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add NAPI support to sb1250-mac.c 

Patch to add NAPI support to sb1250-mac.c (rev 2).  This patch differs from
the last in that the NAPI support isn't marked as experimental, nor is it
configurable (ie.  once applied - NAPI is enabled all the time).  This was
based on feedback from Ralf and others.

Signed-off-by: Mark Mason <mason@broadcom.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
This commit is contained in:
Mark Mason 2007-04-26 00:23:22 -07:00 committed by Jeff Garzik
parent 55e924cf57
commit 693aa9470d
1 changed files with 178 additions and 91 deletions
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269
drivers/net/sb1250-mac.c
View File

@ -95,19 +95,28 @@ MODULE_PARM_DESC(full_duplex, "1-" __MODULE_STRING(MAX_UNITS));
#endif
#ifdef CONFIG_SBMAC_COALESCE
static int int_pktcnt = 0;
module_param(int_pktcnt, int, S_IRUGO);
MODULE_PARM_DESC(int_pktcnt, "Packet count");
static int int_pktcnt_tx = 255;
module_param(int_pktcnt_tx, int, S_IRUGO);
MODULE_PARM_DESC(int_pktcnt_tx, "TX packet count");
static int int_timeout = 0;
module_param(int_timeout, int, S_IRUGO);
MODULE_PARM_DESC(int_timeout, "Timeout value");
static int int_timeout_tx = 255;
module_param(int_timeout_tx, int, S_IRUGO);
MODULE_PARM_DESC(int_timeout_tx, "TX timeout value");
static int int_pktcnt_rx = 64;
module_param(int_pktcnt_rx, int, S_IRUGO);
MODULE_PARM_DESC(int_pktcnt_rx, "RX packet count");
static int int_timeout_rx = 64;
module_param(int_timeout_rx, int, S_IRUGO);
MODULE_PARM_DESC(int_timeout_rx, "RX timeout value");
#endif
#include <asm/sibyte/sb1250.h>
#if defined(CONFIG_SIBYTE_BCM1x55) || defined(CONFIG_SIBYTE_BCM1x80)
#include <asm/sibyte/bcm1480_regs.h>
#include <asm/sibyte/bcm1480_int.h>
#define R_MAC_DMA_OODPKTLOST_RX R_MAC_DMA_OODPKTLOST
#elif defined(CONFIG_SIBYTE_SB1250) || defined(CONFIG_SIBYTE_BCM112X)
#include <asm/sibyte/sb1250_regs.h>
#include <asm/sibyte/sb1250_int.h>
@ -155,8 +164,8 @@ typedef enum { sbmac_state_uninit, sbmac_state_off, sbmac_state_on,
#define NUMCACHEBLKS(x) (((x)+SMP_CACHE_BYTES-1)/SMP_CACHE_BYTES)
#define SBMAC_MAX_TXDESCR 32
#define SBMAC_MAX_RXDESCR 32
#define SBMAC_MAX_TXDESCR 256
#define SBMAC_MAX_RXDESCR 256
#define ETHER_ALIGN 2
#define ETHER_ADDR_LEN 6
@ -185,10 +194,10 @@ typedef struct sbmacdma_s {
* associated with it.
*/
struct sbmac_softc *sbdma_eth; /* back pointer to associated MAC */
int sbdma_channel; /* channel number */
struct sbmac_softc *sbdma_eth; /* back pointer to associated MAC */
int sbdma_channel; /* channel number */
int sbdma_txdir; /* direction (1=transmit) */
int sbdma_maxdescr; /* total # of descriptors in ring */
int sbdma_maxdescr; /* total # of descriptors in ring */
#ifdef CONFIG_SBMAC_COALESCE
int sbdma_int_pktcnt; /* # descriptors rx/tx before interrupt*/
int sbdma_int_timeout; /* # usec rx/tx interrupt */
@ -197,13 +206,16 @@ typedef struct sbmacdma_s {
volatile void __iomem *sbdma_config0; /* DMA config register 0 */
volatile void __iomem *sbdma_config1; /* DMA config register 1 */
volatile void __iomem *sbdma_dscrbase; /* Descriptor base address */
volatile void __iomem *sbdma_dscrcnt; /* Descriptor count register */
volatile void __iomem *sbdma_dscrcnt; /* Descriptor count register */
volatile void __iomem *sbdma_curdscr; /* current descriptor address */
volatile void __iomem *sbdma_oodpktlost;/* pkt drop (rx only) */
/*
* This stuff is for maintenance of the ring
*/
sbdmadscr_t *sbdma_dscrtable_unaligned;
sbdmadscr_t *sbdma_dscrtable; /* base of descriptor table */
sbdmadscr_t *sbdma_dscrtable_end; /* end of descriptor table */
@ -286,8 +298,8 @@ static int sbdma_add_rcvbuffer(sbmacdma_t *d,struct sk_buff *m);
static int sbdma_add_txbuffer(sbmacdma_t *d,struct sk_buff *m);
static void sbdma_emptyring(sbmacdma_t *d);
static void sbdma_fillring(sbmacdma_t *d);
static void sbdma_rx_process(struct sbmac_softc *sc,sbmacdma_t *d);
static void sbdma_tx_process(struct sbmac_softc *sc,sbmacdma_t *d);
static int sbdma_rx_process(struct sbmac_softc *sc,sbmacdma_t *d, int work_to_do, int poll);
static void sbdma_tx_process(struct sbmac_softc *sc,sbmacdma_t *d, int poll);
static int sbmac_initctx(struct sbmac_softc *s);
static void sbmac_channel_start(struct sbmac_softc *s);
static void sbmac_channel_stop(struct sbmac_softc *s);
@ -308,6 +320,8 @@ static struct net_device_stats *sbmac_get_stats(struct net_device *dev);
static void sbmac_set_rx_mode(struct net_device *dev);
static int sbmac_mii_ioctl(struct net_device *dev, struct ifreq *rq, int cmd);
static int sbmac_close(struct net_device *dev);
static int sbmac_poll(struct net_device *poll_dev, int *budget);
static int sbmac_mii_poll(struct sbmac_softc *s,int noisy);
static int sbmac_mii_probe(struct net_device *dev);
@ -679,6 +693,10 @@ static void sbdma_initctx(sbmacdma_t *d,
int txrx,
int maxdescr)
{
#ifdef CONFIG_SBMAC_COALESCE
int int_pktcnt, int_timeout;
#endif
/*
* Save away interesting stuff in the structure
*/
@ -728,6 +746,11 @@ static void sbdma_initctx(sbmacdma_t *d,
s->sbm_base + R_MAC_DMA_REGISTER(txrx,chan,R_MAC_DMA_DSCR_CNT);
d->sbdma_curdscr =
s->sbm_base + R_MAC_DMA_REGISTER(txrx,chan,R_MAC_DMA_CUR_DSCRADDR);
if (d->sbdma_txdir)
d->sbdma_oodpktlost = NULL;
else
d->sbdma_oodpktlost =
s->sbm_base + R_MAC_DMA_REGISTER(txrx,chan,R_MAC_DMA_OODPKTLOST_RX);
/*
* Allocate memory for the ring
@ -735,6 +758,7 @@ static void sbdma_initctx(sbmacdma_t *d,
d->sbdma_maxdescr = maxdescr;
d->sbdma_dscrtable_unaligned =
d->sbdma_dscrtable = (sbdmadscr_t *)
kmalloc((d->sbdma_maxdescr+1)*sizeof(sbdmadscr_t), GFP_KERNEL);
@ -765,12 +789,14 @@ static void sbdma_initctx(sbmacdma_t *d,
* Setup Rx/Tx DMA coalescing defaults
*/
int_pktcnt = (txrx == DMA_TX) ? int_pktcnt_tx : int_pktcnt_rx;
if ( int_pktcnt ) {
d->sbdma_int_pktcnt = int_pktcnt;
} else {
d->sbdma_int_pktcnt = 1;
}
int_timeout = (txrx == DMA_TX) ? int_timeout_tx : int_timeout_rx;
if ( int_timeout ) {
d->sbdma_int_timeout = int_timeout;
} else {
@ -1147,30 +1173,41 @@ static void sbmac_netpoll(struct net_device *netdev)
#endif
/**********************************************************************
* SBDMA_RX_PROCESS(sc,d)
* SBDMA_RX_PROCESS(sc,d,work_to_do,poll)
*
* Process "completed" receive buffers on the specified DMA channel.
* Note that this isn't really ideal for priority channels, since
* it processes all of the packets on a given channel before
* returning.
*
* Input parameters:
* sc - softc structure
* d - DMA channel context
* sc - softc structure
* d - DMA channel context
* work_to_do - no. of packets to process before enabling interrupt
* again (for NAPI)
* poll - 1: using polling (for NAPI)
*
* Return value:
* nothing
********************************************************************* */
static void sbdma_rx_process(struct sbmac_softc *sc,sbmacdma_t *d)
static int sbdma_rx_process(struct sbmac_softc *sc,sbmacdma_t *d,
int work_to_do, int poll)
{
int curidx;
int hwidx;
sbdmadscr_t *dsc;
struct sk_buff *sb;
int len;
int work_done = 0;
int dropped = 0;
for (;;) {
prefetch(d);
again:
/* Check if the HW dropped any frames */
sc->sbm_stats.rx_fifo_errors
+= __raw_readq(sc->sbm_rxdma.sbdma_oodpktlost) & 0xffff;
__raw_writeq(0, sc->sbm_rxdma.sbdma_oodpktlost);
while (work_to_do-- > 0) {
/*
* figure out where we are (as an index) and where
* the hardware is (also as an index)
@ -1182,7 +1219,12 @@ static void sbdma_rx_process(struct sbmac_softc *sc,sbmacdma_t *d)
* (sbdma_remptr) and the physical address (sbdma_curdscr CSR)
*/
curidx = d->sbdma_remptr - d->sbdma_dscrtable;
dsc = d->sbdma_remptr;
curidx = dsc - d->sbdma_dscrtable;
prefetch(dsc);
prefetch(&d->sbdma_ctxtable[curidx]);
hwidx = (int) (((__raw_readq(d->sbdma_curdscr) & M_DMA_CURDSCR_ADDR) -
d->sbdma_dscrtable_phys) / sizeof(sbdmadscr_t));
@ -1193,13 +1235,12 @@ static void sbdma_rx_process(struct sbmac_softc *sc,sbmacdma_t *d)
*/
if (curidx == hwidx)
break;
goto done;
/*
* Otherwise, get the packet's sk_buff ptr back
*/
dsc = &(d->sbdma_dscrtable[curidx]);
sb = d->sbdma_ctxtable[curidx];
d->sbdma_ctxtable[curidx] = NULL;
@ -1211,7 +1252,7 @@ static void sbdma_rx_process(struct sbmac_softc *sc,sbmacdma_t *d)
* receive ring.
*/
if (!(dsc->dscr_a & M_DMA_ETHRX_BAD)) {
if (likely (!(dsc->dscr_a & M_DMA_ETHRX_BAD))) {
/*
* Add a new buffer to replace the old one. If we fail
@ -1219,9 +1260,14 @@ static void sbdma_rx_process(struct sbmac_softc *sc,sbmacdma_t *d)
* packet and put it right back on the receive ring.
*/
if (sbdma_add_rcvbuffer(d,NULL) == -ENOBUFS) {
sc->sbm_stats.rx_dropped++;
if (unlikely (sbdma_add_rcvbuffer(d,NULL) ==
-ENOBUFS)) {
sc->sbm_stats.rx_dropped++;
sbdma_add_rcvbuffer(d,sb); /* re-add old buffer */
/* No point in continuing at the moment */
printk(KERN_ERR "dropped packet (1)\n");
d->sbdma_remptr = SBDMA_NEXTBUF(d,sbdma_remptr);
goto done;
} else {
/*
* Set length into the packet
@ -1233,8 +1279,6 @@ static void sbdma_rx_process(struct sbmac_softc *sc,sbmacdma_t *d)
* receive ring. Pass the buffer to
* the kernel
*/
sc->sbm_stats.rx_bytes += len;
sc->sbm_stats.rx_packets++;
sb->protocol = eth_type_trans(sb,d->sbdma_eth->sbm_dev);
/* Check hw IPv4/TCP checksum if supported */
if (sc->rx_hw_checksum == ENABLE) {
@ -1246,8 +1290,22 @@ static void sbdma_rx_process(struct sbmac_softc *sc,sbmacdma_t *d)
sb->ip_summed = CHECKSUM_NONE;
}
}
prefetch(sb->data);
prefetch((const void *)(((char *)sb->data)+32));
if (poll)
dropped = netif_receive_skb(sb);
else
dropped = netif_rx(sb);
netif_rx(sb);
if (dropped == NET_RX_DROP) {
sc->sbm_stats.rx_dropped++;
d->sbdma_remptr = SBDMA_NEXTBUF(d,sbdma_remptr);
goto done;
}
else {
sc->sbm_stats.rx_bytes += len;
sc->sbm_stats.rx_packets++;
}
}
} else {
/*
@ -1264,12 +1322,16 @@ static void sbdma_rx_process(struct sbmac_softc *sc,sbmacdma_t *d)
*/
d->sbdma_remptr = SBDMA_NEXTBUF(d,sbdma_remptr);
work_done++;
}
if (!poll) {
work_to_do = 32;
goto again; /* collect fifo drop statistics again */
}
done:
return work_done;
}
/**********************************************************************
* SBDMA_TX_PROCESS(sc,d)
*
@ -1281,22 +1343,30 @@ static void sbdma_rx_process(struct sbmac_softc *sc,sbmacdma_t *d)
*
* Input parameters:
* sc - softc structure
* d - DMA channel context
* d - DMA channel context
* poll - 1: using polling (for NAPI)
*
* Return value:
* nothing
********************************************************************* */
static void sbdma_tx_process(struct sbmac_softc *sc,sbmacdma_t *d)
static void sbdma_tx_process(struct sbmac_softc *sc,sbmacdma_t *d, int poll)
{
int curidx;
int hwidx;
sbdmadscr_t *dsc;
struct sk_buff *sb;
unsigned long flags;
int packets_handled = 0;
spin_lock_irqsave(&(sc->sbm_lock), flags);
if (d->sbdma_remptr == d->sbdma_addptr)
goto end_unlock;
hwidx = (int) (((__raw_readq(d->sbdma_curdscr) & M_DMA_CURDSCR_ADDR) -
d->sbdma_dscrtable_phys) / sizeof(sbdmadscr_t));
for (;;) {
/*
* figure out where we are (as an index) and where
@ -1310,8 +1380,6 @@ static void sbdma_tx_process(struct sbmac_softc *sc,sbmacdma_t *d)
*/
curidx = d->sbdma_remptr - d->sbdma_dscrtable;
hwidx = (int) (((__raw_readq(d->sbdma_curdscr) & M_DMA_CURDSCR_ADDR) -
d->sbdma_dscrtable_phys) / sizeof(sbdmadscr_t));
/*
* If they're the same, that means we've processed all
@ -1349,6 +1417,8 @@ static void sbdma_tx_process(struct sbmac_softc *sc,sbmacdma_t *d)
d->sbdma_remptr = SBDMA_NEXTBUF(d,sbdma_remptr);
packets_handled++;
}
/*
@ -1357,8 +1427,10 @@ static void sbdma_tx_process(struct sbmac_softc *sc,sbmacdma_t *d)
* watermark on the transmit queue.
*/
netif_wake_queue(d->sbdma_eth->sbm_dev);
if (packets_handled)
netif_wake_queue(d->sbdma_eth->sbm_dev);
end_unlock:
spin_unlock_irqrestore(&(sc->sbm_lock), flags);
}
@ -1432,9 +1504,9 @@ static int sbmac_initctx(struct sbmac_softc *s)
static void sbdma_uninitctx(struct sbmacdma_s *d)
{
if (d->sbdma_dscrtable) {
kfree(d->sbdma_dscrtable);
d->sbdma_dscrtable = NULL;
if (d->sbdma_dscrtable_unaligned) {
kfree(d->sbdma_dscrtable_unaligned);
d->sbdma_dscrtable_unaligned = d->sbdma_dscrtable = NULL;
}
if (d->sbdma_ctxtable) {
@ -1632,15 +1704,9 @@ static void sbmac_channel_start(struct sbmac_softc *s)
#endif
#ifdef CONFIG_SBMAC_COALESCE
/*
* Accept any TX interrupt and EOP count/timer RX interrupts on ch 0
*/
__raw_writeq(((M_MAC_INT_EOP_COUNT | M_MAC_INT_EOP_TIMER) << S_MAC_TX_CH0) |
((M_MAC_INT_EOP_COUNT | M_MAC_INT_EOP_TIMER) << S_MAC_RX_CH0), s->sbm_imr);
#else
/*
* Accept any kind of interrupt on TX and RX DMA channel 0
*/
__raw_writeq((M_MAC_INT_CHANNEL << S_MAC_TX_CH0) |
(M_MAC_INT_CHANNEL << S_MAC_RX_CH0), s->sbm_imr);
#endif
@ -2073,57 +2139,46 @@ static irqreturn_t sbmac_intr(int irq,void *dev_instance)
uint64_t isr;
int handled = 0;
for (;;) {
/*
* Read the ISR (this clears the bits in the real
* register, except for counter addr)
*/
/*
* Read the ISR (this clears the bits in the real
* register, except for counter addr)
*/
isr = __raw_readq(sc->sbm_isr) & ~M_MAC_COUNTER_ADDR;
isr = __raw_readq(sc->sbm_isr) & ~M_MAC_COUNTER_ADDR;
if (isr == 0)
return IRQ_RETVAL(0);
handled = 1;
if (isr == 0)
break;
/*
* Transmits on channel 0
*/
handled = 1;
/*
* Transmits on channel 0
*/
if (isr & (M_MAC_INT_CHANNEL << S_MAC_TX_CH0)) {
sbdma_tx_process(sc,&(sc->sbm_txdma));
if (isr & (M_MAC_INT_CHANNEL << S_MAC_TX_CH0)) {
sbdma_tx_process(sc,&(sc->sbm_txdma), 0);
#ifdef CONFIG_NETPOLL_TRAP
if (netpoll_trap()) {
if (test_and_clear_bit(__LINK_STATE_XOFF, &dev->state))
__netif_schedule(dev);
}
#endif
}
/*
* Receives on channel 0
*/
/*
* It's important to test all the bits (or at least the
* EOP_SEEN bit) when deciding to do the RX process
* particularly when coalescing, to make sure we
* take care of the following:
*
* If you have some packets waiting (have been received
* but no interrupt) and get a TX interrupt before
* the RX timer or counter expires, reading the ISR
* above will clear the timer and counter, and you
* won't get another interrupt until a packet shows
* up to start the timer again. Testing
* EOP_SEEN here takes care of this case.
* (EOP_SEEN is part of M_MAC_INT_CHANNEL << S_MAC_RX_CH0)
*/
if (isr & (M_MAC_INT_CHANNEL << S_MAC_RX_CH0)) {
sbdma_rx_process(sc,&(sc->sbm_rxdma));
if (isr & (M_MAC_INT_CHANNEL << S_MAC_RX_CH0)) {
if (netif_rx_schedule_prep(dev)) {
__raw_writeq(0, sc->sbm_imr);
__netif_rx_schedule(dev);
/* Depend on the exit from poll to reenable intr */
}
else {
/* may leave some packets behind */
sbdma_rx_process(sc,&(sc->sbm_rxdma),
SBMAC_MAX_RXDESCR * 2, 0);
}
}
return IRQ_RETVAL(handled);
}
/**********************************************************************
* SBMAC_START_TX(skb,dev)
*
@ -2253,8 +2308,6 @@ static void sbmac_setmulti(struct sbmac_softc *sc)
}
}
#if defined(SBMAC_ETH0_HWADDR) || defined(SBMAC_ETH1_HWADDR) || defined(SBMAC_ETH2_HWADDR) || defined(SBMAC_ETH3_HWADDR)
/**********************************************************************
* SBMAC_PARSE_XDIGIT(str)
@ -2417,6 +2470,8 @@ static int sbmac_init(struct net_device *dev, int idx)
dev->do_ioctl = sbmac_mii_ioctl;
dev->tx_timeout = sbmac_tx_timeout;
dev->watchdog_timeo = TX_TIMEOUT;
dev->poll = sbmac_poll;
dev->weight = 16;
dev->change_mtu = sb1250_change_mtu;
#ifdef CONFIG_NET_POLL_CONTROLLER
@ -2819,7 +2874,39 @@ static int sbmac_close(struct net_device *dev)
return 0;
}
static int sbmac_poll(struct net_device *dev, int *budget)
{
int work_to_do;
int work_done;
struct sbmac_softc *sc = netdev_priv(dev);
work_to_do = min(*budget, dev->quota);
work_done = sbdma_rx_process(sc, &(sc->sbm_rxdma), work_to_do, 1);
if (work_done > work_to_do)
printk(KERN_ERR "%s exceeded work_to_do budget=%d quota=%d work-done=%d\n",
sc->sbm_dev->name, *budget, dev->quota, work_done);
sbdma_tx_process(sc, &(sc->sbm_txdma), 1);
*budget -= work_done;
dev->quota -= work_done;
if (work_done < work_to_do) {
netif_rx_complete(dev);
#ifdef CONFIG_SBMAC_COALESCE
__raw_writeq(((M_MAC_INT_EOP_COUNT | M_MAC_INT_EOP_TIMER) << S_MAC_TX_CH0) |
((M_MAC_INT_EOP_COUNT | M_MAC_INT_EOP_TIMER) << S_MAC_RX_CH0),
sc->sbm_imr);
#else
__raw_writeq((M_MAC_INT_CHANNEL << S_MAC_TX_CH0) |
(M_MAC_INT_CHANNEL << S_MAC_RX_CH0), sc->sbm_imr);
#endif
}
return (work_done >= work_to_do);
}
#if defined(SBMAC_ETH0_HWADDR) || defined(SBMAC_ETH1_HWADDR) || defined(SBMAC_ETH2_HWADDR) || defined(SBMAC_ETH3_HWADDR)
static void
@ -2906,7 +2993,7 @@ sbmac_init_module(void)
/*
* The R_MAC_ETHERNET_ADDR register will be set to some nonzero
* value for us by the firmware if we're going to use this MAC.
* value for us by the firmware if we are going to use this MAC.
* If we find a zero, skip this MAC.
*/