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linux/drivers/net/ps3_gelic_net.c

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/*
* PS3 gelic network driver.
*
* Copyright (C) 2007 Sony Computer Entertainment Inc.
* Copyright 2006, 2007 Sony Corporation
*
* This file is based on: spider_net.c
*
* (C) Copyright IBM Corp. 2005
*
* Authors : Utz Bacher <utz.bacher@de.ibm.com>
* Jens Osterkamp <Jens.Osterkamp@de.ibm.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#undef DEBUG
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/etherdevice.h>
#include <linux/ethtool.h>
#include <linux/if_vlan.h>
#include <linux/in.h>
#include <linux/ip.h>
#include <linux/tcp.h>
#include <linux/dma-mapping.h>
#include <net/checksum.h>
#include <asm/firmware.h>
#include <asm/ps3.h>
#include <asm/lv1call.h>
#include "ps3_gelic_net.h"
#define DRV_NAME "Gelic Network Driver"
#define DRV_VERSION "1.0"
MODULE_AUTHOR("SCE Inc.");
MODULE_DESCRIPTION("Gelic Network driver");
MODULE_LICENSE("GPL");
static inline struct device *ctodev(struct gelic_net_card *card)
{
return &card->dev->core;
}
static inline unsigned int bus_id(struct gelic_net_card *card)
{
return card->dev->bus_id;
}
static inline unsigned int dev_id(struct gelic_net_card *card)
{
return card->dev->dev_id;
}
/* set irq_mask */
static int gelic_net_set_irq_mask(struct gelic_net_card *card, u64 mask)
{
int status;
status = lv1_net_set_interrupt_mask(bus_id(card), dev_id(card),
mask, 0);
if (status)
dev_info(ctodev(card),
"lv1_net_set_interrupt_mask failed %d\n", status);
return status;
}
static inline void gelic_net_rx_irq_on(struct gelic_net_card *card)
{
gelic_net_set_irq_mask(card, card->ghiintmask | GELIC_NET_RXINT);
}
static inline void gelic_net_rx_irq_off(struct gelic_net_card *card)
{
gelic_net_set_irq_mask(card, card->ghiintmask & ~GELIC_NET_RXINT);
}
/**
* gelic_net_get_descr_status -- returns the status of a descriptor
* @descr: descriptor to look at
*
* returns the status as in the dmac_cmd_status field of the descriptor
*/
static enum gelic_net_descr_status
gelic_net_get_descr_status(struct gelic_net_descr *descr)
{
u32 cmd_status;
cmd_status = descr->dmac_cmd_status;
cmd_status >>= GELIC_NET_DESCR_IND_PROC_SHIFT;
return cmd_status;
}
/**
* gelic_net_set_descr_status -- sets the status of a descriptor
* @descr: descriptor to change
* @status: status to set in the descriptor
*
* changes the status to the specified value. Doesn't change other bits
* in the status
*/
static void gelic_net_set_descr_status(struct gelic_net_descr *descr,
enum gelic_net_descr_status status)
{
u32 cmd_status;
/* read the status */
cmd_status = descr->dmac_cmd_status;
/* clean the upper 4 bits */
cmd_status &= GELIC_NET_DESCR_IND_PROC_MASKO;
/* add the status to it */
cmd_status |= ((u32)status) << GELIC_NET_DESCR_IND_PROC_SHIFT;
/* and write it back */
descr->dmac_cmd_status = cmd_status;
/*
* dma_cmd_status field is used to indicate whether the descriptor
* is valid or not.
* Usually caller of this function wants to inform that to the
* hardware, so we assure here the hardware sees the change.
*/
wmb();
}
/**
* gelic_net_free_chain - free descriptor chain
* @card: card structure
* @descr_in: address of desc
*/
static void gelic_net_free_chain(struct gelic_net_card *card,
struct gelic_net_descr *descr_in)
{
struct gelic_net_descr *descr;
for (descr = descr_in; descr && descr->bus_addr; descr = descr->next) {
dma_unmap_single(ctodev(card), descr->bus_addr,
GELIC_NET_DESCR_SIZE, DMA_BIDIRECTIONAL);
descr->bus_addr = 0;
}
}
/**
* gelic_net_init_chain - links descriptor chain
* @card: card structure
* @chain: address of chain
* @start_descr: address of descriptor array
* @no: number of descriptors
*
* we manage a circular list that mirrors the hardware structure,
* except that the hardware uses bus addresses.
*
* returns 0 on success, <0 on failure
*/
static int gelic_net_init_chain(struct gelic_net_card *card,
struct gelic_net_descr_chain *chain,
struct gelic_net_descr *start_descr, int no)
{
int i;
struct gelic_net_descr *descr;
descr = start_descr;
memset(descr, 0, sizeof(*descr) * no);
/* set up the hardware pointers in each descriptor */
for (i = 0; i < no; i++, descr++) {
gelic_net_set_descr_status(descr, GELIC_NET_DESCR_NOT_IN_USE);
descr->bus_addr =
dma_map_single(ctodev(card), descr,
GELIC_NET_DESCR_SIZE,
DMA_BIDIRECTIONAL);
if (!descr->bus_addr)
goto iommu_error;
descr->next = descr + 1;
descr->prev = descr - 1;
}
/* make them as ring */
(descr - 1)->next = start_descr;
start_descr->prev = (descr - 1);
/* chain bus addr of hw descriptor */
descr = start_descr;
for (i = 0; i < no; i++, descr++) {
descr->next_descr_addr = descr->next->bus_addr;
}
chain->head = start_descr;
chain->tail = start_descr;
/* do not chain last hw descriptor */
(descr - 1)->next_descr_addr = 0;
return 0;
iommu_error:
for (i--, descr--; 0 <= i; i--, descr--)
if (descr->bus_addr)
dma_unmap_single(ctodev(card), descr->bus_addr,
GELIC_NET_DESCR_SIZE,
DMA_BIDIRECTIONAL);
return -ENOMEM;
}
/**
* gelic_net_prepare_rx_descr - reinitializes a rx descriptor
* @card: card structure
* @descr: descriptor to re-init
*
* return 0 on succes, <0 on failure
*
* allocates a new rx skb, iommu-maps it and attaches it to the descriptor.
* Activate the descriptor state-wise
*/
static int gelic_net_prepare_rx_descr(struct gelic_net_card *card,
struct gelic_net_descr *descr)
{
int offset;
unsigned int bufsize;
if (gelic_net_get_descr_status(descr) != GELIC_NET_DESCR_NOT_IN_USE) {
dev_info(ctodev(card), "%s: ERROR status \n", __func__);
}
/* we need to round up the buffer size to a multiple of 128 */
bufsize = ALIGN(GELIC_NET_MAX_MTU, GELIC_NET_RXBUF_ALIGN);
/* and we need to have it 128 byte aligned, therefore we allocate a
* bit more */
descr->skb = netdev_alloc_skb(card->netdev,
bufsize + GELIC_NET_RXBUF_ALIGN - 1);
if (!descr->skb) {
descr->buf_addr = 0; /* tell DMAC don't touch memory */
dev_info(ctodev(card),
"%s:allocate skb failed !!\n", __func__);
return -ENOMEM;
}
descr->buf_size = bufsize;
descr->dmac_cmd_status = 0;
descr->result_size = 0;
descr->valid_size = 0;
descr->data_error = 0;
offset = ((unsigned long)descr->skb->data) &
(GELIC_NET_RXBUF_ALIGN - 1);
if (offset)
skb_reserve(descr->skb, GELIC_NET_RXBUF_ALIGN - offset);
/* io-mmu-map the skb */
descr->buf_addr = dma_map_single(ctodev(card), descr->skb->data,
GELIC_NET_MAX_MTU,
DMA_FROM_DEVICE);
if (!descr->buf_addr) {
dev_kfree_skb_any(descr->skb);
descr->skb = NULL;
dev_info(ctodev(card),
"%s:Could not iommu-map rx buffer\n", __func__);
gelic_net_set_descr_status(descr, GELIC_NET_DESCR_NOT_IN_USE);
return -ENOMEM;
} else {
gelic_net_set_descr_status(descr, GELIC_NET_DESCR_CARDOWNED);
return 0;
}
}
/**
* gelic_net_release_rx_chain - free all skb of rx descr
* @card: card structure
*
*/
static void gelic_net_release_rx_chain(struct gelic_net_card *card)
{
struct gelic_net_descr *descr = card->rx_chain.head;
do {
if (descr->skb) {
dma_unmap_single(ctodev(card),
descr->buf_addr,
descr->skb->len,
DMA_FROM_DEVICE);
descr->buf_addr = 0;
dev_kfree_skb_any(descr->skb);
descr->skb = NULL;
descr->dmac_cmd_status = GELIC_NET_DESCR_NOT_IN_USE;
}
descr = descr->next;
} while (descr != card->rx_chain.head);
}
/**
* gelic_net_fill_rx_chain - fills descriptors/skbs in the rx chains
* @card: card structure
*
* fills all descriptors in the rx chain: allocates skbs
* and iommu-maps them.
* returns 0 on success, <0 on failure
*/
static int gelic_net_fill_rx_chain(struct gelic_net_card *card)
{
struct gelic_net_descr *descr = card->rx_chain.head;
int ret;
do {
if (!descr->skb) {
ret = gelic_net_prepare_rx_descr(card, descr);
if (ret)
goto rewind;
}
descr = descr->next;
} while (descr != card->rx_chain.head);
return 0;
rewind:
gelic_net_release_rx_chain(card);
return ret;
}
/**
* gelic_net_alloc_rx_skbs - allocates rx skbs in rx descriptor chains
* @card: card structure
*
* returns 0 on success, <0 on failure
*/
static int gelic_net_alloc_rx_skbs(struct gelic_net_card *card)
{
struct gelic_net_descr_chain *chain;
int ret;
chain = &card->rx_chain;
ret = gelic_net_fill_rx_chain(card);
chain->head = card->rx_top->prev; /* point to the last */
return ret;
}
/**
* gelic_net_release_tx_descr - processes a used tx descriptor
* @card: card structure
* @descr: descriptor to release
*
* releases a used tx descriptor (unmapping, freeing of skb)
*/
static void gelic_net_release_tx_descr(struct gelic_net_card *card,
struct gelic_net_descr *descr)
{
struct sk_buff *skb;
if (descr->data_status & (1 << GELIC_NET_TXDESC_TAIL)) {
/* 2nd descriptor */
skb = descr->skb;
dma_unmap_single(ctodev(card), descr->buf_addr, skb->len,
DMA_TO_DEVICE);
dev_kfree_skb_any(skb);
} else {
dma_unmap_single(ctodev(card), descr->buf_addr,
descr->buf_size, DMA_TO_DEVICE);
}
descr->buf_addr = 0;
descr->buf_size = 0;
descr->next_descr_addr = 0;
descr->result_size = 0;
descr->valid_size = 0;
descr->data_status = 0;
descr->data_error = 0;
descr->skb = NULL;
/* set descr status */
descr->dmac_cmd_status = GELIC_NET_DMAC_CMDSTAT_NOT_IN_USE;
}
/**
* gelic_net_release_tx_chain - processes sent tx descriptors
* @card: adapter structure
* @stop: net_stop sequence
*
* releases the tx descriptors that gelic has finished with
*/
static void gelic_net_release_tx_chain(struct gelic_net_card *card, int stop)
{
struct gelic_net_descr_chain *tx_chain;
enum gelic_net_descr_status status;
int release = 0;
for (tx_chain = &card->tx_chain;
tx_chain->head != tx_chain->tail && tx_chain->tail;
tx_chain->tail = tx_chain->tail->next) {
status = gelic_net_get_descr_status(tx_chain->tail);
switch (status) {
case GELIC_NET_DESCR_RESPONSE_ERROR:
case GELIC_NET_DESCR_PROTECTION_ERROR:
case GELIC_NET_DESCR_FORCE_END:
if (printk_ratelimit())
dev_info(ctodev(card),
"%s: forcing end of tx descriptor " \
"with status %x\n",
__func__, status);
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;
break;
case GELIC_NET_DESCR_CARDOWNED:
/* pending tx request */
default:
/* any other value (== GELIC_NET_DESCR_NOT_IN_USE) */
goto out;
}
gelic_net_release_tx_descr(card, tx_chain->tail);
release = 1;
}
out:
if (!stop && release)
netif_wake_queue(card->netdev);
}
/**
* gelic_net_set_multi - sets multicast addresses and promisc flags
* @netdev: interface device structure
*
* gelic_net_set_multi configures multicast addresses as needed for the
* netdev interface. It also sets up multicast, allmulti and promisc
* flags appropriately
*/
static void gelic_net_set_multi(struct net_device *netdev)
{
struct gelic_net_card *card = netdev_priv(netdev);
struct dev_mc_list *mc;
unsigned int i;
uint8_t *p;
u64 addr;
int status;
/* clear all multicast address */
status = lv1_net_remove_multicast_address(bus_id(card), dev_id(card),
0, 1);
if (status)
dev_err(ctodev(card),
"lv1_net_remove_multicast_address failed %d\n",
status);
/* set broadcast address */
status = lv1_net_add_multicast_address(bus_id(card), dev_id(card),
GELIC_NET_BROADCAST_ADDR, 0);
if (status)
dev_err(ctodev(card),
"lv1_net_add_multicast_address failed, %d\n",
status);
if (netdev->flags & IFF_ALLMULTI
|| netdev->mc_count > GELIC_NET_MC_COUNT_MAX) { /* list max */
status = lv1_net_add_multicast_address(bus_id(card),
dev_id(card),
0, 1);
if (status)
dev_err(ctodev(card),
"lv1_net_add_multicast_address failed, %d\n",
status);
return;
}
/* set multicast address */
for (mc = netdev->mc_list; mc; mc = mc->next) {
addr = 0;
p = mc->dmi_addr;
for (i = 0; i < ETH_ALEN; i++) {
addr <<= 8;
addr |= *p++;
}
status = lv1_net_add_multicast_address(bus_id(card),
dev_id(card),
addr, 0);
if (status)
dev_err(ctodev(card),
"lv1_net_add_multicast_address failed, %d\n",
status);
}
}
/**
* gelic_net_enable_rxdmac - enables the receive DMA controller
* @card: card structure
*
* gelic_net_enable_rxdmac enables the DMA controller by setting RX_DMA_EN
* in the GDADMACCNTR register
*/
static inline void gelic_net_enable_rxdmac(struct gelic_net_card *card)
{
int status;
status = lv1_net_start_rx_dma(bus_id(card), dev_id(card),
card->rx_chain.tail->bus_addr, 0);
if (status)
dev_info(ctodev(card),
"lv1_net_start_rx_dma failed, status=%d\n", status);
}
/**
* gelic_net_disable_rxdmac - disables the receive DMA controller
* @card: card structure
*
* gelic_net_disable_rxdmac terminates processing on the DMA controller by
* turing off DMA and issueing a force end
*/
static inline void gelic_net_disable_rxdmac(struct gelic_net_card *card)
{
int status;
/* this hvc blocks until the DMA in progress really stopped */
status = lv1_net_stop_rx_dma(bus_id(card), dev_id(card), 0);
if (status)
dev_err(ctodev(card),
"lv1_net_stop_rx_dma faild, %d\n", status);
}
/**
* gelic_net_disable_txdmac - disables the transmit DMA controller
* @card: card structure
*
* gelic_net_disable_txdmac terminates processing on the DMA controller by
* turing off DMA and issueing a force end
*/
static inline void gelic_net_disable_txdmac(struct gelic_net_card *card)
{
int status;
/* this hvc blocks until the DMA in progress really stopped */
status = lv1_net_stop_tx_dma(bus_id(card), dev_id(card), 0);
if (status)
dev_err(ctodev(card),
"lv1_net_stop_tx_dma faild, status=%d\n", status);
}
/**
* gelic_net_stop - called upon ifconfig down
* @netdev: interface device structure
*
* always returns 0
*/
static int gelic_net_stop(struct net_device *netdev)
{
struct gelic_net_card *card = netdev_priv(netdev);
netif_poll_disable(netdev);
netif_stop_queue(netdev);
/* turn off DMA, force end */
gelic_net_disable_rxdmac(card);
gelic_net_disable_txdmac(card);
gelic_net_set_irq_mask(card, 0);
/* disconnect event port */
free_irq(card->netdev->irq, card->netdev);
ps3_sb_event_receive_port_destroy(card->dev, card->netdev->irq);
card->netdev->irq = NO_IRQ;
netif_carrier_off(netdev);
/* release chains */
gelic_net_release_tx_chain(card, 1);
gelic_net_release_rx_chain(card);
gelic_net_free_chain(card, card->tx_top);
gelic_net_free_chain(card, card->rx_top);
return 0;
}
/**
* gelic_net_get_next_tx_descr - returns the next available tx descriptor
* @card: device structure to get descriptor from
*
* returns the address of the next descriptor, or NULL if not available.
*/
static struct gelic_net_descr *
gelic_net_get_next_tx_descr(struct gelic_net_card *card)
{
if (!card->tx_chain.head)
return NULL;
/* see if we can two consecutive free descrs */
if (card->tx_chain.tail != card->tx_chain.head->next &&
gelic_net_get_descr_status(card->tx_chain.head) ==
GELIC_NET_DESCR_NOT_IN_USE &&
card->tx_chain.tail != card->tx_chain.head->next->next &&
gelic_net_get_descr_status(card->tx_chain.head->next) ==
GELIC_NET_DESCR_NOT_IN_USE )
return card->tx_chain.head;
else
return NULL;
}
/**
* gelic_net_set_txdescr_cmdstat - sets the tx descriptor command field
* @descr: descriptor structure to fill out
* @skb: packet to consider
* @middle: middle of frame
*
* fills out the command and status field of the descriptor structure,
* depending on hardware checksum settings. This function assumes a wmb()
* has executed before.
*/
static void gelic_net_set_txdescr_cmdstat(struct gelic_net_descr *descr,
struct sk_buff *skb, int middle)
{
u32 eofr;
if (middle)
eofr = 0;
else
eofr = GELIC_NET_DMAC_CMDSTAT_END_FRAME;
if (skb->ip_summed != CHECKSUM_PARTIAL)
descr->dmac_cmd_status = GELIC_NET_DMAC_CMDSTAT_NOCS | eofr;
else {
/* is packet ip?
* if yes: tcp? udp? */
if (skb->protocol == htons(ETH_P_IP)) {
if (ip_hdr(skb)->protocol == IPPROTO_TCP)
descr->dmac_cmd_status =
GELIC_NET_DMAC_CMDSTAT_TCPCS | eofr;
else if (ip_hdr(skb)->protocol == IPPROTO_UDP)
descr->dmac_cmd_status =
GELIC_NET_DMAC_CMDSTAT_UDPCS | eofr;
else /*
* the stack should checksum non-tcp and non-udp
* packets on his own: NETIF_F_IP_CSUM
*/
descr->dmac_cmd_status =
GELIC_NET_DMAC_CMDSTAT_NOCS | eofr;
}
}
}
/**
* gelic_net_prepare_tx_descr_v - get dma address of skb_data
* @card: card structure
* @descr: descriptor structure
* @skb: packet to use
*
* returns 0 on success, <0 on failure.
*
*/
static int gelic_net_prepare_tx_descr_v(struct gelic_net_card *card,
struct gelic_net_descr *descr,
struct sk_buff *skb)
{
dma_addr_t buf[2];
unsigned int vlan_len;
if (skb->len < GELIC_NET_VLAN_POS)
return -EINVAL;
memcpy(&descr->vlan, skb->data, GELIC_NET_VLAN_POS);
if (card->vlan_index != -1) {
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 */
/* first descr */
buf[0] = dma_map_single(ctodev(card), &descr->vlan,
vlan_len, DMA_TO_DEVICE);
if (!buf[0]) {
dev_err(ctodev(card),
"dma map 1 failed (%p, %i). Dropping packet\n",
skb->data, vlan_len);
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);
if (!buf[1]) {
dev_err(ctodev(card),
"dma map 2 failed (%p, %i). Dropping packet\n",
skb->data + GELIC_NET_VLAN_POS,
skb->len - GELIC_NET_VLAN_POS);
dma_unmap_single(ctodev(card), buf[0], vlan_len,
DMA_TO_DEVICE);
return -ENOMEM;
}
descr->buf_addr = buf[1];
descr->buf_size = skb->len - GELIC_NET_VLAN_POS;
descr->skb = skb;
descr->data_status = 0;
descr->next_descr_addr = 0; /* terminate hw descr */
gelic_net_set_txdescr_cmdstat(descr, skb, 0);
return 0;
}
/**
* gelic_net_kick_txdma - enables TX DMA processing
* @card: card structure
* @descr: descriptor address to enable TX processing at
*
*/
static int gelic_net_kick_txdma(struct gelic_net_card *card,
struct gelic_net_descr *descr)
{
int status = -ENXIO;
int count = 10;
if (card->tx_dma_progress)
return 0;
if (gelic_net_get_descr_status(descr) == GELIC_NET_DESCR_CARDOWNED) {
card->tx_dma_progress = 1;
/* sometimes we need retry here */
while (count--) {
status = lv1_net_start_tx_dma(bus_id(card),
dev_id(card),
descr->bus_addr, 0);
if (!status)
break;
}
if (!count)
dev_info(ctodev(card), "lv1_net_start_txdma failed," \
"status=%d %#lx\n",
status, card->irq_status);
}
return status;
}
/**
* gelic_net_xmit - transmits a frame over the device
* @skb: packet to send out
* @netdev: interface device structure
*
* returns 0 on success, <0 on failure
*/
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;
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) {
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:
/*
* 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;
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;
}
/**
* gelic_net_pass_skb_up - takes an skb from a descriptor and passes it on
* @descr: descriptor to process
* @card: card structure
*
* iommu-unmaps the skb, fills out skb structure and passes the data to the
* stack. The descriptor state is not changed.
*/
static void gelic_net_pass_skb_up(struct gelic_net_descr *descr,
struct gelic_net_card *card)
{
struct sk_buff *skb;
struct net_device *netdev;
u32 data_status, data_error;
data_status = descr->data_status;
data_error = descr->data_error;
netdev = card->netdev;
/* unmap skb buffer */
skb = descr->skb;
dma_unmap_single(ctodev(card), descr->buf_addr, GELIC_NET_MAX_MTU,
DMA_FROM_DEVICE);
skb_put(skb, descr->valid_size? descr->valid_size : descr->result_size);
if (!descr->valid_size)
dev_info(ctodev(card), "buffer full %x %x %x\n",
descr->result_size, descr->buf_size,
descr->dmac_cmd_status);
descr->skb = NULL;
/*
* the card put 2 bytes vlan tag in front
* of the ethernet frame
*/
skb_pull(skb, 2);
skb->protocol = eth_type_trans(skb, netdev);
/* checksum offload */
if (card->rx_csum) {
if ((data_status & GELIC_NET_DATA_STATUS_CHK_MASK) &&
(!(data_error & GELIC_NET_DATA_ERROR_CHK_MASK)))
skb->ip_summed = CHECKSUM_UNNECESSARY;
else
skb->ip_summed = CHECKSUM_NONE;
} else
skb->ip_summed = CHECKSUM_NONE;
/* update netdevice statistics */
card->netdev_stats.rx_packets++;
card->netdev_stats.rx_bytes += skb->len;
/* pass skb up to stack */
netif_receive_skb(skb);
}
/**
* gelic_net_decode_one_descr - processes an rx descriptor
* @card: card structure
*
* returns 1 if a packet has been sent to the stack, otherwise 0
*
* processes an rx descriptor by iommu-unmapping the data buffer and passing
* the packet up to the stack
*/
static int gelic_net_decode_one_descr(struct gelic_net_card *card)
{
enum gelic_net_descr_status status;
struct gelic_net_descr_chain *chain = &card->rx_chain;
struct gelic_net_descr *descr = chain->tail;
int dmac_chain_ended;
status = gelic_net_get_descr_status(descr);
/* is this descriptor terminated with next_descr == NULL? */
dmac_chain_ended =
descr->dmac_cmd_status & GELIC_NET_DMAC_CMDSTAT_RXDCEIS;
if (status == GELIC_NET_DESCR_CARDOWNED)
return 0;
if (status == GELIC_NET_DESCR_NOT_IN_USE) {
dev_dbg(ctodev(card), "dormant descr? %p\n", descr);
return 0;
}
if ((status == GELIC_NET_DESCR_RESPONSE_ERROR) ||
(status == GELIC_NET_DESCR_PROTECTION_ERROR) ||
(status == GELIC_NET_DESCR_FORCE_END)) {
dev_info(ctodev(card), "dropping RX descriptor with state %x\n",
status);
card->netdev_stats.rx_dropped++;
goto refill;
}
if ((status != GELIC_NET_DESCR_COMPLETE) &&
(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 */
refill:
descr->next_descr_addr = 0; /* unlink the descr */
/* 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
*/
gelic_net_prepare_rx_descr(card, descr);
chain->head = descr;
chain->tail = descr->next;
descr->prev->next_descr_addr = descr->bus_addr;
if (dmac_chain_ended) {
gelic_net_enable_rxdmac(card);
dev_dbg(ctodev(card), "reenable rx dma\n");
}
return 1;
}
/**
* gelic_net_poll - NAPI poll function called by the stack to return packets
* @netdev: interface device structure
* @budget: number of packets we can pass to the stack at most
*
* returns 0 if no more packets available to the driver/stack. Returns 1,
* if the quota is exceeded, but the driver has still packets.
*
*/
static int gelic_net_poll(struct net_device *netdev, int *budget)
{
struct gelic_net_card *card = netdev_priv(netdev);
int packets_to_do, packets_done = 0;
int no_more_packets = 0;
packets_to_do = min(*budget, netdev->quota);
while (packets_to_do) {
if (gelic_net_decode_one_descr(card)) {
packets_done++;
packets_to_do--;
} else {
/* no more packets for the stack */
no_more_packets = 1;
break;
}
}
netdev->quota -= packets_done;
*budget -= packets_done;
if (no_more_packets) {
netif_rx_complete(netdev);
gelic_net_rx_irq_on(card);
return 0;
} 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
* @new_mtu: new MTU value
*
* returns 0 on success, <0 on failure
*/
static int gelic_net_change_mtu(struct net_device *netdev, int new_mtu)
{
/* no need to re-alloc skbs or so -- the max mtu is about 2.3k
* and mtu is outbound only anyway */
if ((new_mtu < GELIC_NET_MIN_MTU) ||
(new_mtu > GELIC_NET_MAX_MTU)) {
return -EINVAL;
}
netdev->mtu = new_mtu;
return 0;
}
/**
* gelic_net_interrupt - event handler for gelic_net
*/
static irqreturn_t gelic_net_interrupt(int irq, void *ptr)
{
unsigned long flags;
struct net_device *netdev = ptr;
struct gelic_net_card *card = netdev_priv(netdev);
u64 status;
status = card->irq_status;
if (!status)
return IRQ_NONE;
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;
spin_unlock_irqrestore(&card->tx_dma_lock, flags);
/* start pending DMA */
gelic_net_xmit(NULL, netdev);
}
return IRQ_HANDLED;
}
#ifdef CONFIG_NET_POLL_CONTROLLER
/**
* gelic_net_poll_controller - artificial interrupt for netconsole etc.
* @netdev: interface device structure
*
* see Documentation/networking/netconsole.txt
*/
static void gelic_net_poll_controller(struct net_device *netdev)
{
struct gelic_net_card *card = netdev_priv(netdev);
gelic_net_set_irq_mask(card, 0);
gelic_net_interrupt(netdev->irq, netdev);
gelic_net_set_irq_mask(card, card->ghiintmask);
}
#endif /* CONFIG_NET_POLL_CONTROLLER */
/**
* gelic_net_open_device - open device and map dma region
* @card: card structure
*/
static int gelic_net_open_device(struct gelic_net_card *card)
{
int result;
result = ps3_sb_event_receive_port_setup(card->dev, PS3_BINDING_CPU_ANY,
&card->netdev->irq);
if (result) {
dev_info(ctodev(card),
"%s:%d: gelic_net_open_device failed (%d)\n",
__func__, __LINE__, result);
result = -EPERM;
goto fail_alloc_irq;
}
result = request_irq(card->netdev->irq, gelic_net_interrupt,
IRQF_DISABLED, "gelic network", card->netdev);
if (result) {
dev_info(ctodev(card), "%s:%d: request_irq failed (%d)\n",
__func__, __LINE__, result);
goto fail_request_irq;
}
return 0;
fail_request_irq:
ps3_sb_event_receive_port_destroy(card->dev, card->netdev->irq);
card->netdev->irq = NO_IRQ;
fail_alloc_irq:
return result;
}
/**
* gelic_net_open - called upon ifonfig up
* @netdev: interface device structure
*
* returns 0 on success, <0 on failure
*
* gelic_net_open allocates all the descriptors and memory needed for
* operation, sets up multicast list and enables interrupts
*/
static int gelic_net_open(struct net_device *netdev)
{
struct gelic_net_card *card = netdev_priv(netdev);
dev_dbg(ctodev(card), " -> %s:%d\n", __func__, __LINE__);
gelic_net_open_device(card);
if (gelic_net_init_chain(card, &card->tx_chain,
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,
GELIC_NET_RX_DESCRIPTORS))
goto alloc_rx_failed;
/* head of chain */
card->tx_top = card->tx_chain.head;
card->rx_top = card->rx_chain.head;
dev_dbg(ctodev(card), "descr rx %p, tx %p, size %#lx, num %#x\n",
card->rx_top, card->tx_top, sizeof(struct gelic_net_descr),
GELIC_NET_RX_DESCRIPTORS);
/* allocate rx skbs */
if (gelic_net_alloc_rx_skbs(card))
goto alloc_skbs_failed;
card->tx_dma_progress = 0;
card->ghiintmask = GELIC_NET_RXINT | GELIC_NET_TXINT;
gelic_net_set_irq_mask(card, card->ghiintmask);
gelic_net_enable_rxdmac(card);
netif_start_queue(netdev);
netif_carrier_on(netdev);
netif_poll_enable(netdev);
return 0;
alloc_skbs_failed:
gelic_net_free_chain(card, card->rx_top);
alloc_rx_failed:
gelic_net_free_chain(card, card->tx_top);
alloc_tx_failed:
return -ENOMEM;
}
#ifdef GELIC_NET_ETHTOOL
static void gelic_net_get_drvinfo (struct net_device *netdev,
struct ethtool_drvinfo *info)
{
strncpy(info->driver, DRV_NAME, sizeof(info->driver) - 1);
strncpy(info->version, DRV_VERSION, sizeof(info->version) - 1);
}
static int gelic_net_get_settings(struct net_device *netdev,
struct ethtool_cmd *cmd)
{
struct gelic_net_card *card = netdev_priv(netdev);
int status;
u64 v1, v2;
int speed, duplex;
speed = duplex = -1;
status = lv1_net_control(bus_id(card), dev_id(card),
GELIC_NET_GET_ETH_PORT_STATUS, GELIC_NET_PORT, 0, 0,
&v1, &v2);
if (status) {
/* link down */
} else {
if (v1 & GELIC_NET_FULL_DUPLEX) {
duplex = DUPLEX_FULL;
} else {
duplex = DUPLEX_HALF;
}
if (v1 & GELIC_NET_SPEED_10 ) {
speed = SPEED_10;
} else if (v1 & GELIC_NET_SPEED_100) {
speed = SPEED_100;
} else if (v1 & GELIC_NET_SPEED_1000) {
speed = SPEED_1000;
}
}
cmd->supported = SUPPORTED_TP | SUPPORTED_Autoneg |
SUPPORTED_10baseT_Half | SUPPORTED_10baseT_Full |
SUPPORTED_100baseT_Half | SUPPORTED_100baseT_Full |
SUPPORTED_1000baseT_Half | SUPPORTED_1000baseT_Full;
cmd->advertising = cmd->supported;
cmd->speed = speed;
cmd->duplex = duplex;
cmd->autoneg = AUTONEG_ENABLE; /* always enabled */
cmd->port = PORT_TP;
return 0;
}
static u32 gelic_net_get_link(struct net_device *netdev)
{
struct gelic_net_card *card = netdev_priv(netdev);
int status;
u64 v1, v2;
int link;
status = lv1_net_control(bus_id(card), dev_id(card),
GELIC_NET_GET_ETH_PORT_STATUS, GELIC_NET_PORT, 0, 0,
&v1, &v2);
if (status)
return 0; /* link down */
if (v1 & GELIC_NET_LINK_UP)
link = 1;
else
link = 0;
return link;
}
static int gelic_net_nway_reset(struct net_device *netdev)
{
if (netif_running(netdev)) {
gelic_net_stop(netdev);
gelic_net_open(netdev);
}
return 0;
}
static u32 gelic_net_get_tx_csum(struct net_device *netdev)
{
return (netdev->features & NETIF_F_IP_CSUM) != 0;
}
static int gelic_net_set_tx_csum(struct net_device *netdev, u32 data)
{
if (data)
netdev->features |= NETIF_F_IP_CSUM;
else
netdev->features &= ~NETIF_F_IP_CSUM;
return 0;
}
static u32 gelic_net_get_rx_csum(struct net_device *netdev)
{
struct gelic_net_card *card = netdev_priv(netdev);
return card->rx_csum;
}
static int gelic_net_set_rx_csum(struct net_device *netdev, u32 data)
{
struct gelic_net_card *card = netdev_priv(netdev);
card->rx_csum = data;
return 0;
}
static struct ethtool_ops gelic_net_ethtool_ops = {
.get_drvinfo = gelic_net_get_drvinfo,
.get_settings = gelic_net_get_settings,
.get_link = gelic_net_get_link,
.nway_reset = gelic_net_nway_reset,
.get_tx_csum = gelic_net_get_tx_csum,
.set_tx_csum = gelic_net_set_tx_csum,
.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
* function (to be called not under interrupt status)
* @work: work is context of tx timout task
*
* called as task when tx hangs, resets interface (if interface is up)
*/
static void gelic_net_tx_timeout_task(struct work_struct *work)
{
struct gelic_net_card *card =
container_of(work, struct gelic_net_card, tx_timeout_task);
struct net_device *netdev = card->netdev;
dev_info(ctodev(card), "%s:Timed out. Restarting... \n", __func__);
if (!(netdev->flags & IFF_UP))
goto out;
netif_device_detach(netdev);
gelic_net_stop(netdev);
gelic_net_open(netdev);
netif_device_attach(netdev);
out:
atomic_dec(&card->tx_timeout_task_counter);
}
/**
* gelic_net_tx_timeout - called when the tx timeout watchdog kicks in.
* @netdev: interface device structure
*
* called, if tx hangs. Schedules a task that resets the interface
*/
static void gelic_net_tx_timeout(struct net_device *netdev)
{
struct gelic_net_card *card;
card = netdev_priv(netdev);
atomic_inc(&card->tx_timeout_task_counter);
if (netdev->flags & IFF_UP)
schedule_work(&card->tx_timeout_task);
else
atomic_dec(&card->tx_timeout_task_counter);
}
/**
* gelic_net_setup_netdev_ops - initialization of net_device operations
* @netdev: net_device structure
*
* fills out function pointers in the net_device structure
*/
static void gelic_net_setup_netdev_ops(struct net_device *netdev)
{
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 */
netdev->tx_timeout = &gelic_net_tx_timeout;
netdev->watchdog_timeo = GELIC_NET_WATCHDOG_TIMEOUT;
/* NAPI */
netdev->poll = &gelic_net_poll;
netdev->weight = GELIC_NET_NAPI_WEIGHT;
#ifdef GELIC_NET_ETHTOOL
netdev->ethtool_ops = &gelic_net_ethtool_ops;
#endif
}
/**
* gelic_net_setup_netdev - initialization of net_device
* @card: card structure
*
* Returns 0 on success or <0 on failure
*
* gelic_net_setup_netdev initializes the net_device structure
**/
static int gelic_net_setup_netdev(struct gelic_net_card *card)
{
struct net_device *netdev = card->netdev;
struct sockaddr addr;
unsigned int i;
int status;
u64 v1, v2;
SET_MODULE_OWNER(netdev);
SET_NETDEV_DEV(netdev, &card->dev->core);
spin_lock_init(&card->tx_dma_lock);
card->rx_csum = GELIC_NET_RX_CSUM_DEFAULT;
gelic_net_setup_netdev_ops(netdev);
netdev->features = NETIF_F_IP_CSUM;
status = lv1_net_control(bus_id(card), dev_id(card),
GELIC_NET_GET_MAC_ADDRESS,
0, 0, 0, &v1, &v2);
if (status || !is_valid_ether_addr((u8 *)&v1)) {
dev_info(ctodev(card),
"%s:lv1_net_control GET_MAC_ADDR failed %d\n",
__func__, status);
return -EINVAL;
}
v1 <<= 16;
memcpy(addr.sa_data, &v1, ETH_ALEN);
memcpy(netdev->dev_addr, addr.sa_data, ETH_ALEN);
dev_info(ctodev(card), "MAC addr %02x:%02x:%02x:%02x:%02x:%02x\n",
netdev->dev_addr[0], netdev->dev_addr[1],
netdev->dev_addr[2], netdev->dev_addr[3],
netdev->dev_addr[4], netdev->dev_addr[5]);
card->vlan_index = -1; /* no vlan */
for (i = 0; i < GELIC_NET_VLAN_MAX; i++) {
status = lv1_net_control(bus_id(card), dev_id(card),
GELIC_NET_GET_VLAN_ID,
i + 1, /* index; one based */
0, 0, &v1, &v2);
if (status == GELIC_NET_VLAN_NO_ENTRY) {
dev_dbg(ctodev(card),
"GELIC_VLAN_ID no entry:%d, VLAN disabled\n",
status);
card->vlan_id[i] = 0;
} else if (status) {
dev_dbg(ctodev(card),
"%s:GELIC_NET_VLAN_ID faild, status=%d\n",
__func__, status);
card->vlan_id[i] = 0;
} else {
card->vlan_id[i] = (u32)v1;
dev_dbg(ctodev(card), "vlan_id:%d, %lx\n", i, v1);
}
}
if (card->vlan_id[GELIC_NET_VLAN_WIRED - 1])
card->vlan_index = GELIC_NET_VLAN_WIRED - 1;
status = register_netdev(netdev);
if (status) {
dev_err(ctodev(card), "%s:Couldn't register net_device: %d\n",
__func__, status);
return status;
}
return 0;
}
/**
* gelic_net_alloc_card - allocates net_device and card structure
*
* returns the card structure or NULL in case of errors
*
* the card and net_device structures are linked to each other
*/
static struct gelic_net_card *gelic_net_alloc_card(void)
{
struct net_device *netdev;
struct gelic_net_card *card;
size_t alloc_size;
alloc_size = sizeof (*card) +
sizeof (struct gelic_net_descr) * GELIC_NET_RX_DESCRIPTORS +
sizeof (struct gelic_net_descr) * GELIC_NET_TX_DESCRIPTORS;
/*
* we assume private data is allocated 32 bytes (or more) aligned
* so that gelic_net_descr should be 32 bytes aligned.
* Current alloc_etherdev() does do it because NETDEV_ALIGN
* is 32.
* check this assumption here.
*/
BUILD_BUG_ON(NETDEV_ALIGN < 32);
BUILD_BUG_ON(offsetof(struct gelic_net_card, irq_status) % 8);
BUILD_BUG_ON(offsetof(struct gelic_net_card, descr) % 32);
netdev = alloc_etherdev(alloc_size);
if (!netdev)
return NULL;
card = netdev_priv(netdev);
card->netdev = netdev;
INIT_WORK(&card->tx_timeout_task, gelic_net_tx_timeout_task);
init_waitqueue_head(&card->waitq);
atomic_set(&card->tx_timeout_task_counter, 0);
return card;
}
/**
* ps3_gelic_driver_probe - add a device to the control of this driver
*/
static int ps3_gelic_driver_probe (struct ps3_system_bus_device *dev)
{
struct gelic_net_card *card = gelic_net_alloc_card();
int result;
if (!card) {
dev_info(&dev->core, "gelic_net_alloc_card failed\n");
result = -ENOMEM;
goto fail_alloc_card;
}
ps3_system_bus_set_driver_data(dev, card);
card->dev = dev;
result = ps3_open_hv_device(dev);
if (result) {
dev_dbg(&dev->core, "ps3_open_hv_device failed\n");
goto fail_open;
}
result = ps3_dma_region_create(dev->d_region);
if (result) {
dev_dbg(&dev->core, "ps3_dma_region_create failed(%d)\n",
result);
BUG_ON("check region type");
goto fail_dma_region;
}
result = lv1_net_set_interrupt_status_indicator(bus_id(card),
dev_id(card),
ps3_mm_phys_to_lpar(__pa(&card->irq_status)),
0);
if (result) {
dev_dbg(&dev->core,
"lv1_net_set_interrupt_status_indicator failed: %s\n",
ps3_result(result));
result = -EIO;
goto fail_status_indicator;
}
result = gelic_net_setup_netdev(card);
if (result) {
dev_dbg(&dev->core, "%s:%d: ps3_dma_region_create failed: "
"(%d)\n", __func__, __LINE__, result);
goto fail_setup_netdev;
}
return 0;
fail_setup_netdev:
lv1_net_set_interrupt_status_indicator(bus_id(card),
bus_id(card),
0 , 0);
fail_status_indicator:
ps3_dma_region_free(dev->d_region);
fail_dma_region:
ps3_close_hv_device(dev);
fail_open:
ps3_system_bus_set_driver_data(dev, NULL);
free_netdev(card->netdev);
fail_alloc_card:
return result;
}
/**
* ps3_gelic_driver_remove - remove a device from the control of this driver
*/
static int ps3_gelic_driver_remove (struct ps3_system_bus_device *dev)
{
struct gelic_net_card *card = ps3_system_bus_get_driver_data(dev);
wait_event(card->waitq,
atomic_read(&card->tx_timeout_task_counter) == 0);
lv1_net_set_interrupt_status_indicator(bus_id(card), dev_id(card),
0 , 0);
unregister_netdev(card->netdev);
free_netdev(card->netdev);
ps3_system_bus_set_driver_data(dev, NULL);
ps3_dma_region_free(dev->d_region);
ps3_close_hv_device(dev);
return 0;
}
static struct ps3_system_bus_driver ps3_gelic_driver = {
.match_id = PS3_MATCH_ID_GELIC,
.probe = ps3_gelic_driver_probe,
.remove = ps3_gelic_driver_remove,
.shutdown = ps3_gelic_driver_remove,
.core.name = "ps3_gelic_driver",
.core.owner = THIS_MODULE,
};
static int __init ps3_gelic_driver_init (void)
{
return firmware_has_feature(FW_FEATURE_PS3_LV1)
? ps3_system_bus_driver_register(&ps3_gelic_driver)
: -ENODEV;
}
static void __exit ps3_gelic_driver_exit (void)
{
ps3_system_bus_driver_unregister(&ps3_gelic_driver);
}
module_init (ps3_gelic_driver_init);
module_exit (ps3_gelic_driver_exit);
MODULE_ALIAS(PS3_MODULE_ALIAS_GELIC);
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