.c
+++ b/net/core/ethtool.c
@@ -2346,6 +2346,102 @@ static int ethtool_get_per_queue_coalesce(struct net_device *dev,
return 0;
}

+static int
+ethtool_get_per_queue_bandwidth(struct net_device *dev,
+ void __user *useraddr,
+ struct ethtool_per_queue_op *per_queue_opt)
+{
+ u32 bit;
+ int ret;
+ DECLARE_BITMAP(queue_mask, MAX_NUM_QUEUE);
+
+ if (!dev->ethtool_ops->get_per_queue_bandwidth)
+ return -EOPNOTSUPP;
+
+ useraddr += sizeof(*per_queue_opt);
+
+ bitmap_from_u32array(queue_mask,
+ MAX_NUM_QUEUE,
+ per_queue_opt->queue_mask,
+ DIV_ROUND_UP(MAX_NUM_QUEUE, 32));
+
+ for_each_set_bit(bit, queue_mask, MAX_NUM_QUEUE) {
+ int bandwidth;
+
+ ret = dev->ethtool_ops->get_per_queue_bandwidth(dev, bit,
+ &bandwidth);
+ if (ret != 0)
+ return ret;
+ if (copy_to_user(useraddr, &bandwidth, sizeof(bandwidth)))
+ return -EFAULT;
+ useraddr += sizeof(bandwidth);
+ }
+
+ return 0;
+}
+
+static int
+ethtool_set_per_queue_bandwidth(struct net_device *dev,
+ void __user *useraddr,
+ struct ethtool_per_queue_op *per_queue_opt)
+{
+ u32 bit;
+ int n_queue;
+ int i, ret = 0;
+ int *backup = NULL, *tmp = NULL;
+ DECLARE_BITMAP(queue_mask, MAX_NUM_QUEUE);
+
+ if ((!dev->ethtool_ops->set_per_queue_bandwidth) ||
+ (!dev->ethtool_ops->get_per_queue_bandwidth))
+ return -EOPNOTSUPP;
+
+ useraddr += sizeof(*per_queue_opt);
+
+ bitmap_from_u32array(queue_mask,
+ MAX_NUM_QUEUE,
+ per_queue_opt->queue_mask,
+ DIV_ROUND_UP(MAX_NUM_QUEUE, 32));
+ n_queue = bitmap_weight(queue_mask, MAX_NUM_QUEUE);
+ tmp = kmalloc_array(n_queue, sizeof(*backup), GFP_KERNEL);
+ if (!tmp)
+ return -ENOMEM;
+ backup = tmp;
+
+ for_each_set_bit(bit, queue_mask, MAX_NUM_QUEUE) {
+ int bandwidth;
+
+ ret = dev->ethtool_ops->get_per_queue_bandwidth(dev, bit, tmp);
+ if (ret != 0)
+ goto roll_back;
+
+ tmp++;
+
+ if (copy_from_user(&bandwidth, useraddr, sizeof(bandwidth))) {
+ ret = -EFAULT;
+ goto roll_back;
+ }
+
+ ret = dev->ethtool_ops->set_per_queue_bandwidth(dev, bit,
+ bandwidth);
+ if (ret != 0)
+ goto roll_back;
+
+ useraddr += sizeof(bandwidth);
+ }
+
+roll_back:
+ if (ret != 0) {
+ tmp = backup;
+ for_each_set_bit(i, queue_mask, bit) {
+ dev->ethtool_ops->set_per_queue_bandwidth(dev, i, *tmp);
+ tmp++;
+ }
+ }
+ kfree(backup);
+
+ return ret;
+}
+
static int ethtool_set_per_queue_coalesce(struct net_device *dev,
void __user *useraddr,
struct ethtool_per_queue_op *per_queue_opt)
@@ -2417,6 +2513,12 @@ static int ethtool_set_per_queue(struct net_device *dev, void __user *useraddr)
return ethtool_get_per_queue_coalesce(dev, useraddr, &per_queue_opt);
case ETHTOOL_SCOALESCE:
return ethtool_set_per_queue_coalesce(dev, useraddr, &per_queue_opt);
+ case ETHTOOL_GBANDWIDTH:
+ return ethtool_get_per_queue_bandwidth(dev, useraddr,
+ &per_queue_opt);
+ case ETHTOOL_SBANDWIDTH:
+ return ethtool_set_per_queue_bandwidth(dev, useraddr,
+ &per_queue_opt);
default:
return -EOPNOTSUPP;
};
--
1.9.1
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