Re: [dpdk-dev] [PATCH v4 4/5] eal: add per rx queue interrupt handling based on VFIO

["Zhou, Danny" <danny.zhou@intel.com>]

> -----Original Message-----
> From: Thomas Monjalon [mailto:thomas.monjalon@6wind.com]
> Sent: Monday, February 23, 2015 11:19 PM
> To: Zhou, Danny
> Cc: Gonzalez Monroy, Sergio; dev@dpdk.org
> Subject: Re: [dpdk-dev] [PATCH v4 4/5] eal: add per rx queue interrupt handling based on VFIO
> 
> 2015-02-23 15:02, Zhou, Danny:
> > From: Thomas Monjalon [mailto:thomas.monjalon@6wind.com]
> > > 2015-02-23 11:47, Zhou, Danny:
> > > > From: Thomas Monjalon [mailto:thomas.monjalon@6wind.com]
> > > > > 2015-02-19 21:48, Zhou Danny:
> > > > > > --- a/lib/librte_eal/linuxapp/eal/Makefile
> > > > > > +++ b/lib/librte_eal/linuxapp/eal/Makefile
> > > > > > @@ -43,6 +43,7 @@ CFLAGS += -I$(SRCDIR)/include
> > > > > >  CFLAGS += -I$(RTE_SDK)/lib/librte_eal/common
> > > > > >  CFLAGS += -I$(RTE_SDK)/lib/librte_eal/common/include
> > > > > >  CFLAGS += -I$(RTE_SDK)/lib/librte_ring
> > > > > > +CFLAGS += -I$(RTE_SDK)/lib/librte_mbuf
> > > > > >  CFLAGS += -I$(RTE_SDK)/lib/librte_mempool
> > > > > >  CFLAGS += -I$(RTE_SDK)/lib/librte_malloc
> > > > > >  CFLAGS += -I$(RTE_SDK)/lib/librte_ether
> > > > >
> > > > > Why do we need mbuf in EAL?
> > > >
> > > > The file eal_interrupts.c includes rte_ethdev.h which defines structure rte_eth_devices that
> > > > eal needs to use in order to get per-port intr_handle. The rte_ethdev.h includes the rte_mbuf.h
> > > > so the Makefile is updated here.
> > >
> > > I see. You are breaking layer isolation by introducing ethdev in EAL.
> > > The cause seems to be:
> > >
> > > +       struct rte_intr_handle intr_handle =
> > > +                               rte_eth_devices[port_id].pci_dev->intr_handle;
> > >
> > > Maybe that pci_dev should be a parameter of the function.
> >
> > Adding pci_dev as a parameter has similar problem due to eal does not include rte_pci.h which
> 
> I don't understand your assertion. rte_pci.h is part of EAL.
> 

rte_eal.h does not include any DPDK header file, adding pci_dev would force it to include rte_pci.h file.
With solution below, those kinds of mess could be completely avoided.

> > defines struct rte_pci_device. It looks the new-added function rte_eal_wait_rx_intr(uint8_t port_id, uint8_t queue_id);
> > is not proper to be declared in rte_eal.h, will rename it to
> > 	rte_intr_wait_rx (struct rte_intr_handle *intr_handle, uint8_t queue_id);
> >
> > and then move declaration from rte_eal.h to rte_interrupts.h. So isolation can be avoided and no need to includes
> rte_ethdev.h
> > and change Makefile.
> 
> Yes could be better.