static int netvsc_set_channels(struct net_device *net,
struct ethtool_channels *channels)
{
struct net_device_context *net_device_ctx = netdev_priv(net);
struct hv_device *dev = net_device_ctx->device_ctx;
struct netvsc_device *nvdev = rtnl_dereference(net_device_ctx->nvdev);
unsigned int count = channels->combined_count;
bool was_running;
int ret;
/* We do not support separate count for rx, tx, or other */
if (count == 0 ||
channels->rx_count || channels->tx_count || channels->other_count)
return -EINVAL;
if (count > net->num_tx_queues || count > VRSS_CHANNEL_MAX)
return -EINVAL;
if (!nvdev || nvdev->destroy)
return -ENODEV;
if (nvdev->nvsp_version < NVSP_PROTOCOL_VERSION_5)
return -EINVAL;
if (count > nvdev->max_chn)
return -EINVAL;
was_running = netif_running(net);
if (was_running) {
ret = netvsc_close(net);
if (ret)
return ret;
}
rndis_filter_device_remove(dev, nvdev);
ret = netvsc_set_queues(net, dev, count);
if (ret == 0)
nvdev->num_chn = count;
else
netvsc_set_queues(net, dev, nvdev->num_chn);
if (was_running)
ret = netvsc_open(net);
/* We may have missed link change notifications */
schedule_delayed_work(&net_device_ctx->dwork, 0);
return ret;
}
static int netvsc_change_mtu(struct net_device *ndev, int mtu)
{
struct net_device_context *ndevctx = netdev_priv(ndev);
struct netvsc_device *nvdev = ndevctx->nvdev;
struct hv_device *hdev = ndevctx->device_ctx;
struct netvsc_device_info device_info;
int limit = ETH_DATA_LEN;
u32 num_chn;
int ret = 0;
if (ndevctx->start_remove || !nvdev || nvdev->destroy)
return -ENODEV;
if (nvdev->nvsp_version >= NVSP_PROTOCOL_VERSION_2)
limit = NETVSC_MTU - ETH_HLEN;
if (mtu < NETVSC_MTU_MIN || mtu > limit)
return -EINVAL;
ret = netvsc_close(ndev);
if (ret)
goto out;
num_chn = nvdev->num_chn;
ndevctx->start_remove = true;
rndis_filter_device_remove(hdev);
ndev->mtu = mtu;
memset(&device_info, 0, sizeof(device_info));
device_info.ring_size = ring_size;
device_info.num_chn = num_chn;
device_info.max_num_vrss_chns = max_num_vrss_chns;
rndis_filter_device_add(hdev, &device_info);
out:
netvsc_open(ndev);
ndevctx->start_remove = false;
/* We may have missed link change notifications */
schedule_delayed_work(&ndevctx->dwork, 0);
return ret;
}
static int netvsc_change_mtu(struct net_device *ndev, int mtu)
{
struct net_device_context *ndevctx = netdev_priv(ndev);
struct netvsc_device *nvdev = rtnl_dereference(ndevctx->nvdev);
struct hv_device *hdev = ndevctx->device_ctx;
struct netvsc_device_info device_info;
bool was_running;
int ret = 0;
if (!nvdev || nvdev->destroy)
return -ENODEV;
was_running = netif_running(ndev);
if (was_running) {
ret = netvsc_close(ndev);
if (ret)
return ret;
}
memset(&device_info, 0, sizeof(device_info));
device_info.ring_size = ring_size;
device_info.num_chn = nvdev->num_chn;
device_info.max_num_vrss_chns = nvdev->num_chn;
rndis_filter_device_remove(hdev, nvdev);
/* 'nvdev' has been freed in rndis_filter_device_remove() ->
* netvsc_device_remove () -> free_netvsc_device().
* We mustn't access it before it's re-created in
* rndis_filter_device_add() -> netvsc_device_add().
*/
ndev->mtu = mtu;
rndis_filter_device_add(hdev, &device_info);
if (was_running)
ret = netvsc_open(ndev);
/* We may have missed link change notifications */
schedule_delayed_work(&ndevctx->dwork, 0);
return ret;
}
static int netvsc_change_mtu(struct net_device *ndev, int mtu)
{
struct net_device_context *ndevctx = netdev_priv(ndev);
struct hv_device *hdev = ndevctx->device_ctx;
struct netvsc_device *nvdev = hv_get_drvdata(hdev);
struct netvsc_device_info device_info;
int limit = ETH_DATA_LEN;
int ret = 0;
if (nvdev == NULL || nvdev->destroy)
return -ENODEV;
if (nvdev->nvsp_version >= NVSP_PROTOCOL_VERSION_2)
limit = NETVSC_MTU - ETH_HLEN;
if (mtu < NETVSC_MTU_MIN || mtu > limit)
return -EINVAL;
ret = netvsc_close(ndev);
if (ret)
goto out;
nvdev->start_remove = true;
rndis_filter_device_remove(hdev);
ndev->mtu = mtu;
ndevctx->device_ctx = hdev;
hv_set_drvdata(hdev, ndev);
memset(&device_info, 0, sizeof(device_info));
device_info.ring_size = ring_size;
device_info.num_chn = nvdev->num_chn;
device_info.max_num_vrss_chns = max_num_vrss_chns;
rndis_filter_device_add(hdev, &device_info);
out:
netvsc_open(ndev);
return ret;
}
static int netvsc_set_channels(struct net_device *net,
struct ethtool_channels *channels)
{
struct net_device_context *net_device_ctx = netdev_priv(net);
struct hv_device *dev = net_device_ctx->device_ctx;
struct netvsc_device *nvdev = net_device_ctx->nvdev;
struct netvsc_device_info device_info;
u32 num_chn;
u32 max_chn;
int ret = 0;
bool recovering = false;
if (net_device_ctx->start_remove || !nvdev || nvdev->destroy)
return -ENODEV;
num_chn = nvdev->num_chn;
max_chn = min_t(u32, nvdev->max_chn, num_online_cpus());
if (nvdev->nvsp_version < NVSP_PROTOCOL_VERSION_5) {
pr_info("vRSS unsupported before NVSP Version 5\n");
return -EINVAL;
}
/* We do not support rx, tx, or other */
if (!channels ||
channels->rx_count ||
channels->tx_count ||
channels->other_count ||
(channels->combined_count < 1))
return -EINVAL;
if (channels->combined_count > max_chn) {
pr_info("combined channels too high, using %d\n", max_chn);
channels->combined_count = max_chn;
}
ret = netvsc_close(net);
if (ret)
goto out;
do_set:
net_device_ctx->start_remove = true;
rndis_filter_device_remove(dev);
nvdev->num_chn = channels->combined_count;
memset(&device_info, 0, sizeof(device_info));
device_info.num_chn = nvdev->num_chn; /* passed to RNDIS */
device_info.ring_size = ring_size;
device_info.max_num_vrss_chns = max_num_vrss_chns;
ret = rndis_filter_device_add(dev, &device_info);
if (ret) {
if (recovering) {
netdev_err(net, "unable to add netvsc device (ret %d)\n", ret);
return ret;
}
goto recover;
}
nvdev = net_device_ctx->nvdev;
ret = netif_set_real_num_tx_queues(net, nvdev->num_chn);
if (ret) {
if (recovering) {
netdev_err(net, "could not set tx queue count (ret %d)\n", ret);
return ret;
}
goto recover;
}
ret = netif_set_real_num_rx_queues(net, nvdev->num_chn);
if (ret) {
if (recovering) {
netdev_err(net, "could not set rx queue count (ret %d)\n", ret);
return ret;
}
goto recover;
}
out:
netvsc_open(net);
net_device_ctx->start_remove = false;
/* We may have missed link change notifications */
schedule_delayed_work(&net_device_ctx->dwork, 0);
return ret;
recover:
/* If the above failed, we attempt to recover through the same
* process but with the original number of channels.
*/
netdev_err(net, "could not set channels, recovering\n");
recovering = true;
channels->combined_count = num_chn;
goto do_set;
}