Function bpf_load

dpdk/lib/bpf/bpf_load.c:15–45

#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));

	if (xsz > 0)
		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.