Optimize BPF tailcall for LoongArch [LWN.net]

From:		Tiezhu Yang <yangtiezhu-AT-loongson.cn>
To:		Huacai Chen <chenhuacai-AT-kernel.org>, Hengqi Chen <hengqi.chen-AT-gmail.com>
Subject:		[PATCH v1 0/4] Optimize BPF tailcall for LoongArch
Date:		Tue, 30 Jun 2026 10:27:01 +0800
Message-ID:		<20260630022705.11536-1-yangtiezhu@loongson.cn>
Cc:		loongarch-AT-lists.linux.dev, bpf-AT-vger.kernel.org, linux-kernel-AT-vger.kernel.org
Archive-link:		Article

Based on 7.2-rc1, tested on a Loongson-3A6000 physical machine.

Here are the test results:

  $ sudo modprobe test_bpf test_suite=test_tail_calls
  $ dmesg -t | tail -1
  test_bpf: test_tail_calls: Summary: 10 PASSED, 0 FAILED, [10/10 JIT'ed]
  $ sudo ./test_progs -t tailcalls | tail -1
  Summary: 1/37 PASSED, 0 SKIPPED, 0 FAILED

Tiezhu Yang (4):
  LoongArch: BPF: Optimize redundant TCC loads in epilogue
  LoongArch: BPF: Move arena register slot below TCC context
  LoongArch: BPF: Refactor jump offset calculation in tail call
  LoongArch: BPF: Implement branchless conditional move for TCC

 arch/loongarch/include/asm/inst.h |   6 ++
 arch/loongarch/net/bpf_jit.c      | 112 +++++++++++++++---------------
 2 files changed, 63 insertions(+), 55 deletions(-)

-- 
2.42.0