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fcoe: handle CNAs with DCB firmware support 

Some Combined Network Adapters(CNAs) implement DCB protocol
in firmware, it is recommended that do not run software-based
DCB or LLDP on CNAs that implement DCB, but we have to start
the lldpad service anyway(there might be other software DCB).

If the network interface provides hardware DCB/DCBX capabilities,
the field DCB_REQUIRED in "/etc/fcoe/cfg-xxx" is expected to
be set to "no".

We met an issue on "QLogic BCM57810" with DCB firmware support,
and found dracut still generated "fcoe=<mac>:dcb" which caused
kdump boot failure when using that fcoe dump target.

This patch parses /etc/fcoe/cfg-xxx to detect DCB_REQUIRED="no",
and force "nodcb" if it is the case.

Also improved some coding style in passing.

Signed-off-by: Xunlei Pang <xlpang@redhat.com>
master
Xunlei Pang 2017-09-25 11:18:06 +08:00
parent 424c065cd9
commit 795256bbb1
1 changed files with 20 additions and 6 deletions
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14
modules.d/95fcoe/module-setup.sh
View File

@ -61,6 +61,20 @@ cmdline() {
else else
dcb="nodcb" dcb="nodcb"
fi fi

# Some Combined Network Adapters(CNAs) implement DCB in firmware.
# Do not run software-based DCB or LLDP on CNAs that implement DCB.
# If the network interface provides hardware DCB/DCBX capabilities,
# DCB_REQUIRED in "/etc/fcoe/cfg-xxx" is expected to set to "no".
#
# Force "nodcb" if there's any DCB_REQUIRED="no"(child or vlan parent).
grep -q "^[[:blank:]]*DCB_REQUIRED=\"no\"" /etc/fcoe/cfg-${i##*/} &>/dev/null
[ $? -eq 0 ] && dcb="nodcb"
if [ "$p" ] ; then
grep -q "^[[:blank:]]*DCB_REQUIRED=\"no\"" /etc/fcoe/cfg-${p} &>/dev/null
[ $? -eq 0 ] && dcb="nodcb"
fi

echo "fcoe=${mac}:${dcb}" echo "fcoe=${mac}:${dcb}"
done done
} }