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hv_netvsc: remove locking in netvsc_send()

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Packet scheduler guarantees there won't be multiple senders for the same
queue and as we use q_idx for multi_send_data the spinlock is redundant.

Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Vitaly Kuznetsov 2015-12-01 16:43:12 -08:00 committed by David S. Miller
parent 8b9fbe1ac3
commit 2a04ae8acb
2 changed files with 0 additions and 9 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

1
drivers/net/hyperv/hyperv_net.h
View file

@ -632,7 +632,6 @@ struct nvsp_message {
#define RNDIS_PKT_ALIGN_DEFAULT 8
struct multi_send_data {
spinlock_t lock; /* protect struct multi_send_data */
struct hv_netvsc_packet *pkt; /* netvsc pkt pending */
u32 count; /* counter of batched packets */
};

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

@ -38,7 +38,6 @@ static struct netvsc_device *alloc_net_device(struct hv_device *device)
{
struct netvsc_device *net_device;
struct net_device *ndev = hv_get_drvdata(device);
int i;
net_device = kzalloc(sizeof(struct netvsc_device), GFP_KERNEL);
if (!net_device)
@ -58,9 +57,6 @@ static struct netvsc_device *alloc_net_device(struct hv_device *device)
net_device->max_pkt = RNDIS_MAX_PKT_DEFAULT;
net_device->pkt_align = RNDIS_PKT_ALIGN_DEFAULT;
for (i = 0; i < num_online_cpus(); i++)
spin_lock_init(&net_device->msd[i].lock);
hv_set_drvdata(device, net_device);
return net_device;
}
@ -850,7 +846,6 @@ int netvsc_send(struct hv_device *device,
u16 q_idx = packet->q_idx;
u32 pktlen = packet->total_data_buflen, msd_len = 0;
unsigned int section_index = NETVSC_INVALID_INDEX;
unsigned long flag;
struct multi_send_data *msdp;
struct hv_netvsc_packet *msd_send = NULL, *cur_send = NULL;
bool try_batch;
@ -867,7 +862,6 @@ int netvsc_send(struct hv_device *device,
msdp = &net_device->msd[q_idx];
/* batch packets in send buffer if possible */
spin_lock_irqsave(&msdp->lock, flag);
if (msdp->pkt)
msd_len = msdp->pkt->total_data_buflen;
@ -927,8 +921,6 @@ int netvsc_send(struct hv_device *device,
cur_send = packet;
}
spin_unlock_irqrestore(&msdp->lock, flag);
if (msd_send) {
m_ret = netvsc_send_pkt(msd_send, net_device);