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From 44c28420145101c846b445b8ae6159400909f69f Mon Sep 17 00:00:00 2001
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From: Joshua Emele <jemele@acm.org>
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Date: Wed, 7 Nov 2018 16:07:40 -0800
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Subject: [PATCH 454/454] lan78xx: Debounce link events to minimize poll storm
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The bInterval is set to 4 (i.e. 8 microframes => 1ms) and the only bit
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that the driver pays attention to is "link was reset". If there's a
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flapping status bit in that endpoint data, (such as if PHY negotiation
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needs a few tries to get a stable link) then polling at a slower rate
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would act as a de-bounce.
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See: https://github.com/raspberrypi/linux/issues/2447
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---
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drivers/net/usb/lan78xx.c | 12 +++++++++++-
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1 file changed, 11 insertions(+), 1 deletion(-)
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--- a/drivers/net/usb/lan78xx.c
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+++ b/drivers/net/usb/lan78xx.c
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@@ -425,6 +425,11 @@ static bool enable_tso;
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module_param(enable_tso, bool, 0644);
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MODULE_PARM_DESC(enable_tso, "Enables TCP segmentation offload");
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+#define INT_URB_MICROFRAMES_PER_MS 8
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+static int int_urb_interval_ms = 8;
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+module_param(int_urb_interval_ms, int, 0);
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+MODULE_PARM_DESC(int_urb_interval_ms, "Override usb interrupt urb interval");
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+
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static int lan78xx_read_reg(struct lan78xx_net *dev, u32 index, u32 *data)
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{
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u32 *buf = kmalloc(sizeof(u32), GFP_KERNEL);
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@@ -3714,7 +3719,12 @@ static int lan78xx_probe(struct usb_inte
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dev->pipe_intr = usb_rcvintpipe(dev->udev,
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dev->ep_intr->desc.bEndpointAddress &
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USB_ENDPOINT_NUMBER_MASK);
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- period = dev->ep_intr->desc.bInterval;
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+ if (int_urb_interval_ms <= 0)
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+ period = dev->ep_intr->desc.bInterval;
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+ else
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+ period = int_urb_interval_ms * INT_URB_MICROFRAMES_PER_MS;
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+
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+ netif_notice(dev, probe, netdev, "int urb period %d\n", period);
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maxp = usb_maxpacket(dev->udev, dev->pipe_intr, 0);
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buf = kmalloc(maxp, GFP_KERNEL);
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