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examples/vhost: avoid inserting vlan twice

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Check if it has already been vlan-tagged packet, if true, avoid inserting a
duplicated vlan tag into it.

This is a possible case when guest has the capability of inserting vlan tag.

Signed-off-by: Changchun Ouyang <changchun.ouyang@intel.com>
Acked-by: Huawei Xie <huawei.xie@intel.com>
This commit is contained in:
Ouyang Changchun 2015-02-09 09:14:09 +08:00 committed by Thomas Monjalon
parent 894bb9cb0e
commit 8b9bb988f7
1 changed files with 28 additions and 17 deletions
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45
examples/vhost/main.c
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@ -1115,6 +1115,7 @@ virtio_tx_route(struct vhost_dev *vdev, struct rte_mbuf *m, uint16_t vlan_tag)
unsigned len, ret, offset = 0;
const uint16_t lcore_id = rte_lcore_id();
struct virtio_net *dev = vdev->dev;
struct ether_hdr *nh;
/*check if destination is local VM*/
if ((vm2vm_mode == VM2VM_SOFTWARE) && (virtio_tx_local(vdev, m) == 0)) {
@ -1135,28 +1136,38 @@ virtio_tx_route(struct vhost_dev *vdev, struct rte_mbuf *m, uint16_t vlan_tag)
tx_q = &lcore_tx_queue[lcore_id];
len = tx_q->len;
m->ol_flags = PKT_TX_VLAN_PKT;
nh = rte_pktmbuf_mtod(m, struct ether_hdr *);
if (unlikely(nh->ether_type == rte_cpu_to_be_16(ETHER_TYPE_VLAN))) {
/* Guest has inserted the vlan tag. */
struct vlan_hdr *vh = (struct vlan_hdr *) (nh + 1);
uint16_t vlan_tag_be = rte_cpu_to_be_16(vlan_tag);
if ((vm2vm_mode == VM2VM_HARDWARE) &&
(vh->vlan_tci != vlan_tag_be))
vh->vlan_tci = vlan_tag_be;
} else {
m->ol_flags = PKT_TX_VLAN_PKT;
/*
* Find the right seg to adjust the data len when offset is
* bigger than tail room size.
*/
if (unlikely(vm2vm_mode == VM2VM_HARDWARE)) {
if (likely(offset <= rte_pktmbuf_tailroom(m)))
m->data_len += offset;
else {
struct rte_mbuf *seg = m;
/*
* Find the right seg to adjust the data len when offset is
* bigger than tail room size.
*/
if (unlikely(vm2vm_mode == VM2VM_HARDWARE)) {
if (likely(offset <= rte_pktmbuf_tailroom(m)))
m->data_len += offset;
else {
struct rte_mbuf *seg = m;
while ((seg->next != NULL) &&
(offset > rte_pktmbuf_tailroom(seg)))
seg = seg->next;
while ((seg->next != NULL) &&
(offset > rte_pktmbuf_tailroom(seg)))
seg = seg->next;
seg->data_len += offset;
seg->data_len += offset;
}
m->pkt_len += offset;
}
m->pkt_len += offset;
}
m->vlan_tci = vlan_tag;
m->vlan_tci = vlan_tag;
}
tx_q->m_table[len] = m;
len++;