mirrors/linux-stable
1
0
Fork 0
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git synced 2024-08-29 04:09:39 +00:00
Code Issues Releases Wiki Activity

mv643xx_eth: move port_receive() into its only caller

Browse source 
The port_receive() function is a remnant of the original mv643xx_eth
HAL split.  This patch moves port_receive() into its caller, so that
the top and the bottom half of RX processing no longer communicate
via the HAL FUNC_RET_STATUS/pkt_info mechanism abstraction anymore.

Signed-off-by: Lennert Buytenhek <buytenh@marvell.com>
Acked-by: Dale Farnsworth <dale@farnsworth.org>
This commit is contained in:
Lennert Buytenhek 2008-06-01 10:31:56 +02:00
parent 5daffe945a
commit 9658766152
1 changed files with 35 additions and 62 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

97
drivers/net/mv643xx_eth.c
View file

@ -518,64 +518,38 @@ static inline void mv643xx_eth_rx_refill_descs_timer_wrapper(unsigned long data)
mv643xx_eth_rx_refill_descs((struct net_device *)data);
}
static FUNC_RET_STATUS port_receive(struct mv643xx_eth_private *mp,
struct pkt_info *pkt_info)
{
int rx_next_curr_desc, rx_curr_desc, rx_used_desc;
volatile struct rx_desc *rx_desc;
unsigned int command_status;
unsigned long flags;
spin_lock_irqsave(&mp->lock, flags);
/* Get the Rx Desc ring 'curr and 'used' indexes */
rx_curr_desc = mp->rx_curr_desc;
rx_used_desc = mp->rx_used_desc;
rx_desc = &mp->rx_desc_area[rx_curr_desc];
/* The following parameters are used to save readings from memory */
command_status = rx_desc->cmd_sts;
rmb();
/* Nothing to receive... */
if (command_status & BUFFER_OWNED_BY_DMA) {
spin_unlock_irqrestore(&mp->lock, flags);
return ETH_END_OF_JOB;
}
pkt_info->byte_cnt = rx_desc->byte_cnt - ETH_HW_IP_ALIGN;
pkt_info->cmd_sts = command_status;
pkt_info->buf_ptr = rx_desc->buf_ptr + ETH_HW_IP_ALIGN;
pkt_info->return_info = mp->rx_skb[rx_curr_desc];
pkt_info->l4i_chk = rx_desc->buf_size;
/*
* Clean the return info field to indicate that the
* packet has been moved to the upper layers
*/
mp->rx_skb[rx_curr_desc] = NULL;
/* Update current index in data structure */
rx_next_curr_desc = (rx_curr_desc + 1) % mp->rx_ring_size;
mp->rx_curr_desc = rx_next_curr_desc;
spin_unlock_irqrestore(&mp->lock, flags);
return ETH_OK;
}
static int mv643xx_eth_receive_queue(struct net_device *dev, int budget)
{
struct mv643xx_eth_private *mp = netdev_priv(dev);
struct net_device_stats *stats = &dev->stats;
unsigned int received_packets = 0;
struct sk_buff *skb;
struct pkt_info pkt_info;
while (budget-- > 0 && port_receive(mp, &pkt_info) == ETH_OK) {
dma_unmap_single(NULL, pkt_info.buf_ptr, ETH_RX_SKB_SIZE,
DMA_FROM_DEVICE);
while (budget-- > 0) {
struct sk_buff *skb;
volatile struct rx_desc *rx_desc;
unsigned int cmd_sts;
unsigned long flags;
spin_lock_irqsave(&mp->lock, flags);
rx_desc = &mp->rx_desc_area[mp->rx_curr_desc];
cmd_sts = rx_desc->cmd_sts;
if (cmd_sts & BUFFER_OWNED_BY_DMA) {
spin_unlock_irqrestore(&mp->lock, flags);
break;
}
rmb();
skb = mp->rx_skb[mp->rx_curr_desc];
mp->rx_skb[mp->rx_curr_desc] = NULL;
mp->rx_curr_desc = (mp->rx_curr_desc + 1) % mp->rx_ring_size;
spin_unlock_irqrestore(&mp->lock, flags);
dma_unmap_single(NULL, rx_desc->buf_ptr + ETH_HW_IP_ALIGN,
ETH_RX_SKB_SIZE, DMA_FROM_DEVICE);
mp->rx_desc_count--;
received_packets++;
@ -584,18 +558,17 @@ static int mv643xx_eth_receive_queue(struct net_device *dev, int budget)
* Note byte count includes 4 byte CRC count
*/
stats->rx_packets++;
stats->rx_bytes += pkt_info.byte_cnt;
skb = pkt_info.return_info;
stats->rx_bytes += rx_desc->byte_cnt - ETH_HW_IP_ALIGN;
/*
* In case received a packet without first / last bits on OR
* the error summary bit is on, the packets needs to be dropeed.
*/
if (((pkt_info.cmd_sts & (RX_FIRST_DESC | RX_LAST_DESC)) !=
if (((cmd_sts & (RX_FIRST_DESC | RX_LAST_DESC)) !=
(RX_FIRST_DESC | RX_LAST_DESC))
|| (pkt_info.cmd_sts & ERROR_SUMMARY)) {
|| (cmd_sts & ERROR_SUMMARY)) {
stats->rx_dropped++;
if ((pkt_info.cmd_sts & (RX_FIRST_DESC |
RX_LAST_DESC)) !=
if ((cmd_sts & (RX_FIRST_DESC | RX_LAST_DESC)) !=
(RX_FIRST_DESC | RX_LAST_DESC)) {
if (net_ratelimit())
printk(KERN_ERR
@ -603,7 +576,7 @@ static int mv643xx_eth_receive_queue(struct net_device *dev, int budget)
"on multiple descriptors\n",
dev->name);
}
if (pkt_info.cmd_sts & ERROR_SUMMARY)
if (cmd_sts & ERROR_SUMMARY)
stats->rx_errors++;
dev_kfree_skb_irq(skb);
@ -612,12 +585,12 @@ static int mv643xx_eth_receive_queue(struct net_device *dev, int budget)
* The -4 is for the CRC in the trailer of the
* received packet
*/
skb_put(skb, pkt_info.byte_cnt - 4);
skb_put(skb, rx_desc->byte_cnt - ETH_HW_IP_ALIGN - 4);
if (pkt_info.cmd_sts & LAYER_4_CHECKSUM_OK) {
if (cmd_sts & LAYER_4_CHECKSUM_OK) {
skb->ip_summed = CHECKSUM_UNNECESSARY;
skb->csum = htons(
(pkt_info.cmd_sts & 0x0007fff8) >> 3);
(cmd_sts & 0x0007fff8) >> 3);
}
skb->protocol = eth_type_trans(skb, dev);
#ifdef MV643XX_ETH_NAPI