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ixgbe: Use bool flag to see if the packet unmapping is delayed in HWRSC 

We can't use zero magic "bad" value to check if IXGBE_RSC_CB(skb)->dma
is valid. It is only valid in x86/arm/m68k/alpha architectures and in
spark, powerPC and other architectures it should be ~0. As per
Benjamin Herrenschmidt feedback use a bool flag to decide if
the packet unmapping is delayed in hardware RSC till EOP is reached

Signed-off-by: Mallikarjuna R Chilakala <mallikarjuna.chilakala@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Mallikarjuna R Chilakala 2010-05-13 17:33:21 +00:00 committed by David S. Miller
parent e433ea1fb0
commit e8171aaad7
1 changed files with 11 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

13
drivers/net/ixgbe/ixgbe_main.c
View File

@ -1160,6 +1160,7 @@ static inline struct sk_buff *ixgbe_transform_rsc_queue(struct sk_buff *skb,
struct ixgbe_rsc_cb {
dma_addr_t dma;
bool delay_unmap;
};
#define IXGBE_RSC_CB(skb) ((struct ixgbe_rsc_cb *)(skb)->cb)
@ -1215,7 +1216,7 @@ static bool ixgbe_clean_rx_irq(struct ixgbe_q_vector *q_vector,
if (rx_buffer_info->dma) {
if ((adapter->flags2 & IXGBE_FLAG2_RSC_ENABLED) &&
(!(staterr & IXGBE_RXD_STAT_EOP)) &&
(!(skb->prev)))
(!(skb->prev))) {
/*
* When HWRSC is enabled, delay unmapping
* of the first packet. It carries the
@ -1223,12 +1224,14 @@ static bool ixgbe_clean_rx_irq(struct ixgbe_q_vector *q_vector,
* access the header after the writeback.
* Only unmap it when EOP is reached
*/
IXGBE_RSC_CB(skb)->delay_unmap = true;
IXGBE_RSC_CB(skb)->dma = rx_buffer_info->dma;
else
} else {
dma_unmap_single(&pdev->dev,
rx_buffer_info->dma,
rx_ring->rx_buf_len,
DMA_FROM_DEVICE);
}
rx_buffer_info->dma = 0;
skb_put(skb, len);
}
@ -1276,12 +1279,13 @@ static bool ixgbe_clean_rx_irq(struct ixgbe_q_vector *q_vector,
if (skb->prev)
skb = ixgbe_transform_rsc_queue(skb, &(rx_ring->rsc_count));
if (adapter->flags2 & IXGBE_FLAG2_RSC_ENABLED) {
if (IXGBE_RSC_CB(skb)->dma) {
if (IXGBE_RSC_CB(skb)->delay_unmap) {
dma_unmap_single(&pdev->dev,
IXGBE_RSC_CB(skb)->dma,
rx_ring->rx_buf_len,
DMA_FROM_DEVICE);
IXGBE_RSC_CB(skb)->dma = 0;
IXGBE_RSC_CB(skb)->delay_unmap = false;
}
if (rx_ring->flags & IXGBE_RING_RX_PS_ENABLED)
rx_ring->rsc_count += skb_shinfo(skb)->nr_frags;
@ -3505,12 +3509,13 @@ static void ixgbe_clean_rx_ring(struct ixgbe_adapter *adapter,
rx_buffer_info->skb = NULL;
do {
struct sk_buff *this = skb;
if (IXGBE_RSC_CB(this)->dma) {
if (IXGBE_RSC_CB(this)->delay_unmap) {
dma_unmap_single(&pdev->dev,
IXGBE_RSC_CB(this)->dma,
rx_ring->rx_buf_len,
DMA_FROM_DEVICE);
IXGBE_RSC_CB(this)->dma = 0;
IXGBE_RSC_CB(skb)->delay_unmap = false;
}
skb = skb->prev;
dev_kfree_skb(this);