Hi Guys
I am using the Lwip Stack with ecos and get following problem when i make a
Broadcast storm on my device.
In the eth_drv.c the eth_drv_recv() function it is not possible to allocate
any pbuf anymore and my ethernet device does not react anymore.
I see that i get receive interrupts but can't process it because the
ownership bits of my buffer queue pointer addresses are not getting reseted
which would be done in the (sc->funs->recv) (sc, sg_list, sg_len); recv()
function of my driver. But due to the failed pbuf_alloc my drivers recv()
function is not called anymore the function returns with nothing.
static void
eth_drv_recv(struct eth_drv_sc *sc, int total_len)
{
struct eth_drv_sg sg_list[MAX_ETH_DRV_SG];
struct netif *netif = &sc->sc_arpcom.ac_if;
struct pbuf *p, *q;
int sg_len = 0;
CYGARC_HAL_SAVE_GP();
if ((total_len > MAX_ETH_MSG) || (total_len < 0)) {
total_len = MAX_ETH_MSG;
}
p = pbuf_alloc(PBUF_RAW, total_len, PBUF_POOL);
if (p == NULL) {
LWIP_DEBUGF(0, ("ecosif_input: low_level_input returned NULL\n"));
return;
}
for (q = p; q != NULL; q = q->next) {
sg_list[sg_len].buf = (CYG_ADDRESS) q->payload;
sg_list[sg_len++].len = q->len;
}
(sc->funs->recv) (sc, sg_list, sg_len);
ecosif_input(netif, p);
CYGARC_HAL_RESTORE_GP();
}
How can i handle this problem? I did not found any solution here in the
older topics, where this problem was also mentioned. I can't raise the pbuf
number or size because i don't have enough memory on my device for it. Is
there any way to say to the stack that it should reset the buffers or
something like this?
I have activated the SYS_ARCH_PROTECT defines in the lwip stack for critical
parts so it is thread save.
Regards Fred
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