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r8152: adjust tx_bottom function 

Split some parts of code into another function to simplify
tx_bottom(). Use while loop to replace the goto loop.

Signed-off-by: Hayes Wang <hayeswang@realtek.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
hayeswang 2013-08-16 16:09:37 +08:00 committed by David S. Miller
parent 43a4478d65
commit b1379d9a20
1 changed files with 71 additions and 69 deletions
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140
drivers/net/usb/r8152.c
View File

@ -1131,6 +1131,51 @@ r8152_tx_csum(struct r8152 *tp, struct tx_desc *desc, struct sk_buff *skb)
}
}
static int r8152_tx_agg_fill(struct r8152 *tp, struct tx_agg *agg)
{
u32 remain;
u8 *tx_data;
tx_data = agg->head;
agg->skb_num = agg->skb_len = 0;
remain = rx_buf_sz - sizeof(struct tx_desc);
while (remain >= ETH_ZLEN) {
struct tx_desc *tx_desc;
struct sk_buff *skb;
unsigned int len;
skb = skb_dequeue(&tp->tx_queue);
if (!skb)
break;
len = skb->len;
if (remain < len) {
skb_queue_head(&tp->tx_queue, skb);
break;
}
tx_desc = (struct tx_desc *)tx_data;
tx_data += sizeof(*tx_desc);
r8152_tx_csum(tp, tx_desc, skb);
memcpy(tx_data, skb->data, len);
agg->skb_num++;
agg->skb_len += len;
dev_kfree_skb_any(skb);
tx_data = tx_agg_align(tx_data + len);
remain = rx_buf_sz - sizeof(*tx_desc) -
(u32)((void *)tx_data - agg->head);
}
usb_fill_bulk_urb(agg->urb, tp->udev, usb_sndbulkpipe(tp->udev, 2),
agg->head, (int)(tx_data - (u8 *)agg->head),
(usb_complete_t)write_bulk_callback, agg);
return usb_submit_urb(agg->urb, GFP_ATOMIC);
}
static void rx_bottom(struct r8152 *tp)
{
unsigned long flags;
@ -1204,82 +1249,39 @@ static void rx_bottom(struct r8152 *tp)
static void tx_bottom(struct r8152 *tp)
{
struct net_device_stats *stats;
struct net_device *netdev;
struct tx_agg *agg;
unsigned long flags;
u32 remain, total;
u8 *tx_data;
int res;
netdev = tp->netdev;
do {
struct tx_agg *agg;
next_agg:
agg = NULL;
if (skb_queue_empty(&tp->tx_queue))
return;
agg = r8152_get_tx_agg(tp);
if (!agg)
return;
tx_data = agg->head;
agg->skb_num = agg->skb_len = 0;
remain = rx_buf_sz - sizeof(struct tx_desc);
total = 0;
while (remain >= ETH_ZLEN) {
struct tx_desc *tx_desc;
struct sk_buff *skb;
unsigned int len;
skb = skb_dequeue(&tp->tx_queue);
if (!skb)
if (skb_queue_empty(&tp->tx_queue))
break;
len = skb->len;
if (remain < len) {
skb_queue_head(&tp->tx_queue, skb);
agg = r8152_get_tx_agg(tp);
if (!agg)
break;
res = r8152_tx_agg_fill(tp, agg);
if (res) {
struct net_device_stats *stats;
struct net_device *netdev;
unsigned long flags;
netdev = tp->netdev;
stats = rtl8152_get_stats(netdev);
if (res == -ENODEV) {
netif_device_detach(netdev);
} else {
netif_warn(tp, tx_err, netdev,
"failed tx_urb %d\n", res);
stats->tx_dropped += agg->skb_num;
spin_lock_irqsave(&tp->tx_lock, flags);
list_add_tail(&agg->list, &tp->tx_free);
spin_unlock_irqrestore(&tp->tx_lock, flags);
}
}
tx_data = tx_agg_align(tx_data);
tx_desc = (struct tx_desc *)tx_data;
tx_data += sizeof(*tx_desc);
r8152_tx_csum(tp, tx_desc, skb);
memcpy(tx_data, skb->data, len);
agg->skb_num++;
agg->skb_len += len;
dev_kfree_skb_any(skb);
tx_data += len;
remain = rx_buf_sz - sizeof(*tx_desc) -
(u32)(tx_agg_align(tx_data) - agg->head);
}
usb_fill_bulk_urb(agg->urb, tp->udev, usb_sndbulkpipe(tp->udev, 2),
agg->head, (int)(tx_data - (u8 *)agg->head),
(usb_complete_t)write_bulk_callback, agg);
res = usb_submit_urb(agg->urb, GFP_ATOMIC);
stats = rtl8152_get_stats(netdev);
if (res) {
/* Can we get/handle EPIPE here? */
if (res == -ENODEV) {
netif_device_detach(netdev);
} else {
netif_warn(tp, tx_err, netdev,
"failed tx_urb %d\n", res);
stats->tx_dropped += agg->skb_num;
spin_lock_irqsave(&tp->tx_lock, flags);
list_add_tail(&agg->list, &tp->tx_free);
spin_unlock_irqrestore(&tp->tx_lock, flags);
}
return;
}
goto next_agg;
} while (res == 0);
}
static void bottom_half(unsigned long data)