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spidernet: enhance the dump routine 

Crazy device problems are hard to debug, when one does not have
good trace info. This patch makes a major enhancement to the
device dump routine.

Signed-off-by: Linas Vepstas <linas@austin.ibm.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
This commit is contained in:
Linas Vepstas 2007-06-11 13:48:55 -05:00 committed by Jeff Garzik
parent e6311d855e
commit 9948357d49
1 changed files with 70 additions and 8 deletions
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78
drivers/net/spider_net.c
View File

@ -1022,34 +1022,94 @@ spider_net_pass_skb_up(struct spider_net_descr *descr,
netif_receive_skb(skb);
}
#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;
struct spider_net_hw_descr *hwd = start->hwdescr;
struct device *dev = &card->netdev->dev;
u32 curr_desc, next_desc;
int status;
int tot = 0;
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);
int off = start - chain->ring;
int cstat = hwd->dmac_cmd_status;
dev_info(dev, "Total number of descrs=%d\n",
chain->num_desc);
dev_info(dev, "Chain tail located at descr=%d, status=0x%x\n",
off, cstat);
curr_desc = spider_net_read_reg(card, SPIDER_NET_GDACTDPA);
next_desc = spider_net_read_reg(card, SPIDER_NET_GDACNEXTDA);
status = cstat;
do
{
status = spider_net_get_descr_status(descr);
hwd = descr->hwdescr;
off = descr - chain->ring;
status = hwd->dmac_cmd_status;
if (descr == chain->head)
dev_info(dev, "Chain head is at %d, head status=0x%x\n",
off, status);
if (curr_desc == descr->bus_addr)
dev_info(dev, "HW curr desc (GDACTDPA) is at %d, status=0x%x\n",
off, status);
if (next_desc == descr->bus_addr)
dev_info(dev, "HW next desc (GDACNEXTDA) is at %d, status=0x%x\n",
off, status);
if (hwd->next_descr_addr == 0)
dev_info(dev, "chain is cut at %d\n", off);
if (cstat != status) {
printk(KERN_INFO "Have %d descrs with stat=x%08x\n", cnt, cstat);
int from = (chain->num_desc + off - cnt) % chain->num_desc;
int to = (chain->num_desc + off - 1) % chain->num_desc;
dev_info(dev, "Have %d (from %d to %d) descrs "
"with stat=0x%08x\n", cnt, from, to, cstat);
cstat = status;
cnt = 0;
}
cnt ++;
tot ++;
descr = descr->next;
} while (descr != start);
dev_info(dev, "Last %d descrs with stat=0x%08x "
"for a total of %d descrs\n", cnt, cstat, tot);
#ifdef DEBUG
/* Now dump the whole ring */
descr = start;
do
{
struct spider_net_hw_descr *hwd = descr->hwdescr;
status = spider_net_get_descr_status(hwd);
cnt = descr - chain->ring;
dev_info(dev, "Descr %d stat=0x%08x skb=%p\n",
cnt, status, descr->skb);
dev_info(dev, "bus addr=%08x buf addr=%08x sz=%d\n",
descr->bus_addr, hwd->buf_addr, hwd->buf_size);
dev_info(dev, "next=%08x result sz=%d valid sz=%d\n",
hwd->next_descr_addr, hwd->result_size,
hwd->valid_size);
dev_info(dev, "dmac=%08x data stat=%08x data err=%08x\n",
hwd->dmac_cmd_status, hwd->data_status,
hwd->data_error);
dev_info(dev, "\n");
descr = descr->next;
} while (descr != start);
printk(KERN_INFO "Last %d descrs with stat=x%08x\n", cnt, cstat);
}
#endif
}
/**
* spider_net_resync_head_ptr - Advance head ptr past empty descrs
*
@ -1195,6 +1255,8 @@ spider_net_decode_one_descr(struct spider_net_card *card)
return 1;
bad_desc:
if (netif_msg_rx_err(card))
show_rx_chain(card);
dev_kfree_skb_irq(descr->skb);
descr->skb = NULL;
hwdescr->dmac_cmd_status = SPIDER_NET_DESCR_NOT_IN_USE;