Date: Fri, 18 Sep 2020 19:52:53 +1000 From: Jason Tubnor <jason@tubnor.net> To: vmaffione@freebsd.org, mmacy@freebsd.org, freebsd-net@freebsd.org, erj@freebsd.org Subject: Fwd: Fragmentation of em(4) traffic (potentially others) when using vlanhwtag 12.2-BETA1 Message-ID: <CACLnyCLwb0ERcai47e6rA5gpy6YaTNBeF35bm1ENVWycYniT5g@mail.gmail.com> In-Reply-To: <CACLnyCJBa_g136m3_19FdVfb1xr3KHA_XmH_TeFo41HrUSofiw@mail.gmail.com> References: <CACLnyCJBa_g136m3_19FdVfb1xr3KHA_XmH_TeFo41HrUSofiw@mail.gmail.com>
next in thread | previous in thread | raw e-mail | index | archive | help
Cross-posting this issue that exists in the 12.2 cut. Cheers.
---------- Forwarded message ---------
From: Jason Tubnor <jason@tubnor.net>
Date: Thu, 17 Sep 2020 at 10:49
Subject: Fragmentation of em(4) traffic (potentially others) when using
vlanhwtag 12.2-BETA1
To: freebsd-stable <freebsd-stable@freebsd.org>
Hi,
Doing some edge case testing with 12.2-BETA1, I have come across
fragmentation issues when vlanhwtag is enabled on the em(4) network device
(device listed below), causing IPSec traffic moving through a bhyve
'router-on-a-stick' to tank on send. When you disable (-vlanhwtag), this
issue goes away and full speed send is possible.
Here is a snip of the traffic leaving for the internet after traversing
several VLANs through a bhyve router with vlanhwtag enabled:
10:09:54.173412 Dest.443 > Source.60901: . ack 12384 win 492 <nop,nop,sack
2 {10944:12235} {15373:18253} > (DF)
10:09:54.173936 Source.60901 > Dest.443: . 38413:39873(1460) ack 3837 win
1027 (frag 20228:1480@0+)
10:09:54.173937 Source > Dest: (frag 20228:1420@1480)
pciconf -vlbc
em0@pci0:0:25:0: class=0x020000 card=0x308617aa chip=0x15028086
rev=0x04 hdr=0x00
vendor = 'Intel Corporation'
device = '82579LM Gigabit Network Connection (Lewisville)'
class = network
subclass = ethernet
bar [10] = type Memory, range 32, base 0xf7d00000, size 131072,
enabled
bar [14] = type Memory, range 32, base 0xf7d39000, size 4096, enabled
bar [18] = type I/O Port, range 32, base 0xf080, size 32, enabled
cap 01[c8] = powerspec 2 supports D0 D3 current D0
cap 05[d0] = MSI supports 1 message, 64 bit enabled with 1 message
cap 13[e0] = PCI Advanced Features: FLR TP
Happy to provide further information if required and perform testing to
make sure the 12.2 release is polished. Thanks,
Jason.
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?CACLnyCLwb0ERcai47e6rA5gpy6YaTNBeF35bm1ENVWycYniT5g>