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ether: add soft vlan encap/decap

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It is helpful to allow device drivers that don't support hardware
VLAN stripping to emulate this in software. This allows application
to be device independent.

Avoid discarding shared mbufs. Make a copy in rte_vlan_insert() of any
packet to be tagged that has a reference count > 1.

Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
Signed-off-by: Changchun Ouyang <changchun.ouyang@intel.com>
Acked-by: Huawei Xie <huawei.xie@intel.com>
This commit is contained in:
Stephen Hemminger 2015-02-09 09:13:54 +08:00 committed by Thomas Monjalon
parent 9ffd50826f
commit c974021a59
1 changed files with 76 additions and 0 deletions
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76
lib/librte_ether/rte_ether.h
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@ -49,6 +49,8 @@ extern "C" {
#include <rte_memcpy.h>
#include <rte_random.h>
#include <rte_mbuf.h>
#include <rte_byteorder.h>
#define ETHER_ADDR_LEN 6 /**< Length of Ethernet address. */
#define ETHER_TYPE_LEN 2 /**< Length of Ethernet type field. */
@ -333,6 +335,80 @@ struct vxlan_hdr {
#define ETHER_VXLAN_HLEN (sizeof(struct udp_hdr) + sizeof(struct vxlan_hdr))
/**< VXLAN tunnel header length. */
/**
* Extract VLAN tag information into mbuf
*
* Software version of VLAN stripping
*
* @param m
* The packet mbuf.
* @return
* - 0: Success
* - 1: not a vlan packet
*/
static inline int rte_vlan_strip(struct rte_mbuf *m)
{
struct ether_hdr *eh
= rte_pktmbuf_mtod(m, struct ether_hdr *);
if (eh->ether_type != rte_cpu_to_be_16(ETHER_TYPE_VLAN))
return -1;
struct vlan_hdr *vh = (struct vlan_hdr *)(eh + 1);
m->ol_flags |= PKT_RX_VLAN_PKT;
m->vlan_tci = rte_be_to_cpu_16(vh->vlan_tci);
/* Copy ether header over rather than moving whole packet */
memmove(rte_pktmbuf_adj(m, sizeof(struct vlan_hdr)),
eh, 2 * ETHER_ADDR_LEN);
return 0;
}
/**
* Insert VLAN tag into mbuf.
*
* Software version of VLAN unstripping
*
* @param m
* The packet mbuf.
* @return
* - 0: On success
* -EPERM: mbuf is is shared overwriting would be unsafe
* -ENOSPC: not enough headroom in mbuf
*/
static inline int rte_vlan_insert(struct rte_mbuf **m)
{
struct ether_hdr *oh, *nh;
struct vlan_hdr *vh;
#ifdef RTE_MBUF_REFCNT
/* Can't insert header if mbuf is shared */
if (rte_mbuf_refcnt_read(*m) > 1) {
struct rte_mbuf *copy;
copy = rte_pktmbuf_clone(*m, (*m)->pool);
if (unlikely(copy == NULL))
return -ENOMEM;
rte_pktmbuf_free(*m);
*m = copy;
}
#endif
oh = rte_pktmbuf_mtod(*m, struct ether_hdr *);
nh = (struct ether_hdr *)
rte_pktmbuf_prepend(*m, sizeof(struct vlan_hdr));
if (nh == NULL)
return -ENOSPC;
memmove(nh, oh, 2 * ETHER_ADDR_LEN);
nh->ether_type = rte_cpu_to_be_16(ETHER_TYPE_VLAN);
vh = (struct vlan_hdr *) (nh + 1);
vh->vlan_tci = rte_cpu_to_be_16((*m)->vlan_tci);
return 0;
}
#ifdef __cplusplus
}
#endif