netmap/ixl and crc addition..

[Alexandre Snarskii]

On Tue, Mar 24, 2020 at 03:37:36PM +0300, Alexandre Snarskii wrote:
> 
> 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.

... add missing attach :(

> 
> 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 at 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
> 
> 
> _______________________________________________
> freebsd-net at freebsd.org mailing list
> https://lists.freebsd.org/mailman/listinfo/freebsd-net
> To unsubscribe, send any mail to "freebsd-net-unsubscribe at freebsd.org"
-------------- next part --------------
A non-text attachment was scrubbed...
Name: if_ixl_netmap.h.diff
Type: text/x-diff
Size: 606 bytes
Desc: not available
URL: <http://lists.freebsd.org/pipermail/freebsd-net/attachments/20200324/c55b057e/attachment.diff>