[Intel-wired-lan] [PATCH v2 iwl-next 07/10] idpf: add Tx timestamp capabilities negotiation

[Willem de Bruijn]

Milena Olech wrote:
> Tx timestamp capabilities are negotiated for the uplink Vport.
> Driver receives information about the number of available Tx timestamp
> latches, the size of Tx timestamp value and the set of indexes used
> for Tx timestamping.
> 
> Add function to get the Tx timestamp capabilities and parse the uplink
> vport flag.
> 
> Reviewed-by: Alexander Lobakin <aleksander.lobakin at intel.com>
> Co-developed-by: Emil Tantilov <emil.s.tantilov at intel.com>
> Signed-off-by: Emil Tantilov <emil.s.tantilov at intel.com>
> Co-developed-by: Pavan Kumar Linga <pavan.kumar.linga at intel.com>
> Signed-off-by: Pavan Kumar Linga <pavan.kumar.linga at intel.com>
> Signed-off-by: Milena Olech <milena.olech at intel.com>
> ---
> v1 -> v2: change the idpf_for_each_vport macro
> 
>  drivers/net/ethernet/intel/idpf/idpf.h        |   6 +
>  drivers/net/ethernet/intel/idpf/idpf_ptp.c    |  69 ++++++++++
>  drivers/net/ethernet/intel/idpf/idpf_ptp.h    |  96 ++++++++++++-
>  .../net/ethernet/intel/idpf/idpf_virtchnl.c   |  11 ++
>  .../ethernet/intel/idpf/idpf_virtchnl_ptp.c   | 128 +++++++++++++++++-
>  drivers/net/ethernet/intel/idpf/virtchnl2.h   |  10 +-
>  6 files changed, 317 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/net/ethernet/intel/idpf/idpf.h b/drivers/net/ethernet/intel/idpf/idpf.h
> index 1607e9641b23..14b82e93dab5 100644
> --- a/drivers/net/ethernet/intel/idpf/idpf.h
> +++ b/drivers/net/ethernet/intel/idpf/idpf.h
> @@ -292,6 +292,7 @@ struct idpf_port_stats {
>   * @port_stats: per port csum, header split, and other offload stats
>   * @link_up: True if link is up
>   * @sw_marker_wq: workqueue for marker packets
> + * @tx_tstamp_caps: The capabilities negotiated for Tx timestamping
>   */
>  struct idpf_vport {
>  	u16 num_txq;
> @@ -336,6 +337,8 @@ struct idpf_vport {
>  	bool link_up;
>  
>  	wait_queue_head_t sw_marker_wq;
> +
> +	struct idpf_ptp_vport_tx_tstamp_caps *tx_tstamp_caps;
>  };
>  
>  /**
> @@ -480,6 +483,9 @@ struct idpf_vport_config {
>  
>  struct idpf_vc_xn_manager;
>  
> +#define idpf_for_each_vport(adapter, i) \
> +	for ((i) = 0; (i) < (adapter)->num_alloc_vports; (i)++)
> +

I did not mean to make the code less readable. My suggestion was

    #define idpf_for_each_vport(adapter, vport) \
        for (int i = 0; vport = &(adapter)->vports[i], i < (adapter)->num_alloc_vports; i++)

I see that this now requires defining a variable i outside of the
loop. I suppose because of a possible namespace collision otherwise?

That can be addressed with the same stringification as the original
code. But then may as well revert to that. The following is no
more readable

    #define idpf_for_each_vport(adapter, vport) \
        for (int __idx_##vport = 0; \
             vport = &((adapter)->vports[__idx_##vport]), __idx_##vport < (adapter)->num_alloc_vports; \
             __idx_##vport++)

Please choose whichever path you prefer, including the original.

Not for this series, but a wrapper might also be helpful for
idpf_vport_for_each_rxq. To isolate the singleq vs splitq in one
location. I see that come up a come up times in this series too.