Date: Thu, 29 Dec 2005 00:37:20 -0800 (PST) From: Joe Smit <noemail4535@yahoo.com> To: freebsd-alpha@freebsd.org Subject: alignment fault in vx driver on 5.4 Message-ID: <20051229083720.92811.qmail@web30415.mail.mud.yahoo.com>
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Hello, I've put together an alpha PC164 500mhz system
with a 3Com 3C590
etherlink 3, running Freebsd 5.4. I use the vx driver
for the 3c590, but this
results in a unaligned panic on the first ifconfig.
The driver is attempting to
write from an unaligned character array, 32 bits at a
time. So here's a simple
patch that only writes 1 byte at a time.
This driver doesn't seem to do dma and is very
inefficient as a
result - about 30% cpu overhead for 10 mbits/s. I
don't think the
original code using write_multi_4 was any faster. I
guess I'll
have to get a newer nic.
--- if_vx.c.original Thu Dec 1 01:21:31 2005
+++ if_vx.c Sat Dec 24 13:33:50 2005
@@ -454,13 +454,8 @@
CSR_WRITE_4(sc, VX_W1_TX_PIO_WR_1, len |
TX_INDICATE);
while (m) {
- if (m->m_len > 3)
- bus_space_write_multi_4(sc->bst, sc->bsh,
- VX_W1_TX_PIO_WR_1, (u_int32_t *)mtod(m, caddr_t),
m->m_len / 4);
- if (m->m_len & 3)
- bus_space_write_multi_1(sc->bst, sc->bsh,
- VX_W1_TX_PIO_WR_1,
- mtod(m, caddr_t) + (m->m_len & ~3) , m->m_len & 3);
+ bus_space_write_multi_1(sc->bst, sc->bsh,
VX_W1_TX_PIO_WR_1,
+ mtod(m, caddr_t), m->m_len);
m = m_free(m);
}
while (pad--)
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