Revert "loopback: Clear hash unconditionally."
This reverts commit 2fe37927d41990abe8d1c336e75fd75873285e90.
This turns out to have been misguided. First, clearing the
hash results in all loopback ip/ip6 traffic being hashed
to the netisr queue associated with the if_index of the loopback
interface. Eg, it bottlenecks loopback traffic. When the
hash is kept, traffic is spread evenly among netisrs.
Also, it is safe to keep the hash here. The clearing was only
needed when RSS core selection is enabled; we only enabled the
consistent hashing parts of RSS globally, not the cpuid mapping
stuff. So there is no need to clear it.
Reviewed by: glebius
Sponsored by: Netflix
ipfw: fix checksum after NAT
When checksum offloading is used, IPFW needs to fix the checksum
after libalias has done NAT. The ipfw_nat() function does so, but
only for mbufs without a receiving interface. However, if, for example,
the packet was sent inside a jail that used checksum offloading over
an epair, ipfw still needs to fix the checksum even though the mbuf
has set a receiving interface (epair).
This patch just removes the check whether a receiving interface is set.
PR: 295057
Reviewed by: tuexen
Differential Revision: https://reviews.freebsd.org/D57091
(cherry picked from commit 81b47a7c604f1d563283759572fa7a1f9d4dc56f)
