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hv_netvsc: preserve hw_features on mtu/channels/ringparam changes 

rndis_filter_device_add() is called both from netvsc_probe() when we
initially create the device and from set channels/mtu/ringparam
routines where we basically remove the device and add it back.

hw_features is reset in rndis_filter_device_add() and filled with
host data. However, we lose all additional flags which are set outside
of the driver, e.g. register_netdevice() adds NETIF_F_SOFT_FEATURES and
many others.

Unfortunately, calls to rndis_{query_hwcaps(), _set_offload_params()}
calls cannot be avoided on every RNDIS reset: host expects us to set
required features explicitly. Moreover, in theory hardware capabilities
can change and we need to reflect the change in hw_features.

Reset net->hw_features bits according to host data in
rndis_netdev_set_hwcaps(), clear corresponding feature bits
from net->features in case some features went missing (will never happen
in real life I guess but let's be consistent).

Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Reviewed-by: Haiyang Zhang <haiyangz@microsoft.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Vitaly Kuznetsov 2017-11-15 15:12:55 +01:00 committed by David S. Miller
parent c61a75ac1a
commit aefd80e874
3 changed files with 83 additions and 59 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
drivers/net/hyperv/hyperv_net.h
View File

@ -646,6 +646,10 @@ struct nvsp_message {
#define NETVSC_RECEIVE_BUFFER_ID 0xcafe
#define NETVSC_SEND_BUFFER_ID 0
#define NETVSC_SUPPORTED_HW_FEATURES (NETIF_F_RXCSUM | NETIF_F_IP_CSUM | \
NETIF_F_TSO | NETIF_F_IPV6_CSUM | \
NETIF_F_TSO6)
#define VRSS_SEND_TAB_SIZE 16 /* must be power of 2 */
#define VRSS_CHANNEL_MAX 64
#define VRSS_CHANNEL_DEFAULT 8

2
drivers/net/hyperv/netvsc_drv.c
View File

@ -2011,7 +2011,7 @@ static int netvsc_probe(struct hv_device *dev,
memcpy(net->dev_addr, device_info.mac_adr, ETH_ALEN);
/* hw_features computed in rndis_filter_device_add */
/* hw_features computed in rndis_netdev_set_hwcaps() */
net->features = net->hw_features |
NETIF_F_HIGHDMA | NETIF_F_SG |
NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_CTAG_RX;

136
drivers/net/hyperv/rndis_filter.c
View File

@ -1131,69 +1131,20 @@ unlock:
rtnl_unlock();
}
struct netvsc_device *rndis_filter_device_add(struct hv_device *dev,
struct netvsc_device_info *device_info)
static int rndis_netdev_set_hwcaps(struct rndis_device *rndis_device,
struct netvsc_device *nvdev)
{
struct net_device *net = hv_get_drvdata(dev);
struct net_device *net = rndis_device->ndev;
struct net_device_context *net_device_ctx = netdev_priv(net);
struct netvsc_device *net_device;
struct rndis_device *rndis_device;
struct ndis_offload hwcaps;
struct ndis_offload_params offloads;
struct ndis_recv_scale_cap rsscap;
u32 rsscap_size = sizeof(struct ndis_recv_scale_cap);
unsigned int gso_max_size = GSO_MAX_SIZE;
u32 mtu, size;
const struct cpumask *node_cpu_mask;
u32 num_possible_rss_qs;
int i, ret;
rndis_device = get_rndis_device();
if (!rndis_device)
return ERR_PTR(-ENODEV);
/*
* Let the inner driver handle this first to create the netvsc channel
* NOTE! Once the channel is created, we may get a receive callback
* (RndisFilterOnReceive()) before this call is completed
*/
net_device = netvsc_device_add(dev, device_info);
if (IS_ERR(net_device)) {
kfree(rndis_device);
return net_device;
}
/* Initialize the rndis device */
net_device->max_chn = 1;
net_device->num_chn = 1;
net_device->extension = rndis_device;
rndis_device->ndev = net;
/* Send the rndis initialization message */
ret = rndis_filter_init_device(rndis_device, net_device);
if (ret != 0)
goto err_dev_remv;
/* Get the MTU from the host */
size = sizeof(u32);
ret = rndis_filter_query_device(rndis_device, net_device,
RNDIS_OID_GEN_MAXIMUM_FRAME_SIZE,
&mtu, &size);
if (ret == 0 && size == sizeof(u32) && mtu < net->mtu)
net->mtu = mtu;
/* Get the mac address */
ret = rndis_filter_query_device_mac(rndis_device, net_device);
if (ret != 0)
goto err_dev_remv;
memcpy(device_info->mac_adr, rndis_device->hw_mac_adr, ETH_ALEN);
int ret;
/* Find HW offload capabilities */
ret = rndis_query_hwcaps(rndis_device, net_device, &hwcaps);
ret = rndis_query_hwcaps(rndis_device, nvdev, &hwcaps);
if (ret != 0)
goto err_dev_remv;
return ret;
/* A value of zero means "no change"; now turn on what we want. */
memset(&offloads, 0, sizeof(struct ndis_offload_params));
@ -1201,8 +1152,12 @@ struct netvsc_device *rndis_filter_device_add(struct hv_device *dev,
/* Linux does not care about IP checksum, always does in kernel */
offloads.ip_v4_csum = NDIS_OFFLOAD_PARAMETERS_TX_RX_DISABLED;
/* Reset previously set hw_features flags */
net->hw_features &= ~NETVSC_SUPPORTED_HW_FEATURES;
net_device_ctx->tx_checksum_mask = 0;
/* Compute tx offload settings based on hw capabilities */
net->hw_features = NETIF_F_RXCSUM;
net->hw_features |= NETIF_F_RXCSUM;
if ((hwcaps.csum.ip4_txcsum & NDIS_TXCSUM_ALL_TCP4) == NDIS_TXCSUM_ALL_TCP4) {
/* Can checksum TCP */
@ -1246,10 +1201,75 @@ struct netvsc_device *rndis_filter_device_add(struct hv_device *dev,
}
}
/* In case some hw_features disappeared we need to remove them from
* net->features list as they're no longer supported.
*/
net->features &= ~NETVSC_SUPPORTED_HW_FEATURES | net->hw_features;
netif_set_gso_max_size(net, gso_max_size);
ret = rndis_filter_set_offload_params(net, net_device, &offloads);
if (ret)
ret = rndis_filter_set_offload_params(net, nvdev, &offloads);
return ret;
}
struct netvsc_device *rndis_filter_device_add(struct hv_device *dev,
struct netvsc_device_info *device_info)
{
struct net_device *net = hv_get_drvdata(dev);
struct netvsc_device *net_device;
struct rndis_device *rndis_device;
struct ndis_recv_scale_cap rsscap;
u32 rsscap_size = sizeof(struct ndis_recv_scale_cap);
u32 mtu, size;
const struct cpumask *node_cpu_mask;
u32 num_possible_rss_qs;
int i, ret;
rndis_device = get_rndis_device();
if (!rndis_device)
return ERR_PTR(-ENODEV);
/* Let the inner driver handle this first to create the netvsc channel
* NOTE! Once the channel is created, we may get a receive callback
* (RndisFilterOnReceive()) before this call is completed
*/
net_device = netvsc_device_add(dev, device_info);
if (IS_ERR(net_device)) {
kfree(rndis_device);
return net_device;
}
/* Initialize the rndis device */
net_device->max_chn = 1;
net_device->num_chn = 1;
net_device->extension = rndis_device;
rndis_device->ndev = net;
/* Send the rndis initialization message */
ret = rndis_filter_init_device(rndis_device, net_device);
if (ret != 0)
goto err_dev_remv;
/* Get the MTU from the host */
size = sizeof(u32);
ret = rndis_filter_query_device(rndis_device, net_device,
RNDIS_OID_GEN_MAXIMUM_FRAME_SIZE,
&mtu, &size);
if (ret == 0 && size == sizeof(u32) && mtu < net->mtu)
net->mtu = mtu;
/* Get the mac address */
ret = rndis_filter_query_device_mac(rndis_device, net_device);
if (ret != 0)
goto err_dev_remv;
memcpy(device_info->mac_adr, rndis_device->hw_mac_adr, ETH_ALEN);
/* Query and set hardware capabilities */
ret = rndis_netdev_set_hwcaps(rndis_device, net_device);
if (ret != 0)
goto err_dev_remv;
rndis_filter_query_device_link_status(rndis_device, net_device);