netdev - Re: [Intel-wired-lan] [PATCH net-next 01/15] virtchnl: add virtchnl version 2 ops

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Date:   Fri, 31 Mar 2023 17:25:33 +0200
From:   Simon Horman <simon.horman@...igine.com>
To:     Pavan Kumar Linga <pavan.kumar.linga@...el.com>
Cc:     intel-wired-lan@...ts.osuosl.org, netdev@...r.kernel.org,
        shiraz.saleem@...el.com, emil.s.tantilov@...el.com,
        willemb@...gle.com, decot@...gle.com, joshua.a.hay@...el.com,
        sridhar.samudrala@...el.com, Alan Brady <alan.brady@...el.com>,
        Madhu Chittim <madhu.chittim@...el.com>,
        Phani Burra <phani.r.burra@...el.com>
Subject: Re: [Intel-wired-lan] [PATCH net-next 01/15] virtchnl: add virtchnl
 version 2 ops

On Wed, Mar 29, 2023 at 07:03:50AM -0700, Pavan Kumar Linga wrote:
> Virtchnl version 1 is an interface used by the current generation of
> foundational NICs to negotiate the capabilities and configure the
> HW resources such as queues, vectors, RSS LUT, etc between the PF
> and VF drivers. It is not extensible to enable new features supported
> in the next generation of NICs/IPUs and to negotiate descriptor types,
> packet types and register offsets.
> 
> To overcome the limitations of the existing interface, introduce
> the virtchnl version 2 and add the necessary opcodes, structures,
> definitions, and descriptor formats. The driver also learns the
> data queue and other register offsets to use instead of hardcoding
> them. The advantage of this approach is that it gives the flexibility
> to modify the register offsets if needed, restrict the use of
> certain descriptor types and negotiate the supported packet types.
> 
> Following are the links to the specifications for reference
> 
> Virtchnl version1:
> https://www.intel.com/content/dam/www/public/us/en/documents/
> product-specifications/ethernet-adaptive-virtual-function-hardware-spec.pdf
> 
> Virtchnl version2:
> https://www.oasis-open.org/committees/documents.php?wg_abbrev=idpf
> 
> Co-developed-by: Alan Brady <alan.brady@...el.com>
> Signed-off-by: Alan Brady <alan.brady@...el.com>
> Co-developed-by: Joshua Hay <joshua.a.hay@...el.com>
> Signed-off-by: Joshua Hay <joshua.a.hay@...el.com>
> Co-developed-by: Madhu Chittim <madhu.chittim@...el.com>
> Signed-off-by: Madhu Chittim <madhu.chittim@...el.com>
> Co-developed-by: Phani Burra <phani.r.burra@...el.com>
> Signed-off-by: Phani Burra <phani.r.burra@...el.com>
> Co-developed-by: Sridhar Samudrala <sridhar.samudrala@...el.com>
> Signed-off-by: Sridhar Samudrala <sridhar.samudrala@...el.com>
> Signed-off-by: Pavan Kumar Linga <pavan.kumar.linga@...el.com>
> Reviewed-by: Sridhar Samudrala <sridhar.samudrala@...el.com>

I guess this patchset has a while to run in review.
Some initial nits from my side, in case they are of any use to you.

...

> +/* Transmit queue config info */
> +struct virtchnl2_txq_info {
> +	__le64 dma_ring_addr;
> +
> +	/* See VIRTCHNL2_QUEUE_TYPE definitions */
> +	__le32 type;
> +
> +	__le32 queue_id;
> +	/* Valid only if queue model is split and type is trasmit queue. Used

nit: s/trasmit/transmit/

...

> +/* Receive Descriptors */
> +/* Splitq buf
> + * |                                       16|                   0|
> + * ----------------------------------------------------------------
> + * | RSV                                     | Buffer ID          |
> + * ----------------------------------------------------------------
> + * | Rx packet buffer adresss                                     |

nit: s/adresss/address

> + * ----------------------------------------------------------------
> + * | Rx header buffer adresss                                     |

ditto

> + * ----------------------------------------------------------------
> + * | RSV                                                          |
> + * ----------------------------------------------------------------
> + * |                                                             0|
> + */
> +struct virtchnl2_splitq_rx_buf_desc {
> +	struct {
> +		/* Buffer Identifier */
> +		__le16  buf_id;
> +		__le16  rsvd0;
> +		__le32  rsvd1;
> +	} qword0;
> +
> +	/* Packet buffer address */

ditto

> +	__le64  pkt_addr;
> +	/* Header buffer address */

ditto

> +	__le64  hdr_addr;
> +	__le64  rsvd2;
> +}; /* RX buffer descriptor format */