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Commit 981734a7 authored by Scott Feldman's avatar Scott Feldman Committed by Linus Torvalds
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[e1000] s/int/unsigned int/ for descriptor ring indexes 

* Perf cleanup: s/int/unsigned int/ for descriptor ring indexes
  [suggestion by Jeff Garzik].
* Perf cleanup: cache references to ring elements using local pointer
parent 5d8a1c0f
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Showing with 81 additions and 62 deletions
drivers/net/e1000/e1000_main.c
View file @ 981734a7
...@@ -977,35 +977,38 @@ e1000_free_tx_resources(struct e1000_adapter *adapter) ...@@ -977,35 +977,38 @@ e1000_free_tx_resources(struct e1000_adapter *adapter)
static void static void
e1000_clean_tx_ring(struct e1000_adapter *adapter) e1000_clean_tx_ring(struct e1000_adapter *adapter)
{ {
struct e1000_desc_ring *tx_ring = &adapter->tx_ring;
struct e1000_buffer *buffer_info;
struct pci_dev *pdev = adapter->pdev; struct pci_dev *pdev = adapter->pdev;
unsigned long size; unsigned long size;
int i; unsigned int i;
/* Free all the Tx ring sk_buffs */ /* Free all the Tx ring sk_buffs */
for(i = 0; i < adapter->tx_ring.count; i++) { for(i = 0; i < tx_ring->count; i++) {
if(adapter->tx_ring.buffer_info[i].skb) { buffer_info = &tx_ring->buffer_info[i];
if(buffer_info->skb) {
pci_unmap_page(pdev, pci_unmap_page(pdev,
adapter->tx_ring.buffer_info[i].dma, buffer_info->dma,
adapter->tx_ring.buffer_info[i].length, buffer_info->length,
PCI_DMA_TODEVICE); PCI_DMA_TODEVICE);
dev_kfree_skb(adapter->tx_ring.buffer_info[i].skb); dev_kfree_skb(buffer_info->skb);
adapter->tx_ring.buffer_info[i].skb = NULL; buffer_info->skb = NULL;
} }
} }
size = sizeof(struct e1000_buffer) * adapter->tx_ring.count; size = sizeof(struct e1000_buffer) * tx_ring->count;
memset(adapter->tx_ring.buffer_info, 0, size); memset(tx_ring->buffer_info, 0, size);
/* Zero out the descriptor ring */ /* Zero out the descriptor ring */
memset(adapter->tx_ring.desc, 0, adapter->tx_ring.size); memset(tx_ring->desc, 0, tx_ring->size);
adapter->tx_ring.next_to_use = 0; tx_ring->next_to_use = 0;
adapter->tx_ring.next_to_clean = 0; tx_ring->next_to_clean = 0;
E1000_WRITE_REG(&adapter->hw, TDH, 0); E1000_WRITE_REG(&adapter->hw, TDH, 0);
E1000_WRITE_REG(&adapter->hw, TDT, 0); E1000_WRITE_REG(&adapter->hw, TDT, 0);
...@@ -1021,17 +1024,17 @@ e1000_clean_tx_ring(struct e1000_adapter *adapter) ...@@ -1021,17 +1024,17 @@ e1000_clean_tx_ring(struct e1000_adapter *adapter)
static void static void
e1000_free_rx_resources(struct e1000_adapter *adapter) e1000_free_rx_resources(struct e1000_adapter *adapter)
{ {
struct e1000_desc_ring *rx_ring = &adapter->rx_ring;
struct pci_dev *pdev = adapter->pdev; struct pci_dev *pdev = adapter->pdev;
e1000_clean_rx_ring(adapter); e1000_clean_rx_ring(adapter);
kfree(adapter->rx_ring.buffer_info); kfree(rx_ring->buffer_info);
adapter->rx_ring.buffer_info = NULL; rx_ring->buffer_info = NULL;
pci_free_consistent(pdev, adapter->rx_ring.size, pci_free_consistent(pdev, rx_ring->size, rx_ring->desc, rx_ring->dma);
adapter->rx_ring.desc, adapter->rx_ring.dma);
adapter->rx_ring.desc = NULL; rx_ring->desc = NULL;
} }
/** /**
...@@ -1042,35 +1045,38 @@ e1000_free_rx_resources(struct e1000_adapter *adapter) ...@@ -1042,35 +1045,38 @@ e1000_free_rx_resources(struct e1000_adapter *adapter)
static void static void
e1000_clean_rx_ring(struct e1000_adapter *adapter) e1000_clean_rx_ring(struct e1000_adapter *adapter)
{ {
struct e1000_desc_ring *rx_ring = &adapter->rx_ring;
struct e1000_buffer *buffer_info;
struct pci_dev *pdev = adapter->pdev; struct pci_dev *pdev = adapter->pdev;
unsigned long size; unsigned long size;
int i; unsigned int i;
/* Free all the Rx ring sk_buffs */ /* Free all the Rx ring sk_buffs */
for(i = 0; i < adapter->rx_ring.count; i++) { for(i = 0; i < rx_ring->count; i++) {
if(adapter->rx_ring.buffer_info[i].skb) { buffer_info = &rx_ring->buffer_info[i];
if(buffer_info->skb) {
pci_unmap_single(pdev, pci_unmap_single(pdev,
adapter->rx_ring.buffer_info[i].dma, buffer_info->dma,
adapter->rx_ring.buffer_info[i].length, buffer_info->length,
PCI_DMA_FROMDEVICE); PCI_DMA_FROMDEVICE);
dev_kfree_skb(adapter->rx_ring.buffer_info[i].skb); dev_kfree_skb(buffer_info->skb);
adapter->rx_ring.buffer_info[i].skb = NULL; buffer_info->skb = NULL;
} }
} }
size = sizeof(struct e1000_buffer) * adapter->rx_ring.count; size = sizeof(struct e1000_buffer) * rx_ring->count;
memset(adapter->rx_ring.buffer_info, 0, size); memset(rx_ring->buffer_info, 0, size);
/* Zero out the descriptor ring */ /* Zero out the descriptor ring */
memset(adapter->rx_ring.desc, 0, adapter->rx_ring.size); memset(rx_ring->desc, 0, rx_ring->size);
adapter->rx_ring.next_to_clean = 0; rx_ring->next_to_clean = 0;
adapter->rx_ring.next_to_use = 0; rx_ring->next_to_use = 0;
E1000_WRITE_REG(&adapter->hw, RDH, 0); E1000_WRITE_REG(&adapter->hw, RDH, 0);
E1000_WRITE_REG(&adapter->hw, RDT, 0); E1000_WRITE_REG(&adapter->hw, RDT, 0);
...@@ -1320,7 +1326,7 @@ e1000_watchdog(unsigned long data) ...@@ -1320,7 +1326,7 @@ e1000_watchdog(unsigned long data)
struct e1000_adapter *adapter = (struct e1000_adapter *) data; struct e1000_adapter *adapter = (struct e1000_adapter *) data;
struct net_device *netdev = adapter->netdev; struct net_device *netdev = adapter->netdev;
struct e1000_desc_ring *txdr = &adapter->tx_ring; struct e1000_desc_ring *txdr = &adapter->tx_ring;
int i; unsigned int i;
e1000_check_for_link(&adapter->hw); e1000_check_for_link(&adapter->hw);
...@@ -1406,7 +1412,7 @@ e1000_tso(struct e1000_adapter *adapter, struct sk_buff *skb) ...@@ -1406,7 +1412,7 @@ e1000_tso(struct e1000_adapter *adapter, struct sk_buff *skb)
{ {
#ifdef NETIF_F_TSO #ifdef NETIF_F_TSO
struct e1000_context_desc *context_desc; struct e1000_context_desc *context_desc;
int i; unsigned int i;
uint8_t ipcss, ipcso, tucss, tucso, hdr_len; uint8_t ipcss, ipcso, tucss, tucso, hdr_len;
uint16_t ipcse, tucse, mss; uint16_t ipcse, tucse, mss;
...@@ -1457,7 +1463,7 @@ static inline boolean_t ...@@ -1457,7 +1463,7 @@ static inline boolean_t
e1000_tx_csum(struct e1000_adapter *adapter, struct sk_buff *skb) e1000_tx_csum(struct e1000_adapter *adapter, struct sk_buff *skb)
{ {
struct e1000_context_desc *context_desc; struct e1000_context_desc *context_desc;
int i; unsigned int i;
uint8_t css, cso; uint8_t css, cso;
if(skb->ip_summed == CHECKSUM_HW) { if(skb->ip_summed == CHECKSUM_HW) {
...@@ -1490,18 +1496,21 @@ e1000_tx_map(struct e1000_adapter *adapter, struct sk_buff *skb, ...@@ -1490,18 +1496,21 @@ e1000_tx_map(struct e1000_adapter *adapter, struct sk_buff *skb,
unsigned int first) unsigned int first)
{ {
struct e1000_desc_ring *tx_ring = &adapter->tx_ring; struct e1000_desc_ring *tx_ring = &adapter->tx_ring;
int len = skb->len, offset = 0, size, count = 0, i; struct e1000_buffer *buffer_info;
int len = skb->len;
unsigned int offset = 0, size, count = 0, i;
#ifdef NETIF_F_TSO #ifdef NETIF_F_TSO
int tso = skb_shinfo(skb)->tso_size; unsigned int tso = skb_shinfo(skb)->tso_size;
#endif #endif
int nr_frags = skb_shinfo(skb)->nr_frags; unsigned int nr_frags = skb_shinfo(skb)->nr_frags;
int f; unsigned int f;
len -= skb->data_len; len -= skb->data_len;
i = tx_ring->next_to_use; i = tx_ring->next_to_use;
while(len) { while(len) {
buffer_info = &tx_ring->buffer_info[i];
size = min(len, E1000_MAX_DATA_PER_TXD); size = min(len, E1000_MAX_DATA_PER_TXD);
#ifdef NETIF_F_TSO #ifdef NETIF_F_TSO
/* Workaround for premature desc write-backs /* Workaround for premature desc write-backs
...@@ -1509,13 +1518,13 @@ e1000_tx_map(struct e1000_adapter *adapter, struct sk_buff *skb, ...@@ -1509,13 +1518,13 @@ e1000_tx_map(struct e1000_adapter *adapter, struct sk_buff *skb,
if(tso && !nr_frags && size == len && size > 4) if(tso && !nr_frags && size == len && size > 4)
size -= 4; size -= 4;
#endif #endif
tx_ring->buffer_info[i].length = size; buffer_info->length = size;
tx_ring->buffer_info[i].dma = buffer_info->dma =
pci_map_single(adapter->pdev, pci_map_single(adapter->pdev,
skb->data + offset, skb->data + offset,
size, size,
PCI_DMA_TODEVICE); PCI_DMA_TODEVICE);
tx_ring->buffer_info[i].time_stamp = jiffies; buffer_info->time_stamp = jiffies;
len -= size; len -= size;
offset += size; offset += size;
...@@ -1531,6 +1540,7 @@ e1000_tx_map(struct e1000_adapter *adapter, struct sk_buff *skb, ...@@ -1531,6 +1540,7 @@ e1000_tx_map(struct e1000_adapter *adapter, struct sk_buff *skb,
offset = 0; offset = 0;
while(len) { while(len) {
buffer_info = &tx_ring->buffer_info[i];
size = min(len, E1000_MAX_DATA_PER_TXD); size = min(len, E1000_MAX_DATA_PER_TXD);
#ifdef NETIF_F_TSO #ifdef NETIF_F_TSO
/* Workaround for premature desc write-backs /* Workaround for premature desc write-backs
...@@ -1538,14 +1548,14 @@ e1000_tx_map(struct e1000_adapter *adapter, struct sk_buff *skb, ...@@ -1538,14 +1548,14 @@ e1000_tx_map(struct e1000_adapter *adapter, struct sk_buff *skb,
if(tso && f == (nr_frags-1) && size == len && size > 4) if(tso && f == (nr_frags-1) && size == len && size > 4)
size -= 4; size -= 4;
#endif #endif
tx_ring->buffer_info[i].length = size; buffer_info->length = size;
tx_ring->buffer_info[i].dma = buffer_info->dma =
pci_map_page(adapter->pdev, pci_map_page(adapter->pdev,
frag->page, frag->page,
frag->page_offset + offset, frag->page_offset + offset,
size, size,
PCI_DMA_TODEVICE); PCI_DMA_TODEVICE);
tx_ring->buffer_info[i].time_stamp = jiffies; buffer_info->time_stamp = jiffies;
len -= size; len -= size;
offset += size; offset += size;
...@@ -1553,7 +1563,7 @@ e1000_tx_map(struct e1000_adapter *adapter, struct sk_buff *skb, ...@@ -1553,7 +1563,7 @@ e1000_tx_map(struct e1000_adapter *adapter, struct sk_buff *skb,
if(++i == tx_ring->count) i = 0; if(++i == tx_ring->count) i = 0;
} }
} }
if(--i < 0) i = tx_ring->count - 1; i = (i == 0) ? tx_ring->count - 1 : i - 1;
tx_ring->buffer_info[i].skb = skb; tx_ring->buffer_info[i].skb = skb;
tx_ring->buffer_info[first].next_to_watch = i; tx_ring->buffer_info[first].next_to_watch = i;
...@@ -1565,8 +1575,9 @@ e1000_tx_queue(struct e1000_adapter *adapter, int count, int tx_flags) ...@@ -1565,8 +1575,9 @@ e1000_tx_queue(struct e1000_adapter *adapter, int count, int tx_flags)
{ {
struct e1000_desc_ring *tx_ring = &adapter->tx_ring; struct e1000_desc_ring *tx_ring = &adapter->tx_ring;
struct e1000_tx_desc *tx_desc = NULL; struct e1000_tx_desc *tx_desc = NULL;
struct e1000_buffer *buffer_info;
uint32_t txd_upper = 0, txd_lower = E1000_TXD_CMD_IFCS; uint32_t txd_upper = 0, txd_lower = E1000_TXD_CMD_IFCS;
int i; unsigned int i;
if(tx_flags & E1000_TX_FLAGS_TSO) { if(tx_flags & E1000_TX_FLAGS_TSO) {
txd_lower |= E1000_TXD_CMD_DEXT | E1000_TXD_DTYP_D | txd_lower |= E1000_TXD_CMD_DEXT | E1000_TXD_DTYP_D |
...@@ -1587,10 +1598,11 @@ e1000_tx_queue(struct e1000_adapter *adapter, int count, int tx_flags) ...@@ -1587,10 +1598,11 @@ e1000_tx_queue(struct e1000_adapter *adapter, int count, int tx_flags)
i = tx_ring->next_to_use; i = tx_ring->next_to_use;
while(count--) { while(count--) {
buffer_info = &tx_ring->buffer_info[i];
tx_desc = E1000_TX_DESC(*tx_ring, i); tx_desc = E1000_TX_DESC(*tx_ring, i);
tx_desc->buffer_addr = cpu_to_le64(tx_ring->buffer_info[i].dma); tx_desc->buffer_addr = cpu_to_le64(buffer_info->dma);
tx_desc->lower.data = tx_desc->lower.data =
cpu_to_le32(txd_lower | tx_ring->buffer_info[i].length); cpu_to_le32(txd_lower | buffer_info->length);
tx_desc->upper.data = cpu_to_le32(txd_upper); tx_desc->upper.data = cpu_to_le32(txd_upper);
if(++i == tx_ring->count) i = 0; if(++i == tx_ring->count) i = 0;
} }
...@@ -1656,7 +1668,7 @@ e1000_xmit_frame(struct sk_buff *skb, struct net_device *netdev) ...@@ -1656,7 +1668,7 @@ e1000_xmit_frame(struct sk_buff *skb, struct net_device *netdev)
{ {
struct e1000_adapter *adapter = netdev->priv; struct e1000_adapter *adapter = netdev->priv;
unsigned int first; unsigned int first;
int tx_flags = 0; unsigned int tx_flags = 0;
if(skb->len <= 0) { if(skb->len <= 0) {
dev_kfree_skb_any(skb); dev_kfree_skb_any(skb);
...@@ -1968,7 +1980,7 @@ e1000_intr(int irq, void *data, struct pt_regs *regs) ...@@ -1968,7 +1980,7 @@ e1000_intr(int irq, void *data, struct pt_regs *regs)
struct e1000_adapter *adapter = netdev->priv; struct e1000_adapter *adapter = netdev->priv;
uint32_t icr = E1000_READ_REG(&adapter->hw, ICR); uint32_t icr = E1000_READ_REG(&adapter->hw, ICR);
#ifndef CONFIG_E1000_NAPI #ifndef CONFIG_E1000_NAPI
int i; unsigned int i;
#endif #endif
if(!icr) if(!icr)
...@@ -2040,7 +2052,8 @@ e1000_clean_tx_irq(struct e1000_adapter *adapter) ...@@ -2040,7 +2052,8 @@ e1000_clean_tx_irq(struct e1000_adapter *adapter)
struct pci_dev *pdev = adapter->pdev; struct pci_dev *pdev = adapter->pdev;
struct e1000_tx_desc *tx_desc, *eop_desc; struct e1000_tx_desc *tx_desc, *eop_desc;
struct e1000_buffer *buffer_info; struct e1000_buffer *buffer_info;
int i, eop, cleaned = FALSE; unsigned int i, eop;
boolean_t cleaned = FALSE;
i = tx_ring->next_to_clean; i = tx_ring->next_to_clean;
eop = tx_ring->buffer_info[i].next_to_watch; eop = tx_ring->buffer_info[i].next_to_watch;
...@@ -2106,16 +2119,19 @@ e1000_clean_rx_irq(struct e1000_adapter *adapter) ...@@ -2106,16 +2119,19 @@ e1000_clean_rx_irq(struct e1000_adapter *adapter)
struct net_device *netdev = adapter->netdev; struct net_device *netdev = adapter->netdev;
struct pci_dev *pdev = adapter->pdev; struct pci_dev *pdev = adapter->pdev;
struct e1000_rx_desc *rx_desc; struct e1000_rx_desc *rx_desc;
struct e1000_buffer *buffer_info;
struct sk_buff *skb; struct sk_buff *skb;
unsigned long flags; unsigned long flags;
uint32_t length; uint32_t length;
uint8_t last_byte; uint8_t last_byte;
int i, cleaned = FALSE; unsigned int i;
boolean_t cleaned = FALSE;
i = rx_ring->next_to_clean; i = rx_ring->next_to_clean;
rx_desc = E1000_RX_DESC(*rx_ring, i); rx_desc = E1000_RX_DESC(*rx_ring, i);
while(rx_desc->status & E1000_RXD_STAT_DD) { while(rx_desc->status & E1000_RXD_STAT_DD) {
buffer_info = &rx_ring->buffer_info[i];
#ifdef CONFIG_E1000_NAPI #ifdef CONFIG_E1000_NAPI
if(*work_done >= work_to_do) if(*work_done >= work_to_do)
...@@ -2127,11 +2143,11 @@ e1000_clean_rx_irq(struct e1000_adapter *adapter) ...@@ -2127,11 +2143,11 @@ e1000_clean_rx_irq(struct e1000_adapter *adapter)
cleaned = TRUE; cleaned = TRUE;
pci_unmap_single(pdev, pci_unmap_single(pdev,
rx_ring->buffer_info[i].dma, buffer_info->dma,
rx_ring->buffer_info[i].length, buffer_info->length,
PCI_DMA_FROMDEVICE); PCI_DMA_FROMDEVICE);
skb = rx_ring->buffer_info[i].skb; skb = buffer_info->skb;
length = le16_to_cpu(rx_desc->length); length = le16_to_cpu(rx_desc->length);
if(!(rx_desc->status & E1000_RXD_STAT_EOP)) { if(!(rx_desc->status & E1000_RXD_STAT_EOP)) {
...@@ -2142,7 +2158,7 @@ e1000_clean_rx_irq(struct e1000_adapter *adapter) ...@@ -2142,7 +2158,7 @@ e1000_clean_rx_irq(struct e1000_adapter *adapter)
dev_kfree_skb_irq(skb); dev_kfree_skb_irq(skb);
rx_desc->status = 0; rx_desc->status = 0;
rx_ring->buffer_info[i].skb = NULL; buffer_info->skb = NULL;
if(++i == rx_ring->count) i = 0; if(++i == rx_ring->count) i = 0;
...@@ -2170,7 +2186,7 @@ e1000_clean_rx_irq(struct e1000_adapter *adapter) ...@@ -2170,7 +2186,7 @@ e1000_clean_rx_irq(struct e1000_adapter *adapter)
dev_kfree_skb_irq(skb); dev_kfree_skb_irq(skb);
rx_desc->status = 0; rx_desc->status = 0;
rx_ring->buffer_info[i].skb = NULL; buffer_info->skb = NULL;
if(++i == rx_ring->count) i = 0; if(++i == rx_ring->count) i = 0;
...@@ -2206,7 +2222,7 @@ e1000_clean_rx_irq(struct e1000_adapter *adapter) ...@@ -2206,7 +2222,7 @@ e1000_clean_rx_irq(struct e1000_adapter *adapter)
netdev->last_rx = jiffies; netdev->last_rx = jiffies;
rx_desc->status = 0; rx_desc->status = 0;
rx_ring->buffer_info[i].skb = NULL; buffer_info->skb = NULL;
if(++i == rx_ring->count) i = 0; if(++i == rx_ring->count) i = 0;
...@@ -2232,13 +2248,15 @@ e1000_alloc_rx_buffers(struct e1000_adapter *adapter) ...@@ -2232,13 +2248,15 @@ e1000_alloc_rx_buffers(struct e1000_adapter *adapter)
struct net_device *netdev = adapter->netdev; struct net_device *netdev = adapter->netdev;
struct pci_dev *pdev = adapter->pdev; struct pci_dev *pdev = adapter->pdev;
struct e1000_rx_desc *rx_desc; struct e1000_rx_desc *rx_desc;
struct e1000_buffer *buffer_info;
struct sk_buff *skb; struct sk_buff *skb;
int reserve_len = 2; int reserve_len = 2;
int i; unsigned int i;
i = rx_ring->next_to_use; i = rx_ring->next_to_use;
buffer_info = &rx_ring->buffer_info[i];
while(!rx_ring->buffer_info[i].skb) { while(!buffer_info->skb) {
rx_desc = E1000_RX_DESC(*rx_ring, i); rx_desc = E1000_RX_DESC(*rx_ring, i);
skb = dev_alloc_skb(adapter->rx_buffer_len + reserve_len); skb = dev_alloc_skb(adapter->rx_buffer_len + reserve_len);
...@@ -2256,15 +2274,15 @@ e1000_alloc_rx_buffers(struct e1000_adapter *adapter) ...@@ -2256,15 +2274,15 @@ e1000_alloc_rx_buffers(struct e1000_adapter *adapter)
skb->dev = netdev; skb->dev = netdev;
rx_ring->buffer_info[i].skb = skb; buffer_info->skb = skb;
rx_ring->buffer_info[i].length = adapter->rx_buffer_len; buffer_info->length = adapter->rx_buffer_len;
rx_ring->buffer_info[i].dma = buffer_info->dma =
pci_map_single(pdev, pci_map_single(pdev,
skb->data, skb->data,
adapter->rx_buffer_len, adapter->rx_buffer_len,
PCI_DMA_FROMDEVICE); PCI_DMA_FROMDEVICE);
rx_desc->buffer_addr = cpu_to_le64(rx_ring->buffer_info[i].dma); rx_desc->buffer_addr = cpu_to_le64(buffer_info->dma);
if((i & ~(E1000_RX_BUFFER_WRITE - 1)) == i) { if((i & ~(E1000_RX_BUFFER_WRITE - 1)) == i) {
/* Force memory writes to complete before letting h/w /* Force memory writes to complete before letting h/w
...@@ -2277,6 +2295,7 @@ e1000_alloc_rx_buffers(struct e1000_adapter *adapter) ...@@ -2277,6 +2295,7 @@ e1000_alloc_rx_buffers(struct e1000_adapter *adapter)
} }
if(++i == rx_ring->count) i = 0; if(++i == rx_ring->count) i = 0;
buffer_info = &rx_ring->buffer_info[i];
} }
rx_ring->next_to_use = i; rx_ring->next_to_use = i;
......
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