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Spidernet RX Debugging printout 

Add some debugging and error printing.

The show_rx_chain() prints out the status of the rx chain,
which shows that the status of the descriptors gets
messed up after the second & subsequent RX ramfulls.

Print out contents of bad packets if error occurs.

Signed-off-by: Linas Vepstas <linas@austin.ibm.com>
Cc: James K Lewis <jklewis@us.ibm.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
This commit is contained in:
Linas Vepstas 2006-12-13 15:23:56 -06:00 committed by Jeff Garzik
parent df519ab2c5
commit 6d24998f07
1 changed files with 46 additions and 0 deletions
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46
drivers/net/spider_net.c
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@ -961,6 +961,34 @@ spider_net_pass_skb_up(struct spider_net_descr *descr,
card->netdev_stats.rx_bytes += skb->len;
}
#ifdef DEBUG
static void show_rx_chain(struct spider_net_card *card)
{
struct spider_net_descr_chain *chain = &card->rx_chain;
struct spider_net_descr *start= chain->tail;
struct spider_net_descr *descr= start;
int status;
int cnt = 0;
int cstat = spider_net_get_descr_status(descr);
printk(KERN_INFO "RX chain tail at descr=%ld\n",
(start - card->descr) - card->tx_chain.num_desc);
status = cstat;
do
{
status = spider_net_get_descr_status(descr);
if (cstat != status) {
printk(KERN_INFO "Have %d descrs with stat=x%08x\n", cnt, cstat);
cstat = status;
cnt = 0;
}
cnt ++;
descr = descr->next;
} while (descr != start);
printk(KERN_INFO "Last %d descrs with stat=x%08x\n", cnt, cstat);
}
#endif
/**
* spider_net_decode_one_descr - processes an rx descriptor
* @card: card structure
@ -1021,6 +1049,24 @@ spider_net_decode_one_descr(struct spider_net_card *card)
goto bad_desc;
}
if (descr->dmac_cmd_status & 0xfefe) {
pr_err("%s: bad status, cmd_status=x%08x\n",
card->netdev->name,
descr->dmac_cmd_status);
pr_err("buf_addr=x%08x\n", descr->buf_addr);
pr_err("buf_size=x%08x\n", descr->buf_size);
pr_err("next_descr_addr=x%08x\n", descr->next_descr_addr);
pr_err("result_size=x%08x\n", descr->result_size);
pr_err("valid_size=x%08x\n", descr->valid_size);
pr_err("data_status=x%08x\n", descr->data_status);
pr_err("data_error=x%08x\n", descr->data_error);
pr_err("bus_addr=x%08x\n", descr->bus_addr);
pr_err("which=%ld\n", descr - card->rx_chain.ring);
card->spider_stats.rx_desc_error++;
goto bad_desc;
}
/* Ok, we've got a packet in descr */
spider_net_pass_skb_up(descr, card);
descr->dmac_cmd_status = SPIDER_NET_DESCR_NOT_IN_USE;