pasemi_mac: performance tweaks
pasemi_mac: performance tweaks * Seems like we do better with a smaller RX ring, probably because chances of still having the SKB cached are better * Const-ify variables to get better code generation and fewer reloads * Move prefetching around a little, and try to prefetch the whole SKB * Set NETIF_F_HIGHDMA * Misc other minor tweaks Signed-off-by: Olof Johansson <olof@lixom.net> Signed-off-by: Jeff Garzik <jeff@garzik.org>
This commit is contained in:
parent
34c20624ce
commit
5c15332bed
|
@ -56,7 +56,7 @@
|
|||
|
||||
|
||||
/* Must be a power of two */
|
||||
#define RX_RING_SIZE 4096
|
||||
#define RX_RING_SIZE 1024
|
||||
#define TX_RING_SIZE 4096
|
||||
|
||||
#define DEFAULT_MSG_ENABLE \
|
||||
|
@ -103,12 +103,12 @@ static void write_iob_reg(unsigned int reg, unsigned int val)
|
|||
pasemi_write_iob_reg(reg, val);
|
||||
}
|
||||
|
||||
static unsigned int read_mac_reg(struct pasemi_mac *mac, unsigned int reg)
|
||||
static unsigned int read_mac_reg(const struct pasemi_mac *mac, unsigned int reg)
|
||||
{
|
||||
return pasemi_read_mac_reg(mac->dma_if, reg);
|
||||
}
|
||||
|
||||
static void write_mac_reg(struct pasemi_mac *mac, unsigned int reg,
|
||||
static void write_mac_reg(const struct pasemi_mac *mac, unsigned int reg,
|
||||
unsigned int val)
|
||||
{
|
||||
pasemi_write_mac_reg(mac->dma_if, reg, val);
|
||||
|
@ -124,16 +124,26 @@ static void write_dma_reg(unsigned int reg, unsigned int val)
|
|||
pasemi_write_dma_reg(reg, val);
|
||||
}
|
||||
|
||||
static struct pasemi_mac_rxring *rx_ring(struct pasemi_mac *mac)
|
||||
static struct pasemi_mac_rxring *rx_ring(const struct pasemi_mac *mac)
|
||||
{
|
||||
return mac->rx;
|
||||
}
|
||||
|
||||
static struct pasemi_mac_txring *tx_ring(struct pasemi_mac *mac)
|
||||
static struct pasemi_mac_txring *tx_ring(const struct pasemi_mac *mac)
|
||||
{
|
||||
return mac->tx;
|
||||
}
|
||||
|
||||
static inline void prefetch_skb(const struct sk_buff *skb)
|
||||
{
|
||||
const void *d = skb;
|
||||
|
||||
prefetch(d);
|
||||
prefetch(d+64);
|
||||
prefetch(d+128);
|
||||
prefetch(d+192);
|
||||
}
|
||||
|
||||
static int mac_to_intf(struct pasemi_mac *mac)
|
||||
{
|
||||
struct pci_dev *pdev = mac->pdev;
|
||||
|
@ -211,19 +221,18 @@ static int pasemi_get_mac_addr(struct pasemi_mac *mac)
|
|||
|
||||
static int pasemi_mac_unmap_tx_skb(struct pasemi_mac *mac,
|
||||
struct sk_buff *skb,
|
||||
dma_addr_t *dmas)
|
||||
const dma_addr_t *dmas)
|
||||
{
|
||||
int f;
|
||||
int nfrags = skb_shinfo(skb)->nr_frags;
|
||||
struct pci_dev *pdev = mac->dma_pdev;
|
||||
|
||||
pci_unmap_single(mac->dma_pdev, dmas[0], skb_headlen(skb),
|
||||
PCI_DMA_TODEVICE);
|
||||
pci_unmap_single(pdev, dmas[0], skb_headlen(skb), PCI_DMA_TODEVICE);
|
||||
|
||||
for (f = 0; f < nfrags; f++) {
|
||||
skb_frag_t *frag = &skb_shinfo(skb)->frags[f];
|
||||
|
||||
pci_unmap_page(mac->dma_pdev, dmas[f+1], frag->size,
|
||||
PCI_DMA_TODEVICE);
|
||||
pci_unmap_page(pdev, dmas[f+1], frag->size, PCI_DMA_TODEVICE);
|
||||
}
|
||||
dev_kfree_skb_irq(skb);
|
||||
|
||||
|
@ -233,7 +242,7 @@ static int pasemi_mac_unmap_tx_skb(struct pasemi_mac *mac,
|
|||
return (nfrags + 3) & ~1;
|
||||
}
|
||||
|
||||
static int pasemi_mac_setup_rx_resources(struct net_device *dev)
|
||||
static int pasemi_mac_setup_rx_resources(const struct net_device *dev)
|
||||
{
|
||||
struct pasemi_mac_rxring *ring;
|
||||
struct pasemi_mac *mac = netdev_priv(dev);
|
||||
|
@ -277,7 +286,7 @@ static int pasemi_mac_setup_rx_resources(struct net_device *dev)
|
|||
PAS_DMA_RXCHAN_BASEU_BRBH(ring->chan.ring_dma >> 32) |
|
||||
PAS_DMA_RXCHAN_BASEU_SIZ(RX_RING_SIZE >> 3));
|
||||
|
||||
cfg = PAS_DMA_RXCHAN_CFG_HBU(1);
|
||||
cfg = PAS_DMA_RXCHAN_CFG_HBU(2);
|
||||
|
||||
if (translation_enabled())
|
||||
cfg |= PAS_DMA_RXCHAN_CFG_CTR;
|
||||
|
@ -291,7 +300,7 @@ static int pasemi_mac_setup_rx_resources(struct net_device *dev)
|
|||
PAS_DMA_RXINT_BASEU_BRBH(ring->buf_dma >> 32) |
|
||||
PAS_DMA_RXINT_BASEU_SIZ(RX_RING_SIZE >> 3));
|
||||
|
||||
cfg = PAS_DMA_RXINT_CFG_DHL(1) | PAS_DMA_RXINT_CFG_L2 |
|
||||
cfg = PAS_DMA_RXINT_CFG_DHL(2) | PAS_DMA_RXINT_CFG_L2 |
|
||||
PAS_DMA_RXINT_CFG_LW | PAS_DMA_RXINT_CFG_RBP |
|
||||
PAS_DMA_RXINT_CFG_HEN;
|
||||
|
||||
|
@ -316,7 +325,7 @@ out_chan:
|
|||
}
|
||||
|
||||
static struct pasemi_mac_txring *
|
||||
pasemi_mac_setup_tx_resources(struct net_device *dev)
|
||||
pasemi_mac_setup_tx_resources(const struct net_device *dev)
|
||||
{
|
||||
struct pasemi_mac *mac = netdev_priv(dev);
|
||||
u32 val;
|
||||
|
@ -439,9 +448,10 @@ static void pasemi_mac_free_rx_resources(struct pasemi_mac *mac)
|
|||
mac->rx = NULL;
|
||||
}
|
||||
|
||||
static void pasemi_mac_replenish_rx_ring(struct net_device *dev, int limit)
|
||||
static void pasemi_mac_replenish_rx_ring(const struct net_device *dev,
|
||||
const int limit)
|
||||
{
|
||||
struct pasemi_mac *mac = netdev_priv(dev);
|
||||
const struct pasemi_mac *mac = netdev_priv(dev);
|
||||
struct pasemi_mac_rxring *rx = rx_ring(mac);
|
||||
int fill, count;
|
||||
|
||||
|
@ -492,7 +502,7 @@ static void pasemi_mac_replenish_rx_ring(struct net_device *dev, int limit)
|
|||
(RX_RING_SIZE - 1);
|
||||
}
|
||||
|
||||
static void pasemi_mac_restart_rx_intr(struct pasemi_mac *mac)
|
||||
static void pasemi_mac_restart_rx_intr(const struct pasemi_mac *mac)
|
||||
{
|
||||
unsigned int reg, pcnt;
|
||||
/* Re-enable packet count interrupts: finally
|
||||
|
@ -506,7 +516,7 @@ static void pasemi_mac_restart_rx_intr(struct pasemi_mac *mac)
|
|||
write_iob_reg(PAS_IOB_DMA_RXCH_RESET(mac->rx->chan.chno), reg);
|
||||
}
|
||||
|
||||
static void pasemi_mac_restart_tx_intr(struct pasemi_mac *mac)
|
||||
static void pasemi_mac_restart_tx_intr(const struct pasemi_mac *mac)
|
||||
{
|
||||
unsigned int reg, pcnt;
|
||||
|
||||
|
@ -519,7 +529,8 @@ static void pasemi_mac_restart_tx_intr(struct pasemi_mac *mac)
|
|||
}
|
||||
|
||||
|
||||
static inline void pasemi_mac_rx_error(struct pasemi_mac *mac, u64 macrx)
|
||||
static inline void pasemi_mac_rx_error(const struct pasemi_mac *mac,
|
||||
const u64 macrx)
|
||||
{
|
||||
unsigned int rcmdsta, ccmdsta;
|
||||
struct pasemi_dmachan *chan = &rx_ring(mac)->chan;
|
||||
|
@ -537,7 +548,8 @@ static inline void pasemi_mac_rx_error(struct pasemi_mac *mac, u64 macrx)
|
|||
rcmdsta, ccmdsta);
|
||||
}
|
||||
|
||||
static inline void pasemi_mac_tx_error(struct pasemi_mac *mac, u64 mactx)
|
||||
static inline void pasemi_mac_tx_error(const struct pasemi_mac *mac,
|
||||
const u64 mactx)
|
||||
{
|
||||
unsigned int cmdsta;
|
||||
struct pasemi_dmachan *chan = &tx_ring(mac)->chan;
|
||||
|
@ -553,19 +565,22 @@ static inline void pasemi_mac_tx_error(struct pasemi_mac *mac, u64 mactx)
|
|||
printk(KERN_ERR "pasemi_mac: tcmdsta 0x%08x\n", cmdsta);
|
||||
}
|
||||
|
||||
static int pasemi_mac_clean_rx(struct pasemi_mac_rxring *rx, int limit)
|
||||
static int pasemi_mac_clean_rx(struct pasemi_mac_rxring *rx,
|
||||
const int limit)
|
||||
{
|
||||
struct pasemi_dmachan *chan = &rx->chan;
|
||||
const struct pasemi_dmachan *chan = &rx->chan;
|
||||
struct pasemi_mac *mac = rx->mac;
|
||||
struct pci_dev *pdev = mac->dma_pdev;
|
||||
unsigned int n;
|
||||
int count;
|
||||
int count, buf_index, tot_bytes, packets;
|
||||
struct pasemi_mac_buffer *info;
|
||||
struct sk_buff *skb;
|
||||
unsigned int len;
|
||||
u64 macrx;
|
||||
u64 macrx, eval;
|
||||
dma_addr_t dma;
|
||||
int buf_index;
|
||||
u64 eval;
|
||||
|
||||
tot_bytes = 0;
|
||||
packets = 0;
|
||||
|
||||
spin_lock(&rx->lock);
|
||||
|
||||
|
@ -575,6 +590,7 @@ static int pasemi_mac_clean_rx(struct pasemi_mac_rxring *rx, int limit)
|
|||
|
||||
for (count = 0; count < limit; count++) {
|
||||
macrx = RX_DESC(rx, n);
|
||||
prefetch(&RX_DESC(rx, n+4));
|
||||
|
||||
if ((macrx & XCT_MACRX_E) ||
|
||||
(*chan->status & PAS_STATUS_ERROR))
|
||||
|
@ -596,12 +612,12 @@ static int pasemi_mac_clean_rx(struct pasemi_mac_rxring *rx, int limit)
|
|||
|
||||
skb = info->skb;
|
||||
|
||||
prefetch(skb);
|
||||
prefetch(&skb->data_len);
|
||||
prefetch_skb(skb);
|
||||
|
||||
len = (macrx & XCT_MACRX_LLEN_M) >> XCT_MACRX_LLEN_S;
|
||||
|
||||
pci_unmap_single(mac->dma_pdev, dma, len, PCI_DMA_FROMDEVICE);
|
||||
pci_unmap_single(pdev, dma, BUF_SIZE-LOCAL_SKB_ALIGN,
|
||||
PCI_DMA_FROMDEVICE);
|
||||
|
||||
if (macrx & XCT_MACRX_CRC) {
|
||||
/* CRC error flagged */
|
||||
|
@ -628,9 +644,6 @@ static int pasemi_mac_clean_rx(struct pasemi_mac_rxring *rx, int limit)
|
|||
|
||||
info->dma = 0;
|
||||
|
||||
/* Don't include CRC */
|
||||
skb_put(skb, len-4);
|
||||
|
||||
if (likely((macrx & XCT_MACRX_HTY_M) == XCT_MACRX_HTY_IPV4_OK)) {
|
||||
skb->ip_summed = CHECKSUM_UNNECESSARY;
|
||||
skb->csum = (macrx & XCT_MACRX_CSUM_M) >>
|
||||
|
@ -638,8 +651,11 @@ static int pasemi_mac_clean_rx(struct pasemi_mac_rxring *rx, int limit)
|
|||
} else
|
||||
skb->ip_summed = CHECKSUM_NONE;
|
||||
|
||||
mac->netdev->stats.rx_bytes += len;
|
||||
mac->netdev->stats.rx_packets++;
|
||||
packets++;
|
||||
tot_bytes += len;
|
||||
|
||||
/* Don't include CRC */
|
||||
skb_put(skb, len-4);
|
||||
|
||||
skb->protocol = eth_type_trans(skb, mac->netdev);
|
||||
netif_receive_skb(skb);
|
||||
|
@ -672,6 +688,9 @@ next:
|
|||
|
||||
pasemi_mac_replenish_rx_ring(mac->netdev, count);
|
||||
|
||||
mac->netdev->stats.rx_bytes += tot_bytes;
|
||||
mac->netdev->stats.rx_packets += packets;
|
||||
|
||||
spin_unlock(&rx_ring(mac)->lock);
|
||||
|
||||
return count;
|
||||
|
@ -758,10 +777,10 @@ restart:
|
|||
|
||||
static irqreturn_t pasemi_mac_rx_intr(int irq, void *data)
|
||||
{
|
||||
struct pasemi_mac_rxring *rxring = data;
|
||||
const struct pasemi_mac_rxring *rxring = data;
|
||||
struct pasemi_mac *mac = rxring->mac;
|
||||
struct net_device *dev = mac->netdev;
|
||||
struct pasemi_dmachan *chan = &rxring->chan;
|
||||
const struct pasemi_dmachan *chan = &rxring->chan;
|
||||
unsigned int reg;
|
||||
|
||||
if (!(*chan->status & PAS_STATUS_CAUSE_M))
|
||||
|
@ -789,7 +808,7 @@ static irqreturn_t pasemi_mac_rx_intr(int irq, void *data)
|
|||
static irqreturn_t pasemi_mac_tx_intr(int irq, void *data)
|
||||
{
|
||||
struct pasemi_mac_txring *txring = data;
|
||||
struct pasemi_dmachan *chan = &txring->chan;
|
||||
const struct pasemi_dmachan *chan = &txring->chan;
|
||||
unsigned int reg, pcnt;
|
||||
|
||||
if (!(*chan->status & PAS_STATUS_CAUSE_M))
|
||||
|
@ -1158,6 +1177,7 @@ static int pasemi_mac_start_tx(struct sk_buff *skb, struct net_device *dev)
|
|||
unsigned int map_size[MAX_SKB_FRAGS+1];
|
||||
unsigned long flags;
|
||||
int i, nfrags;
|
||||
int fill;
|
||||
|
||||
dflags = XCT_MACTX_O | XCT_MACTX_ST | XCT_MACTX_CRC_PAD;
|
||||
|
||||
|
@ -1205,6 +1225,8 @@ static int pasemi_mac_start_tx(struct sk_buff *skb, struct net_device *dev)
|
|||
|
||||
spin_lock_irqsave(&txring->lock, flags);
|
||||
|
||||
fill = txring->next_to_fill;
|
||||
|
||||
/* Avoid stepping on the same cache line that the DMA controller
|
||||
* is currently about to send, so leave at least 8 words available.
|
||||
* Total free space needed is mactx + fragments + 8
|
||||
|
@ -1215,13 +1237,13 @@ static int pasemi_mac_start_tx(struct sk_buff *skb, struct net_device *dev)
|
|||
goto out_err;
|
||||
}
|
||||
|
||||
TX_DESC(txring, txring->next_to_fill) = mactx;
|
||||
txring->next_to_fill++;
|
||||
TX_DESC_INFO(txring, txring->next_to_fill).skb = skb;
|
||||
TX_DESC(txring, fill) = mactx;
|
||||
fill++;
|
||||
TX_DESC_INFO(txring, fill).skb = skb;
|
||||
for (i = 0; i <= nfrags; i++) {
|
||||
TX_DESC(txring, txring->next_to_fill+i) =
|
||||
TX_DESC(txring, fill+i) =
|
||||
XCT_PTR_LEN(map_size[i]) | XCT_PTR_ADDR(map[i]);
|
||||
TX_DESC_INFO(txring, txring->next_to_fill+i).dma = map[i];
|
||||
TX_DESC_INFO(txring, fill+i).dma = map[i];
|
||||
}
|
||||
|
||||
/* We have to add an even number of 8-byte entries to the ring
|
||||
|
@ -1231,8 +1253,7 @@ static int pasemi_mac_start_tx(struct sk_buff *skb, struct net_device *dev)
|
|||
if (nfrags & 1)
|
||||
nfrags++;
|
||||
|
||||
txring->next_to_fill = (txring->next_to_fill + nfrags + 1) &
|
||||
(TX_RING_SIZE-1);
|
||||
txring->next_to_fill = (fill + nfrags + 1) & (TX_RING_SIZE-1);
|
||||
|
||||
dev->stats.tx_packets++;
|
||||
dev->stats.tx_bytes += skb->len;
|
||||
|
@ -1255,7 +1276,7 @@ out_err_nolock:
|
|||
|
||||
static void pasemi_mac_set_rx_mode(struct net_device *dev)
|
||||
{
|
||||
struct pasemi_mac *mac = netdev_priv(dev);
|
||||
const struct pasemi_mac *mac = netdev_priv(dev);
|
||||
unsigned int flags;
|
||||
|
||||
flags = read_mac_reg(mac, PAS_MAC_CFG_PCFG);
|
||||
|
@ -1317,7 +1338,8 @@ pasemi_mac_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
|
|||
|
||||
netif_napi_add(dev, &mac->napi, pasemi_mac_poll, 64);
|
||||
|
||||
dev->features = NETIF_F_IP_CSUM | NETIF_F_LLTX | NETIF_F_SG;
|
||||
dev->features = NETIF_F_IP_CSUM | NETIF_F_LLTX | NETIF_F_SG |
|
||||
NETIF_F_HIGHDMA;
|
||||
|
||||
mac->dma_pdev = pci_get_device(PCI_VENDOR_ID_PASEMI, 0xa007, NULL);
|
||||
if (!mac->dma_pdev) {
|
||||
|
|
Loading…
Reference in New Issue