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linux-davinci-2.6.23
Commit b01867cb authored by Ayaz Abdulla's avatar Ayaz Abdulla Committed by Jeff Garzik
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forcedeth: rx data path optimization 

This patch optimizes the rx data paths and cleans up the code.
Signed-Off-By: default avatarAyaz Abdulla <aabdulla@nvidia.com>
Signed-off-by: default avatarJeff Garzik <jeff@garzik.org>
parent 445583b8
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Showing with 148 additions and 182 deletions
drivers/net/forcedeth.c
View file @ b01867cb
......@@ -1317,9 +1317,9 @@ static int nv_alloc_rx(struct net_device *dev)
np->put_rx.orig->buf = cpu_to_le32(np->put_rx_ctx->dma);
wmb();
np->put_rx.orig->flaglen = cpu_to_le32(np->rx_buf_sz | NV_RX_AVAIL);
if (np->put_rx.orig++ == np->last_rx.orig)
if (unlikely(np->put_rx.orig++ == np->last_rx.orig))
np->put_rx.orig = np->first_rx.orig;
if (np->put_rx_ctx++ == np->last_rx_ctx)
if (unlikely(np->put_rx_ctx++ == np->last_rx_ctx))
np->put_rx_ctx = np->first_rx_ctx;
} else {
return 1;
......@@ -1349,9 +1349,9 @@ static int nv_alloc_rx_optimized(struct net_device *dev)
np->put_rx.ex->buflow = cpu_to_le64(np->put_rx_ctx->dma) & 0x0FFFFFFFF;
wmb();
np->put_rx.ex->flaglen = cpu_to_le32(np->rx_buf_sz | NV_RX2_AVAIL);
if (np->put_rx.ex++ == np->last_rx.ex)
if (unlikely(np->put_rx.ex++ == np->last_rx.ex))
np->put_rx.ex = np->first_rx.ex;
if (np->put_rx_ctx++ == np->last_rx_ctx)
if (unlikely(np->put_rx_ctx++ == np->last_rx_ctx))
np->put_rx_ctx = np->first_rx_ctx;
} else {
return 1;
......@@ -2046,24 +2046,17 @@ static int nv_rx_process(struct net_device *dev, int limit)
{
struct fe_priv *np = netdev_priv(dev);
u32 flags;
u32 vlanflags = 0;
int count;
for (count = 0; count < limit; ++count) {
u32 rx_processed_cnt = 0;
struct sk_buff *skb;
int len;
if (np->get_rx.orig == np->put_rx.orig)
break; /* we scanned the whole ring - do not continue */
flags = le32_to_cpu(np->get_rx.orig->flaglen);
len = nv_descr_getlength(np->get_rx.orig, np->desc_ver);
while((np->get_rx.orig != np->put_rx.orig) &&
!((flags = le32_to_cpu(np->get_rx.orig->flaglen)) & NV_RX_AVAIL) &&
(rx_processed_cnt++ < limit)) {
dprintk(KERN_DEBUG "%s: nv_rx_process: flags 0x%x.\n",
dev->name, flags);
if (flags & NV_RX_AVAIL)
break; /* still owned by hardware, */
/*
* the packet is for us - immediately tear down the pci mapping.
* TODO: check if a prefetch of the first cacheline improves
......@@ -2087,35 +2080,9 @@ static int nv_rx_process(struct net_device *dev, int limit)
}
/* look at what we actually got: */
if (np->desc_ver == DESC_VER_1) {
if (!(flags & NV_RX_DESCRIPTORVALID)) {
dev_kfree_skb(skb);
goto next_pkt;
}
if (flags & NV_RX_ERROR) {
if (flags & NV_RX_MISSEDFRAME) {
np->stats.rx_missed_errors++;
np->stats.rx_errors++;
dev_kfree_skb(skb);
goto next_pkt;
}
if (flags & (NV_RX_ERROR1|NV_RX_ERROR2|NV_RX_ERROR3)) {
np->stats.rx_errors++;
dev_kfree_skb(skb);
goto next_pkt;
}
if (flags & NV_RX_CRCERR) {
np->stats.rx_crc_errors++;
np->stats.rx_errors++;
dev_kfree_skb(skb);
goto next_pkt;
}
if (flags & NV_RX_OVERFLOW) {
np->stats.rx_over_errors++;
np->stats.rx_errors++;
dev_kfree_skb(skb);
goto next_pkt;
}
if (likely(flags & NV_RX_DESCRIPTORVALID)) {
len = flags & LEN_MASK_V1;
if (unlikely(flags & NV_RX_ERROR)) {
if (flags & NV_RX_ERROR4) {
len = nv_getlen(dev, skb->data, len);
if (len < 0) {
......@@ -2124,37 +2091,33 @@ static int nv_rx_process(struct net_device *dev, int limit)
goto next_pkt;
}
}
/* framing errors are soft errors. */
if (flags & NV_RX_FRAMINGERR) {
/* framing errors are soft errors */
else if (flags & NV_RX_FRAMINGERR) {
if (flags & NV_RX_SUBSTRACT1) {
len--;
}
}
}
} else {
if (!(flags & NV_RX2_DESCRIPTORVALID)) {
dev_kfree_skb(skb);
goto next_pkt;
}
if (flags & NV_RX2_ERROR) {
if (flags & (NV_RX2_ERROR1|NV_RX2_ERROR2|NV_RX2_ERROR3)) {
np->stats.rx_errors++;
dev_kfree_skb(skb);
goto next_pkt;
}
if (flags & NV_RX2_CRCERR) {
/* the rest are hard errors */
else {
if (flags & NV_RX_MISSEDFRAME)
np->stats.rx_missed_errors++;
if (flags & NV_RX_CRCERR)
np->stats.rx_crc_errors++;
if (flags & NV_RX_OVERFLOW)
np->stats.rx_over_errors++;
np->stats.rx_errors++;
dev_kfree_skb(skb);
goto next_pkt;
}
if (flags & NV_RX2_OVERFLOW) {
np->stats.rx_over_errors++;
np->stats.rx_errors++;
}
} else {
dev_kfree_skb(skb);
goto next_pkt;
}
} else {
if (likely(flags & NV_RX2_DESCRIPTORVALID)) {
len = flags & LEN_MASK_V2;
if (unlikely(flags & NV_RX2_ERROR)) {
if (flags & NV_RX2_ERROR4) {
len = nv_getlen(dev, skb->data, len);
if (len < 0) {
......@@ -2164,23 +2127,34 @@ static int nv_rx_process(struct net_device *dev, int limit)
}
}
/* framing errors are soft errors */
if (flags & NV_RX2_FRAMINGERR) {
else if (flags & NV_RX2_FRAMINGERR) {
if (flags & NV_RX2_SUBSTRACT1) {
len--;
}
}
/* the rest are hard errors */
else {
if (flags & NV_RX2_CRCERR)
np->stats.rx_crc_errors++;
if (flags & NV_RX2_OVERFLOW)
np->stats.rx_over_errors++;
np->stats.rx_errors++;
dev_kfree_skb(skb);
goto next_pkt;
}
}
if (np->rx_csum) {
flags &= NV_RX2_CHECKSUMMASK;
if (flags == NV_RX2_CHECKSUMOK1 ||
flags == NV_RX2_CHECKSUMOK2 ||
flags == NV_RX2_CHECKSUMOK3) {
dprintk(KERN_DEBUG "%s: hw checksum hit!.\n", dev->name);
if ((flags & NV_RX2_CHECKSUMMASK) == NV_RX2_CHECKSUMOK2)/*ip and tcp */ {
skb->ip_summed = CHECKSUM_UNNECESSARY;
} else {
dprintk(KERN_DEBUG "%s: hwchecksum miss!.\n", dev->name);
if ((flags & NV_RX2_CHECKSUMMASK) == NV_RX2_CHECKSUMOK1 ||
(flags & NV_RX2_CHECKSUMMASK) == NV_RX2_CHECKSUMOK3) {
skb->ip_summed = CHECKSUM_UNNECESSARY;
}
}
} else {
dev_kfree_skb(skb);
goto next_pkt;
}
}
/* got a valid packet - forward it to the network core */
skb_put(skb, len);
......@@ -2188,29 +2162,21 @@ static int nv_rx_process(struct net_device *dev, int limit)
dprintk(KERN_DEBUG "%s: nv_rx_process: %d bytes, proto %d accepted.\n",
dev->name, len, skb->protocol);
#ifdef CONFIG_FORCEDETH_NAPI
if (np->vlangrp && (vlanflags & NV_RX3_VLAN_TAG_PRESENT))
vlan_hwaccel_receive_skb(skb, np->vlangrp,
vlanflags & NV_RX3_VLAN_TAG_MASK);
else
netif_receive_skb(skb);
#else
if (np->vlangrp && (vlanflags & NV_RX3_VLAN_TAG_PRESENT))
vlan_hwaccel_rx(skb, np->vlangrp,
vlanflags & NV_RX3_VLAN_TAG_MASK);
else
netif_rx(skb);
#endif
dev->last_rx = jiffies;
np->stats.rx_packets++;
np->stats.rx_bytes += len;
next_pkt:
if (np->get_rx.orig++ == np->last_rx.orig)
if (unlikely(np->get_rx.orig++ == np->last_rx.orig))
np->get_rx.orig = np->first_rx.orig;
if (np->get_rx_ctx++ == np->last_rx_ctx)
if (unlikely(np->get_rx_ctx++ == np->last_rx_ctx))
np->get_rx_ctx = np->first_rx_ctx;
}
return count;
return rx_processed_cnt;
}
static int nv_rx_process_optimized(struct net_device *dev, int limit)
......@@ -2218,24 +2184,17 @@ static int nv_rx_process_optimized(struct net_device *dev, int limit)
struct fe_priv *np = netdev_priv(dev);
u32 flags;
u32 vlanflags = 0;
int count;
for (count = 0; count < limit; ++count) {
u32 rx_processed_cnt = 0;
struct sk_buff *skb;
int len;
if (np->get_rx.ex == np->put_rx.ex)
break; /* we scanned the whole ring - do not continue */
flags = le32_to_cpu(np->get_rx.ex->flaglen);
len = nv_descr_getlength_ex(np->get_rx.ex, np->desc_ver);
vlanflags = le32_to_cpu(np->get_rx.ex->buflow);
while((np->get_rx.ex != np->put_rx.ex) &&
!((flags = le32_to_cpu(np->get_rx.ex->flaglen)) & NV_RX2_AVAIL) &&
(rx_processed_cnt++ < limit)) {
dprintk(KERN_DEBUG "%s: nv_rx_process_optimized: flags 0x%x.\n",
dev->name, flags);
if (flags & NV_RX_AVAIL)
break; /* still owned by hardware, */
/*
* the packet is for us - immediately tear down the pci mapping.
* TODO: check if a prefetch of the first cacheline improves
......@@ -2258,29 +2217,9 @@ static int nv_rx_process_optimized(struct net_device *dev, int limit)
dprintk("\n");
}
/* look at what we actually got: */
if (!(flags & NV_RX2_DESCRIPTORVALID)) {
dev_kfree_skb(skb);
goto next_pkt;
}
if (flags & NV_RX2_ERROR) {
if (flags & (NV_RX2_ERROR1|NV_RX2_ERROR2|NV_RX2_ERROR3)) {
np->stats.rx_errors++;
dev_kfree_skb(skb);
goto next_pkt;
}
if (flags & NV_RX2_CRCERR) {
np->stats.rx_crc_errors++;
np->stats.rx_errors++;
dev_kfree_skb(skb);
goto next_pkt;
}
if (flags & NV_RX2_OVERFLOW) {
np->stats.rx_over_errors++;
np->stats.rx_errors++;
dev_kfree_skb(skb);
goto next_pkt;
}
if (likely(flags & NV_RX2_DESCRIPTORVALID)) {
len = flags & LEN_MASK_V2;
if (unlikely(flags & NV_RX2_ERROR)) {
if (flags & NV_RX2_ERROR4) {
len = nv_getlen(dev, skb->data, len);
if (len < 0) {
......@@ -2290,52 +2229,79 @@ static int nv_rx_process_optimized(struct net_device *dev, int limit)
}
}
/* framing errors are soft errors */
if (flags & NV_RX2_FRAMINGERR) {
else if (flags & NV_RX2_FRAMINGERR) {
if (flags & NV_RX2_SUBSTRACT1) {
len--;
}
}
/* the rest are hard errors */
else {
if (flags & NV_RX2_CRCERR)
np->stats.rx_crc_errors++;
if (flags & NV_RX2_OVERFLOW)
np->stats.rx_over_errors++;
np->stats.rx_errors++;
dev_kfree_skb(skb);
goto next_pkt;
}
if (np->rx_csum) {
flags &= NV_RX2_CHECKSUMMASK;
if (flags == NV_RX2_CHECKSUMOK1 ||
flags == NV_RX2_CHECKSUMOK2 ||
flags == NV_RX2_CHECKSUMOK3) {
dprintk(KERN_DEBUG "%s: hw checksum hit!.\n", dev->name);
}
if ((flags & NV_RX2_CHECKSUMMASK) == NV_RX2_CHECKSUMOK2)/*ip and tcp */ {
skb->ip_summed = CHECKSUM_UNNECESSARY;
} else {
dprintk(KERN_DEBUG "%s: hwchecksum miss!.\n", dev->name);
if ((flags & NV_RX2_CHECKSUMMASK) == NV_RX2_CHECKSUMOK1 ||
(flags & NV_RX2_CHECKSUMMASK) == NV_RX2_CHECKSUMOK3) {
skb->ip_summed = CHECKSUM_UNNECESSARY;
}
}
/* got a valid packet - forward it to the network core */
skb_put(skb, len);
skb->protocol = eth_type_trans(skb, dev);
dprintk(KERN_DEBUG "%s: nv_rx_process: %d bytes, proto %d accepted.\n",
prefetch(skb->data);
dprintk(KERN_DEBUG "%s: nv_rx_process_optimized: %d bytes, proto %d accepted.\n",
dev->name, len, skb->protocol);
if (likely(!np->vlangrp)) {
#ifdef CONFIG_FORCEDETH_NAPI
netif_receive_skb(skb);
#else
netif_rx(skb);
#endif
} else {
vlanflags = le32_to_cpu(np->get_rx.ex->buflow);
if (vlanflags & NV_RX3_VLAN_TAG_PRESENT) {
#ifdef CONFIG_FORCEDETH_NAPI
if (np->vlangrp && (vlanflags & NV_RX3_VLAN_TAG_PRESENT))
vlan_hwaccel_receive_skb(skb, np->vlangrp,
vlanflags & NV_RX3_VLAN_TAG_MASK);
else
netif_receive_skb(skb);
#else
if (np->vlangrp && (vlanflags & NV_RX3_VLAN_TAG_PRESENT))
vlan_hwaccel_rx(skb, np->vlangrp,
vlanflags & NV_RX3_VLAN_TAG_MASK);
else
#endif
} else {
#ifdef CONFIG_FORCEDETH_NAPI
netif_receive_skb(skb);
#else
netif_rx(skb);
#endif
}
}
dev->last_rx = jiffies;
np->stats.rx_packets++;
np->stats.rx_bytes += len;
} else {
dev_kfree_skb(skb);
}
next_pkt:
if (np->get_rx.ex++ == np->last_rx.ex)
if (unlikely(np->get_rx.ex++ == np->last_rx.ex))
np->get_rx.ex = np->first_rx.ex;
if (np->get_rx_ctx++ == np->last_rx_ctx)
if (unlikely(np->get_rx_ctx++ == np->last_rx_ctx))
np->get_rx_ctx = np->first_rx_ctx;
}
return count;
return rx_processed_cnt;
}
static void set_bufsize(struct net_device *dev)
......
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