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linux-stable/drivers/net/ethernet/netronome/nfp/bpf/jit.c
Jakub Kicinski 9f16c8abcd nfp: bpf: optimize mov64 a little 
Loading 64bit constants require up to 4 load immediates, since
we can only load 16 bits at a time.  If the 32bit halves of
the 64bit constant are the same, however, we can save a cycle
by doing a register move instead of two loads of 16 bits.

Note that we don't optimize the normal ALU64 load because even
though it's a 64 bit load the upper half of the register is
a coming from sign extension so we can load it in one cycle
anyway.

Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Reviewed-by: Quentin Monnet <quentin.monnet@netronome.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2017-10-24 17:38:37 +09:00

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/*
* Copyright (C) 2016 Netronome Systems, Inc.
*
* This software is dual licensed under the GNU General License Version 2,
* June 1991 as shown in the file COPYING in the top-level directory of this
* source tree or the BSD 2-Clause License provided below. You have the
* option to license this software under the complete terms of either license.
*
* The BSD 2-Clause License:
*
* Redistribution and use in source and binary forms, with or
* without modification, are permitted provided that the following
* conditions are met:
*
* 1. Redistributions of source code must retain the above
* copyright notice, this list of conditions and the following
* disclaimer.
*
* 2. 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.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#define pr_fmt(fmt) "NFP net bpf: " fmt
#include <linux/kernel.h>
#include <linux/bpf.h>
#include <linux/filter.h>
#include <linux/pkt_cls.h>
#include <linux/unistd.h>
#include "main.h"
#include "../nfp_asm.h"
/* --- NFP prog --- */
/* Foreach "multiple" entries macros provide pos and next<n> pointers.
* It's safe to modify the next pointers (but not pos).
*/
#define nfp_for_each_insn_walk2(nfp_prog, pos, next) \
for (pos = list_first_entry(&(nfp_prog)->insns, typeof(*pos), l), \
next = list_next_entry(pos, l); \
&(nfp_prog)->insns != &pos->l && \
&(nfp_prog)->insns != &next->l; \
pos = nfp_meta_next(pos), \
next = nfp_meta_next(pos))
#define nfp_for_each_insn_walk3(nfp_prog, pos, next, next2) \
for (pos = list_first_entry(&(nfp_prog)->insns, typeof(*pos), l), \
next = list_next_entry(pos, l), \
next2 = list_next_entry(next, l); \
&(nfp_prog)->insns != &pos->l && \
&(nfp_prog)->insns != &next->l && \
&(nfp_prog)->insns != &next2->l; \
pos = nfp_meta_next(pos), \
next = nfp_meta_next(pos), \
next2 = nfp_meta_next(next))
static bool
nfp_meta_has_next(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
{
return meta->l.next != &nfp_prog->insns;
}
static bool
nfp_meta_has_prev(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
{
return meta->l.prev != &nfp_prog->insns;
}
static void nfp_prog_free(struct nfp_prog *nfp_prog)
{
struct nfp_insn_meta *meta, *tmp;
list_for_each_entry_safe(meta, tmp, &nfp_prog->insns, l) {
list_del(&meta->l);
kfree(meta);
}
kfree(nfp_prog);
}
static void nfp_prog_push(struct nfp_prog *nfp_prog, u64 insn)
{
if (nfp_prog->__prog_alloc_len == nfp_prog->prog_len) {
nfp_prog->error = -ENOSPC;
return;
}
nfp_prog->prog[nfp_prog->prog_len] = insn;
nfp_prog->prog_len++;
}
static unsigned int nfp_prog_current_offset(struct nfp_prog *nfp_prog)
{
return nfp_prog->start_off + nfp_prog->prog_len;
}
static unsigned int
nfp_prog_offset_to_index(struct nfp_prog *nfp_prog, unsigned int offset)
{
return offset - nfp_prog->start_off;
}
/* --- Emitters --- */
static void
__emit_cmd(struct nfp_prog *nfp_prog, enum cmd_tgt_map op,
u8 mode, u8 xfer, u8 areg, u8 breg, u8 size, bool sync)
{
enum cmd_ctx_swap ctx;
u64 insn;
if (sync)
ctx = CMD_CTX_SWAP;
else
ctx = CMD_CTX_NO_SWAP;
insn = FIELD_PREP(OP_CMD_A_SRC, areg) |
FIELD_PREP(OP_CMD_CTX, ctx) |
FIELD_PREP(OP_CMD_B_SRC, breg) |
FIELD_PREP(OP_CMD_TOKEN, cmd_tgt_act[op].token) |
FIELD_PREP(OP_CMD_XFER, xfer) |
FIELD_PREP(OP_CMD_CNT, size) |
FIELD_PREP(OP_CMD_SIG, sync) |
FIELD_PREP(OP_CMD_TGT_CMD, cmd_tgt_act[op].tgt_cmd) |
FIELD_PREP(OP_CMD_MODE, mode);
nfp_prog_push(nfp_prog, insn);
}
static void
emit_cmd(struct nfp_prog *nfp_prog, enum cmd_tgt_map op,
u8 mode, u8 xfer, swreg lreg, swreg rreg, u8 size, bool sync)
{
struct nfp_insn_re_regs reg;
int err;
err = swreg_to_restricted(reg_none(), lreg, rreg, &reg, false);
if (err) {
nfp_prog->error = err;
return;
}
if (reg.swap) {
pr_err("cmd can't swap arguments\n");
nfp_prog->error = -EFAULT;
return;
}
if (reg.dst_lmextn || reg.src_lmextn) {
pr_err("cmd can't use LMextn\n");
nfp_prog->error = -EFAULT;
return;
}
__emit_cmd(nfp_prog, op, mode, xfer, reg.areg, reg.breg, size, sync);
}
static void
__emit_br(struct nfp_prog *nfp_prog, enum br_mask mask, enum br_ev_pip ev_pip,
enum br_ctx_signal_state css, u16 addr, u8 defer)
{
u16 addr_lo, addr_hi;
u64 insn;
addr_lo = addr & (OP_BR_ADDR_LO >> __bf_shf(OP_BR_ADDR_LO));
addr_hi = addr != addr_lo;
insn = OP_BR_BASE |
FIELD_PREP(OP_BR_MASK, mask) |
FIELD_PREP(OP_BR_EV_PIP, ev_pip) |
FIELD_PREP(OP_BR_CSS, css) |
FIELD_PREP(OP_BR_DEFBR, defer) |
FIELD_PREP(OP_BR_ADDR_LO, addr_lo) |
FIELD_PREP(OP_BR_ADDR_HI, addr_hi);
nfp_prog_push(nfp_prog, insn);
}
static void emit_br_def(struct nfp_prog *nfp_prog, u16 addr, u8 defer)
{
if (defer > 2) {
pr_err("BUG: branch defer out of bounds %d\n", defer);
nfp_prog->error = -EFAULT;
return;
}
__emit_br(nfp_prog, BR_UNC, BR_EV_PIP_UNCOND, BR_CSS_NONE, addr, defer);
}
static void
emit_br(struct nfp_prog *nfp_prog, enum br_mask mask, u16 addr, u8 defer)
{
__emit_br(nfp_prog, mask,
mask != BR_UNC ? BR_EV_PIP_COND : BR_EV_PIP_UNCOND,
BR_CSS_NONE, addr, defer);
}
static void
__emit_br_byte(struct nfp_prog *nfp_prog, u8 areg, u8 breg, bool imm8,
u8 byte, bool equal, u16 addr, u8 defer, bool src_lmextn)
{
u16 addr_lo, addr_hi;
u64 insn;
addr_lo = addr & (OP_BB_ADDR_LO >> __bf_shf(OP_BB_ADDR_LO));
addr_hi = addr != addr_lo;
insn = OP_BBYTE_BASE |
FIELD_PREP(OP_BB_A_SRC, areg) |
FIELD_PREP(OP_BB_BYTE, byte) |
FIELD_PREP(OP_BB_B_SRC, breg) |
FIELD_PREP(OP_BB_I8, imm8) |
FIELD_PREP(OP_BB_EQ, equal) |
FIELD_PREP(OP_BB_DEFBR, defer) |
FIELD_PREP(OP_BB_ADDR_LO, addr_lo) |
FIELD_PREP(OP_BB_ADDR_HI, addr_hi) |
FIELD_PREP(OP_BB_SRC_LMEXTN, src_lmextn);
nfp_prog_push(nfp_prog, insn);
}
static void
emit_br_byte_neq(struct nfp_prog *nfp_prog,
swreg src, u8 imm, u8 byte, u16 addr, u8 defer)
{
struct nfp_insn_re_regs reg;
int err;
err = swreg_to_restricted(reg_none(), src, reg_imm(imm), &reg, true);
if (err) {
nfp_prog->error = err;
return;
}
__emit_br_byte(nfp_prog, reg.areg, reg.breg, reg.i8, byte, false, addr,
defer, reg.src_lmextn);
}
static void
__emit_immed(struct nfp_prog *nfp_prog, u16 areg, u16 breg, u16 imm_hi,
enum immed_width width, bool invert,
enum immed_shift shift, bool wr_both,
bool dst_lmextn, bool src_lmextn)
{
u64 insn;
insn = OP_IMMED_BASE |
FIELD_PREP(OP_IMMED_A_SRC, areg) |
FIELD_PREP(OP_IMMED_B_SRC, breg) |
FIELD_PREP(OP_IMMED_IMM, imm_hi) |
FIELD_PREP(OP_IMMED_WIDTH, width) |
FIELD_PREP(OP_IMMED_INV, invert) |
FIELD_PREP(OP_IMMED_SHIFT, shift) |
FIELD_PREP(OP_IMMED_WR_AB, wr_both) |
FIELD_PREP(OP_IMMED_SRC_LMEXTN, src_lmextn) |
FIELD_PREP(OP_IMMED_DST_LMEXTN, dst_lmextn);
nfp_prog_push(nfp_prog, insn);
}
static void
emit_immed(struct nfp_prog *nfp_prog, swreg dst, u16 imm,
enum immed_width width, bool invert, enum immed_shift shift)
{
struct nfp_insn_ur_regs reg;
int err;
if (swreg_type(dst) == NN_REG_IMM) {
nfp_prog->error = -EFAULT;
return;
}
err = swreg_to_unrestricted(dst, dst, reg_imm(imm & 0xff), &reg);
if (err) {
nfp_prog->error = err;
return;
}
__emit_immed(nfp_prog, reg.areg, reg.breg, imm >> 8, width,
invert, shift, reg.wr_both,
reg.dst_lmextn, reg.src_lmextn);
}
static void
__emit_shf(struct nfp_prog *nfp_prog, u16 dst, enum alu_dst_ab dst_ab,
enum shf_sc sc, u8 shift,
u16 areg, enum shf_op op, u16 breg, bool i8, bool sw, bool wr_both,
bool dst_lmextn, bool src_lmextn)
{
u64 insn;
if (!FIELD_FIT(OP_SHF_SHIFT, shift)) {
nfp_prog->error = -EFAULT;
return;
}
if (sc == SHF_SC_L_SHF)
shift = 32 - shift;
insn = OP_SHF_BASE |
FIELD_PREP(OP_SHF_A_SRC, areg) |
FIELD_PREP(OP_SHF_SC, sc) |
FIELD_PREP(OP_SHF_B_SRC, breg) |
FIELD_PREP(OP_SHF_I8, i8) |
FIELD_PREP(OP_SHF_SW, sw) |
FIELD_PREP(OP_SHF_DST, dst) |
FIELD_PREP(OP_SHF_SHIFT, shift) |
FIELD_PREP(OP_SHF_OP, op) |
FIELD_PREP(OP_SHF_DST_AB, dst_ab) |
FIELD_PREP(OP_SHF_WR_AB, wr_both) |
FIELD_PREP(OP_SHF_SRC_LMEXTN, src_lmextn) |
FIELD_PREP(OP_SHF_DST_LMEXTN, dst_lmextn);
nfp_prog_push(nfp_prog, insn);
}
static void
emit_shf(struct nfp_prog *nfp_prog, swreg dst,
swreg lreg, enum shf_op op, swreg rreg, enum shf_sc sc, u8 shift)
{
struct nfp_insn_re_regs reg;
int err;
err = swreg_to_restricted(dst, lreg, rreg, &reg, true);
if (err) {
nfp_prog->error = err;
return;
}
__emit_shf(nfp_prog, reg.dst, reg.dst_ab, sc, shift,
reg.areg, op, reg.breg, reg.i8, reg.swap, reg.wr_both,
reg.dst_lmextn, reg.src_lmextn);
}
static void
__emit_alu(struct nfp_prog *nfp_prog, u16 dst, enum alu_dst_ab dst_ab,
u16 areg, enum alu_op op, u16 breg, bool swap, bool wr_both,
bool dst_lmextn, bool src_lmextn)
{
u64 insn;
insn = OP_ALU_BASE |
FIELD_PREP(OP_ALU_A_SRC, areg) |
FIELD_PREP(OP_ALU_B_SRC, breg) |
FIELD_PREP(OP_ALU_DST, dst) |
FIELD_PREP(OP_ALU_SW, swap) |
FIELD_PREP(OP_ALU_OP, op) |
FIELD_PREP(OP_ALU_DST_AB, dst_ab) |
FIELD_PREP(OP_ALU_WR_AB, wr_both) |
FIELD_PREP(OP_ALU_SRC_LMEXTN, src_lmextn) |
FIELD_PREP(OP_ALU_DST_LMEXTN, dst_lmextn);
nfp_prog_push(nfp_prog, insn);
}
static void
emit_alu(struct nfp_prog *nfp_prog, swreg dst,
swreg lreg, enum alu_op op, swreg rreg)
{
struct nfp_insn_ur_regs reg;
int err;
err = swreg_to_unrestricted(dst, lreg, rreg, &reg);
if (err) {
nfp_prog->error = err;
return;
}
__emit_alu(nfp_prog, reg.dst, reg.dst_ab,
reg.areg, op, reg.breg, reg.swap, reg.wr_both,
reg.dst_lmextn, reg.src_lmextn);
}
static void
__emit_ld_field(struct nfp_prog *nfp_prog, enum shf_sc sc,
u8 areg, u8 bmask, u8 breg, u8 shift, bool imm8,
bool zero, bool swap, bool wr_both,
bool dst_lmextn, bool src_lmextn)
{
u64 insn;
insn = OP_LDF_BASE |
FIELD_PREP(OP_LDF_A_SRC, areg) |
FIELD_PREP(OP_LDF_SC, sc) |
FIELD_PREP(OP_LDF_B_SRC, breg) |
FIELD_PREP(OP_LDF_I8, imm8) |
FIELD_PREP(OP_LDF_SW, swap) |
FIELD_PREP(OP_LDF_ZF, zero) |
FIELD_PREP(OP_LDF_BMASK, bmask) |
FIELD_PREP(OP_LDF_SHF, shift) |
FIELD_PREP(OP_LDF_WR_AB, wr_both) |
FIELD_PREP(OP_LDF_SRC_LMEXTN, src_lmextn) |
FIELD_PREP(OP_LDF_DST_LMEXTN, dst_lmextn);
nfp_prog_push(nfp_prog, insn);
}
static void
emit_ld_field_any(struct nfp_prog *nfp_prog, swreg dst, u8 bmask, swreg src,
enum shf_sc sc, u8 shift, bool zero)
{
struct nfp_insn_re_regs reg;
int err;
/* Note: ld_field is special as it uses one of the src regs as dst */
err = swreg_to_restricted(dst, dst, src, &reg, true);
if (err) {
nfp_prog->error = err;
return;
}
__emit_ld_field(nfp_prog, sc, reg.areg, bmask, reg.breg, shift,
reg.i8, zero, reg.swap, reg.wr_both,
reg.dst_lmextn, reg.src_lmextn);
}
static void
emit_ld_field(struct nfp_prog *nfp_prog, swreg dst, u8 bmask, swreg src,
enum shf_sc sc, u8 shift)
{
emit_ld_field_any(nfp_prog, dst, bmask, src, sc, shift, false);
}
static void
__emit_lcsr(struct nfp_prog *nfp_prog, u16 areg, u16 breg, bool wr, u16 addr,
bool dst_lmextn, bool src_lmextn)
{
u64 insn;
insn = OP_LCSR_BASE |
FIELD_PREP(OP_LCSR_A_SRC, areg) |
FIELD_PREP(OP_LCSR_B_SRC, breg) |
FIELD_PREP(OP_LCSR_WRITE, wr) |
FIELD_PREP(OP_LCSR_ADDR, addr) |
FIELD_PREP(OP_LCSR_SRC_LMEXTN, src_lmextn) |
FIELD_PREP(OP_LCSR_DST_LMEXTN, dst_lmextn);
nfp_prog_push(nfp_prog, insn);
}
static void emit_csr_wr(struct nfp_prog *nfp_prog, swreg src, u16 addr)
{
struct nfp_insn_ur_regs reg;
int err;
/* This instruction takes immeds instead of reg_none() for the ignored
* operand, but we can't encode 2 immeds in one instr with our normal
* swreg infra so if param is an immed, we encode as reg_none() and
* copy the immed to both operands.
*/
if (swreg_type(src) == NN_REG_IMM) {
err = swreg_to_unrestricted(reg_none(), src, reg_none(), &reg);
reg.breg = reg.areg;
} else {
err = swreg_to_unrestricted(reg_none(), src, reg_imm(0), &reg);
}
if (err) {
nfp_prog->error = err;
return;
}
__emit_lcsr(nfp_prog, reg.areg, reg.breg, true, addr / 4,
false, reg.src_lmextn);
}
static void emit_nop(struct nfp_prog *nfp_prog)
{
__emit_immed(nfp_prog, UR_REG_IMM, UR_REG_IMM, 0, 0, 0, 0, 0, 0, 0);
}
/* --- Wrappers --- */
static bool pack_immed(u32 imm, u16 *val, enum immed_shift *shift)
{
if (!(imm & 0xffff0000)) {
*val = imm;
*shift = IMMED_SHIFT_0B;
} else if (!(imm & 0xff0000ff)) {
*val = imm >> 8;
*shift = IMMED_SHIFT_1B;
} else if (!(imm & 0x0000ffff)) {
*val = imm >> 16;
*shift = IMMED_SHIFT_2B;
} else {
return false;
}
return true;
}
static void wrp_immed(struct nfp_prog *nfp_prog, swreg dst, u32 imm)
{
enum immed_shift shift;
u16 val;
if (pack_immed(imm, &val, &shift)) {
emit_immed(nfp_prog, dst, val, IMMED_WIDTH_ALL, false, shift);
} else if (pack_immed(~imm, &val, &shift)) {
emit_immed(nfp_prog, dst, val, IMMED_WIDTH_ALL, true, shift);
} else {
emit_immed(nfp_prog, dst, imm & 0xffff, IMMED_WIDTH_ALL,
false, IMMED_SHIFT_0B);
emit_immed(nfp_prog, dst, imm >> 16, IMMED_WIDTH_WORD,
false, IMMED_SHIFT_2B);
}
}
/* ur_load_imm_any() - encode immediate or use tmp register (unrestricted)
* If the @imm is small enough encode it directly in operand and return
* otherwise load @imm to a spare register and return its encoding.
*/
static swreg ur_load_imm_any(struct nfp_prog *nfp_prog, u32 imm, swreg tmp_reg)
{
if (FIELD_FIT(UR_REG_IMM_MAX, imm))
return reg_imm(imm);
wrp_immed(nfp_prog, tmp_reg, imm);
return tmp_reg;
}
/* re_load_imm_any() - encode immediate or use tmp register (restricted)
* If the @imm is small enough encode it directly in operand and return
* otherwise load @imm to a spare register and return its encoding.
*/
static swreg re_load_imm_any(struct nfp_prog *nfp_prog, u32 imm, swreg tmp_reg)
{
if (FIELD_FIT(RE_REG_IMM_MAX, imm))
return reg_imm(imm);
wrp_immed(nfp_prog, tmp_reg, imm);
return tmp_reg;
}
static void wrp_nops(struct nfp_prog *nfp_prog, unsigned int count)
{
while (count--)
emit_nop(nfp_prog);
}
static void
wrp_br_special(struct nfp_prog *nfp_prog, enum br_mask mask,
enum br_special special)
{
emit_br(nfp_prog, mask, 0, 0);
nfp_prog->prog[nfp_prog->prog_len - 1] |=
FIELD_PREP(OP_BR_SPECIAL, special);
}
static void wrp_mov(struct nfp_prog *nfp_prog, swreg dst, swreg src)
{
emit_alu(nfp_prog, dst, reg_none(), ALU_OP_NONE, src);
}
static void wrp_reg_mov(struct nfp_prog *nfp_prog, u16 dst, u16 src)
{
wrp_mov(nfp_prog, reg_both(dst), reg_b(src));
}
static int
data_ld(struct nfp_prog *nfp_prog, swreg offset, u8 dst_gpr, int size)
{
unsigned int i;
u16 shift, sz;
/* We load the value from the address indicated in @offset and then
* shift out the data we don't need. Note: this is big endian!
*/
sz = max(size, 4);
shift = size < 4 ? 4 - size : 0;
emit_cmd(nfp_prog, CMD_TGT_READ8, CMD_MODE_32b, 0,
pptr_reg(nfp_prog), offset, sz - 1, true);
i = 0;
if (shift)
emit_shf(nfp_prog, reg_both(dst_gpr), reg_none(), SHF_OP_NONE,
reg_xfer(0), SHF_SC_R_SHF, shift * 8);
else
for (; i * 4 < size; i++)
wrp_mov(nfp_prog, reg_both(dst_gpr + i), reg_xfer(i));
if (i < 2)
wrp_immed(nfp_prog, reg_both(dst_gpr + 1), 0);
return 0;
}
static int
data_ld_host_order(struct nfp_prog *nfp_prog, u8 src_gpr, swreg offset,
u8 dst_gpr, int size)
{
unsigned int i;
u8 mask, sz;
/* We load the value from the address indicated in @offset and then
* mask out the data we don't need. Note: this is little endian!
*/
sz = max(size, 4);
mask = size < 4 ? GENMASK(size - 1, 0) : 0;
emit_cmd(nfp_prog, CMD_TGT_READ32_SWAP, CMD_MODE_32b, 0,
reg_a(src_gpr), offset, sz / 4 - 1, true);
i = 0;
if (mask)
emit_ld_field_any(nfp_prog, reg_both(dst_gpr), mask,
reg_xfer(0), SHF_SC_NONE, 0, true);
else
for (; i * 4 < size; i++)
wrp_mov(nfp_prog, reg_both(dst_gpr + i), reg_xfer(i));
if (i < 2)
wrp_immed(nfp_prog, reg_both(dst_gpr + 1), 0);
return 0;
}
static int
construct_data_ind_ld(struct nfp_prog *nfp_prog, u16 offset, u16 src, u8 size)
{
swreg tmp_reg;
/* Calculate the true offset (src_reg + imm) */
tmp_reg = ur_load_imm_any(nfp_prog, offset, imm_b(nfp_prog));
emit_alu(nfp_prog, imm_both(nfp_prog), reg_a(src), ALU_OP_ADD, tmp_reg);
/* Check packet length (size guaranteed to fit b/c it's u8) */
emit_alu(nfp_prog, imm_a(nfp_prog),
imm_a(nfp_prog), ALU_OP_ADD, reg_imm(size));
emit_alu(nfp_prog, reg_none(),
plen_reg(nfp_prog), ALU_OP_SUB, imm_a(nfp_prog));
wrp_br_special(nfp_prog, BR_BLO, OP_BR_GO_ABORT);
/* Load data */
return data_ld(nfp_prog, imm_b(nfp_prog), 0, size);
}
static int construct_data_ld(struct nfp_prog *nfp_prog, u16 offset, u8 size)
{
swreg tmp_reg;
/* Check packet length */
tmp_reg = ur_load_imm_any(nfp_prog, offset + size, imm_a(nfp_prog));
emit_alu(nfp_prog, reg_none(), plen_reg(nfp_prog), ALU_OP_SUB, tmp_reg);
wrp_br_special(nfp_prog, BR_BLO, OP_BR_GO_ABORT);
/* Load data */
tmp_reg = re_load_imm_any(nfp_prog, offset, imm_b(nfp_prog));
return data_ld(nfp_prog, tmp_reg, 0, size);
}
static int
data_stx_host_order(struct nfp_prog *nfp_prog, u8 dst_gpr, swreg offset,
u8 src_gpr, u8 size)
{
unsigned int i;
for (i = 0; i * 4 < size; i++)
wrp_mov(nfp_prog, reg_xfer(i), reg_a(src_gpr + i));
emit_cmd(nfp_prog, CMD_TGT_WRITE8_SWAP, CMD_MODE_32b, 0,
reg_a(dst_gpr), offset, size - 1, true);
return 0;
}
static int
data_st_host_order(struct nfp_prog *nfp_prog, u8 dst_gpr, swreg offset,
u64 imm, u8 size)
{
wrp_immed(nfp_prog, reg_xfer(0), imm);
if (size == 8)
wrp_immed(nfp_prog, reg_xfer(1), imm >> 32);
emit_cmd(nfp_prog, CMD_TGT_WRITE8_SWAP, CMD_MODE_32b, 0,
reg_a(dst_gpr), offset, size - 1, true);
return 0;
}
typedef int
(*lmem_step)(struct nfp_prog *nfp_prog, u8 gpr, u8 gpr_byte, s32 off,
unsigned int size, bool first, bool new_gpr, bool last, bool lm3,
bool needs_inc);
static int
wrp_lmem_load(struct nfp_prog *nfp_prog, u8 dst, u8 dst_byte, s32 off,
unsigned int size, bool first, bool new_gpr, bool last, bool lm3,
bool needs_inc)
{
bool should_inc = needs_inc && new_gpr && !last;
u32 idx, src_byte;
enum shf_sc sc;
swreg reg;
int shf;
u8 mask;
if (WARN_ON_ONCE(dst_byte + size > 4 || off % 4 + size > 4))
return -EOPNOTSUPP;
idx = off / 4;
/* Move the entire word */
if (size == 4) {
wrp_mov(nfp_prog, reg_both(dst),
should_inc ? reg_lm_inc(3) : reg_lm(lm3 ? 3 : 0, idx));
return 0;
}
if (WARN_ON_ONCE(lm3 && idx > RE_REG_LM_IDX_MAX))
return -EOPNOTSUPP;
src_byte = off % 4;
mask = (1 << size) - 1;
mask <<= dst_byte;
if (WARN_ON_ONCE(mask > 0xf))
return -EOPNOTSUPP;
shf = abs(src_byte - dst_byte) * 8;
if (src_byte == dst_byte) {
sc = SHF_SC_NONE;
} else if (src_byte < dst_byte) {
shf = 32 - shf;
sc = SHF_SC_L_SHF;
} else {
sc = SHF_SC_R_SHF;
}
/* ld_field can address fewer indexes, if offset too large do RMW.
* Because we RMV twice we waste 2 cycles on unaligned 8 byte writes.
*/
if (idx <= RE_REG_LM_IDX_MAX) {
reg = reg_lm(lm3 ? 3 : 0, idx);
} else {
reg = imm_a(nfp_prog);
/* If it's not the first part of the load and we start a new GPR
* that means we are loading a second part of the LMEM word into
* a new GPR. IOW we've already looked that LMEM word and
* therefore it has been loaded into imm_a().
*/
if (first || !new_gpr)
wrp_mov(nfp_prog, reg, reg_lm(0, idx));
}
emit_ld_field_any(nfp_prog, reg_both(dst), mask, reg, sc, shf, new_gpr);
if (should_inc)
wrp_mov(nfp_prog, reg_none(), reg_lm_inc(3));
return 0;
}
static int
wrp_lmem_store(struct nfp_prog *nfp_prog, u8 src, u8 src_byte, s32 off,
unsigned int size, bool first, bool new_gpr, bool last, bool lm3,
bool needs_inc)
{
bool should_inc = needs_inc && new_gpr && !last;
u32 idx, dst_byte;
enum shf_sc sc;
swreg reg;
int shf;
u8 mask;
if (WARN_ON_ONCE(src_byte + size > 4 || off % 4 + size > 4))
return -EOPNOTSUPP;
idx = off / 4;
/* Move the entire word */
if (size == 4) {
wrp_mov(nfp_prog,
should_inc ? reg_lm_inc(3) : reg_lm(lm3 ? 3 : 0, idx),
reg_b(src));
return 0;
}
if (WARN_ON_ONCE(lm3 && idx > RE_REG_LM_IDX_MAX))
return -EOPNOTSUPP;
dst_byte = off % 4;
mask = (1 << size) - 1;
mask <<= dst_byte;
if (WARN_ON_ONCE(mask > 0xf))
return -EOPNOTSUPP;
shf = abs(src_byte - dst_byte) * 8;
if (src_byte == dst_byte) {
sc = SHF_SC_NONE;
} else if (src_byte < dst_byte) {
shf = 32 - shf;
sc = SHF_SC_L_SHF;
} else {
sc = SHF_SC_R_SHF;
}
/* ld_field can address fewer indexes, if offset too large do RMW.
* Because we RMV twice we waste 2 cycles on unaligned 8 byte writes.
*/
if (idx <= RE_REG_LM_IDX_MAX) {
reg = reg_lm(lm3 ? 3 : 0, idx);
} else {
reg = imm_a(nfp_prog);
/* Only first and last LMEM locations are going to need RMW,
* the middle location will be overwritten fully.
*/
if (first || last)
wrp_mov(nfp_prog, reg, reg_lm(0, idx));
}
emit_ld_field(nfp_prog, reg, mask, reg_b(src), sc, shf);
if (new_gpr || last) {
if (idx > RE_REG_LM_IDX_MAX)
wrp_mov(nfp_prog, reg_lm(0, idx), reg);
if (should_inc)
wrp_mov(nfp_prog, reg_none(), reg_lm_inc(3));
}
return 0;
}
static int
mem_op_stack(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta,
unsigned int size, unsigned int ptr_off, u8 gpr, u8 ptr_gpr,
bool clr_gpr, lmem_step step)
{
s32 off = nfp_prog->stack_depth + meta->insn.off + ptr_off;
bool first = true, last;
bool needs_inc = false;
swreg stack_off_reg;
u8 prev_gpr = 255;
u32 gpr_byte = 0;
bool lm3 = true;
int ret;
if (meta->ptr_not_const) {
/* Use of the last encountered ptr_off is OK, they all have
* the same alignment. Depend on low bits of value being
* discarded when written to LMaddr register.
*/
stack_off_reg = ur_load_imm_any(nfp_prog, meta->insn.off,
stack_imm(nfp_prog));
emit_alu(nfp_prog, imm_b(nfp_prog),
reg_a(ptr_gpr), ALU_OP_ADD, stack_off_reg);
needs_inc = true;
} else if (off + size <= 64) {
/* We can reach bottom 64B with LMaddr0 */
lm3 = false;
} else if (round_down(off, 32) == round_down(off + size - 1, 32)) {
/* We have to set up a new pointer. If we know the offset
* and the entire access falls into a single 32 byte aligned
* window we won't have to increment the LM pointer.
* The 32 byte alignment is imporant because offset is ORed in
* not added when doing *l$indexN[off].
*/
stack_off_reg = ur_load_imm_any(nfp_prog, round_down(off, 32),
stack_imm(nfp_prog));
emit_alu(nfp_prog, imm_b(nfp_prog),
stack_reg(nfp_prog), ALU_OP_ADD, stack_off_reg);
off %= 32;
} else {
stack_off_reg = ur_load_imm_any(nfp_prog, round_down(off, 4),
stack_imm(nfp_prog));
emit_alu(nfp_prog, imm_b(nfp_prog),
stack_reg(nfp_prog), ALU_OP_ADD, stack_off_reg);
needs_inc = true;
}
if (lm3) {
emit_csr_wr(nfp_prog, imm_b(nfp_prog), NFP_CSR_ACT_LM_ADDR3);
/* For size < 4 one slot will be filled by zeroing of upper. */
wrp_nops(nfp_prog, clr_gpr && size < 8 ? 2 : 3);
}
if (clr_gpr && size < 8)
wrp_immed(nfp_prog, reg_both(gpr + 1), 0);
while (size) {
u32 slice_end;
u8 slice_size;
slice_size = min(size, 4 - gpr_byte);
slice_end = min(off + slice_size, round_up(off + 1, 4));
slice_size = slice_end - off;
last = slice_size == size;
if (needs_inc)
off %= 4;
ret = step(nfp_prog, gpr, gpr_byte, off, slice_size,
first, gpr != prev_gpr, last, lm3, needs_inc);
if (ret)
return ret;
prev_gpr = gpr;
first = false;
gpr_byte += slice_size;
if (gpr_byte >= 4) {
gpr_byte -= 4;
gpr++;
}
size -= slice_size;
off += slice_size;
}
return 0;
}
static void
wrp_alu_imm(struct nfp_prog *nfp_prog, u8 dst, enum alu_op alu_op, u32 imm)
{
swreg tmp_reg;
if (alu_op == ALU_OP_AND) {
if (!imm)
wrp_immed(nfp_prog, reg_both(dst), 0);
if (!imm || !~imm)
return;
}
if (alu_op == ALU_OP_OR) {
if (!~imm)
wrp_immed(nfp_prog, reg_both(dst), ~0U);
if (!imm || !~imm)
return;
}
if (alu_op == ALU_OP_XOR) {
if (!~imm)
emit_alu(nfp_prog, reg_both(dst), reg_none(),
ALU_OP_NEG, reg_b(dst));
if (!imm || !~imm)
return;
}
tmp_reg = ur_load_imm_any(nfp_prog, imm, imm_b(nfp_prog));
emit_alu(nfp_prog, reg_both(dst), reg_a(dst), alu_op, tmp_reg);
}
static int
wrp_alu64_imm(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta,
enum alu_op alu_op, bool skip)
{
const struct bpf_insn *insn = &meta->insn;
u64 imm = insn->imm; /* sign extend */
if (skip) {
meta->skip = true;
return 0;
}
wrp_alu_imm(nfp_prog, insn->dst_reg * 2, alu_op, imm & ~0U);
wrp_alu_imm(nfp_prog, insn->dst_reg * 2 + 1, alu_op, imm >> 32);
return 0;
}
static int
wrp_alu64_reg(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta,
enum alu_op alu_op)
{
u8 dst = meta->insn.dst_reg * 2, src = meta->insn.src_reg * 2;
emit_alu(nfp_prog, reg_both(dst), reg_a(dst), alu_op, reg_b(src));
emit_alu(nfp_prog, reg_both(dst + 1),
reg_a(dst + 1), alu_op, reg_b(src + 1));
return 0;
}
static int
wrp_alu32_imm(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta,
enum alu_op alu_op, bool skip)
{
const struct bpf_insn *insn = &meta->insn;
if (skip) {
meta->skip = true;
return 0;
}
wrp_alu_imm(nfp_prog, insn->dst_reg * 2, alu_op, insn->imm);
wrp_immed(nfp_prog, reg_both(insn->dst_reg * 2 + 1), 0);
return 0;
}
static int
wrp_alu32_reg(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta,
enum alu_op alu_op)
{
u8 dst = meta->insn.dst_reg * 2, src = meta->insn.src_reg * 2;
emit_alu(nfp_prog, reg_both(dst), reg_a(dst), alu_op, reg_b(src));
wrp_immed(nfp_prog, reg_both(meta->insn.dst_reg * 2 + 1), 0);
return 0;
}
static void
wrp_test_reg_one(struct nfp_prog *nfp_prog, u8 dst, enum alu_op alu_op, u8 src,
enum br_mask br_mask, u16 off)
{
emit_alu(nfp_prog, reg_none(), reg_a(dst), alu_op, reg_b(src));
emit_br(nfp_prog, br_mask, off, 0);
}
static int
wrp_test_reg(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta,
enum alu_op alu_op, enum br_mask br_mask)
{
const struct bpf_insn *insn = &meta->insn;
if (insn->off < 0) /* TODO */
return -EOPNOTSUPP;
wrp_test_reg_one(nfp_prog, insn->dst_reg * 2, alu_op,
insn->src_reg * 2, br_mask, insn->off);
wrp_test_reg_one(nfp_prog, insn->dst_reg * 2 + 1, alu_op,
insn->src_reg * 2 + 1, br_mask, insn->off);
return 0;
}
static int
wrp_cmp_imm(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta,
enum br_mask br_mask, bool swap)
{
const struct bpf_insn *insn = &meta->insn;
u64 imm = insn->imm; /* sign extend */
u8 reg = insn->dst_reg * 2;
swreg tmp_reg;
if (insn->off < 0) /* TODO */
return -EOPNOTSUPP;
tmp_reg = ur_load_imm_any(nfp_prog, imm & ~0U, imm_b(nfp_prog));
if (!swap)
emit_alu(nfp_prog, reg_none(), reg_a(reg), ALU_OP_SUB, tmp_reg);
else
emit_alu(nfp_prog, reg_none(), tmp_reg, ALU_OP_SUB, reg_a(reg));
tmp_reg = ur_load_imm_any(nfp_prog, imm >> 32, imm_b(nfp_prog));
if (!swap)
emit_alu(nfp_prog, reg_none(),
reg_a(reg + 1), ALU_OP_SUB_C, tmp_reg);
else
emit_alu(nfp_prog, reg_none(),
tmp_reg, ALU_OP_SUB_C, reg_a(reg + 1));
emit_br(nfp_prog, br_mask, insn->off, 0);
return 0;
}
static int
wrp_cmp_reg(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta,
enum br_mask br_mask, bool swap)
{
const struct bpf_insn *insn = &meta->insn;
u8 areg, breg;
areg = insn->dst_reg * 2;
breg = insn->src_reg * 2;
if (insn->off < 0) /* TODO */
return -EOPNOTSUPP;
if (swap) {
areg ^= breg;
breg ^= areg;
areg ^= breg;
}
emit_alu(nfp_prog, reg_none(), reg_a(areg), ALU_OP_SUB, reg_b(breg));
emit_alu(nfp_prog, reg_none(),
reg_a(areg + 1), ALU_OP_SUB_C, reg_b(breg + 1));
emit_br(nfp_prog, br_mask, insn->off, 0);
return 0;
}
static void wrp_end32(struct nfp_prog *nfp_prog, swreg reg_in, u8 gpr_out)
{
emit_ld_field(nfp_prog, reg_both(gpr_out), 0xf, reg_in,
SHF_SC_R_ROT, 8);
emit_ld_field(nfp_prog, reg_both(gpr_out), 0x5, reg_a(gpr_out),
SHF_SC_R_ROT, 16);
}
/* --- Callbacks --- */
static int mov_reg64(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
{
const struct bpf_insn *insn = &meta->insn;
u8 dst = insn->dst_reg * 2;
u8 src = insn->src_reg * 2;
if (insn->src_reg == BPF_REG_10) {
swreg stack_depth_reg;
stack_depth_reg = ur_load_imm_any(nfp_prog,
nfp_prog->stack_depth,
stack_imm(nfp_prog));
emit_alu(nfp_prog, reg_both(dst),
stack_reg(nfp_prog), ALU_OP_ADD, stack_depth_reg);
wrp_immed(nfp_prog, reg_both(dst + 1), 0);
} else {
wrp_reg_mov(nfp_prog, dst, src);
wrp_reg_mov(nfp_prog, dst + 1, src + 1);
}
return 0;
}
static int mov_imm64(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
{
u64 imm = meta->insn.imm; /* sign extend */
wrp_immed(nfp_prog, reg_both(meta->insn.dst_reg * 2), imm & ~0U);
wrp_immed(nfp_prog, reg_both(meta->insn.dst_reg * 2 + 1), imm >> 32);
return 0;
}
static int xor_reg64(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
{
return wrp_alu64_reg(nfp_prog, meta, ALU_OP_XOR);
}
static int xor_imm64(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
{
return wrp_alu64_imm(nfp_prog, meta, ALU_OP_XOR, !meta->insn.imm);
}
static int and_reg64(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
{
return wrp_alu64_reg(nfp_prog, meta, ALU_OP_AND);
}
static int and_imm64(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
{
return wrp_alu64_imm(nfp_prog, meta, ALU_OP_AND, !~meta->insn.imm);
}
static int or_reg64(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
{
return wrp_alu64_reg(nfp_prog, meta, ALU_OP_OR);
}
static int or_imm64(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
{
return wrp_alu64_imm(nfp_prog, meta, ALU_OP_OR, !meta->insn.imm);
}
static int add_reg64(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
{
const struct bpf_insn *insn = &meta->insn;
emit_alu(nfp_prog, reg_both(insn->dst_reg * 2),
reg_a(insn->dst_reg * 2), ALU_OP_ADD,
reg_b(insn->src_reg * 2));
emit_alu(nfp_prog, reg_both(insn->dst_reg * 2 + 1),
reg_a(insn->dst_reg * 2 + 1), ALU_OP_ADD_C,
reg_b(insn->src_reg * 2 + 1));
return 0;
}
static int add_imm64(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
{
const struct bpf_insn *insn = &meta->insn;
u64 imm = insn->imm; /* sign extend */
wrp_alu_imm(nfp_prog, insn->dst_reg * 2, ALU_OP_ADD, imm & ~0U);
wrp_alu_imm(nfp_prog, insn->dst_reg * 2 + 1, ALU_OP_ADD_C, imm >> 32);
return 0;
}
static int sub_reg64(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
{
const struct bpf_insn *insn = &meta->insn;
emit_alu(nfp_prog, reg_both(insn->dst_reg * 2),
reg_a(insn->dst_reg * 2), ALU_OP_SUB,
reg_b(insn->src_reg * 2));
emit_alu(nfp_prog, reg_both(insn->dst_reg * 2 + 1),
reg_a(insn->dst_reg * 2 + 1), ALU_OP_SUB_C,
reg_b(insn->src_reg * 2 + 1));
return 0;
}
static int sub_imm64(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
{
const struct bpf_insn *insn = &meta->insn;
u64 imm = insn->imm; /* sign extend */
wrp_alu_imm(nfp_prog, insn->dst_reg * 2, ALU_OP_SUB, imm & ~0U);
wrp_alu_imm(nfp_prog, insn->dst_reg * 2 + 1, ALU_OP_SUB_C, imm >> 32);
return 0;
}
static int shl_imm64(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
{
const struct bpf_insn *insn = &meta->insn;
u8 dst = insn->dst_reg * 2;
if (insn->imm < 32) {
emit_shf(nfp_prog, reg_both(dst + 1),
reg_a(dst + 1), SHF_OP_NONE, reg_b(dst),
SHF_SC_R_DSHF, 32 - insn->imm);
emit_shf(nfp_prog, reg_both(dst),
reg_none(), SHF_OP_NONE, reg_b(dst),
SHF_SC_L_SHF, insn->imm);
} else if (insn->imm == 32) {
wrp_reg_mov(nfp_prog, dst + 1, dst);
wrp_immed(nfp_prog, reg_both(dst), 0);
} else if (insn->imm > 32) {
emit_shf(nfp_prog, reg_both(dst + 1),
reg_none(), SHF_OP_NONE, reg_b(dst),
SHF_SC_L_SHF, insn->imm - 32);
wrp_immed(nfp_prog, reg_both(dst), 0);
}
return 0;
}
static int shr_imm64(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
{
const struct bpf_insn *insn = &meta->insn;
u8 dst = insn->dst_reg * 2;
if (insn->imm < 32) {
emit_shf(nfp_prog, reg_both(dst),
reg_a(dst + 1), SHF_OP_NONE, reg_b(dst),
SHF_SC_R_DSHF, insn->imm);
emit_shf(nfp_prog, reg_both(dst + 1),
reg_none(), SHF_OP_NONE, reg_b(dst + 1),
SHF_SC_R_SHF, insn->imm);
} else if (insn->imm == 32) {
wrp_reg_mov(nfp_prog, dst, dst + 1);
wrp_immed(nfp_prog, reg_both(dst + 1), 0);
} else if (insn->imm > 32) {
emit_shf(nfp_prog, reg_both(dst),
reg_none(), SHF_OP_NONE, reg_b(dst + 1),
SHF_SC_R_SHF, insn->imm - 32);
wrp_immed(nfp_prog, reg_both(dst + 1), 0);
}
return 0;
}
static int mov_reg(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
{
const struct bpf_insn *insn = &meta->insn;
wrp_reg_mov(nfp_prog, insn->dst_reg * 2, insn->src_reg * 2);
wrp_immed(nfp_prog, reg_both(insn->dst_reg * 2 + 1), 0);
return 0;
}
static int mov_imm(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
{
const struct bpf_insn *insn = &meta->insn;
wrp_immed(nfp_prog, reg_both(insn->dst_reg * 2), insn->imm);
wrp_immed(nfp_prog, reg_both(insn->dst_reg * 2 + 1), 0);
return 0;
}
static int xor_reg(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
{
return wrp_alu32_reg(nfp_prog, meta, ALU_OP_XOR);
}
static int xor_imm(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
{
return wrp_alu32_imm(nfp_prog, meta, ALU_OP_XOR, !~meta->insn.imm);
}
static int and_reg(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
{
return wrp_alu32_reg(nfp_prog, meta, ALU_OP_AND);
}
static int and_imm(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
{
return wrp_alu32_imm(nfp_prog, meta, ALU_OP_AND, !~meta->insn.imm);
}
static int or_reg(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
{
return wrp_alu32_reg(nfp_prog, meta, ALU_OP_OR);
}
static int or_imm(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
{
return wrp_alu32_imm(nfp_prog, meta, ALU_OP_OR, !meta->insn.imm);
}
static int add_reg(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
{
return wrp_alu32_reg(nfp_prog, meta, ALU_OP_ADD);
}
static int add_imm(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
{
return wrp_alu32_imm(nfp_prog, meta, ALU_OP_ADD, !meta->insn.imm);
}
static int sub_reg(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
{
return wrp_alu32_reg(nfp_prog, meta, ALU_OP_SUB);
}
static int sub_imm(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
{
return wrp_alu32_imm(nfp_prog, meta, ALU_OP_SUB, !meta->insn.imm);
}
static int shl_imm(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
{
const struct bpf_insn *insn = &meta->insn;
if (!insn->imm)
return 1; /* TODO: zero shift means indirect */
emit_shf(nfp_prog, reg_both(insn->dst_reg * 2),
reg_none(), SHF_OP_NONE, reg_b(insn->dst_reg * 2),
SHF_SC_L_SHF, insn->imm);
wrp_immed(nfp_prog, reg_both(insn->dst_reg * 2 + 1), 0);
return 0;
}
static int end_reg32(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
{
const struct bpf_insn *insn = &meta->insn;
u8 gpr = insn->dst_reg * 2;
switch (insn->imm) {
case 16:
emit_ld_field(nfp_prog, reg_both(gpr), 0x9, reg_b(gpr),
SHF_SC_R_ROT, 8);
emit_ld_field(nfp_prog, reg_both(gpr), 0xe, reg_a(gpr),
SHF_SC_R_SHF, 16);
wrp_immed(nfp_prog, reg_both(gpr + 1), 0);
break;
case 32:
wrp_end32(nfp_prog, reg_a(gpr), gpr);
wrp_immed(nfp_prog, reg_both(gpr + 1), 0);
break;
case 64:
wrp_mov(nfp_prog, imm_a(nfp_prog), reg_b(gpr + 1));
wrp_end32(nfp_prog, reg_a(gpr), gpr + 1);
wrp_end32(nfp_prog, imm_a(nfp_prog), gpr);
break;
}
return 0;
}
static int imm_ld8_part2(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
{
struct nfp_insn_meta *prev = nfp_meta_prev(meta);
u32 imm_lo, imm_hi;
u8 dst;
dst = prev->insn.dst_reg * 2;
imm_lo = prev->insn.imm;
imm_hi = meta->insn.imm;
wrp_immed(nfp_prog, reg_both(dst), imm_lo);
/* mov is always 1 insn, load imm may be two, so try to use mov */
if (imm_hi == imm_lo)
wrp_mov(nfp_prog, reg_both(dst + 1), reg_a(dst));
else
wrp_immed(nfp_prog, reg_both(dst + 1), imm_hi);
return 0;
}
static int imm_ld8(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
{
meta->double_cb = imm_ld8_part2;
return 0;
}
static int data_ld1(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
{
return construct_data_ld(nfp_prog, meta->insn.imm, 1);
}
static int data_ld2(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
{
return construct_data_ld(nfp_prog, meta->insn.imm, 2);
}
static int data_ld4(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
{
return construct_data_ld(nfp_prog, meta->insn.imm, 4);
}
static int data_ind_ld1(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
{
return construct_data_ind_ld(nfp_prog, meta->insn.imm,
meta->insn.src_reg * 2, 1);
}
static int data_ind_ld2(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
{
return construct_data_ind_ld(nfp_prog, meta->insn.imm,
meta->insn.src_reg * 2, 2);
}
static int data_ind_ld4(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
{
return construct_data_ind_ld(nfp_prog, meta->insn.imm,
meta->insn.src_reg * 2, 4);
}
static int
mem_ldx_stack(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta,
unsigned int size, unsigned int ptr_off)
{
return mem_op_stack(nfp_prog, meta, size, ptr_off,
meta->insn.dst_reg * 2, meta->insn.src_reg * 2,
true, wrp_lmem_load);
}
static int mem_ldx_skb(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta,
u8 size)
{
swreg dst = reg_both(meta->insn.dst_reg * 2);
switch (meta->insn.off) {
case offsetof(struct sk_buff, len):
if (size != FIELD_SIZEOF(struct sk_buff, len))
return -EOPNOTSUPP;
wrp_mov(nfp_prog, dst, plen_reg(nfp_prog));
break;
case offsetof(struct sk_buff, data):
if (size != sizeof(void *))
return -EOPNOTSUPP;
wrp_mov(nfp_prog, dst, pptr_reg(nfp_prog));
break;
case offsetof(struct sk_buff, cb) +
offsetof(struct bpf_skb_data_end, data_end):
if (size != sizeof(void *))
return -EOPNOTSUPP;
emit_alu(nfp_prog, dst,
plen_reg(nfp_prog), ALU_OP_ADD, pptr_reg(nfp_prog));
break;
default:
return -EOPNOTSUPP;
}
wrp_immed(nfp_prog, reg_both(meta->insn.dst_reg * 2 + 1), 0);
return 0;
}
static int mem_ldx_xdp(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta,
u8 size)
{
swreg dst = reg_both(meta->insn.dst_reg * 2);
if (size != sizeof(void *))
return -EINVAL;
switch (meta->insn.off) {
case offsetof(struct xdp_buff, data):
wrp_mov(nfp_prog, dst, pptr_reg(nfp_prog));
break;
case offsetof(struct xdp_buff, data_end):
emit_alu(nfp_prog, dst,
plen_reg(nfp_prog), ALU_OP_ADD, pptr_reg(nfp_prog));
break;
default:
return -EOPNOTSUPP;
}
wrp_immed(nfp_prog, reg_both(meta->insn.dst_reg * 2 + 1), 0);
return 0;
}
static int
mem_ldx_data(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta,
unsigned int size)
{
swreg tmp_reg;
tmp_reg = re_load_imm_any(nfp_prog, meta->insn.off, imm_b(nfp_prog));
return data_ld_host_order(nfp_prog, meta->insn.src_reg * 2, tmp_reg,
meta->insn.dst_reg * 2, size);
}
static int
mem_ldx(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta,
unsigned int size)
{
if (meta->ptr.type == PTR_TO_CTX) {
if (nfp_prog->act == NN_ACT_XDP)
return mem_ldx_xdp(nfp_prog, meta, size);
else
return mem_ldx_skb(nfp_prog, meta, size);
}
if (meta->ptr.type == PTR_TO_PACKET)
return mem_ldx_data(nfp_prog, meta, size);
if (meta->ptr.type == PTR_TO_STACK)
return mem_ldx_stack(nfp_prog, meta, size,
meta->ptr.off + meta->ptr.var_off.value);
return -EOPNOTSUPP;
}
static int mem_ldx1(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
{
return mem_ldx(nfp_prog, meta, 1);
}
static int mem_ldx2(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
{
return mem_ldx(nfp_prog, meta, 2);
}
static int mem_ldx4(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
{
return mem_ldx(nfp_prog, meta, 4);
}
static int mem_ldx8(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
{
return mem_ldx(nfp_prog, meta, 8);
}
static int
mem_st_data(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta,
unsigned int size)
{
u64 imm = meta->insn.imm; /* sign extend */
swreg off_reg;
off_reg = re_load_imm_any(nfp_prog, meta->insn.off, imm_b(nfp_prog));
return data_st_host_order(nfp_prog, meta->insn.dst_reg * 2, off_reg,
imm, size);
}
static int mem_st(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta,
unsigned int size)
{
if (meta->ptr.type == PTR_TO_PACKET)
return mem_st_data(nfp_prog, meta, size);
return -EOPNOTSUPP;
}
static int mem_st1(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
{
return mem_st(nfp_prog, meta, 1);
}
static int mem_st2(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
{
return mem_st(nfp_prog, meta, 2);
}
static int mem_st4(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
{
return mem_st(nfp_prog, meta, 4);
}
static int mem_st8(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
{
return mem_st(nfp_prog, meta, 8);
}
static int
mem_stx_data(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta,
unsigned int size)
{
swreg off_reg;
off_reg = re_load_imm_any(nfp_prog, meta->insn.off, imm_b(nfp_prog));
return data_stx_host_order(nfp_prog, meta->insn.dst_reg * 2, off_reg,
meta->insn.src_reg * 2, size);
}
static int
mem_stx_stack(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta,
unsigned int size, unsigned int ptr_off)
{
return mem_op_stack(nfp_prog, meta, size, ptr_off,
meta->insn.src_reg * 2, meta->insn.dst_reg * 2,
false, wrp_lmem_store);
}
static int
mem_stx(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta,
unsigned int size)
{
if (meta->ptr.type == PTR_TO_PACKET)
return mem_stx_data(nfp_prog, meta, size);
if (meta->ptr.type == PTR_TO_STACK)
return mem_stx_stack(nfp_prog, meta, size,
meta->ptr.off + meta->ptr.var_off.value);
return -EOPNOTSUPP;
}
static int mem_stx1(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
{
return mem_stx(nfp_prog, meta, 1);
}
static int mem_stx2(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
{
return mem_stx(nfp_prog, meta, 2);
}
static int mem_stx4(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
{
return mem_stx(nfp_prog, meta, 4);
}
static int mem_stx8(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
{
return mem_stx(nfp_prog, meta, 8);
}
static int jump(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
{
if (meta->insn.off < 0) /* TODO */
return -EOPNOTSUPP;
emit_br(nfp_prog, BR_UNC, meta->insn.off, 0);
return 0;
}
static int jeq_imm(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
{
const struct bpf_insn *insn = &meta->insn;
u64 imm = insn->imm; /* sign extend */
swreg or1, or2, tmp_reg;
or1 = reg_a(insn->dst_reg * 2);
or2 = reg_b(insn->dst_reg * 2 + 1);
if (insn->off < 0) /* TODO */
return -EOPNOTSUPP;
if (imm & ~0U) {
tmp_reg = ur_load_imm_any(nfp_prog, imm & ~0U, imm_b(nfp_prog));
emit_alu(nfp_prog, imm_a(nfp_prog),
reg_a(insn->dst_reg * 2), ALU_OP_XOR, tmp_reg);
or1 = imm_a(nfp_prog);
}
if (imm >> 32) {
tmp_reg = ur_load_imm_any(nfp_prog, imm >> 32, imm_b(nfp_prog));
emit_alu(nfp_prog, imm_b(nfp_prog),
reg_a(insn->dst_reg * 2 + 1), ALU_OP_XOR, tmp_reg);
or2 = imm_b(nfp_prog);
}
emit_alu(nfp_prog, reg_none(), or1, ALU_OP_OR, or2);
emit_br(nfp_prog, BR_BEQ, insn->off, 0);
return 0;
}
static int jgt_imm(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
{
return wrp_cmp_imm(nfp_prog, meta, BR_BLO, true);
}
static int jge_imm(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
{
return wrp_cmp_imm(nfp_prog, meta, BR_BHS, false);
}
static int jlt_imm(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
{
return wrp_cmp_imm(nfp_prog, meta, BR_BLO, false);
}
static int jle_imm(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
{
return wrp_cmp_imm(nfp_prog, meta, BR_BHS, true);
}
static int jset_imm(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
{
const struct bpf_insn *insn = &meta->insn;
u64 imm = insn->imm; /* sign extend */
swreg tmp_reg;
if (insn->off < 0) /* TODO */
return -EOPNOTSUPP;
if (!imm) {
meta->skip = true;
return 0;
}
if (imm & ~0U) {
tmp_reg = ur_load_imm_any(nfp_prog, imm & ~0U, imm_b(nfp_prog));
emit_alu(nfp_prog, reg_none(),
reg_a(insn->dst_reg * 2), ALU_OP_AND, tmp_reg);
emit_br(nfp_prog, BR_BNE, insn->off, 0);
}
if (imm >> 32) {
tmp_reg = ur_load_imm_any(nfp_prog, imm >> 32, imm_b(nfp_prog));
emit_alu(nfp_prog, reg_none(),
reg_a(insn->dst_reg * 2 + 1), ALU_OP_AND, tmp_reg);
emit_br(nfp_prog, BR_BNE, insn->off, 0);
}
return 0;
}
static int jne_imm(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
{
const struct bpf_insn *insn = &meta->insn;
u64 imm = insn->imm; /* sign extend */
swreg tmp_reg;
if (insn->off < 0) /* TODO */
return -EOPNOTSUPP;
if (!imm) {
emit_alu(nfp_prog, reg_none(), reg_a(insn->dst_reg * 2),
ALU_OP_OR, reg_b(insn->dst_reg * 2 + 1));
emit_br(nfp_prog, BR_BNE, insn->off, 0);
return 0;
}
tmp_reg = ur_load_imm_any(nfp_prog, imm & ~0U, imm_b(nfp_prog));
emit_alu(nfp_prog, reg_none(),
reg_a(insn->dst_reg * 2), ALU_OP_XOR, tmp_reg);
emit_br(nfp_prog, BR_BNE, insn->off, 0);
tmp_reg = ur_load_imm_any(nfp_prog, imm >> 32, imm_b(nfp_prog));
emit_alu(nfp_prog, reg_none(),
reg_a(insn->dst_reg * 2 + 1), ALU_OP_XOR, tmp_reg);
emit_br(nfp_prog, BR_BNE, insn->off, 0);
return 0;
}
static int jeq_reg(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
{
const struct bpf_insn *insn = &meta->insn;
if (insn->off < 0) /* TODO */
return -EOPNOTSUPP;
emit_alu(nfp_prog, imm_a(nfp_prog), reg_a(insn->dst_reg * 2),
ALU_OP_XOR, reg_b(insn->src_reg * 2));
emit_alu(nfp_prog, imm_b(nfp_prog), reg_a(insn->dst_reg * 2 + 1),
ALU_OP_XOR, reg_b(insn->src_reg * 2 + 1));
emit_alu(nfp_prog, reg_none(),
imm_a(nfp_prog), ALU_OP_OR, imm_b(nfp_prog));
emit_br(nfp_prog, BR_BEQ, insn->off, 0);
return 0;
}
static int jgt_reg(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
{
return wrp_cmp_reg(nfp_prog, meta, BR_BLO, true);
}
static int jge_reg(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
{
return wrp_cmp_reg(nfp_prog, meta, BR_BHS, false);
}
static int jlt_reg(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
{
return wrp_cmp_reg(nfp_prog, meta, BR_BLO, false);
}
static int jle_reg(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
{
return wrp_cmp_reg(nfp_prog, meta, BR_BHS, true);
}
static int jset_reg(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
{
return wrp_test_reg(nfp_prog, meta, ALU_OP_AND, BR_BNE);
}
static int jne_reg(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
{
return wrp_test_reg(nfp_prog, meta, ALU_OP_XOR, BR_BNE);
}
static int goto_out(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
{
wrp_br_special(nfp_prog, BR_UNC, OP_BR_GO_OUT);
return 0;
}
static const instr_cb_t instr_cb[256] = {
[BPF_ALU64 | BPF_MOV | BPF_X] = mov_reg64,
[BPF_ALU64 | BPF_MOV | BPF_K] = mov_imm64,
[BPF_ALU64 | BPF_XOR | BPF_X] = xor_reg64,
[BPF_ALU64 | BPF_XOR | BPF_K] = xor_imm64,
[BPF_ALU64 | BPF_AND | BPF_X] = and_reg64,
[BPF_ALU64 | BPF_AND | BPF_K] = and_imm64,
[BPF_ALU64 | BPF_OR | BPF_X] = or_reg64,
[BPF_ALU64 | BPF_OR | BPF_K] = or_imm64,
[BPF_ALU64 | BPF_ADD | BPF_X] = add_reg64,
[BPF_ALU64 | BPF_ADD | BPF_K] = add_imm64,
[BPF_ALU64 | BPF_SUB | BPF_X] = sub_reg64,
[BPF_ALU64 | BPF_SUB | BPF_K] = sub_imm64,
[BPF_ALU64 | BPF_LSH | BPF_K] = shl_imm64,
[BPF_ALU64 | BPF_RSH | BPF_K] = shr_imm64,
[BPF_ALU | BPF_MOV | BPF_X] = mov_reg,
[BPF_ALU | BPF_MOV | BPF_K] = mov_imm,
[BPF_ALU | BPF_XOR | BPF_X] = xor_reg,
[BPF_ALU | BPF_XOR | BPF_K] = xor_imm,
[BPF_ALU | BPF_AND | BPF_X] = and_reg,
[BPF_ALU | BPF_AND | BPF_K] = and_imm,
[BPF_ALU | BPF_OR | BPF_X] = or_reg,
[BPF_ALU | BPF_OR | BPF_K] = or_imm,
[BPF_ALU | BPF_ADD | BPF_X] = add_reg,
[BPF_ALU | BPF_ADD | BPF_K] = add_imm,
[BPF_ALU | BPF_SUB | BPF_X] = sub_reg,
[BPF_ALU | BPF_SUB | BPF_K] = sub_imm,
[BPF_ALU | BPF_LSH | BPF_K] = shl_imm,
[BPF_ALU | BPF_END | BPF_X] = end_reg32,
[BPF_LD | BPF_IMM | BPF_DW] = imm_ld8,
[BPF_LD | BPF_ABS | BPF_B] = data_ld1,
[BPF_LD | BPF_ABS | BPF_H] = data_ld2,
[BPF_LD | BPF_ABS | BPF_W] = data_ld4,
[BPF_LD | BPF_IND | BPF_B] = data_ind_ld1,
[BPF_LD | BPF_IND | BPF_H] = data_ind_ld2,
[BPF_LD | BPF_IND | BPF_W] = data_ind_ld4,
[BPF_LDX | BPF_MEM | BPF_B] = mem_ldx1,
[BPF_LDX | BPF_MEM | BPF_H] = mem_ldx2,
[BPF_LDX | BPF_MEM | BPF_W] = mem_ldx4,
[BPF_LDX | BPF_MEM | BPF_DW] = mem_ldx8,
[BPF_STX | BPF_MEM | BPF_B] = mem_stx1,
[BPF_STX | BPF_MEM | BPF_H] = mem_stx2,
[BPF_STX | BPF_MEM | BPF_W] = mem_stx4,
[BPF_STX | BPF_MEM | BPF_DW] = mem_stx8,
[BPF_ST | BPF_MEM | BPF_B] = mem_st1,
[BPF_ST | BPF_MEM | BPF_H] = mem_st2,
[BPF_ST | BPF_MEM | BPF_W] = mem_st4,
[BPF_ST | BPF_MEM | BPF_DW] = mem_st8,
[BPF_JMP | BPF_JA | BPF_K] = jump,
[BPF_JMP | BPF_JEQ | BPF_K] = jeq_imm,
[BPF_JMP | BPF_JGT | BPF_K] = jgt_imm,
[BPF_JMP | BPF_JGE | BPF_K] = jge_imm,
[BPF_JMP | BPF_JLT | BPF_K] = jlt_imm,
[BPF_JMP | BPF_JLE | BPF_K] = jle_imm,
[BPF_JMP | BPF_JSET | BPF_K] = jset_imm,
[BPF_JMP | BPF_JNE | BPF_K] = jne_imm,
[BPF_JMP | BPF_JEQ | BPF_X] = jeq_reg,
[BPF_JMP | BPF_JGT | BPF_X] = jgt_reg,
[BPF_JMP | BPF_JGE | BPF_X] = jge_reg,
[BPF_JMP | BPF_JLT | BPF_X] = jlt_reg,
[BPF_JMP | BPF_JLE | BPF_X] = jle_reg,
[BPF_JMP | BPF_JSET | BPF_X] = jset_reg,
[BPF_JMP | BPF_JNE | BPF_X] = jne_reg,
[BPF_JMP | BPF_EXIT] = goto_out,
};
/* --- Misc code --- */
static void br_set_offset(u64 *instr, u16 offset)
{
u16 addr_lo, addr_hi;
addr_lo = offset & (OP_BR_ADDR_LO >> __bf_shf(OP_BR_ADDR_LO));
addr_hi = offset != addr_lo;
*instr &= ~(OP_BR_ADDR_HI | OP_BR_ADDR_LO);
*instr |= FIELD_PREP(OP_BR_ADDR_HI, addr_hi);
*instr |= FIELD_PREP(OP_BR_ADDR_LO, addr_lo);
}
/* --- Assembler logic --- */
static int nfp_fixup_branches(struct nfp_prog *nfp_prog)
{
struct nfp_insn_meta *meta, *next;
u32 off, br_idx;
u32 idx;
nfp_for_each_insn_walk2(nfp_prog, meta, next) {
if (meta->skip)
continue;
if (BPF_CLASS(meta->insn.code) != BPF_JMP)
continue;
br_idx = nfp_prog_offset_to_index(nfp_prog, next->off) - 1;
if (!nfp_is_br(nfp_prog->prog[br_idx])) {
pr_err("Fixup found block not ending in branch %d %02x %016llx!!\n",
br_idx, meta->insn.code, nfp_prog->prog[br_idx]);
return -ELOOP;
}
/* Leave special branches for later */
if (FIELD_GET(OP_BR_SPECIAL, nfp_prog->prog[br_idx]))
continue;
/* Find the target offset in assembler realm */
off = meta->insn.off;
if (!off) {
pr_err("Fixup found zero offset!!\n");
return -ELOOP;
}
while (off && nfp_meta_has_next(nfp_prog, next)) {
next = nfp_meta_next(next);
off--;
}
if (off) {
pr_err("Fixup found too large jump!! %d\n", off);
return -ELOOP;
}
if (next->skip) {
pr_err("Branch landing on removed instruction!!\n");
return -ELOOP;
}
for (idx = nfp_prog_offset_to_index(nfp_prog, meta->off);
idx <= br_idx; idx++) {
if (!nfp_is_br(nfp_prog->prog[idx]))
continue;
br_set_offset(&nfp_prog->prog[idx], next->off);
}
}
/* Fixup 'goto out's separately, they can be scattered around */
for (br_idx = 0; br_idx < nfp_prog->prog_len; br_idx++) {
enum br_special special;
if ((nfp_prog->prog[br_idx] & OP_BR_BASE_MASK) != OP_BR_BASE)
continue;
special = FIELD_GET(OP_BR_SPECIAL, nfp_prog->prog[br_idx]);
switch (special) {
case OP_BR_NORMAL:
break;
case OP_BR_GO_OUT:
br_set_offset(&nfp_prog->prog[br_idx],
nfp_prog->tgt_out);
break;
case OP_BR_GO_ABORT:
br_set_offset(&nfp_prog->prog[br_idx],
nfp_prog->tgt_abort);
break;
}
nfp_prog->prog[br_idx] &= ~OP_BR_SPECIAL;
}
return 0;
}
static void nfp_intro(struct nfp_prog *nfp_prog)
{
wrp_immed(nfp_prog, plen_reg(nfp_prog), GENMASK(13, 0));
emit_alu(nfp_prog, plen_reg(nfp_prog),
plen_reg(nfp_prog), ALU_OP_AND, pv_len(nfp_prog));
}
static void nfp_outro_tc_legacy(struct nfp_prog *nfp_prog)
{
const u8 act2code[] = {
[NN_ACT_TC_DROP] = 0x22,
[NN_ACT_TC_REDIR] = 0x24
};
/* Target for aborts */
nfp_prog->tgt_abort = nfp_prog_current_offset(nfp_prog);
wrp_immed(nfp_prog, reg_both(0), 0);
/* Target for normal exits */
nfp_prog->tgt_out = nfp_prog_current_offset(nfp_prog);
/* Legacy TC mode:
* 0 0x11 -> pass, count as stat0
* -1 drop 0x22 -> drop, count as stat1
* redir 0x24 -> redir, count as stat1
* ife mark 0x21 -> pass, count as stat1
* ife + tx 0x24 -> redir, count as stat1
*/
emit_br_byte_neq(nfp_prog, reg_b(0), 0xff, 0, nfp_prog->tgt_done, 2);
wrp_mov(nfp_prog, reg_a(0), NFP_BPF_ABI_FLAGS);
emit_ld_field(nfp_prog, reg_a(0), 0xc, reg_imm(0x11), SHF_SC_L_SHF, 16);
emit_br(nfp_prog, BR_UNC, nfp_prog->tgt_done, 1);
emit_ld_field(nfp_prog, reg_a(0), 0xc, reg_imm(act2code[nfp_prog->act]),
SHF_SC_L_SHF, 16);
}
static void nfp_outro_tc_da(struct nfp_prog *nfp_prog)
{
/* TC direct-action mode:
* 0,1 ok NOT SUPPORTED[1]
* 2 drop 0x22 -> drop, count as stat1
* 4,5 nuke 0x02 -> drop
* 7 redir 0x44 -> redir, count as stat2
* * unspec 0x11 -> pass, count as stat0
*
* [1] We can't support OK and RECLASSIFY because we can't tell TC
* the exact decision made. We are forced to support UNSPEC
* to handle aborts so that's the only one we handle for passing
* packets up the stack.
*/
/* Target for aborts */
nfp_prog->tgt_abort = nfp_prog_current_offset(nfp_prog);
emit_br_def(nfp_prog, nfp_prog->tgt_done, 2);
wrp_mov(nfp_prog, reg_a(0), NFP_BPF_ABI_FLAGS);
emit_ld_field(nfp_prog, reg_a(0), 0xc, reg_imm(0x11), SHF_SC_L_SHF, 16);
/* Target for normal exits */
nfp_prog->tgt_out = nfp_prog_current_offset(nfp_prog);
/* if R0 > 7 jump to abort */
emit_alu(nfp_prog, reg_none(), reg_imm(7), ALU_OP_SUB, reg_b(0));
emit_br(nfp_prog, BR_BLO, nfp_prog->tgt_abort, 0);
wrp_mov(nfp_prog, reg_a(0), NFP_BPF_ABI_FLAGS);
wrp_immed(nfp_prog, reg_b(2), 0x41221211);
wrp_immed(nfp_prog, reg_b(3), 0x41001211);
emit_shf(nfp_prog, reg_a(1),
reg_none(), SHF_OP_NONE, reg_b(0), SHF_SC_L_SHF, 2);
emit_alu(nfp_prog, reg_none(), reg_a(1), ALU_OP_OR, reg_imm(0));
emit_shf(nfp_prog, reg_a(2),
reg_imm(0xf), SHF_OP_AND, reg_b(2), SHF_SC_R_SHF, 0);
emit_alu(nfp_prog, reg_none(), reg_a(1), ALU_OP_OR, reg_imm(0));
emit_shf(nfp_prog, reg_b(2),
reg_imm(0xf), SHF_OP_AND, reg_b(3), SHF_SC_R_SHF, 0);
emit_br_def(nfp_prog, nfp_prog->tgt_done, 2);
emit_shf(nfp_prog, reg_b(2),
reg_a(2), SHF_OP_OR, reg_b(2), SHF_SC_L_SHF, 4);
emit_ld_field(nfp_prog, reg_a(0), 0xc, reg_b(2), SHF_SC_L_SHF, 16);
}
static void nfp_outro_xdp(struct nfp_prog *nfp_prog)
{
/* XDP return codes:
* 0 aborted 0x82 -> drop, count as stat3
* 1 drop 0x22 -> drop, count as stat1
* 2 pass 0x11 -> pass, count as stat0
* 3 tx 0x44 -> redir, count as stat2
* * unknown 0x82 -> drop, count as stat3
*/
/* Target for aborts */
nfp_prog->tgt_abort = nfp_prog_current_offset(nfp_prog);
emit_br_def(nfp_prog, nfp_prog->tgt_done, 2);
wrp_mov(nfp_prog, reg_a(0), NFP_BPF_ABI_FLAGS);
emit_ld_field(nfp_prog, reg_a(0), 0xc, reg_imm(0x82), SHF_SC_L_SHF, 16);
/* Target for normal exits */
nfp_prog->tgt_out = nfp_prog_current_offset(nfp_prog);
/* if R0 > 3 jump to abort */
emit_alu(nfp_prog, reg_none(), reg_imm(3), ALU_OP_SUB, reg_b(0));
emit_br(nfp_prog, BR_BLO, nfp_prog->tgt_abort, 0);
wrp_immed(nfp_prog, reg_b(2), 0x44112282);
emit_shf(nfp_prog, reg_a(1),
reg_none(), SHF_OP_NONE, reg_b(0), SHF_SC_L_SHF, 3);
emit_alu(nfp_prog, reg_none(), reg_a(1), ALU_OP_OR, reg_imm(0));
emit_shf(nfp_prog, reg_b(2),
reg_imm(0xff), SHF_OP_AND, reg_b(2), SHF_SC_R_SHF, 0);
emit_br_def(nfp_prog, nfp_prog->tgt_done, 2);
wrp_mov(nfp_prog, reg_a(0), NFP_BPF_ABI_FLAGS);
emit_ld_field(nfp_prog, reg_a(0), 0xc, reg_b(2), SHF_SC_L_SHF, 16);
}
static void nfp_outro(struct nfp_prog *nfp_prog)
{
switch (nfp_prog->act) {
case NN_ACT_DIRECT:
nfp_outro_tc_da(nfp_prog);
break;
case NN_ACT_TC_DROP:
case NN_ACT_TC_REDIR:
nfp_outro_tc_legacy(nfp_prog);
break;
case NN_ACT_XDP:
nfp_outro_xdp(nfp_prog);
break;
}
}
static int nfp_translate(struct nfp_prog *nfp_prog)
{
struct nfp_insn_meta *meta;
int err;
nfp_intro(nfp_prog);
if (nfp_prog->error)
return nfp_prog->error;
list_for_each_entry(meta, &nfp_prog->insns, l) {
instr_cb_t cb = instr_cb[meta->insn.code];
meta->off = nfp_prog_current_offset(nfp_prog);
if (meta->skip) {
nfp_prog->n_translated++;
continue;
}
if (nfp_meta_has_prev(nfp_prog, meta) &&
nfp_meta_prev(meta)->double_cb)
cb = nfp_meta_prev(meta)->double_cb;
if (!cb)
return -ENOENT;
err = cb(nfp_prog, meta);
if (err)
return err;
nfp_prog->n_translated++;
}
nfp_outro(nfp_prog);
if (nfp_prog->error)
return nfp_prog->error;
wrp_nops(nfp_prog, NFP_USTORE_PREFETCH_WINDOW);
if (nfp_prog->error)
return nfp_prog->error;
return nfp_fixup_branches(nfp_prog);
}
static int
nfp_prog_prepare(struct nfp_prog *nfp_prog, const struct bpf_insn *prog,
unsigned int cnt)
{
unsigned int i;
for (i = 0; i < cnt; i++) {
struct nfp_insn_meta *meta;
meta = kzalloc(sizeof(*meta), GFP_KERNEL);
if (!meta)
return -ENOMEM;
meta->insn = prog[i];
meta->n = i;
list_add_tail(&meta->l, &nfp_prog->insns);
}
return 0;
}
/* --- Optimizations --- */
static void nfp_bpf_opt_reg_init(struct nfp_prog *nfp_prog)
{
struct nfp_insn_meta *meta;
list_for_each_entry(meta, &nfp_prog->insns, l) {
struct bpf_insn insn = meta->insn;
/* Programs converted from cBPF start with register xoring */
if (insn.code == (BPF_ALU64 | BPF_XOR | BPF_X) &&
insn.src_reg == insn.dst_reg)
continue;
/* Programs start with R6 = R1 but we ignore the skb pointer */
if (insn.code == (BPF_ALU64 | BPF_MOV | BPF_X) &&
insn.src_reg == 1 && insn.dst_reg == 6)
meta->skip = true;
/* Return as soon as something doesn't match */
if (!meta->skip)
return;
}
}
/* Remove masking after load since our load guarantees this is not needed */
static void nfp_bpf_opt_ld_mask(struct nfp_prog *nfp_prog)
{
struct nfp_insn_meta *meta1, *meta2;
const s32 exp_mask[] = {
[BPF_B] = 0x000000ffU,
[BPF_H] = 0x0000ffffU,
[BPF_W] = 0xffffffffU,
};
nfp_for_each_insn_walk2(nfp_prog, meta1, meta2) {
struct bpf_insn insn, next;
insn = meta1->insn;
next = meta2->insn;
if (BPF_CLASS(insn.code) != BPF_LD)
continue;
if (BPF_MODE(insn.code) != BPF_ABS &&
BPF_MODE(insn.code) != BPF_IND)
continue;
if (next.code != (BPF_ALU64 | BPF_AND | BPF_K))
continue;
if (!exp_mask[BPF_SIZE(insn.code)])
continue;
if (exp_mask[BPF_SIZE(insn.code)] != next.imm)
continue;
if (next.src_reg || next.dst_reg)
continue;
meta2->skip = true;
}
}
static void nfp_bpf_opt_ld_shift(struct nfp_prog *nfp_prog)
{
struct nfp_insn_meta *meta1, *meta2, *meta3;
nfp_for_each_insn_walk3(nfp_prog, meta1, meta2, meta3) {
struct bpf_insn insn, next1, next2;
insn = meta1->insn;
next1 = meta2->insn;
next2 = meta3->insn;
if (BPF_CLASS(insn.code) != BPF_LD)
continue;
if (BPF_MODE(insn.code) != BPF_ABS &&
BPF_MODE(insn.code) != BPF_IND)
continue;
if (BPF_SIZE(insn.code) != BPF_W)
continue;
if (!(next1.code == (BPF_LSH | BPF_K | BPF_ALU64) &&
next2.code == (BPF_RSH | BPF_K | BPF_ALU64)) &&
!(next1.code == (BPF_RSH | BPF_K | BPF_ALU64) &&
next2.code == (BPF_LSH | BPF_K | BPF_ALU64)))
continue;
if (next1.src_reg || next1.dst_reg ||
next2.src_reg || next2.dst_reg)
continue;
if (next1.imm != 0x20 || next2.imm != 0x20)
continue;
meta2->skip = true;
meta3->skip = true;
}
}
static int nfp_bpf_optimize(struct nfp_prog *nfp_prog)
{
nfp_bpf_opt_reg_init(nfp_prog);
nfp_bpf_opt_ld_mask(nfp_prog);
nfp_bpf_opt_ld_shift(nfp_prog);
return 0;
}
static int nfp_bpf_ustore_calc(struct nfp_prog *nfp_prog, __le64 *ustore)
{
int i;
for (i = 0; i < nfp_prog->prog_len; i++) {
int err;
err = nfp_ustore_check_valid_no_ecc(nfp_prog->prog[i]);
if (err)
return err;
nfp_prog->prog[i] = nfp_ustore_calc_ecc_insn(nfp_prog->prog[i]);
ustore[i] = cpu_to_le64(nfp_prog->prog[i]);
}
return 0;
}
/**
* nfp_bpf_jit() - translate BPF code into NFP assembly
* @filter: kernel BPF filter struct
* @prog_mem: memory to store assembler instructions
* @act: action attached to this eBPF program
* @prog_start: offset of the first instruction when loaded
* @prog_done: where to jump on exit
* @prog_sz: size of @prog_mem in instructions
* @res: achieved parameters of translation results
*/
int
nfp_bpf_jit(struct bpf_prog *filter, void *prog_mem,
enum nfp_bpf_action_type act,
unsigned int prog_start, unsigned int prog_done,
unsigned int prog_sz, struct nfp_bpf_result *res)
{
struct nfp_prog *nfp_prog;
int ret;
nfp_prog = kzalloc(sizeof(*nfp_prog), GFP_KERNEL);
if (!nfp_prog)
return -ENOMEM;
INIT_LIST_HEAD(&nfp_prog->insns);
nfp_prog->act = act;
nfp_prog->start_off = prog_start;
nfp_prog->tgt_done = prog_done;
ret = nfp_prog_prepare(nfp_prog, filter->insnsi, filter->len);
if (ret)
goto out;
ret = nfp_prog_verify(nfp_prog, filter);
if (ret)
goto out;
ret = nfp_bpf_optimize(nfp_prog);
if (ret)
goto out;
nfp_prog->num_regs = MAX_BPF_REG;
nfp_prog->regs_per_thread = 32;
nfp_prog->prog = prog_mem;
nfp_prog->__prog_alloc_len = prog_sz;
ret = nfp_translate(nfp_prog);
if (ret) {
pr_err("Translation failed with error %d (translated: %u)\n",
ret, nfp_prog->n_translated);
ret = -EINVAL;
goto out;
}
ret = nfp_bpf_ustore_calc(nfp_prog, (__force __le64 *)prog_mem);
res->n_instr = nfp_prog->prog_len;
res->dense_mode = false;
out:
nfp_prog_free(nfp_prog);
return ret;
}
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