[dpdk-dev] i40e_aq_get_phy_capabilities() fails when using SFP+ with no link
Olivier MATZ
olivier.matz at 6wind.com
Tue Jan 10 16:28:49 CET 2017
Hi Christos,
+CC i40e maintainers
On Tue, 10 Jan 2017 20:32:26 +0800, Christos Ricudis
<ricudis.christos at gmail.com> wrote:
> Hello,
>
> Using a X710 based 4-port 4x10Gbit NIC, I have came across the
> following issue on the i40e PMD:
>
> When an optical SFP+ (Finisar FTLX8571D3BCL) is used with no active
> link partner on the other end of the link (or fiber completely
> disconnected from the SFP+), i40e_aq_get_phy_capabilities() (called
> by i40e_dev_sync_phy_type() on port initialization), fails with a
> 0x05 return value (EIO) on the AQ response structure. The struct
> i40e_aq_get_phy_abilities_resp buffer passed to the Get Phy Abilities
> command is unmodified upon return.
>
> This prevents DPDK 16.11 from initializing the port, and ultimately
> fails with the following error:
>
> PMD: eth_i40e_dev_init(): Failed to sync phy type: -95
>
> The change introducing this issue was
> http://dpdk.org/ml/archives/dev/2016-September/047663.html
>
> Reading the X710 datasheet, I notice that no specific mention is
> given on the meaning of EIO as a response to Get PHY Abilities
> command (opcode 0x0600), whereas in most other commands, an explicit
> mention of the meaning of the possible error status responses is
> given.
>
> This behaviour is the same across the following NVM releases:
>
> FW 4.33 API 1.2 NVM 04.04.02 eetrack 800018a6
> FW 4.40 API 1.4 NVM 04.05.03 eetrack 80001cd8
> FW 5.0 API 1.5 NVM 05.00.04 eetrack 800024da
>
> I will try to get around the issue by falling back to PHY
> capabilities detection using the device ID in the case
> i40e_aq_get_phy_capabilities() fails, but conceptually the
> capabilities of the PHY should not be dependent on whether PHY
> detects an active link or not.
>
> I’d be happy to do more testing on this issue per your
> recommendations.
>
> Moreover, while trying to debug this issue, I managed to get both 3
> NIC adapters on my test system on a state where the PHY has
> apparently died - no link indication at all on any ports. A reboot
> solved this, and I am now trying to replicate this behaviour under
> more controlled conditions.
>
I'm currently running into a similar issue (I think). I can reproduce
it with testpmd with the following case:
set link_check off
port stop 0
# don't wait between these 2 commands
port start 0
I added some logs that are displayed after the port start:
PMD: i40e_set_tx_function(): Vector tx finally be used.
PMD: i40e_set_rx_function(): Vector rx enabled, please make sure RX
burst size no less than 4 (port=0).
PMD: i40e_dev_rx_queue_start(): >>
PMD: i40e_dev_tx_queue_start(): >>
PMD: i40e_dev_start(): applying link settings...
PMD: i40e_apply_link_speed(): abilities = 38, speed = 0
PMD: i40e_phy_conf_link(): i40e_aq_get_phy_capabilities failed -7
PMD: i40e_dev_start(): Fail to apply link setting
PMD: i40e_dev_clear_queues(): >>
The -7 corresponds to I40E_ERR_UNKNOWN_PHY. This happens in
i40e_aq_get_phy_capabilities() in the following code, which makes me
think it's the same problem than yours:
if (hw->aq.asq_last_status == I40E_AQ_RC_EIO)
status = I40E_ERR_UNKNOWN_PHY;
A workaround in my usecase is to wait a bit between the stop and the
start.
Any help is welcome.
Regards,
Olivier
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