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More agressive speed optimalisation of cs8900_input(), reading 4 words per input loop iteration.

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This commit is contained in:
christiaans 2006-03-29 12:12:13 +00:00
parent 8bb26656a1
commit ba840c6756
2 changed files with 33 additions and 10 deletions
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3
ports/c16x/include/netif/cs8900if.h
View File

@ -53,6 +53,9 @@
*/
#define CS8900_STATS 2
/* Number of ISQ events that may be serviced by cs8900_service() (at least 1) */
#define CS8900_EVTS2SRV 10
struct cs8900if
{
//struct eth_addr *ethaddr;

40
ports/c16x/netif/cs8900if.c
View File

@ -415,14 +415,19 @@ static err_t cs8900_output(struct netif *netif, struct pbuf *p)
*/
static struct pbuf *cs8900_input(struct netif *netif)
{
volatile u16_t* rxtx_reg;
volatile u16_t rxtx_num = (MEM_BASE + IO_BASE);
u16_t* ptr = NULL;
struct pbuf *p = NULL, *q = NULL;
u16_t len = 0;
u16_t event_type;
u16_t i;
u16_t *ptr = NULL;
/* optimized register mapping for Tasking c166 7.5 (default optimalisation setting)
Using RXTXREG drictly produces inefficient code with many const address loads. */
rxtx_reg = ((volatile u16_t *)(rxtx_num));
// read RxStatus
event_type = RXTXREG;
event_type = *rxtx_reg;
// correctly received frame, either broadcast or individual address?
// TODO: maybe defer these conditions to cs8900_input()
@ -441,7 +446,7 @@ static struct pbuf *cs8900_input(struct netif *netif)
#endif
event_type = 0;
// read RxLength
len = RXTXREG;
len = *rxtx_reg;
LWIP_DEBUGF(NETIF_DEBUG, ("cs8900_input: packet len %"U16_F"\n", len));
snmp_add_ifinoctets(len);
// positive length?
@ -455,16 +460,32 @@ static struct pbuf *cs8900_input(struct netif *netif)
/* drop the padding word */
pbuf_header(p, -ETH_PAD_SIZE); /* drop the padding word */
#endif
for (q = p; q != 0; q = q->next)
{
LWIP_DEBUGF(NETIF_DEBUG, ("cs8900_input: pbuf @%p tot_len %"U16_F" len %"U16_F"\n", q, q->tot_len, q->len));
ptr = q->payload;
// TODO: CHECK: what if q->len is odd? we don't use the last byte?
for (i = (q->len + 1) / 2; i > 0; i--)
/* read 8 bytes per iteration */
ptr = q->payload;
i = q->len / 8;
while(i > 0)
{
*ptr = RXTXREG;
*ptr = *rxtx_reg;
ptr++;
*ptr = *rxtx_reg;
ptr++;
*ptr = *rxtx_reg;
ptr++;
*ptr = *rxtx_reg;
ptr++;
i--;
}
/* read remainder */
i = ((q->len % 8) + 1) / 2;
while(i > 0)
{
*ptr = *rxtx_reg;
ptr++;
i--;
}
}
#if ETH_PAD_SIZE
@ -510,8 +531,7 @@ static struct pbuf *cs8900_input(struct netif *netif)
static void cs8900_service(struct netif *netif)
{
/* amount of ISQ's to handle (> 0) in one cs8900_service() call */
u8_t events2service = 1;
u8_t events2service = CS8900_EVTS2SRV;
#if (CS8900_STATS > 0)
u16_t miss_count = 0, coll_count = 0;
#endif