Hi > -----Original Message----- > From: Zhang, Qi Z > Sent: Sunday, September 30, 2018 10:25 > To: Li, Xiaoyun <xiaoyun...@intel.com>; Xing, Beilei <beilei.x...@intel.com>; > dev@dpdk.org; Lu, Wenzhuo <wenzhuo...@intel.com>; Wu, Jingjing > <jingjing...@intel.com> > Subject: RE: [PATCH] doc: add known issue about legacy intr mode for ixgbe > > > > > -----Original Message----- > > From: Li, Xiaoyun > > Sent: Thursday, September 27, 2018 5:17 PM > > To: Xing, Beilei <beilei.x...@intel.com>; Zhang, Qi Z > > <qi.z.zh...@intel.com>; dev@dpdk.org; Lu, Wenzhuo > > <wenzhuo...@intel.com>; Wu, Jingjing <jingjing...@intel.com> > > Cc: Li, Xiaoyun <xiaoyun...@intel.com> > > Subject: [PATCH] doc: add known issue about legacy intr mode for ixgbe > > > > When using uio_pci_generic module or using legacy interrupt mode of > > igb_uio or vfio, X550 cannot get interrupts. Because the Interrupt > > Status bit is not implemented, then the irq cannot be handled > > correctly and cannot report the event fd to DPDK apps. > > > > Add this hw limitation and details into ixgbe known issue. > > > > Signed-off-by: Xiaoyun Li <xiaoyun...@intel.com> > > --- > > doc/guides/nics/ixgbe.rst | 26 ++++++++++++++++++++++++++ > > 1 file changed, 26 insertions(+) > > > > diff --git a/doc/guides/nics/ixgbe.rst b/doc/guides/nics/ixgbe.rst > > index 16d6390..4f89a6d 100644 > > --- a/doc/guides/nics/ixgbe.rst > > +++ b/doc/guides/nics/ixgbe.rst > > @@ -200,6 +200,32 @@ There is no RTE API to add a VF's MAC address > > from the PF. On ixgbe, the ``rte_eth_dev_mac_addr_add()`` function > > can be used to add a VF's MAC address, as a workaround. > > > > +legacy interrupt mode and uio pci generic module cannot be used in > > +X550 > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ > ~ > > ~~~~~~~ > > the reason we can't use uio_pci_generic, is it also because uio_pci_generic > require legacy mode? > If it is, can we simplified the title as " x550 does not support legacy > interrupt > mode"
Sure. > > > + > > +Desccription > > +^^^^^^^^^^^^ > > +X550 cannot get interrupts if using ``uio_pci_generic`` module or > > +using legacy interrupt mode of ``igb_uio`` or ``vfio``. Because the > > +errata of > > +X550 states that the Interrupt Status bit is not implemented. The > > +errata is the item #22 from `X550 spec update > > > +<https://www.intel.com/content/dam/www/public/us/en/documents/dat > as > > heet > > +s/ethernet-x550-spec-update.pdf>`_ > > Seems the url here is not correct, there is no errata item #22 Yes. Will correct it. Thanks. > > Regards > Qi > > > + > > +Implication > > +^^^^^^^^^^^ > > +When using ``uio_pci_generic`` module or using legacy interrupt mode > > +of ``igb_uio`` or ``vfio``, the Interrupt Status bit would be checked > > +if the interrupt is comming. Since the bit is not implemented in > > +X550, the irq cannot be handled correctly and cannot report the event > > +fd to DPDK apps. Then apps cannot get interrupts and ``dmesg`` will > > +show messages like ``irq #No.: `` ``nobody cared.`` > > + > > +Workaround > > +^^^^^^^^^^ > > +Do not bind the ``uio_pci_generic`` module in X550 NICs. > > +Do not bind ``igb_uio`` with legacy mode in X550 NICs. > > +Before using ``vfio`` with legacy mode in X550 NICs, using ``modprobe > > +vfio `` ``nointxmask=1`` to bind ``vfio``. > > > > Inline crypto processing support > > -------------------------------- > > -- > > 2.7.4
