Hi!
I think I found a problem in io/eth/current/src/net/eth_drv.c in eth_drv_send
I use the current CVS.
In eth_drv.c at line 706 there is a check
"if ( MAX_ETH_DRV_SG < sg_len )"
I think it have to be
"if ( MAX_ETH_DRV_SG <= sg_len )"
for explanation see the snippet at the end of teh file from eth_drv.c, look for
lines containing !!!!!
By the way is there any better solution for the problem (MAX_ETH_DRV_SG <=
sg_len)
than simply "drop it on the floor" (comment from the file). It's not too nice!
sg_len = 0; total_len = 0;
for (m = m0; m ; m = m->m_next) {
data = mtod(m, u_char *);
len = m->m_len;
total_len += len;
sg_list[sg_len].buf = (CYG_ADDRESS)data;
sg_list[sg_len].len = len; // !!!!!! largest sg_len here is
MAX_ETH_DRV_SG
if ( len )
sg_len++; // !!!!!! largest sg_len here
is MAX_ETH_DRV_SG+1 (after ++)
#ifdef CYGDBG_IO_ETH_DRIVERS_DEBUG
if (cyg_io_eth_net_debug) {
START_CONSOLE();
diag_printf("xmit %d bytes at %p sg[%d]\n", len, data, sg_len);
if ( cyg_io_eth_net_debug > 1)
diag_dump_buf(data, len);
END_CONSOLE();
}
#endif
if ( MAX_ETH_DRV_SG < sg_len ) { // !!!!!! true at sg_len =
MAX_ETH_DRV_SG+1
#ifdef CYGPKG_IO_ETH_DRIVERS_WARN_NO_MBUFS
int needed = 0;
struct mbuf *m1;
for (m1 = m0; m1 ; m1 = m1->m_next) needed++;
START_CONSOLE();
diag_printf("too many mbufs to tx, %d > %d, need %d\n",
sg_len, MAX_ETH_DRV_SG, needed );
END_CONSOLE();
#endif
sg_len = 0;
break; // drop it on the floor
}
}
Best regards,
Ferenc Deak
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