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cns3xxx: fix ethernet jumbo-frame support, use single-page rx buffers and skb fragment lists 

SVN-Revision: 33491
This commit is contained in:
Felix Fietkau 2012-09-19 23:50:18 +00:00
parent eff9405752
commit 34d30654ae
1 changed files with 317 additions and 0 deletions
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317
target/linux/cns3xxx/patches-3.3/410-ethernet_fix_jumbo_frame.patch Normal file
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@ -0,0 +1,317 @@
--- a/drivers/net/ethernet/cavium/cns3xxx_eth.c
+++ b/drivers/net/ethernet/cavium/cns3xxx_eth.c
@@ -26,15 +26,18 @@
#define DRV_NAME "cns3xxx_eth"
-#define RX_DESCS 512
-#define TX_DESCS 512
-#define SKB_DMA_REALIGN ((PAGE_SIZE - NET_SKB_PAD) % SMP_CACHE_BYTES)
+#define RX_DESCS 128
+#define TX_DESCS 128
#define RX_POOL_ALLOC_SIZE (sizeof(struct rx_desc) * RX_DESCS)
#define TX_POOL_ALLOC_SIZE (sizeof(struct tx_desc) * TX_DESCS)
#define REGS_SIZE 336
-#define MAX_MRU (1536 + SKB_DMA_REALIGN)
-#define CNS3XXX_MAX_MTU (1536)
+
+#define SKB_HEAD_ALIGN (((PAGE_SIZE - NET_SKB_PAD) % SMP_CACHE_BYTES) + NET_SKB_PAD + NET_IP_ALIGN)
+#define RX_SEGMENT_ALLOC_SIZE 4096
+#define RX_SEGMENT_BUFSIZE (SKB_WITH_OVERHEAD(RX_SEGMENT_ALLOC_SIZE))
+#define RX_SEGMENT_MRU ((RX_SEGMENT_BUFSIZE - SKB_HEAD_ALIGN))
+#define MAX_MTU 9500
#define NAPI_WEIGHT 64
@@ -266,7 +269,7 @@ struct _rx_ring {
struct rx_desc *desc;
dma_addr_t phys_addr;
struct rx_desc *cur_addr;
- struct sk_buff *buff_tab[RX_DESCS];
+ void *buff_tab[RX_DESCS];
unsigned int phys_tab[RX_DESCS];
u32 cur_index;
u32 alloc_index;
@@ -280,6 +283,8 @@ struct sw {
struct cns3xxx_plat_info *plat;
struct _tx_ring *tx_ring;
struct _rx_ring *rx_ring;
+ struct sk_buff *frag_first;
+ struct sk_buff *frag_last;
};
struct port {
@@ -500,37 +505,35 @@ static void cns3xxx_alloc_rx_buf(struct
struct _rx_ring *rx_ring = sw->rx_ring;
unsigned int i = rx_ring->alloc_index;
struct rx_desc *desc = &(rx_ring)->desc[i];
- struct sk_buff *skb;
+ void *buf;
unsigned int phys;
for (received += rx_ring->alloc_count; received > 0; received--) {
- if ((skb = dev_alloc_skb(MAX_MRU))) {
- if (SKB_DMA_REALIGN)
- skb_reserve(skb, SKB_DMA_REALIGN);
- skb_reserve(skb, NET_IP_ALIGN);
- phys = dma_map_single(NULL, skb->data,
- CNS3XXX_MAX_MTU, DMA_FROM_DEVICE);
- if (dma_mapping_error(NULL, phys)) {
- dev_kfree_skb(skb);
- /* Failed to map, better luck next time */
- goto out;;
- }
- desc->sdp = phys;
- } else {
- /* Failed to allocate skb, try again next time */
+ buf = kzalloc(RX_SEGMENT_ALLOC_SIZE, GFP_ATOMIC);
+ if (!buf)
+ goto out;
+
+ phys = dma_map_single(NULL, buf + SKB_HEAD_ALIGN,
+ RX_SEGMENT_MRU, DMA_FROM_DEVICE);
+ if (dma_mapping_error(NULL, phys)) {
+ kfree(buf);
goto out;
}
+ desc->sdl = RX_SEGMENT_MRU;
+ desc->sdp = phys;
+
/* put the new buffer on RX-free queue */
- rx_ring->buff_tab[i] = skb;
+ rx_ring->buff_tab[i] = buf;
rx_ring->phys_tab[i] = phys;
if (i == RX_DESCS - 1) {
i = 0;
desc->config0 = END_OF_RING | FIRST_SEGMENT |
- LAST_SEGMENT | CNS3XXX_MAX_MTU;
+ LAST_SEGMENT | RX_SEGMENT_MRU;
desc = &(rx_ring)->desc[i];
} else {
- desc->config0 = FIRST_SEGMENT | LAST_SEGMENT | CNS3XXX_MAX_MTU;
+ desc->config0 = FIRST_SEGMENT | LAST_SEGMENT |
+ RX_SEGMENT_MRU;
i++;
desc++;
}
@@ -588,49 +591,78 @@ static int eth_poll(struct napi_struct *
while (desc->cown) {
struct sk_buff *skb;
+ int reserve = SKB_HEAD_ALIGN;
if (received >= budget)
break;
- skb = rx_ring->buff_tab[i];
+ /* process received frame */
+ dma_unmap_single(&dev->dev, rx_ring->phys_tab[i],
+ RX_SEGMENT_MRU, DMA_FROM_DEVICE);
+
+ skb = build_skb(rx_ring->buff_tab[i]);
+ if (!skb)
+ break;
dev = switch_port_tab[desc->sp]->netdev;
length = desc->sdl;
- /* process received frame */
- dma_unmap_single(&dev->dev, rx_ring->phys_tab[i],
- length, DMA_FROM_DEVICE);
+ if (desc->fsd && !desc->lsd)
+ length = RX_SEGMENT_MRU;
+ if (!desc->fsd) {
+ reserve -= NET_IP_ALIGN;
+ if (!desc->lsd)
+ length += NET_IP_ALIGN;
+ }
+
+ skb_reserve(skb, reserve);
skb_put(skb, length);
- skb->dev = dev;
- skb->protocol = eth_type_trans(skb, dev);
+ if (!sw->frag_first)
+ sw->frag_first = skb;
+ else {
+ if (sw->frag_first == sw->frag_last)
+ skb_frag_add_head(sw->frag_first, skb);
+ sw->frag_last->next = skb;
+ sw->frag_first->len += skb->len;
+ sw->frag_first->data_len += skb->len;
+ sw->frag_first->truesize += skb->truesize;
+ }
+ sw->frag_last = skb;
- dev->stats.rx_packets++;
- dev->stats.rx_bytes += length;
+ if (desc->lsd) {
+ skb = sw->frag_first;
+ skb->protocol = eth_type_trans(skb, dev);
+
+ dev->stats.rx_packets++;
+ dev->stats.rx_bytes += skb->len;
+
+ /* RX Hardware checksum offload */
+ skb->ip_summed = CHECKSUM_NONE;
+ switch (desc->prot) {
+ case 1:
+ case 2:
+ case 5:
+ case 6:
+ case 13:
+ case 14:
+ if (desc->l4f)
+ break;
- /* RX Hardware checksum offload */
- switch (desc->prot) {
- case 1:
- case 2:
- case 5:
- case 6:
- case 13:
- case 14:
- if (desc->l4f)
- skb->ip_summed = CHECKSUM_NONE;
- else
skb->ip_summed = CHECKSUM_UNNECESSARY;
- break;
- default:
- skb->ip_summed = CHECKSUM_NONE;
- break;
- }
+ break;
+ default:
+ break;
+ }
- napi_gro_receive(napi, skb);
+ napi_gro_receive(napi, skb);
- received++;
+ sw->frag_first = NULL;
+ sw->frag_last = NULL;
+ }
+ received++;
if (++i == RX_DESCS) {
i = 0;
desc = &(rx_ring)->desc[i];
@@ -671,12 +703,6 @@ static int eth_xmit(struct sk_buff *skb,
if (pmap == 8)
pmap = (1 << 4);
- if (skb->len > CNS3XXX_MAX_MTU) {
- dev_kfree_skb(skb);
- dev->stats.tx_errors++;
- return NETDEV_TX_OK;
- }
-
spin_lock(&tx_lock);
if ((tx_ring->num_used + nr_frags) >= TX_DESCS) {
@@ -701,8 +727,7 @@ static int eth_xmit(struct sk_buff *skb,
len = skb->len;
- phys = dma_map_single(NULL, skb->data, len,
- DMA_TO_DEVICE);
+ phys = dma_map_single(NULL, skb->data, len, DMA_TO_DEVICE);
tx_desc->sdp = phys;
tx_desc->pmap = pmap;
@@ -849,24 +874,24 @@ 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];
- struct sk_buff *skb;
- if (!(skb = dev_alloc_skb(MAX_MRU)))
+ void *buf;
+
+ buf = kzalloc(RX_SEGMENT_ALLOC_SIZE, GFP_KERNEL);
+ if (!buf)
return -ENOMEM;
- if (SKB_DMA_REALIGN)
- skb_reserve(skb, SKB_DMA_REALIGN);
- skb_reserve(skb, NET_IP_ALIGN);
- desc->sdl = CNS3XXX_MAX_MTU;
+
+ desc->sdl = RX_SEGMENT_MRU;
if (i == (RX_DESCS - 1))
desc->eor = 1;
desc->fsd = 1;
desc->lsd = 1;
- desc->sdp = dma_map_single(NULL, skb->data,
- CNS3XXX_MAX_MTU, DMA_FROM_DEVICE);
- if (dma_mapping_error(NULL, desc->sdp)) {
+ desc->sdp = dma_map_single(NULL, buf + SKB_HEAD_ALIGN,
+ RX_SEGMENT_MRU, DMA_FROM_DEVICE);
+ if (dma_mapping_error(NULL, desc->sdp))
return -EIO;
- }
- rx_ring->buff_tab[i] = skb;
+
+ rx_ring->buff_tab[i] = buf;
rx_ring->phys_tab[i] = desc->sdp;
desc->cown = 0;
}
@@ -905,12 +930,13 @@ 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];
- if (skb) {
- dma_unmap_single(NULL,
- desc->sdp,
- CNS3XXX_MAX_MTU, DMA_FROM_DEVICE);
- dev_kfree_skb(skb);
- }
+
+ if (!skb)
+ continue;
+
+ dma_unmap_single(NULL, desc->sdp, RX_SEGMENT_MRU,
+ DMA_FROM_DEVICE);
+ dev_kfree_skb(skb);
}
dma_pool_free(rx_dma_pool, sw->rx_ring->desc, sw->rx_ring->phys_addr);
dma_pool_destroy(rx_dma_pool);
@@ -1085,13 +1111,22 @@ static int eth_set_mac(struct net_device
return 0;
}
+static int cns3xxx_change_mtu(struct net_device *dev, int new_mtu)
+{
+ if (new_mtu > MAX_MTU)
+ return -EINVAL;
+
+ dev->mtu = new_mtu;
+ return 0;
+}
+
static const struct net_device_ops cns3xxx_netdev_ops = {
.ndo_open = eth_open,
.ndo_stop = eth_close,
.ndo_start_xmit = eth_xmit,
.ndo_set_rx_mode = eth_rx_mode,
.ndo_do_ioctl = eth_ioctl,
- .ndo_change_mtu = eth_change_mtu,
+ .ndo_change_mtu = cns3xxx_change_mtu,
.ndo_set_mac_address = eth_set_mac,
.ndo_validate_addr = eth_validate_addr,
};
@@ -1124,6 +1159,10 @@ static int __devinit eth_init_one(struct
goto err_free;
}
+ temp = __raw_readl(&sw->regs->phy_auto_addr);
+ temp |= (3 << 30); /* maximum frame length: 9600 bytes */
+ __raw_writel(temp, &sw->regs->phy_auto_addr);
+
for (i = 0; i < 4; i++) {
temp = __raw_readl(&sw->regs->mac_cfg[i]);
temp |= (PORT_DISABLE);