crypto: sha256-mb - submit/flush routines for AVX2

This patch introduces the routines used to submit and flush buffers
belonging to SHA256 crypto jobs to the SHA256 multibuffer algorithm. It
is implemented mostly in assembly optimized with AVX2 instructions.

Signed-off-by: Megha Dey <megha.dey@linux.intel.com>
Reviewed-by: Fenghua Yu <fenghua.yu@intel.com>
Reviewed-by: Tim Chen <tim.c.chen@linux.intel.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

3 files changed, 584 insertions, 0 deletions

diff --git a/arch/x86/crypto/sha256-mb/sha256_mb_mgr_flush_avx2.S b/arch/x86/crypto/sha256-mb/sha256_mb_mgr_flush_avx2.S
new file mode 100644
index 000000000000..b691da981cd9
--- /dev/null
+++ b/arch/x86/crypto/sha256-mb/sha256_mb_mgr_flush_avx2.S
@@ -0,0 +1,304 @@
+/*
+ * Flush routine for SHA256 multibuffer
+ *
+ * This file is provided under a dual BSD/GPLv2 license.  When using or
+ * redistributing this file, you may do so under either license.
+ *
+ * GPL LICENSE SUMMARY
+ *
+ *  Copyright(c) 2016 Intel Corporation.
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of version 2 of the GNU General Public License as
+ *  published by the Free Software Foundation.
+ *
+ *  This program is distributed in the hope that it will be useful, but
+ *  WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ *  General Public License for more details.
+ *
+ *  Contact Information:
+ *      Megha Dey <megha.dey@linux.intel.com>
+ *
+ *  BSD LICENSE
+ *
+ *  Copyright(c) 2016 Intel Corporation.
+ *
+ *  Redistribution and use in source and binary forms, with or without
+ *  modification, are permitted provided that the following conditions
+ *  are met:
+ *
+ *    * Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *    * Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in
+ *      the documentation and/or other materials provided with the
+ *      distribution.
+ *    * Neither the name of Intel Corporation nor the names of its
+ *      contributors may be used to endorse or promote products derived
+ *      from this software without specific prior written permission.
+ *
+ *  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ *  "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ *  LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ *  A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ *  OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ *  SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ *  LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ *  DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ *  THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ *  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+#include <linux/linkage.h>
+#include <asm/frame.h>
+#include "sha256_mb_mgr_datastruct.S"
+
+.extern sha256_x8_avx2
+
+#LINUX register definitions
+#define arg1    %rdi
+#define arg2    %rsi
+
+# Common register definitions
+#define state   arg1
+#define job     arg2
+#define len2    arg2
+
+# idx must be a register not clobberred by sha1_mult
+#define idx             %r8
+#define DWORD_idx       %r8d
+
+#define unused_lanes    %rbx
+#define lane_data       %rbx
+#define tmp2            %rbx
+#define tmp2_w          %ebx
+
+#define job_rax         %rax
+#define tmp1            %rax
+#define size_offset     %rax
+#define tmp             %rax
+#define start_offset    %rax
+
+#define tmp3            %arg1
+
+#define extra_blocks    %arg2
+#define p               %arg2
+
+.macro LABEL prefix n
+\prefix\n\():
+.endm
+
+.macro JNE_SKIP i
+jne     skip_\i
+.endm
+
+.altmacro
+.macro SET_OFFSET _offset
+offset = \_offset
+.endm
+.noaltmacro
+
+# JOB_SHA256* sha256_mb_mgr_flush_avx2(MB_MGR *state)
+# arg 1 : rcx : state
+ENTRY(sha256_mb_mgr_flush_avx2)
+        FRAME_BEGIN
+        push    %rbx
+
+        # If bit (32+3) is set, then all lanes are empty
+        mov     _unused_lanes(state), unused_lanes
+        bt      $32+3, unused_lanes
+        jc      return_null
+
+        # find a lane with a non-null job
+        xor     idx, idx
+        offset = (_ldata + 1 * _LANE_DATA_size + _job_in_lane)
+        cmpq    $0, offset(state)
+        cmovne  one(%rip), idx
+        offset = (_ldata + 2 * _LANE_DATA_size + _job_in_lane)
+        cmpq    $0, offset(state)
+        cmovne  two(%rip), idx
+        offset = (_ldata + 3 * _LANE_DATA_size + _job_in_lane)
+        cmpq    $0, offset(state)
+        cmovne  three(%rip), idx
+        offset = (_ldata + 4 * _LANE_DATA_size + _job_in_lane)
+        cmpq    $0, offset(state)
+        cmovne  four(%rip), idx
+        offset = (_ldata + 5 * _LANE_DATA_size + _job_in_lane)
+        cmpq    $0, offset(state)
+        cmovne  five(%rip), idx
+        offset = (_ldata + 6 * _LANE_DATA_size + _job_in_lane)
+        cmpq    $0, offset(state)
+        cmovne  six(%rip), idx
+        offset = (_ldata + 7 * _LANE_DATA_size + _job_in_lane)
+        cmpq    $0, offset(state)
+        cmovne  seven(%rip), idx
+
+        # copy idx to empty lanes
+copy_lane_data:
+        offset =  (_args + _data_ptr)
+        mov     offset(state,idx,8), tmp
+
+        I = 0
+.rep 8
+        offset = (_ldata + I * _LANE_DATA_size + _job_in_lane)
+        cmpq    $0, offset(state)
+.altmacro
+        JNE_SKIP %I
+        offset =  (_args + _data_ptr + 8*I)
+        mov     tmp, offset(state)
+        offset =  (_lens + 4*I)
+        movl    $0xFFFFFFFF, offset(state)
+LABEL skip_ %I
+        I = (I+1)
+.noaltmacro
+.endr
+
+        # Find min length
+        vmovdqa _lens+0*16(state), %xmm0
+        vmovdqa _lens+1*16(state), %xmm1
+
+        vpminud %xmm1, %xmm0, %xmm2             # xmm2 has {D,C,B,A}
+        vpalignr $8, %xmm2, %xmm3, %xmm3        # xmm3 has {x,x,D,C}
+        vpminud %xmm3, %xmm2, %xmm2             # xmm2 has {x,x,E,F}
+        vpalignr $4, %xmm2, %xmm3, %xmm3        # xmm3 has {x,x,x,E}
+        vpminud %xmm3, %xmm2, %xmm2             # xmm2 has min val in low dword
+
+        vmovd   %xmm2, DWORD_idx
+        mov     idx, len2
+        and     $0xF, idx
+        shr     $4, len2
+        jz      len_is_0
+
+        vpand   clear_low_nibble(%rip), %xmm2, %xmm2
+        vpshufd $0, %xmm2, %xmm2
+
+        vpsubd  %xmm2, %xmm0, %xmm0
+        vpsubd  %xmm2, %xmm1, %xmm1
+
+        vmovdqa %xmm0, _lens+0*16(state)
+        vmovdqa %xmm1, _lens+1*16(state)
+
+        # "state" and "args" are the same address, arg1
+        # len is arg2
+        call    sha256_x8_avx2
+        # state and idx are intact
+
+len_is_0:
+        # process completed job "idx"
+        imul    $_LANE_DATA_size, idx, lane_data
+        lea     _ldata(state, lane_data), lane_data
+
+        mov     _job_in_lane(lane_data), job_rax
+        movq    $0, _job_in_lane(lane_data)
+        movl    $STS_COMPLETED, _status(job_rax)
+        mov     _unused_lanes(state), unused_lanes
+        shl     $4, unused_lanes
+        or      idx, unused_lanes
+
+        mov     unused_lanes, _unused_lanes(state)
+        movl    $0xFFFFFFFF, _lens(state,idx,4)
+
+        vmovd   _args_digest(state , idx, 4) , %xmm0
+        vpinsrd $1, _args_digest+1*32(state, idx, 4), %xmm0, %xmm0
+        vpinsrd $2, _args_digest+2*32(state, idx, 4), %xmm0, %xmm0
+        vpinsrd $3, _args_digest+3*32(state, idx, 4), %xmm0, %xmm0
+        vmovd   _args_digest+4*32(state, idx, 4), %xmm1
+        vpinsrd $1, _args_digest+5*32(state, idx, 4), %xmm1, %xmm1
+        vpinsrd $2, _args_digest+6*32(state, idx, 4), %xmm1, %xmm1
+        vpinsrd $3, _args_digest+7*32(state, idx, 4), %xmm1, %xmm1
+
+        vmovdqu %xmm0, _result_digest(job_rax)
+        offset =  (_result_digest + 1*16)
+        vmovdqu %xmm1, offset(job_rax)
+
+return:
+        pop     %rbx
+        FRAME_END
+        ret
+
+return_null:
+        xor     job_rax, job_rax
+        jmp     return
+ENDPROC(sha256_mb_mgr_flush_avx2)
+
+##############################################################################
+
+.align 16
+ENTRY(sha256_mb_mgr_get_comp_job_avx2)
+        push    %rbx
+
+        ## if bit 32+3 is set, then all lanes are empty
+        mov     _unused_lanes(state), unused_lanes
+        bt      $(32+3), unused_lanes
+        jc      .return_null
+
+        # Find min length
+        vmovdqa _lens(state), %xmm0
+        vmovdqa _lens+1*16(state), %xmm1
+
+        vpminud %xmm1, %xmm0, %xmm2             # xmm2 has {D,C,B,A}
+        vpalignr $8, %xmm2, %xmm3, %xmm3        # xmm3 has {x,x,D,C}
+        vpminud %xmm3, %xmm2, %xmm2             # xmm2 has {x,x,E,F}
+        vpalignr $4, %xmm2, %xmm3, %xmm3        # xmm3 has {x,x,x,E}
+        vpminud %xmm3, %xmm2, %xmm2             # xmm2 has min val in low dword
+
+        vmovd   %xmm2, DWORD_idx
+        test    $~0xF, idx
+        jnz     .return_null
+
+        # process completed job "idx"
+        imul    $_LANE_DATA_size, idx, lane_data
+        lea     _ldata(state, lane_data), lane_data
+
+        mov     _job_in_lane(lane_data), job_rax
+        movq    $0,  _job_in_lane(lane_data)
+        movl    $STS_COMPLETED, _status(job_rax)
+        mov     _unused_lanes(state), unused_lanes
+        shl     $4, unused_lanes
+        or      idx, unused_lanes
+        mov     unused_lanes, _unused_lanes(state)
+
+        movl    $0xFFFFFFFF, _lens(state,  idx, 4)
+
+        vmovd   _args_digest(state, idx, 4), %xmm0
+        vpinsrd $1, _args_digest+1*32(state, idx, 4), %xmm0, %xmm0
+        vpinsrd $2, _args_digest+2*32(state, idx, 4), %xmm0, %xmm0
+        vpinsrd $3, _args_digest+3*32(state, idx, 4), %xmm0, %xmm0
+        movl    _args_digest+4*32(state, idx, 4), tmp2_w
+        vpinsrd $1, _args_digest+5*32(state, idx, 4), %xmm1, %xmm1
+        vpinsrd $2, _args_digest+6*32(state, idx, 4), %xmm1, %xmm1
+        vpinsrd $3, _args_digest+7*32(state, idx, 4), %xmm1, %xmm1
+
+        vmovdqu %xmm0, _result_digest(job_rax)
+        movl    tmp2_w, _result_digest+1*16(job_rax)
+
+        pop     %rbx
+
+        ret
+
+.return_null:
+        xor     job_rax, job_rax
+        pop     %rbx
+        ret
+ENDPROC(sha256_mb_mgr_get_comp_job_avx2)
+
+.data
+
+.align 16
+clear_low_nibble:
+.octa   0x000000000000000000000000FFFFFFF0
+one:
+.quad   1
+two:
+.quad   2
+three:
+.quad   3
+four:
+.quad   4
+five:
+.quad   5
+six:
+.quad   6
+seven:
+.quad  7
diff --git a/arch/x86/crypto/sha256-mb/sha256_mb_mgr_init_avx2.c b/arch/x86/crypto/sha256-mb/sha256_mb_mgr_init_avx2.c
new file mode 100644
index 000000000000..b0c498371e67
--- /dev/null
+++ b/arch/x86/crypto/sha256-mb/sha256_mb_mgr_init_avx2.c
@@ -0,0 +1,65 @@
+/*
+ * Initialization code for multi buffer SHA256 algorithm for AVX2
+ *
+ * This file is provided under a dual BSD/GPLv2 license.  When using or
+ * redistributing this file, you may do so under either license.
+ *
+ * GPL LICENSE SUMMARY
+ *
+ *  Copyright(c) 2016 Intel Corporation.
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of version 2 of the GNU General Public License as
+ *  published by the Free Software Foundation.
+ *
+ *  This program is distributed in the hope that it will be useful, but
+ *  WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ *  General Public License for more details.
+ *
+ *  Contact Information:
+ *      Megha Dey <megha.dey@linux.intel.com>
+ *
+ *  BSD LICENSE
+ *
+ *  Copyright(c) 2016 Intel Corporation.
+ *
+ *  Redistribution and use in source and binary forms, with or without
+ *  modification, are permitted provided that the following conditions
+ *  are met:
+ *
+ *    * Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *    * Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in
+ *      the documentation and/or other materials provided with the
+ *      distribution.
+ *    * Neither the name of Intel Corporation nor the names of its
+ *      contributors may be used to endorse or promote products derived
+ *      from this software without specific prior written permission.
+ *
+ *  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ *  "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ *  LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ *  A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ *  OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ *  SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ *  LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ *  DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ *  THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ *  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "sha256_mb_mgr.h"
+
+void sha256_mb_mgr_init_avx2(struct sha256_mb_mgr *state)
+{
+        unsigned int j;
+
+        state->unused_lanes = 0xF76543210ULL;
+        for (j = 0; j < 8; j++) {
+                state->lens[j] = 0xFFFFFFFF;
+                state->ldata[j].job_in_lane = NULL;
+        }
+}
diff --git a/arch/x86/crypto/sha256-mb/sha256_mb_mgr_submit_avx2.S b/arch/x86/crypto/sha256-mb/sha256_mb_mgr_submit_avx2.S
new file mode 100644
index 000000000000..7ea670e25acc
--- /dev/null
+++ b/arch/x86/crypto/sha256-mb/sha256_mb_mgr_submit_avx2.S
@@ -0,0 +1,215 @@
+/*
+ * Buffer submit code for multi buffer SHA256 algorithm
+ *
+ * This file is provided under a dual BSD/GPLv2 license.  When using or
+ * redistributing this file, you may do so under either license.
+ *
+ * GPL LICENSE SUMMARY
+ *
+ *  Copyright(c) 2016 Intel Corporation.
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of version 2 of the GNU General Public License as
+ *  published by the Free Software Foundation.
+ *
+ *  This program is distributed in the hope that it will be useful, but
+ *  WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ *  General Public License for more details.
+ *
+ *  Contact Information:
+ *      Megha Dey <megha.dey@linux.intel.com>
+ *
+ *  BSD LICENSE
+ *
+ *  Copyright(c) 2016 Intel Corporation.
+ *
+ *  Redistribution and use in source and binary forms, with or without
+ *  modification, are permitted provided that the following conditions
+ *  are met:
+ *
+ *    * Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *    * Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in
+ *      the documentation and/or other materials provided with the
+ *      distribution.
+ *    * Neither the name of Intel Corporation nor the names of its
+ *      contributors may be used to endorse or promote products derived
+ *      from this software without specific prior written permission.
+ *
+ *  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ *  "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ *  LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ *  A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ *  OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ *  SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ *  LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ *  DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ *  THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ *  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <linux/linkage.h>
+#include <asm/frame.h>
+#include "sha256_mb_mgr_datastruct.S"
+
+.extern sha256_x8_avx2
+
+# LINUX register definitions
+arg1            = %rdi
+arg2            = %rsi
+size_offset     = %rcx
+tmp2            = %rcx
+extra_blocks    = %rdx
+
+# Common definitions
+#define state   arg1
+#define job     %rsi
+#define len2    arg2
+#define p2      arg2
+
+# idx must be a register not clobberred by sha1_x8_avx2
+idx             = %r8
+DWORD_idx       = %r8d
+last_len        = %r8
+
+p               = %r11
+start_offset    = %r11
+
+unused_lanes    = %rbx
+BYTE_unused_lanes = %bl
+
+job_rax         = %rax
+len             = %rax
+DWORD_len       = %eax
+
+lane            = %r12
+tmp3            = %r12
+
+tmp             = %r9
+DWORD_tmp       = %r9d
+
+lane_data       = %r10
+
+# JOB* sha256_mb_mgr_submit_avx2(MB_MGR *state, JOB_SHA256 *job)
+# arg 1 : rcx : state
+# arg 2 : rdx : job
+ENTRY(sha256_mb_mgr_submit_avx2)
+        FRAME_BEGIN
+        push    %rbx
+        push    %r12
+
+        mov     _unused_lanes(state), unused_lanes
+        mov     unused_lanes, lane
+        and     $0xF, lane
+        shr     $4, unused_lanes
+        imul    $_LANE_DATA_size, lane, lane_data
+        movl    $STS_BEING_PROCESSED, _status(job)
+        lea     _ldata(state, lane_data), lane_data
+        mov     unused_lanes, _unused_lanes(state)
+        movl    _len(job),  DWORD_len
+
+        mov     job, _job_in_lane(lane_data)
+        shl     $4, len
+        or      lane, len
+
+        movl    DWORD_len,  _lens(state , lane, 4)
+
+        # Load digest words from result_digest
+        vmovdqu _result_digest(job), %xmm0
+        vmovdqu _result_digest+1*16(job), %xmm1
+        vmovd   %xmm0, _args_digest(state, lane, 4)
+        vpextrd $1, %xmm0, _args_digest+1*32(state , lane, 4)
+        vpextrd $2, %xmm0, _args_digest+2*32(state , lane, 4)
+        vpextrd $3, %xmm0, _args_digest+3*32(state , lane, 4)
+        vmovd   %xmm1, _args_digest+4*32(state , lane, 4)
+
+        vpextrd $1, %xmm1, _args_digest+5*32(state , lane, 4)
+        vpextrd $2, %xmm1, _args_digest+6*32(state , lane, 4)
+        vpextrd $3, %xmm1, _args_digest+7*32(state , lane, 4)
+
+        mov     _buffer(job), p
+        mov     p, _args_data_ptr(state, lane, 8)
+
+        cmp     $0xF, unused_lanes
+        jne     return_null
+
+start_loop:
+        # Find min length
+        vmovdqa _lens(state), %xmm0
+        vmovdqa _lens+1*16(state), %xmm1
+
+        vpminud %xmm1, %xmm0, %xmm2             # xmm2 has {D,C,B,A}
+        vpalignr $8, %xmm2, %xmm3, %xmm3        # xmm3 has {x,x,D,C}
+        vpminud %xmm3, %xmm2, %xmm2             # xmm2 has {x,x,E,F}
+        vpalignr $4, %xmm2, %xmm3, %xmm3        # xmm3 has {x,x,x,E}
+        vpminud %xmm3, %xmm2, %xmm2             # xmm2 has min val in low dword
+
+        vmovd   %xmm2, DWORD_idx
+        mov     idx, len2
+        and     $0xF, idx
+        shr     $4, len2
+        jz      len_is_0
+
+        vpand   clear_low_nibble(%rip), %xmm2, %xmm2
+        vpshufd $0, %xmm2, %xmm2
+
+        vpsubd  %xmm2, %xmm0, %xmm0
+        vpsubd  %xmm2, %xmm1, %xmm1
+
+        vmovdqa %xmm0, _lens + 0*16(state)
+        vmovdqa %xmm1, _lens + 1*16(state)
+
+        # "state" and "args" are the same address, arg1
+        # len is arg2
+        call    sha256_x8_avx2
+
+        # state and idx are intact
+
+len_is_0:
+        # process completed job "idx"
+        imul    $_LANE_DATA_size, idx, lane_data
+        lea     _ldata(state, lane_data), lane_data
+
+        mov     _job_in_lane(lane_data), job_rax
+        mov     _unused_lanes(state), unused_lanes
+        movq    $0, _job_in_lane(lane_data)
+        movl    $STS_COMPLETED, _status(job_rax)
+        shl     $4, unused_lanes
+        or      idx, unused_lanes
+        mov     unused_lanes, _unused_lanes(state)
+
+        movl    $0xFFFFFFFF, _lens(state,idx,4)
+
+        vmovd   _args_digest(state, idx, 4), %xmm0
+        vpinsrd $1, _args_digest+1*32(state , idx, 4), %xmm0, %xmm0
+        vpinsrd $2, _args_digest+2*32(state , idx, 4), %xmm0, %xmm0
+        vpinsrd $3, _args_digest+3*32(state , idx, 4), %xmm0, %xmm0
+        vmovd   _args_digest+4*32(state, idx, 4), %xmm1
+
+        vpinsrd $1, _args_digest+5*32(state , idx, 4), %xmm1, %xmm1
+        vpinsrd $2, _args_digest+6*32(state , idx, 4), %xmm1, %xmm1
+        vpinsrd $3, _args_digest+7*32(state , idx, 4), %xmm1, %xmm1
+
+        vmovdqu %xmm0, _result_digest(job_rax)
+        vmovdqu %xmm1, _result_digest+1*16(job_rax)
+
+return:
+        pop     %r12
+        pop     %rbx
+        FRAME_END
+        ret
+
+return_null:
+        xor     job_rax, job_rax
+        jmp     return
+
+ENDPROC(sha256_mb_mgr_submit_avx2)
+
+.data
+
+.align 16
+clear_low_nibble:
+        .octa   0x000000000000000000000000FFFFFFF0