From: Kan Liang <kan.li...@intel.com>
Network devices usually have many queues. Each queue has its own
rx_usecs options. Currently, we can only set all the queues with same
value by ethtool. This patch expose the rx_usecs in sysfs. So the user
can set/get per queue coalesce parameter rx_usecs by sysfs.
Signed-off-by: Kan Liang <kan.li...@intel.com>
---
Documentation/networking/scaling.txt | 4 ++++
include/linux/netdevice.h | 8 ++++++++
net/core/net-sysfs.c | 36 ++++++++++++++++++++++++++++++++++++
3 files changed, 48 insertions(+)
diff --git a/Documentation/networking/scaling.txt
b/Documentation/networking/scaling.txt
index 636192d..218429c 100644
--- a/Documentation/networking/scaling.txt
+++ b/Documentation/networking/scaling.txt
@@ -440,6 +440,10 @@ TX queue absolute delay timer can be set to a microseconds
value with
/sys/class/net/<dev>/queues/tx-<n>/tx_usecs
+RX queue absolute delay timer can be set to a microseconds value with
+
+/sys/class/net/<dev>/queues/rx-<n>/rx_usecs
+
For the device which doesn't support per queue interrupt moderation,
it shows "N/A".
diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index 9db5c57..45a0054 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -1063,6 +1063,10 @@ typedef u16 (*select_queue_fallback_t)(struct net_device
*dev,
* int index, u32 val);
* void (*ndo_get_per_queue_tx_usecs)(struct net_device *dev, int index);
* This function is used to set/get per queue coalesce parameter tx_usecs.
+ * void (*ndo_set_per_queue_rx_usecs)(struct net_device *dev,
+ * int index, u32 val);
+ * void (*ndo_get_per_queue_rx_usecs)(struct net_device *dev, int index);
+ * This function is used to set/get per queue coalesce parameter rx_usecs.
*
*/
struct net_device_ops {
@@ -1244,6 +1248,10 @@ struct net_device_ops {
int index, u32
val);
u32 (*ndo_get_per_queue_tx_usecs)(struct net_device
*dev,
int index);
+ void (*ndo_set_per_queue_rx_usecs)(struct net_device
*dev,
+ int index, u32
val);
+ u32 (*ndo_get_per_queue_rx_usecs)(struct net_device
*dev,
+ int index);
};
/**
diff --git a/net/core/net-sysfs.c b/net/core/net-sysfs.c
index 48016b8..ab08b2b 100644
--- a/net/core/net-sysfs.c
+++ b/net/core/net-sysfs.c
@@ -831,11 +831,47 @@ static struct rx_queue_attribute
rps_dev_flow_table_cnt_attribute =
show_rps_dev_flow_table_cnt, store_rps_dev_flow_table_cnt);
#endif /* CONFIG_RPS */
+static ssize_t rx_usecs_show(struct netdev_rx_queue *queue,
+ struct rx_queue_attribute *attribute, char *buf)
+{
+ struct net_device *dev = queue->dev;
+ int index = queue - dev->_rx;
+ u32 val;
+
+ if (dev->netdev_ops->ndo_get_per_queue_rx_usecs) {
+ val = dev->netdev_ops->ndo_get_per_queue_rx_usecs(dev, index);
+ return sprintf(buf, "%u\n", val);
+ }
+ return sprintf(buf, "N/A\n");
+}
+
+static ssize_t rx_usecs_store(struct netdev_rx_queue *queue,
+ struct rx_queue_attribute *attribute,
+ const char *buf, size_t len)
+{
+ struct net_device *dev = queue->dev;
+ int index = queue - dev->_rx;
+ u32 val, ret;
+
+ ret = kstrtouint(buf, 0, &val);
+ if (ret < 0)
+ return -EINVAL;
+
+ if (dev->netdev_ops->ndo_set_per_queue_rx_usecs)
+ dev->netdev_ops->ndo_set_per_queue_rx_usecs(dev, index, val);
+
+ return len;
+}
+
+static struct rx_queue_attribute rx_usecs_attribute =
+ __ATTR(rx_usecs, S_IRUGO | S_IWUSR, rx_usecs_show, rx_usecs_store);
+
static struct attribute *rx_queue_default_attrs[] = {
#ifdef CONFIG_RPS
&rps_cpus_attribute.attr,
&rps_dev_flow_table_cnt_attribute.attr,
#endif
+ &rx_usecs_attribute.attr,
NULL
};
--
1.7.11.7
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