Commit graph

536,164 commits

Author SHA1 Message Date
Maciej W. Rozycki
ed2d72c1eb MIPS: Respect the FCSR exception mask for `si_code'
Respect the FCSR exception mask when interpreting the IEEE 754 exception
condition to report with SIGFPE in `si_code', so as not to use one that
has been masked where a different one set in parallel caused the FPE
hardware exception to trigger.  As per the IEEE Std 754 the Inexact
exception can happen together with Overflow or Underflow.

Signed-off-by: Maciej W. Rozycki <macro@linux-mips.org>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/9703/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2015-04-08 01:10:15 +02:00
Maciej W. Rozycki
cfafc4feb3 MIPS: math-emu: Move long fixed-point support into an `ar' library
Complement 593d33fe [MIPS: math-emu: Move various objects into an ar
library.] and also move sp_tlong.o, sp_flong.o, dp_tlong.o, and
dp_flong.o into an `ar' library.  These objects implement long
fixed-point format support that can be omitted from MIPS I, MIPS II and
MIPS32r1 configurations.

Signed-off-by: Maciej W. Rozycki <macro@linux-mips.org>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/9702/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2015-04-08 01:10:12 +02:00
Maciej W. Rozycki
9ab4471c9f MIPS: math-emu: Correct delay-slot exception propagation
Restore EPC at the branch whose delay slot is emulated if the delay-slot
instruction signals.  This is so that code in `fpu_emulator_cop1Handler'
does not see EPC having advanced and mistakenly successfully resume
userland execution from the location at the branch target in that case.
Restoring EPC guarantees an immediate exit from the emulation loop and
if EPC hasn't advanced at all since entering the loop, also issuing the
signal reported by the delay-slot instruction.

Signed-off-by: Maciej W. Rozycki <macro@linux-mips.org>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/9701/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2015-04-08 01:10:09 +02:00
Maciej W. Rozycki
2d83fea786 MIPS: Correct FP ISA requirements
Correct ISA requirements for floating-point instructions:

* the CU3 exception signifies a real COP3 instruction in MIPS I & II,

* the BC1FL and BC1TL instructions are not supported in MIPS I,

* the SQRT.fmt instructions are indeed supported in MIPS II,

* the LDC1 and SDC1 instructions are indeed supported in MIPS32r1,

* the CEIL.W.fmt, FLOOR.W.fmt, ROUND.W.fmt and TRUNC.W.fmt instructions
  are indeed supported in MIPS32,

* the CVT.L.fmt and CVT.fmt.L instructions are indeed supported in
  MIPS32r2 and MIPS32r6,

* the CEIL.L.fmt, FLOOR.L.fmt, ROUND.L.fmt and TRUNC.L.fmt instructions
  are indeed supported in MIPS32r2 and MIPS32r6,

* the RSQRT.fmt and RECIP.fmt instructions are indeed supported in
  MIPS64r1,

Also simplify conditionals for MIPS III and MIPS IV FPU instructions and
the handling of the MOVCI minor opcode.

Signed-off-by: Maciej W. Rozycki <macro@linux-mips.org>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/9700/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2015-04-08 01:10:05 +02:00
Maciej W. Rozycki
80cbfad790 MIPS: Correct MIPS I FP context layout
Implement the correct ordering of individual floating-point registers
within double-precision register pairs for the MIPS I FP context, as
required by our FP emulation code and expected by userland talking via
ptrace(2).  Use L.D and S.D assembly macros that do the right thing like
LDC1 and SDC1 from MIPS II up, avoiding the need to mess up with
endianness conditionals.

This in particular fixes the handling of denormals and NaN generation in
Unimplemented Operation emulation traps.

Signed-off-by: Maciej W. Rozycki <macro@linux-mips.org>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/9699/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2015-04-08 01:10:03 +02:00
Maciej W. Rozycki
7737b20b9e MIPS: math-emu: Fix delay-slot emulation cache incoherency
Correct a cache coherency regression introduced with be1664c4 [Another
round of fixes for the fp emulator.] for the emulation frame used in
delay-slot emulation.

Two instructions are copied into the frame and as from the commit
referred a cache synchronisation call is made for the second instruction
aka `badinst' of the two only.  The `flush_cache_sigtramp' interface is
reused that guarantees that synchronisation will be made for 8 bytes or
2 instructions starting from the address requested, although if cache
lines are wider then a larger area may be synchronised.

Change the call to point to the first of the two instructions aka `emul'
instead, removing unpredictable behaviour resulting from cache
incoherency.

This bug only ever manifested itself on systems implementing 4-byte
cache lines, typically MIPS I systems, causing all kinds of weirdness.
This is because the sequence of two instructions starting from `emul' is
8-byte aligned and for 8-byte or wider cache lines the line synchronised
will span both, so the vast majority of systems have escaped unharmed.

Signed-off-by: Maciej W. Rozycki <macro@linux-mips.org>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/9698/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2015-04-08 01:10:00 +02:00
Maciej W. Rozycki
c987503201 MIPS: Fix BREAK code interpretation heuristics
Do not lose the other half of the BREAK code where there is an upper
half.  This is so that e.g. `BREAK 7, 7' is not interpreted as a divide
by zero trap, while `BREAK 0, 7' or `BREAK 7, 0' still are.

Signed-off-by: Maciej W. Rozycki <macro@linux-mips.org>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/9697/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2015-04-08 01:09:58 +02:00
Maciej W. Rozycki
f6a31da501 MIPS: BREAK instruction interpretation corrections
Add the missing microMIPS BREAK16 instruction code interpretation and
reshape code removing instruction fetching duplication and the separate
call to `do_trap_or_bp' in the MIPS16 path.

Signed-off-by: Maciej W. Rozycki <macro@linux-mips.org>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/9696/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2015-04-08 01:09:55 +02:00
Maciej W. Rozycki
68893e0051 MIPS: Correct MIPS16 BREAK code interpretation
Correct the interpretation of the immediate MIPS16 BREAK instruction
code embedded in the instruction word across bits 10:5 rather than 11:6
as current code implies, fixing the interpretation of integer overflow
and divide by zero traps.

Signed-off-by: Maciej W. Rozycki <macro@linux-mips.org>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/9695/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2015-04-08 01:09:53 +02:00
Maciej W. Rozycki
18a2c2c6b9 MIPS: Correct `nofpu' non-functionality
The `cpu_has_fpu' feature flag must not be hardcoded to 1 or the `nofpu'
kernel option will be ignored.  Remove any such overrides and add a
cautionary note.  Hardcoding to 0 is fine for FPU-less platforms.

Signed-off-by: Maciej W. Rozycki <macro@linux-mips.org>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/9694/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2015-04-08 01:09:49 +02:00
Maciej W. Rozycki
e06b530b92 MIPS: math-emu: Make NaN classifiers static
The `ieee754sp_isnan' and `ieee754dp_isnan' NaN classifiers are now no
longer externally referred, remove their header prototypes and make them
local to the two only respective places still making use of them.

Signed-off-by: Maciej W. Rozycki <macro@linux-mips.org>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/9693/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2015-04-08 01:09:47 +02:00
Maciej W. Rozycki
b0c2f8fbdb MIPS: math-emu: Optimise qNaN handling in `ieee754sp_fdp'
Rewrite qNaN handling in `ieee754sp_fdp' using the `ieee754_class_nan'
helper recently added, removing the external call to `ieee754sp_isnan'
and reducing the size of code by 16 instructions or 64 bytes.

Signed-off-by: Maciej W. Rozycki <macro@linux-mips.org>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/9692/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2015-04-08 01:09:44 +02:00
Maciej W. Rozycki
42fa242421 MIPS: math-emu: Remove dead comparison helpers
None of the comparison helpers in ieee754.h is used, remove them.

Signed-off-by: Maciej W. Rozycki <macro@linux-mips.org>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/9691/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2015-04-08 01:09:42 +02:00
Maciej W. Rozycki
bd267a5305 MIPS: math-emu: Remove redundant code from NaN comparison
Remove a redundant call to `ieee754_setandtestcx' in `ieee754sp_cmp' and
`ieee754dp_cmp'.  The IEEE 754 exception requested will have already
been set by a call to `ieee754_setcx' immediately above, because `sig'
has to be non-zero to reach here, and the comparison result returned
will be 0 regardless of the result from the call.  Simplify the return
expression remaining.  All this reducing the size of code by 16 and 12
instructions or 64 and 48 bytes respectively.

Signed-off-by: Maciej W. Rozycki <macro@linux-mips.org>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/9690/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2015-04-08 01:09:38 +02:00
Maciej W. Rozycki
c9a1084516 MIPS: math-emu: Optimise NaN handling in comparisons
We have the input operands already classified in `ieee754sp_cmp' and
`ieee754dp_cmp' comparison operations, so use the class obtained to tell
NaNs and numbers apart rather than classifying inputs again for this
purpose, reducing the size of code by 24 and 40 instructions or 96 and
160 bytes respectively.

Signed-off-by: Maciej W. Rozycki <macro@linux-mips.org>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/9689/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2015-04-08 01:09:35 +02:00
Maciej W. Rozycki
d5afa7e905 MIPS: math-emu: Reinstate sNaN quieting handlers
Revert the changes made by commit fdffbafb [Lots of FPU bug fixes from
Kjeld Borch Egevang.] to `ieee754sp_nanxcpt' and `ieee754dp_nanxcpt'
sNaN quieting handlers and their callers so that sNaN processing is done
within the handlers againg.  Pass the sNaN causing an IEEE 754 invalid
operation exception down to the relevant handler.  Pass the sNaN in `fs'
where two sNaNs are supplied to a binary operation.

Set the Invalid Operation FCSR exception bits in the quieting handlers
rather than at their call sites throughout.  Make the handlers exclusive
for sNaN processing.

Signed-off-by: Maciej W. Rozycki <macro@linux-mips.org>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/9688/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2015-04-08 01:09:31 +02:00
Maciej W. Rozycki
539bfb579b MIPS: math-emu: Don't pass qNaNs through quieting handlers
Don't call the `ieee754sp_nanxcpt' and `ieee754dp_nanxcpt' sNaN quieting
handlers for a qNaN supplied to floating-point format conversions or
SQRT.S/SQRT.D instructions, or for a qNaN produced out of a negative
operand supplied to SQRT.S/SQRT.D instructions.  Return the qNaN right
away in these cases.

Signed-off-by: Maciej W. Rozycki <macro@linux-mips.org>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/9687/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2015-04-08 01:09:29 +02:00
Maciej W. Rozycki
d19cf86e2e MIPS: math-emu: Factor out NaN FP format conversions
Signed-off-by: Maciej W. Rozycki <macro@linux-mips.org>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/9686/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2015-04-08 01:09:26 +02:00
Maciej W. Rozycki
ec98f9a01f MIPS: math-emu: Update sNaN quieting handlers
Commit fdffbafb [Lots of FPU bug fixes from Kjeld Borch Egevang.]
replaced the two single `ieee754sp_nanxcpt' and `ieee754dp_nanxcpt'
places, where sNaN quieting used to happen for single and double
floating-point operations respectively, with individual qNaN
instantiations across all the call sites instead.  It also made most of
these two functions dead code as where called on a qNaN they return
right away.

To revert the damage and make sNaN quieting uniform again first rewrite
`ieee754sp_nanxcpt' and `ieee754dp_nanxcpt' to do the same quieting all
the call sites do, that is return the default qNaN encoding for all
input sNaN values; never propagate any sNaN payload bits from its
trailing significand field.

Signed-off-by: Maciej W. Rozycki <macro@linux-mips.org>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/9685/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2015-04-08 01:09:23 +02:00
Maciej W. Rozycki
1f6d2c29b0 MIPS: Use FPU_CSR_ALL_X' in __build_clear_fpe'
Replace a hardcoded numeric bitmask for FCSR cause bits with
`FPU_CSR_ALL_X' in `__build_clear_fpe'.

Signed-off-by: Maciej W. Rozycki <macro@linux-mips.org>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/9684/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2015-04-08 01:09:20 +02:00
Maciej W. Rozycki
27e28e8ec4 MIPS: Normalise code flow in the CpU exception handler
Changes applied to `do_cpu' over time reduced the use of the SIGILL
issued with `force_sig' at the end to a single CU3 case only in the
switch statement there.  Move that `force_sig' call over to right where
required then and toss out the pile of gotos now not needed to skip over
the call, replacing them with regular breaks out of the switch.

Signed-off-by: Maciej W. Rozycki <macro@linux-mips.org>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/9683/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2015-04-08 01:09:18 +02:00
Maciej W. Rozycki
d4f5b08893 MIPS: math-emu: Factor out CFC1/CTC1 emulation
Move CFC1/CTC1 emulation code to separate functions to avoid excessive
indentation in forthcoming changes.  Adjust formatting in a minor way
and remove extraneous round brackets.

Signed-off-by: Maciej W. Rozycki <macro@linux-mips.org>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/9682/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2015-04-08 01:09:15 +02:00
Maciej W. Rozycki
cb5d4aad68 MIPS: bitops.h: Avoid inline asm for constant FLS
GCC is smart enough to substitute the final result for FLS calculations
as implemented in the fallback C code we have in `__fls' and `fls'
applied to constant values.  The presence of inline asm defeats the
compiler though, forcing it to emit extraneous CLZ/DCLZ calculation for
processors that support these instructions.

Use `__builtin_constant_p' then to avoid inline asm altogether for
constants.

Signed-off-by: Maciej W. Rozycki <macro@linux-mips.org>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/9681/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2015-04-08 01:09:12 +02:00
Maciej W. Rozycki
2cfcf8a831 MIPS: math-emu: Remove `modeindex' macro
Commit 56a64733 [MIPS: math-emu: Switch to using the MIPS rounding
modes.] removed the distinction between hardware and emulator rounding
mode encodings, the hardware encoding is now used in emulation as well.
Complement the change and remove the `modeindex' macro previously used
for indexing into encoding translation tables, it now does nothing and
only obfuscates code by reinserting the value extracted from FCSR.
Adjust comments accordingly.

Signed-off-by: Maciej W. Rozycki <macro@linux-mips.org>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/9680/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2015-04-08 01:09:10 +02:00
Maciej W. Rozycki
4a7c237182 MIPS: Reindent R6 RI exception emulation
Fold a nested `if' statement for the R6 case in `do_ri' into its
containing `if' block, removing excessive indentation causing code to
extend beyond 79 columns.

Signed-off-by: Maciej W. Rozycki <macro@linux-mips.org>
Cc: Leonid Yegoshin <Leonid.Yegoshin@imgtec.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/9679/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2015-04-08 01:09:06 +02:00
Maciej W. Rozycki
fad0bfdb89 MIPS: mips-r2-to-r6-emul.h: Inline empty `mipsr2_decoder'
Use `static inline' rather than `static __maybe_unused' for
`mipsr2_decoder' in the empty case, making inlining explicit where it
will happen anyway.

Signed-off-by: Maciej W. Rozycki <macro@linux-mips.org>
Cc: Leonid Yegoshin <Leonid.Yegoshin@imgtec.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/9678/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2015-04-08 01:09:04 +02:00
Maciej W. Rozycki
a49dc4276e MIPS: ELF: Drop `get_fp_abi'
Commit 46490b57 [MIPS: kernel: elf: Improve the overall ABI and FPU mode
checks] reduced `get_fp_abi' to an elaborate pass-through.  Drop it
then.

Signed-off-by: Maciej W. Rozycki <macro@linux-mips.org>
Cc: Markos Chandras <markos.chandras@imgtec.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/9677/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2015-04-08 01:09:01 +02:00
Maciej W. Rozycki
b844bc781b MIPS: math-emu: Fix oversize lines in comparisons
Signed-off-by: Maciej W. Rozycki <macro@linux-mips.org>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/9676/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2015-04-08 01:08:58 +02:00
Maciej W. Rozycki
241e9c465f MIPS: Correct the comment for and reformat `movf_func'
Correct a copy-and-paste issue with the description for `movf_func'
referring to `movt_func'.  Reformat the former function to match the
latter.

Signed-off-by: Maciej W. Rozycki <macro@linux-mips.org>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/9675/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2015-04-08 01:08:54 +02:00
Maciej W. Rozycki
5d77cf2895 MIPS: math-emu: Reindent `bc_op' emulation
Correct the double-tab indentation of the branch-likely not-taken case.

Signed-off-by: Maciej W. Rozycki <macro@linux-mips.org>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/9674/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2015-04-08 01:08:52 +02:00
Maciej W. Rozycki
f6c70ff4de MIPS: Clarify the comment for `__cpu_has_fpu'
Reword the comment for `__cpu_has_fpu' to make it unambiguous this code
is for external floating-point units only, generally MIPS I processors
using the original CP1 hardware interface.

Signed-off-by: Maciej W. Rozycki <macro@linux-mips.org>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/9673/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2015-04-08 01:08:49 +02:00
Maciej W. Rozycki
1f44377900 MIPS: Correct the comment for FPU emulator traps
Adjust the explanatory comment for FPU emulator traps according to
ba3049ed [MIPS: Switch FPU emulator trap to BREAK instruction.];
originally coming from `do_ade'.

Signed-off-by: Maciej W. Rozycki <macro@linux-mips.org>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/9672/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2015-04-08 01:08:47 +02:00
Maciej W. Rozycki
1796ec7742 MIPS: ieee754.h: Supplement comments for special values
Add the remaining missing comments for IEEE 754 special value array
indices.  Reindent macro definitions for consistency.

Signed-off-by: Maciej W. Rozycki <macro@linux-mips.org>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/9671/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2015-04-08 01:08:44 +02:00
Maciej W. Rozycki
b3fea96269 MIPS: ieee754.h: Correct comments for special values
IEEE754_SPCVAL_NMIN denotes the index into the special value array where
the closest to zero negative normal number expressible is stored.
Similarly IEEE754_SPCVAL_NMIND denotes such index for the closest to
zero negative subnormal number expressible.  Make comments match that.

Signed-off-by: Maciej W. Rozycki <macro@linux-mips.org>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/9670/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2015-04-08 01:08:41 +02:00
Maciej W. Rozycki
1054533a32 MIPS: mipsregs.h: Reindent CP0 Cause macros
Reindent CP0 Cause macros for a single space after #define, leaving
extra indentation for individual Interrupt Pending bits as with CP0
Status register's Interrupt Mask bits.

[ralf@linux-mips.org: Fix conflict.]
[ralf@linux-mips.org: Fix indentation of the CAUSEB_FDCI and CAUSEF_FDCI
definitions.]

Signed-off-by: Maciej W. Rozycki <macro@linux-mips.org>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/9669/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2015-04-08 01:08:39 +02:00
Maciej W. Rozycki
e08384cad8 MIPS: mipsregs.h: Move TX39 macros out of the way
TX39 CP0 Configuration Register 3 macro definitions have been randomly
thrown in the middle of a block of CP0 Status register value macros.
Move them to the end of the whole CP0 register value macro block,
complementing the location of the TX39 Cache register name macro at the
end of the CP0 register name macro block.

[ralf@linux-mips.org: Fix conflict.]

Signed-off-by: Maciej W. Rozycki <macro@linux-mips.org>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/9668/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2015-04-08 01:08:36 +02:00
Maciej W. Rozycki
fda51906ea MIPS: mipsregs.h: Reorder CP1 macro definitions
Originally CP1 macros were placed between CP0 register name macros and
CP0 register value macros.  As changes were applied to the header the
position of CP1 macros gradually has become more and more arbitrary and
two separate blocks were created.  This may only cause confusion.

Move them out of the way then and place together after all the CP0
macros.  No semantic change.

[ralf@linux-mips.org: Fix conflict.]

Signed-off-by: Maciej W. Rozycki <macro@linux-mips.org>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/9667/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2015-04-08 01:08:34 +02:00
Maciej W. Rozycki
124f43d30f MIPS: mipsregs.h: Remove broken comments
Remove a duplicate FPU Status Register reference that has been there
since forever and a mistakenly copied and pasted R4xx0 manual reference.

[ralf@linux-mips.org: Fix conflict.]

Signed-off-by: Maciej W. Rozycki <macro@linux-mips.org>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/9666/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2015-04-08 01:08:30 +02:00
Maciej W. Rozycki
fab43ef4c8 DOC: kernel-parameters.txt: Mark `nofpu' for MIPS too
The MIPS port has supported this option since forever, long before SH
was even in plans.

Signed-off-by: Maciej W. Rozycki <macro@linux-mips.org>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/9665/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2015-04-08 01:08:28 +02:00
Haiyang Zhang
ee90b81203 hv_netvsc: Fix the packet free when it is in skb headroom
In the two places changed, we now use netvsc_xmit_completion() which properly
frees hv_netvsc_packet in or not in skb headroom.

Signed-off-by: Haiyang Zhang <haiyangz@microsoft.com>
Reviewed-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2015-04-07 18:45:33 -04:00
Haiyang Zhang
721514222d hv_netvsc: Define a macro RNDIS_AND_PPI_SIZE
The sum of RNDIS msg and PPI struct sizes is used in multiple places, so we define
a macro for them.

Signed-off-by: Haiyang Zhang <haiyangz@microsoft.com>
Reviewed-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2015-04-07 18:45:33 -04:00
Haiyang Zhang
0d158852a8 hv_netvsc: Clean up two unused variables
Signed-off-by: Haiyang Zhang <haiyangz@microsoft.com>
Reviewed-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2015-04-07 18:45:32 -04:00
Daniel Lee
2646c831c0 tcp: RFC7413 option support for Fast Open client
Fast Open has been using an experimental option with a magic number
(RFC6994). This patch makes the client by default use the RFC7413
option (34) to get and send Fast Open cookies.  This patch makes
the client solicit cookies from a given server first with the
RFC7413 option. If that fails to elicit a cookie, then it tries
the RFC6994 experimental option. If that also fails, it uses the
RFC7413 option on all subsequent connect attempts.  If the server
returns a Fast Open cookie then the client caches the form of the
option that successfully elicited a cookie, and uses that form on
later connects when it presents that cookie.

The idea is to gradually obsolete the use of experimental options as
the servers and clients upgrade, while keeping the interoperability
meanwhile.

Signed-off-by: Daniel Lee <Longinus00@gmail.com>
Signed-off-by: Yuchung Cheng <ycheng@google.com>
Signed-off-by: Neal Cardwell <ncardwell@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2015-04-07 18:36:39 -04:00
Daniel Lee
7f9b838b71 tcp: RFC7413 option support for Fast Open server
Fast Open has been using the experimental option with a magic number
(RFC6994) to request and grant Fast Open cookies. This patch enables
the server to support the official IANA option 34 in RFC7413 in
addition.

The change has passed all existing Fast Open tests with both
old and new options at Google.

Signed-off-by: Daniel Lee <Longinus00@gmail.com>
Signed-off-by: Yuchung Cheng <ycheng@google.com>
Signed-off-by: Neal Cardwell <ncardwell@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2015-04-07 18:36:39 -04:00
Beshay, Joseph
0ad2a83659 netem: Fixes byte backlog accounting for the first of two chained netem instances
Fixes byte backlog accounting for the first of two chained netem instances.
Bytes backlog reported now corresponds to the number of queued packets.

When two netem instances are chained, for instance to apply rate and queue
limitation followed by packet delay, the number of backlogged bytes reported
by the first netem instance is wrong. It reports the sum of bytes in the queues
of the first and second netem. The first netem reports the correct number of
backlogged packets but not bytes. This is shown in the example below.

Consider a chain of two netem schedulers created using the following commands:

$ tc -s qdisc replace dev veth2 root handle 1:0 netem rate 10000kbit limit 100
$ tc -s qdisc add dev veth2 parent 1:0 handle 2: netem delay 50ms

Start an iperf session to send packets out on the specified interface and
monitor the backlog using tc:

$ tc -s qdisc show dev veth2

Output using unpatched netem:
	qdisc netem 1: root refcnt 2 limit 100 rate 10000Kbit
	 Sent 98422639 bytes 65434 pkt (dropped 123, overlimits 0 requeues 0)
	 backlog 172694b 73p requeues 0
	qdisc netem 2: parent 1: limit 1000 delay 50.0ms
	 Sent 98422639 bytes 65434 pkt (dropped 0, overlimits 0 requeues 0)
	 backlog 63588b 42p requeues 0

The interface used to produce this output has an MTU of 1500. The output for
backlogged bytes behind netem 1 is 172694b. This value is not correct. Consider
the total number of sent bytes and packets. By dividing the number of sent
bytes by the number of sent packets, we get an average packet size of ~=1504.
If we divide the number of backlogged bytes by packets, we get ~=2365. This is
due to the first netem incorrectly counting the 63588b which are in netem 2's
queue as being in its own queue. To verify this is the case, we subtract them
from the reported value and divide by the number of packets as follows:
	172694 - 63588 = 109106 bytes actualled backlogged in netem 1
	109106 / 73 packets ~= 1494 bytes (which matches our MTU)

The root cause is that the byte accounting is not done at the
same time with packet accounting. The solution is to update the backlog value
every time the packet queue is updated.

Signed-off-by: Joseph D Beshay <joseph.beshay@utdallas.edu>
Acked-by: Hagen Paul Pfeifer <hagen@jauu.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
2015-04-07 18:34:24 -04:00
Hariprasad Shenai
812034f116 cxgb4: Move ethtool related code to a separate file
Signed-off-by: Hariprasad Shenai <hariprasad@chelsio.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2015-04-07 17:38:54 -04:00
Johan Hedberg
40f66c05c3 Bluetooth: Add local SSP OOB data to OOB ext data mgmt command
The Read Local Out Of Band Extended Data mgmt command is specified to
return the SSP values when given a BR/EDR address type as input
parameter. The returned values may include either the 192-bit variants
of C and R, or their 256-bit variants, or both, depending on the status
of Secure Connections and Secure Connections Only modes. If SSP is not
enabled the command will only return the Class of Device value (like it
has done so far).

Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
2015-04-07 23:31:20 +02:00
Nicolas Dichtel
388069d302 netdevice.h: remove iflink description
Also move 'group' description to match the order of the net_device structure.

Fixes: 7a66bbc96c ("net: remove iflink field from struct net_device")
Reported-by: Fengguang Wu <fengguang.wu@intel.com>
Signed-off-by: Nicolas Dichtel <nicolas.dichtel@6wind.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2015-04-07 17:30:45 -04:00
David S. Miller
26ba9e8c3f Merge branch 'netns-next'
Nicolas Dichtel says:

====================
netns: enhance netlink interface for nsid

The first patch is a small cleanup. The second patch implements notifications
for netns id events. And the last one allows to dump existing netns id from
userland.

iproute2 patches are available, I can send them on demand.

v2: drop the first patch (the fix is now in net-next)
====================

Signed-off-by: David S. Miller <davem@davemloft.net>
2015-04-07 17:29:47 -04:00
Nicolas Dichtel
a143c40c32 netns: allow to dump netns ids
Which this patch, it's possible to dump the list of ids allocated for peer
netns.

Signed-off-by: Nicolas Dichtel <nicolas.dichtel@6wind.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2015-04-07 17:29:41 -04:00