iflib-if_em tests with HEAD and lagg panic [Was: Re: svn commit: r333338 - in stable/11/sys: dev/bnxt kern net sys]

[Harry Schmalzbauer]

Bezüglich Kevin Bowling's Nachricht vom 08.05.2018 11:52 (localtime):
…
>> But if the simple iflib/hw-support test with kawela+hartwell helps I'm
>> happy to do.
> 
> At this point it would be helpful, we think e1000 is nearing pretty
> good shape and I need to become familiar with any outstanding bugs.

I started with hartwell:
em1: attach_pre capping queues at 2

Current cap: 0x460b
em1: using 1024 tx descriptors and 1024 rx descriptors
em1: msix_init qsets capped at 2
em1: pxm cpus: 2 queue msgs: 4 admincnt: 1
em1: using 2 rx queues 2 tx queues
em1: Using MSIX interrupts with 3 vectors
em1: allocated for 2 tx_queues
em1: allocated for 2 rx_queues
em1: Ethernet address: 00:1b:21:3e:90:52
em1: netmap queues/slots: TX 2/1024, RX 2/1024
dev.em.1.iflib.driver_version: 7.6.1-k
dev.em.1.queue_rx_1.rx_irq: 0
dev.em.1.queue_rx_1.rxd_tail: 607
dev.em.1.queue_rx_1.rxd_head: 21
dev.em.1.queue_rx_0.rx_irq: 0
dev.em.1.queue_rx_0.rxd_tail: 410
dev.em.1.queue_rx_0.rxd_head: 412
dev.em.1.queue_tx_1.tx_irq: 0
dev.em.1.queue_tx_1.txd_tail: 8
dev.em.1.queue_tx_1.txd_head: 8
dev.em.1.queue_tx_0.tx_irq: 0
dev.em.1.queue_tx_0.txd_tail: 428
dev.em.1.queue_tx_0.txd_head: 428

Looks good so far, no problems with simple line speed (NFS4) copies.

According to the i217 (Clarkville) Datasheet, it also supports 2 queues:
Table 63. Intel® Ethernet Controller I217 Capability PHY Address 01,
          Page 776,Register 19
But it probably was never supported, at least I haven't ever checked
pre-iflib.
Here's the clakville:
em0: attach_pre capping queues at 1
em0: using 1024 tx descriptors and 1024 rx descriptors
em0: msix_init qsets capped at
em0: PCIY_MSIX capability not found; or rid 0 == 0.
em0: Using an MSI interrupt
em0: allocated for 1 tx_queues
em0: allocated for 1 rx_queues
em0: Ethernet address: 54:be:f7:0b:d7:4e
em0: netmap queues/slots: TX 1/1024, RX 1/1024

Since it's not not effort here, I also tried LACP, which panicked.
vmcore available, but what debugger to use these days? kgdb seems to be
replaced...

-harry