*
* Inspiration for this driver came from the original ADMtek 2.4
* driver, Copyright ADMtek Inc.
+ *
+ * NAPI extensions by Thomas Langer (Thomas.Langer@infineon.com)
+ * and Friedrich Beckmann (Friedrich.Beckmann@infineon.com), 2007
+ *
+ * TODO: Add support of high prio queues (currently disabled)
+ *
*/
#include <linux/autoconf.h>
#include <linux/module.h>
static int adm5120_nrdevs;
static struct net_device *adm5120_devs[SW_DEVS];
+/* Lookup table port -> device */
+static struct net_device *adm5120_port[SW_DEVS];
+
static struct adm5120_dma
adm5120_dma_txh_v[ADM5120_DMA_TXH] __attribute__((aligned(16))),
adm5120_dma_txl_v[ADM5120_DMA_TXL] __attribute__((aligned(16))),
*adm5120_skb_rxl[ADM5120_DMA_RXL],
*adm5120_skb_txh[ADM5120_DMA_TXH],
*adm5120_skb_txl[ADM5120_DMA_TXL];
-static int adm5120_rxhi = 0;
static int adm5120_rxli = 0;
-/* We don't use high priority tx for now */
-/*static int adm5120_txhi = 0;*/
static int adm5120_txli = 0;
-static int adm5120_txhit = 0;
-static int adm5120_txlit = 0;
+/*static int adm5120_txhi = 0;*/
static int adm5120_if_open = 0;
static inline void adm5120_set_reg(unsigned int reg, unsigned long val)
return *(volatile unsigned long*)(SW_BASE+reg);
}
-static inline void adm5120_rxfixup(struct adm5120_dma *dma,
- struct sk_buff **skbl, int num)
+static inline void adm5120_rx_dma_update(struct adm5120_dma *dma,
+ struct sk_buff *skb, int end)
{
- int i;
-
- /* Resubmit the entire ring */
- for (i=0; i<num; i++) {
- dma[i].status = 0;
- dma[i].cntl = 0;
- dma[i].len = ADM5120_DMA_RXSIZE;
- dma[i].data = ADM5120_DMA_ADDR(skbl[i]->data) |
- ADM5120_DMA_OWN | (i==num-1 ? ADM5120_DMA_RINGEND : 0);
- }
+ dma->status = 0;
+ dma->cntl = 0;
+ dma->len = ADM5120_DMA_RXSIZE;
+ dma->data = ADM5120_DMA_ADDR(skb->data) |
+ ADM5120_DMA_OWN | (end ? ADM5120_DMA_RINGEND : 0);
}
-static inline void adm5120_rx(struct adm5120_dma *dma, struct sk_buff **skbl,
- int *index, int num)
+static int adm5120_rx(struct net_device *dev,int *budget)
{
struct sk_buff *skb, *skbn;
struct adm5120_sw *priv;
- struct net_device *dev;
- int port, vlan, len;
-
- while (!(dma[*index].data & ADM5120_DMA_OWN)) {
- port = (dma[*index].status & ADM5120_DMA_PORTID);
+ struct net_device *cdev;
+ struct adm5120_dma *dma;
+ int port, len, quota;
+
+ quota = min(dev->quota, *budget);
+ dma = &adm5120_dma_rxl[adm5120_rxli];
+ while (!(dma->data & ADM5120_DMA_OWN) && quota) {
+ port = (dma->status & ADM5120_DMA_PORTID);
port >>= ADM5120_DMA_PORTSHIFT;
- for (vlan = 0; vlan < adm5120_nrdevs; vlan++) {
- if ((1<<port) & vlan_matrix[vlan])
- break;
+ cdev = adm5120_port[port];
+ if (cdev != dev) { /* The current packet belongs to a different device */
+ if ((cdev==NULL) || !netif_running(cdev)) {
+ /* discard (update with old skb) */
+ skb = skbn = NULL;
+ goto rx_skip;
+ }
+ else {
+ netif_rx_schedule(cdev);/* Start polling next device */
+ return 1; /* return 1 -> More packets to process */
+ }
+
}
- if (vlan == adm5120_nrdevs)
- vlan = 0;
- dev = adm5120_devs[vlan];
- skb = skbl[*index];
- len = (dma[*index].status & ADM5120_DMA_LEN);
+ skb = adm5120_skb_rxl[adm5120_rxli];
+ len = (dma->status & ADM5120_DMA_LEN);
len >>= ADM5120_DMA_LENSHIFT;
len -= ETH_FCS;
priv = netdev_priv(dev);
if (len <= 0 || len > ADM5120_DMA_RXSIZE ||
- dma[*index].status & ADM5120_DMA_FCSERR) {
+ dma->status & ADM5120_DMA_FCSERR) {
priv->stats.rx_errors++;
skbn = NULL;
} else {
skb->ip_summed = CHECKSUM_UNNECESSARY;
dev->last_rx = jiffies;
priv->stats.rx_packets++;
- priv->stats.rx_bytes+=len;
- skb_reserve(skbn, 2);
- skbl[*index] = skbn;
+ priv->stats.rx_bytes += len;
+ skb_reserve(skbn, NET_IP_ALIGN);
+ adm5120_skb_rxl[adm5120_rxli] = skbn;
} else {
printk(KERN_INFO "%s recycling!\n", dev->name);
}
}
+rx_skip:
+ adm5120_rx_dma_update(&adm5120_dma_rxl[adm5120_rxli],
+ adm5120_skb_rxl[adm5120_rxli],
+ (ADM5120_DMA_RXL-1==adm5120_rxli));
+ if (ADM5120_DMA_RXL == ++adm5120_rxli)
+ adm5120_rxli = 0;
+ dma = &adm5120_dma_rxl[adm5120_rxli];
+ if (skbn){
+ netif_receive_skb(skb);
+ dev->quota--;
+ (*budget)--;
+ quota--;
+ }
+ } /* while */
+ /* If there are still packets to process, return 1 */
+ if (quota){
+ /* No more packets to process, so disable the polling and reenable the interrupts */
+ netif_rx_complete(dev);
+ adm5120_set_reg(ADM5120_INT_MASK,
+ adm5120_get_reg(ADM5120_INT_MASK) &
+ ~(ADM5120_INT_RXL|ADM5120_INT_LFULL));
+ return 0;
- dma[*index].status = 0;
- dma[*index].cntl = 0;
- dma[*index].len = ADM5120_DMA_RXSIZE;
- dma[*index].data = ADM5120_DMA_ADDR(skbl[*index]->data) |
- ADM5120_DMA_OWN |
- (num-1==*index ? ADM5120_DMA_RINGEND : 0);
- if (num == ++*index)
- *index = 0;
- if (skbn)
- netif_rx(skb);
- }
-}
-static inline void adm5120_tx(struct adm5120_dma *dma, struct sk_buff **skbl,
- int *index, int num)
-{
- while((dma[*index].data & ADM5120_DMA_OWN) == 0 && skbl[*index]) {
- dev_kfree_skb_irq(skbl[*index]);
- skbl[*index] = NULL;
- if (++*index == num)
- *index = 0;
}
+ return 1;
}
static irqreturn_t adm5120_sw_irq(int irq, void *dev_id)
{
- unsigned long intreg;
-
- adm5120_set_reg(ADM5120_INT_MASK,
- adm5120_get_reg(ADM5120_INT_MASK) | ADM5120_INTHANDLE);
-
- intreg = adm5120_get_reg(ADM5120_INT_ST);
- adm5120_set_reg(ADM5120_INT_ST, intreg);
-
- if (intreg & ADM5120_INT_RXH)
- adm5120_rx(adm5120_dma_rxh, adm5120_skb_rxh, &adm5120_rxhi,
- ADM5120_DMA_RXH);
- if (intreg & ADM5120_INT_HFULL)
- adm5120_rxfixup(adm5120_dma_rxh, adm5120_skb_rxh,
- ADM5120_DMA_RXH);
- if (intreg & ADM5120_INT_RXL)
- adm5120_rx(adm5120_dma_rxl, adm5120_skb_rxl, &adm5120_rxli,
- ADM5120_DMA_RXL);
- if (intreg & ADM5120_INT_LFULL)
- adm5120_rxfixup(adm5120_dma_rxl, adm5120_skb_rxl,
- ADM5120_DMA_RXL);
- if (intreg & ADM5120_INT_TXH)
- adm5120_tx(adm5120_dma_txh, adm5120_skb_txh, &adm5120_txhit,
- ADM5120_DMA_TXH);
- if (intreg & ADM5120_INT_TXL)
- adm5120_tx(adm5120_dma_txl, adm5120_skb_txl, &adm5120_txlit,
- ADM5120_DMA_TXL);
-
- adm5120_set_reg(ADM5120_INT_MASK,
- adm5120_get_reg(ADM5120_INT_MASK) & ~ADM5120_INTHANDLE);
+ unsigned long intreg, intmask;
+ int port;
+ struct net_device *dev;
+
+ intmask = adm5120_get_reg(ADM5120_INT_MASK); /* Remember interrupt mask */
+ adm5120_set_reg(ADM5120_INT_MASK, ADM5120_INTMASKALL); /* Disable interrupts */
+
+ intreg = adm5120_get_reg(ADM5120_INT_ST); /* Read interrupt status */
+ adm5120_set_reg(ADM5120_INT_ST, intreg); /* Clear interrupt status */
+
+ /* In NAPI operation the interrupts are disabled and the polling mechanism
+ * is activated. The interrupts are finally enabled again in the polling routine.
+ */
+ if (intreg & (ADM5120_INT_RXL|ADM5120_INT_LFULL)) {
+ /* check rx buffer for port number */
+ port = adm5120_dma_rxl[adm5120_rxli].status & ADM5120_DMA_PORTID;
+ port >>= ADM5120_DMA_PORTSHIFT;
+ dev = adm5120_port[port];
+ if ((dev==NULL) || !netif_running(dev)) {
+ /* discard (update with old skb) */
+ adm5120_rx_dma_update(&adm5120_dma_rxl[adm5120_rxli],
+ adm5120_skb_rxl[adm5120_rxli],
+ (ADM5120_DMA_RXL-1==adm5120_rxli));
+ if (ADM5120_DMA_RXL == ++adm5120_rxli)
+ adm5120_rxli = 0;
+ }
+ else {
+ netif_rx_schedule(dev);
+ intmask |= (ADM5120_INT_RXL|ADM5120_INT_LFULL); /* Disable RX interrupts */
+ }
+ }
+#ifdef CONFIG_DEBUG
+ if (intreg & ~(intmask))
+ printk(KERN_INFO "adm5120sw: IRQ 0x%08X unexpected!\n", (unsigned int)(intreg & ~(intmask)));
+#endif
+
+ adm5120_set_reg(ADM5120_INT_MASK, intmask);
return IRQ_HANDLED;
}
static void adm5120_set_vlan(char *matrix)
{
unsigned long val;
+ int vlan_port, port;
val = matrix[0] + (matrix[1]<<8) + (matrix[2]<<16) + (matrix[3]<<24);
adm5120_set_reg(ADM5120_VLAN_GI, val);
val = matrix[4] + (matrix[5]<<8);
adm5120_set_reg(ADM5120_VLAN_GII, val);
+ /* Now set/update the port vs. device lookup table */
+ for (port=0; port<SW_DEVS; port++) {
+ for (vlan_port=0; vlan_port<SW_DEVS && !(matrix[vlan_port] & (0x00000001 << port)); vlan_port++);
+ if (vlan_port <SW_DEVS)
+ adm5120_port[port] = adm5120_devs[vlan_port];
+ else
+ adm5120_port[port] = NULL;
+ }
}
static void adm5120_set_bw(char *matrix)
else
adm5120_set_reg(ADM5120_BW_CTL1, val & ~0x8000000);
- printk(KERN_DEBUG "D: ctl0 0x%x, ctl1 0x%x\n",
+ printk(KERN_DEBUG "D: ctl0 0x%lx, ctl1 0x%lx\n",
adm5120_get_reg(ADM5120_BW_CTL0),
adm5120_get_reg(ADM5120_BW_CTL1));
}
static int adm5120_sw_open(struct net_device *dev)
{
- if (!adm5120_if_open++)
- adm5120_set_reg(ADM5120_INT_MASK,
- adm5120_get_reg(ADM5120_INT_MASK) & ~ADM5120_INTHANDLE);
+ unsigned long val;
+ int i;
+
netif_start_queue(dev);
+ if (!adm5120_if_open++) {
+ /* enable interrupts on first open */
+ adm5120_set_reg(ADM5120_INT_MASK,
+ adm5120_get_reg(ADM5120_INT_MASK) &
+ ~(ADM5120_INT_RXL|ADM5120_INT_LFULL));
+ }
+ /* enable (additional) port */
+ val = adm5120_get_reg(ADM5120_PORT_CONF0);
+ for (i=0; i<SW_DEVS; i++) {
+ if (dev == adm5120_devs[i])
+ val &= ~vlan_matrix[i];
+ }
+ adm5120_set_reg(ADM5120_PORT_CONF0, val);
return 0;
}
static int adm5120_sw_stop(struct net_device *dev)
{
+ unsigned long val;
+ int i;
+
+ if (!--adm5120_if_open) {
+ adm5120_set_reg(ADM5120_INT_MASK, ADM5120_INTMASKALL);
+ }
+ /* disable port if not assigned to other devices */
+ val = adm5120_get_reg(ADM5120_PORT_CONF0) | ADM5120_PORTDISALL;
+ for (i=0; i<SW_DEVS; i++) {
+ if ((dev != adm5120_devs[i]) && netif_running(adm5120_devs[i]))
+ val &= ~vlan_matrix[i];
+ }
+ adm5120_set_reg(ADM5120_PORT_CONF0, val);
netif_stop_queue(dev);
- if (!--adm5120_if_open)
- adm5120_set_reg(ADM5120_INT_MASK,
- adm5120_get_reg(ADM5120_INT_MASK) | ADM5120_INTMASKALL);
return 0;
}
static int adm5120_sw_tx(struct sk_buff *skb, struct net_device *dev)
{
- struct adm5120_dma *dma = adm5120_dma_txl;
+ struct adm5120_dma *dma;
struct sk_buff **skbl = adm5120_skb_txl;
struct adm5120_sw *priv = netdev_priv(dev);
- int *index = &adm5120_txli;
- int num = ADM5120_DMA_TXL;
- int trigger = ADM5120_SEND_TRIG_L;
+ unsigned long data;
dev->trans_start = jiffies;
- if (dma[*index].data & ADM5120_DMA_OWN) {
+ dma = &adm5120_dma_txl[adm5120_txli];
+ if (dma->data & ADM5120_DMA_OWN) {
+ /* We want to write a packet but the TX queue is still
+ * occupied by the DMA. We are faster than the DMA... */
dev_kfree_skb(skb);
priv->stats.tx_dropped++;
return 0;
}
-
- dma[*index].data = ADM5120_DMA_ADDR(skb->data) | ADM5120_DMA_OWN;
- if (*index == num-1)
- dma[*index].data |= ADM5120_DMA_RINGEND;
- dma[*index].status =
+ data = ADM5120_DMA_ADDR(skb->data) | ADM5120_DMA_OWN;
+ if (adm5120_txli == ADM5120_DMA_TXL-1)
+ data |= ADM5120_DMA_RINGEND;
+ dma->status =
((skb->len<ETH_ZLEN?ETH_ZLEN:skb->len) << ADM5120_DMA_LENSHIFT) |
(0x1 << priv->port);
- dma[*index].len = skb->len < ETH_ZLEN ? ETH_ZLEN : skb->len;
+
+ dma->len = skb->len < ETH_ZLEN ? ETH_ZLEN : skb->len;
priv->stats.tx_packets++;
priv->stats.tx_bytes += skb->len;
- skbl[*index]=skb;
- if (++*index == num)
- *index = 0;
- adm5120_set_reg(ADM5120_SEND_TRIG, trigger);
+ /* free old skbs here instead of tx completion interrupt:
+ * will hold some more memory allocated but reduces interrupts */
+ if (skbl[adm5120_txli]){
+ dev_kfree_skb(skbl[adm5120_txli]);
+ }
+ skbl[adm5120_txli] = skb;
+ dma->data = data; /* Here we enable the buffer for the TX DMA machine */
+ adm5120_set_reg(ADM5120_SEND_TRIG, ADM5120_SEND_TRIG_L);
+ if (++adm5120_txli == ADM5120_DMA_TXL)
+ adm5120_txli = 0;
return 0;
}
static void adm5120_tx_timeout(struct net_device *dev)
{
- netif_wake_queue(dev);
+ printk(KERN_INFO "%s: TX timeout\n",dev->name);
}
static struct net_device_stats *adm5120_sw_stats(struct net_device *dev)
{
+ struct adm5120_sw *priv = netdev_priv(dev);
+ int portmask;
+ unsigned long adm5120_cpup_conf_reg;
+
+ portmask = vlan_matrix[priv->port] & 0x3f;
+
+ adm5120_cpup_conf_reg = adm5120_get_reg(ADM5120_CPUP_CONF);
+
+ if (dev->flags & IFF_PROMISC)
+ adm5120_cpup_conf_reg &= ~((portmask << ADM5120_DISUNSHIFT) & ADM5120_DISUNALL);
+ else
+ adm5120_cpup_conf_reg |= (portmask << ADM5120_DISUNSHIFT);
+
+ if (dev->flags & IFF_PROMISC || dev->flags & IFF_ALLMULTI || dev->mc_count)
+ adm5120_cpup_conf_reg &= ~((portmask << ADM5120_DISMCSHIFT) & ADM5120_DISMCALL);
+ else
+ adm5120_cpup_conf_reg |= (portmask << ADM5120_DISMCSHIFT);
+
+ /* If there is any port configured to be in promiscuous mode, then the */
+ /* Bridge Test Mode has to be activated. This will result in */
+ /* transporting also packets learned in another VLAN to be forwarded */
+ /* to the CPU. */
+ /* The difficult scenario is when we want to build a bridge on the CPU.*/
+ /* Assume we have port0 and the CPU port in VLAN0 and port1 and the */
+ /* CPU port in VLAN1. Now we build a bridge on the CPU between */
+ /* VLAN0 and VLAN1. Both ports of the VLANs are set in promisc mode. */
+ /* Now assume a packet with ethernet source address 99 enters port 0 */
+ /* It will be forwarded to the CPU because it is unknown. Then the */
+ /* bridge in the CPU will send it to VLAN1 and it goes out at port 1. */
+ /* When now a packet with ethernet destination address 99 comes in at */
+ /* port 1 in VLAN1, then the switch has learned that this address is */
+ /* located at port 0 in VLAN0. Therefore the switch will drop */
+ /* this packet. In order to avoid this and to send the packet still */
+ /* to the CPU, the Bridge Test Mode has to be activated. */
+
+ /* Check if there is any vlan in promisc mode. */
+ if (~adm5120_cpup_conf_reg & ADM5120_DISUNALL)
+ adm5120_cpup_conf_reg |= ADM5120_BTM; /* Set the BTM */
+ else
+ adm5120_cpup_conf_reg &= ~ADM5120_BTM; /* Disable the BTM */
+
+ adm5120_set_reg(ADM5120_CPUP_CONF,adm5120_cpup_conf_reg);
+
return &((struct adm5120_sw *)netdev_priv(dev))->stats;
}
return 0;
}
-static void adm5120_dma_tx_init(struct adm5120_dma *dma, struct sk_buff **skb,
+static void adm5120_dma_tx_init(struct adm5120_dma *dma, struct sk_buff **skbl,
int num)
{
memset(dma, 0, sizeof(struct adm5120_dma)*num);
dma[num-1].data |= ADM5120_DMA_RINGEND;
- memset(skb, 0, sizeof(struct skb*)*num);
+ memset(skbl, 0, sizeof(struct skb*)*num);
}
-static void adm5120_dma_rx_init(struct adm5120_dma *dma, struct sk_buff **skb,
+static void adm5120_dma_rx_init(struct adm5120_dma *dma, struct sk_buff **skbl,
int num)
{
int i;
memset(dma, 0, sizeof(struct adm5120_dma)*num);
for (i=0; i<num; i++) {
- skb[i] = dev_alloc_skb(ADM5120_DMA_RXSIZE+16);
- if (!skb[i]) {
+ skbl[i] = dev_alloc_skb(ADM5120_DMA_RXSIZE+16);
+ if (!skbl[i]) {
i=num;
break;
}
- skb_reserve(skb[i], 2);
- dma[i].data = ADM5120_DMA_ADDR(skb[i]->data) | ADM5120_DMA_OWN;
- dma[i].cntl = 0;
- dma[i].len = ADM5120_DMA_RXSIZE;
- dma[i].status = 0;
+ skb_reserve(skbl[i], NET_IP_ALIGN);
+ adm5120_rx_dma_update(&dma[i], skbl[i], (num-1==i));
}
- dma[i-1].data |= ADM5120_DMA_RINGEND;
}
static int __init adm5120_sw_init(void)
adm5120_set_reg(ADM5120_CPUP_CONF,
ADM5120_DISCCPUPORT | ADM5120_CRC_PADDING |
ADM5120_DISUNALL | ADM5120_DISMCALL);
- adm5120_set_reg(ADM5120_PORT_CONF0, ADM5120_ENMC | ADM5120_ENBP);
+ adm5120_set_reg(ADM5120_PORT_CONF0, ADM5120_ENMC | ADM5120_ENBP | ADM5120_PORTDISALL);
adm5120_set_reg(ADM5120_PHY_CNTL2, adm5120_get_reg(ADM5120_PHY_CNTL2) |
ADM5120_AUTONEG | ADM5120_NORMAL | ADM5120_AUTOMDIX);
adm5120_set_reg(ADM5120_RECEIVE_HBADDR, KSEG1ADDR(adm5120_dma_rxh));
adm5120_set_reg(ADM5120_RECEIVE_LBADDR, KSEG1ADDR(adm5120_dma_rxl));
- adm5120_set_vlan(vlan_matrix);
-
for (i=0; i<adm5120_nrdevs; i++) {
adm5120_devs[i] = alloc_etherdev(sizeof(struct adm5120_sw));
if (!adm5120_devs[i]) {
dev->tx_timeout = adm5120_tx_timeout;
dev->watchdog_timeo = ETH_TX_TIMEOUT;
dev->set_mac_address = adm5120_sw_set_mac_address;
+ dev->poll = adm5120_rx;
+ dev->weight = 64;
memcpy(dev->dev_addr, adm5120_eth_macs[i], 6);
adm5120_write_mac(dev);
}
printk(KERN_INFO "%s: ADM5120 switch port%d\n", dev->name, i);
}
+ /* setup vlan/port mapping after devs are filled up */
+ adm5120_set_vlan(vlan_matrix);
+
adm5120_set_reg(ADM5120_CPUP_CONF,
ADM5120_CRC_PADDING | ADM5120_DISUNALL | ADM5120_DISMCALL);
projects / openwrt.git / commitdiff