On Wed, 2017-11-08 at 11:57 +0200, Sagi Grimberg wrote:
> +struct ib_cq *ib_find_get_cq(struct ib_device *dev, unsigned int nr_cqe,
> + enum ib_poll_context poll_ctx, int affinity_hint)
> +{
> + struct ib_cq *cq, *found;
> + unsigned long flags;
> + int vector, ret;
> +
> + if (poll_ctx >= ARRAY_SIZE(dev->cq_pools))
> + return ERR_PTR(-EINVAL);
> +
> + if (!ib_find_vector_affinity(dev, affinity_hint, &vector)) {
> + /*
> + * Couldn't find matching vector affinity so project
> + * the affinty to the device completion vector range
> + */
> + vector = affinity_hint % dev->num_comp_vectors;
> + }
So depending on whether or not the HCA driver implements .get_vector_affinity()
either pci_irq_get_affinity() is used or "vector = affinity_hint %
dev->num_comp_vectors"? Sorry but I think that kind of differences makes it
unnecessarily hard for ULP maintainers to provide predictable performance and
consistent behavior across HCAs.
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