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freebsd-dev/sys/dev/sn/if_sn.c
Robert Watson 2a8c860fe3 In order to reduce use of M_EXT outside of the mbuf allocator and 
socket-buffer implementations, introduce a return value for MCLGET()
(and m_cljget() that underlies it) to allow the caller to avoid testing
M_EXT itself.  Update all callers to use the return value.

With this change, very few network device drivers remain aware of
M_EXT; the primary exceptions lie in mbuf-chain pretty printers for
debugging, and in a few cases, custom mbuf and cluster allocation
implementations.

NB: This is a difficult-to-test change as it touches many drivers for
which I don't have physical devices.  Instead we've gone for intensive
review, but further post-commit review would definitely be appreciated
to spot errors where changes could not easily be made mechanically,
but were largely mechanical in nature.

Differential Revision:	https://reviews.freebsd.org/D1440
Reviewed by:	adrian, bz, gnn
Sponsored by:	EMC / Isilon Storage Division
2015-01-06 12:59:37 +00:00

1436 lines
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/*-
* Copyright (c) 1996 Gardner Buchanan <gbuchanan@shl.com>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Gardner Buchanan.
* 4. The name of Gardner Buchanan may not be used to endorse or promote
* products derived from this software without specific prior written
* permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
/*
* This is a driver for SMC's 9000 series of Ethernet adapters.
*
* This FreeBSD driver is derived from the smc9194 Linux driver by
* Erik Stahlman and is Copyright (C) 1996 by Erik Stahlman.
* This driver also shamelessly borrows from the FreeBSD ep driver
* which is Copyright (C) 1994 Herb Peyerl <hpeyerl@novatel.ca>
* All rights reserved.
*
* It is set up for my SMC91C92 equipped Ampro LittleBoard embedded
* PC. It is adapted from Erik Stahlman's Linux driver which worked
* with his EFA Info*Express SVC VLB adaptor. According to SMC's databook,
* it will work for the entire SMC 9xxx series. (Ha Ha)
*
* "Features" of the SMC chip:
* 4608 byte packet memory. (for the 91C92. Others have more)
* EEPROM for configuration
* AUI/TP selection
*
* Authors:
* Erik Stahlman erik@vt.edu
* Herb Peyerl hpeyerl@novatel.ca
* Andres Vega Garcia avega@sophia.inria.fr
* Serge Babkin babkin@hq.icb.chel.su
* Gardner Buchanan gbuchanan@shl.com
*
* Sources:
* o SMC databook
* o "smc9194.c:v0.10(FIXED) 02/15/96 by Erik Stahlman (erik@vt.edu)"
* o "if_ep.c,v 1.19 1995/01/24 20:53:45 davidg Exp"
*
* Known Bugs:
* o Setting of the hardware address isn't supported.
* o Hardware padding isn't used.
*/
/*
* Modifications for Megahertz X-Jack Ethernet Card (XJ-10BT)
*
* Copyright (c) 1996 by Tatsumi Hosokawa <hosokawa@jp.FreeBSD.org>
* BSD-nomads, Tokyo, Japan.
*/
/*
* Multicast support by Kei TANAKA <kei@pal.xerox.com>
* Special thanks to itojun@itojun.org
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/errno.h>
#include <sys/kernel.h>
#include <sys/sockio.h>
#include <sys/mbuf.h>
#include <sys/socket.h>
#include <sys/syslog.h>
#include <sys/module.h>
#include <sys/bus.h>
#include <machine/bus.h>
#include <machine/resource.h>
#include <sys/rman.h>
#include <net/ethernet.h>
#include <net/if.h>
#include <net/if_var.h>
#include <net/if_arp.h>
#include <net/if_dl.h>
#include <net/if_types.h>
#include <net/if_mib.h>
#ifdef INET
#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/in_var.h>
#include <netinet/ip.h>
#endif
#include <net/bpf.h>
#include <net/bpfdesc.h>
#include <dev/sn/if_snreg.h>
#include <dev/sn/if_snvar.h>
/* Exported variables */
devclass_t sn_devclass;
static int snioctl(struct ifnet * ifp, u_long, caddr_t);
static void snresume(struct ifnet *);
static void snintr_locked(struct sn_softc *);
static void sninit_locked(void *);
static void snstart_locked(struct ifnet *);
static void sninit(void *);
static void snread(struct ifnet *);
static void snstart(struct ifnet *);
static void snstop(struct sn_softc *);
static void snwatchdog(void *);
static void sn_setmcast(struct sn_softc *);
static int sn_getmcf(struct ifnet *ifp, u_char *mcf);
/* I (GB) have been unlucky getting the hardware padding
* to work properly.
*/
#define SW_PAD
static const char *chip_ids[15] = {
NULL, NULL, NULL,
/* 3 */ "SMC91C90/91C92",
/* 4 */ "SMC91C94/91C96",
/* 5 */ "SMC91C95",
NULL,
/* 7 */ "SMC91C100",
/* 8 */ "SMC91C100FD",
/* 9 */ "SMC91C110",
NULL, NULL,
NULL, NULL, NULL
};
int
sn_attach(device_t dev)
{
struct sn_softc *sc = device_get_softc(dev);
struct ifnet *ifp;
uint16_t i;
uint8_t *p;
int rev;
uint16_t address;
int err;
u_char eaddr[6];
ifp = sc->ifp = if_alloc(IFT_ETHER);
if (ifp == NULL) {
device_printf(dev, "can not if_alloc()\n");
return (ENOSPC);
}
SN_LOCK_INIT(sc);
callout_init_mtx(&sc->watchdog, &sc->sc_mtx, 0);
snstop(sc);
sc->pages_wanted = -1;
if (bootverbose || 1) {
SMC_SELECT_BANK(sc, 3);
rev = (CSR_READ_2(sc, REVISION_REG_W) >> 4) & 0xf;
if (chip_ids[rev])
device_printf(dev, " %s ", chip_ids[rev]);
else
device_printf(dev, " unsupported chip: rev %d ", rev);
SMC_SELECT_BANK(sc, 1);
i = CSR_READ_2(sc, CONFIG_REG_W);
printf("%s\n", i & CR_AUI_SELECT ? "AUI" : "UTP");
}
/*
* Read the station address from the chip. The MAC address is bank 1,
* regs 4 - 9
*/
SMC_SELECT_BANK(sc, 1);
p = (uint8_t *) eaddr;
for (i = 0; i < 6; i += 2) {
address = CSR_READ_2(sc, IAR_ADDR0_REG_W + i);
p[i + 1] = address >> 8;
p[i] = address & 0xFF;
}
ifp->if_softc = sc;
if_initname(ifp, device_get_name(dev), device_get_unit(dev));
ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST;
ifp->if_start = snstart;
ifp->if_ioctl = snioctl;
ifp->if_init = sninit;
ifp->if_baudrate = 10000000;
IFQ_SET_MAXLEN(&ifp->if_snd, ifqmaxlen);
ifp->if_snd.ifq_maxlen = ifqmaxlen;
IFQ_SET_READY(&ifp->if_snd);
ether_ifattach(ifp, eaddr);
/*
* Activate the interrupt so we can get card interrupts. This
* needs to be done last so that we don't have/hold the lock
* during startup to avoid LORs in the network layer.
*/
if ((err = bus_setup_intr(dev, sc->irq_res,
INTR_TYPE_NET | INTR_MPSAFE, NULL, sn_intr, sc,
&sc->intrhand)) != 0) {
sn_detach(dev);
return err;
}
return 0;
}
int
sn_detach(device_t dev)
{
struct sn_softc *sc = device_get_softc(dev);
struct ifnet *ifp = sc->ifp;
ether_ifdetach(ifp);
SN_LOCK(sc);
snstop(sc);
SN_UNLOCK(sc);
callout_drain(&sc->watchdog);
sn_deactivate(dev);
if_free(ifp);
SN_LOCK_DESTROY(sc);
return 0;
}
static void
sninit(void *xsc)
{
struct sn_softc *sc = xsc;
SN_LOCK(sc);
sninit_locked(sc);
SN_UNLOCK(sc);
}
/*
* Reset and initialize the chip
*/
static void
sninit_locked(void *xsc)
{
struct sn_softc *sc = xsc;
struct ifnet *ifp = sc->ifp;
int flags;
int mask;
SN_ASSERT_LOCKED(sc);
/*
* This resets the registers mostly to defaults, but doesn't affect
* EEPROM. After the reset cycle, we pause briefly for the chip to
* be happy.
*/
SMC_SELECT_BANK(sc, 0);
CSR_WRITE_2(sc, RECV_CONTROL_REG_W, RCR_SOFTRESET);
SMC_DELAY(sc);
CSR_WRITE_2(sc, RECV_CONTROL_REG_W, 0x0000);
SMC_DELAY(sc);
SMC_DELAY(sc);
CSR_WRITE_2(sc, TXMIT_CONTROL_REG_W, 0x0000);
/*
* Set the control register to automatically release succesfully
* transmitted packets (making the best use out of our limited
* memory) and to enable the EPH interrupt on certain TX errors.
*/
SMC_SELECT_BANK(sc, 1);
CSR_WRITE_2(sc, CONTROL_REG_W, (CTR_AUTO_RELEASE | CTR_TE_ENABLE |
CTR_CR_ENABLE | CTR_LE_ENABLE));
/* Set squelch level to 240mV (default 480mV) */
flags = CSR_READ_2(sc, CONFIG_REG_W);
flags |= CR_SET_SQLCH;
CSR_WRITE_2(sc, CONFIG_REG_W, flags);
/*
* Reset the MMU and wait for it to be un-busy.
*/
SMC_SELECT_BANK(sc, 2);
CSR_WRITE_2(sc, MMU_CMD_REG_W, MMUCR_RESET);
while (CSR_READ_2(sc, MMU_CMD_REG_W) & MMUCR_BUSY) /* NOTHING */
;
/*
* Disable all interrupts
*/
CSR_WRITE_1(sc, INTR_MASK_REG_B, 0x00);
sn_setmcast(sc);
/*
* Set the transmitter control. We want it enabled.
*/
flags = TCR_ENABLE;
#ifndef SW_PAD
/*
* I (GB) have been unlucky getting this to work.
*/
flags |= TCR_PAD_ENABLE;
#endif /* SW_PAD */
CSR_WRITE_2(sc, TXMIT_CONTROL_REG_W, flags);
/*
* Now, enable interrupts
*/
SMC_SELECT_BANK(sc, 2);
mask = IM_EPH_INT |
IM_RX_OVRN_INT |
IM_RCV_INT |
IM_TX_INT;
CSR_WRITE_1(sc, INTR_MASK_REG_B, mask);
sc->intr_mask = mask;
sc->pages_wanted = -1;
/*
* Mark the interface running but not active.
*/
ifp->if_drv_flags |= IFF_DRV_RUNNING;
ifp->if_drv_flags &= ~IFF_DRV_OACTIVE;
callout_reset(&sc->watchdog, hz, snwatchdog, sc);
/*
* Attempt to push out any waiting packets.
*/
snstart_locked(ifp);
}
static void
snstart(struct ifnet *ifp)
{
struct sn_softc *sc = ifp->if_softc;
SN_LOCK(sc);
snstart_locked(ifp);
SN_UNLOCK(sc);
}
static void
snstart_locked(struct ifnet *ifp)
{
struct sn_softc *sc = ifp->if_softc;
u_int len;
struct mbuf *m;
struct mbuf *top;
int pad;
int mask;
uint16_t length;
uint16_t numPages;
uint8_t packet_no;
int time_out;
int junk = 0;
SN_ASSERT_LOCKED(sc);
if (ifp->if_drv_flags & IFF_DRV_OACTIVE)
return;
if (sc->pages_wanted != -1) {
if_printf(ifp, "snstart() while memory allocation pending\n");
return;
}
startagain:
/*
* Sneak a peek at the next packet
*/
m = ifp->if_snd.ifq_head;
if (m == 0)
return;
/*
* Compute the frame length and set pad to give an overall even
* number of bytes. Below we assume that the packet length is even.
*/
for (len = 0, top = m; m; m = m->m_next)
len += m->m_len;
pad = (len & 1);
/*
* We drop packets that are too large. Perhaps we should truncate
* them instead?
*/
if (len + pad > ETHER_MAX_LEN - ETHER_CRC_LEN) {
if_printf(ifp, "large packet discarded (A)\n");
if_inc_counter(ifp, IFCOUNTER_OERRORS, 1);
IFQ_DRV_DEQUEUE(&ifp->if_snd, m);
m_freem(m);
goto readcheck;
}
#ifdef SW_PAD
/*
* If HW padding is not turned on, then pad to ETHER_MIN_LEN.
*/
if (len < ETHER_MIN_LEN - ETHER_CRC_LEN)
pad = ETHER_MIN_LEN - ETHER_CRC_LEN - len;
#endif /* SW_PAD */
length = pad + len;
/*
* The MMU wants the number of pages to be the number of 256 byte
* 'pages', minus 1 (A packet can't ever have 0 pages. We also
* include space for the status word, byte count and control bytes in
* the allocation request.
*/
numPages = (length + 6) >> 8;
/*
* Now, try to allocate the memory
*/
SMC_SELECT_BANK(sc, 2);
CSR_WRITE_2(sc, MMU_CMD_REG_W, MMUCR_ALLOC | numPages);
/*
* Wait a short amount of time to see if the allocation request
* completes. Otherwise, I enable the interrupt and wait for
* completion asynchronously.
*/
time_out = MEMORY_WAIT_TIME;
do {
if (CSR_READ_1(sc, INTR_STAT_REG_B) & IM_ALLOC_INT)
break;
} while (--time_out);
if (!time_out || junk > 10) {
/*
* No memory now. Oh well, wait until the chip finds memory
* later. Remember how many pages we were asking for and
* enable the allocation completion interrupt. Also set a
* watchdog in case we miss the interrupt. We mark the
* interface active since there is no point in attempting an
* snstart() until after the memory is available.
*/
mask = CSR_READ_1(sc, INTR_MASK_REG_B) | IM_ALLOC_INT;
CSR_WRITE_1(sc, INTR_MASK_REG_B, mask);
sc->intr_mask = mask;
sc->timer = 1;
ifp->if_drv_flags |= IFF_DRV_OACTIVE;
sc->pages_wanted = numPages;
return;
}
/*
* The memory allocation completed. Check the results.
*/
packet_no = CSR_READ_1(sc, ALLOC_RESULT_REG_B);
if (packet_no & ARR_FAILED) {
if (junk++ > 10)
if_printf(ifp, "Memory allocation failed\n");
goto startagain;
}
/*
* We have a packet number, so tell the card to use it.
*/
CSR_WRITE_1(sc, PACKET_NUM_REG_B, packet_no);
/*
* Point to the beginning of the packet
*/
CSR_WRITE_2(sc, POINTER_REG_W, PTR_AUTOINC | 0x0000);
/*
* Send the packet length (+6 for status, length and control byte)
* and the status word (set to zeros)
*/
CSR_WRITE_2(sc, DATA_REG_W, 0);
CSR_WRITE_1(sc, DATA_REG_B, (length + 6) & 0xFF);
CSR_WRITE_1(sc, DATA_REG_B, (length + 6) >> 8);
/*
* Get the packet from the kernel. This will include the Ethernet
* frame header, MAC Addresses etc.
*/
IFQ_DRV_DEQUEUE(&ifp->if_snd, m);
/*
* Push out the data to the card.
*/
for (top = m; m != 0; m = m->m_next) {
/*
* Push out words.
*/
CSR_WRITE_MULTI_2(sc, DATA_REG_W, mtod(m, uint16_t *),
m->m_len / 2);
/*
* Push out remaining byte.
*/
if (m->m_len & 1)
CSR_WRITE_1(sc, DATA_REG_B,
*(mtod(m, caddr_t) + m->m_len - 1));
}
/*
* Push out padding.
*/
while (pad > 1) {
CSR_WRITE_2(sc, DATA_REG_W, 0);
pad -= 2;
}
if (pad)
CSR_WRITE_1(sc, DATA_REG_B, 0);
/*
* Push out control byte and unused packet byte The control byte is 0
* meaning the packet is even lengthed and no special CRC handling is
* desired.
*/
CSR_WRITE_2(sc, DATA_REG_W, 0);
/*
* Enable the interrupts and let the chipset deal with it Also set a
* watchdog in case we miss the interrupt.
*/
mask = CSR_READ_1(sc, INTR_MASK_REG_B) | (IM_TX_INT | IM_TX_EMPTY_INT);
CSR_WRITE_1(sc, INTR_MASK_REG_B, mask);
sc->intr_mask = mask;
CSR_WRITE_2(sc, MMU_CMD_REG_W, MMUCR_ENQUEUE);
ifp->if_drv_flags |= IFF_DRV_OACTIVE;
sc->timer = 1;
BPF_MTAP(ifp, top);
if_inc_counter(ifp, IFCOUNTER_OPACKETS, 1);
m_freem(top);
readcheck:
/*
* Is another packet coming in? We don't want to overflow the tiny
* RX FIFO. If nothing has arrived then attempt to queue another
* transmit packet.
*/
if (CSR_READ_2(sc, FIFO_PORTS_REG_W) & FIFO_REMPTY)
goto startagain;
return;
}
/* Resume a packet transmit operation after a memory allocation
* has completed.
*
* This is basically a hacked up copy of snstart() which handles
* a completed memory allocation the same way snstart() does.
* It then passes control to snstart to handle any other queued
* packets.
*/
static void
snresume(struct ifnet *ifp)
{
struct sn_softc *sc = ifp->if_softc;
u_int len;
struct mbuf *m;
struct mbuf *top;
int pad;
int mask;
uint16_t length;
uint16_t numPages;
uint16_t pages_wanted;
uint8_t packet_no;
if (sc->pages_wanted < 0)
return;
pages_wanted = sc->pages_wanted;
sc->pages_wanted = -1;
/*
* Sneak a peek at the next packet
*/
m = ifp->if_snd.ifq_head;
if (m == 0) {
if_printf(ifp, "snresume() with nothing to send\n");
return;
}
/*
* Compute the frame length and set pad to give an overall even
* number of bytes. Below we assume that the packet length is even.
*/
for (len = 0, top = m; m; m = m->m_next)
len += m->m_len;
pad = (len & 1);
/*
* We drop packets that are too large. Perhaps we should truncate
* them instead?
*/
if (len + pad > ETHER_MAX_LEN - ETHER_CRC_LEN) {
if_printf(ifp, "large packet discarded (B)\n");
if_inc_counter(ifp, IFCOUNTER_OERRORS, 1);
IFQ_DRV_DEQUEUE(&ifp->if_snd, m);
m_freem(m);
return;
}
#ifdef SW_PAD
/*
* If HW padding is not turned on, then pad to ETHER_MIN_LEN.
*/
if (len < ETHER_MIN_LEN - ETHER_CRC_LEN)
pad = ETHER_MIN_LEN - ETHER_CRC_LEN - len;
#endif /* SW_PAD */
length = pad + len;
/*
* The MMU wants the number of pages to be the number of 256 byte
* 'pages', minus 1 (A packet can't ever have 0 pages. We also
* include space for the status word, byte count and control bytes in
* the allocation request.
*/
numPages = (length + 6) >> 8;
SMC_SELECT_BANK(sc, 2);
/*
* The memory allocation completed. Check the results. If it failed,
* we simply set a watchdog timer and hope for the best.
*/
packet_no = CSR_READ_1(sc, ALLOC_RESULT_REG_B);
if (packet_no & ARR_FAILED) {
if_printf(ifp, "Memory allocation failed. Weird.\n");
sc->timer = 1;
goto try_start;
}
/*
* We have a packet number, so tell the card to use it.
*/
CSR_WRITE_1(sc, PACKET_NUM_REG_B, packet_no);
/*
* Now, numPages should match the pages_wanted recorded when the
* memory allocation was initiated.
*/
if (pages_wanted != numPages) {
if_printf(ifp, "memory allocation wrong size. Weird.\n");
/*
* If the allocation was the wrong size we simply release the
* memory once it is granted. Wait for the MMU to be un-busy.
*/
while (CSR_READ_2(sc, MMU_CMD_REG_W) & MMUCR_BUSY) /* NOTHING */
;
CSR_WRITE_2(sc, MMU_CMD_REG_W, MMUCR_FREEPKT);
return;
}
/*
* Point to the beginning of the packet
*/
CSR_WRITE_2(sc, POINTER_REG_W, PTR_AUTOINC | 0x0000);
/*
* Send the packet length (+6 for status, length and control byte)
* and the status word (set to zeros)
*/
CSR_WRITE_2(sc, DATA_REG_W, 0);
CSR_WRITE_1(sc, DATA_REG_B, (length + 6) & 0xFF);
CSR_WRITE_1(sc, DATA_REG_B, (length + 6) >> 8);
/*
* Get the packet from the kernel. This will include the Ethernet
* frame header, MAC Addresses etc.
*/
IFQ_DRV_DEQUEUE(&ifp->if_snd, m);
/*
* Push out the data to the card.
*/
for (top = m; m != 0; m = m->m_next) {
/*
* Push out words.
*/
CSR_WRITE_MULTI_2(sc, DATA_REG_W, mtod(m, uint16_t *),
m->m_len / 2);
/*
* Push out remaining byte.
*/
if (m->m_len & 1)
CSR_WRITE_1(sc, DATA_REG_B,
*(mtod(m, caddr_t) + m->m_len - 1));
}
/*
* Push out padding.
*/
while (pad > 1) {
CSR_WRITE_2(sc, DATA_REG_W, 0);
pad -= 2;
}
if (pad)
CSR_WRITE_1(sc, DATA_REG_B, 0);
/*
* Push out control byte and unused packet byte The control byte is 0
* meaning the packet is even lengthed and no special CRC handling is
* desired.
*/
CSR_WRITE_2(sc, DATA_REG_W, 0);
/*
* Enable the interrupts and let the chipset deal with it Also set a
* watchdog in case we miss the interrupt.
*/
mask = CSR_READ_1(sc, INTR_MASK_REG_B) | (IM_TX_INT | IM_TX_EMPTY_INT);
CSR_WRITE_1(sc, INTR_MASK_REG_B, mask);
sc->intr_mask = mask;
CSR_WRITE_2(sc, MMU_CMD_REG_W, MMUCR_ENQUEUE);
BPF_MTAP(ifp, top);
if_inc_counter(ifp, IFCOUNTER_OPACKETS, 1);
m_freem(top);
try_start:
/*
* Now pass control to snstart() to queue any additional packets
*/
ifp->if_drv_flags &= ~IFF_DRV_OACTIVE;
snstart_locked(ifp);
/*
* We've sent something, so we're active. Set a watchdog in case the
* TX_EMPTY interrupt is lost.
*/
ifp->if_drv_flags |= IFF_DRV_OACTIVE;
sc->timer = 1;
return;
}
void
sn_intr(void *arg)
{
struct sn_softc *sc = (struct sn_softc *) arg;
SN_LOCK(sc);
snintr_locked(sc);
SN_UNLOCK(sc);
}
static void
snintr_locked(struct sn_softc *sc)
{
int status, interrupts;
struct ifnet *ifp = sc->ifp;
/*
* Chip state registers
*/
uint8_t mask;
uint8_t packet_no;
uint16_t tx_status;
uint16_t card_stats;
/*
* Clear the watchdog.
*/
sc->timer = 0;
SMC_SELECT_BANK(sc, 2);
/*
* Obtain the current interrupt mask and clear the hardware mask
* while servicing interrupts.
*/
mask = CSR_READ_1(sc, INTR_MASK_REG_B);
CSR_WRITE_1(sc, INTR_MASK_REG_B, 0x00);
/*
* Get the set of interrupts which occurred and eliminate any which
* are masked.
*/
interrupts = CSR_READ_1(sc, INTR_STAT_REG_B);
status = interrupts & mask;
/*
* Now, process each of the interrupt types.
*/
/*
* Receive Overrun.
*/
if (status & IM_RX_OVRN_INT) {
/*
* Acknowlege Interrupt
*/
SMC_SELECT_BANK(sc, 2);
CSR_WRITE_1(sc, INTR_ACK_REG_B, IM_RX_OVRN_INT);
if_inc_counter(ifp, IFCOUNTER_IERRORS, 1);
}
/*
* Got a packet.
*/
if (status & IM_RCV_INT) {
int packet_number;
SMC_SELECT_BANK(sc, 2);
packet_number = CSR_READ_2(sc, FIFO_PORTS_REG_W);
if (packet_number & FIFO_REMPTY) {
/*
* we got called , but nothing was on the FIFO
*/
printf("sn: Receive interrupt with nothing on FIFO\n");
goto out;
}
snread(ifp);
}
/*
* An on-card memory allocation came through.
*/
if (status & IM_ALLOC_INT) {
/*
* Disable this interrupt.
*/
mask &= ~IM_ALLOC_INT;
ifp->if_drv_flags &= ~IFF_DRV_OACTIVE;
snresume(ifp);
}
/*
* TX Completion. Handle a transmit error message. This will only be
* called when there is an error, because of the AUTO_RELEASE mode.
*/
if (status & IM_TX_INT) {
/*
* Acknowlege Interrupt
*/
SMC_SELECT_BANK(sc, 2);
CSR_WRITE_1(sc, INTR_ACK_REG_B, IM_TX_INT);
packet_no = CSR_READ_2(sc, FIFO_PORTS_REG_W);
packet_no &= FIFO_TX_MASK;
/*
* select this as the packet to read from
*/
CSR_WRITE_1(sc, PACKET_NUM_REG_B, packet_no);
/*
* Position the pointer to the first word from this packet
*/
CSR_WRITE_2(sc, POINTER_REG_W, PTR_AUTOINC | PTR_READ | 0x0000);
/*
* Fetch the TX status word. The value found here will be a
* copy of the EPH_STATUS_REG_W at the time the transmit
* failed.
*/
tx_status = CSR_READ_2(sc, DATA_REG_W);
if (tx_status & EPHSR_TX_SUC) {
device_printf(sc->dev,
"Successful packet caused interrupt\n");
} else {
if_inc_counter(ifp, IFCOUNTER_OERRORS, 1);
}
if (tx_status & EPHSR_LATCOL)
if_inc_counter(ifp, IFCOUNTER_COLLISIONS, 1);
/*
* Some of these errors will have disabled transmit.
* Re-enable transmit now.
*/
SMC_SELECT_BANK(sc, 0);
#ifdef SW_PAD
CSR_WRITE_2(sc, TXMIT_CONTROL_REG_W, TCR_ENABLE);
#else
CSR_WRITE_2(sc, TXMIT_CONTROL_REG_W, TCR_ENABLE | TCR_PAD_ENABLE);
#endif /* SW_PAD */
/*
* kill the failed packet. Wait for the MMU to be un-busy.
*/
SMC_SELECT_BANK(sc, 2);
while (CSR_READ_2(sc, MMU_CMD_REG_W) & MMUCR_BUSY) /* NOTHING */
;
CSR_WRITE_2(sc, MMU_CMD_REG_W, MMUCR_FREEPKT);
/*
* Attempt to queue more transmits.
*/
ifp->if_drv_flags &= ~IFF_DRV_OACTIVE;
snstart_locked(ifp);
}
/*
* Transmit underrun. We use this opportunity to update transmit
* statistics from the card.
*/
if (status & IM_TX_EMPTY_INT) {
/*
* Acknowlege Interrupt
*/
SMC_SELECT_BANK(sc, 2);
CSR_WRITE_1(sc, INTR_ACK_REG_B, IM_TX_EMPTY_INT);
/*
* Disable this interrupt.
*/
mask &= ~IM_TX_EMPTY_INT;
SMC_SELECT_BANK(sc, 0);
card_stats = CSR_READ_2(sc, COUNTER_REG_W);
/*
* Single collisions
*/
if_inc_counter(ifp, IFCOUNTER_COLLISIONS, card_stats & ECR_COLN_MASK);
/*
* Multiple collisions
*/
if_inc_counter(ifp, IFCOUNTER_COLLISIONS, (card_stats & ECR_MCOLN_MASK) >> 4);
SMC_SELECT_BANK(sc, 2);
/*
* Attempt to enqueue some more stuff.
*/
ifp->if_drv_flags &= ~IFF_DRV_OACTIVE;
snstart_locked(ifp);
}
/*
* Some other error. Try to fix it by resetting the adapter.
*/
if (status & IM_EPH_INT) {
snstop(sc);
sninit_locked(sc);
}
out:
/*
* Handled all interrupt sources.
*/
SMC_SELECT_BANK(sc, 2);
/*
* Reestablish interrupts from mask which have not been deselected
* during this interrupt. Note that the hardware mask, which was set
* to 0x00 at the start of this service routine, may have been
* updated by one or more of the interrupt handers and we must let
* those new interrupts stay enabled here.
*/
mask |= CSR_READ_1(sc, INTR_MASK_REG_B);
CSR_WRITE_1(sc, INTR_MASK_REG_B, mask);
sc->intr_mask = mask;
}
static void
snread(struct ifnet *ifp)
{
struct sn_softc *sc = ifp->if_softc;
struct ether_header *eh;
struct mbuf *m;
short status;
int packet_number;
uint16_t packet_length;
uint8_t *data;
SMC_SELECT_BANK(sc, 2);
#if 0
packet_number = CSR_READ_2(sc, FIFO_PORTS_REG_W);
if (packet_number & FIFO_REMPTY) {
/*
* we got called , but nothing was on the FIFO
*/
printf("sn: Receive interrupt with nothing on FIFO\n");
return;
}
#endif
read_another:
/*
* Start reading from the start of the packet. Since PTR_RCV is set,
* packet number is found in FIFO_PORTS_REG_W, FIFO_RX_MASK.
*/
CSR_WRITE_2(sc, POINTER_REG_W, PTR_READ | PTR_RCV | PTR_AUTOINC | 0x0000);
/*
* First two words are status and packet_length
*/
status = CSR_READ_2(sc, DATA_REG_W);
packet_length = CSR_READ_2(sc, DATA_REG_W) & RLEN_MASK;
/*
* The packet length contains 3 extra words: status, length, and a
* extra word with the control byte.
*/
packet_length -= 6;
/*
* Account for receive errors and discard.
*/
if (status & RS_ERRORS) {
if_inc_counter(ifp, IFCOUNTER_IERRORS, 1);
goto out;
}
/*
* A packet is received.
*/
/*
* Adjust for odd-length packet.
*/
if (status & RS_ODDFRAME)
packet_length++;
/*
* Allocate a header mbuf from the kernel.
*/
MGETHDR(m, M_NOWAIT, MT_DATA);
if (m == NULL)
goto out;
m->m_pkthdr.rcvif = ifp;
m->m_pkthdr.len = m->m_len = packet_length;
/*
* Attach an mbuf cluster.
*/
if (!(MCLGET(m, M_NOWAIT))) {
m_freem(m);
if_inc_counter(ifp, IFCOUNTER_IERRORS, 1);
printf("sn: snread() kernel memory allocation problem\n");
goto out;
}
eh = mtod(m, struct ether_header *);
/*
* Get packet, including link layer address, from interface.
*/
data = (uint8_t *) eh;
CSR_READ_MULTI_2(sc, DATA_REG_W, (uint16_t *) data, packet_length >> 1);
if (packet_length & 1) {
data += packet_length & ~1;
*data = CSR_READ_1(sc, DATA_REG_B);
}
if_inc_counter(ifp, IFCOUNTER_IPACKETS, 1);
/*
* Remove link layer addresses and whatnot.
*/
m->m_pkthdr.len = m->m_len = packet_length;
/*
* Drop locks before calling if_input() since it may re-enter
* snstart() in the netisr case. This would result in a
* lock reversal. Better performance might be obtained by
* chaining all packets received, dropping the lock, and then
* calling if_input() on each one.
*/
SN_UNLOCK(sc);
(*ifp->if_input)(ifp, m);
SN_LOCK(sc);
out:
/*
* Error or good, tell the card to get rid of this packet Wait for
* the MMU to be un-busy.
*/
SMC_SELECT_BANK(sc, 2);
while (CSR_READ_2(sc, MMU_CMD_REG_W) & MMUCR_BUSY) /* NOTHING */
;
CSR_WRITE_2(sc, MMU_CMD_REG_W, MMUCR_RELEASE);
/*
* Check whether another packet is ready
*/
packet_number = CSR_READ_2(sc, FIFO_PORTS_REG_W);
if (packet_number & FIFO_REMPTY) {
return;
}
goto read_another;
}
/*
* Handle IOCTLS. This function is completely stolen from if_ep.c
* As with its progenitor, it does not handle hardware address
* changes.
*/
static int
snioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
{
struct sn_softc *sc = ifp->if_softc;
int error = 0;
switch (cmd) {
case SIOCSIFFLAGS:
SN_LOCK(sc);
if ((ifp->if_flags & IFF_UP) == 0 &&
ifp->if_drv_flags & IFF_DRV_RUNNING) {
snstop(sc);
} else {
/* reinitialize card on any parameter change */
sninit_locked(sc);
}
SN_UNLOCK(sc);
break;
case SIOCADDMULTI:
case SIOCDELMULTI:
/* update multicast filter list. */
SN_LOCK(sc);
sn_setmcast(sc);
error = 0;
SN_UNLOCK(sc);
break;
default:
error = ether_ioctl(ifp, cmd, data);
break;
}
return (error);
}
static void
snwatchdog(void *arg)
{
struct sn_softc *sc;
sc = arg;
SN_ASSERT_LOCKED(sc);
callout_reset(&sc->watchdog, hz, snwatchdog, sc);
if (sc->timer == 0 || --sc->timer > 0)
return;
snintr_locked(sc);
}
/* 1. zero the interrupt mask
* 2. clear the enable receive flag
* 3. clear the enable xmit flags
*/
static void
snstop(struct sn_softc *sc)
{
struct ifnet *ifp = sc->ifp;
/*
* Clear interrupt mask; disable all interrupts.
*/
SMC_SELECT_BANK(sc, 2);
CSR_WRITE_1(sc, INTR_MASK_REG_B, 0x00);
/*
* Disable transmitter and Receiver
*/
SMC_SELECT_BANK(sc, 0);
CSR_WRITE_2(sc, RECV_CONTROL_REG_W, 0x0000);
CSR_WRITE_2(sc, TXMIT_CONTROL_REG_W, 0x0000);
/*
* Cancel watchdog.
*/
sc->timer = 0;
callout_stop(&sc->watchdog);
ifp->if_drv_flags &= ~(IFF_DRV_RUNNING | IFF_DRV_OACTIVE);
}
int
sn_activate(device_t dev)
{
struct sn_softc *sc = device_get_softc(dev);
sc->port_rid = 0;
sc->port_res = bus_alloc_resource(dev, SYS_RES_IOPORT, &sc->port_rid,
0, ~0, SMC_IO_EXTENT, RF_ACTIVE);
if (!sc->port_res) {
if (bootverbose)
device_printf(dev, "Cannot allocate ioport\n");
return ENOMEM;
}
sc->irq_rid = 0;
sc->irq_res = bus_alloc_resource_any(dev, SYS_RES_IRQ, &sc->irq_rid,
RF_ACTIVE);
if (!sc->irq_res) {
if (bootverbose)
device_printf(dev, "Cannot allocate irq\n");
sn_deactivate(dev);
return ENOMEM;
}
return (0);
}
void
sn_deactivate(device_t dev)
{
struct sn_softc *sc = device_get_softc(dev);
if (sc->intrhand)
bus_teardown_intr(dev, sc->irq_res, sc->intrhand);
sc->intrhand = 0;
if (sc->port_res)
bus_release_resource(dev, SYS_RES_IOPORT, sc->port_rid,
sc->port_res);
sc->port_res = 0;
if (sc->modem_res)
bus_release_resource(dev, SYS_RES_IOPORT, sc->modem_rid,
sc->modem_res);
sc->modem_res = 0;
if (sc->irq_res)
bus_release_resource(dev, SYS_RES_IRQ, sc->irq_rid,
sc->irq_res);
sc->irq_res = 0;
return;
}
/*
* Function: sn_probe(device_t dev)
*
* Purpose:
* Tests to see if a given ioaddr points to an SMC9xxx chip.
* Tries to cause as little damage as possible if it's not a SMC chip.
* Returns a 0 on success
*
* Algorithm:
* (1) see if the high byte of BANK_SELECT is 0x33
* (2) compare the ioaddr with the base register's address
* (3) see if I recognize the chip ID in the appropriate register
*
*
*/
int
sn_probe(device_t dev)
{
struct sn_softc *sc = device_get_softc(dev);
uint16_t bank;
uint16_t revision_register;
uint16_t base_address_register;
int err;
if ((err = sn_activate(dev)) != 0)
return err;
/*
* First, see if the high byte is 0x33
*/
bank = CSR_READ_2(sc, BANK_SELECT_REG_W);
if ((bank & BSR_DETECT_MASK) != BSR_DETECT_VALUE) {
#ifdef SN_DEBUG
device_printf(dev, "test1 failed\n");
#endif
goto error;
}
/*
* The above MIGHT indicate a device, but I need to write to further
* test this. Go to bank 0, then test that the register still
* reports the high byte is 0x33.
*/
CSR_WRITE_2(sc, BANK_SELECT_REG_W, 0x0000);
bank = CSR_READ_2(sc, BANK_SELECT_REG_W);
if ((bank & BSR_DETECT_MASK) != BSR_DETECT_VALUE) {
#ifdef SN_DEBUG
device_printf(dev, "test2 failed\n");
#endif
goto error;
}
/*
* well, we've already written once, so hopefully another time won't
* hurt. This time, I need to switch the bank register to bank 1, so
* I can access the base address register. The contents of the
* BASE_ADDR_REG_W register, after some jiggery pokery, is expected
* to match the I/O port address where the adapter is being probed.
*/
CSR_WRITE_2(sc, BANK_SELECT_REG_W, 0x0001);
base_address_register = (CSR_READ_2(sc, BASE_ADDR_REG_W) >> 3) & 0x3e0;
if (rman_get_start(sc->port_res) != base_address_register) {
/*
* Well, the base address register didn't match. Must not
* have been a SMC chip after all.
*/
#ifdef SN_DEBUG
device_printf(dev, "test3 failed ioaddr = 0x%x, "
"base_address_register = 0x%x\n",
rman_get_start(sc->port_res), base_address_register);
#endif
goto error;
}
/*
* Check if the revision register is something that I recognize.
* These might need to be added to later, as future revisions could
* be added.
*/
CSR_WRITE_2(sc, BANK_SELECT_REG_W, 0x3);
revision_register = CSR_READ_2(sc, REVISION_REG_W);
if (!chip_ids[(revision_register >> 4) & 0xF]) {
/*
* I don't regonize this chip, so...
*/
#ifdef SN_DEBUG
device_printf(dev, "test4 failed\n");
#endif
goto error;
}
/*
* at this point I'll assume that the chip is an SMC9xxx. It might be
* prudent to check a listing of MAC addresses against the hardware
* address, or do some other tests.
*/
sn_deactivate(dev);
return 0;
error:
sn_deactivate(dev);
return ENXIO;
}
#define MCFSZ 8
static void
sn_setmcast(struct sn_softc *sc)
{
struct ifnet *ifp = sc->ifp;
int flags;
uint8_t mcf[MCFSZ];
SN_ASSERT_LOCKED(sc);
/*
* Set the receiver filter. We want receive enabled and auto strip
* of CRC from received packet. If we are promiscuous then set that
* bit too.
*/
flags = RCR_ENABLE | RCR_STRIP_CRC;
if (ifp->if_flags & IFF_PROMISC) {
flags |= RCR_PROMISC | RCR_ALMUL;
} else if (ifp->if_flags & IFF_ALLMULTI) {
flags |= RCR_ALMUL;
} else {
if (sn_getmcf(ifp, mcf)) {
/* set filter */
SMC_SELECT_BANK(sc, 3);
CSR_WRITE_2(sc, MULTICAST1_REG_W,
((uint16_t)mcf[1] << 8) | mcf[0]);
CSR_WRITE_2(sc, MULTICAST2_REG_W,
((uint16_t)mcf[3] << 8) | mcf[2]);
CSR_WRITE_2(sc, MULTICAST3_REG_W,
((uint16_t)mcf[5] << 8) | mcf[4]);
CSR_WRITE_2(sc, MULTICAST4_REG_W,
((uint16_t)mcf[7] << 8) | mcf[6]);
} else {
flags |= RCR_ALMUL;
}
}
SMC_SELECT_BANK(sc, 0);
CSR_WRITE_2(sc, RECV_CONTROL_REG_W, flags);
}
static int
sn_getmcf(struct ifnet *ifp, uint8_t *mcf)
{
int i;
uint32_t index, index2;
uint8_t *af = mcf;
struct ifmultiaddr *ifma;
bzero(mcf, MCFSZ);
if_maddr_rlock(ifp);
TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) {
if (ifma->ifma_addr->sa_family != AF_LINK) {
if_maddr_runlock(ifp);
return 0;
}
index = ether_crc32_le(LLADDR((struct sockaddr_dl *)
ifma->ifma_addr), ETHER_ADDR_LEN) & 0x3f;
index2 = 0;
for (i = 0; i < 6; i++) {
index2 <<= 1;
index2 |= (index & 0x01);
index >>= 1;
}
af[index2 >> 3] |= 1 << (index2 & 7);
}
if_maddr_runlock(ifp);
return 1; /* use multicast filter */
}
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