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igb: Refactor clean_rx_irq to reduce overhead and improve performance

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This change is meant to be a general cleanup and performance improvement
for clean_rx_irq.  The previous patch should have updated the allocation so
that the rings can be treated as read-only within the clean_rx_irq
function.  In addition I am re-ordering the operations such that several
goals are accomplished including reducing the overhead for packet
accounting, reducing the number of items on the stack, and improving
overall performance.

Signed-off-by: Alexander Duyck <alexander.h.duyck@intel.com>
Tested-by:  Aaron Brown  <aaron.f.brown@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
This commit is contained in:
Alexander Duyck 2011-08-26 07:43:54 +00:00 committed by Jeff Kirsher
parent 238ac817fd
commit 16eb8815c2
1 changed files with 47 additions and 49 deletions
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96
drivers/net/ethernet/intel/igb/igb_main.c
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@ -138,7 +138,7 @@ static void igb_setup_dca(struct igb_adapter *);
#endif /* CONFIG_IGB_DCA */
static bool igb_clean_tx_irq(struct igb_q_vector *);
static int igb_poll(struct napi_struct *, int);
static bool igb_clean_rx_irq_adv(struct igb_q_vector *, int *, int);
static bool igb_clean_rx_irq_adv(struct igb_q_vector *, int);
static int igb_ioctl(struct net_device *, struct ifreq *, int cmd);
static void igb_tx_timeout(struct net_device *);
static void igb_reset_task(struct work_struct *);
@ -5481,28 +5481,27 @@ static int igb_poll(struct napi_struct *napi, int budget)
struct igb_q_vector *q_vector = container_of(napi,
struct igb_q_vector,
napi);
int tx_clean_complete = 1, work_done = 0;
bool clean_complete = true;
#ifdef CONFIG_IGB_DCA
if (q_vector->adapter->flags & IGB_FLAG_DCA_ENABLED)
igb_update_dca(q_vector);
#endif
if (q_vector->tx_ring)
tx_clean_complete = igb_clean_tx_irq(q_vector);
clean_complete = !!igb_clean_tx_irq(q_vector);
if (q_vector->rx_ring)
igb_clean_rx_irq_adv(q_vector, &work_done, budget);
clean_complete &= igb_clean_rx_irq_adv(q_vector, budget);
if (!tx_clean_complete)
work_done = budget;
/* If all work not completed, return budget and keep polling */
if (!clean_complete)
return budget;
/* If not enough Rx work done, exit the polling mode */
if (work_done < budget) {
napi_complete(napi);
igb_ring_irq_enable(q_vector);
}
napi_complete(napi);
igb_ring_irq_enable(q_vector);
return work_done;
return 0;
}
/**
@ -5751,37 +5750,26 @@ static inline u16 igb_get_hlen(union e1000_adv_rx_desc *rx_desc)
return hlen;
}
static bool igb_clean_rx_irq_adv(struct igb_q_vector *q_vector,
int *work_done, int budget)
static bool igb_clean_rx_irq_adv(struct igb_q_vector *q_vector, int budget)
{
struct igb_ring *rx_ring = q_vector->rx_ring;
struct net_device *netdev = rx_ring->netdev;
struct device *dev = rx_ring->dev;
union e1000_adv_rx_desc *rx_desc , *next_rxd;
struct igb_buffer *buffer_info , *next_buffer;
struct sk_buff *skb;
bool cleaned = false;
u16 cleaned_count = igb_desc_unused(rx_ring);
int current_node = numa_node_id();
union e1000_adv_rx_desc *rx_desc;
const int current_node = numa_node_id();
unsigned int total_bytes = 0, total_packets = 0;
unsigned int i;
u32 staterr;
u16 length;
u16 cleaned_count = igb_desc_unused(rx_ring);
u16 i = rx_ring->next_to_clean;
i = rx_ring->next_to_clean;
buffer_info = &rx_ring->buffer_info[i];
rx_desc = E1000_RX_DESC_ADV(*rx_ring, i);
staterr = le32_to_cpu(rx_desc->wb.upper.status_error);
while (staterr & E1000_RXD_STAT_DD) {
if (*work_done >= budget)
break;
(*work_done)++;
rmb(); /* read descriptor and rx_buffer_info after status DD */
struct igb_buffer *buffer_info = &rx_ring->buffer_info[i];
struct sk_buff *skb = buffer_info->skb;
union e1000_adv_rx_desc *next_rxd;
skb = buffer_info->skb;
prefetch(skb->data - NET_IP_ALIGN);
buffer_info->skb = NULL;
prefetch(skb->data);
i++;
if (i == rx_ring->count)
@ -5789,42 +5777,48 @@ static bool igb_clean_rx_irq_adv(struct igb_q_vector *q_vector,
next_rxd = E1000_RX_DESC_ADV(*rx_ring, i);
prefetch(next_rxd);
next_buffer = &rx_ring->buffer_info[i];
length = le16_to_cpu(rx_desc->wb.upper.length);
cleaned = true;
cleaned_count++;
/*
* This memory barrier is needed to keep us from reading
* any other fields out of the rx_desc until we know the
* RXD_STAT_DD bit is set
*/
rmb();
if (buffer_info->dma) {
dma_unmap_single(dev, buffer_info->dma,
if (!skb_is_nonlinear(skb)) {
__skb_put(skb, igb_get_hlen(rx_desc));
dma_unmap_single(rx_ring->dev, buffer_info->dma,
IGB_RX_HDR_LEN,
DMA_FROM_DEVICE);
buffer_info->dma = 0;
skb_put(skb, igb_get_hlen(rx_desc));
}
if (length) {
dma_unmap_page(dev, buffer_info->page_dma,
PAGE_SIZE / 2, DMA_FROM_DEVICE);
buffer_info->page_dma = 0;
if (rx_desc->wb.upper.length) {
u16 length = le16_to_cpu(rx_desc->wb.upper.length);
skb_fill_page_desc(skb, skb_shinfo(skb)->nr_frags,
buffer_info->page,
buffer_info->page_offset,
length);
skb->len += length;
skb->data_len += length;
skb->truesize += length;
if ((page_count(buffer_info->page) != 1) ||
(page_to_nid(buffer_info->page) != current_node))
buffer_info->page = NULL;
else
get_page(buffer_info->page);
skb->len += length;
skb->data_len += length;
skb->truesize += length;
dma_unmap_page(rx_ring->dev, buffer_info->page_dma,
PAGE_SIZE / 2, DMA_FROM_DEVICE);
buffer_info->page_dma = 0;
}
if (!(staterr & E1000_RXD_STAT_EOP)) {
struct igb_buffer *next_buffer;
next_buffer = &rx_ring->buffer_info[i];
buffer_info->skb = next_buffer->skb;
buffer_info->dma = next_buffer->dma;
next_buffer->skb = skb;
@ -5833,7 +5827,7 @@ static bool igb_clean_rx_irq_adv(struct igb_q_vector *q_vector,
}
if (staterr & E1000_RXDEXT_ERR_FRAME_ERR_MASK) {
dev_kfree_skb_irq(skb);
dev_kfree_skb_any(skb);
goto next_desc;
}
@ -5844,7 +5838,7 @@ static bool igb_clean_rx_irq_adv(struct igb_q_vector *q_vector,
igb_rx_checksum_adv(rx_ring, staterr, skb);
skb->protocol = eth_type_trans(skb, netdev);
skb->protocol = eth_type_trans(skb, rx_ring->netdev);
if (staterr & E1000_RXD_STAT_VP) {
u16 vid = le16_to_cpu(rx_desc->wb.upper.vlan);
@ -5853,7 +5847,12 @@ static bool igb_clean_rx_irq_adv(struct igb_q_vector *q_vector,
}
napi_gro_receive(&q_vector->napi, skb);
budget--;
next_desc:
if (!budget)
break;
cleaned_count++;
/* return some buffers to hardware, one at a time is too slow */
if (cleaned_count >= IGB_RX_BUFFER_WRITE) {
igb_alloc_rx_buffers_adv(rx_ring, cleaned_count);
@ -5862,7 +5861,6 @@ static bool igb_clean_rx_irq_adv(struct igb_q_vector *q_vector,
/* use prefetched values */
rx_desc = next_rxd;
buffer_info = next_buffer;
staterr = le32_to_cpu(rx_desc->wb.upper.status_error);
}
@ -5877,7 +5875,7 @@ static bool igb_clean_rx_irq_adv(struct igb_q_vector *q_vector,
if (cleaned_count)
igb_alloc_rx_buffers_adv(rx_ring, cleaned_count);
return cleaned;
return !!budget;
}
static bool igb_alloc_mapped_skb(struct igb_ring *rx_ring,