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virtio: fix ring size negotiation

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Negotiate the virtio ring size. The host may allow for very large
rings but application may only want a smaller ring.
Conversely, if the number of descriptors requested exceeds the virtio
host queue size, then just silently use the smaller host size.

This fixes issues with virtio in non-QEMU envirionments.
For example Google Compute Engine allows up to 16K elements
in ring.

Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
Acked-by: Changchun Ouyang <changchun.ouyang@intel.com>
This commit is contained in:
Stephen Hemminger 2015-06-11 08:53:27 -07:00 committed by Thomas Monjalon
parent 4a92b67151
commit d78deadae4
1 changed files with 13 additions and 5 deletions
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18
drivers/net/virtio/virtio_ethdev.c
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@ -267,13 +267,21 @@ int virtio_dev_queue_setup(struct rte_eth_dev *dev,
if (vq_size == 0) {
PMD_INIT_LOG(ERR, "%s: virtqueue does not exist", __func__);
return -EINVAL;
} else if (!rte_is_power_of_2(vq_size)) {
}
if (!rte_is_power_of_2(vq_size)) {
PMD_INIT_LOG(ERR, "%s: virtqueue size is not powerof 2", __func__);
return -EINVAL;
} else if (nb_desc != vq_size) {
PMD_INIT_LOG(ERR, "Warning: nb_desc(%d) is not equal to vq size (%d), fall to vq size",
nb_desc, vq_size);
nb_desc = vq_size;
}
if (nb_desc < vq_size) {
if (!rte_is_power_of_2(nb_desc)) {
PMD_INIT_LOG(ERR,
"nb_desc(%u) size is not powerof 2",
nb_desc);
return -EINVAL;
}
vq_size = nb_desc;
}
if (queue_type == VTNET_RQ) {