netdev - Re: [PATCH 07/22] RDMA/irdma: Register an auxiliary driver and implement private channel OPs

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Date:   Tue, 26 Jan 2021 07:37:40 +0200
From:   Leon Romanovsky <leon@...nel.org>
To:     Jason Gunthorpe <jgg@...dia.com>
Cc:     Shiraz Saleem <shiraz.saleem@...el.com>, dledford@...hat.com,
        kuba@...nel.org, davem@...emloft.net, linux-rdma@...r.kernel.org,
        gregkh@...uxfoundation.org, netdev@...r.kernel.org,
        david.m.ertman@...el.com, anthony.l.nguyen@...el.com,
        Mustafa Ismail <mustafa.ismail@...el.com>
Subject: Re: [PATCH 07/22] RDMA/irdma: Register an auxiliary driver and
 implement private channel OPs

On Mon, Jan 25, 2021 at 02:42:48PM -0400, Jason Gunthorpe wrote:
> On Fri, Jan 22, 2021 at 05:48:12PM -0600, Shiraz Saleem wrote:
> > +/**
> > + * irdma_init_dev - GEN_2 device init
> > + * @aux_dev: auxiliary device
> > + *
> > + * Create device resources, set up queues, pble and hmc objects.
> > + * Return 0 if successful, otherwise return error
> > + */
> > +int irdma_init_dev(struct auxiliary_device *aux_dev)
> > +{
> > +	struct iidc_auxiliary_object *vo = container_of(aux_dev,
> > +							struct iidc_auxiliary_object,
> > +							adev);
> > +	struct iidc_peer_obj *peer_info = vo->peer_obj;
> > +	struct irdma_handler *hdl;
> > +	struct irdma_pci_f *rf;
> > +	struct irdma_sc_dev *dev;
> > +	struct irdma_priv_peer_info *priv_peer_info;
> > +	int err;
> > +
> > +	hdl = irdma_find_handler(peer_info->pdev);
> > +	if (hdl)
> > +		return -EBUSY;
> > +
> > +	hdl = kzalloc(sizeof(*hdl), GFP_KERNEL);
> > +	if (!hdl)
> > +		return -ENOMEM;
> > +
> > +	rf = &hdl->rf;
> > +	priv_peer_info = &rf->priv_peer_info;
> > +	rf->aux_dev = aux_dev;
> > +	rf->hdl = hdl;
> > +	dev = &rf->sc_dev;
> > +	dev->back_dev = rf;
> > +	rf->gen_ops.init_hw = icrdma_init_hw;
> > +	rf->gen_ops.request_reset = icrdma_request_reset;
> > +	rf->gen_ops.register_qset = irdma_lan_register_qset;
> > +	rf->gen_ops.unregister_qset = irdma_lan_unregister_qset;
> > +	priv_peer_info->peer_info = peer_info;
> > +	rf->rdma_ver = IRDMA_GEN_2;
> > +	irdma_set_config_params(rf);
> > +	dev->pci_rev = peer_info->pdev->revision;
> > +	rf->default_vsi.vsi_idx = peer_info->pf_vsi_num;
> > +	/* save information from peer_info to priv_peer_info*/
> > +	priv_peer_info->fn_num = PCI_FUNC(peer_info->pdev->devfn);
> > +	rf->hw.hw_addr = peer_info->hw_addr;
> > +	rf->pcidev = peer_info->pdev;
> > +	rf->netdev = peer_info->netdev;
> > +	priv_peer_info->ftype = peer_info->ftype;
> > +	priv_peer_info->msix_count = peer_info->msix_count;
> > +	priv_peer_info->msix_entries = peer_info->msix_entries;
> > +	irdma_add_handler(hdl);
> > +	if (irdma_ctrl_init_hw(rf)) {
> > +		err = -EIO;
> > +		goto err_ctrl_init;
> > +	}
> > +	peer_info->peer_ops = &irdma_peer_ops;
> > +	peer_info->peer_drv = &irdma_peer_drv;
> > +	err = peer_info->ops->peer_register(peer_info);
> > +	if (err)
> > +		goto err_peer_reg;
>
> No to this, I don't want to see aux bus layered on top of another
> management framework in new drivers. When this driver uses aux bus get
> rid of the old i40iw stuff. I already said this in one of the older
> postings of this driver.
>
> auxbus probe() for a RDMA driver should call ib_alloc_device() near
> its start and ib_register_device() near the end its end.
>
> drvdata for the aux device should point to the driver struct
> containing the ib_device.

My other expectation is to see at least two aux_drivers, one for the
RoCE and another for the iWARP. It will allow easy management for the
users if they decide to disable/enable specific functionality
(/sys/bus/auxiliary/device/*). It will simplify code management too.

Thanks