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[PATCH] e1000: Added RX buffer enhancements

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Align the prefetches to a dword to help speed them up.
Recycle skb's and early replenish.
Force memory writes to complete before fetching more descriptors.

Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: John Ronciak <john.ronciak@intel.com>
Signed-off-by: Jeff Garzik <jgarzik@pobox.com>
This commit is contained in:
Jesse Brandeburg 2006-01-18 13:01:32 -08:00 committed by Jeff Garzik
parent 35ec56bb78
commit b92ff8ee57
1 changed files with 78 additions and 59 deletions
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137
drivers/net/e1000/e1000_main.c
View File

@ -1653,23 +1653,8 @@ e1000_setup_rctl(struct e1000_adapter *adapter)
rctl |= adapter->rx_buffer_len << 0x11;
} else {
rctl &= ~E1000_RCTL_SZ_4096;
rctl |= E1000_RCTL_BSEX;
switch (adapter->rx_buffer_len) {
case E1000_RXBUFFER_2048:
default:
rctl |= E1000_RCTL_SZ_2048;
rctl &= ~E1000_RCTL_BSEX;
break;
case E1000_RXBUFFER_4096:
rctl |= E1000_RCTL_SZ_4096;
break;
case E1000_RXBUFFER_8192:
rctl |= E1000_RCTL_SZ_8192;
break;
case E1000_RXBUFFER_16384:
rctl |= E1000_RCTL_SZ_16384;
break;
}
rctl &= ~E1000_RCTL_BSEX;
rctl |= E1000_RCTL_SZ_2048;
}
#ifndef CONFIG_E1000_DISABLE_PACKET_SPLIT
@ -3571,7 +3556,6 @@ e1000_clean_rx_irq(struct e1000_adapter *adapter,
struct pci_dev *pdev = adapter->pdev;
struct e1000_rx_desc *rx_desc;
struct e1000_buffer *buffer_info;
struct sk_buff *skb;
unsigned long flags;
uint32_t length;
uint8_t last_byte;
@ -3581,9 +3565,10 @@ e1000_clean_rx_irq(struct e1000_adapter *adapter,
i = rx_ring->next_to_clean;
rx_desc = E1000_RX_DESC(*rx_ring, i);
buffer_info = &rx_ring->buffer_info[i];
while(rx_desc->status & E1000_RXD_STAT_DD) {
buffer_info = &rx_ring->buffer_info[i];
while (rx_desc->status & E1000_RXD_STAT_DD) {
struct sk_buff *skb;
u8 status;
#ifdef CONFIG_E1000_NAPI
if(*work_done >= work_to_do)
@ -3591,6 +3576,7 @@ e1000_clean_rx_irq(struct e1000_adapter *adapter,
(*work_done)++;
#endif
status = rx_desc->status;
skb = buffer_info->skb;
cleaned = TRUE;
cleaned_count++;
pci_unmap_single(pdev,
@ -3598,20 +3584,50 @@ e1000_clean_rx_irq(struct e1000_adapter *adapter,
buffer_info->length,
PCI_DMA_FROMDEVICE);
skb = buffer_info->skb;
length = le16_to_cpu(rx_desc->length);
if(unlikely(!(rx_desc->status & E1000_RXD_STAT_EOP))) {
/* All receives must fit into a single buffer */
E1000_DBG("%s: Receive packet consumed multiple"
" buffers\n", netdev->name);
dev_kfree_skb_irq(skb);
skb_put(skb, length);
if (!(status & E1000_RXD_STAT_EOP)) {
if (!rx_ring->rx_skb_top) {
rx_ring->rx_skb_top = skb;
rx_ring->rx_skb_top->len = length;
rx_ring->rx_skb_prev = skb;
} else {
if (skb_shinfo(rx_ring->rx_skb_top)->frag_list) {
rx_ring->rx_skb_prev->next = skb;
skb->prev = rx_ring->rx_skb_prev;
} else {
skb_shinfo(rx_ring->rx_skb_top)->frag_list = skb;
}
rx_ring->rx_skb_prev = skb;
rx_ring->rx_skb_top->data_len += length;
}
goto next_desc;
} else {
if (rx_ring->rx_skb_top) {
if (skb_shinfo(rx_ring->rx_skb_top)
->frag_list) {
rx_ring->rx_skb_prev->next = skb;
skb->prev = rx_ring->rx_skb_prev;
} else
skb_shinfo(rx_ring->rx_skb_top)
->frag_list = skb;
rx_ring->rx_skb_top->data_len += length;
rx_ring->rx_skb_top->len +=
rx_ring->rx_skb_top->data_len;
skb = rx_ring->rx_skb_top;
multi_descriptor = TRUE;
rx_ring->rx_skb_top = NULL;
rx_ring->rx_skb_prev = NULL;
}
}
if(unlikely(rx_desc->errors & E1000_RXD_ERR_FRAME_ERR_MASK)) {
last_byte = *(skb->data + length - 1);
if(TBI_ACCEPT(&adapter->hw, rx_desc->status,
if (TBI_ACCEPT(&adapter->hw, status,
rx_desc->errors, length, last_byte)) {
spin_lock_irqsave(&adapter->stats_lock, flags);
e1000_tbi_adjust_stats(&adapter->hw,
@ -3668,7 +3684,7 @@ e1000_clean_rx_irq(struct e1000_adapter *adapter,
}
#else /* CONFIG_E1000_NAPI */
if(unlikely(adapter->vlgrp &&
(rx_desc->status & E1000_RXD_STAT_VP))) {
(status & E1000_RXD_STAT_VP))) {
vlan_hwaccel_rx(skb, adapter->vlgrp,
le16_to_cpu(rx_desc->special) &
E1000_RXD_SPC_VLAN_MASK);
@ -3795,12 +3811,8 @@ e1000_clean_rx_irq_ps(struct e1000_adapter *adapter,
skb->protocol = eth_type_trans(skb, netdev);
if(likely(rx_desc->wb.upper.header_status &
E1000_RXDPS_HDRSTAT_HDRSP)) {
E1000_RXDPS_HDRSTAT_HDRSP))
adapter->rx_hdr_split++;
#ifdef HAVE_RX_ZERO_COPY
skb_shinfo(skb)->zero_copy = TRUE;
#endif
}
#ifdef CONFIG_E1000_NAPI
if(unlikely(adapter->vlgrp && (staterr & E1000_RXD_STAT_VP))) {
vlan_hwaccel_receive_skb(skb, adapter->vlgrp,
@ -3940,20 +3952,22 @@ e1000_alloc_rx_buffers(struct e1000_adapter *adapter,
rx_desc = E1000_RX_DESC(*rx_ring, i);
rx_desc->buffer_addr = cpu_to_le64(buffer_info->dma);
if(unlikely((i & ~(E1000_RX_BUFFER_WRITE - 1)) == i)) {
/* Force memory writes to complete before letting h/w
* know there are new descriptors to fetch. (Only
* applicable for weak-ordered memory model archs,
* such as IA-64). */
wmb();
writel(i, adapter->hw.hw_addr + rx_ring->rdt);
}
if(unlikely(++i == rx_ring->count)) i = 0;
buffer_info = &rx_ring->buffer_info[i];
}
rx_ring->next_to_use = i;
if (likely(rx_ring->next_to_use != i)) {
rx_ring->next_to_use = i;
if (unlikely(i-- == 0))
i = (rx_ring->count - 1);
/* Force memory writes to complete before letting h/w
* know there are new descriptors to fetch. (Only
* applicable for weak-ordered memory model archs,
* such as IA-64). */
wmb();
writel(i, adapter->hw.hw_addr + rx_ring->rdt);
}
}
/**
@ -3988,8 +4002,10 @@ e1000_alloc_rx_buffers_ps(struct e1000_adapter *adapter,
if (likely(!ps_page->ps_page[j])) {
ps_page->ps_page[j] =
alloc_page(GFP_ATOMIC);
if (unlikely(!ps_page->ps_page[j]))
if (unlikely(!ps_page->ps_page[j])) {
adapter->alloc_rx_buff_failed++;
goto no_buffers;
}
ps_page_dma->ps_page_dma[j] =
pci_map_page(pdev,
ps_page->ps_page[j],
@ -4008,8 +4024,10 @@ e1000_alloc_rx_buffers_ps(struct e1000_adapter *adapter,
skb = dev_alloc_skb(adapter->rx_ps_bsize0 + NET_IP_ALIGN);
if(unlikely(!skb))
if (unlikely(!skb)) {
adapter->alloc_rx_buff_failed++;
break;
}
/* Make buffer alignment 2 beyond a 16 byte boundary
* this will result in a 16 byte aligned IP header after
@ -4027,19 +4045,6 @@ e1000_alloc_rx_buffers_ps(struct e1000_adapter *adapter,
rx_desc->read.buffer_addr[0] = cpu_to_le64(buffer_info->dma);
if(unlikely((i & ~(E1000_RX_BUFFER_WRITE - 1)) == i)) {
/* Force memory writes to complete before letting h/w
* know there are new descriptors to fetch. (Only
* applicable for weak-ordered memory model archs,
* such as IA-64). */
wmb();
/* Hardware increments by 16 bytes, but packet split
* descriptors are 32 bytes...so we increment tail
* twice as much.
*/
writel(i<<1, adapter->hw.hw_addr + rx_ring->rdt);
}
if(unlikely(++i == rx_ring->count)) i = 0;
buffer_info = &rx_ring->buffer_info[i];
ps_page = &rx_ring->ps_page[i];
@ -4047,7 +4052,21 @@ e1000_alloc_rx_buffers_ps(struct e1000_adapter *adapter,
}
no_buffers:
rx_ring->next_to_use = i;
if (likely(rx_ring->next_to_use != i)) {
rx_ring->next_to_use = i;
if (unlikely(i-- == 0)) i = (rx_ring->count - 1);
/* Force memory writes to complete before letting h/w
* know there are new descriptors to fetch. (Only
* applicable for weak-ordered memory model archs,
* such as IA-64). */
wmb();
/* Hardware increments by 16 bytes, but packet split
* descriptors are 32 bytes...so we increment tail
* twice as much.
*/
writel(i<<1, adapter->hw.hw_addr + rx_ring->rdt);
}
}
/**