Unbreakable Enterprise kernel security update

[4.1.12-124.20.1]

• bnxt_en: xdp: don’t make drivers report attachment mode (partial backport) (Somasundaram Krishnasamy) [Orabug: 27988326]
• bpf: make bnxt compatible w/ bpf_xdp_adjust_tail (Nikita V. Shirokov) [Orabug: 27988326]
• bnxt_en: add meta pointer for direct access (partial backport) (Somasundaram Krishnasamy) [Orabug: 27988326]
• bnxt_en: Fix bug in ethtool -L. (Michael Chan) [Orabug: 27988326]
• bpf: bnxt: Report bpf_prog ID during XDP_QUERY_PROG (Martin KaFai Lau) [Orabug: 27988326]
• bnxt_en: Optimize doorbell write operations for newer chips (reapply). (Michael Chan) [Orabug: 27988326]
• bnxt_en: Use short TX BDs for the XDP TX ring. (Michael Chan) [Orabug: 27988326]
• bnxt_en: Add ethtool mac loopback self test (reapply). (Michael Chan) [Orabug: 27988326]
• bnxt_en: Add support for XDP_TX action. (Michael Chan) [Orabug: 27988326]
• bnxt_en: Add basic XDP support. (Michael Chan) [Orabug: 27988326]
• x86/ia32: Restore r8 correctly in 32bit SYSCALL instruction entry. (Gayatri Vasudevan) [Orabug: 28529706]
• net: enable RPS on vlan devices (Shannon Nelson) [Orabug: 28645929]
• xen-blkback: hold write vbd-lock while swapping the vbd (Ankur Arora) [Orabug: 28651655]
• xen-blkback: implement swapping of active vbd (Ankur Arora) [Orabug: 28651655]
• xen-blkback: emit active physical device to xenstore (Ankur Arora) [Orabug: 28651655]
• xen-blkback: refactor backend_changed() (Ankur Arora) [Orabug: 28651655]
• xen-blkback: pull out blkif grant features from vbd (Ankur Arora) [Orabug: 28651655]
• mm: get rid of vmacache_flush_all() entirely (Linus Torvalds) [Orabug: 28701016] {CVE-2018-17182}
  [4.1.12-124.19.9]
• rds: crash at rds_ib_inc_copy_to_user+104 due to NULL ptr reference (Venkat Venkatsubra) [Orabug: 28506569]
  [4.1.12-124.19.8]
• IB/core: For multicast functions, verify that LIDs are multicast LIDs (Michael J. Ruhl) [Orabug: 28700490]