netdev - Re: [PATCH net-next v3 03/15] ice: add basic devlink subfunctions support

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Message-ID: <ZrYB2kEieNCIuof1@mev-dev.igk.intel.com>
Date: Fri, 9 Aug 2024 13:47:38 +0200
From: Michal Swiatkowski <michal.swiatkowski@...ux.intel.com>
To: Jiri Pirko <jiri@...nulli.us>
Cc: Tony Nguyen <anthony.l.nguyen@...el.com>, davem@...emloft.net,
	kuba@...nel.org, pabeni@...hat.com, edumazet@...gle.com,
	netdev@...r.kernel.org, Piotr Raczynski <piotr.raczynski@...el.com>,
	jiri@...dia.com, shayd@...dia.com, wojciech.drewek@...el.com,
	horms@...nel.org, sridhar.samudrala@...el.com,
	mateusz.polchlopek@...el.com, kalesh-anakkur.purayil@...adcom.com,
	michal.kubiak@...el.com, pio.raczynski@...il.com,
	przemyslaw.kitszel@...el.com, jacob.e.keller@...el.com,
	maciej.fijalkowski@...el.com,
	Rafal Romanowski <rafal.romanowski@...el.com>
Subject: Re: [PATCH net-next v3 03/15] ice: add basic devlink subfunctions
 support

On Fri, Aug 09, 2024 at 01:16:28PM +0200, Jiri Pirko wrote:
> Thu, Aug 08, 2024 at 07:30:49PM CEST, anthony.l.nguyen@...el.com wrote:
> >From: Piotr Raczynski <piotr.raczynski@...el.com>
> >
> 
> [...]
> 
> >+static int
> >+ice_devlink_port_new_check_attr(struct ice_pf *pf,
> >+				const struct devlink_port_new_attrs *new_attr,
> >+				struct netlink_ext_ack *extack)
> >+{
> >+	if (new_attr->flavour != DEVLINK_PORT_FLAVOUR_PCI_SF) {
> >+		NL_SET_ERR_MSG_MOD(extack, "Flavour other than pcisf is not supported");
> >+		return -EOPNOTSUPP;
> >+	}
> >+
> >+	if (new_attr->controller_valid) {
> >+		NL_SET_ERR_MSG_MOD(extack, "Setting controller is not supported");
> >+		return -EOPNOTSUPP;
> >+	}
> >+
> >+	if (new_attr->port_index_valid) {
> >+		NL_SET_ERR_MSG_MOD(extack, "Port index is invalid");
> 
> Nope, it is actually valid, but your driver does not support that.
> Please fix the message.
>

Ok

> 
> >+		return -EOPNOTSUPP;
> >+	}
> >+
> >+	if (new_attr->pfnum != pf->hw.bus.func) {
> 
> hw.bus.func, hmm. How about if you pass-through the PF to VM, can't the
> func be anything? Will this still make sense? I don't think so. If you
> get the PF number like this in the rest of the driver, you need to fix
> this.
>

I can change it to our internal value. I wonder if it will be better. If
I understand correctly, now:
PF0 - xx.xx.0; PF1 - xx.xx.1

I am doing pass-through PF1
PF0 (on host) - xx.xx.0

PF1 (on VM) - xx.xx.0 (there is one PF on VM, so for me it is more
intuitive to have func 0)

after I change:
PF0 - xx.xx.0; PF1 - xx.xx.1

pass-through PF1
PF0 (on host) - xx.xx.0

PF1 (on VM) - xx.xx.0, but user will have to use 1 as pf num

Correct me if I am wrong.

> 
> 
> >+		NL_SET_ERR_MSG_MOD(extack, "Incorrect pfnum supplied");
> >+		return -EINVAL;
> >+	}
> >+
> >+	if (!pci_msix_can_alloc_dyn(pf->pdev)) {
> >+		NL_SET_ERR_MSG_MOD(extack, "Dynamic MSIX-X interrupt allocation is not supported");
> >+		return -EOPNOTSUPP;
> >+	}
> >+
> >+	return 0;
> >+}
> 
> [...]
> 
> 
> >+int ice_devlink_create_sf_port(struct ice_dynamic_port *dyn_port)
> >+{
> >+	struct devlink_port_attrs attrs = {};
> >+	struct devlink_port *devlink_port;
> >+	struct devlink *devlink;
> >+	struct ice_vsi *vsi;
> >+	struct ice_pf *pf;
> >+
> >+	vsi = dyn_port->vsi;
> >+	pf = dyn_port->pf;
> >+
> >+	devlink_port = &dyn_port->devlink_port;
> >+
> >+	attrs.flavour = DEVLINK_PORT_FLAVOUR_PCI_SF;
> >+	attrs.pci_sf.pf = pf->hw.bus.func;
> 
> Same here.
> 
> 
> >+	attrs.pci_sf.sf = dyn_port->sfnum;
> >+
> >+	devlink_port_attrs_set(devlink_port, &attrs);
> >+	devlink = priv_to_devlink(pf);
> >+
> >+	return devl_port_register_with_ops(devlink, devlink_port, vsi->idx,
> >+					   &ice_devlink_port_sf_ops);
> >+}
> >+
> 
> [...]