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linux/drivers/net/ps3_gelic_net.h
Geoff Levand ecae42d370 net/ps3: Fix gelic RX DMA restart 
Fix the condition where PS3 network RX hangs when no network
TX is occurring by calling gelic_card_enable_rxdmac() during
RX_DMA_CHAIN_END event processing.

The gelic hardware automatically clears its RX_DMA_EN flag when
it detects an RX_DMA_CHAIN_END event.  In its processing of
RX_DMA_CHAIN_END the gelic driver is required to set RX_DMA_EN
(with a call to gelic_card_enable_rxdmac()) to restart RX DMA
transfers.  The existing gelic driver code does not set
RX_DMA_EN directly in its processing of the RX_DMA_CHAIN_END
event, but uses a flag variable card->rx_dma_restart_required
to schedule the setting of RX_DMA_EN until next inside the
interrupt handler.

It seems this delayed setting of RX_DMA_EN causes the hang since
the next RX interrupt after the RX_DMA_CHAIN_END event where
RX_DMA_EN is scheduled to be set will not occur since RX_DMA_EN
was not set.  In the case were network TX is occuring, RX_DMA_EN
is set in the next TX interrupt and RX processing continues.

Signed-off-by: Geoff Levand <geoff@infradead.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
2011-07-14 16:03:29 -07:00

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/*
* PS3 Platfom gelic network driver.
*
* Copyright (C) 2007 Sony Computer Entertainment Inc.
* Copyright 2006, 2007 Sony Corporation.
*
* This file is based on: spider_net.h
*
* (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.
*/
#ifndef _GELIC_NET_H
#define _GELIC_NET_H
/* descriptors */
#define GELIC_NET_RX_DESCRIPTORS 128 /* num of descriptors */
#define GELIC_NET_TX_DESCRIPTORS 128 /* num of descriptors */
#define GELIC_NET_MAX_MTU VLAN_ETH_FRAME_LEN
#define GELIC_NET_MIN_MTU VLAN_ETH_ZLEN
#define GELIC_NET_RXBUF_ALIGN 128
#define GELIC_CARD_RX_CSUM_DEFAULT 1 /* hw chksum */
#define GELIC_NET_WATCHDOG_TIMEOUT 5*HZ
#define GELIC_NET_NAPI_WEIGHT (GELIC_NET_RX_DESCRIPTORS)
#define GELIC_NET_BROADCAST_ADDR 0xffffffffffffL
#define GELIC_NET_MC_COUNT_MAX 32 /* multicast address list */
/* virtual interrupt status register bits */
/* INT1 */
#define GELIC_CARD_TX_RAM_FULL_ERR 0x0000000000000001L
#define GELIC_CARD_RX_RAM_FULL_ERR 0x0000000000000002L
#define GELIC_CARD_TX_SHORT_FRAME_ERR 0x0000000000000004L
#define GELIC_CARD_TX_INVALID_DESCR_ERR 0x0000000000000008L
#define GELIC_CARD_RX_FIFO_FULL_ERR 0x0000000000002000L
#define GELIC_CARD_RX_DESCR_CHAIN_END 0x0000000000004000L
#define GELIC_CARD_RX_INVALID_DESCR_ERR 0x0000000000008000L
#define GELIC_CARD_TX_RESPONCE_ERR 0x0000000000010000L
#define GELIC_CARD_RX_RESPONCE_ERR 0x0000000000100000L
#define GELIC_CARD_TX_PROTECTION_ERR 0x0000000000400000L
#define GELIC_CARD_RX_PROTECTION_ERR 0x0000000004000000L
#define GELIC_CARD_TX_TCP_UDP_CHECKSUM_ERR 0x0000000008000000L
#define GELIC_CARD_PORT_STATUS_CHANGED 0x0000000020000000L
#define GELIC_CARD_WLAN_EVENT_RECEIVED 0x0000000040000000L
#define GELIC_CARD_WLAN_COMMAND_COMPLETED 0x0000000080000000L
/* INT 0 */
#define GELIC_CARD_TX_FLAGGED_DESCR 0x0004000000000000L
#define GELIC_CARD_RX_FLAGGED_DESCR 0x0040000000000000L
#define GELIC_CARD_TX_TRANSFER_END 0x0080000000000000L
#define GELIC_CARD_TX_DESCR_CHAIN_END 0x0100000000000000L
#define GELIC_CARD_NUMBER_OF_RX_FRAME 0x1000000000000000L
#define GELIC_CARD_ONE_TIME_COUNT_TIMER 0x4000000000000000L
#define GELIC_CARD_FREE_RUN_COUNT_TIMER 0x8000000000000000L
/* initial interrupt mask */
#define GELIC_CARD_TXINT GELIC_CARD_TX_DESCR_CHAIN_END
#define GELIC_CARD_RXINT (GELIC_CARD_RX_DESCR_CHAIN_END | \
GELIC_CARD_NUMBER_OF_RX_FRAME)
/* RX descriptor data_status bits */
enum gelic_descr_rx_status {
GELIC_DESCR_RXDMADU = 0x80000000, /* destination MAC addr unknown */
GELIC_DESCR_RXLSTFBF = 0x40000000, /* last frame buffer */
GELIC_DESCR_RXIPCHK = 0x20000000, /* IP checksum performed */
GELIC_DESCR_RXTCPCHK = 0x10000000, /* TCP/UDP checksup performed */
GELIC_DESCR_RXWTPKT = 0x00C00000, /*
* wakeup trigger packet
* 01: Magic Packet (TM)
* 10: ARP packet
* 11: Multicast MAC addr
*/
GELIC_DESCR_RXVLNPKT = 0x00200000, /* VLAN packet */
/* bit 20..16 reserved */
GELIC_DESCR_RXRRECNUM = 0x0000ff00, /* reception receipt number */
/* bit 7..0 reserved */
};
#define GELIC_DESCR_DATA_STATUS_CHK_MASK \
(GELIC_DESCR_RXIPCHK | GELIC_DESCR_RXTCPCHK)
/* TX descriptor data_status bits */
enum gelic_descr_tx_status {
GELIC_DESCR_TX_TAIL = 0x00000001, /* gelic treated this
* descriptor was end of
* a tx frame
*/
};
/* RX descriptor data error bits */
enum gelic_descr_rx_error {
/* bit 31 reserved */
GELIC_DESCR_RXALNERR = 0x40000000, /* alignement error 10/100M */
GELIC_DESCR_RXOVERERR = 0x20000000, /* oversize error */
GELIC_DESCR_RXRNTERR = 0x10000000, /* Runt error */
GELIC_DESCR_RXIPCHKERR = 0x08000000, /* IP checksum error */
GELIC_DESCR_RXTCPCHKERR = 0x04000000, /* TCP/UDP checksum error */
GELIC_DESCR_RXDRPPKT = 0x00100000, /* drop packet */
GELIC_DESCR_RXIPFMTERR = 0x00080000, /* IP packet format error */
/* bit 18 reserved */
GELIC_DESCR_RXDATAERR = 0x00020000, /* IP packet format error */
GELIC_DESCR_RXCALERR = 0x00010000, /* cariier extension length
* error */
GELIC_DESCR_RXCREXERR = 0x00008000, /* carrier extension error */
GELIC_DESCR_RXMLTCST = 0x00004000, /* multicast address frame */
/* bit 13..0 reserved */
};
#define GELIC_DESCR_DATA_ERROR_CHK_MASK \
(GELIC_DESCR_RXIPCHKERR | GELIC_DESCR_RXTCPCHKERR)
/* DMA command and status (RX and TX)*/
enum gelic_descr_dma_status {
GELIC_DESCR_DMA_COMPLETE = 0x00000000, /* used in tx */
GELIC_DESCR_DMA_BUFFER_FULL = 0x00000000, /* used in rx */
GELIC_DESCR_DMA_RESPONSE_ERROR = 0x10000000, /* used in rx, tx */
GELIC_DESCR_DMA_PROTECTION_ERROR = 0x20000000, /* used in rx, tx */
GELIC_DESCR_DMA_FRAME_END = 0x40000000, /* used in rx */
GELIC_DESCR_DMA_FORCE_END = 0x50000000, /* used in rx, tx */
GELIC_DESCR_DMA_CARDOWNED = 0xa0000000, /* used in rx, tx */
GELIC_DESCR_DMA_NOT_IN_USE = 0xb0000000, /* any other value */
};
#define GELIC_DESCR_DMA_STAT_MASK (0xf0000000)
/* tx descriptor command and status */
enum gelic_descr_tx_dma_status {
/* [19] */
GELIC_DESCR_TX_DMA_IKE = 0x00080000, /* IPSEC off */
/* [18] */
GELIC_DESCR_TX_DMA_FRAME_TAIL = 0x00040000, /* last descriptor of
* the packet
*/
/* [17..16] */
GELIC_DESCR_TX_DMA_TCP_CHKSUM = 0x00020000, /* TCP packet */
GELIC_DESCR_TX_DMA_UDP_CHKSUM = 0x00030000, /* UDP packet */
GELIC_DESCR_TX_DMA_NO_CHKSUM = 0x00000000, /* no checksum */
/* [1] */
GELIC_DESCR_TX_DMA_CHAIN_END = 0x00000002, /* DMA terminated
* due to chain end
*/
};
#define GELIC_DESCR_DMA_CMD_NO_CHKSUM \
(GELIC_DESCR_DMA_CARDOWNED | GELIC_DESCR_TX_DMA_IKE | \
GELIC_DESCR_TX_DMA_NO_CHKSUM)
#define GELIC_DESCR_DMA_CMD_TCP_CHKSUM \
(GELIC_DESCR_DMA_CARDOWNED | GELIC_DESCR_TX_DMA_IKE | \
GELIC_DESCR_TX_DMA_TCP_CHKSUM)
#define GELIC_DESCR_DMA_CMD_UDP_CHKSUM \
(GELIC_DESCR_DMA_CARDOWNED | GELIC_DESCR_TX_DMA_IKE | \
GELIC_DESCR_TX_DMA_UDP_CHKSUM)
enum gelic_descr_rx_dma_status {
/* [ 1 ] */
GELIC_DESCR_RX_DMA_CHAIN_END = 0x00000002, /* DMA terminated
* due to chain end
*/
};
/* for lv1_net_control */
enum gelic_lv1_net_control_code {
GELIC_LV1_GET_MAC_ADDRESS = 1,
GELIC_LV1_GET_ETH_PORT_STATUS = 2,
GELIC_LV1_SET_NEGOTIATION_MODE = 3,
GELIC_LV1_GET_VLAN_ID = 4,
GELIC_LV1_SET_WOL = 5,
GELIC_LV1_GET_CHANNEL = 6,
GELIC_LV1_POST_WLAN_CMD = 9,
GELIC_LV1_GET_WLAN_CMD_RESULT = 10,
GELIC_LV1_GET_WLAN_EVENT = 11,
};
/* for GELIC_LV1_SET_WOL */
enum gelic_lv1_wol_command {
GELIC_LV1_WOL_MAGIC_PACKET = 1,
GELIC_LV1_WOL_ADD_MATCH_ADDR = 6,
GELIC_LV1_WOL_DELETE_MATCH_ADDR = 7,
};
/* for GELIC_LV1_WOL_MAGIC_PACKET */
enum gelic_lv1_wol_mp_arg {
GELIC_LV1_WOL_MP_DISABLE = 0,
GELIC_LV1_WOL_MP_ENABLE = 1,
};
/* for GELIC_LV1_WOL_{ADD,DELETE}_MATCH_ADDR */
enum gelic_lv1_wol_match_arg {
GELIC_LV1_WOL_MATCH_INDIVIDUAL = 0,
GELIC_LV1_WOL_MATCH_ALL = 1,
};
/* status returened from GET_ETH_PORT_STATUS */
enum gelic_lv1_ether_port_status {
GELIC_LV1_ETHER_LINK_UP = 0x0000000000000001L,
GELIC_LV1_ETHER_FULL_DUPLEX = 0x0000000000000002L,
GELIC_LV1_ETHER_AUTO_NEG = 0x0000000000000004L,
GELIC_LV1_ETHER_SPEED_10 = 0x0000000000000010L,
GELIC_LV1_ETHER_SPEED_100 = 0x0000000000000020L,
GELIC_LV1_ETHER_SPEED_1000 = 0x0000000000000040L,
GELIC_LV1_ETHER_SPEED_MASK = 0x0000000000000070L,
};
enum gelic_lv1_vlan_index {
/* for outgoing packets */
GELIC_LV1_VLAN_TX_ETHERNET_0 = 0x0000000000000002L,
GELIC_LV1_VLAN_TX_WIRELESS = 0x0000000000000003L,
/* for incoming packets */
GELIC_LV1_VLAN_RX_ETHERNET_0 = 0x0000000000000012L,
GELIC_LV1_VLAN_RX_WIRELESS = 0x0000000000000013L,
};
enum gelic_lv1_phy {
GELIC_LV1_PHY_ETHERNET_0 = 0x0000000000000002L,
};
/* size of hardware part of gelic descriptor */
#define GELIC_DESCR_SIZE (32)
enum gelic_port_type {
GELIC_PORT_ETHERNET_0 = 0,
GELIC_PORT_WIRELESS = 1,
GELIC_PORT_MAX
};
struct gelic_descr {
/* as defined by the hardware */
__be32 buf_addr;
__be32 buf_size;
__be32 next_descr_addr;
__be32 dmac_cmd_status;
__be32 result_size;
__be32 valid_size; /* all zeroes for tx */
__be32 data_status;
__be32 data_error; /* all zeroes for tx */
/* used in the driver */
struct sk_buff *skb;
dma_addr_t bus_addr;
struct gelic_descr *next;
struct gelic_descr *prev;
} __attribute__((aligned(32)));
struct gelic_descr_chain {
/* we walk from tail to head */
struct gelic_descr *head;
struct gelic_descr *tail;
};
struct gelic_vlan_id {
u16 tx;
u16 rx;
};
struct gelic_card {
struct napi_struct napi;
struct net_device *netdev[GELIC_PORT_MAX];
/*
* hypervisor requires irq_status should be
* 8 bytes aligned, but u64 member is
* always disposed in that manner
*/
u64 irq_status;
u64 irq_mask;
struct ps3_system_bus_device *dev;
struct gelic_vlan_id vlan[GELIC_PORT_MAX];
int vlan_required;
struct gelic_descr_chain tx_chain;
struct gelic_descr_chain rx_chain;
/*
* tx_lock guards tx descriptor list and
* tx_dma_progress.
*/
spinlock_t tx_lock;
int tx_dma_progress;
struct work_struct tx_timeout_task;
atomic_t tx_timeout_task_counter;
wait_queue_head_t waitq;
/* only first user should up the card */
struct mutex updown_lock;
atomic_t users;
u64 ether_port_status;
int link_mode;
/* original address returned by kzalloc */
void *unalign;
/*
* each netdevice has copy of irq
*/
unsigned int irq;
struct gelic_descr *tx_top, *rx_top;
struct gelic_descr descr[0]; /* must be the last */
};
struct gelic_port {
struct gelic_card *card;
struct net_device *netdev;
enum gelic_port_type type;
long priv[0]; /* long for alignment */
};
static inline struct gelic_card *port_to_card(struct gelic_port *p)
{
return p->card;
}
static inline struct net_device *port_to_netdev(struct gelic_port *p)
{
return p->netdev;
}
static inline struct gelic_card *netdev_card(struct net_device *d)
{
return ((struct gelic_port *)netdev_priv(d))->card;
}
static inline struct gelic_port *netdev_port(struct net_device *d)
{
return (struct gelic_port *)netdev_priv(d);
}
static inline struct device *ctodev(struct gelic_card *card)
{
return &card->dev->core;
}
static inline u64 bus_id(struct gelic_card *card)
{
return card->dev->bus_id;
}
static inline u64 dev_id(struct gelic_card *card)
{
return card->dev->dev_id;
}
static inline void *port_priv(struct gelic_port *port)
{
return port->priv;
}
extern int gelic_card_set_irq_mask(struct gelic_card *card, u64 mask);
/* shared netdev ops */
extern void gelic_card_up(struct gelic_card *card);
extern void gelic_card_down(struct gelic_card *card);
extern int gelic_net_open(struct net_device *netdev);
extern int gelic_net_stop(struct net_device *netdev);
extern int gelic_net_xmit(struct sk_buff *skb, struct net_device *netdev);
extern void gelic_net_set_multi(struct net_device *netdev);
extern void gelic_net_tx_timeout(struct net_device *netdev);
extern int gelic_net_change_mtu(struct net_device *netdev, int new_mtu);
extern int gelic_net_setup_netdev(struct net_device *netdev,
struct gelic_card *card);
/* shared ethtool ops */
extern void gelic_net_get_drvinfo(struct net_device *netdev,
struct ethtool_drvinfo *info);
extern void gelic_net_poll_controller(struct net_device *netdev);
#endif /* _GELIC_NET_H */
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