[DPDK/ethdev Bug 1664] rte_ipv6_addr_is_v4mapped wrong logic

[bugzilla@dpdk.org]

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https://bugs.dpdk.org/show_bug.cgi?id=1664

            Bug ID: 1664
           Summary: rte_ipv6_addr_is_v4mapped wrong logic
           Product: DPDK
           Version: unspecified
          Hardware: All
                OS: All
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: ethdev
          Assignee: dev@dpdk.org
          Reporter: sunnylandh@gmail.com
  Target Milestone: ---

rte_ipv6_addr_is_v4mapped() is implemented by comparing the first 32 bits of an
IPv6 address with the ::ffff:0.0.0.0/96 prefix.
https://git.dpdk.org/dpdk/tree/lib/net/rte_ip6.h?id=fba9875559906e04eaeb74532f4cfd51194259a2#n313

The following snippet prints "1", but the loopback address is not a v4mapped
address.

#include <stdio.h>
#include <rte_ip6.h>

int main() {
  struct rte_ipv6_addr a = RTE_IPV6_ADDR_LOOPBACK;
  printf("%d\n", rte_ipv6_addr_is_v4mapped(&a));
}

The function should compare the first 96 bits instead.

rte_ipv6_addr_is_v4compat() has the same mistake.

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