netdev - Re: [for-next V2 10/10] RDMA/core: Provide RDMA DIM support for ULPs

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Message-ID: <690d58a0-df81-c02f-e46d-863ca8c3236e@mellanox.com>
Date:   Thu, 27 Jun 2019 05:28:29 +0000
From:   Yamin Friedman <yaminf@...lanox.com>
To:     Sagi Grimberg <sagi@...mberg.me>,
        Saeed Mahameed <saeedm@...lanox.com>,
        "David S. Miller" <davem@...emloft.net>,
        Doug Ledford <dledford@...hat.com>,
        Jason Gunthorpe <jgg@...lanox.com>
CC:     Leon Romanovsky <leonro@...lanox.com>,
        Or Gerlitz <ogerlitz@...lanox.com>,
        Tal Gilboa <talgi@...lanox.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-rdma@...r.kernel.org" <linux-rdma@...r.kernel.org>,
        Max Gurtovoy <maxg@...lanox.com>
Subject: Re: [for-next V2 10/10] RDMA/core: Provide RDMA DIM support for ULPs


On 6/26/2019 12:14 AM, Sagi Grimberg wrote:
>
>
>> +static int ib_poll_dim_handler(struct irq_poll *iop, int budget)
>> +{
>> +    struct ib_cq *cq = container_of(iop, struct ib_cq, iop);
>> +    struct dim *dim = cq->dim;
>> +    int completed;
>> +
>> +    completed = __ib_process_cq(cq, budget, cq->wc, IB_POLL_BATCH);
>> +    if (completed < budget) {
>> +        irq_poll_complete(&cq->iop);
>> +        if (ib_req_notify_cq(cq, IB_POLL_FLAGS) > 0)
>> +            irq_poll_sched(&cq->iop);
>> +    }
>> +
>> +    rdma_dim(dim, completed);
>
> Why duplicate the entire thing for a one-liner?
You are right, this was leftover from a previous version where there 
were more significant changes. I will remove the extra function.
>
>> +
>> +    return completed;
>> +}
>> +
>>   static void ib_cq_completion_softirq(struct ib_cq *cq, void *private)
>>   {
>>       irq_poll_sched(&cq->iop);
>> @@ -105,14 +157,18 @@ static void ib_cq_completion_softirq(struct 
>> ib_cq *cq, void *private)
>>     static void ib_cq_poll_work(struct work_struct *work)
>>   {
>> -    struct ib_cq *cq = container_of(work, struct ib_cq, work);
>> +    struct ib_cq *cq = container_of(work, struct ib_cq,
>> +                    work);
>
> Why was that changed?

I will fix this.

>
>>       int completed;
>>         completed = __ib_process_cq(cq, IB_POLL_BUDGET_WORKQUEUE, 
>> cq->wc,
>>                       IB_POLL_BATCH);
>> +
>
> newline?

Same as above.

>
>>       if (completed >= IB_POLL_BUDGET_WORKQUEUE ||
>>           ib_req_notify_cq(cq, IB_POLL_FLAGS) > 0)
>>           queue_work(cq->comp_wq, &cq->work);
>> +    else if (cq->dim)
>> +        rdma_dim(cq->dim, completed);
>>   }
>>     static void ib_cq_completion_workqueue(struct ib_cq *cq, void 
>> *private)
>> @@ -166,6 +222,8 @@ struct ib_cq *__ib_alloc_cq_user(struct ib_device 
>> *dev, void *private,
>>       rdma_restrack_set_task(&cq->res, caller);
>>       rdma_restrack_kadd(&cq->res);
>>   +    rdma_dim_init(cq);
>> +
>>       switch (cq->poll_ctx) {
>>       case IB_POLL_DIRECT:
>>           cq->comp_handler = ib_cq_completion_direct;
>> @@ -173,7 +231,13 @@ struct ib_cq *__ib_alloc_cq_user(struct 
>> ib_device *dev, void *private,
>>       case IB_POLL_SOFTIRQ:
>>           cq->comp_handler = ib_cq_completion_softirq;
>>   -        irq_poll_init(&cq->iop, IB_POLL_BUDGET_IRQ, ib_poll_handler);
>> +        if (cq->dim) {
>> +            irq_poll_init(&cq->iop, IB_POLL_BUDGET_IRQ,
>> +                      ib_poll_dim_handler);
>> +        } else
>> +            irq_poll_init(&cq->iop, IB_POLL_BUDGET_IRQ,
>> +                      ib_poll_handler);
>> +
>>           ib_req_notify_cq(cq, IB_CQ_NEXT_COMP);
>>           break;
>>       case IB_POLL_WORKQUEUE:
>> @@ -226,6 +290,9 @@ void ib_free_cq_user(struct ib_cq *cq, struct 
>> ib_udata *udata)
>>           WARN_ON_ONCE(1);
>>       }
>>   +    if (cq->dim)
>> +        cancel_work_sync(&cq->dim->work);
>> +    kfree(cq->dim);
>>       kfree(cq->wc);
>>       rdma_restrack_del(&cq->res);
>>       ret = cq->device->ops.destroy_cq(cq, udata);
>> diff --git a/drivers/infiniband/hw/mlx5/main.c 
>> b/drivers/infiniband/hw/mlx5/main.c
>> index abac70ad5c7c..b1b45dbe24a5 100644
>> --- a/drivers/infiniband/hw/mlx5/main.c
>> +++ b/drivers/infiniband/hw/mlx5/main.c
>> @@ -6305,6 +6305,8 @@ static int mlx5_ib_stage_caps_init(struct 
>> mlx5_ib_dev *dev)
>>            MLX5_CAP_GEN(dev->mdev, disable_local_lb_mc)))
>>           mutex_init(&dev->lb.mutex);
>>   +    dev->ib_dev.use_cq_dim = true;
>> +
>
> Please don't. This is a bad choice to opt it in by default.