linux-toradex.git/arch/mips/net, branch v4.3-rc2

MIPS: BPF: Introduce BPF ASM helpers

2015-06-21T19:54:25+00:00

This commit introduces BPF ASM helpers for MIPS and MIPS64 kernels.
The purpose of this patch is to twofold:

1) We are now able to handle negative offsets instead of either
falling back to the interpreter or to simply not do anything and
bail out.

2) Optimize reads from the packet header instead of calling the C
helpers

Because of this patch, we are now able to get rid of quite a bit of
code in the JIT generation process by using MIPS optimized assembly
code. The new assembly code makes the test_bpf testsuite happy with
all 60 test passing successfully compared to the previous
implementation where 2 tests were failing.
Doing some basic analysis in the results between the old
implementation and the new one we can obtain the following
summary running current mainline on an ER8 board (+/- 30us delta is
ignored to prevent noise from kernel scheduling or IRQ latencies):

Summary: 22 tests are faster, 7 are slower and 47 saw no improvement

with the most notable improvement being the tcpdump tests. The 7 tests
that seem to be a bit slower is because they all follow the slow path
(bpf_internal_load_pointer_neg_helper) which is meant to be slow so
that's not a problem.

Signed-off-by: Markos Chandras 
Cc: netdev@vger.kernel.org
Cc: "David S. Miller" 
Cc: Alexei Starovoitov 
Cc: Daniel Borkmann 
Cc: Hannes Frederic Sowa 
Cc: linux-kernel@vger.kernel.org
Cc: linux-mips@linux-mips.org
Cc: netdev@vger.kernel.org
Patchwork: http://patchwork.linux-mips.org/patch/10530/
Signed-off-by: Ralf Baechle

MIPS: BPF: Use BPF register names to describe the ABI

2015-06-21T19:54:24+00:00

Use the BPF register names instead of the arch register names to
document how the ABI is structured.

Signed-off-by: Markos Chandras 
Cc: netdev@vger.kernel.org
Cc: "David S. Miller" 
Cc: Alexei Starovoitov 
Cc: Daniel Borkmann 
Cc: Hannes Frederic Sowa 
Cc: linux-kernel@vger.kernel.org
Patchwork: http://patchwork.linux-mips.org/patch/10529/
Signed-off-by: Ralf Baechle

MIPS: BPF: Move register definition to the BPF header

2015-06-21T19:54:24+00:00

The registers will be used by a subsequent patch introducing
ASM helpers so move them to a common header.

Signed-off-by: Markos Chandras 
Cc: netdev@vger.kernel.org
Cc: "David S. Miller" 
Cc: Alexei Starovoitov 
Cc: Daniel Borkmann 
Cc: Hannes Frederic Sowa 
Cc: linux-kernel@vger.kernel.org
Cc: linux-mips@linux-mips.org
Patchwork: http://patchwork.linux-mips.org/patch/10528/
Signed-off-by: Ralf Baechle

MIPS: net: BPF: Replace RSIZE with SZREG

2015-06-21T19:54:23+00:00

The RSZIE was used to determine the register width but MIPS
already defines SZREG so use that instead.

Cc: netdev@vger.kernel.org
Cc: "David S. Miller" 
Cc: Alexei Starovoitov 
Cc: Daniel Borkmann 
Cc: Hannes Frederic Sowa 
Cc: linux-kernel@vger.kernel.org
Cc: linux-mips@linux-mips.org
Cc: netdev@vger.kernel.org
Patchwork: http://patchwork.linux-mips.org/patch/10526/
Signed-off-by: Markos Chandras 
Signed-off-by: Ralf Baechle

MIPS: BPF: Free up some callee-saved registers

2015-06-21T19:54:22+00:00

Move the two scratch registers from s0 and s1 to t4 and t5 in order
to free up some callee-saved registers. We will use these callee-saved
registers to store some permanent data on them in a subsequent patch.

Signed-off-by: Markos Chandras 
Cc: netdev@vger.kernel.org
Cc: "David S. Miller" 
Cc: Alexei Starovoitov 
Cc: Daniel Borkmann 
Cc: Hannes Frederic Sowa 
Cc: linux-kernel@vger.kernel.org
Cc: linux-mips@linux-mips.org
Patchwork: http://patchwork.linux-mips.org/patch/10525/
Signed-off-by: Ralf Baechle

MIPS: BPF: Fix stack pointer allocation

2015-06-06T08:21:10+00:00

Fix stack pointer offset which could potentially corrupt
argument registers in the previous frame. The calculated offset
reflects the size of all the registers we need to preserve so there
is no need for this erroneous subtraction.

[ralf@linux-mips.org: Fixed conflict due to only applying this fix part
of the entire series as part of 4.1 fixes.]

Signed-off-by: Markos Chandras 
Cc: netdev@vger.kernel.org
Cc: "David S. Miller" 
Cc: Alexei Starovoitov 
Cc: Daniel Borkmann 
Cc: Hannes Frederic Sowa 
Cc: linux-kernel@vger.kernel.org
Cc: linux-mips@linux-mips.org
Patchwork: http://patchwork.linux-mips.org/patch/10527/
Signed-off-by: Ralf Baechle

module: remove mod arg from module_free, rename module_memfree().

2015-01-20T01:08:33+00:00

Nothing needs the module pointer any more, and the next patch will
call it from RCU, where the module itself might no longer exist.
Removing the arg is the safest approach.

This just codifies the use of the module_alloc/module_free pattern
which ftrace and bpf use.

Signed-off-by: Rusty Russell 
Acked-by: Alexei Starovoitov 
Cc: Mikael Starvik 
Cc: Jesper Nilsson 
Cc: Ralf Baechle 
Cc: Ley Foon Tan 
Cc: Benjamin Herrenschmidt 
Cc: Chris Metcalf 
Cc: Steven Rostedt 
Cc: x86@kernel.org
Cc: Ananth N Mavinakayanahalli 
Cc: Anil S Keshavamurthy 
Cc: Masami Hiramatsu 
Cc: linux-cris-kernel@axis.com
Cc: linux-kernel@vger.kernel.org
Cc: linux-mips@linux-mips.org
Cc: nios2-dev@lists.rocketboards.org
Cc: linuxppc-dev@lists.ozlabs.org
Cc: sparclinux@vger.kernel.org
Cc: netdev@vger.kernel.org

mips: bpf: Fix broken BPF_MOD

2014-12-09T01:22:30+00:00

Remove optimize_div() from BPF_MOD | BPF_K case
since we don't know the dividend and fix the
emit_mod() by reading the mod operation result from HI register

Signed-off-by: Denis Kirjanov 
Reviewed-by: Markos Chandras 
Signed-off-by: David S. Miller

Merge branch 'upstream' of git://git.linux-mips.org/pub/scm/ralf/upstream-linus

2014-10-18T21:24:36+00:00

Pull MIPS updates from Ralf Baechle:
 "This is the MIPS pull request for the next kernel:

   - Zubair's patch series adds CMA support for MIPS.  Doing so it also
     touches ARM64 and x86.
   - remove the last instance of IRQF_DISABLED from arch/mips
   - updates to two of the MIPS defconfig files.
   - cleanup of how cache coherency bits are handled on MIPS and
     implement support for write-combining.
   - platform upgrades for Alchemy
   - move MIPS DTS files to arch/mips/boot/dts/"

* 'upstream' of git://git.linux-mips.org/pub/scm/ralf/upstream-linus: (24 commits)
  MIPS: ralink: remove deprecated IRQF_DISABLED
  MIPS: pgtable.h: Implement the pgprot_writecombine function for MIPS
  MIPS: cpu-probe: Set the write-combine CCA value on per core basis
  MIPS: pgtable-bits: Define the CCA bit for WC writes on Ingenic cores
  MIPS: pgtable-bits: Move the CCA bits out of the core's ifdef blocks
  MIPS: DMA: Add cma support
  x86: use generic dma-contiguous.h
  arm64: use generic dma-contiguous.h
  asm-generic: Add dma-contiguous.h
  MIPS: BPF: Add new emit_long_instr macro
  MIPS: ralink: Move device-trees to arch/mips/boot/dts/
  MIPS: Netlogic: Move device-trees to arch/mips/boot/dts/
  MIPS: sead3: Move device-trees to arch/mips/boot/dts/
  MIPS: Lantiq: Move device-trees to arch/mips/boot/dts/
  MIPS: Octeon: Move device-trees to arch/mips/boot/dts/
  MIPS: Add support for building device-tree binaries
  MIPS: Create common infrastructure for building built-in device-trees
  MIPS: SEAD3: Enable DEVTMPFS
  MIPS: SEAD3: Regenerate defconfigs
  MIPS: Alchemy: DB1300: Add touch penirq support
  ...

next: mips: bpf: Fix build failure

2014-09-30T20:54:51+00:00

Fix:

arch/mips/net/bpf_jit.c: In function 'build_body':
arch/mips/net/bpf_jit.c:762:6: error: unused variable 'tmp'
cc1: all warnings being treated as errors
make[2]: *** [arch/mips/net/bpf_jit.o] Error 1

Seen when building mips:allmodconfig in -next since next-20140924.

Signed-off-by: Guenter Roeck 
Signed-off-by: David S. Miller