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hv_netvsc: don't lose VF information
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struct netvsc_device is not suitable for storing VF information as this
structure is being destroyed on MTU change / set channel operation (see
rndis_filter_device_remove()). Move all VF related stuff to struct
net_device_context which is persistent.

Signed-off-by: Vitaly Kuznetsov <[email protected]>
Acked-by: Haiyang Zhang <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
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@vittyvk @davem330
vittyvk authored and davem330 committed Aug 15, 2016
1 parent 3d7b332 commit f9a7da9
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Showing 3 changed files with 45 additions and 42 deletions.
19 changes: 10 additions & 9 deletions drivers/net/hyperv/hyperv_net.h
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Original file line number Diff line number Diff line change
Expand Up @@ -647,7 +647,7 @@ struct netvsc_reconfig {
struct garp_wrk {
struct work_struct dwrk;
struct net_device *netdev;
struct netvsc_device *netvsc_dev;
struct net_device_context *net_device_ctx;
};

/* The context of the netvsc device */
Expand Down Expand Up @@ -678,6 +678,15 @@ struct net_device_context {

/* the device is going away */
bool start_remove;

/* State to manage the associated VF interface. */
struct net_device *vf_netdev;
bool vf_inject;
atomic_t vf_use_cnt;
/* 1: allocated, serial number is valid. 0: not allocated */
u32 vf_alloc;
/* Serial number of the VF to team with */
u32 vf_serial;
};

/* Per netvsc device */
Expand Down Expand Up @@ -733,15 +742,7 @@ struct netvsc_device {
u32 max_pkt; /* max number of pkt in one send, e.g. 8 */
u32 pkt_align; /* alignment bytes, e.g. 8 */

/* 1: allocated, serial number is valid. 0: not allocated */
u32 vf_alloc;
/* Serial number of the VF to team with */
u32 vf_serial;
atomic_t open_cnt;
/* State to manage the associated VF interface. */
bool vf_inject;
struct net_device *vf_netdev;
atomic_t vf_use_cnt;
};

static inline struct netvsc_device *
Expand Down
19 changes: 8 additions & 11 deletions drivers/net/hyperv/netvsc.c
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Original file line number Diff line number Diff line change
Expand Up @@ -77,13 +77,9 @@ static struct netvsc_device *alloc_net_device(void)
init_waitqueue_head(&net_device->wait_drain);
net_device->destroy = false;
atomic_set(&net_device->open_cnt, 0);
atomic_set(&net_device->vf_use_cnt, 0);
net_device->max_pkt = RNDIS_MAX_PKT_DEFAULT;
net_device->pkt_align = RNDIS_PKT_ALIGN_DEFAULT;

net_device->vf_netdev = NULL;
net_device->vf_inject = false;

return net_device;
}

Expand Down Expand Up @@ -1106,24 +1102,24 @@ static void netvsc_send_table(struct hv_device *hdev,
nvscdev->send_table[i] = tab[i];
}

static void netvsc_send_vf(struct netvsc_device *nvdev,
static void netvsc_send_vf(struct net_device_context *net_device_ctx,
struct nvsp_message *nvmsg)
{
nvdev->vf_alloc = nvmsg->msg.v4_msg.vf_assoc.allocated;
nvdev->vf_serial = nvmsg->msg.v4_msg.vf_assoc.serial;
net_device_ctx->vf_alloc = nvmsg->msg.v4_msg.vf_assoc.allocated;
net_device_ctx->vf_serial = nvmsg->msg.v4_msg.vf_assoc.serial;
}

static inline void netvsc_receive_inband(struct hv_device *hdev,
struct netvsc_device *nvdev,
struct nvsp_message *nvmsg)
struct net_device_context *net_device_ctx,
struct nvsp_message *nvmsg)
{
switch (nvmsg->hdr.msg_type) {
case NVSP_MSG5_TYPE_SEND_INDIRECTION_TABLE:
netvsc_send_table(hdev, nvmsg);
break;

case NVSP_MSG4_TYPE_SEND_VF_ASSOCIATION:
netvsc_send_vf(nvdev, nvmsg);
netvsc_send_vf(net_device_ctx, nvmsg);
break;
}
}
Expand All @@ -1136,6 +1132,7 @@ static void netvsc_process_raw_pkt(struct hv_device *device,
struct vmpacket_descriptor *desc)
{
struct nvsp_message *nvmsg;
struct net_device_context *net_device_ctx = netdev_priv(ndev);

nvmsg = (struct nvsp_message *)((unsigned long)
desc + (desc->offset8 << 3));
Expand All @@ -1150,7 +1147,7 @@ static void netvsc_process_raw_pkt(struct hv_device *device,
break;

case VM_PKT_DATA_INBAND:
netvsc_receive_inband(device, net_device, nvmsg);
netvsc_receive_inband(device, net_device_ctx, nvmsg);
break;

default:
Expand Down
49 changes: 27 additions & 22 deletions drivers/net/hyperv/netvsc_drv.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -658,20 +658,19 @@ int netvsc_recv_callback(struct hv_device *device_obj,
struct sk_buff *skb;
struct sk_buff *vf_skb;
struct netvsc_stats *rx_stats;
struct netvsc_device *netvsc_dev = net_device_ctx->nvdev;
u32 bytes_recvd = packet->total_data_buflen;
int ret = 0;

if (!net || net->reg_state != NETREG_REGISTERED)
return NVSP_STAT_FAIL;

if (READ_ONCE(netvsc_dev->vf_inject)) {
atomic_inc(&netvsc_dev->vf_use_cnt);
if (!READ_ONCE(netvsc_dev->vf_inject)) {
if (READ_ONCE(net_device_ctx->vf_inject)) {
atomic_inc(&net_device_ctx->vf_use_cnt);
if (!READ_ONCE(net_device_ctx->vf_inject)) {
/*
* We raced; just move on.
*/
atomic_dec(&netvsc_dev->vf_use_cnt);
atomic_dec(&net_device_ctx->vf_use_cnt);
goto vf_injection_done;
}

Expand All @@ -683,17 +682,19 @@ int netvsc_recv_callback(struct hv_device *device_obj,
* the host). Deliver these via the VF interface
* in the guest.
*/
vf_skb = netvsc_alloc_recv_skb(netvsc_dev->vf_netdev, packet,
csum_info, *data, vlan_tci);
vf_skb = netvsc_alloc_recv_skb(net_device_ctx->vf_netdev,
packet, csum_info, *data,
vlan_tci);
if (vf_skb != NULL) {
++netvsc_dev->vf_netdev->stats.rx_packets;
netvsc_dev->vf_netdev->stats.rx_bytes += bytes_recvd;
++net_device_ctx->vf_netdev->stats.rx_packets;
net_device_ctx->vf_netdev->stats.rx_bytes +=
bytes_recvd;
netif_receive_skb(vf_skb);
} else {
++net->stats.rx_dropped;
ret = NVSP_STAT_FAIL;
}
atomic_dec(&netvsc_dev->vf_use_cnt);
atomic_dec(&net_device_ctx->vf_use_cnt);
return ret;
}

Expand Down Expand Up @@ -1158,7 +1159,7 @@ static void netvsc_notify_peers(struct work_struct *wrk)

netdev_notify_peers(gwrk->netdev);

atomic_dec(&gwrk->netvsc_dev->vf_use_cnt);
atomic_dec(&gwrk->net_device_ctx->vf_use_cnt);
}

static struct net_device *get_netvsc_net_device(char *mac)
Expand Down Expand Up @@ -1211,7 +1212,7 @@ static int netvsc_register_vf(struct net_device *vf_netdev)
* Take a reference on the module.
*/
try_module_get(THIS_MODULE);
netvsc_dev->vf_netdev = vf_netdev;
net_device_ctx->vf_netdev = vf_netdev;
return NOTIFY_OK;
}

Expand All @@ -1233,11 +1234,11 @@ static int netvsc_vf_up(struct net_device *vf_netdev)
net_device_ctx = netdev_priv(ndev);
netvsc_dev = net_device_ctx->nvdev;

if ((netvsc_dev == NULL) || (netvsc_dev->vf_netdev == NULL))
if (!netvsc_dev || !net_device_ctx->vf_netdev)
return NOTIFY_DONE;

netdev_info(ndev, "VF up: %s\n", vf_netdev->name);
netvsc_dev->vf_inject = true;
net_device_ctx->vf_inject = true;

/*
* Open the device before switching data path.
Expand All @@ -1257,9 +1258,9 @@ static int netvsc_vf_up(struct net_device *vf_netdev)
* notify peers; take a reference to prevent
* the VF interface from vanishing.
*/
atomic_inc(&netvsc_dev->vf_use_cnt);
atomic_inc(&net_device_ctx->vf_use_cnt);
net_device_ctx->gwrk.netdev = vf_netdev;
net_device_ctx->gwrk.netvsc_dev = netvsc_dev;
net_device_ctx->gwrk.net_device_ctx = net_device_ctx;
schedule_work(&net_device_ctx->gwrk.dwrk);

return NOTIFY_OK;
Expand All @@ -1283,17 +1284,17 @@ static int netvsc_vf_down(struct net_device *vf_netdev)
net_device_ctx = netdev_priv(ndev);
netvsc_dev = net_device_ctx->nvdev;

if ((netvsc_dev == NULL) || (netvsc_dev->vf_netdev == NULL))
if (!netvsc_dev || !net_device_ctx->vf_netdev)
return NOTIFY_DONE;

netdev_info(ndev, "VF down: %s\n", vf_netdev->name);
netvsc_dev->vf_inject = false;
net_device_ctx->vf_inject = false;
/*
* Wait for currently active users to
* drain out.
*/

while (atomic_read(&netvsc_dev->vf_use_cnt) != 0)
while (atomic_read(&net_device_ctx->vf_use_cnt) != 0)
udelay(50);
netvsc_switch_datapath(ndev, false);
netdev_info(ndev, "Data path switched from VF: %s\n", vf_netdev->name);
Expand All @@ -1302,9 +1303,9 @@ static int netvsc_vf_down(struct net_device *vf_netdev)
/*
* Notify peers.
*/
atomic_inc(&netvsc_dev->vf_use_cnt);
atomic_inc(&net_device_ctx->vf_use_cnt);
net_device_ctx->gwrk.netdev = ndev;
net_device_ctx->gwrk.netvsc_dev = netvsc_dev;
net_device_ctx->gwrk.net_device_ctx = net_device_ctx;
schedule_work(&net_device_ctx->gwrk.dwrk);

return NOTIFY_OK;
Expand All @@ -1331,7 +1332,7 @@ static int netvsc_unregister_vf(struct net_device *vf_netdev)
return NOTIFY_DONE;
netdev_info(ndev, "VF unregistering: %s\n", vf_netdev->name);

netvsc_dev->vf_netdev = NULL;
net_device_ctx->vf_netdev = NULL;
module_put(THIS_MODULE);
return NOTIFY_OK;
}
Expand Down Expand Up @@ -1382,6 +1383,10 @@ static int netvsc_probe(struct hv_device *dev,
spin_lock_init(&net_device_ctx->lock);
INIT_LIST_HEAD(&net_device_ctx->reconfig_events);

atomic_set(&net_device_ctx->vf_use_cnt, 0);
net_device_ctx->vf_netdev = NULL;
net_device_ctx->vf_inject = false;

net->netdev_ops = &device_ops;

net->hw_features = NETVSC_HW_FEATURES;
Expand Down

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