--- /dev/null
+/*
+ * Copyright (C) 2017 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.
+ */
+
+#ifndef NFP_BPF_FW_H
+#define NFP_BPF_FW_H 1
+
+#include <linux/bitops.h>
+#include <linux/types.h>
+
+enum bpf_cap_tlv_type {
+ NFP_BPF_CAP_TYPE_ADJUST_HEAD = 2,
+};
+
+struct nfp_bpf_cap_tlv_adjust_head {
+ __le32 flags;
+ __le32 off_min;
+ __le32 off_max;
+ __le32 guaranteed_sub;
+ __le32 guaranteed_add;
+};
+
+#define NFP_BPF_ADJUST_HEAD_NO_META BIT(0)
+
+#endif
#define pr_fmt(fmt) "NFP net bpf: " fmt
+#include <linux/bug.h>
#include <linux/kernel.h>
#include <linux/bpf.h>
#include <linux/filter.h>
return nfp_prog->start_off + nfp_prog->prog_len;
}
+static bool
+nfp_prog_confirm_current_offset(struct nfp_prog *nfp_prog, unsigned int off)
+{
+ /* If there is a recorded error we may have dropped instructions;
+ * that doesn't have to be due to translator bug, and the translation
+ * will fail anyway, so just return OK.
+ */
+ if (nfp_prog->error)
+ return true;
+ return !WARN_ON_ONCE(nfp_prog_current_offset(nfp_prog) != off);
+}
+
static unsigned int
nfp_prog_offset_to_index(struct nfp_prog *nfp_prog, unsigned int offset)
{
SHF_SC_R_ROT, 16);
}
+static int adjust_head(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
+{
+ swreg tmp = imm_a(nfp_prog), tmp_len = imm_b(nfp_prog);
+ struct nfp_bpf_cap_adjust_head *adjust_head;
+ u32 ret_einval, end;
+
+ adjust_head = &nfp_prog->bpf->adjust_head;
+
+ ret_einval = nfp_prog_current_offset(nfp_prog) + 14;
+ end = ret_einval + 2;
+
+ /* We need to use a temp because offset is just a part of the pkt ptr */
+ emit_alu(nfp_prog, tmp,
+ reg_a(2 * 2), ALU_OP_ADD_2B, pptr_reg(nfp_prog));
+
+ /* Validate result will fit within FW datapath constraints */
+ emit_alu(nfp_prog, reg_none(),
+ tmp, ALU_OP_SUB, reg_imm(adjust_head->off_min));
+ emit_br(nfp_prog, BR_BLO, ret_einval, 0);
+ emit_alu(nfp_prog, reg_none(),
+ reg_imm(adjust_head->off_max), ALU_OP_SUB, tmp);
+ emit_br(nfp_prog, BR_BLO, ret_einval, 0);
+
+ /* Validate the length is at least ETH_HLEN */
+ emit_alu(nfp_prog, tmp_len,
+ plen_reg(nfp_prog), ALU_OP_SUB, reg_a(2 * 2));
+ emit_alu(nfp_prog, reg_none(),
+ tmp_len, ALU_OP_SUB, reg_imm(ETH_HLEN));
+ emit_br(nfp_prog, BR_BMI, ret_einval, 0);
+
+ /* Load the ret code */
+ wrp_immed(nfp_prog, reg_both(0), 0);
+ wrp_immed(nfp_prog, reg_both(1), 0);
+
+ /* Modify the packet metadata */
+ emit_ld_field(nfp_prog, pptr_reg(nfp_prog), 0x3, tmp, SHF_SC_NONE, 0);
+
+ /* Skip over the -EINVAL ret code (defer 2) */
+ emit_br_def(nfp_prog, end, 2);
+
+ emit_alu(nfp_prog, plen_reg(nfp_prog),
+ plen_reg(nfp_prog), ALU_OP_SUB, reg_a(2 * 2));
+ emit_alu(nfp_prog, pv_len(nfp_prog),
+ pv_len(nfp_prog), ALU_OP_SUB, reg_a(2 * 2));
+
+ /* return -EINVAL target */
+ if (!nfp_prog_confirm_current_offset(nfp_prog, ret_einval))
+ return -EINVAL;
+
+ wrp_immed(nfp_prog, reg_both(0), -22);
+ wrp_immed(nfp_prog, reg_both(1), ~0);
+
+ if (!nfp_prog_confirm_current_offset(nfp_prog, end))
+ return -EINVAL;
+
+ return 0;
+}
+
/* --- Callbacks --- */
static int mov_reg64(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
{
static int call(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta)
{
switch (meta->insn.imm) {
+ case BPF_FUNC_xdp_adjust_head:
+ return adjust_head(nfp_prog, meta);
default:
WARN_ONCE(1, "verifier allowed unsupported function\n");
return -EOPNOTSUPP;
#include "../nfp_main.h"
#include "../nfp_net.h"
#include "../nfp_port.h"
+#include "fw.h"
#include "main.h"
static bool nfp_net_ebpf_capable(struct nfp_net *nn)
return nn->dp.ctrl & NFP_NET_CFG_CTRL_BPF;
}
+static int
+nfp_bpf_parse_cap_adjust_head(struct nfp_app_bpf *bpf, void __iomem *value,
+ u32 length)
+{
+ struct nfp_bpf_cap_tlv_adjust_head __iomem *cap = value;
+ struct nfp_cpp *cpp = bpf->app->pf->cpp;
+
+ if (length < sizeof(*cap)) {
+ nfp_err(cpp, "truncated adjust_head TLV: %d\n", length);
+ return -EINVAL;
+ }
+
+ bpf->adjust_head.flags = readl(&cap->flags);
+ bpf->adjust_head.off_min = readl(&cap->off_min);
+ bpf->adjust_head.off_max = readl(&cap->off_max);
+
+ if (bpf->adjust_head.off_min > bpf->adjust_head.off_max) {
+ nfp_err(cpp, "invalid adjust_head TLV: min > max\n");
+ return -EINVAL;
+ }
+ if (!FIELD_FIT(UR_REG_IMM_MAX, bpf->adjust_head.off_min) ||
+ !FIELD_FIT(UR_REG_IMM_MAX, bpf->adjust_head.off_max)) {
+ nfp_warn(cpp, "disabling adjust_head - driver expects min/max to fit in as immediates\n");
+ memset(&bpf->adjust_head, 0, sizeof(bpf->adjust_head));
+ return 0;
+ }
+
+ return 0;
+}
+
static int nfp_bpf_parse_capabilities(struct nfp_app *app)
{
struct nfp_cpp *cpp = app->pf->cpp;
start = mem;
while (mem - start + 8 < nfp_cpp_area_size(area)) {
+ u8 __iomem *value;
u32 type, length;
type = readl(mem);
length = readl(mem + 4);
+ value = mem + 8;
mem += 8 + length;
if (mem - start > nfp_cpp_area_size(area))
goto err_release_free;
switch (type) {
+ case NFP_BPF_CAP_TYPE_ADJUST_HEAD:
+ if (nfp_bpf_parse_cap_adjust_head(app->priv, value,
+ length))
+ goto err_release_free;
+ break;
default:
nfp_dbg(cpp, "unknown BPF capability: %d\n", type);
break;
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