[dpdk-dev] [Bug 413] rte_ring: capacity was set uncorrectly

[bugzilla at dpdk.org]

https://bugs.dpdk.org/show_bug.cgi?id=413

            Bug ID: 413
           Summary: rte_ring: capacity was set uncorrectly
           Product: DPDK
           Version: unspecified
          Hardware: All
                OS: All
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: core
          Assignee: dev at dpdk.org
          Reporter: 781345688 at qq.com
  Target Milestone: ---

In function `rte_ring_init()` in `lib/librte_ring/rte_ring.c`, `capacity` was
set to `mask` when count was power of 2, while `mask` was set to `count - 1`.
But when specified with flag `RING_F_EXACT_SZ`, `capacity` was set to `count`.
I think `capacity` should be set to `count` anyway. It's illogical when you
create a ring of count 4096 but you can only use 4095 of it. And when you
create a ring of count 4095, you can use 4095 of it. Their logic should be
identical.

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