gianfar: comment cleanup
Signed-off-by: Jan Ceuleers <jan.ceuleers@computer.org> Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jan Ceuleers
David S. Miller
Родитель
2281a0f334
Коммит
0977f817df
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@ -1,5 +1,4 @@
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/*
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* drivers/net/ethernet/freescale/gianfar.c
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/* drivers/net/ethernet/freescale/gianfar.c
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*
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* Gianfar Ethernet Driver
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* This driver is designed for the non-CPM ethernet controllers
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@ -405,7 +404,8 @@ static void gfar_init_mac(struct net_device *ndev)
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gfar_write(®s->attreli, attrs);
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/* Start with defaults, and add stashing or locking
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* depending on the approprate variables */
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* depending on the approprate variables
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*/
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attrs = ATTR_INIT_SETTINGS;
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if (priv->bd_stash_en)
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@ -652,7 +652,7 @@ static int gfar_of_init(struct platform_device *ofdev, struct net_device **pdev)
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priv->num_rx_queues = num_rx_qs;
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priv->num_grps = 0x0;
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/* Init Rx queue filer rule set linked list*/
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/* Init Rx queue filer rule set linked list */
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INIT_LIST_HEAD(&priv->rx_list.list);
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priv->rx_list.count = 0;
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mutex_init(&priv->rx_queue_access);
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@ -960,7 +960,8 @@ static void gfar_detect_errata(struct gfar_private *priv)
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}
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/* Set up the ethernet device structure, private data,
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* and anything else we need before we start */
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* and anything else we need before we start
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*/
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static int gfar_probe(struct platform_device *ofdev)
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{
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u32 tempval;
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@ -991,8 +992,9 @@ static int gfar_probe(struct platform_device *ofdev)
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gfar_detect_errata(priv);
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/* Stop the DMA engine now, in case it was running before */
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/* (The firmware could have used it, and left it running). */
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/* Stop the DMA engine now, in case it was running before
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* (The firmware could have used it, and left it running).
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*/
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gfar_halt(dev);
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/* Reset MAC layer */
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@ -1098,7 +1100,8 @@ static int gfar_probe(struct platform_device *ofdev)
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/* Need to reverse the bit maps as bit_map's MSB is q0
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* but, for_each_set_bit parses from right to left, which
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* basically reverses the queue numbers */
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* basically reverses the queue numbers
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*/
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for (i = 0; i< priv->num_grps; i++) {
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priv->gfargrp[i].tx_bit_map = reverse_bitmap(
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priv->gfargrp[i].tx_bit_map, MAX_TX_QS);
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@ -1107,7 +1110,8 @@ static int gfar_probe(struct platform_device *ofdev)
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}
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/* Calculate RSTAT, TSTAT, RQUEUE and TQUEUE values,
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* also assign queues to groups */
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* also assign queues to groups
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*/
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for (grp_idx = 0; grp_idx < priv->num_grps; grp_idx++) {
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priv->gfargrp[grp_idx].num_rx_queues = 0x0;
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for_each_set_bit(i, &priv->gfargrp[grp_idx].rx_bit_map,
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@ -1149,7 +1153,7 @@ static int gfar_probe(struct platform_device *ofdev)
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priv->rx_queue[i]->rxic = DEFAULT_RXIC;
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}
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/* always enable rx filer*/
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/* always enable rx filer */
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priv->rx_filer_enable = 1;
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/* Enable most messages by default */
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priv->msg_enable = (NETIF_MSG_IFUP << 1 ) - 1;
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@ -1189,8 +1193,9 @@ static int gfar_probe(struct platform_device *ofdev)
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/* Print out the device info */
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netdev_info(dev, "mac: %pM\n", dev->dev_addr);
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/* Even more device info helps when determining which kernel */
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/* provided which set of benchmarks. */
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/* Even more device info helps when determining which kernel
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* provided which set of benchmarks.
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*/
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netdev_info(dev, "Running with NAPI enabled\n");
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for (i = 0; i < priv->num_rx_queues; i++)
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netdev_info(dev, "RX BD ring size for Q[%d]: %d\n",
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@ -1398,8 +1403,7 @@ static phy_interface_t gfar_get_interface(struct net_device *dev)
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else {
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phy_interface_t interface = priv->interface;
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/*
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* This isn't autodetected right now, so it must
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/* This isn't autodetected right now, so it must
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* be set by the device tree or platform code.
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*/
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if (interface == PHY_INTERFACE_MODE_RGMII_ID)
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@ -1453,8 +1457,7 @@ static int init_phy(struct net_device *dev)
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return 0;
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}
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/*
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* Initialize TBI PHY interface for communicating with the
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/* Initialize TBI PHY interface for communicating with the
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* SERDES lynx PHY on the chip. We communicate with this PHY
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* through the MDIO bus on each controller, treating it as a
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* "normal" PHY at the address found in the TBIPA register. We assume
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@ -1479,8 +1482,7 @@ static void gfar_configure_serdes(struct net_device *dev)
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return;
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}
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/*
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* If the link is already up, we must already be ok, and don't need to
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/* If the link is already up, we must already be ok, and don't need to
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* configure and reset the TBI<->SerDes link. Maybe U-Boot configured
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* everything for us? Resetting it takes the link down and requires
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* several seconds for it to come back.
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@ -1554,15 +1556,13 @@ static int __gfar_is_rx_idle(struct gfar_private *priv)
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{
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u32 res;
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/*
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* Normaly TSEC should not hang on GRS commands, so we should
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/* Normaly TSEC should not hang on GRS commands, so we should
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* actually wait for IEVENT_GRSC flag.
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*/
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if (likely(!gfar_has_errata(priv, GFAR_ERRATA_A002)))
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return 0;
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/*
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* Read the eTSEC register at offset 0xD1C. If bits 7-14 are
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/* Read the eTSEC register at offset 0xD1C. If bits 7-14 are
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* the same as bits 23-30, the eTSEC Rx is assumed to be idle
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* and the Rx can be safely reset.
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*/
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@ -1718,7 +1718,8 @@ static void free_skb_rx_queue(struct gfar_priv_rx_q *rx_queue)
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}
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/* If there are any tx skbs or rx skbs still around, free them.
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* Then free tx_skbuff and rx_skbuff */
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* Then free tx_skbuff and rx_skbuff
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*/
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static void free_skb_resources(struct gfar_private *priv)
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{
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struct gfar_priv_tx_q *tx_queue = NULL;
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@ -1827,10 +1828,12 @@ static int register_grp_irqs(struct gfar_priv_grp *grp)
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int err;
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/* If the device has multiple interrupts, register for
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* them. Otherwise, only register for the one */
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* them. Otherwise, only register for the one
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*/
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if (priv->device_flags & FSL_GIANFAR_DEV_HAS_MULTI_INTR) {
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/* Install our interrupt handlers for Error,
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* Transmit, and Receive */
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* Transmit, and Receive
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*/
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if ((err = request_irq(grp->interruptError, gfar_error, 0,
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grp->int_name_er,grp)) < 0) {
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netif_err(priv, intr, dev, "Can't get IRQ %d\n",
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@ -1914,8 +1917,9 @@ irq_fail:
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return err;
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}
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/* Called when something needs to use the ethernet device */
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/* Returns 0 for success. */
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/* Called when something needs to use the ethernet device
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* Returns 0 for success.
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*/
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static int gfar_enet_open(struct net_device *dev)
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{
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struct gfar_private *priv = netdev_priv(dev);
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@ -1970,8 +1974,9 @@ static inline void gfar_tx_checksum(struct sk_buff *skb, struct txfcb *fcb,
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*/
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flags = TXFCB_DEFAULT;
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/* Tell the controller what the protocol is */
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/* And provide the already calculated phcs */
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/* Tell the controller what the protocol is
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* And provide the already calculated phcs
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*/
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if (ip_hdr(skb)->protocol == IPPROTO_UDP) {
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flags |= TXFCB_UDP;
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fcb->phcs = udp_hdr(skb)->check;
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@ -1981,7 +1986,8 @@ static inline void gfar_tx_checksum(struct sk_buff *skb, struct txfcb *fcb,
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/* l3os is the distance between the start of the
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* frame (skb->data) and the start of the IP hdr.
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* l4os is the distance between the start of the
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* l3 hdr and the l4 hdr */
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* l3 hdr and the l4 hdr
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*/
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fcb->l3os = (u16)(skb_network_offset(skb) - fcb_length);
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fcb->l4os = skb_network_header_len(skb);
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@ -2008,8 +2014,9 @@ static inline struct txbd8 *next_txbd(struct txbd8 *bdp, struct txbd8 *base,
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return skip_txbd(bdp, 1, base, ring_size);
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}
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/* This is called by the kernel when a frame is ready for transmission. */
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/* It is pointed to by the dev->hard_start_xmit function pointer */
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/* This is called by the kernel when a frame is ready for transmission.
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* It is pointed to by the dev->hard_start_xmit function pointer
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*/
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static int gfar_start_xmit(struct sk_buff *skb, struct net_device *dev)
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{
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struct gfar_private *priv = netdev_priv(dev);
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@ -2024,8 +2031,7 @@ static int gfar_start_xmit(struct sk_buff *skb, struct net_device *dev)
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unsigned long flags;
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unsigned int nr_frags, nr_txbds, length, fcb_length = GMAC_FCB_LEN;
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/*
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* TOE=1 frames larger than 2500 bytes may see excess delays
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/* TOE=1 frames larger than 2500 bytes may see excess delays
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* before start of transmission.
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*/
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if (unlikely(gfar_has_errata(priv, GFAR_ERRATA_76) &&
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@ -2177,8 +2183,7 @@ static int gfar_start_xmit(struct sk_buff *skb, struct net_device *dev)
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txbdp_start->bufPtr = dma_map_single(&priv->ofdev->dev, skb->data,
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skb_headlen(skb), DMA_TO_DEVICE);
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/*
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* If time stamping is requested one additional TxBD must be set up. The
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/* If time stamping is requested one additional TxBD must be set up. The
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* first TxBD points to the FCB and must have a data length of
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* GMAC_FCB_LEN. The second TxBD points to the actual frame data with
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* the full frame length.
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@ -2194,8 +2199,7 @@ static int gfar_start_xmit(struct sk_buff *skb, struct net_device *dev)
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netdev_tx_sent_queue(txq, skb->len);
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/*
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* We can work in parallel with gfar_clean_tx_ring(), except
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/* We can work in parallel with gfar_clean_tx_ring(), except
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* when modifying num_txbdfree. Note that we didn't grab the lock
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* when we were reading the num_txbdfree and checking for available
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* space, that's because outside of this function it can only grow,
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@ -2208,8 +2212,7 @@ static int gfar_start_xmit(struct sk_buff *skb, struct net_device *dev)
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*/
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spin_lock_irqsave(&tx_queue->txlock, flags);
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/*
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* The powerpc-specific eieio() is used, as wmb() has too strong
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/* The powerpc-specific eieio() is used, as wmb() has too strong
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* semantics (it requires synchronization between cacheable and
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* uncacheable mappings, which eieio doesn't provide and which we
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* don't need), thus requiring a more expensive sync instruction. At
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@ -2225,7 +2228,8 @@ static int gfar_start_xmit(struct sk_buff *skb, struct net_device *dev)
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tx_queue->tx_skbuff[tx_queue->skb_curtx] = skb;
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/* Update the current skb pointer to the next entry we will use
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* (wrapping if necessary) */
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* (wrapping if necessary)
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*/
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tx_queue->skb_curtx = (tx_queue->skb_curtx + 1) &
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TX_RING_MOD_MASK(tx_queue->tx_ring_size);
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@ -2235,7 +2239,8 @@ static int gfar_start_xmit(struct sk_buff *skb, struct net_device *dev)
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tx_queue->num_txbdfree -= (nr_txbds);
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/* If the next BD still needs to be cleaned up, then the bds
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are full. We need to tell the kernel to stop sending us stuff. */
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* are full. We need to tell the kernel to stop sending us stuff.
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*/
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if (!tx_queue->num_txbdfree) {
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netif_tx_stop_queue(txq);
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@ -2365,7 +2370,8 @@ static int gfar_change_mtu(struct net_device *dev, int new_mtu)
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INCREMENTAL_BUFFER_SIZE;
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/* Only stop and start the controller if it isn't already
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* stopped, and we changed something */
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* stopped, and we changed something
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*/
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if ((oldsize != tempsize) && (dev->flags & IFF_UP))
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stop_gfar(dev);
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@ -2378,7 +2384,8 @@ static int gfar_change_mtu(struct net_device *dev, int new_mtu)
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/* If the mtu is larger than the max size for standard
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* ethernet frames (ie, a jumbo frame), then set maccfg2
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* to allow huge frames, and to check the length */
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* to allow huge frames, and to check the length
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*/
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tempval = gfar_read(®s->maccfg2);
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if (priv->rx_buffer_size > DEFAULT_RX_BUFFER_SIZE ||
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@ -2464,8 +2471,7 @@ static int gfar_clean_tx_ring(struct gfar_priv_tx_q *tx_queue)
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frags = skb_shinfo(skb)->nr_frags;
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/*
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* When time stamping, one additional TxBD must be freed.
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/* When time stamping, one additional TxBD must be freed.
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* Also, we need to dma_unmap_single() the TxPAL.
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*/
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if (unlikely(skb_shinfo(skb)->tx_flags & SKBTX_IN_PROGRESS))
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@ -2516,8 +2522,7 @@ static int gfar_clean_tx_ring(struct gfar_priv_tx_q *tx_queue)
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bytes_sent += skb->len;
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/*
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* If there's room in the queue (limit it to rx_buffer_size)
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/* If there's room in the queue (limit it to rx_buffer_size)
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* we add this skb back into the pool, if it's the right size
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*/
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if (skb_queue_len(&priv->rx_recycle) < rx_queue->rx_ring_size &&
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@ -2561,8 +2566,7 @@ static void gfar_schedule_cleanup(struct gfar_priv_grp *gfargrp)
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gfar_write(&gfargrp->regs->imask, IMASK_RTX_DISABLED);
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__napi_schedule(&gfargrp->napi);
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} else {
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/*
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* Clear IEVENT, so interrupts aren't called again
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/* Clear IEVENT, so interrupts aren't called again
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* because of the packets that have already arrived.
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*/
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gfar_write(&gfargrp->regs->ievent, IEVENT_RTX_MASK);
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@ -2622,8 +2626,7 @@ static inline void count_errors(unsigned short status, struct net_device *dev)
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struct net_device_stats *stats = &dev->stats;
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struct gfar_extra_stats *estats = &priv->extra_stats;
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/* If the packet was truncated, none of the other errors
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* matter */
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/* If the packet was truncated, none of the other errors matter */
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if (status & RXBD_TRUNCATED) {
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stats->rx_length_errors++;
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@ -2664,7 +2667,8 @@ static inline void gfar_rx_checksum(struct sk_buff *skb, struct rxfcb *fcb)
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{
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/* If valid headers were found, and valid sums
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* were verified, then we tell the kernel that no
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* checksumming is necessary. Otherwise, it is */
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* checksumming is necessary. Otherwise, it is [FIXME]
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*/
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if ((fcb->flags & RXFCB_CSUM_MASK) == (RXFCB_CIP | RXFCB_CTU))
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skb->ip_summed = CHECKSUM_UNNECESSARY;
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else
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@ -2672,8 +2676,7 @@ static inline void gfar_rx_checksum(struct sk_buff *skb, struct rxfcb *fcb)
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}
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/* gfar_process_frame() -- handle one incoming packet if skb
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* isn't NULL. */
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/* gfar_process_frame() -- handle one incoming packet if skb isn't NULL. */
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static int gfar_process_frame(struct net_device *dev, struct sk_buff *skb,
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int amount_pull, struct napi_struct *napi)
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{
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@ -2685,8 +2688,9 @@ static int gfar_process_frame(struct net_device *dev, struct sk_buff *skb,
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/* fcb is at the beginning if exists */
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fcb = (struct rxfcb *)skb->data;
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/* Remove the FCB from the skb */
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/* Remove the padded bytes, if there are any */
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/* Remove the FCB from the skb
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* Remove the padded bytes, if there are any
|
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*/
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if (amount_pull) {
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skb_record_rx_queue(skb, fcb->rq);
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skb_pull(skb, amount_pull);
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@ -2709,8 +2713,7 @@ static int gfar_process_frame(struct net_device *dev, struct sk_buff *skb,
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/* Tell the skb what kind of packet this is */
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skb->protocol = eth_type_trans(skb, dev);
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/*
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* There's need to check for NETIF_F_HW_VLAN_RX here.
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/* There's need to check for NETIF_F_HW_VLAN_RX here.
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* Even if vlan rx accel is disabled, on some chips
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* RXFCB_VLN is pseudo randomly set.
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*/
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@ -2831,7 +2834,8 @@ static int gfar_poll(struct napi_struct *napi, int budget)
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budget_per_queue = budget/num_queues;
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/* Clear IEVENT, so interrupts aren't called again
|
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* because of the packets that have already arrived */
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* because of the packets that have already arrived
|
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*/
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gfar_write(®s->ievent, IEVENT_RTX_MASK);
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while (num_queues && left_over_budget) {
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@ -2869,8 +2873,9 @@ static int gfar_poll(struct napi_struct *napi, int budget)
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|
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gfar_write(®s->imask, IMASK_DEFAULT);
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|
||||
/* If we are coalescing interrupts, update the timer */
|
||||
/* Otherwise, clear it */
|
||||
/* If we are coalescing interrupts, update the timer
|
||||
* Otherwise, clear it
|
||||
*/
|
||||
gfar_configure_coalescing(priv,
|
||||
gfargrp->rx_bit_map, gfargrp->tx_bit_map);
|
||||
}
|
||||
|
|
@ -2879,8 +2884,7 @@ static int gfar_poll(struct napi_struct *napi, int budget)
|
|||
}
|
||||
|
||||
#ifdef CONFIG_NET_POLL_CONTROLLER
|
||||
/*
|
||||
* Polling 'interrupt' - used by things like netconsole to send skbs
|
||||
/* Polling 'interrupt' - used by things like netconsole to send skbs
|
||||
* without having to re-enable interrupts. It's not called while
|
||||
* the interrupt routine is executing.
|
||||
*/
|
||||
|
|
@ -2957,7 +2961,8 @@ static void adjust_link(struct net_device *dev)
|
|||
u32 ecntrl = gfar_read(®s->ecntrl);
|
||||
|
||||
/* Now we make sure that we can be in full duplex mode.
|
||||
* If not, we operate in half-duplex mode. */
|
||||
* If not, we operate in half-duplex mode.
|
||||
*/
|
||||
if (phydev->duplex != priv->oldduplex) {
|
||||
new_state = 1;
|
||||
if (!(phydev->duplex))
|
||||
|
|
@ -2983,7 +2988,8 @@ static void adjust_link(struct net_device *dev)
|
|||
((tempval & ~(MACCFG2_IF)) | MACCFG2_MII);
|
||||
|
||||
/* Reduced mode distinguishes
|
||||
* between 10 and 100 */
|
||||
* between 10 and 100
|
||||
*/
|
||||
if (phydev->speed == SPEED_100)
|
||||
ecntrl |= ECNTRL_R100;
|
||||
else
|
||||
|
|
@ -3022,7 +3028,8 @@ static void adjust_link(struct net_device *dev)
|
|||
/* Update the hash table based on the current list of multicast
|
||||
* addresses we subscribe to. Also, change the promiscuity of
|
||||
* the device based on the flags (this function is called
|
||||
* whenever dev->flags is changed */
|
||||
* whenever dev->flags is changed
|
||||
*/
|
||||
static void gfar_set_multi(struct net_device *dev)
|
||||
{
|
||||
struct netdev_hw_addr *ha;
|
||||
|
|
@ -3084,7 +3091,8 @@ static void gfar_set_multi(struct net_device *dev)
|
|||
|
||||
/* If we have extended hash tables, we need to
|
||||
* clear the exact match registers to prepare for
|
||||
* setting them */
|
||||
* setting them
|
||||
*/
|
||||
if (priv->extended_hash) {
|
||||
em_num = GFAR_EM_NUM + 1;
|
||||
gfar_clear_exact_match(dev);
|
||||
|
|
@ -3110,7 +3118,8 @@ static void gfar_set_multi(struct net_device *dev)
|
|||
|
||||
|
||||
/* Clears each of the exact match registers to zero, so they
|
||||
* don't interfere with normal reception */
|
||||
* don't interfere with normal reception
|
||||
*/
|
||||
static void gfar_clear_exact_match(struct net_device *dev)
|
||||
{
|
||||
int idx;
|
||||
|
|
@ -3132,7 +3141,8 @@ static void gfar_clear_exact_match(struct net_device *dev)
|
|||
* hash index which gaddr register to use, and the 5 other bits
|
||||
* indicate which bit (assuming an IBM numbering scheme, which
|
||||
* for PowerPC (tm) is usually the case) in the register holds
|
||||
* the entry. */
|
||||
* the entry.
|
||||
*/
|
||||
static void gfar_set_hash_for_addr(struct net_device *dev, u8 *addr)
|
||||
{
|
||||
u32 tempval;
|
||||
|
|
@ -3164,8 +3174,9 @@ static void gfar_set_mac_for_addr(struct net_device *dev, int num,
|
|||
|
||||
macptr += num*2;
|
||||
|
||||
/* Now copy it into the mac registers backwards, cuz */
|
||||
/* little endian is silly */
|
||||
/* Now copy it into the mac registers backwards, cuz
|
||||
* little endian is silly
|
||||
*/
|
||||
for (idx = 0; idx < ETH_ALEN; idx++)
|
||||
tmpbuf[ETH_ALEN - 1 - idx] = addr[idx];
|
||||
|
||||
|
|
|
|||
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