New upstream version 18.08

[deb_dpdk.git] / lib / librte_bpf / bpf_load.c

diff --git a/lib/librte_bpf/bpf_load.c b/lib/librte_bpf/bpf_load.c
new file mode 100644 (file)
index 0000000..2b84fe7
--- /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;
+}