RE: [PATCH v5 04/22] ice: Register auxiliary device to provide RDMA

["Saleem, Shiraz" <shiraz.saleem@intel.com>]

> Subject: Re: [PATCH v5 04/22] ice: Register auxiliary device to provide RDMA
> 
> On Fri, May 14, 2021 at 09:11:56AM -0500, Shiraz Saleem wrote:
> > From: Dave Ertman <david.m.ertman@intel.com>
> >
> > Register ice client auxiliary RDMA device on the auxiliary bus per
> > PCIe device function for the auxiliary driver (irdma) to attach to.
> > It allows to realize a single RDMA driver (irdma) capable of working
> > with multiple netdev drivers over multi-generation Intel HW supporting RDMA.
> > There is no load ordering dependencies between ice and irdma.
> >
> > Signed-off-by: Dave Ertman <david.m.ertman@intel.com>
> > Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>
> > Signed-off-by: Shiraz Saleem <shiraz.saleem@intel.com>
> > ---
> >  drivers/net/ethernet/intel/Kconfig        |  1 +
> >  drivers/net/ethernet/intel/ice/ice.h      |  8 +++-
> >  drivers/net/ethernet/intel/ice/ice_idc.c  | 71
> > ++++++++++++++++++++++++++++++-
> > drivers/net/ethernet/intel/ice/ice_main.c | 11 ++++-
> >  4 files changed, 87 insertions(+), 4 deletions(-)
> >
> > diff --git a/drivers/net/ethernet/intel/Kconfig
> > b/drivers/net/ethernet/intel/Kconfig
> > index c1d1556..d8a12da 100644
> > --- a/drivers/net/ethernet/intel/Kconfig
> > +++ b/drivers/net/ethernet/intel/Kconfig
> > @@ -294,6 +294,7 @@ config ICE
> >  	tristate "Intel(R) Ethernet Connection E800 Series Support"
> >  	default n
> >  	depends on PCI_MSI
> > +	select AUXILIARY_BUS
> >  	select DIMLIB
> >  	select NET_DEVLINK
> >  	select PLDMFW
> > diff --git a/drivers/net/ethernet/intel/ice/ice.h
> > b/drivers/net/ethernet/intel/ice/ice.h
> > index 225f8a5..228055e 100644
> > --- a/drivers/net/ethernet/intel/ice/ice.h
> > +++ b/drivers/net/ethernet/intel/ice/ice.h
> > @@ -34,6 +34,7 @@
> >  #include <linux/if_bridge.h>
> >  #include <linux/ctype.h>
> >  #include <linux/bpf.h>
> > +#include <linux/auxiliary_bus.h>
> >  #include <linux/avf/virtchnl.h>
> >  #include <linux/cpu_rmap.h>
> >  #include <linux/dim.h>
> > @@ -647,6 +648,8 @@ static inline void ice_clear_sriov_cap(struct
> > ice_pf *pf)  void ice_fill_rss_lut(u8 *lut, u16 rss_table_size, u16
> > rss_size);  int ice_schedule_reset(struct ice_pf *pf, enum
> > ice_reset_req reset);  void ice_print_link_msg(struct ice_vsi *vsi,
> > bool isup);
> > +int ice_plug_aux_dev(struct ice_pf *pf); void
> > +ice_unplug_aux_dev(struct ice_pf *pf);
> >  int ice_init_rdma(struct ice_pf *pf);  const char *ice_stat_str(enum
> > ice_status stat_err);  const char *ice_aq_str(enum ice_aq_err aq_err);
> > @@ -678,8 +681,10 @@ int ice_aq_wait_for_event(struct ice_pf *pf, u16
> opcode, unsigned long timeout,
> >   */
> >  static inline void ice_set_rdma_cap(struct ice_pf *pf)  {
> > -	if (pf->hw.func_caps.common_cap.rdma && pf->num_rdma_msix)
> > +	if (pf->hw.func_caps.common_cap.rdma && pf->num_rdma_msix) {
> >  		set_bit(ICE_FLAG_RDMA_ENA, pf->flags);
> > +		ice_plug_aux_dev(pf);
> > +	}
> >  }
> >
> >  /**
> > @@ -688,6 +693,7 @@ static inline void ice_set_rdma_cap(struct ice_pf *pf)
> >   */
> >  static inline void ice_clear_rdma_cap(struct ice_pf *pf)  {
> > +	ice_unplug_aux_dev(pf);
> >  	clear_bit(ICE_FLAG_RDMA_ENA, pf->flags);  }  #endif /* _ICE_H_ */
> > diff --git a/drivers/net/ethernet/intel/ice/ice_idc.c
> > b/drivers/net/ethernet/intel/ice/ice_idc.c
> > index ffca0d5..e7bb8f6 100644
> > --- a/drivers/net/ethernet/intel/ice/ice_idc.c
> > +++ b/drivers/net/ethernet/intel/ice/ice_idc.c
> > @@ -255,6 +255,71 @@ static int ice_reserve_rdma_qvector(struct ice_pf
> > *pf)  }
> >
> >  /**
> > + * ice_adev_release - function to be mapped to AUX dev's release op
> > + * @dev: pointer to device to free
> > + */
> > +static void ice_adev_release(struct device *dev) {
> > +	struct iidc_auxiliary_dev *iadev;
> > +
> > +	iadev = container_of(dev, struct iidc_auxiliary_dev, adev.dev);
> > +	kfree(iadev);
> > +}
> > +
> > +/**
> > + * ice_plug_aux_dev - allocate and register AUX device
> > + * @pf: pointer to pf struct
> > + */
> > +int ice_plug_aux_dev(struct ice_pf *pf) {
> > +	struct iidc_auxiliary_dev *iadev;
> > +	struct auxiliary_device *adev;
> > +	int ret;
> > +
> > +	iadev = kzalloc(sizeof(*iadev), GFP_KERNEL);
> > +	if (!iadev)
> > +		return -ENOMEM;
> > +
> > +	adev = &iadev->adev;
> > +	pf->adev = adev;
> > +	iadev->pf = pf;
> > +
> > +	adev->id = pf->aux_idx;
> > +	adev->dev.release = ice_adev_release;
> > +	adev->dev.parent = &pf->pdev->dev;
> > +	adev->name = IIDC_RDMA_ROCE_NAME;
> 
> You declared IIDC_RDMA_ROCE_NAME as intel_rdma_roce, so it will create
> extremely awful device name, something like irdma.intel_rdma_roce.0

It is i40e.intel_rdma_iwarp.0 and ice.intel_rdma_roce.0.

> 
> I would say that "intel" and "rdma" can be probably dropped.
> 

I do not feel strongly about this and am ok with your request.

Shiraz