--- /dev/null
+/*
+ * 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 "nfp_asm.h"
+#include "nfp_bpf.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;
+}
+
+/* --- SW reg --- */
+struct nfp_insn_ur_regs {
+ enum alu_dst_ab dst_ab;
+ u16 dst;
+ u16 areg, breg;
+ bool swap;
+ bool wr_both;
+};
+
+struct nfp_insn_re_regs {
+ enum alu_dst_ab dst_ab;
+ u8 dst;
+ u8 areg, breg;
+ bool swap;
+ bool wr_both;
+ bool i8;
+};
+
+static u16 nfp_swreg_to_unreg(u32 swreg, bool is_dst)
+{
+ u16 val = FIELD_GET(NN_REG_VAL, swreg);
+
+ switch (FIELD_GET(NN_REG_TYPE, swreg)) {
+ case NN_REG_GPR_A:
+ case NN_REG_GPR_B:
+ case NN_REG_GPR_BOTH:
+ return val;
+ case NN_REG_NNR:
+ return UR_REG_NN | val;
+ case NN_REG_XFER:
+ return UR_REG_XFR | val;
+ case NN_REG_IMM:
+ if (val & ~0xff) {
+ pr_err("immediate too large\n");
+ return 0;
+ }
+ return UR_REG_IMM_encode(val);
+ case NN_REG_NONE:
+ return is_dst ? UR_REG_NO_DST : REG_NONE;
+ default:
+ pr_err("unrecognized reg encoding %08x\n", swreg);
+ return 0;
+ }
+}
+
+static int
+swreg_to_unrestricted(u32 dst, u32 lreg, u32 rreg, struct nfp_insn_ur_regs *reg)
+{
+ memset(reg, 0, sizeof(*reg));
+
+ /* Decode destination */
+ if (FIELD_GET(NN_REG_TYPE, dst) == NN_REG_IMM)
+ return -EFAULT;
+
+ if (FIELD_GET(NN_REG_TYPE, dst) == NN_REG_GPR_B)
+ reg->dst_ab = ALU_DST_B;
+ if (FIELD_GET(NN_REG_TYPE, dst) == NN_REG_GPR_BOTH)
+ reg->wr_both = true;
+ reg->dst = nfp_swreg_to_unreg(dst, true);
+
+ /* Decode source operands */
+ if (FIELD_GET(NN_REG_TYPE, lreg) == FIELD_GET(NN_REG_TYPE, rreg))
+ return -EFAULT;
+
+ if (FIELD_GET(NN_REG_TYPE, lreg) == NN_REG_GPR_B ||
+ FIELD_GET(NN_REG_TYPE, rreg) == NN_REG_GPR_A) {
+ reg->areg = nfp_swreg_to_unreg(rreg, false);
+ reg->breg = nfp_swreg_to_unreg(lreg, false);
+ reg->swap = true;
+ } else {
+ reg->areg = nfp_swreg_to_unreg(lreg, false);
+ reg->breg = nfp_swreg_to_unreg(rreg, false);
+ }
+
+ return 0;
+}
+
+static u16 nfp_swreg_to_rereg(u32 swreg, bool is_dst, bool has_imm8, bool *i8)
+{
+ u16 val = FIELD_GET(NN_REG_VAL, swreg);
+
+ switch (FIELD_GET(NN_REG_TYPE, swreg)) {
+ case NN_REG_GPR_A:
+ case NN_REG_GPR_B:
+ case NN_REG_GPR_BOTH:
+ return val;
+ case NN_REG_XFER:
+ return RE_REG_XFR | val;
+ case NN_REG_IMM:
+ if (val & ~(0x7f | has_imm8 << 7)) {
+ pr_err("immediate too large\n");
+ return 0;
+ }
+ *i8 = val & 0x80;
+ return RE_REG_IMM_encode(val & 0x7f);
+ case NN_REG_NONE:
+ return is_dst ? RE_REG_NO_DST : REG_NONE;
+ default:
+ pr_err("unrecognized reg encoding\n");
+ return 0;
+ }
+}
+
+static int
+swreg_to_restricted(u32 dst, u32 lreg, u32 rreg, struct nfp_insn_re_regs *reg,
+ bool has_imm8)
+{
+ memset(reg, 0, sizeof(*reg));
+
+ /* Decode destination */
+ if (FIELD_GET(NN_REG_TYPE, dst) == NN_REG_IMM)
+ return -EFAULT;
+
+ if (FIELD_GET(NN_REG_TYPE, dst) == NN_REG_GPR_B)
+ reg->dst_ab = ALU_DST_B;
+ if (FIELD_GET(NN_REG_TYPE, dst) == NN_REG_GPR_BOTH)
+ reg->wr_both = true;
+ reg->dst = nfp_swreg_to_rereg(dst, true, false, NULL);
+
+ /* Decode source operands */
+ if (FIELD_GET(NN_REG_TYPE, lreg) == FIELD_GET(NN_REG_TYPE, rreg))
+ return -EFAULT;
+
+ if (FIELD_GET(NN_REG_TYPE, lreg) == NN_REG_GPR_B ||
+ FIELD_GET(NN_REG_TYPE, rreg) == NN_REG_GPR_A) {
+ reg->areg = nfp_swreg_to_rereg(rreg, false, has_imm8, ®->i8);
+ reg->breg = nfp_swreg_to_rereg(lreg, false, has_imm8, ®->i8);
+ reg->swap = true;
+ } else {
+ reg->areg = nfp_swreg_to_rereg(lreg, false, has_imm8, ®->i8);
+ reg->breg = nfp_swreg_to_rereg(rreg, false, has_imm8, ®->i8);
+ }
+
+ return 0;
+}
+
+/* --- Emitters --- */
+static const struct cmd_tgt_act cmd_tgt_act[__CMD_TGT_MAP_SIZE] = {
+ [CMD_TGT_WRITE8] = { 0x00, 0x42 },
+ [CMD_TGT_READ8] = { 0x01, 0x43 },
+ [CMD_TGT_READ_LE] = { 0x01, 0x40 },
+ [CMD_TGT_READ_SWAP_LE] = { 0x03, 0x40 },
+};
+
+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, u32 lreg, u32 rreg, u8 size, bool sync)
+{
+ struct nfp_insn_re_regs reg;
+ int err;
+
+ err = swreg_to_restricted(reg_none(), lreg, rreg, ®, false);
+ if (err) {
+ nfp_prog->error = err;
+ return;
+ }
+ if (reg.swap) {
+ pr_err("cmd can't swap arguments\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(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)
+{
+ 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);
+
+ nfp_prog_push(nfp_prog, insn);
+}
+
+static void
+emit_br_byte_neq(struct nfp_prog *nfp_prog,
+ u32 dst, u8 imm, u8 byte, u16 addr, u8 defer)
+{
+ struct nfp_insn_re_regs reg;
+ int err;
+
+ err = swreg_to_restricted(reg_none(), dst, reg_imm(imm), ®, true);
+ if (err) {
+ nfp_prog->error = err;
+ return;
+ }
+
+ __emit_br_byte(nfp_prog, reg.areg, reg.breg, reg.i8, byte, false, addr,
+ defer);
+}
+
+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)
+{
+ 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);
+
+ nfp_prog_push(nfp_prog, insn);
+}
+
+static void
+emit_immed(struct nfp_prog *nfp_prog, u32 dst, u16 imm,
+ enum immed_width width, bool invert, enum immed_shift shift)
+{
+ struct nfp_insn_ur_regs reg;
+ int err;
+
+ if (FIELD_GET(NN_REG_TYPE, dst) == NN_REG_IMM) {
+ nfp_prog->error = -EFAULT;
+ return;
+ }
+
+ err = swreg_to_unrestricted(dst, dst, reg_imm(imm & 0xff), ®);
+ if (err) {
+ nfp_prog->error = err;
+ return;
+ }
+
+ __emit_immed(nfp_prog, reg.areg, reg.breg, imm >> 8, width,
+ invert, shift, reg.wr_both);
+}
+
+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)
+{
+ 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);
+
+ nfp_prog_push(nfp_prog, insn);
+}
+
+static void
+emit_shf(struct nfp_prog *nfp_prog, u32 dst, u32 lreg, enum shf_op op, u32 rreg,
+ enum shf_sc sc, u8 shift)
+{
+ struct nfp_insn_re_regs reg;
+ int err;
+
+ err = swreg_to_restricted(dst, lreg, rreg, ®, 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);
+}
+
+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)
+{
+ 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);
+
+ nfp_prog_push(nfp_prog, insn);
+}
+
+static void
+emit_alu(struct nfp_prog *nfp_prog, u32 dst, u32 lreg, enum alu_op op, u32 rreg)
+{
+ struct nfp_insn_ur_regs reg;
+ int err;
+
+ err = swreg_to_unrestricted(dst, lreg, rreg, ®);
+ 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);
+}
+
+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)
+{
+ 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);
+
+ nfp_prog_push(nfp_prog, insn);
+}
+
+static void
+emit_ld_field_any(struct nfp_prog *nfp_prog, enum shf_sc sc, u8 shift,
+ u32 dst, u8 bmask, u32 src, bool zero)
+{
+ struct nfp_insn_re_regs reg;
+ int err;
+
+ err = swreg_to_restricted(reg_none(), dst, src, ®, 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);
+}
+
+static void
+emit_ld_field(struct nfp_prog *nfp_prog, u32 dst, u8 bmask, u32 src,
+ enum shf_sc sc, u8 shift)
+{
+ emit_ld_field_any(nfp_prog, sc, shift, dst, bmask, src, false);
+}
+
+/* --- 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, u32 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 u32 ur_load_imm_any(struct nfp_prog *nfp_prog, u32 imm, u32 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 u32 re_load_imm_any(struct nfp_prog *nfp_prog, u32 imm, u32 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_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_reg_mov(struct nfp_prog *nfp_prog, u16 dst, u16 src)
+{
+ emit_alu(nfp_prog, reg_both(dst), reg_none(), ALU_OP_NONE, reg_b(src));
+}
+
+static int
+construct_data_ind_ld(struct nfp_prog *nfp_prog, u16 offset,
+ u16 src, bool src_valid, u8 size)
+{
+ unsigned int i;
+ u16 shift, sz;
+ u32 tmp_reg;
+
+ /* 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 = size < 4 ? 4 : size;
+ shift = size < 4 ? 4 - size : 0;
+
+ if (src_valid) {
+ /* 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(),
+ NFP_BPF_ABI_LEN, ALU_OP_SUB, imm_a(nfp_prog));
+ wrp_br_special(nfp_prog, BR_BLO, OP_BR_GO_ABORT);
+ /* Load data */
+ emit_cmd(nfp_prog, CMD_TGT_READ8, CMD_MODE_32b, 0,
+ pkt_reg(nfp_prog), imm_b(nfp_prog), sz - 1, true);
+ } else {
+ /* Check packet length */
+ tmp_reg = ur_load_imm_any(nfp_prog, offset + size,
+ imm_a(nfp_prog));
+ emit_alu(nfp_prog, reg_none(),
+ NFP_BPF_ABI_LEN, 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));
+ emit_cmd(nfp_prog, CMD_TGT_READ8, CMD_MODE_32b, 0,
+ pkt_reg(nfp_prog), tmp_reg, sz - 1, true);
+ }
+
+ i = 0;
+ if (shift)
+ emit_shf(nfp_prog, reg_both(0), reg_none(), SHF_OP_NONE,
+ reg_xfer(0), SHF_SC_R_SHF, shift * 8);
+ else
+ for (; i * 4 < size; i++)
+ emit_alu(nfp_prog, reg_both(i),
+ reg_none(), ALU_OP_NONE, reg_xfer(i));
+
+ if (i < 2)
+ wrp_immed(nfp_prog, reg_both(1), 0);
+
+ return 0;
+}
+
+static int construct_data_ld(struct nfp_prog *nfp_prog, u16 offset, u8 size)
+{
+ return construct_data_ind_ld(nfp_prog, offset, 0, false, size);
+}
+
+static void
+wrp_alu_imm(struct nfp_prog *nfp_prog, u8 dst, enum alu_op alu_op, u32 imm)
+{
+ u32 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 -ENOTSUPP;
+
+ 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;
+ u32 tmp_reg;
+
+ if (insn->off < 0) /* TODO */
+ return -ENOTSUPP;
+
+ 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 = insn->src_reg * 2, breg = insn->dst_reg * 2;
+
+ if (insn->off < 0) /* TODO */
+ return -ENOTSUPP;
+
+ 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;
+}
+
+/* --- Callbacks --- */
+static int mov_reg64(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_reg_mov(nfp_prog, insn->dst_reg * 2 + 1, insn->src_reg * 2 + 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;
+
+ if (insn->imm != 32)
+ return 1; /* TODO */
+
+ wrp_reg_mov(nfp_prog, insn->dst_reg * 2 + 1, insn->dst_reg * 2);
+ wrp_immed(nfp_prog, reg_both(insn->dst_reg * 2), 0);
+
+ return 0;
+}
+
+static int shr_imm64(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
+{
+ const struct bpf_insn *insn = &meta->insn;
+
+ if (insn->imm != 32)
+ return 1; /* TODO */
+
+ wrp_reg_mov(nfp_prog, insn->dst_reg * 2, insn->dst_reg * 2 + 1);
+ wrp_immed(nfp_prog, reg_both(insn->dst_reg * 2 + 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 imm_ld8_part2(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
+{
+ wrp_immed(nfp_prog, reg_both(nfp_meta_prev(meta)->insn.dst_reg * 2 + 1),
+ meta->insn.imm);
+
+ return 0;
+}
+
+static int imm_ld8(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
+{
+ const struct bpf_insn *insn = &meta->insn;
+
+ meta->double_cb = imm_ld8_part2;
+ wrp_immed(nfp_prog, reg_both(insn->dst_reg * 2), insn->imm);
+
+ 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, true, 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, true, 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, true, 4);
+}
+
+static int mem_ldx4(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
+{
+ if (meta->insn.off == offsetof(struct sk_buff, len))
+ emit_alu(nfp_prog, reg_both(meta->insn.dst_reg * 2),
+ reg_none(), ALU_OP_NONE, NFP_BPF_ABI_LEN);
+ else
+ return -ENOTSUPP;
+
+ return 0;
+}
+
+static int jump(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
+{
+ if (meta->insn.off < 0) /* TODO */
+ return -ENOTSUPP;
+ 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 */
+ u32 or1 = reg_a(insn->dst_reg * 2), or2 = reg_b(insn->dst_reg * 2 + 1);
+ u32 tmp_reg;
+
+ if (insn->off < 0) /* TODO */
+ return -ENOTSUPP;
+
+ 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, false);
+}
+
+static int jge_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 */
+ u32 tmp_reg;
+
+ if (insn->off < 0) /* TODO */
+ return -ENOTSUPP;
+
+ 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 */
+ u32 tmp_reg;
+
+ if (insn->off < 0) /* TODO */
+ return -ENOTSUPP;
+
+ 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);
+ }
+
+ 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 -ENOTSUPP;
+
+ 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, false);
+}
+
+static int jge_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_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_W] = mem_ldx4,
+ [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_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_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)
+{
+ emit_alu(nfp_prog, pkt_reg(nfp_prog),
+ reg_none(), ALU_OP_NONE, NFP_BPF_ABI_PKT);
+}
+
+static void nfp_outro_tc_legacy(struct nfp_prog *nfp_prog)
+{
+ const u8 act2code[] = {
+ [NN_ACT_TC_DROP] = 0x22,
+ };
+ /* 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);
+ emit_alu(nfp_prog, reg_a(0),
+ reg_none(), ALU_OP_NONE, 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(struct nfp_prog *nfp_prog)
+{
+ switch (nfp_prog->act) {
+ case NN_ACT_TC_DROP:
+ nfp_outro_tc_legacy(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;
+
+ 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;
+ }
+}
+
+/* Try to rename registers so that program uses only low ones */
+static int nfp_bpf_opt_reg_rename(struct nfp_prog *nfp_prog)
+{
+ bool reg_used[MAX_BPF_REG] = {};
+ u8 tgt_reg[MAX_BPF_REG] = {};
+ struct nfp_insn_meta *meta;
+ unsigned int i, j;
+
+ list_for_each_entry(meta, &nfp_prog->insns, l) {
+ if (meta->skip)
+ continue;
+
+ reg_used[meta->insn.src_reg] = true;
+ reg_used[meta->insn.dst_reg] = true;
+ }
+
+ for (i = 0, j = 0; i < ARRAY_SIZE(tgt_reg); i++) {
+ if (!reg_used[i])
+ continue;
+
+ tgt_reg[i] = j++;
+ }
+ nfp_prog->num_regs = j;
+
+ list_for_each_entry(meta, &nfp_prog->insns, l) {
+ meta->insn.src_reg = tgt_reg[meta->insn.src_reg];
+ meta->insn.dst_reg = tgt_reg[meta->insn.dst_reg];
+ }
+
+ return 0;
+}
+
+/* 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)
+{
+ int ret;
+
+ nfp_bpf_opt_reg_init(nfp_prog);
+
+ ret = nfp_bpf_opt_reg_rename(nfp_prog);
+ if (ret)
+ return ret;
+
+ nfp_bpf_opt_ld_mask(nfp_prog);
+ nfp_bpf_opt_ld_shift(nfp_prog);
+
+ 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;
+
+ if (nfp_prog->num_regs <= 7)
+ nfp_prog->regs_per_thread = 16;
+ else
+ 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;
+ }
+
+ res->n_instr = nfp_prog->prog_len;
+ res->dense_mode = nfp_prog->num_regs <= 7;
+out:
+ nfp_prog_free(nfp_prog);
+
+ return ret;
+}
projects / mirror_ubuntu-zesty-kernel.git / commitdiff