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cns3xxx: implement ethernet fraglist tx support for improved bridging performance with jumbo frames

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SVN-Revision: 33503
This commit is contained in:
Felix Fietkau 2012-09-22 00:34:49 +00:00
parent ed3597d927
commit fb71465a4e
1 changed files with 191 additions and 18 deletions
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209
target/linux/cns3xxx/patches-3.3/410-ethernet_fix_jumbo_frame.patch
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@ -120,12 +120,12 @@
+ /* process received frame */
+ dma_unmap_single(NULL, rx_ring->phys_tab[i],
+ RX_SEGMENT_MRU, DMA_FROM_DEVICE);
- dev = switch_port_tab[desc->sp]->netdev;
+
+ skb = build_skb(rx_ring->buff_tab[i]);
+ if (!skb)
+ break;
+
- dev = switch_port_tab[desc->sp]->netdev;
+ skb->dev = switch_port_tab[desc->sp]->netdev;
length = desc->sdl;
@ -158,12 +158,12 @@
+ sw->frag_first->truesize += skb->truesize;
+ }
+ sw->frag_last = skb;
+
+ if (desc->lsd) {
+ struct net_device *dev;
- dev->stats.rx_packets++;
- dev->stats.rx_bytes += length;
+ if (desc->lsd) {
+ struct net_device *dev;
+
+ skb = sw->frag_first;
+ dev = skb->dev;
+ skb->protocol = eth_type_trans(skb, dev);
@ -217,7 +217,51 @@
if (++i == RX_DESCS) {
i = 0;
desc = &(rx_ring)->desc[i];
@@ -671,12 +709,6 @@ static int eth_xmit(struct sk_buff *skb,
@@ -653,42 +691,60 @@ static int eth_poll(struct napi_struct *
return received;
}
+static void eth_set_desc(struct _tx_ring *tx_ring, int index, int index_last,
+ void *data, int len, u32 config0, u32 pmap)
+{
+ struct tx_desc *tx_desc = &(tx_ring)->desc[index];
+ unsigned int phys;
+
+ phys = dma_map_single(NULL, data, len, DMA_TO_DEVICE);
+ tx_desc->sdp = phys;
+ tx_desc->pmap = pmap;
+ tx_ring->phys_tab[index] = phys;
+
+ config0 |= len;
+ if (index == TX_DESCS - 1)
+ config0 |= END_OF_RING;
+ if (index == index_last)
+ config0 |= LAST_SEGMENT;
+
+ mb();
+ tx_desc->config0 = config0;
+}
+
static int eth_xmit(struct sk_buff *skb, struct net_device *dev)
{
struct port *port = netdev_priv(dev);
struct sw *sw = port->sw;
struct _tx_ring *tx_ring = sw->tx_ring;
- struct tx_desc *tx_desc;
- int index;
- int len;
+ struct sk_buff *skb1;
char pmap = (1 << port->id);
- unsigned int phys;
int nr_frags = skb_shinfo(skb)->nr_frags;
- struct skb_frag_struct *frag;
+ int nr_desc = nr_frags;
+ int index0, index, index_last;
+ int len0;
unsigned int i;
- u32 config0 = 0;
+ u32 config0;
if (pmap == 8)
pmap = (1 << 4);
@ -226,21 +270,132 @@
- dev->stats.tx_errors++;
- return NETDEV_TX_OK;
- }
-
+ skb_walk_frags(skb, skb1)
+ nr_desc++;
spin_lock(&tx_lock);
if ((tx_ring->num_used + nr_frags) >= TX_DESCS) {
@@ -701,8 +733,7 @@ static int eth_xmit(struct sk_buff *skb,
- if ((tx_ring->num_used + nr_frags) >= TX_DESCS) {
+ if ((tx_ring->num_used + nr_desc + 1) >= TX_DESCS) {
clear_tx_desc(sw);
- if ((tx_ring->num_used + nr_frags) >= TX_DESCS) {
+ if ((tx_ring->num_used + nr_desc + 1) >= TX_DESCS) {
spin_unlock(&tx_lock);
return NETDEV_TX_BUSY;
}
}
len = skb->len;
- index = tx_ring->cur_index;
- tx_ring->cur_index = ((tx_ring->cur_index + nr_frags + 1) % TX_DESCS);
+ index = index0 = tx_ring->cur_index;
+ index_last = (index0 + nr_desc) % TX_DESCS;
+ tx_ring->cur_index = (index_last + 1) % TX_DESCS;
spin_unlock(&tx_lock);
@@ -696,79 +752,41 @@ static int eth_xmit(struct sk_buff *skb,
if (skb->ip_summed == CHECKSUM_PARTIAL)
config0 |= UDP_CHECKSUM | TCP_CHECKSUM;
- if (!nr_frags) {
- tx_desc = &(tx_ring)->desc[index];
-
- len = skb->len;
+ len0 = skb->len;
- phys = dma_map_single(NULL, skb->data, len,
- DMA_TO_DEVICE);
+ phys = dma_map_single(NULL, skb->data, len, DMA_TO_DEVICE);
+ /* fragments */
+ for (i = 0; i < nr_frags; i++) {
+ struct skb_frag_struct *frag;
+ void *addr;
tx_desc->sdp = phys;
tx_desc->pmap = pmap;
@@ -849,24 +880,24 @@ static int init_rings(struct sw *sw)
- tx_desc->sdp = phys;
- tx_desc->pmap = pmap;
- tx_ring->phys_tab[index] = phys;
+ index = (index + 1) % TX_DESCS;
- tx_ring->buff_tab[index] = skb;
- config0 |= FIRST_SEGMENT | LAST_SEGMENT;
- } else {
- index = ((index + nr_frags) % TX_DESCS);
- tx_desc = &(tx_ring)->desc[index];
+ frag = &skb_shinfo(skb)->frags[i];
+ addr = page_address(skb_frag_page(frag)) + frag->page_offset;
- /* fragments */
- for (i = nr_frags; i > 0; i--) {
- u32 config;
- void *addr;
-
- frag = &skb_shinfo(skb)->frags[i-1];
- len = frag->size;
-
- addr = page_address(skb_frag_page(frag)) +
- frag->page_offset;
- phys = dma_map_single(NULL, addr, len, DMA_TO_DEVICE);
-
- tx_desc->sdp = phys;
-
- tx_desc->pmap = pmap;
- tx_ring->phys_tab[index] = phys;
-
- config = config0 | len;
- if (i == nr_frags) {
- config |= LAST_SEGMENT;
- tx_ring->buff_tab[index] = skb;
- }
- if (index == TX_DESCS - 1)
- config |= END_OF_RING;
- tx_desc->config0 = config;
-
- if (index == 0) {
- index = TX_DESCS - 1;
- tx_desc = &(tx_ring)->desc[index];
- } else {
- index--;
- tx_desc--;
- }
- }
+ eth_set_desc(tx_ring, index, index_last, addr, frag->size,
+ config0, pmap);
+ }
- /* header */
- len = skb->len - skb->data_len;
+ if (nr_frags)
+ len0 = skb->len - skb->data_len;
- phys = dma_map_single(NULL, skb->data, len, DMA_TO_DEVICE);
+ skb_walk_frags(skb, skb1) {
+ index = (index + 1) % TX_DESCS;
+ len0 -= skb1->len;
- tx_desc->sdp = phys;
- tx_desc->pmap = pmap;
- tx_ring->phys_tab[index] = phys;
- config0 |= FIRST_SEGMENT;
+ eth_set_desc(tx_ring, index, index_last, skb1->data, skb1->len,
+ config0, pmap);
}
- if (index == TX_DESCS - 1)
- config0 |= END_OF_RING;
-
- tx_desc->config0 = config0 | len;
+ tx_ring->buff_tab[index0] = skb;
+ eth_set_desc(tx_ring, index0, index_last, skb->data, len0,
+ config0 | FIRST_SEGMENT, pmap);
mb();
spin_lock(&tx_lock);
- tx_ring->num_used += nr_frags + 1;
+ tx_ring->num_used += nr_desc + 1;
spin_unlock(&tx_lock);
dev->stats.tx_packets++;
@@ -849,24 +867,24 @@ static int init_rings(struct sw *sw)
/* Setup RX buffers */
for (i = 0; i < RX_DESCS; i++) {
struct rx_desc *desc = &(rx_ring)->desc[i];
@ -276,7 +431,7 @@
rx_ring->phys_tab[i] = desc->sdp;
desc->cown = 0;
}
@@ -905,12 +936,13 @@ static void destroy_rings(struct sw *sw)
@@ -905,12 +923,13 @@ static void destroy_rings(struct sw *sw)
struct _rx_ring *rx_ring = sw->rx_ring;
struct rx_desc *desc = &(rx_ring)->desc[i];
struct sk_buff *skb = sw->rx_ring->buff_tab[i];
@ -296,7 +451,7 @@
}
dma_pool_free(rx_dma_pool, sw->rx_ring->desc, sw->rx_ring->phys_addr);
dma_pool_destroy(rx_dma_pool);
@@ -1085,13 +1117,22 @@ static int eth_set_mac(struct net_device
@@ -1085,13 +1104,22 @@ static int eth_set_mac(struct net_device
return 0;
}
@ -320,7 +475,16 @@
.ndo_set_mac_address = eth_set_mac,
.ndo_validate_addr = eth_validate_addr,
};
@@ -1124,6 +1165,10 @@ static int __devinit eth_init_one(struct
@@ -1111,7 +1139,7 @@ static int __devinit eth_init_one(struct
if (!(napi_dev = alloc_etherdev(sizeof(struct sw))))
return -ENOMEM;
strcpy(napi_dev->name, "switch%d");
- napi_dev->features = NETIF_F_IP_CSUM | NETIF_F_SG;
+ napi_dev->features = NETIF_F_IP_CSUM | NETIF_F_SG | NETIF_F_FRAGLIST;
SET_NETDEV_DEV(napi_dev, &pdev->dev);
sw = netdev_priv(napi_dev);
@@ -1124,6 +1152,10 @@ static int __devinit eth_init_one(struct
goto err_free;
}
@ -331,3 +495,12 @@
for (i = 0; i < 4; i++) {
temp = __raw_readl(&sw->regs->mac_cfg[i]);
temp |= (PORT_DISABLE);
@@ -1185,7 +1217,7 @@ static int __devinit eth_init_one(struct
dev->netdev_ops = &cns3xxx_netdev_ops;
dev->ethtool_ops = &cns3xxx_ethtool_ops;
dev->tx_queue_len = 1000;
- dev->features = NETIF_F_IP_CSUM | NETIF_F_SG;
+ dev->features = NETIF_F_IP_CSUM | NETIF_F_SG | NETIF_F_FRAGLIST;
switch_port_tab[port->id] = port;
memcpy(dev->dev_addr, &plat->hwaddr[i], ETH_ALEN);