f-stack/dpdk/examples/bpf/t2.c

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/* SPDX-License-Identifier: BSD-3-Clause
* Copyright(c) 2018 Intel Corporation
*/
/*
* eBPF program sample.
* Accepts pointer to struct rte_mbuf as an input parameter.
* cleanup mbuf's vlan_tci and all related RX flags
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* (RTE_MBUF_F_RX_VLAN_PKT | RTE_MBUF_F_RX_VLAN_STRIPPED).
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* Doesn't touch contents of packet data.
* To compile:
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* clang -O2 -target bpf -Wno-int-to-void-pointer-cast -c t2.c
*
* NOTE: if DPDK is not installed system-wide, add compiler flag with path
* to DPDK rte_mbuf.h file, e.g. "clang -I/path/to/dpdk/headers -O2 ..."
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*/
#include <stdint.h>
#include <stddef.h>
#include <rte_config.h>
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#include <rte_mbuf_core.h>
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uint64_t
entry(void *pkt)
{
struct rte_mbuf *mb;
mb = pkt;
mb->vlan_tci = 0;
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mb->ol_flags &= ~(RTE_MBUF_F_RX_VLAN | RTE_MBUF_F_RX_VLAN_STRIPPED);
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return 1;
}