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Date: Wed, 5 Mar 2008 12:51:16 -0800 (PST)
From: therbert@...gle.com (Tom Herbert)
To: davem@...emloft.net, netdev@...r.kernel.org
Subject: RFC [PATCH net-2.6 6/6] net: softRSS net-sysfs
This patch implements per device sys-fs variables to set the CPU mask used for software RSS.
Signed-off-by: Tom Herbert <therbert@...gle.com>
---
diff -uprN -X /tmp/donts/rss_3 net-2.6/net/core/net-sysfs.c net-2.6.patch/net/core/net-sysfs.c
--- net-2.6/net/core/net-sysfs.c 2008-03-05 09:03:28.210553000 -0800
+++ net-2.6.patch/net/core/net-sysfs.c 2008-03-05 09:25:33.622754000 -0800
@@ -208,6 +208,81 @@ static ssize_t store_tx_queue_len(struct
return netdev_store(dev, attr, buf, len, change_tx_queue_len);
}
+
+#if defined(CONFIG_NET_NAPI_RSS) || defined(CONFIG_NET_SOFTRSS)
+static ssize_t netdev_store_cpumask(struct net_device *net, const char *buf,
+ size_t len, cpumask_t *maskp)
+{
+ cpumask_t new_value;
+ int err;
+
+ if (!capable(CAP_NET_ADMIN))
+ return -EPERM;
+
+ err = cpumask_parse(buf, len, new_value);
+ if (err)
+ return err;
+
+ rtnl_lock();
+ if (dev_isalive(net))
+ *maskp = new_value;
+ rtnl_unlock();
+
+ return len;
+}
+
+static ssize_t netdev_show_cpumask(struct net_device *net, char *buf,
+ cpumask_t *maskp)
+{
+ size_t len;
+ cpumask_t tmp;
+
+ read_lock(&dev_base_lock);
+ if (dev_isalive(net))
+ cpus_and(tmp, *maskp, cpu_online_map);
+ else
+ cpus_clear(tmp);
+ read_unlock(&dev_base_lock);
+
+ len = cpumask_scnprintf(buf, PAGE_SIZE, tmp);
+ if (PAGE_SIZE - len < 2)
+ return -EINVAL;
+
+ len += sprintf(buf + len, "\n");
+ return len;
+}
+#endif
+
+#ifdef CONFIG_NET_NAPI_RSS
+static ssize_t show_napi_rss_cpus(struct class_device *dev, char *buf)
+{
+ const struct net_device *net = to_net_dev(dev);
+ return (netdev_show_cpumask(net, buf, &net->napi_rss_cpus));
+}
+
+static ssize_t store_napi_rss_cpus(struct class_device *dev, const char *buf,
+ size_t len)
+{
+ const struct net_device *net = to_net_dev(dev);
+ return (netdev_store_cpumask(net, buf, len, &net->napi_rss_cpus));
+}
+#endif
+
+#ifdef CONFIG_NET_SOFTRSS
+static ssize_t show_soft_rss_cpus(struct class_device *dev, char *buf)
+{
+ const struct net_device *net = to_net_dev(dev);
+ return (netdev_show_cpumask(net, buf, &net->soft_rss_cpus));
+}
+
+static ssize_t store_soft_rss_cpus(struct class_device *dev, const char *buf,
+ size_t len)
+{
+ const struct net_device *net = to_net_dev(dev);
+ return (netdev_store_cpumask(net, buf, len, &net->soft_rss_cpus));
+}
+#endif
+
static struct device_attribute net_class_attributes[] = {
__ATTR(addr_len, S_IRUGO, show_addr_len, NULL),
__ATTR(iflink, S_IRUGO, show_iflink, NULL),
@@ -224,6 +299,14 @@ static struct device_attribute net_class
__ATTR(flags, S_IRUGO | S_IWUSR, show_flags, store_flags),
__ATTR(tx_queue_len, S_IRUGO | S_IWUSR, show_tx_queue_len,
store_tx_queue_len),
+#ifdef CONFIG_NET_NAPI_RSS
+ __ATTR(napi_rss_cpus, S_IRUGO | S_IWUSR, show_napi_rss_cpus,
+ store_napi_rss_cpus),
+#endif
+#ifdef CONFIG_NET_SOFTRSS
+ __ATTR(soft_rss_cpus, S_IRUGO | S_IWUSR, show_soft_rss_cpus,
+ store_soft_rss_cpus),
+#endif
{}
};
--
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