* [dpdk-dev] [Bug 250] i40e: rte_eth_link_get_nowait() on X722 returns wrong link_speed value 20000 instead of 10000
@ 2019-04-10 9:21 bugzilla
2019-04-10 9:21 ` bugzilla
0 siblings, 1 reply; 2+ messages in thread
From: bugzilla @ 2019-04-10 9:21 UTC (permalink / raw)
To: dev
https://bugs.dpdk.org/show_bug.cgi?id=250
Bug ID: 250
Summary: i40e: rte_eth_link_get_nowait() on X722 returns wrong
link_speed value 20000 instead of 10000
Product: DPDK
Version: 18.11
Hardware: All
OS: Linux
Status: CONFIRMED
Severity: normal
Priority: Normal
Component: ethdev
Assignee: dev@dpdk.org
Reporter: martin.weiser@allegro-packets.com
Target Milestone: ---
When using a Xeon D with an integrated X722 NIC that provides two
ports of 8086:37d2 and two ports of 8086:37d0 all four ports show the
same behavior: they return a link speed value of 20000 for a 10Gbps link.
This only seems to happen when internally the update_link_reg() function
in i40e_ethdev.c is used. This requires the application to use the
rte_eth_link_get_nowait() function and not use link status change
interrupts.
To reproduce use e.g. testpmd with the option --no-lsc-interrupt:
it will suddenly show a link speed of 20000 Mbps instead of 10000 Mbps.
Here are two examples of the register values read by update_link_reg():
A 10Gbps link which produces the wrong link speed value:
I40E_PRTMAC_LINKSTA: 0x60000080
I40E_PRTMAC_MACC: 0x3d00
A 1Gbps link which produces the correct link speed value:
I40E_PRTMAC_LINKSTA: 0x48000081
I40E_PRTMAC_MACC: 0x3d00
--
You are receiving this mail because:
You are the assignee for the bug.
^ permalink raw reply [flat|nested] 2+ messages in thread
* [dpdk-dev] [Bug 250] i40e: rte_eth_link_get_nowait() on X722 returns wrong link_speed value 20000 instead of 10000
2019-04-10 9:21 [dpdk-dev] [Bug 250] i40e: rte_eth_link_get_nowait() on X722 returns wrong link_speed value 20000 instead of 10000 bugzilla
@ 2019-04-10 9:21 ` bugzilla
0 siblings, 0 replies; 2+ messages in thread
From: bugzilla @ 2019-04-10 9:21 UTC (permalink / raw)
To: dev
https://bugs.dpdk.org/show_bug.cgi?id=250
Bug ID: 250
Summary: i40e: rte_eth_link_get_nowait() on X722 returns wrong
link_speed value 20000 instead of 10000
Product: DPDK
Version: 18.11
Hardware: All
OS: Linux
Status: CONFIRMED
Severity: normal
Priority: Normal
Component: ethdev
Assignee: dev@dpdk.org
Reporter: martin.weiser@allegro-packets.com
Target Milestone: ---
When using a Xeon D with an integrated X722 NIC that provides two
ports of 8086:37d2 and two ports of 8086:37d0 all four ports show the
same behavior: they return a link speed value of 20000 for a 10Gbps link.
This only seems to happen when internally the update_link_reg() function
in i40e_ethdev.c is used. This requires the application to use the
rte_eth_link_get_nowait() function and not use link status change
interrupts.
To reproduce use e.g. testpmd with the option --no-lsc-interrupt:
it will suddenly show a link speed of 20000 Mbps instead of 10000 Mbps.
Here are two examples of the register values read by update_link_reg():
A 10Gbps link which produces the wrong link speed value:
I40E_PRTMAC_LINKSTA: 0x60000080
I40E_PRTMAC_MACC: 0x3d00
A 1Gbps link which produces the correct link speed value:
I40E_PRTMAC_LINKSTA: 0x48000081
I40E_PRTMAC_MACC: 0x3d00
--
You are receiving this mail because:
You are the assignee for the bug.
^ permalink raw reply [flat|nested] 2+ messages in thread
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2019-04-10 9:21 [dpdk-dev] [Bug 250] i40e: rte_eth_link_get_nowait() on X722 returns wrong link_speed value 20000 instead of 10000 bugzilla
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