descr->buf_addr = 0;
dev_kfree_skb_any(descr->skb);
descr->skb = NULL;
- descr->dmac_cmd_status = GELIC_NET_DESCR_NOT_IN_USE;
+ gelic_net_set_descr_status(descr,
+ GELIC_NET_DESCR_NOT_IN_USE);
}
descr = descr->next;
} while (descr != card->rx_chain.head);
descr->skb = NULL;
/* set descr status */
- descr->dmac_cmd_status = GELIC_NET_DMAC_CMDSTAT_NOT_IN_USE;
+ gelic_net_set_descr_status(descr, GELIC_NET_DESCR_NOT_IN_USE);
}
/**
"%s: forcing end of tx descriptor " \
"with status %x\n",
__func__, status);
- card->netdev_stats.tx_dropped++;
+ card->netdev->stats.tx_dropped++;
break;
case GELIC_NET_DESCR_COMPLETE:
- card->netdev_stats.tx_packets++;
- card->netdev_stats.tx_bytes +=
- tx_chain->tail->skb->len;
+ if (tx_chain->tail->skb) {
+ card->netdev->stats.tx_packets++;
+ card->netdev->stats.tx_bytes +=
+ tx_chain->tail->skb->len;
+ }
break;
case GELIC_NET_DESCR_CARDOWNED:
/* pending tx request */
default:
/* any other value (== GELIC_NET_DESCR_NOT_IN_USE) */
- goto out;
+ if (!stop)
+ goto out;
}
gelic_net_release_tx_descr(card, tx_chain->tail);
- release = 1;
+ release ++;
}
out:
- if (!stop && release)
+ if (!stop && (2 < release))
netif_wake_queue(card->netdev);
}
{
struct gelic_net_card *card = netdev_priv(netdev);
- netif_poll_disable(netdev);
netif_stop_queue(netdev);
/* turn off DMA, force end */
{
dma_addr_t buf[2];
unsigned int vlan_len;
+ struct gelic_net_descr *sec_descr = descr->next;
if (skb->len < GELIC_NET_VLAN_POS)
return -EINVAL;
- memcpy(&descr->vlan, skb->data, GELIC_NET_VLAN_POS);
+ vlan_len = GELIC_NET_VLAN_POS;
+ memcpy(&descr->vlan, skb->data, vlan_len);
if (card->vlan_index != -1) {
+ /* internal vlan tag used */
descr->vlan.h_vlan_proto = htons(ETH_P_8021Q); /* vlan 0x8100*/
descr->vlan.h_vlan_TCI = htons(card->vlan_id[card->vlan_index]);
- vlan_len = GELIC_NET_VLAN_POS + VLAN_HLEN; /* VLAN_HLEN=4 */
- } else
- vlan_len = GELIC_NET_VLAN_POS; /* no vlan tag */
+ vlan_len += VLAN_HLEN; /* added for above two lines */
+ }
- /* first descr */
+ /* map data area */
buf[0] = dma_map_single(ctodev(card), &descr->vlan,
vlan_len, DMA_TO_DEVICE);
return -ENOMEM;
}
- descr->buf_addr = buf[0];
- descr->buf_size = vlan_len;
- descr->skb = skb; /* not used */
- descr->data_status = 0;
- gelic_net_set_txdescr_cmdstat(descr, skb, 1); /* not the frame end */
-
- /* second descr */
- card->tx_chain.head = card->tx_chain.head->next;
- descr->next_descr_addr = descr->next->bus_addr;
- descr = descr->next;
- if (gelic_net_get_descr_status(descr) != GELIC_NET_DESCR_NOT_IN_USE)
- /* XXX will be removed */
- dev_err(ctodev(card), "descr is not free!\n");
-
buf[1] = dma_map_single(ctodev(card), skb->data + GELIC_NET_VLAN_POS,
skb->len - GELIC_NET_VLAN_POS,
DMA_TO_DEVICE);
return -ENOMEM;
}
- descr->buf_addr = buf[1];
- descr->buf_size = skb->len - GELIC_NET_VLAN_POS;
- descr->skb = skb;
+ /* first descr */
+ descr->buf_addr = buf[0];
+ descr->buf_size = vlan_len;
+ descr->skb = NULL; /* not used */
descr->data_status = 0;
- descr->next_descr_addr = 0; /* terminate hw descr */
- gelic_net_set_txdescr_cmdstat(descr, skb, 0);
+ descr->next_descr_addr = descr->next->bus_addr;
+ gelic_net_set_txdescr_cmdstat(descr, skb, 1); /* not the frame end */
+ /* second descr */
+ sec_descr->buf_addr = buf[1];
+ sec_descr->buf_size = skb->len - GELIC_NET_VLAN_POS;
+ sec_descr->skb = skb;
+ sec_descr->data_status = 0;
+ sec_descr->next_descr_addr = 0; /* terminate hw descr */
+ gelic_net_set_txdescr_cmdstat(sec_descr, skb, 0);
+
+ /* bump free descriptor pointer */
+ card->tx_chain.head = sec_descr->next;
return 0;
}
static int gelic_net_kick_txdma(struct gelic_net_card *card,
struct gelic_net_descr *descr)
{
- int status = -ENXIO;
+ int status = 0;
int count = 10;
if (card->tx_dma_progress)
static int gelic_net_xmit(struct sk_buff *skb, struct net_device *netdev)
{
struct gelic_net_card *card = netdev_priv(netdev);
- struct gelic_net_descr *descr = NULL;
+ struct gelic_net_descr *descr;
int result;
unsigned long flags;
spin_lock_irqsave(&card->tx_dma_lock, flags);
gelic_net_release_tx_chain(card, 0);
- if (!skb)
- goto kick;
+
descr = gelic_net_get_next_tx_descr(card);
if (!descr) {
+ /*
+ * no more descriptors free
+ */
netif_stop_queue(netdev);
spin_unlock_irqrestore(&card->tx_dma_lock, flags);
return NETDEV_TX_BUSY;
}
- result = gelic_net_prepare_tx_descr_v(card, descr, skb);
-
- if (result)
- goto error;
- card->tx_chain.head = card->tx_chain.head->next;
-
- if (descr->prev)
- descr->prev->next_descr_addr = descr->bus_addr;
-kick:
+ result = gelic_net_prepare_tx_descr_v(card, descr, skb);
+ if (result) {
+ /*
+ * DMA map failed. As chanses are that failure
+ * would continue, just release skb and return
+ */
+ card->netdev->stats.tx_dropped++;
+ dev_kfree_skb_any(skb);
+ spin_unlock_irqrestore(&card->tx_dma_lock, flags);
+ return NETDEV_TX_OK;
+ }
+ /*
+ * link this prepared descriptor to previous one
+ * to achieve high performance
+ */
+ descr->prev->next_descr_addr = descr->bus_addr;
/*
* as hardware descriptor is modified in the above lines,
* ensure that the hardware sees it
*/
wmb();
- if (gelic_net_kick_txdma(card, card->tx_chain.tail))
- goto error;
+ if (gelic_net_kick_txdma(card, descr)) {
+ /*
+ * kick failed.
+ * release descriptors which were just prepared
+ */
+ card->netdev->stats.tx_dropped++;
+ gelic_net_release_tx_descr(card, descr);
+ gelic_net_release_tx_descr(card, descr->next);
+ card->tx_chain.tail = descr->next->next;
+ dev_info(ctodev(card), "%s: kick failure\n", __func__);
+ } else {
+ /* OK, DMA started/reserved */
+ netdev->trans_start = jiffies;
+ }
- netdev->trans_start = jiffies;
spin_unlock_irqrestore(&card->tx_dma_lock, flags);
return NETDEV_TX_OK;
-
-error:
- card->netdev_stats.tx_dropped++;
- spin_unlock_irqrestore(&card->tx_dma_lock, flags);
- return NETDEV_TX_LOCKED;
}
/**
skb->ip_summed = CHECKSUM_NONE;
/* update netdevice statistics */
- card->netdev_stats.rx_packets++;
- card->netdev_stats.rx_bytes += skb->len;
+ card->netdev->stats.rx_packets++;
+ card->netdev->stats.rx_bytes += skb->len;
/* pass skb up to stack */
netif_receive_skb(skb);
(status == GELIC_NET_DESCR_FORCE_END)) {
dev_info(ctodev(card), "dropping RX descriptor with state %x\n",
status);
- card->netdev_stats.rx_dropped++;
+ card->netdev->stats.rx_dropped++;
goto refill;
}
- if ((status != GELIC_NET_DESCR_COMPLETE) &&
- (status != GELIC_NET_DESCR_FRAME_END)) {
+ if (status == GELIC_NET_DESCR_BUFFER_FULL) {
+ /*
+ * Buffer full would occur if and only if
+ * the frame length was longer than the size of this
+ * descriptor's buffer. If the frame length was equal
+ * to or shorter than buffer'size, FRAME_END condition
+ * would occur.
+ * Anyway this frame was longer than the MTU,
+ * just drop it.
+ */
+ dev_info(ctodev(card), "overlength frame\n");
+ goto refill;
+ }
+ /*
+ * descriptoers any other than FRAME_END here should
+ * be treated as error.
+ */
+ if (status != GELIC_NET_DESCR_FRAME_END) {
dev_dbg(ctodev(card), "RX descriptor with state %x\n",
status);
goto refill;
}
/* ok, we've got a packet in descr */
- gelic_net_pass_skb_up(descr, card); /* 1: skb_up sccess */
-
+ gelic_net_pass_skb_up(descr, card);
refill:
- descr->next_descr_addr = 0; /* unlink the descr */
+ /*
+ * So that always DMAC can see the end
+ * of the descriptor chain to avoid
+ * from unwanted DMAC overrun.
+ */
+ descr->next_descr_addr = 0;
/* change the descriptor state: */
gelic_net_set_descr_status(descr, GELIC_NET_DESCR_NOT_IN_USE);
- /* refill one desc
- * FIXME: this can fail, but for now, just leave this
- * descriptor without skb
+ /*
+ * this call can fail, but for now, just leave this
+ * decriptor without skb
*/
gelic_net_prepare_rx_descr(card, descr);
+
chain->head = descr;
chain->tail = descr->next;
+
+ /*
+ * Set this descriptor the end of the chain.
+ */
descr->prev->next_descr_addr = descr->bus_addr;
+ /*
+ * If dmac chain was met, DMAC stopped.
+ * thus re-enable it
+ */
if (dmac_chain_ended) {
- gelic_net_enable_rxdmac(card);
- dev_dbg(ctodev(card), "reenable rx dma\n");
+ card->rx_dma_restart_required = 1;
+ dev_dbg(ctodev(card), "reenable rx dma scheduled\n");
}
return 1;
} else
return 1;
}
-
-/**
- * gelic_net_get_stats - get interface statistics
- * @netdev: interface device structure
- *
- * returns the interface statistics residing in the gelic_net_card struct
- */
-static struct net_device_stats *gelic_net_get_stats(struct net_device *netdev)
-{
- struct gelic_net_card *card = netdev_priv(netdev);
-
- return &card->netdev_stats;
-}
-
/**
* gelic_net_change_mtu - changes the MTU of an interface
* @netdev: interface device structure
if (!status)
return IRQ_NONE;
+ if (card->rx_dma_restart_required) {
+ card->rx_dma_restart_required = 0;
+ gelic_net_enable_rxdmac(card);
+ }
+
if (status & GELIC_NET_RXINT) {
gelic_net_rx_irq_off(card);
netif_rx_schedule(netdev);
if (status & GELIC_NET_TXINT) {
spin_lock_irqsave(&card->tx_dma_lock, flags);
card->tx_dma_progress = 0;
+ gelic_net_release_tx_chain(card, 0);
+ /* kick outstanding tx descriptor if any */
+ gelic_net_kick_txdma(card, card->tx_chain.tail);
spin_unlock_irqrestore(&card->tx_dma_lock, flags);
- /* start pending DMA */
- gelic_net_xmit(NULL, netdev);
}
return IRQ_HANDLED;
}
}
result = request_irq(card->netdev->irq, gelic_net_interrupt,
- IRQF_DISABLED, "gelic network", card->netdev);
+ IRQF_DISABLED, card->netdev->name, card->netdev);
if (result) {
dev_info(ctodev(card), "%s:%d: request_irq failed (%d)\n",
card->descr, GELIC_NET_TX_DESCRIPTORS))
goto alloc_tx_failed;
if (gelic_net_init_chain(card, &card->rx_chain,
- card->descr + GELIC_NET_RX_DESCRIPTORS,
+ card->descr + GELIC_NET_TX_DESCRIPTORS,
GELIC_NET_RX_DESCRIPTORS))
goto alloc_rx_failed;
netif_start_queue(netdev);
netif_carrier_on(netdev);
- netif_poll_enable(netdev);
return 0;
return -ENOMEM;
}
-#ifdef GELIC_NET_ETHTOOL
static void gelic_net_get_drvinfo (struct net_device *netdev,
struct ethtool_drvinfo *info)
{
.get_rx_csum = gelic_net_get_rx_csum,
.set_rx_csum = gelic_net_set_rx_csum,
};
-#endif
/**
* gelic_net_tx_timeout_task - task scheduled by the watchdog timeout
netdev->open = &gelic_net_open;
netdev->stop = &gelic_net_stop;
netdev->hard_start_xmit = &gelic_net_xmit;
- netdev->get_stats = &gelic_net_get_stats;
netdev->set_multicast_list = &gelic_net_set_multi;
netdev->change_mtu = &gelic_net_change_mtu;
/* tx watchdog */
/* NAPI */
netdev->poll = &gelic_net_poll;
netdev->weight = GELIC_NET_NAPI_WEIGHT;
-#ifdef GELIC_NET_ETHTOOL
netdev->ethtool_ops = &gelic_net_ethtool_ops;
-#endif
}
/**
projects / linux-2.6-omap-h63xx.git / blobdiff