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netvsc: handle select_queue when device is being removed

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Move the send indirection table from the inner device (netvsc)
to the network device context.

It is possible that netvsc_device is not present (remove in progress).
This solves potential use after free issues when packet is being
created during MTU change, shutdown, or queue count changes.

Fixes: d8e18ee0fa ("netvsc: enhance transmit select_queue")
Signed-off-by: Stephen Hemminger <sthemmin@microsoft.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
stephen hemminger 2017-03-09 14:58:29 -08:00 committed by David S. Miller
parent ecd052250b
commit 7ce1012466
3 changed files with 7 additions and 15 deletions
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3
drivers/net/hyperv/hyperv_net.h
View File

@ -700,6 +700,8 @@ struct net_device_context {
u32 tx_checksum_mask;
u32 tx_send_table[VRSS_SEND_TAB_SIZE];
/* Ethtool settings */
u8 duplex;
u32 speed;
@ -757,7 +759,6 @@ struct netvsc_device {
struct nvsp_message revoke_packet;
u32 send_table[VRSS_SEND_TAB_SIZE];
u32 max_chn;
u32 num_chn;
spinlock_t sc_lock; /* Protects num_sc_offered variable */

8
drivers/net/hyperv/netvsc.c
View File

@ -1136,15 +1136,11 @@ static void netvsc_receive(struct net_device *ndev,
static void netvsc_send_table(struct hv_device *hdev,
struct nvsp_message *nvmsg)
{
struct netvsc_device *nvscdev;
struct net_device *ndev = hv_get_drvdata(hdev);
struct net_device_context *net_device_ctx = netdev_priv(ndev);
int i;
u32 count, *tab;
nvscdev = get_outbound_net_device(hdev);
if (!nvscdev)
return;
count = nvmsg->msg.v5_msg.send_table.count;
if (count != VRSS_SEND_TAB_SIZE) {
netdev_err(ndev, "Received wrong send-table size:%u\n", count);
@ -1155,7 +1151,7 @@ static void netvsc_send_table(struct hv_device *hdev,
nvmsg->msg.v5_msg.send_table.offset);
for (i = 0; i < count; i++)
nvscdev->send_table[i] = tab[i];
net_device_ctx->tx_send_table[i] = tab[i];
}
static void netvsc_send_vf(struct net_device_context *net_device_ctx,

11
drivers/net/hyperv/netvsc_drv.c
View File

@ -206,17 +206,15 @@ static u16 netvsc_select_queue(struct net_device *ndev, struct sk_buff *skb,
void *accel_priv, select_queue_fallback_t fallback)
{
struct net_device_context *net_device_ctx = netdev_priv(ndev);
struct netvsc_device *nvsc_dev = net_device_ctx->nvdev;
unsigned int num_tx_queues = ndev->real_num_tx_queues;
struct sock *sk = skb->sk;
int q_idx = sk_tx_queue_get(sk);
if (q_idx < 0 || skb->ooo_okay ||
q_idx >= ndev->real_num_tx_queues) {
if (q_idx < 0 || skb->ooo_okay || q_idx >= num_tx_queues) {
u16 hash = __skb_tx_hash(ndev, skb, VRSS_SEND_TAB_SIZE);
int new_idx;
new_idx = nvsc_dev->send_table[hash]
% nvsc_dev->num_chn;
new_idx = net_device_ctx->tx_send_table[hash] % num_tx_queues;
if (q_idx != new_idx && sk &&
sk_fullsock(sk) && rcu_access_pointer(sk->sk_dst_cache))
@ -225,9 +223,6 @@ static u16 netvsc_select_queue(struct net_device *ndev, struct sk_buff *skb,
q_idx = new_idx;
}
if (unlikely(!nvsc_dev->chan_table[q_idx].channel))
q_idx = 0;
return q_idx;
}