netdev - Re: [RFC v3 02/11] IB/hfi-vnic: Virtual Network Interface Controller (VNIC) interface

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Message-ID: <20170208011246.GC76793@knc-06.sc.intel.com>
Date:   Tue, 7 Feb 2017 17:12:46 -0800
From:   "Vishwanathapura, Niranjana" <niranjana.vishwanathapura@...el.com>
To:     Parav Pandit <parav@...lanox.com>
Cc:     "dledford@...hat.com" <dledford@...hat.com>,
        "linux-rdma@...r.kernel.org" <linux-rdma@...r.kernel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "dennis.dalessandro@...el.com" <dennis.dalessandro@...el.com>,
        "ira.weiny@...el.com" <ira.weiny@...el.com>
Subject: Re: [RFC v3 02/11] IB/hfi-vnic: Virtual Network Interface Controller
 (VNIC) interface

On Wed, Feb 08, 2017 at 12:43:40AM +0000, Parav Pandit wrote:
>> @@ -2096,6 +2114,15 @@ struct ib_device {
>>  							   struct
>> ib_rwq_ind_table_init_attr *init_attr,
>>  							   struct ib_udata
>> *udata);
>>  	int                        (*destroy_rwq_ind_table)(struct ib_rwq_ind_table
>> *wq_ind_table);
>> +	/* rdma netdev operations */
>> +	struct net_device *(*alloc_rdma_netdev)(
>> +					struct ib_device *device,
>> +					u8 port_num,
>> +					enum rdma_netdev_t type,
>> +					const char *name,
>> +					unsigned char name_assign_type,
>> +					void (*setup)(struct net_device *));
>> +	void (*free_rdma_netdev)(struct net_device *netdev);
>>  	struct ib_dma_mapping_ops   *dma_ops;
>>
>>  	struct module               *owner;
>
>As its clear from the cover letter and from the request to place this in drivers/infiniband/ulp,
>Instead of increasing the ib_dev structure further,
>Can you change the code to make use of ib_register_client() and friend functions to register vnic as ULP.
>(similar to other ULP such as uverbs, srp, ipoib).
>This will also allow you get to get notified for removing the vnic device when underlying rdma device gets removed.
>Based on the property that gets exposed by the ibdev, vnic driver filters whether it needs to load its vnic to specific device or not.
>This way modules are isolated between core and ULP little better.
>Would it work for you?

HFI_VNIC driver is using ib_register_client() and friend fucntions. Below patch 
in this series does that.
[RFC v3 08/11] IB/hfi-vnic: VNIC Ethernet Management Agent (VEMA) function

Niranjana

>