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Subject[PATCH] r8169: don't use MSI-X on RTL8106e
Date
From: Jian-Hong Pan <jian-hong@endlessm.com>

Found the ethernet network on ASUS X441UAR doesn't come back on resume
from suspend when using MSI-X. The chip is RTL8106e - version 39.

asus@endless:~$ dmesg | grep r8169
[ 21.848357] libphy: r8169: probed
[ 21.848473] r8169 0000:02:00.0 eth0: RTL8106e, 0c:9d:92:32:67:b4, XID
44900000, IRQ 127
[ 22.518860] r8169 0000:02:00.0 enp2s0: renamed from eth0
[ 29.458041] Generic PHY r8169-200:00: attached PHY driver [Generic
PHY] (mii_bus:phy_addr=r8169-200:00, irq=IGNORE)
[ 63.227398] r8169 0000:02:00.0 enp2s0: Link is Up - 100Mbps/Full -
flow control off
[ 124.514648] Generic PHY r8169-200:00: attached PHY driver [Generic
PHY] (mii_bus:phy_addr=r8169-200:00, irq=IGNORE)

Here is the ethernet controller in detail:

asus@endless:~$ sudo lspci -nnvs 02:00.0
[sudo] password for asus:
02:00.0 Ethernet controller [0200]: Realtek Semiconductor Co., Ltd.
RTL8101/2/6E PCI Express Fast/Gigabit Ethernet controller [10ec:8136]
(rev 07)
Subsystem: ASUSTeK Computer Inc. RTL810xE PCI Express Fast
Ethernet controller [1043:200f]
Flags: bus master, fast devsel, latency 0, IRQ 16
I/O ports at e000 [size=256]
Memory at ef100000 (64-bit, non-prefetchable) [size=4K]
Memory at e0000000 (64-bit, prefetchable) [size=16K]
Capabilities: [40] Power Management version 3
Capabilities: [50] MSI: Enable- Count=1/1 Maskable- 64bit+
Capabilities: [70] Express Endpoint, MSI 01
Capabilities: [b0] MSI-X: Enable+ Count=4 Masked-
Capabilities: [d0] Vital Product Data
Capabilities: [100] Advanced Error Reporting
Capabilities: [140] Virtual Channel
Capabilities: [160] Device Serial Number 01-00-00-00-36-4c-e0-00
Capabilities: [170] Latency Tolerance Reporting
Kernel driver in use: r8169
Kernel modules: r8169

Here is the system interrupt table:

asus@endless:~$ cat /proc/interrupts
CPU0 CPU1 CPU2 CPU3
0: 22 0 0 0 IO-APIC 2-edge
timer
1: 157 42 0 0 IO-APIC 1-edge
i8042
8: 0 0 1 0 IO-APIC 8-edge
rtc0
9: 10 13 0 0 IO-APIC 9-fasteoi
acpi
16: 0 0 0 0 IO-APIC 16-fasteoi
i2c_designware.0, i801_smbus
17: 2445 0 3453 0 IO-APIC 17-fasteoi
i2c_designware.1, rtl_pci
109: 2 0 0 1 IO-APIC 109-fasteoi
FTE1200:00
120: 0 0 0 0 PCI-MSI 458752-edge
PCIe PME
121: 0 0 0 0 PCI-MSI 466944-edge
PCIe PME
122: 0 0 0 0 PCI-MSI 468992-edge
PCIe PME
123: 1465 0 0 21263 PCI-MSI 376832-edge
ahci[0000:00:17.0]
124: 0 530 0 0 PCI-MSI 327680-edge
xhci_hcd
125: 5204 0 0 0 PCI-MSI 32768-edge
i915
126: 0 0 149 0 PCI-MSI 514048-edge
snd_hda_intel:card0
127: 0 0 337 0 PCI-MSI 1048576-edge
enp2s0
NMI: 0 0 0 0 Non-maskable
interrupts
LOC: 45049 39474 38978 46677 Local timer
interrupts
SPU: 0 0 0 0 Spurious interrupts
PMI: 0 0 0 0 Performance
monitoring interrupts
IWI: 619 8 0 1 IRQ work interrupts
RTR: 6 0 0 0 APIC ICR read
retries
RES: 4918 4436 3835 2943 Rescheduling
interrupts
CAL: 1399 1478 1598 1465 Function call
interrupts
TLB: 608 513 723 559 TLB shootdowns
TRM: 0 0 0 0 Thermal event
interrupts
THR: 0 0 0 0 Threshold APIC
interrupts
DFR: 0 0 0 0 Deferred Error APIC
interrupts
MCE: 0 0 0 0 Machine check
exceptions
MCP: 3 4 4 4 Machine check polls
ERR: 0
MIS: 0
PIN: 0 0 0 0 Posted-interrupt
notification event
NPI: 0 0 0 0 Nested
posted-interrupt event
PIW: 0 0 0 0 Posted-interrupt
wakeup event

It is the IRQ 127 - PCI-MSI used by enp2s0. However, lspci lists MSI is
disabled and MSI-X is enabled which conflicts to the interrupt table.

Falling back to MSI fixes the issue.

Here is the test result with this patch in dmesg:

asus@endless:~$ dmesg | grep r8169
[ 22.017477] libphy: r8169: probed
[ 22.017735] r8169 0000:02:00.0 eth0: RTL8106e, 0c:9d:92:32:67:b4, XID
44900000, IRQ 127
[ 22.041489] r8169 0000:02:00.0 enp2s0: renamed from eth0
[ 29.138312] Generic PHY r8169-200:00: attached PHY driver [Generic
PHY] (mii_bus:phy_addr=r8169-200:00, irq=IGNORE)
[ 30.927359] r8169 0000:02:00.0 enp2s0: Link is Up - 100Mbps/Full -
flow control off
[ 289.998077] r8169 0000:02:00.0 enp2s0: Link is Up - 100Mbps/Full -
flow control off
[ 290.508084] Generic PHY r8169-200:00: attached PHY driver [Generic
PHY] (mii_bus:phy_addr=r8169-200:00, irq=IGNORE)
[ 290.745690] r8169 0000:02:00.0 enp2s0: Link is Down
[ 292.367717] r8169 0000:02:00.0 enp2s0: Link is Up - 100Mbps/Full -
flow control off

lspci lists MSI is enabled and MSI-X is disabled with this patch:

asus@endless:~/linux-net$ sudo lspci -nnvs 02:00.0
[sudo] password for asus:
02:00.0 Ethernet controller [0200]: Realtek Semiconductor Co., Ltd.
RTL8101/2/6E PCI Express Fast/Gigabit Ethernet controller [10ec:8136]
(rev 07)
Subsystem: ASUSTeK Computer Inc. RTL810xE PCI Express Fast
Ethernet controller [1043:200f]
Flags: bus master, fast devsel, latency 0, IRQ 127
I/O ports at e000 [size=256]
Memory at ef100000 (64-bit, non-prefetchable) [size=4K]
Memory at e0000000 (64-bit, prefetchable) [size=16K]
Capabilities: [40] Power Management version 3
Capabilities: [50] MSI: Enable+ Count=1/1 Maskable- 64bit+
Capabilities: [70] Express Endpoint, MSI 01
Capabilities: [b0] MSI-X: Enable- Count=4 Masked-
Capabilities: [d0] Vital Product Data
Capabilities: [100] Advanced Error Reporting
Capabilities: [140] Virtual Channel
Capabilities: [160] Device Serial Number 01-00-00-00-36-4c-e0-00
Capabilities: [170] Latency Tolerance Reporting
Kernel driver in use: r8169
Kernel modules: r8169

Signed-off-by: Jian-Hong Pan <jian-hong@endlessm.com>
---
drivers/net/ethernet/realtek/r8169.c | 9 ++++++---
1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/drivers/net/ethernet/realtek/r8169.c b/drivers/net/ethernet/realtek/r8169.c
index 0d9c3831838f..0efa977c422d 100644
--- a/drivers/net/ethernet/realtek/r8169.c
+++ b/drivers/net/ethernet/realtek/r8169.c
@@ -7071,17 +7071,20 @@ static int rtl_alloc_irq(struct rtl8169_private *tp)
{
unsigned int flags;

- if (tp->mac_version <= RTL_GIGA_MAC_VER_06) {
+ switch (tp->mac_version) {
+ case RTL_GIGA_MAC_VER_01 ... RTL_GIGA_MAC_VER_06:
RTL_W8(tp, Cfg9346, Cfg9346_Unlock);
RTL_W8(tp, Config2, RTL_R8(tp, Config2) & ~MSIEnable);
RTL_W8(tp, Cfg9346, Cfg9346_Lock);
flags = PCI_IRQ_LEGACY;
- } else if (tp->mac_version == RTL_GIGA_MAC_VER_40) {
+ break;
+ case RTL_GIGA_MAC_VER_39 ... RTL_GIGA_MAC_VER_40:
/* This version was reported to have issues with resume
* from suspend when using MSI-X
*/
flags = PCI_IRQ_LEGACY | PCI_IRQ_MSI;
- } else {
+ break;
+ default:
flags = PCI_IRQ_ALL_TYPES;
}

--
2.11.0
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