Merge branch 'netvsc-small-cleanups'
Stephen Hemminger says:
====================
netvsc: small cleanups
These are all small optimizations found during development of later features.
====================
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/hyperv/hyperv_net.h b/drivers/net/hyperv/hyperv_net.h
index 262b2ea..f82d54e 100644
--- a/drivers/net/hyperv/hyperv_net.h
+++ b/drivers/net/hyperv/hyperv_net.h
@@ -763,8 +763,7 @@ struct netvsc_device {
refcount_t sc_offered;
- /* Holds rndis device info */
- void *extension;
+ struct rndis_device *extension;
int ring_size;
diff --git a/drivers/net/hyperv/netvsc.c b/drivers/net/hyperv/netvsc.c
index 652453d..7c5ed8f 100644
--- a/drivers/net/hyperv/netvsc.c
+++ b/drivers/net/hyperv/netvsc.c
@@ -97,16 +97,6 @@ static void free_netvsc_device_rcu(struct netvsc_device *nvdev)
call_rcu(&nvdev->rcu, free_netvsc_device);
}
-static struct netvsc_device *get_outbound_net_device(struct hv_device *device)
-{
- struct netvsc_device *net_device = hv_device_to_netvsc_device(device);
-
- if (net_device && net_device->destroy)
- net_device = NULL;
-
- return net_device;
-}
-
static void netvsc_destroy_buf(struct hv_device *device)
{
struct nvsp_message *revoke_packet;
@@ -243,18 +233,15 @@ static void netvsc_destroy_buf(struct hv_device *device)
kfree(net_device->send_section_map);
}
-static int netvsc_init_buf(struct hv_device *device)
+static int netvsc_init_buf(struct hv_device *device,
+ struct netvsc_device *net_device)
{
int ret = 0;
- struct netvsc_device *net_device;
struct nvsp_message *init_packet;
struct net_device *ndev;
size_t map_words;
int node;
- net_device = get_outbound_net_device(device);
- if (!net_device)
- return -ENODEV;
ndev = hv_get_drvdata(device);
node = cpu_to_node(device->channel->target_cpu);
@@ -285,9 +272,7 @@ static int netvsc_init_buf(struct hv_device *device)
/* Notify the NetVsp of the gpadl handle */
init_packet = &net_device->channel_init_pkt;
-
memset(init_packet, 0, sizeof(struct nvsp_message));
-
init_packet->hdr.msg_type = NVSP_MSG1_TYPE_SEND_RECV_BUF;
init_packet->msg.v1_msg.send_recv_buf.
gpadl_handle = net_device->recv_buf_gpadl_handle;
@@ -486,20 +471,15 @@ static int negotiate_nvsp_ver(struct hv_device *device,
return ret;
}
-static int netvsc_connect_vsp(struct hv_device *device)
+static int netvsc_connect_vsp(struct hv_device *device,
+ struct netvsc_device *net_device)
{
- int ret;
- struct netvsc_device *net_device;
- struct nvsp_message *init_packet;
- int ndis_version;
const u32 ver_list[] = {
NVSP_PROTOCOL_VERSION_1, NVSP_PROTOCOL_VERSION_2,
- NVSP_PROTOCOL_VERSION_4, NVSP_PROTOCOL_VERSION_5 };
- int i;
-
- net_device = get_outbound_net_device(device);
- if (!net_device)
- return -ENODEV;
+ NVSP_PROTOCOL_VERSION_4, NVSP_PROTOCOL_VERSION_5
+ };
+ struct nvsp_message *init_packet;
+ int ndis_version, i, ret;
init_packet = &net_device->channel_init_pkt;
@@ -549,7 +529,7 @@ static int netvsc_connect_vsp(struct hv_device *device)
net_device->recv_buf_size = NETVSC_RECEIVE_BUFFER_SIZE;
net_device->send_buf_size = NETVSC_SEND_BUFFER_SIZE;
- ret = netvsc_init_buf(device);
+ ret = netvsc_init_buf(device, net_device);
cleanup:
return ret;
@@ -843,7 +823,7 @@ int netvsc_send(struct hv_device *device,
struct hv_page_buffer **pb,
struct sk_buff *skb)
{
- struct netvsc_device *net_device;
+ struct netvsc_device *net_device = hv_device_to_netvsc_device(device);
int ret = 0;
struct netvsc_channel *nvchan;
u32 pktlen = packet->total_data_buflen, msd_len = 0;
@@ -854,15 +834,15 @@ int netvsc_send(struct hv_device *device,
bool try_batch;
bool xmit_more = (skb != NULL) ? skb->xmit_more : false;
- net_device = get_outbound_net_device(device);
- if (!net_device)
+ /* If device is rescinded, return error and packet will get dropped. */
+ if (unlikely(net_device->destroy))
return -ENODEV;
/* We may race with netvsc_connect_vsp()/netvsc_init_buf() and get
* here before the negotiation with the host is finished and
* send_section_map may not be allocated yet.
*/
- if (!net_device->send_section_map)
+ if (unlikely(!net_device->send_section_map))
return -EAGAIN;
nvchan = &net_device->chan_table[packet->q_idx];
@@ -1349,7 +1329,7 @@ int netvsc_device_add(struct hv_device *device,
rcu_assign_pointer(net_device_ctx->nvdev, net_device);
/* Connect with the NetVsp */
- ret = netvsc_connect_vsp(device);
+ ret = netvsc_connect_vsp(device, net_device);
if (ret != 0) {
netdev_err(ndev,
"unable to connect to NetVSP - %d\n", ret);
@@ -1368,4 +1348,5 @@ int netvsc_device_add(struct hv_device *device,
free_netvsc_device(&net_device->rcu);
return ret;
+
}
diff --git a/drivers/net/hyperv/netvsc_drv.c b/drivers/net/hyperv/netvsc_drv.c
index 2564ac8..436a3ad 100644
--- a/drivers/net/hyperv/netvsc_drv.c
+++ b/drivers/net/hyperv/netvsc_drv.c
@@ -120,7 +120,7 @@ static int netvsc_close(struct net_device *net)
struct net_device_context *net_device_ctx = netdev_priv(net);
struct netvsc_device *nvdev = rtnl_dereference(net_device_ctx->nvdev);
int ret;
- u32 aread, awrite, i, msec = 10, retry = 0, retry_max = 20;
+ u32 aread, i, msec = 10, retry = 0, retry_max = 20;
struct vmbus_channel *chn;
netif_tx_disable(net);
@@ -141,15 +141,11 @@ static int netvsc_close(struct net_device *net)
if (!chn)
continue;
- hv_get_ringbuffer_availbytes(&chn->inbound, &aread,
- &awrite);
-
+ aread = hv_get_bytes_to_read(&chn->inbound);
if (aread)
break;
- hv_get_ringbuffer_availbytes(&chn->outbound, &aread,
- &awrite);
-
+ aread = hv_get_bytes_to_read(&chn->outbound);
if (aread)
break;
}
@@ -345,34 +341,14 @@ static u32 init_page_array(void *hdr, u32 len, struct sk_buff *skb,
return slots_used;
}
-static int count_skb_frag_slots(struct sk_buff *skb)
+/* Estimate number of page buffers neede to transmit
+ * Need at most 2 for RNDIS header plus skb body and fragments.
+ */
+static unsigned int netvsc_get_slots(const struct sk_buff *skb)
{
- int i, frags = skb_shinfo(skb)->nr_frags;
- int pages = 0;
-
- for (i = 0; i < frags; i++) {
- skb_frag_t *frag = skb_shinfo(skb)->frags + i;
- unsigned long size = skb_frag_size(frag);
- unsigned long offset = frag->page_offset;
-
- /* Skip unused frames from start of page */
- offset &= ~PAGE_MASK;
- pages += PFN_UP(offset + size);
- }
- return pages;
-}
-
-static int netvsc_get_slots(struct sk_buff *skb)
-{
- char *data = skb->data;
- unsigned int offset = offset_in_page(data);
- unsigned int len = skb_headlen(skb);
- int slots;
- int frag_slots;
-
- slots = DIV_ROUND_UP(offset + len, PAGE_SIZE);
- frag_slots = count_skb_frag_slots(skb);
- return slots + frag_slots;
+ return PFN_UP(offset_in_page(skb->data) + skb_headlen(skb))
+ + skb_shinfo(skb)->nr_frags
+ + 2;
}
static u32 net_checksum_info(struct sk_buff *skb)
@@ -410,21 +386,18 @@ static int netvsc_start_xmit(struct sk_buff *skb, struct net_device *net)
struct hv_page_buffer page_buf[MAX_PAGE_BUFFER_COUNT];
struct hv_page_buffer *pb = page_buf;
- /* We will atmost need two pages to describe the rndis
- * header. We can only transmit MAX_PAGE_BUFFER_COUNT number
+ /* We can only transmit MAX_PAGE_BUFFER_COUNT number
* of pages in a single packet. If skb is scattered around
* more pages we try linearizing it.
*/
-
- num_data_pgs = netvsc_get_slots(skb) + 2;
-
+ num_data_pgs = netvsc_get_slots(skb);
if (unlikely(num_data_pgs > MAX_PAGE_BUFFER_COUNT)) {
++net_device_ctx->eth_stats.tx_scattered;
if (skb_linearize(skb))
goto no_memory;
- num_data_pgs = netvsc_get_slots(skb) + 2;
+ num_data_pgs = netvsc_get_slots(skb);
if (num_data_pgs > MAX_PAGE_BUFFER_COUNT) {
++net_device_ctx->eth_stats.tx_too_big;
goto drop;