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SubjectRe: [NET-NEXT PATCH] e1000: remove unused Kconfig option for disabling packet split
On Wed, 3 Sep 2008, Jeff Garzik wrote:
> > From: Jesse Brandeburg <jesse.brandeburg@intel.com>
> >
> > Since the e1000/e1000e split, no hardware supported by e1000
> > supports packet split, just remove the Kconfig option and associated
> > code from arch/* and the driver.
> >
> > Signed-off-by: Jesse Brandeburg <jesse.brandeburg@intel.com>
> > Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
> > ---
> >
> > arch/arm/configs/iop13xx_defconfig | 1
> > arch/arm/configs/iop32x_defconfig | 1
>
> ACK, except for the defconfig changes. arch maintainers usually prefer to do
> that themselves.
>
> We'd be continually patch defconfig files, if we did so every time it was
> likely one would be updated by a Kconfig patch.

Here is an updated patch without the defconfig changes

== cut here ==

e1000: remove Kconfig option for packet split and e1000 related code

From: Jesse Brandeburg <jesse.brandeburg@intel.com>

Since the e1000/e1000e split, no hardware supported by e1000
supports packet split, just remove the Kconfig option and associated
code from the driver.

reposted without the defconfig changes, should apply to net-next

Signed-off-by: Jesse Brandeburg <jesse.brandeburg@intel.com>
---
drivers/net/Kconfig | 9 -
drivers/net/e1000/e1000.h | 17 --
drivers/net/e1000/e1000_main.c | 416 +---------------------------------------
3 files changed, 9 insertions(+), 433 deletions(-)
diff --git a/drivers/net/Kconfig b/drivers/net/Kconfig
index 4a11296..5da94f3 100644
--- a/drivers/net/Kconfig
+++ b/drivers/net/Kconfig
@@ -1927,15 +1927,6 @@ config E1000
To compile this driver as a module, choose M here. The module
will be called e1000.

-config E1000_DISABLE_PACKET_SPLIT
- bool "Disable Packet Split for PCI express adapters"
- depends on E1000
- help
- Say Y here if you want to use the legacy receive path for PCI express
- hardware.
-
- If in doubt, say N.
-
config E1000E
tristate "Intel(R) PRO/1000 PCI-Express Gigabit Ethernet support"
depends on PCI && (!SPARC32 || BROKEN)
diff --git a/drivers/net/e1000/e1000.h b/drivers/net/e1000/e1000.h
index 19e317e..62f6297 100644
--- a/drivers/net/e1000/e1000.h
+++ b/drivers/net/e1000/e1000.h
@@ -155,8 +155,6 @@ do { \
#endif

#define E1000_MNG_VLAN_NONE (-1)
-/* Number of packet split data buffers (not including the header buffer) */
-#define PS_PAGE_BUFFERS (MAX_PS_BUFFERS - 1)

/* wrapper around a pointer to a socket buffer,
* so a DMA handle can be stored along with the buffer */
@@ -168,14 +166,6 @@ struct e1000_buffer {
u16 next_to_watch;
};

-struct e1000_ps_page {
- struct page *ps_page[PS_PAGE_BUFFERS];
-};
-
-struct e1000_ps_page_dma {
- u64 ps_page_dma[PS_PAGE_BUFFERS];
-};
-
struct e1000_tx_ring {
/* pointer to the descriptor ring memory */
void *desc;
@@ -213,9 +203,6 @@ struct e1000_rx_ring {
unsigned int next_to_clean;
/* array of buffer information structs */
struct e1000_buffer *buffer_info;
- /* arrays of page information for packet split */
- struct e1000_ps_page *ps_page;
- struct e1000_ps_page_dma *ps_page_dma;

/* cpu for rx queue */
int cpu;
@@ -228,8 +215,6 @@ struct e1000_rx_ring {
((((R)->next_to_clean > (R)->next_to_use) \
? 0 : (R)->count) + (R)->next_to_clean - (R)->next_to_use - 1)

-#define E1000_RX_DESC_PS(R, i) \
- (&(((union e1000_rx_desc_packet_split *)((R).desc))[i]))
#define E1000_RX_DESC_EXT(R, i) \
(&(((union e1000_rx_desc_extended *)((R).desc))[i]))
#define E1000_GET_DESC(R, i, type) (&(((struct type *)((R).desc))[i]))
@@ -311,10 +296,8 @@ struct e1000_adapter {
u32 rx_int_delay;
u32 rx_abs_int_delay;
bool rx_csum;
- unsigned int rx_ps_pages;
u32 gorcl;
u64 gorcl_old;
- u16 rx_ps_bsize0;

/* OS defined structs */
struct net_device *netdev;
diff --git a/drivers/net/e1000/e1000_main.c b/drivers/net/e1000/e1000_main.c
index ad6da7b..2ab44db 100644
--- a/drivers/net/e1000/e1000_main.c
+++ b/drivers/net/e1000/e1000_main.c
@@ -137,15 +137,9 @@ static int e1000_clean(struct napi_struct *napi, int budget);
static bool e1000_clean_rx_irq(struct e1000_adapter *adapter,
struct e1000_rx_ring *rx_ring,
int *work_done, int work_to_do);
-static bool e1000_clean_rx_irq_ps(struct e1000_adapter *adapter,
- struct e1000_rx_ring *rx_ring,
- int *work_done, int work_to_do);
static void e1000_alloc_rx_buffers(struct e1000_adapter *adapter,
struct e1000_rx_ring *rx_ring,
int cleaned_count);
-static void e1000_alloc_rx_buffers_ps(struct e1000_adapter *adapter,
- struct e1000_rx_ring *rx_ring,
- int cleaned_count);
static int e1000_ioctl(struct net_device *netdev, struct ifreq *ifr, int cmd);
static int e1000_mii_ioctl(struct net_device *netdev, struct ifreq *ifr,
int cmd);
@@ -1331,7 +1325,6 @@ static int __devinit e1000_sw_init(struct e1000_adapter *adapter)
pci_read_config_word(pdev, PCI_COMMAND, &hw->pci_cmd_word);

adapter->rx_buffer_len = MAXIMUM_ETHERNET_VLAN_SIZE;
- adapter->rx_ps_bsize0 = E1000_RXBUFFER_128;
hw->max_frame_size = netdev->mtu +
ENET_HEADER_SIZE + ETHERNET_FCS_SIZE;
hw->min_frame_size = MINIMUM_ETHERNET_FRAME_SIZE;
@@ -1815,26 +1808,6 @@ static int e1000_setup_rx_resources(struct e1000_adapter *adapter,
}
memset(rxdr->buffer_info, 0, size);

- rxdr->ps_page = kcalloc(rxdr->count, sizeof(struct e1000_ps_page),
- GFP_KERNEL);
- if (!rxdr->ps_page) {
- vfree(rxdr->buffer_info);
- DPRINTK(PROBE, ERR,
- "Unable to allocate memory for the receive descriptor ring\n");
- return -ENOMEM;
- }
-
- rxdr->ps_page_dma = kcalloc(rxdr->count,
- sizeof(struct e1000_ps_page_dma),
- GFP_KERNEL);
- if (!rxdr->ps_page_dma) {
- vfree(rxdr->buffer_info);
- kfree(rxdr->ps_page);
- DPRINTK(PROBE, ERR,
- "Unable to allocate memory for the receive descriptor ring\n");
- return -ENOMEM;
- }
-
if (hw->mac_type <= e1000_82547_rev_2)
desc_len = sizeof(struct e1000_rx_desc);
else
@@ -1852,8 +1825,6 @@ static int e1000_setup_rx_resources(struct e1000_adapter *adapter,
"Unable to allocate memory for the receive descriptor ring\n");
setup_rx_desc_die:
vfree(rxdr->buffer_info);
- kfree(rxdr->ps_page);
- kfree(rxdr->ps_page_dma);
return -ENOMEM;
}

@@ -1932,11 +1903,7 @@ int e1000_setup_all_rx_resources(struct e1000_adapter *adapter)
static void e1000_setup_rctl(struct e1000_adapter *adapter)
{
struct e1000_hw *hw = &adapter->hw;
- u32 rctl, rfctl;
- u32 psrctl = 0;
-#ifndef CONFIG_E1000_DISABLE_PACKET_SPLIT
- u32 pages = 0;
-#endif
+ u32 rctl;

rctl = er32(RCTL);

@@ -1988,55 +1955,6 @@ static void e1000_setup_rctl(struct e1000_adapter *adapter)
break;
}

-#ifndef CONFIG_E1000_DISABLE_PACKET_SPLIT
- /* 82571 and greater support packet-split where the protocol
- * header is placed in skb->data and the packet data is
- * placed in pages hanging off of skb_shinfo(skb)->nr_frags.
- * In the case of a non-split, skb->data is linearly filled,
- * followed by the page buffers. Therefore, skb->data is
- * sized to hold the largest protocol header.
- */
- /* allocations using alloc_page take too long for regular MTU
- * so only enable packet split for jumbo frames */
- pages = PAGE_USE_COUNT(adapter->netdev->mtu);
- if ((hw->mac_type >= e1000_82571) && (pages <= 3) &&
- PAGE_SIZE <= 16384 && (rctl & E1000_RCTL_LPE))
- adapter->rx_ps_pages = pages;
- else
- adapter->rx_ps_pages = 0;
-#endif
- if (adapter->rx_ps_pages) {
- /* Configure extra packet-split registers */
- rfctl = er32(RFCTL);
- rfctl |= E1000_RFCTL_EXTEN;
- /* disable packet split support for IPv6 extension headers,
- * because some malformed IPv6 headers can hang the RX */
- rfctl |= (E1000_RFCTL_IPV6_EX_DIS |
- E1000_RFCTL_NEW_IPV6_EXT_DIS);
-
- ew32(RFCTL, rfctl);
-
- rctl |= E1000_RCTL_DTYP_PS;
-
- psrctl |= adapter->rx_ps_bsize0 >>
- E1000_PSRCTL_BSIZE0_SHIFT;
-
- switch (adapter->rx_ps_pages) {
- case 3:
- psrctl |= PAGE_SIZE <<
- E1000_PSRCTL_BSIZE3_SHIFT;
- case 2:
- psrctl |= PAGE_SIZE <<
- E1000_PSRCTL_BSIZE2_SHIFT;
- case 1:
- psrctl |= PAGE_SIZE >>
- E1000_PSRCTL_BSIZE1_SHIFT;
- break;
- }
-
- ew32(PSRCTL, psrctl);
- }
-
ew32(RCTL, rctl);
}

@@ -2053,18 +1971,10 @@ static void e1000_configure_rx(struct e1000_adapter *adapter)
struct e1000_hw *hw = &adapter->hw;
u32 rdlen, rctl, rxcsum, ctrl_ext;

- if (adapter->rx_ps_pages) {
- /* this is a 32 byte descriptor */
- rdlen = adapter->rx_ring[0].count *
- sizeof(union e1000_rx_desc_packet_split);
- adapter->clean_rx = e1000_clean_rx_irq_ps;
- adapter->alloc_rx_buf = e1000_alloc_rx_buffers_ps;
- } else {
- rdlen = adapter->rx_ring[0].count *
- sizeof(struct e1000_rx_desc);
- adapter->clean_rx = e1000_clean_rx_irq;
- adapter->alloc_rx_buf = e1000_alloc_rx_buffers;
- }
+ rdlen = adapter->rx_ring[0].count *
+ sizeof(struct e1000_rx_desc);
+ adapter->clean_rx = e1000_clean_rx_irq;
+ adapter->alloc_rx_buf = e1000_alloc_rx_buffers;

/* disable receives while setting up the descriptors */
rctl = er32(RCTL);
@@ -2109,28 +2019,14 @@ static void e1000_configure_rx(struct e1000_adapter *adapter)
/* Enable 82543 Receive Checksum Offload for TCP and UDP */
if (hw->mac_type >= e1000_82543) {
rxcsum = er32(RXCSUM);
- if (adapter->rx_csum) {
+ if (adapter->rx_csum)
rxcsum |= E1000_RXCSUM_TUOFL;
-
- /* Enable 82571 IPv4 payload checksum for UDP fragments
- * Must be used in conjunction with packet-split. */
- if ((hw->mac_type >= e1000_82571) &&
- (adapter->rx_ps_pages)) {
- rxcsum |= E1000_RXCSUM_IPPCSE;
- }
- } else {
- rxcsum &= ~E1000_RXCSUM_TUOFL;
+ else
/* don't need to clear IPPCSE as it defaults to 0 */
- }
+ rxcsum &= ~E1000_RXCSUM_TUOFL;
ew32(RXCSUM, rxcsum);
}

- /* enable early receives on 82573, only takes effect if using > 2048
- * byte total frame size. for example only for jumbo frames */
-#define E1000_ERT_2048 0x100
- if (hw->mac_type == e1000_82573)
- ew32(ERT, E1000_ERT_2048);
-
/* Enable Receives */
ew32(RCTL, rctl);
}
@@ -2256,10 +2152,6 @@ static void e1000_free_rx_resources(struct e1000_adapter *adapter,

vfree(rx_ring->buffer_info);
rx_ring->buffer_info = NULL;
- kfree(rx_ring->ps_page);
- rx_ring->ps_page = NULL;
- kfree(rx_ring->ps_page_dma);
- rx_ring->ps_page_dma = NULL;

pci_free_consistent(pdev, rx_ring->size, rx_ring->desc, rx_ring->dma);

@@ -2292,11 +2184,9 @@ static void e1000_clean_rx_ring(struct e1000_adapter *adapter,
{
struct e1000_hw *hw = &adapter->hw;
struct e1000_buffer *buffer_info;
- struct e1000_ps_page *ps_page;
- struct e1000_ps_page_dma *ps_page_dma;
struct pci_dev *pdev = adapter->pdev;
unsigned long size;
- unsigned int i, j;
+ unsigned int i;

/* Free all the Rx ring sk_buffs */
for (i = 0; i < rx_ring->count; i++) {
@@ -2310,25 +2200,10 @@ static void e1000_clean_rx_ring(struct e1000_adapter *adapter,
dev_kfree_skb(buffer_info->skb);
buffer_info->skb = NULL;
}
- ps_page = &rx_ring->ps_page[i];
- ps_page_dma = &rx_ring->ps_page_dma[i];
- for (j = 0; j < adapter->rx_ps_pages; j++) {
- if (!ps_page->ps_page[j]) break;
- pci_unmap_page(pdev,
- ps_page_dma->ps_page_dma[j],
- PAGE_SIZE, PCI_DMA_FROMDEVICE);
- ps_page_dma->ps_page_dma[j] = 0;
- put_page(ps_page->ps_page[j]);
- ps_page->ps_page[j] = NULL;
- }
}

size = sizeof(struct e1000_buffer) * rx_ring->count;
memset(rx_ring->buffer_info, 0, size);
- size = sizeof(struct e1000_ps_page) * rx_ring->count;
- memset(rx_ring->ps_page, 0, size);
- size = sizeof(struct e1000_ps_page_dma) * rx_ring->count;
- memset(rx_ring->ps_page_dma, 0, size);

/* Zero out the descriptor ring */

@@ -4235,181 +4110,6 @@ next_desc:
}

/**
- * e1000_clean_rx_irq_ps - Send received data up the network stack; packet split
- * @adapter: board private structure
- **/
-
-static bool e1000_clean_rx_irq_ps(struct e1000_adapter *adapter,
- struct e1000_rx_ring *rx_ring,
- int *work_done, int work_to_do)
-{
- union e1000_rx_desc_packet_split *rx_desc, *next_rxd;
- struct net_device *netdev = adapter->netdev;
- struct pci_dev *pdev = adapter->pdev;
- struct e1000_buffer *buffer_info, *next_buffer;
- struct e1000_ps_page *ps_page;
- struct e1000_ps_page_dma *ps_page_dma;
- struct sk_buff *skb;
- unsigned int i, j;
- u32 length, staterr;
- int cleaned_count = 0;
- bool cleaned = false;
- unsigned int total_rx_bytes=0, total_rx_packets=0;
-
- i = rx_ring->next_to_clean;
- rx_desc = E1000_RX_DESC_PS(*rx_ring, i);
- staterr = le32_to_cpu(rx_desc->wb.middle.status_error);
- buffer_info = &rx_ring->buffer_info[i];
-
- while (staterr & E1000_RXD_STAT_DD) {
- ps_page = &rx_ring->ps_page[i];
- ps_page_dma = &rx_ring->ps_page_dma[i];
-
- if (unlikely(*work_done >= work_to_do))
- break;
- (*work_done)++;
-
- skb = buffer_info->skb;
-
- /* in the packet split case this is header only */
- prefetch(skb->data - NET_IP_ALIGN);
-
- if (++i == rx_ring->count) i = 0;
- next_rxd = E1000_RX_DESC_PS(*rx_ring, i);
- prefetch(next_rxd);
-
- next_buffer = &rx_ring->buffer_info[i];
-
- cleaned = true;
- cleaned_count++;
- pci_unmap_single(pdev, buffer_info->dma,
- buffer_info->length,
- PCI_DMA_FROMDEVICE);
-
- if (unlikely(!(staterr & E1000_RXD_STAT_EOP))) {
- E1000_DBG("%s: Packet Split buffers didn't pick up"
- " the full packet\n", netdev->name);
- dev_kfree_skb_irq(skb);
- goto next_desc;
- }
-
- if (unlikely(staterr & E1000_RXDEXT_ERR_FRAME_ERR_MASK)) {
- dev_kfree_skb_irq(skb);
- goto next_desc;
- }
-
- length = le16_to_cpu(rx_desc->wb.middle.length0);
-
- if (unlikely(!length)) {
- E1000_DBG("%s: Last part of the packet spanning"
- " multiple descriptors\n", netdev->name);
- dev_kfree_skb_irq(skb);
- goto next_desc;
- }
-
- /* Good Receive */
- skb_put(skb, length);
-
- {
- /* this looks ugly, but it seems compiler issues make it
- more efficient than reusing j */
- int l1 = le16_to_cpu(rx_desc->wb.upper.length[0]);
-
- /* page alloc/put takes too long and effects small packet
- * throughput, so unsplit small packets and save the alloc/put*/
- if (l1 && (l1 <= copybreak) && ((length + l1) <= adapter->rx_ps_bsize0)) {
- u8 *vaddr;
- /* there is no documentation about how to call
- * kmap_atomic, so we can't hold the mapping
- * very long */
- pci_dma_sync_single_for_cpu(pdev,
- ps_page_dma->ps_page_dma[0],
- PAGE_SIZE,
- PCI_DMA_FROMDEVICE);
- vaddr = kmap_atomic(ps_page->ps_page[0],
- KM_SKB_DATA_SOFTIRQ);
- memcpy(skb_tail_pointer(skb), vaddr, l1);
- kunmap_atomic(vaddr, KM_SKB_DATA_SOFTIRQ);
- pci_dma_sync_single_for_device(pdev,
- ps_page_dma->ps_page_dma[0],
- PAGE_SIZE, PCI_DMA_FROMDEVICE);
- /* remove the CRC */
- l1 -= 4;
- skb_put(skb, l1);
- goto copydone;
- } /* if */
- }
-
- for (j = 0; j < adapter->rx_ps_pages; j++) {
- length = le16_to_cpu(rx_desc->wb.upper.length[j]);
- if (!length)
- break;
- pci_unmap_page(pdev, ps_page_dma->ps_page_dma[j],
- PAGE_SIZE, PCI_DMA_FROMDEVICE);
- ps_page_dma->ps_page_dma[j] = 0;
- skb_fill_page_desc(skb, j, ps_page->ps_page[j], 0,
- length);
- ps_page->ps_page[j] = NULL;
- skb->len += length;
- skb->data_len += length;
- skb->truesize += length;
- }
-
- /* strip the ethernet crc, problem is we're using pages now so
- * this whole operation can get a little cpu intensive */
- pskb_trim(skb, skb->len - 4);
-
-copydone:
- total_rx_bytes += skb->len;
- total_rx_packets++;
-
- e1000_rx_checksum(adapter, staterr,
- le16_to_cpu(rx_desc->wb.lower.hi_dword.csum_ip.csum), skb);
- skb->protocol = eth_type_trans(skb, netdev);
-
- if (likely(rx_desc->wb.upper.header_status &
- cpu_to_le16(E1000_RXDPS_HDRSTAT_HDRSP)))
- adapter->rx_hdr_split++;
-
- if (unlikely(adapter->vlgrp && (staterr & E1000_RXD_STAT_VP))) {
- vlan_hwaccel_receive_skb(skb, adapter->vlgrp,
- le16_to_cpu(rx_desc->wb.middle.vlan));
- } else {
- netif_receive_skb(skb);
- }
-
- netdev->last_rx = jiffies;
-
-next_desc:
- rx_desc->wb.middle.status_error &= cpu_to_le32(~0xFF);
- buffer_info->skb = NULL;
-
- /* return some buffers to hardware, one at a time is too slow */
- if (unlikely(cleaned_count >= E1000_RX_BUFFER_WRITE)) {
- adapter->alloc_rx_buf(adapter, rx_ring, cleaned_count);
- cleaned_count = 0;
- }
-
- /* use prefetched values */
- rx_desc = next_rxd;
- buffer_info = next_buffer;
-
- staterr = le32_to_cpu(rx_desc->wb.middle.status_error);
- }
- rx_ring->next_to_clean = i;
-
- cleaned_count = E1000_DESC_UNUSED(rx_ring);
- if (cleaned_count)
- adapter->alloc_rx_buf(adapter, rx_ring, cleaned_count);
-
- adapter->total_rx_packets += total_rx_packets;
- adapter->total_rx_bytes += total_rx_bytes;
- adapter->net_stats.rx_bytes += total_rx_bytes;
- adapter->net_stats.rx_packets += total_rx_packets;
- return cleaned;
-}
-
-/**
* e1000_alloc_rx_buffers - Replace used receive buffers; legacy & extended
* @adapter: address of board private structure
**/
@@ -4521,104 +4221,6 @@ map_skb:
}

/**
- * e1000_alloc_rx_buffers_ps - Replace used receive buffers; packet split
- * @adapter: address of board private structure
- **/
-
-static void e1000_alloc_rx_buffers_ps(struct e1000_adapter *adapter,
- struct e1000_rx_ring *rx_ring,
- int cleaned_count)
-{
- struct e1000_hw *hw = &adapter->hw;
- struct net_device *netdev = adapter->netdev;
- struct pci_dev *pdev = adapter->pdev;
- union e1000_rx_desc_packet_split *rx_desc;
- struct e1000_buffer *buffer_info;
- struct e1000_ps_page *ps_page;
- struct e1000_ps_page_dma *ps_page_dma;
- struct sk_buff *skb;
- unsigned int i, j;
-
- i = rx_ring->next_to_use;
- buffer_info = &rx_ring->buffer_info[i];
- ps_page = &rx_ring->ps_page[i];
- ps_page_dma = &rx_ring->ps_page_dma[i];
-
- while (cleaned_count--) {
- rx_desc = E1000_RX_DESC_PS(*rx_ring, i);
-
- for (j = 0; j < PS_PAGE_BUFFERS; j++) {
- if (j < adapter->rx_ps_pages) {
- if (likely(!ps_page->ps_page[j])) {
- ps_page->ps_page[j] =
- alloc_page(GFP_ATOMIC);
- 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],
- 0, PAGE_SIZE,
- PCI_DMA_FROMDEVICE);
- }
- /* Refresh the desc even if buffer_addrs didn't
- * change because each write-back erases
- * this info.
- */
- rx_desc->read.buffer_addr[j+1] =
- cpu_to_le64(ps_page_dma->ps_page_dma[j]);
- } else
- rx_desc->read.buffer_addr[j+1] = ~cpu_to_le64(0);
- }
-
- skb = netdev_alloc_skb(netdev,
- adapter->rx_ps_bsize0 + NET_IP_ALIGN);
-
- 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
- * the 14 byte MAC header is removed
- */
- skb_reserve(skb, NET_IP_ALIGN);
-
- buffer_info->skb = skb;
- buffer_info->length = adapter->rx_ps_bsize0;
- buffer_info->dma = pci_map_single(pdev, skb->data,
- adapter->rx_ps_bsize0,
- PCI_DMA_FROMDEVICE);
-
- rx_desc->read.buffer_addr[0] = cpu_to_le64(buffer_info->dma);
-
- if (unlikely(++i == rx_ring->count)) i = 0;
- buffer_info = &rx_ring->buffer_info[i];
- ps_page = &rx_ring->ps_page[i];
- ps_page_dma = &rx_ring->ps_page_dma[i];
- }
-
-no_buffers:
- 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, hw->hw_addr + rx_ring->rdt);
- }
-}
-
-/**
* e1000_smartspeed - Workaround for SmartSpeed on 82541 and 82547 controllers.
* @adapter:
**/

\
 
 \ /
  Last update: 2008-09-16 22:05    [from the cache]
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