[Intel-wired-lan] [PATCH 2/4] [next-queue]net: i40e: Add infrastructure for queue channel support with the TCs and queue configurations offloaded via mqprio scheduler

[Patil, Kiran <kiran.patil@intel.com>]

On 5/24/2017 2:45 PM, Alexander Duyck wrote:
> On Fri, May 19, 2017 at 5:58 PM, Amritha Nambiar
> <amritha.nambiar@intel.com> wrote:
>> This patch sets up the infrastructure for offloading TCs and
>> queue configurations to the hardware by creating HW channels(VSI).
>> A new channel is created for each of the traffic class
>> configuration offloaded via mqprio framework except for the first TC
>> (TC0). TC0 for the main VSI is also reconfigured as per user provided
>> queue parameters. Queue counts that are not power-of-2 are handled by
>> reconfiguring RSS by reprogramming LUTs using the queue count value.
>> This patch also handles configuring the TX rings for the channels,
>> setting up the RX queue map for channel.
>>
>> Also, the channels so created are removed and all the queue
>> configuration is set to default when the qdisc is detached from the
>> root of the device.
>>
>> Signed-off-by: Amritha Nambiar <amritha.nambiar@intel.com>
>> Signed-off-by: Kiran Patil <kiran.patil@intel.com>
>> ---
>>   drivers/net/ethernet/intel/i40e/i40e.h      |   36 +
>>   drivers/net/ethernet/intel/i40e/i40e_main.c |  740 +++++++++++++++++++++++++++
>>   drivers/net/ethernet/intel/i40e/i40e_txrx.h |    2
>>   3 files changed, 771 insertions(+), 7 deletions(-)
>>
>> diff --git a/drivers/net/ethernet/intel/i40e/i40e.h b/drivers/net/ethernet/intel/i40e/i40e.h
>> index 395ca94..0915b02 100644
>
> [...]
>
>> diff --git a/drivers/net/ethernet/intel/i40e/i40e_main.c b/drivers/net/ethernet/intel/i40e/i40e_main.c
>> index 8d1d3b85..e1bea45 100644
>> --- a/drivers/net/ethernet/intel/i40e/i40e_main.c
>> +++ b/drivers/net/ethernet/intel/i40e/i40e_main.c
>
> [...]
>
>> +/**
>> + * i40e_create_queue_channel - function to create channel
>> + * @vsi: VSI to be configured
>> + * @ch: ptr to channel (it contains channel specific params)
>> + *
>> + * This function creates channel (VSI) using num_queues specified by user,
>> + * reconfigs RSS if needed.
>> + **/
>> +int i40e_create_queue_channel(struct i40e_vsi *vsi,
>> +                             struct i40e_channel *ch)
>> +{
>> +       struct i40e_pf *pf = vsi->back;
>> +       bool reconfig_rss;
>> +       int err;
>> +
>> +       if (!ch)
>> +               return -EINVAL;
>> +
>> +       if (!ch->num_queue_pairs) {
>> +               dev_err(&pf->pdev->dev, "Invalid num_queues requested: %d\n",
>> +                       ch->num_queue_pairs);
>> +               return -EINVAL;
>> +       }
>> +
>> +       /* validate user requested num_queues for channel */
>> +       err = i40e_validate_num_queues(pf, ch->num_queue_pairs, vsi,
>> +                                      &reconfig_rss);
>> +       if (err) {
>> +               dev_info(&pf->pdev->dev, "Failed to validate num_queues (%d)\n",
>> +                        ch->num_queue_pairs);
>> +               return -EINVAL;
>> +       }
>> +
>> +       /* By default we are in VEPA mode, if this is the first VF/VMDq
>> +        * VSI to be added switch to VEB mode.
>> +        */
>> +       if ((!(pf->flags & I40E_FLAG_VEB_MODE_ENABLED)) ||
>> +           (!i40e_is_any_channel(vsi))) {
>> +               if (!is_power_of_2(vsi->tc_config.tc_info[0].qcount)) {
>> +                       dev_info(&pf->pdev->dev,
>> +                                "Failed to create channel. Override queues (%u) not power of 2\n",
>> +                                vsi->tc_config.tc_info[0].qcount);
>> +                       return -EINVAL;
>> +               }
>> +
>> +               if (vsi->type == I40E_VSI_SRIOV) {
>> +                       if (!(pf->flags & I40E_FLAG_VEB_MODE_ENABLED)) {
>> +                               dev_info(&pf->pdev->dev,
>> +                                        "Expected to be VEB mode by this time\n");
>> +                               return -EINVAL;
>> +                       }
>> +               }
>> +               if (!(pf->flags & I40E_FLAG_VEB_MODE_ENABLED)) {
>> +                       pf->flags |= I40E_FLAG_VEB_MODE_ENABLED;
>> +
>> +                       if (vsi->type == I40E_VSI_MAIN) {
>> +                               if (pf->flags & I40E_FLAG_TC_MQPRIO)
>> +                                       i40e_do_reset(pf,
>> +                                       BIT_ULL(__I40E_PF_RESET_REQUESTED),
>> +                                                     true);
>> +                               else
>> +                                       i40e_do_reset_safe(pf,
>> +                                       BIT_ULL(__I40E_PF_RESET_REQUESTED));
>
> So these BIT_ULL lines are triggering a check in checkpatch, and I
> have to say I don't really like this as it really is messed up in
> terms of formatting.
>
> If nothing else you might want to look at defining a macro that
> replaces the line. That way you could still represent the same data
> without having to resort to misaligning things to make it under 80
> characters.
Agree, we will get it fixed thru' macro
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