Hi John,
> -----Original Message----- > From: Mcnamara, John > Sent: Wednesday, May 10, 2017 12:39 AM > To: Lu, Wenzhuo; dev@dpdk.org > Subject: RE: [PATCH] doc: update ixgbe doc > > > > > -----Original Message----- > > From: Lu, Wenzhuo > > Sent: Wednesday, May 3, 2017 6:55 AM > > To: dev@dpdk.org > > Cc: Mcnamara, John <john.mcnam...@intel.com>; Lu, Wenzhuo > > <wenzhuo...@intel.com> > > Subject: [PATCH] doc: update ixgbe doc > > > > Add more explanation about how to disable MDD on kernel PF. > > > > Signed-off-by: Wenzhuo Lu <wenzhuo...@intel.com> > > --- > > doc/guides/nics/ixgbe.rst | 9 ++++++--- > > 1 file changed, 6 insertions(+), 3 deletions(-) > > > > diff --git a/doc/guides/nics/ixgbe.rst b/doc/guides/nics/ixgbe.rst > > index > > 130765b..6773fe5 100644 > > --- a/doc/guides/nics/ixgbe.rst > > +++ b/doc/guides/nics/ixgbe.rst > > @@ -186,9 +186,12 @@ the advanced context descriptor should be set > and > > set it. And DPDK has to ask the info about the header length from the > > upper layer, because parsing the packet itself is not acceptable. So, > > it's too expensive to support MDD. > > When using kernel PF + DPDK VF on x550, please make sure using the > > kernel -driver that disables MDD or can disable MDD. (Some kernel > > driver can use -this CLI 'insmod ixgbe.ko MDD=0,0' to disable MDD. > > Some kernel driver disables -it by default.) > > +PF driver that disables MDD or can disable MDD. > > +Some kernel driver already disables MDD by default. > > +Some kernel driver can use this CLI "insmod ixgbe.ko MDD=0,0" to > > +disable > > MDD. > > +Every "0" in the CLI means a port. Users need to add more "0"s if the > > +machine has more ports. For example, if there're 6 ixgbe ports, the > > +CLI should be changed to "insmod ixgbe.ko MDD=0,0,0,0,0,0". > > Something like this would be better: > > ... > When using kernel PF + DPDK VF on x550, please make sure to use a kernel > PF driver that disables MDD or can disable MDD. > > Some kernel drivers already disable MDD by default while some kernels can > use the command ``insmod ixgbe.ko MDD=0,0`` to disable MDD. Each "0" in > the command refers to a port. For example, if there are 6 ixgbe ports, the > command should be changed to ``insmod ixgbe.ko MDD=0,0,0,0,0,0``. Thanks for your comments. I'll reword the patch.
