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Date:      Tue, 24 Mar 2020 15:37:36 +0300
From:      Alexandre Snarskii <snar@snar.spb.ru>
To:        freebsd-net@freebsd.org
Subject:   netmap/ixl and crc addition..
Message-ID:  <20200324123721.GA26248@staff.retn.net>

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Hi!

Long story short: looks like intel x722 does not by default add CRC to 
outbound frames, so with FreeBSD 11-stable netmap-generated traffic is 
dropped on the next port.. Fix is simple, attached.

The same behaviour of 'unconditionally ask card to compute crc' can
be found in both if_ixl:
https://svnweb.freebsd.org/base/stable/11/sys/dev/ixl/ixl_txrx.c?view=markup#l408
and in DPDK i40e driver:
https://github.com/DPDK/dpdk/blob/master/drivers/net/i40e/i40e_rxtx.c#L1105
so, I guess, it's safe.

PS: of course, first idea was to upgrade to FreeBSD 12-stable, but while
this upgrade solved the crc problem, this version shows 'stalled tx queue' 
problem: after CTXSYNC tail == head == cur, 'no space in ring' condition. 
Attempts to ignore this condition led to continuous ring resets in txcsync:

Mar 17 20:21:08 host kernel: 668.224836 [1679] nm_txsync_prologue        ixl1 TX3: fail 'head < kring->rhead || head > kring->rtail' h 136 c 136 t 135 rh 135 rc 135 rt 135 hc 135 ht 135
Mar 17 20:21:08 host kernel: 668.238300 [1787] netmap_ring_reinit        called for ixl1 TX3

PPS: hardware details: Dell VEP4600, based on Xeon D-2100 with 
two onboard X722 ports (actually, four, but two of them are not
wired).

CPU: Intel(R) Xeon(R) D-2187NT CPU @ 2.00GHz (2000.06-MHz K8-class CPU)
  Origin="GenuineIntel"  Id=0x50654  Family=0x6  Model=0x55  Stepping=4

ixl0: <Intel(R) Ethernet Connection 700 Series PF Driver, Version - 1.11.9-k> mem 0xfa000000-0xfaffffff,0xfb018000-0xfb01ffff irq 11 at device 0.0 numa-domain 0 on pci12
ixl0: using 1024 tx descriptors and 1024 rx descriptors
ixl0: fw 3.1.57069 api 1.5 nvm 3.33 etid 80001007 oem 1.263.0
ixl0: PF-ID[0]: VFs 32, MSIX 129, VF MSIX 5, QPs 384, I2C
ixl0: Using MSIX interrupts with 9 vectors
ixl0: Allocating 8 queues for PF LAN VSI; 8 queues active
ixl0: Ethernet address: 3c:2c:30:30:59:85
ixl0: SR-IOV ready
ixl0: netmap queues/slots: TX 8/1024, RX 8/1024

ixl0@pci0:184:0:0:	class=0x020000 card=0x00008086 chip=0x37d38086 rev=0x04 hdr=0x00
    vendor     = 'Intel Corporation'
    device     = 'Ethernet Connection X722 for 10GbE SFP+'
    class      = network
    subclass   = ethernet





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