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USBNET: centralize computing of max rx/tx qlen
This patch centralizes computing of max rx/tx qlen, because: - RX_QLEN()/TX_QLEN() is called in hot path - computing depends on device's usb speed, now we have ls/fs, hs, ss, so more checks need to be involved - in fact, max rx/tx qlen should not only depend on device USB speed, but also depend on ethernet link speed, so we need to consider that in future. - if SG support is done, max tx qlen may need change too Generally, hard_mtu and rx_urb_size are changed in bind(), reset() and link_reset() callback, and change mtu network operation, this patches introduces the API of usbnet_update_max_qlen(), and calls it in above path. Signed-off-by: Ming Lei <ming.lei@canonical.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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6680ec68ef
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a88c32ae15
4 changed files with 46 additions and 8 deletions
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@ -778,6 +778,9 @@ static int ax88178_change_mtu(struct net_device *net, int new_mtu)
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dev->hard_mtu = net->mtu + net->hard_header_len;
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ax88178_set_mfb(dev);
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/* max qlen depend on hard_mtu and rx_urb_size */
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usbnet_update_max_qlen(dev);
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return 0;
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}
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@ -688,6 +688,9 @@ static int ax88179_change_mtu(struct net_device *net, int new_mtu)
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2, 2, &tmp16);
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}
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/* max qlen depend on hard_mtu and rx_urb_size */
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usbnet_update_max_qlen(dev);
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return 0;
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}
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@ -59,15 +59,13 @@
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* For high speed, each frame comfortably fits almost 36 max size
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* Ethernet packets (so queues should be bigger).
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*
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* REVISIT qlens should be members of 'struct usbnet'; the goal is to
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* let the USB host controller be busy for 5msec or more before an irq
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* is required, under load. Jumbograms change the equation.
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* The goal is to let the USB host controller be busy for 5msec or
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* more before an irq is required, under load. Jumbograms change
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* the equation.
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*/
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#define RX_MAX_QUEUE_MEMORY (60 * 1518)
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#define RX_QLEN(dev) (((dev)->udev->speed == USB_SPEED_HIGH) ? \
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(RX_MAX_QUEUE_MEMORY/(dev)->rx_urb_size) : 4)
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#define TX_QLEN(dev) (((dev)->udev->speed == USB_SPEED_HIGH) ? \
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(RX_MAX_QUEUE_MEMORY/(dev)->hard_mtu) : 4)
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#define MAX_QUEUE_MEMORY (60 * 1518)
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#define RX_QLEN(dev) ((dev)->rx_qlen)
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#define TX_QLEN(dev) ((dev)->tx_qlen)
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// reawaken network queue this soon after stopping; else watchdog barks
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#define TX_TIMEOUT_JIFFIES (5*HZ)
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@ -347,6 +345,22 @@ void usbnet_skb_return (struct usbnet *dev, struct sk_buff *skb)
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}
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EXPORT_SYMBOL_GPL(usbnet_skb_return);
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/* must be called if hard_mtu or rx_urb_size changed */
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void usbnet_update_max_qlen(struct usbnet *dev)
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{
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enum usb_device_speed speed = dev->udev->speed;
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switch (speed) {
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case USB_SPEED_HIGH:
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dev->rx_qlen = MAX_QUEUE_MEMORY / dev->rx_urb_size;
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dev->tx_qlen = MAX_QUEUE_MEMORY / dev->hard_mtu;
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break;
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default:
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dev->rx_qlen = dev->tx_qlen = 4;
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}
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}
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EXPORT_SYMBOL_GPL(usbnet_update_max_qlen);
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/*-------------------------------------------------------------------------
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*
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@ -375,6 +389,9 @@ int usbnet_change_mtu (struct net_device *net, int new_mtu)
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usbnet_unlink_rx_urbs(dev);
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}
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/* max qlen depend on hard_mtu and rx_urb_size */
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usbnet_update_max_qlen(dev);
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return 0;
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}
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EXPORT_SYMBOL_GPL(usbnet_change_mtu);
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@ -843,6 +860,9 @@ int usbnet_open (struct net_device *net)
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goto done;
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}
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/* hard_mtu or rx_urb_size may change in reset() */
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usbnet_update_max_qlen(dev);
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// insist peer be connected
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if (info->check_connect && (retval = info->check_connect (dev)) < 0) {
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netif_dbg(dev, ifup, dev->net, "can't open; %d\n", retval);
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@ -927,6 +947,9 @@ int usbnet_set_settings (struct net_device *net, struct ethtool_cmd *cmd)
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if (dev->driver_info->link_reset)
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dev->driver_info->link_reset(dev);
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/* hard_mtu or rx_urb_size may change in link_reset() */
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usbnet_update_max_qlen(dev);
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return retval;
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}
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@ -1020,6 +1043,9 @@ static void __handle_link_change(struct usbnet *dev)
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tasklet_schedule(&dev->bh);
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}
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/* hard_mtu or rx_urb_size may change during link change */
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usbnet_update_max_qlen(dev);
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clear_bit(EVENT_LINK_CHANGE, &dev->flags);
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}
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@ -1599,6 +1625,9 @@ usbnet_probe (struct usb_interface *udev, const struct usb_device_id *prod)
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if ((dev->driver_info->flags & FLAG_WWAN) != 0)
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SET_NETDEV_DEVTYPE(net, &wwan_type);
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/* initialize max rx_qlen and tx_qlen */
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usbnet_update_max_qlen(dev);
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status = register_netdev (net);
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if (status)
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goto out4;
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@ -34,6 +34,7 @@ struct usbnet {
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struct mutex phy_mutex;
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unsigned char suspend_count;
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unsigned char pkt_cnt, pkt_err;
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unsigned short rx_qlen, tx_qlen;
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/* i/o info: pipes etc */
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unsigned in, out;
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@ -253,4 +254,6 @@ extern void usbnet_link_change(struct usbnet *, bool, bool);
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extern int usbnet_status_start(struct usbnet *dev, gfp_t mem_flags);
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extern void usbnet_status_stop(struct usbnet *dev);
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extern void usbnet_update_max_qlen(struct usbnet *dev);
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#endif /* __LINUX_USB_USBNET_H */
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