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Date: Tue, 1 Dec 2015 08:01:29 +0000 From: kan.liang@...el.com To: netdev@...r.kernel.org, intel-wired-lan@...ts.osuosl.org, davem@...emloft.net Cc: jesse.brandeburg@...el.com, andi@...stfloor.org, jeffrey.t.kirsher@...el.com, shannon.nelson@...el.com, carolyn.wyborny@...el.com, donald.c.skidmore@...el.com, matthew.vick@...el.com, john.ronciak@...el.com, mitch.a.williams@...el.com, john.r.fastabend@...el.com, ogerlitz@...lanox.com, edumazet@...gle.com, jiri@...lanox.com, sfeldma@...il.com, gospo@...ulusnetworks.com, sasha.levin@...cle.com, f.fainelli@...il.com, dsahern@...il.com, tj@...nel.org, cascardo@...hat.com, corbet@....net, Kan Liang <kan.liang@...el.com> Subject: [RFC 1/4] net: support per queue tx_usecs in sysfs From: Kan Liang <kan.liang@...el.com> Network devices usually have many queues. Each queue has its own tx_usecs options. Currently, we can only set all the queues with same value by ethtool. This patch expose the tx_usecs in sysfs. So the user can set/get per queue coalesce parameter tx_usecs by sysfs. Signed-off-by: Kan Liang <kan.liang@...el.com> --- Documentation/networking/scaling.txt | 12 ++++++++++++ include/linux/netdevice.h | 8 ++++++++ net/core/net-sysfs.c | 38 ++++++++++++++++++++++++++++++++++++ 3 files changed, 58 insertions(+) diff --git a/Documentation/networking/scaling.txt b/Documentation/networking/scaling.txt index 59f4db2..636192d 100644 --- a/Documentation/networking/scaling.txt +++ b/Documentation/networking/scaling.txt @@ -431,6 +431,18 @@ a max-rate attribute is supported, by setting a Mbps value to A value of zero means disabled, and this is the default. +Per Queue interrupt moderation: +============================= + +The interrupt moderation mechanism, which implemented by HW, employs +a series of timers to limit the number of interrupts it generates. +TX queue absolute delay timer can be set to a microseconds value with + +/sys/class/net/<dev>/queues/tx-<n>/tx_usecs + +For the device which doesn't support per queue interrupt moderation, +it shows "N/A". + Further Information =================== RPS and RFS were introduced in kernel 2.6.35. XPS was incorporated into diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h index 7d2d1d7..9db5c57 100644 --- a/include/linux/netdevice.h +++ b/include/linux/netdevice.h @@ -1059,6 +1059,10 @@ typedef u16 (*select_queue_fallback_t)(struct net_device *dev, * This function is used to get egress tunnel information for given skb. * This is useful for retrieving outer tunnel header parameters while * sampling packet. + * void (*ndo_set_per_queue_tx_usecs)(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. * */ struct net_device_ops { @@ -1236,6 +1240,10 @@ struct net_device_ops { bool proto_down); int (*ndo_fill_metadata_dst)(struct net_device *dev, struct sk_buff *skb); + void (*ndo_set_per_queue_tx_usecs)(struct net_device *dev, + int index, u32 val); + u32 (*ndo_get_per_queue_tx_usecs)(struct net_device *dev, + int index); }; /** diff --git a/net/core/net-sysfs.c b/net/core/net-sysfs.c index f88a62a..48016b8 100644 --- a/net/core/net-sysfs.c +++ b/net/core/net-sysfs.c @@ -1239,12 +1239,50 @@ static struct netdev_queue_attribute xps_cpus_attribute = __ATTR(xps_cpus, S_IRUGO | S_IWUSR, show_xps_map, store_xps_map); #endif /* CONFIG_XPS */ +static ssize_t tx_usecs_show(struct netdev_queue *queue, + struct netdev_queue_attribute *attr, + char *buf) +{ + struct net_device *dev = queue->dev; + int index = queue - dev->_tx; + u32 val; + + if (dev->netdev_ops->ndo_get_per_queue_tx_usecs) { + val = dev->netdev_ops->ndo_get_per_queue_tx_usecs(dev, index); + return sprintf(buf, "%u\n", val); + } + + return sprintf(buf, "N/A\n"); +} + +static ssize_t tx_usecs_store(struct netdev_queue *queue, + struct netdev_queue_attribute *attr, + const char *buf, size_t len) +{ + struct net_device *dev = queue->dev; + int index = queue - dev->_tx; + u32 val, ret; + + ret = kstrtouint(buf, 0, &val); + if (ret < 0) + return -EINVAL; + + if (dev->netdev_ops->ndo_set_per_queue_tx_usecs) + dev->netdev_ops->ndo_set_per_queue_tx_usecs(dev, index, val); + + return len; +} + +static struct netdev_queue_attribute tx_usecs_attribute = + __ATTR(tx_usecs, S_IRUGO | S_IWUSR, tx_usecs_show, tx_usecs_store); + static struct attribute *netdev_queue_default_attrs[] = { &queue_trans_timeout.attr, #ifdef CONFIG_XPS &xps_cpus_attribute.attr, &queue_tx_maxrate.attr, #endif + &tx_usecs_attribute.attr, NULL }; -- 1.7.11.7 -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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