[Bug 193152] New: mlxen driver problem (iSCSI issue) with MT26448 interface

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=193152

            Bug ID: 193152
           Summary: mlxen driver problem (iSCSI issue) with MT26448
                    interface
           Product: Base System
           Version: 10.0-RELEASE
          Hardware: amd64
                OS: Any
            Status: Needs Triage
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: gnoma_86 at gbg.bg

Hello,

I had problem using the driver mlxen from the ports tree. I built it in the
kernel, tried also loading it dynamically, it's the same issue. 
When I start iSCSI daemon (tried ctld and istgt, same issue) I cannot connect
to the iSCSI from the initiator and I got the following message in the syslog:

Aug 29 11:15:19 sentinel kernel: WARNING: 10.0.80.2
(iqn.1991-05.com.unixhomenet:hola-pc): no ping reply (NOP-Out) after 5 seconds;
dropping connection
Aug 29 11:15:51 sentinel kernel: cfiscsi_ioctl_handoff: new connection from
iqn.1991-05.com.unixhomenet:hola-pc (10.0.80.2) to
iqn.sentinel.deltanews.lan:test123
Aug 29 11:15:58 sentinel kernel: WARNING: 10.0.80.2
(iqn.1991-05.com.unixhomenet:hola-pc): no ping reply (NOP-Out) after 5 seconds;
dropping connection
Aug 29 11:16:01 sentinel kernel: cfiscsi_ioctl_handoff: new connection from
iqn.1991-05.com.unixhomenet:hola-pc (10.0.80.2) to
iqn.sentinel.deltanews.lan:test123
Aug 29 11:16:21 sentinel kernel: WARNING: 10.0.80.2
(iqn.1991-05.com.unixhomenet:hola-pc): no ping reply (NOP-Out) after 5 seconds;
dropping connection
Aug 29 11:17:15 sentinel kernel: cfiscsi_ioctl_handoff: new connection from
iqn.1991-05.com.unixhomenet:hola-pc (10.0.80.2) to
iqn.sentinel.deltanews.lan:test123
Aug 29 11:17:20 sentinel kernel: WARNING: 10.0.80.2
(iqn.1991-05.com.unixhomenet:hola-pc): no ping reply (NOP-Out) after 5 seconds;
dropping connection


Also noticed some package lost:

root at sentinel:/var/log # ping -f 10.0.80.2
PING 10.0.80.2 (10.0.80.2): 56 data bytes
.............................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................^C
--- 10.0.80.2 ping statistics ---
168461 packets transmitted, 167952 packets received, 0.3% packet loss
round-trip min/avg/max/stddev = 0.020/0.031/0.360/0.011 ms
root at sentinel:/var/log #


switching iSCSI traffic, or testing the connection with flooding ping via
standard Intel 1GB interface makes no trouble:

root at sentinel:/var/log # ping -f 192.168.2.101
PING 192.168.2.101 (192.168.2.101): 56 data bytes
.^C
--- 192.168.2.101 ping statistics ---
44140 packets transmitted, 44139 packets received, 0.0% packet loss
round-trip min/avg/max/stddev = 0.105/0.303/0.466/0.062 ms
root at sentinel:/var/log #

Building the last version of the driver provided by mellanox website
(http://www.mellanox.com/downloads/Drivers/MLNX_EN_FreeBSD_v2.1.tgz) fixed the
iSCSI issue, but flooding ping still reports some package loss.
Also trying to load dynamically the driver from mellanox during boot using
loader.conf seem to fail, so I had to put the kldload command in rc.local, or
in /etc/rc.d/crld in order to assure it's being loaded at system boot and
interface is configured before iSCSI target daemon starts.

I can also provide tcpdumps if needed.

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