mirror of
https://github.com/Ysurac/openmptcprouter.git
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61 lines
2.2 KiB
Diff
61 lines
2.2 KiB
Diff
From 83a7626762865edd0bb5112eee1750bbfa30e0a7 Mon Sep 17 00:00:00 2001
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From: Dave Stevenson <dave.stevenson@raspberrypi.org>
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Date: Wed, 13 Jun 2018 15:21:10 +0100
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Subject: [PATCH 146/726] net: lan78xx: Disable TCP Segmentation Offload (TSO)
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TSO seems to be having issues when packets are dropped and the
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remote end uses Selective Acknowledge (SACK) to denote that
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data is missing. The missing data is never resent, so the
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connection eventually stalls.
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There is a module parameter of enable_tso added to allow
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further debugging without forcing a rebuild of the kernel.
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https://github.com/raspberrypi/linux/issues/2449
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https://github.com/raspberrypi/linux/issues/2482
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Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.org>
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---
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drivers/net/usb/lan78xx.c | 19 +++++++++++++++++--
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1 file changed, 17 insertions(+), 2 deletions(-)
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diff --git a/drivers/net/usb/lan78xx.c b/drivers/net/usb/lan78xx.c
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index 3ccf48ccd08c..dae2c83a861f 100644
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--- a/drivers/net/usb/lan78xx.c
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+++ b/drivers/net/usb/lan78xx.c
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@@ -609,6 +609,15 @@ static int lan78xx_alloc_tx_resources(struct lan78xx_net *dev)
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dev->n_tx_urbs, dev->tx_urb_size, dev);
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}
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+/* TSO seems to be having some issue with Selective Acknowledge (SACK) that
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+ * results in lost data never being retransmitted.
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+ * Disable it by default now, but adds a module parameter to enable it for
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+ * debug purposes (the full cause is not currently understood).
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+ */
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+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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+
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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;
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@@ -3492,8 +3501,14 @@ static int lan78xx_bind(struct lan78xx_net *dev, struct usb_interface *intf)
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if (DEFAULT_RX_CSUM_ENABLE)
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dev->net->features |= NETIF_F_RXCSUM;
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- if (DEFAULT_TSO_CSUM_ENABLE)
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- dev->net->features |= NETIF_F_TSO | NETIF_F_TSO6 | NETIF_F_SG;
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+ if (DEFAULT_TSO_CSUM_ENABLE) {
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+ dev->net->features |= NETIF_F_SG;
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+ /* Use module parameter to control TCP segmentation offload as
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+ * it appears to cause issues.
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+ */
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+ if (enable_tso)
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+ dev->net->features |= NETIF_F_TSO | NETIF_F_TSO6;
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+ }
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if (DEFAULT_VLAN_RX_OFFLOAD)
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dev->net->features |= NETIF_F_HW_VLAN_CTAG_RX;
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--
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2.33.1
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