1 files changed, 148 insertions, 0 deletions
diff --git a/lib/librte_bpf/bpf_load.c b/lib/librte_bpf/bpf_load.c
new file mode 100644
index 00000000..2b84fe72
--- /dev/null
+++ b/lib/librte_bpf/bpf_load.c
@@ -0,0 +1,148 @@
+/* SPDX-License-Identifier: BSD-3-Clause
+ * Copyright(c) 2018 Intel Corporation
+ */
+
+#include <stdarg.h>
+#include <stdio.h>
+#include <string.h>
+#include <errno.h>
+#include <stdint.h>
+#include <unistd.h>
+#include <inttypes.h>
+
+#include <rte_common.h>
+#include <rte_log.h>
+#include <rte_debug.h>
+#include <rte_memory.h>
+#include <rte_eal.h>
+#include <rte_byteorder.h>
+#include <rte_errno.h>
+
+#include "bpf_impl.h"
+
+static struct rte_bpf *
+bpf_load(const struct rte_bpf_prm *prm)
+{
+	uint8_t *buf;
+	struct rte_bpf *bpf;
+	size_t sz, bsz, insz, xsz;
+
+	xsz =  prm->nb_xsym * sizeof(prm->xsym[0]);
+	insz = prm->nb_ins * sizeof(prm->ins[0]);
+	bsz = sizeof(bpf[0]);
+	sz = insz + xsz + bsz;
+
+	buf = mmap(NULL, sz, PROT_READ | PROT_WRITE,
+		MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
+	if (buf == MAP_FAILED)
+		return NULL;
+
+	bpf = (void *)buf;
+	bpf->sz = sz;
+
+	memcpy(&bpf->prm, prm, sizeof(bpf->prm));
+
+	memcpy(buf + bsz, prm->xsym, xsz);
+	memcpy(buf + bsz + xsz, prm->ins, insz);
+
+	bpf->prm.xsym = (void *)(buf + bsz);
+	bpf->prm.ins = (void *)(buf + bsz + xsz);
+
+	return bpf;
+}
+
+/*
+ * Check that user provided external symbol.
+ */
+static int
+bpf_check_xsym(const struct rte_bpf_xsym *xsym)
+{
+	uint32_t i;
+
+	if (xsym->name == NULL)
+		return -EINVAL;
+
+	if (xsym->type == RTE_BPF_XTYPE_VAR) {
+		if (xsym->var.desc.type == RTE_BPF_ARG_UNDEF)
+			return -EINVAL;
+	} else if (xsym->type == RTE_BPF_XTYPE_FUNC) {
+
+		if (xsym->func.nb_args > EBPF_FUNC_MAX_ARGS)
+			return -EINVAL;
+
+		/* check function arguments */
+		for (i = 0; i != xsym->func.nb_args; i++) {
+			if (xsym->func.args[i].type == RTE_BPF_ARG_UNDEF)
+				return -EINVAL;
+		}
+
+		/* check return value info */
+		if (xsym->func.ret.type != RTE_BPF_ARG_UNDEF &&
+				xsym->func.ret.size == 0)
+			return -EINVAL;
+	} else
+		return -EINVAL;
+
+	return 0;
+}
+
+__rte_experimental struct rte_bpf *
+rte_bpf_load(const struct rte_bpf_prm *prm)
+{
+	struct rte_bpf *bpf;
+	int32_t rc;
+	uint32_t i;
+
+	if (prm == NULL || prm->ins == NULL ||
+			(prm->nb_xsym != 0 && prm->xsym == NULL)) {
+		rte_errno = EINVAL;
+		return NULL;
+	}
+
+	rc = 0;
+	for (i = 0; i != prm->nb_xsym && rc == 0; i++)
+		rc = bpf_check_xsym(prm->xsym + i);
+
+	if (rc != 0) {
+		rte_errno = -rc;
+		RTE_BPF_LOG(ERR, "%s: %d-th xsym is invalid\n", __func__, i);
+		return NULL;
+	}
+
+	bpf = bpf_load(prm);
+	if (bpf == NULL) {
+		rte_errno = ENOMEM;
+		return NULL;
+	}
+
+	rc = bpf_validate(bpf);
+	if (rc == 0) {
+		bpf_jit(bpf);
+		if (mprotect(bpf, bpf->sz, PROT_READ) != 0)
+			rc = -ENOMEM;
+	}
+
+	if (rc != 0) {
+		rte_bpf_destroy(bpf);
+		rte_errno = -rc;
+		return NULL;
+	}
+
+	return bpf;
+}
+
+__rte_experimental __attribute__ ((weak)) struct rte_bpf *
+rte_bpf_elf_load(const struct rte_bpf_prm *prm, const char *fname,
+	const char *sname)
+{
+	if (prm == NULL || fname == NULL || sname == NULL) {
+		rte_errno = EINVAL;
+		return NULL;
+	}
+
+	RTE_BPF_LOG(ERR, "%s() is not supported with current config\n"
+		"rebuild with libelf installed\n",
+		__func__);
+	rte_errno = ENOTSUP;
+	return NULL;
+}