[dpdk-dev] [PATCH 1/2] eal: clean up interrupt handle

Jan Blunck jblunck at infradead.org
Mon Feb 27 17:19:12 CET 2017


On Wed, Feb 22, 2017 at 11:17 PM, Qi Zhang <qi.z.zhang at intel.com> wrote:
> --- a/lib/librte_eal/linuxapp/eal/eal_interrupts.c
> +++ b/lib/librte_eal/linuxapp/eal/eal_interrupts.c
> @@ -278,29 +278,6 @@ vfio_disable_msi(const struct rte_intr_handle *intr_handle) {
>         return ret;
>  }
>
> -static int
> -get_max_intr(const struct rte_intr_handle *intr_handle)
> -{
> -       struct rte_intr_source *src;
> -
> -       TAILQ_FOREACH(src, &intr_sources, next) {
> -               if (src->intr_handle.fd != intr_handle->fd)
> -                       continue;
> -
> -               if (src->intr_handle.max_intr < intr_handle->max_intr)
> -                       src->intr_handle.max_intr = intr_handle->max_intr;
> -               if (!src->intr_handle.max_intr)
> -                       src->intr_handle.max_intr = 1;
> -               else if (src->intr_handle.max_intr > RTE_MAX_RXTX_INTR_VEC_ID)
> -                       src->intr_handle.max_intr
> -                               = RTE_MAX_RXTX_INTR_VEC_ID + 1;
> -
> -               return src->intr_handle.max_intr;
> -       }
> -
> -       return -1;
> -}
> -
>  /* enable MSI-X interrupts */
>  static int
>  vfio_enable_msix(const struct rte_intr_handle *intr_handle) {
> @@ -313,15 +290,10 @@ vfio_enable_msix(const struct rte_intr_handle *intr_handle) {
>
>         irq_set = (struct vfio_irq_set *) irq_set_buf;
>         irq_set->argsz = len;
> -
> -       ret = get_max_intr(intr_handle);
> -       if (ret < 0) {
> -               RTE_LOG(ERR, EAL, "Invalid number of MSI-X irqs for fd %d\n",
> -                       intr_handle->fd);
> -               return -1;
> -       }
> -
> -       irq_set->count = ret;
> +       /* 0 < irq_set->count < RTE_MAX_RXTX_INTR_VEC_ID + 1 */
> +       irq_set->count = intr_handle->max_intr ?
> +               (intr_handle->max_intr > RTE_MAX_RXTX_INTR_VEC_ID + 1 ?
> +               RTE_MAX_RXTX_INTR_VEC_ID + 1 : intr_handle->max_intr) : 1;
>         irq_set->flags = VFIO_IRQ_SET_DATA_EVENTFD | VFIO_IRQ_SET_ACTION_TRIGGER;
>         irq_set->index = VFIO_PCI_MSIX_IRQ_INDEX;
>         irq_set->start = 0;

The changes (to not change the interrupt handle in intr_sources) seems
to be unrelated to the API changes. Can you split this into two
commits, please?

Also I'm not 100% convinced that the low-level drivers should make
extensive use of the ethdev's const intr_handle. I believe that the
ethdev ops might be incomplete in that sense that it would be better
to add an rx_intr_ctl() operation to the ethdev ops structure and pass
control the the low-level device.


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