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freebsd-skq/sys/pci/if_rl.c
attilio b523608331 When user_frac in the polling subsystem is low it is going to busy the 
CPU for too long period than necessary.  Additively, interfaces are kept
polled (in the tick) even if no more packets are available.
In order to avoid such situations a new generic mechanism can be
implemented in proactive way, keeping track of the time spent on any
packet and fragmenting the time for any tick, stopping the processing
as soon as possible.

In order to implement such mechanism, the polling handler needs to
change, returning the number of packets processed.
While the intended logic is not part of this patch, the polling KPI is
broken by this commit, adding an int return value and the new flag
IFCAP_POLLING_NOCOUNT (which will signal that the return value is
meaningless for the installed handler and checking should be skipped).

Bump __FreeBSD_version in order to signal such situation.

Reviewed by:	emaste
Sponsored by:	Sandvine Incorporated
2009-05-30 15:14:44 +00:00

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/*-
* Copyright (c) 1997, 1998
* Bill Paul <wpaul@ctr.columbia.edu>. 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 Bill Paul.
* 4. Neither the name of the author nor the names of any co-contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY Bill Paul AND CONTRIBUTORS ``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 Bill Paul OR THE VOICES IN HIS HEAD
* 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("$FreeBSD$");
/*
* RealTek 8129/8139 PCI NIC driver
*
* Supports several extremely cheap PCI 10/100 adapters based on
* the RealTek chipset. Datasheets can be obtained from
* www.realtek.com.tw.
*
* Written by Bill Paul <wpaul@ctr.columbia.edu>
* Electrical Engineering Department
* Columbia University, New York City
*/
/*
* The RealTek 8139 PCI NIC redefines the meaning of 'low end.' This is
* probably the worst PCI ethernet controller ever made, with the possible
* exception of the FEAST chip made by SMC. The 8139 supports bus-master
* DMA, but it has a terrible interface that nullifies any performance
* gains that bus-master DMA usually offers.
*
* For transmission, the chip offers a series of four TX descriptor
* registers. Each transmit frame must be in a contiguous buffer, aligned
* on a longword (32-bit) boundary. This means we almost always have to
* do mbuf copies in order to transmit a frame, except in the unlikely
* case where a) the packet fits into a single mbuf, and b) the packet
* is 32-bit aligned within the mbuf's data area. The presence of only
* four descriptor registers means that we can never have more than four
* packets queued for transmission at any one time.
*
* Reception is not much better. The driver has to allocate a single large
* buffer area (up to 64K in size) into which the chip will DMA received
* frames. Because we don't know where within this region received packets
* will begin or end, we have no choice but to copy data from the buffer
* area into mbufs in order to pass the packets up to the higher protocol
* levels.
*
* It's impossible given this rotten design to really achieve decent
* performance at 100Mbps, unless you happen to have a 400Mhz PII or
* some equally overmuscled CPU to drive it.
*
* On the bright side, the 8139 does have a built-in PHY, although
* rather than using an MDIO serial interface like most other NICs, the
* PHY registers are directly accessible through the 8139's register
* space. The 8139 supports autonegotiation, as well as a 64-bit multicast
* filter.
*
* The 8129 chip is an older version of the 8139 that uses an external PHY
* chip. The 8129 has a serial MDIO interface for accessing the MII where
* the 8139 lets you directly access the on-board PHY registers. We need
* to select which interface to use depending on the chip type.
*/
#ifdef HAVE_KERNEL_OPTION_HEADERS
#include "opt_device_polling.h"
#endif
#include <sys/param.h>
#include <sys/endian.h>
#include <sys/systm.h>
#include <sys/sockio.h>
#include <sys/mbuf.h>
#include <sys/malloc.h>
#include <sys/kernel.h>
#include <sys/module.h>
#include <sys/socket.h>
#include <sys/sysctl.h>
#include <net/if.h>
#include <net/if_arp.h>
#include <net/ethernet.h>
#include <net/if_dl.h>
#include <net/if_media.h>
#include <net/if_types.h>
#include <net/bpf.h>
#include <machine/bus.h>
#include <machine/resource.h>
#include <sys/bus.h>
#include <sys/rman.h>
#include <dev/mii/mii.h>
#include <dev/mii/miivar.h>
#include <dev/pci/pcireg.h>
#include <dev/pci/pcivar.h>
MODULE_DEPEND(rl, pci, 1, 1, 1);
MODULE_DEPEND(rl, ether, 1, 1, 1);
MODULE_DEPEND(rl, miibus, 1, 1, 1);
/* "device miibus" required. See GENERIC if you get errors here. */
#include "miibus_if.h"
/*
* Default to using PIO access for this driver. On SMP systems,
* there appear to be problems with memory mapped mode: it looks like
* doing too many memory mapped access back to back in rapid succession
* can hang the bus. I'm inclined to blame this on crummy design/construction
* on the part of RealTek. Memory mapped mode does appear to work on
* uniprocessor systems though.
*/
#define RL_USEIOSPACE
#include <pci/if_rlreg.h>
/*
* Various supported device vendors/types and their names.
*/
static struct rl_type rl_devs[] = {
{ RT_VENDORID, RT_DEVICEID_8129, RL_8129,
"RealTek 8129 10/100BaseTX" },
{ RT_VENDORID, RT_DEVICEID_8139, RL_8139,
"RealTek 8139 10/100BaseTX" },
{ RT_VENDORID, RT_DEVICEID_8139D, RL_8139,
"RealTek 8139 10/100BaseTX" },
{ RT_VENDORID, RT_DEVICEID_8138, RL_8139,
"RealTek 8139 10/100BaseTX CardBus" },
{ RT_VENDORID, RT_DEVICEID_8100, RL_8139,
"RealTek 8100 10/100BaseTX" },
{ ACCTON_VENDORID, ACCTON_DEVICEID_5030, RL_8139,
"Accton MPX 5030/5038 10/100BaseTX" },
{ DELTA_VENDORID, DELTA_DEVICEID_8139, RL_8139,
"Delta Electronics 8139 10/100BaseTX" },
{ ADDTRON_VENDORID, ADDTRON_DEVICEID_8139, RL_8139,
"Addtron Technology 8139 10/100BaseTX" },
{ DLINK_VENDORID, DLINK_DEVICEID_530TXPLUS, RL_8139,
"D-Link DFE-530TX+ 10/100BaseTX" },
{ DLINK_VENDORID, DLINK_DEVICEID_690TXD, RL_8139,
"D-Link DFE-690TXD 10/100BaseTX" },
{ NORTEL_VENDORID, ACCTON_DEVICEID_5030, RL_8139,
"Nortel Networks 10/100BaseTX" },
{ COREGA_VENDORID, COREGA_DEVICEID_FETHERCBTXD, RL_8139,
"Corega FEther CB-TXD" },
{ COREGA_VENDORID, COREGA_DEVICEID_FETHERIICBTXD, RL_8139,
"Corega FEtherII CB-TXD" },
{ PEPPERCON_VENDORID, PEPPERCON_DEVICEID_ROLF, RL_8139,
"Peppercon AG ROL-F" },
{ PLANEX_VENDORID, PLANEX_DEVICEID_FNW3603TX, RL_8139,
"Planex FNW-3603-TX" },
{ PLANEX_VENDORID, PLANEX_DEVICEID_FNW3800TX, RL_8139,
"Planex FNW-3800-TX" },
{ CP_VENDORID, RT_DEVICEID_8139, RL_8139,
"Compaq HNE-300" },
{ LEVEL1_VENDORID, LEVEL1_DEVICEID_FPC0106TX, RL_8139,
"LevelOne FPC-0106TX" },
{ EDIMAX_VENDORID, EDIMAX_DEVICEID_EP4103DL, RL_8139,
"Edimax EP-4103DL CardBus" }
};
static int rl_attach(device_t);
static int rl_detach(device_t);
static void rl_dmamap_cb(void *, bus_dma_segment_t *, int, int);
static int rl_dma_alloc(struct rl_softc *);
static void rl_dma_free(struct rl_softc *);
static void rl_eeprom_putbyte(struct rl_softc *, int);
static void rl_eeprom_getword(struct rl_softc *, int, uint16_t *);
static int rl_encap(struct rl_softc *, struct mbuf **);
static int rl_list_tx_init(struct rl_softc *);
static int rl_list_rx_init(struct rl_softc *);
static int rl_ifmedia_upd(struct ifnet *);
static void rl_ifmedia_sts(struct ifnet *, struct ifmediareq *);
static int rl_ioctl(struct ifnet *, u_long, caddr_t);
static void rl_intr(void *);
static void rl_init(void *);
static void rl_init_locked(struct rl_softc *sc);
static void rl_mii_send(struct rl_softc *, uint32_t, int);
static void rl_mii_sync(struct rl_softc *);
static int rl_mii_readreg(struct rl_softc *, struct rl_mii_frame *);
static int rl_mii_writereg(struct rl_softc *, struct rl_mii_frame *);
static int rl_miibus_readreg(device_t, int, int);
static void rl_miibus_statchg(device_t);
static int rl_miibus_writereg(device_t, int, int, int);
#ifdef DEVICE_POLLING
static int rl_poll(struct ifnet *ifp, enum poll_cmd cmd, int count);
static int rl_poll_locked(struct ifnet *ifp, enum poll_cmd cmd, int count);
#endif
static int rl_probe(device_t);
static void rl_read_eeprom(struct rl_softc *, uint8_t *, int, int, int);
static void rl_reset(struct rl_softc *);
static int rl_resume(device_t);
static int rl_rxeof(struct rl_softc *);
static void rl_setmulti(struct rl_softc *);
static int rl_shutdown(device_t);
static void rl_start(struct ifnet *);
static void rl_start_locked(struct ifnet *);
static void rl_stop(struct rl_softc *);
static int rl_suspend(device_t);
static void rl_tick(void *);
static void rl_txeof(struct rl_softc *);
static void rl_watchdog(struct rl_softc *);
#ifdef RL_USEIOSPACE
#define RL_RES SYS_RES_IOPORT
#define RL_RID RL_PCI_LOIO
#else
#define RL_RES SYS_RES_MEMORY
#define RL_RID RL_PCI_LOMEM
#endif
static device_method_t rl_methods[] = {
/* Device interface */
DEVMETHOD(device_probe, rl_probe),
DEVMETHOD(device_attach, rl_attach),
DEVMETHOD(device_detach, rl_detach),
DEVMETHOD(device_suspend, rl_suspend),
DEVMETHOD(device_resume, rl_resume),
DEVMETHOD(device_shutdown, rl_shutdown),
/* bus interface */
DEVMETHOD(bus_print_child, bus_generic_print_child),
DEVMETHOD(bus_driver_added, bus_generic_driver_added),
/* MII interface */
DEVMETHOD(miibus_readreg, rl_miibus_readreg),
DEVMETHOD(miibus_writereg, rl_miibus_writereg),
DEVMETHOD(miibus_statchg, rl_miibus_statchg),
{ 0, 0 }
};
static driver_t rl_driver = {
"rl",
rl_methods,
sizeof(struct rl_softc)
};
static devclass_t rl_devclass;
DRIVER_MODULE(rl, pci, rl_driver, rl_devclass, 0, 0);
DRIVER_MODULE(rl, cardbus, rl_driver, rl_devclass, 0, 0);
DRIVER_MODULE(miibus, rl, miibus_driver, miibus_devclass, 0, 0);
#define EE_SET(x) \
CSR_WRITE_1(sc, RL_EECMD, \
CSR_READ_1(sc, RL_EECMD) | x)
#define EE_CLR(x) \
CSR_WRITE_1(sc, RL_EECMD, \
CSR_READ_1(sc, RL_EECMD) & ~x)
/*
* Send a read command and address to the EEPROM, check for ACK.
*/
static void
rl_eeprom_putbyte(struct rl_softc *sc, int addr)
{
register int d, i;
d = addr | sc->rl_eecmd_read;
/*
* Feed in each bit and strobe the clock.
*/
for (i = 0x400; i; i >>= 1) {
if (d & i) {
EE_SET(RL_EE_DATAIN);
} else {
EE_CLR(RL_EE_DATAIN);
}
DELAY(100);
EE_SET(RL_EE_CLK);
DELAY(150);
EE_CLR(RL_EE_CLK);
DELAY(100);
}
}
/*
* Read a word of data stored in the EEPROM at address 'addr.'
*/
static void
rl_eeprom_getword(struct rl_softc *sc, int addr, uint16_t *dest)
{
register int i;
uint16_t word = 0;
/* Enter EEPROM access mode. */
CSR_WRITE_1(sc, RL_EECMD, RL_EEMODE_PROGRAM|RL_EE_SEL);
/*
* Send address of word we want to read.
*/
rl_eeprom_putbyte(sc, addr);
CSR_WRITE_1(sc, RL_EECMD, RL_EEMODE_PROGRAM|RL_EE_SEL);
/*
* Start reading bits from EEPROM.
*/
for (i = 0x8000; i; i >>= 1) {
EE_SET(RL_EE_CLK);
DELAY(100);
if (CSR_READ_1(sc, RL_EECMD) & RL_EE_DATAOUT)
word |= i;
EE_CLR(RL_EE_CLK);
DELAY(100);
}
/* Turn off EEPROM access mode. */
CSR_WRITE_1(sc, RL_EECMD, RL_EEMODE_OFF);
*dest = word;
}
/*
* Read a sequence of words from the EEPROM.
*/
static void
rl_read_eeprom(struct rl_softc *sc, uint8_t *dest, int off, int cnt, int swap)
{
int i;
uint16_t word = 0, *ptr;
for (i = 0; i < cnt; i++) {
rl_eeprom_getword(sc, off + i, &word);
ptr = (uint16_t *)(dest + (i * 2));
if (swap)
*ptr = ntohs(word);
else
*ptr = word;
}
}
/*
* MII access routines are provided for the 8129, which
* doesn't have a built-in PHY. For the 8139, we fake things
* up by diverting rl_phy_readreg()/rl_phy_writereg() to the
* direct access PHY registers.
*/
#define MII_SET(x) \
CSR_WRITE_1(sc, RL_MII, \
CSR_READ_1(sc, RL_MII) | (x))
#define MII_CLR(x) \
CSR_WRITE_1(sc, RL_MII, \
CSR_READ_1(sc, RL_MII) & ~(x))
/*
* Sync the PHYs by setting data bit and strobing the clock 32 times.
*/
static void
rl_mii_sync(struct rl_softc *sc)
{
register int i;
MII_SET(RL_MII_DIR|RL_MII_DATAOUT);
for (i = 0; i < 32; i++) {
MII_SET(RL_MII_CLK);
DELAY(1);
MII_CLR(RL_MII_CLK);
DELAY(1);
}
}
/*
* Clock a series of bits through the MII.
*/
static void
rl_mii_send(struct rl_softc *sc, uint32_t bits, int cnt)
{
int i;
MII_CLR(RL_MII_CLK);
for (i = (0x1 << (cnt - 1)); i; i >>= 1) {
if (bits & i) {
MII_SET(RL_MII_DATAOUT);
} else {
MII_CLR(RL_MII_DATAOUT);
}
DELAY(1);
MII_CLR(RL_MII_CLK);
DELAY(1);
MII_SET(RL_MII_CLK);
}
}
/*
* Read an PHY register through the MII.
*/
static int
rl_mii_readreg(struct rl_softc *sc, struct rl_mii_frame *frame)
{
int i, ack;
/* Set up frame for RX. */
frame->mii_stdelim = RL_MII_STARTDELIM;
frame->mii_opcode = RL_MII_READOP;
frame->mii_turnaround = 0;
frame->mii_data = 0;
CSR_WRITE_2(sc, RL_MII, 0);
/* Turn on data xmit. */
MII_SET(RL_MII_DIR);
rl_mii_sync(sc);
/* Send command/address info. */
rl_mii_send(sc, frame->mii_stdelim, 2);
rl_mii_send(sc, frame->mii_opcode, 2);
rl_mii_send(sc, frame->mii_phyaddr, 5);
rl_mii_send(sc, frame->mii_regaddr, 5);
/* Idle bit */
MII_CLR((RL_MII_CLK|RL_MII_DATAOUT));
DELAY(1);
MII_SET(RL_MII_CLK);
DELAY(1);
/* Turn off xmit. */
MII_CLR(RL_MII_DIR);
/* Check for ack */
MII_CLR(RL_MII_CLK);
DELAY(1);
ack = CSR_READ_2(sc, RL_MII) & RL_MII_DATAIN;
MII_SET(RL_MII_CLK);
DELAY(1);
/*
* Now try reading data bits. If the ack failed, we still
* need to clock through 16 cycles to keep the PHY(s) in sync.
*/
if (ack) {
for(i = 0; i < 16; i++) {
MII_CLR(RL_MII_CLK);
DELAY(1);
MII_SET(RL_MII_CLK);
DELAY(1);
}
goto fail;
}
for (i = 0x8000; i; i >>= 1) {
MII_CLR(RL_MII_CLK);
DELAY(1);
if (!ack) {
if (CSR_READ_2(sc, RL_MII) & RL_MII_DATAIN)
frame->mii_data |= i;
DELAY(1);
}
MII_SET(RL_MII_CLK);
DELAY(1);
}
fail:
MII_CLR(RL_MII_CLK);
DELAY(1);
MII_SET(RL_MII_CLK);
DELAY(1);
return (ack ? 1 : 0);
}
/*
* Write to a PHY register through the MII.
*/
static int
rl_mii_writereg(struct rl_softc *sc, struct rl_mii_frame *frame)
{
/* Set up frame for TX. */
frame->mii_stdelim = RL_MII_STARTDELIM;
frame->mii_opcode = RL_MII_WRITEOP;
frame->mii_turnaround = RL_MII_TURNAROUND;
/* Turn on data output. */
MII_SET(RL_MII_DIR);
rl_mii_sync(sc);
rl_mii_send(sc, frame->mii_stdelim, 2);
rl_mii_send(sc, frame->mii_opcode, 2);
rl_mii_send(sc, frame->mii_phyaddr, 5);
rl_mii_send(sc, frame->mii_regaddr, 5);
rl_mii_send(sc, frame->mii_turnaround, 2);
rl_mii_send(sc, frame->mii_data, 16);
/* Idle bit. */
MII_SET(RL_MII_CLK);
DELAY(1);
MII_CLR(RL_MII_CLK);
DELAY(1);
/* Turn off xmit. */
MII_CLR(RL_MII_DIR);
return (0);
}
static int
rl_miibus_readreg(device_t dev, int phy, int reg)
{
struct rl_softc *sc;
struct rl_mii_frame frame;
uint16_t rval = 0;
uint16_t rl8139_reg = 0;
sc = device_get_softc(dev);
if (sc->rl_type == RL_8139) {
/* Pretend the internal PHY is only at address 0 */
if (phy) {
return (0);
}
switch (reg) {
case MII_BMCR:
rl8139_reg = RL_BMCR;
break;
case MII_BMSR:
rl8139_reg = RL_BMSR;
break;
case MII_ANAR:
rl8139_reg = RL_ANAR;
break;
case MII_ANER:
rl8139_reg = RL_ANER;
break;
case MII_ANLPAR:
rl8139_reg = RL_LPAR;
break;
case MII_PHYIDR1:
case MII_PHYIDR2:
return (0);
/*
* Allow the rlphy driver to read the media status
* register. If we have a link partner which does not
* support NWAY, this is the register which will tell
* us the results of parallel detection.
*/
case RL_MEDIASTAT:
rval = CSR_READ_1(sc, RL_MEDIASTAT);
return (rval);
default:
device_printf(sc->rl_dev, "bad phy register\n");
return (0);
}
rval = CSR_READ_2(sc, rl8139_reg);
return (rval);
}
bzero((char *)&frame, sizeof(frame));
frame.mii_phyaddr = phy;
frame.mii_regaddr = reg;
rl_mii_readreg(sc, &frame);
return (frame.mii_data);
}
static int
rl_miibus_writereg(device_t dev, int phy, int reg, int data)
{
struct rl_softc *sc;
struct rl_mii_frame frame;
uint16_t rl8139_reg = 0;
sc = device_get_softc(dev);
if (sc->rl_type == RL_8139) {
/* Pretend the internal PHY is only at address 0 */
if (phy) {
return (0);
}
switch (reg) {
case MII_BMCR:
rl8139_reg = RL_BMCR;
break;
case MII_BMSR:
rl8139_reg = RL_BMSR;
break;
case MII_ANAR:
rl8139_reg = RL_ANAR;
break;
case MII_ANER:
rl8139_reg = RL_ANER;
break;
case MII_ANLPAR:
rl8139_reg = RL_LPAR;
break;
case MII_PHYIDR1:
case MII_PHYIDR2:
return (0);
break;
default:
device_printf(sc->rl_dev, "bad phy register\n");
return (0);
}
CSR_WRITE_2(sc, rl8139_reg, data);
return (0);
}
bzero((char *)&frame, sizeof(frame));
frame.mii_phyaddr = phy;
frame.mii_regaddr = reg;
frame.mii_data = data;
rl_mii_writereg(sc, &frame);
return (0);
}
static void
rl_miibus_statchg(device_t dev)
{
struct rl_softc *sc;
struct ifnet *ifp;
struct mii_data *mii;
sc = device_get_softc(dev);
mii = device_get_softc(sc->rl_miibus);
ifp = sc->rl_ifp;
if (mii == NULL || ifp == NULL ||
(ifp->if_drv_flags & IFF_DRV_RUNNING) == 0)
return;
sc->rl_flags &= ~RL_FLAG_LINK;
if ((mii->mii_media_status & (IFM_ACTIVE | IFM_AVALID)) ==
(IFM_ACTIVE | IFM_AVALID)) {
switch (IFM_SUBTYPE(mii->mii_media_active)) {
case IFM_10_T:
case IFM_100_TX:
sc->rl_flags |= RL_FLAG_LINK;
break;
default:
break;
}
}
/*
* RealTek controllers do not provide any interface to
* Tx/Rx MACs for resolved speed, duplex and flow-control
* parameters.
*/
}
/*
* Program the 64-bit multicast hash filter.
*/
static void
rl_setmulti(struct rl_softc *sc)
{
struct ifnet *ifp = sc->rl_ifp;
int h = 0;
uint32_t hashes[2] = { 0, 0 };
struct ifmultiaddr *ifma;
uint32_t rxfilt;
int mcnt = 0;
RL_LOCK_ASSERT(sc);
rxfilt = CSR_READ_4(sc, RL_RXCFG);
if (ifp->if_flags & IFF_ALLMULTI || ifp->if_flags & IFF_PROMISC) {
rxfilt |= RL_RXCFG_RX_MULTI;
CSR_WRITE_4(sc, RL_RXCFG, rxfilt);
CSR_WRITE_4(sc, RL_MAR0, 0xFFFFFFFF);
CSR_WRITE_4(sc, RL_MAR4, 0xFFFFFFFF);
return;
}
/* first, zot all the existing hash bits */
CSR_WRITE_4(sc, RL_MAR0, 0);
CSR_WRITE_4(sc, RL_MAR4, 0);
/* now program new ones */
IF_ADDR_LOCK(ifp);
TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) {
if (ifma->ifma_addr->sa_family != AF_LINK)
continue;
h = ether_crc32_be(LLADDR((struct sockaddr_dl *)
ifma->ifma_addr), ETHER_ADDR_LEN) >> 26;
if (h < 32)
hashes[0] |= (1 << h);
else
hashes[1] |= (1 << (h - 32));
mcnt++;
}
IF_ADDR_UNLOCK(ifp);
if (mcnt)
rxfilt |= RL_RXCFG_RX_MULTI;
else
rxfilt &= ~RL_RXCFG_RX_MULTI;
CSR_WRITE_4(sc, RL_RXCFG, rxfilt);
CSR_WRITE_4(sc, RL_MAR0, hashes[0]);
CSR_WRITE_4(sc, RL_MAR4, hashes[1]);
}
static void
rl_reset(struct rl_softc *sc)
{
register int i;
RL_LOCK_ASSERT(sc);
CSR_WRITE_1(sc, RL_COMMAND, RL_CMD_RESET);
for (i = 0; i < RL_TIMEOUT; i++) {
DELAY(10);
if (!(CSR_READ_1(sc, RL_COMMAND) & RL_CMD_RESET))
break;
}
if (i == RL_TIMEOUT)
device_printf(sc->rl_dev, "reset never completed!\n");
}
/*
* Probe for a RealTek 8129/8139 chip. Check the PCI vendor and device
* IDs against our list and return a device name if we find a match.
*/
static int
rl_probe(device_t dev)
{
struct rl_type *t;
uint16_t devid, revid, vendor;
int i;
vendor = pci_get_vendor(dev);
devid = pci_get_device(dev);
revid = pci_get_revid(dev);
if (vendor == RT_VENDORID && devid == RT_DEVICEID_8139) {
if (revid == 0x20) {
/* 8139C+, let re(4) take care of this device. */
return (ENXIO);
}
}
t = rl_devs;
for (i = 0; i < sizeof(rl_devs) / sizeof(rl_devs[0]); i++, t++) {
if (vendor == t->rl_vid && devid == t->rl_did) {
device_set_desc(dev, t->rl_name);
return (BUS_PROBE_DEFAULT);
}
}
return (ENXIO);
}
struct rl_dmamap_arg {
bus_addr_t rl_busaddr;
};
static void
rl_dmamap_cb(void *arg, bus_dma_segment_t *segs, int nsegs, int error)
{
struct rl_dmamap_arg *ctx;
if (error != 0)
return;
KASSERT(nsegs == 1, ("%s: %d segments returned!", __func__, nsegs));
ctx = (struct rl_dmamap_arg *)arg;
ctx->rl_busaddr = segs[0].ds_addr;
}
/*
* Attach the interface. Allocate softc structures, do ifmedia
* setup and ethernet/BPF attach.
*/
static int
rl_attach(device_t dev)
{
uint8_t eaddr[ETHER_ADDR_LEN];
uint16_t as[3];
struct ifnet *ifp;
struct rl_softc *sc;
struct rl_type *t;
struct sysctl_ctx_list *ctx;
struct sysctl_oid_list *children;
int error = 0, i, rid;
int unit;
uint16_t rl_did = 0;
char tn[32];
sc = device_get_softc(dev);
unit = device_get_unit(dev);
sc->rl_dev = dev;
sc->rl_twister_enable = 0;
snprintf(tn, sizeof(tn), "dev.rl.%d.twister_enable", unit);
TUNABLE_INT_FETCH(tn, &sc->rl_twister_enable);
ctx = device_get_sysctl_ctx(sc->rl_dev);
children = SYSCTL_CHILDREN(device_get_sysctl_tree(sc->rl_dev));
SYSCTL_ADD_INT(ctx, children, OID_AUTO, "twister_enable", CTLFLAG_RD,
&sc->rl_twister_enable, 0, "");
mtx_init(&sc->rl_mtx, device_get_nameunit(dev), MTX_NETWORK_LOCK,
MTX_DEF);
callout_init_mtx(&sc->rl_stat_callout, &sc->rl_mtx, 0);
pci_enable_busmaster(dev);
/* Map control/status registers. */
rid = RL_RID;
sc->rl_res = bus_alloc_resource_any(dev, RL_RES, &rid, RF_ACTIVE);
if (sc->rl_res == NULL) {
device_printf(dev, "couldn't map ports/memory\n");
error = ENXIO;
goto fail;
}
#ifdef notdef
/*
* Detect the Realtek 8139B. For some reason, this chip is very
* unstable when left to autoselect the media
* The best workaround is to set the device to the required
* media type or to set it to the 10 Meg speed.
*/
if ((rman_get_end(sc->rl_res) - rman_get_start(sc->rl_res)) == 0xFF)
device_printf(dev,
"Realtek 8139B detected. Warning, this may be unstable in autoselect mode\n");
#endif
sc->rl_btag = rman_get_bustag(sc->rl_res);
sc->rl_bhandle = rman_get_bushandle(sc->rl_res);
/* Allocate interrupt */
rid = 0;
sc->rl_irq[0] = bus_alloc_resource_any(dev, SYS_RES_IRQ, &rid,
RF_SHAREABLE | RF_ACTIVE);
if (sc->rl_irq[0] == NULL) {
device_printf(dev, "couldn't map interrupt\n");
error = ENXIO;
goto fail;
}
/*
* Reset the adapter. Only take the lock here as it's needed in
* order to call rl_reset().
*/
RL_LOCK(sc);
rl_reset(sc);
RL_UNLOCK(sc);
sc->rl_eecmd_read = RL_EECMD_READ_6BIT;
rl_read_eeprom(sc, (uint8_t *)&rl_did, 0, 1, 0);
if (rl_did != 0x8129)
sc->rl_eecmd_read = RL_EECMD_READ_8BIT;
/*
* Get station address from the EEPROM.
*/
rl_read_eeprom(sc, (uint8_t *)as, RL_EE_EADDR, 3, 0);
for (i = 0; i < 3; i++) {
eaddr[(i * 2) + 0] = as[i] & 0xff;
eaddr[(i * 2) + 1] = as[i] >> 8;
}
/*
* Now read the exact device type from the EEPROM to find
* out if it's an 8129 or 8139.
*/
rl_read_eeprom(sc, (uint8_t *)&rl_did, RL_EE_PCI_DID, 1, 0);
t = rl_devs;
sc->rl_type = 0;
while(t->rl_name != NULL) {
if (rl_did == t->rl_did) {
sc->rl_type = t->rl_basetype;
break;
}
t++;
}
if (sc->rl_type == 0) {
device_printf(dev, "unknown device ID: %x assuming 8139\n",
rl_did);
sc->rl_type = RL_8139;
/*
* Read RL_IDR register to get ethernet address as accessing
* EEPROM may not extract correct address.
*/
for (i = 0; i < ETHER_ADDR_LEN; i++)
eaddr[i] = CSR_READ_1(sc, RL_IDR0 + i);
}
if ((error = rl_dma_alloc(sc)) != 0)
goto fail;
ifp = sc->rl_ifp = if_alloc(IFT_ETHER);
if (ifp == NULL) {
device_printf(dev, "can not if_alloc()\n");
error = ENOSPC;
goto fail;
}
/* Do MII setup */
if (mii_phy_probe(dev, &sc->rl_miibus,
rl_ifmedia_upd, rl_ifmedia_sts)) {
device_printf(dev, "MII without any phy!\n");
error = ENXIO;
goto fail;
}
ifp->if_softc = sc;
if_initname(ifp, device_get_name(dev), device_get_unit(dev));
ifp->if_mtu = ETHERMTU;
ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST;
ifp->if_ioctl = rl_ioctl;
ifp->if_start = rl_start;
ifp->if_init = rl_init;
ifp->if_capabilities = IFCAP_VLAN_MTU;
ifp->if_capenable = ifp->if_capabilities;
#ifdef DEVICE_POLLING
ifp->if_capabilities |= IFCAP_POLLING;
#endif
IFQ_SET_MAXLEN(&ifp->if_snd, IFQ_MAXLEN);
ifp->if_snd.ifq_drv_maxlen = IFQ_MAXLEN;
IFQ_SET_READY(&ifp->if_snd);
/*
* Call MI attach routine.
*/
ether_ifattach(ifp, eaddr);
/* Hook interrupt last to avoid having to lock softc */
error = bus_setup_intr(dev, sc->rl_irq[0], INTR_TYPE_NET | INTR_MPSAFE,
NULL, rl_intr, sc, &sc->rl_intrhand[0]);
if (error) {
device_printf(sc->rl_dev, "couldn't set up irq\n");
ether_ifdetach(ifp);
}
fail:
if (error)
rl_detach(dev);
return (error);
}
/*
* Shutdown hardware and free up resources. This can be called any
* time after the mutex has been initialized. It is called in both
* the error case in attach and the normal detach case so it needs
* to be careful about only freeing resources that have actually been
* allocated.
*/
static int
rl_detach(device_t dev)
{
struct rl_softc *sc;
struct ifnet *ifp;
sc = device_get_softc(dev);
ifp = sc->rl_ifp;
KASSERT(mtx_initialized(&sc->rl_mtx), ("rl mutex not initialized"));
#ifdef DEVICE_POLLING
if (ifp->if_capenable & IFCAP_POLLING)
ether_poll_deregister(ifp);
#endif
/* These should only be active if attach succeeded */
if (device_is_attached(dev)) {
RL_LOCK(sc);
rl_stop(sc);
RL_UNLOCK(sc);
callout_drain(&sc->rl_stat_callout);
ether_ifdetach(ifp);
}
#if 0
sc->suspended = 1;
#endif
if (sc->rl_miibus)
device_delete_child(dev, sc->rl_miibus);
bus_generic_detach(dev);
if (sc->rl_intrhand[0])
bus_teardown_intr(dev, sc->rl_irq[0], sc->rl_intrhand[0]);
if (sc->rl_irq[0])
bus_release_resource(dev, SYS_RES_IRQ, 0, sc->rl_irq[0]);
if (sc->rl_res)
bus_release_resource(dev, RL_RES, RL_RID, sc->rl_res);
if (ifp)
if_free(ifp);
rl_dma_free(sc);
mtx_destroy(&sc->rl_mtx);
return (0);
}
static int
rl_dma_alloc(struct rl_softc *sc)
{
struct rl_dmamap_arg ctx;
int error, i;
/*
* Allocate the parent bus DMA tag appropriate for PCI.
*/
error = bus_dma_tag_create(bus_get_dma_tag(sc->rl_dev), /* parent */
1, 0, /* alignment, boundary */
BUS_SPACE_MAXADDR_32BIT, /* lowaddr */
BUS_SPACE_MAXADDR, /* highaddr */
NULL, NULL, /* filter, filterarg */
BUS_SPACE_MAXSIZE_32BIT, 0, /* maxsize, nsegments */
BUS_SPACE_MAXSIZE_32BIT, /* maxsegsize */
0, /* flags */
NULL, NULL, /* lockfunc, lockarg */
&sc->rl_parent_tag);
if (error) {
device_printf(sc->rl_dev,
"failed to create parent DMA tag.\n");
goto fail;
}
/* Create DMA tag for Rx memory block. */
error = bus_dma_tag_create(sc->rl_parent_tag, /* parent */
RL_RX_8139_BUF_ALIGN, 0, /* alignment, boundary */
BUS_SPACE_MAXADDR, /* lowaddr */
BUS_SPACE_MAXADDR, /* highaddr */
NULL, NULL, /* filter, filterarg */
RL_RXBUFLEN + RL_RX_8139_BUF_GUARD_SZ, 1, /* maxsize,nsegments */
RL_RXBUFLEN + RL_RX_8139_BUF_GUARD_SZ, /* maxsegsize */
0, /* flags */
NULL, NULL, /* lockfunc, lockarg */
&sc->rl_cdata.rl_rx_tag);
if (error) {
device_printf(sc->rl_dev,
"failed to create Rx memory block DMA tag.\n");
goto fail;
}
/* Create DMA tag for Tx buffer. */
error = bus_dma_tag_create(sc->rl_parent_tag, /* parent */
RL_TX_8139_BUF_ALIGN, 0, /* alignment, boundary */
BUS_SPACE_MAXADDR, /* lowaddr */
BUS_SPACE_MAXADDR, /* highaddr */
NULL, NULL, /* filter, filterarg */
MCLBYTES, 1, /* maxsize, nsegments */
MCLBYTES, /* maxsegsize */
0, /* flags */
NULL, NULL, /* lockfunc, lockarg */
&sc->rl_cdata.rl_tx_tag);
if (error) {
device_printf(sc->rl_dev, "failed to create Tx DMA tag.\n");
goto fail;
}
/*
* Allocate DMA'able memory and load DMA map for Rx memory block.
*/
error = bus_dmamem_alloc(sc->rl_cdata.rl_rx_tag,
(void **)&sc->rl_cdata.rl_rx_buf, BUS_DMA_WAITOK |
BUS_DMA_COHERENT | BUS_DMA_ZERO, &sc->rl_cdata.rl_rx_dmamap);
if (error != 0) {
device_printf(sc->rl_dev,
"failed to allocate Rx DMA memory block.\n");
goto fail;
}
ctx.rl_busaddr = 0;
error = bus_dmamap_load(sc->rl_cdata.rl_rx_tag,
sc->rl_cdata.rl_rx_dmamap, sc->rl_cdata.rl_rx_buf,
RL_RXBUFLEN + RL_RX_8139_BUF_GUARD_SZ, rl_dmamap_cb, &ctx,
BUS_DMA_NOWAIT);
if (error != 0 || ctx.rl_busaddr == 0) {
device_printf(sc->rl_dev,
"could not load Rx DMA memory block.\n");
goto fail;
}
sc->rl_cdata.rl_rx_buf_paddr = ctx.rl_busaddr;
/* Create DMA maps for Tx buffers. */
for (i = 0; i < RL_TX_LIST_CNT; i++) {
sc->rl_cdata.rl_tx_chain[i] = NULL;
sc->rl_cdata.rl_tx_dmamap[i] = NULL;
error = bus_dmamap_create(sc->rl_cdata.rl_tx_tag, 0,
&sc->rl_cdata.rl_tx_dmamap[i]);
if (error != 0) {
device_printf(sc->rl_dev,
"could not create Tx dmamap.\n");
goto fail;
}
}
/* Leave a few bytes before the start of the RX ring buffer. */
sc->rl_cdata.rl_rx_buf_ptr = sc->rl_cdata.rl_rx_buf;
sc->rl_cdata.rl_rx_buf += RL_RX_8139_BUF_RESERVE;
fail:
return (error);
}
static void
rl_dma_free(struct rl_softc *sc)
{
int i;
/* Rx memory block. */
if (sc->rl_cdata.rl_rx_tag != NULL) {
if (sc->rl_cdata.rl_rx_dmamap != NULL)
bus_dmamap_unload(sc->rl_cdata.rl_rx_tag,
sc->rl_cdata.rl_rx_dmamap);
if (sc->rl_cdata.rl_rx_dmamap != NULL &&
sc->rl_cdata.rl_rx_buf_ptr != NULL)
bus_dmamem_free(sc->rl_cdata.rl_rx_tag,
sc->rl_cdata.rl_rx_buf_ptr,
sc->rl_cdata.rl_rx_dmamap);
sc->rl_cdata.rl_rx_buf_ptr = NULL;
sc->rl_cdata.rl_rx_buf = NULL;
sc->rl_cdata.rl_rx_dmamap = NULL;
bus_dma_tag_destroy(sc->rl_cdata.rl_rx_tag);
sc->rl_cdata.rl_tx_tag = NULL;
}
/* Tx buffers. */
if (sc->rl_cdata.rl_tx_tag != NULL) {
for (i = 0; i < RL_TX_LIST_CNT; i++) {
if (sc->rl_cdata.rl_tx_dmamap[i] != NULL) {
bus_dmamap_destroy(
sc->rl_cdata.rl_tx_tag,
sc->rl_cdata.rl_tx_dmamap[i]);
sc->rl_cdata.rl_tx_dmamap[i] = NULL;
}
}
bus_dma_tag_destroy(sc->rl_cdata.rl_tx_tag);
sc->rl_cdata.rl_tx_tag = NULL;
}
if (sc->rl_parent_tag != NULL) {
bus_dma_tag_destroy(sc->rl_parent_tag);
sc->rl_parent_tag = NULL;
}
}
/*
* Initialize the transmit descriptors.
*/
static int
rl_list_tx_init(struct rl_softc *sc)
{
struct rl_chain_data *cd;
int i;
RL_LOCK_ASSERT(sc);
cd = &sc->rl_cdata;
for (i = 0; i < RL_TX_LIST_CNT; i++) {
cd->rl_tx_chain[i] = NULL;
CSR_WRITE_4(sc,
RL_TXADDR0 + (i * sizeof(uint32_t)), 0x0000000);
}
sc->rl_cdata.cur_tx = 0;
sc->rl_cdata.last_tx = 0;
return (0);
}
static int
rl_list_rx_init(struct rl_softc *sc)
{
RL_LOCK_ASSERT(sc);
bzero(sc->rl_cdata.rl_rx_buf_ptr,
RL_RXBUFLEN + RL_RX_8139_BUF_GUARD_SZ);
bus_dmamap_sync(sc->rl_cdata.rl_tx_tag, sc->rl_cdata.rl_rx_dmamap,
BUS_DMASYNC_PREREAD | BUS_DMASYNC_PREWRITE);
return (0);
}
/*
* A frame has been uploaded: pass the resulting mbuf chain up to
* the higher level protocols.
*
* You know there's something wrong with a PCI bus-master chip design
* when you have to use m_devget().
*
* The receive operation is badly documented in the datasheet, so I'll
* attempt to document it here. The driver provides a buffer area and
* places its base address in the RX buffer start address register.
* The chip then begins copying frames into the RX buffer. Each frame
* is preceded by a 32-bit RX status word which specifies the length
* of the frame and certain other status bits. Each frame (starting with
* the status word) is also 32-bit aligned. The frame length is in the
* first 16 bits of the status word; the lower 15 bits correspond with
* the 'rx status register' mentioned in the datasheet.
*
* Note: to make the Alpha happy, the frame payload needs to be aligned
* on a 32-bit boundary. To achieve this, we pass RL_ETHER_ALIGN (2 bytes)
* as the offset argument to m_devget().
*/
static int
rl_rxeof(struct rl_softc *sc)
{
struct mbuf *m;
struct ifnet *ifp = sc->rl_ifp;
uint8_t *rxbufpos;
int total_len = 0;
int wrap = 0;
int rx_npkts = 0;
uint32_t rxstat;
uint16_t cur_rx;
uint16_t limit;
uint16_t max_bytes, rx_bytes = 0;
RL_LOCK_ASSERT(sc);
bus_dmamap_sync(sc->rl_cdata.rl_rx_tag, sc->rl_cdata.rl_rx_dmamap,
BUS_DMASYNC_POSTREAD | BUS_DMASYNC_POSTWRITE);
cur_rx = (CSR_READ_2(sc, RL_CURRXADDR) + 16) % RL_RXBUFLEN;
/* Do not try to read past this point. */
limit = CSR_READ_2(sc, RL_CURRXBUF) % RL_RXBUFLEN;
if (limit < cur_rx)
max_bytes = (RL_RXBUFLEN - cur_rx) + limit;
else
max_bytes = limit - cur_rx;
while((CSR_READ_1(sc, RL_COMMAND) & RL_CMD_EMPTY_RXBUF) == 0) {
#ifdef DEVICE_POLLING
if (ifp->if_capenable & IFCAP_POLLING) {
if (sc->rxcycles <= 0)
break;
sc->rxcycles--;
}
#endif
rxbufpos = sc->rl_cdata.rl_rx_buf + cur_rx;
rxstat = le32toh(*(uint32_t *)rxbufpos);
/*
* Here's a totally undocumented fact for you. When the
* RealTek chip is in the process of copying a packet into
* RAM for you, the length will be 0xfff0. If you spot a
* packet header with this value, you need to stop. The
* datasheet makes absolutely no mention of this and
* RealTek should be shot for this.
*/
total_len = rxstat >> 16;
if (total_len == RL_RXSTAT_UNFINISHED)
break;
if (!(rxstat & RL_RXSTAT_RXOK) ||
total_len < ETHER_MIN_LEN ||
total_len > ETHER_MAX_LEN + ETHER_VLAN_ENCAP_LEN) {
ifp->if_ierrors++;
rl_init_locked(sc);
return (rx_npkts);
}
/* No errors; receive the packet. */
rx_bytes += total_len + 4;
/*
* XXX The RealTek chip includes the CRC with every
* received frame, and there's no way to turn this
* behavior off (at least, I can't find anything in
* the manual that explains how to do it) so we have
* to trim off the CRC manually.
*/
total_len -= ETHER_CRC_LEN;
/*
* Avoid trying to read more bytes than we know
* the chip has prepared for us.
*/
if (rx_bytes > max_bytes)
break;
rxbufpos = sc->rl_cdata.rl_rx_buf +
((cur_rx + sizeof(uint32_t)) % RL_RXBUFLEN);
if (rxbufpos == (sc->rl_cdata.rl_rx_buf + RL_RXBUFLEN))
rxbufpos = sc->rl_cdata.rl_rx_buf;
wrap = (sc->rl_cdata.rl_rx_buf + RL_RXBUFLEN) - rxbufpos;
if (total_len > wrap) {
m = m_devget(rxbufpos, total_len, RL_ETHER_ALIGN, ifp,
NULL);
if (m != NULL)
m_copyback(m, wrap, total_len - wrap,
sc->rl_cdata.rl_rx_buf);
cur_rx = (total_len - wrap + ETHER_CRC_LEN);
} else {
m = m_devget(rxbufpos, total_len, RL_ETHER_ALIGN, ifp,
NULL);
cur_rx += total_len + 4 + ETHER_CRC_LEN;
}
/* Round up to 32-bit boundary. */
cur_rx = (cur_rx + 3) & ~3;
CSR_WRITE_2(sc, RL_CURRXADDR, cur_rx - 16);
if (m == NULL) {
ifp->if_iqdrops++;
continue;
}
ifp->if_ipackets++;
RL_UNLOCK(sc);
(*ifp->if_input)(ifp, m);
RL_LOCK(sc);
rx_npkts++;
}
/* No need to sync Rx memory block as we didn't modify it. */
return (rx_npkts);
}
/*
* A frame was downloaded to the chip. It's safe for us to clean up
* the list buffers.
*/
static void
rl_txeof(struct rl_softc *sc)
{
struct ifnet *ifp = sc->rl_ifp;
uint32_t txstat;
RL_LOCK_ASSERT(sc);
/*
* Go through our tx list and free mbufs for those
* frames that have been uploaded.
*/
do {
if (RL_LAST_TXMBUF(sc) == NULL)
break;
txstat = CSR_READ_4(sc, RL_LAST_TXSTAT(sc));
if (!(txstat & (RL_TXSTAT_TX_OK|
RL_TXSTAT_TX_UNDERRUN|RL_TXSTAT_TXABRT)))
break;
ifp->if_collisions += (txstat & RL_TXSTAT_COLLCNT) >> 24;
bus_dmamap_sync(sc->rl_cdata.rl_tx_tag, RL_LAST_DMAMAP(sc),
BUS_DMASYNC_POSTWRITE);
bus_dmamap_unload(sc->rl_cdata.rl_tx_tag, RL_LAST_DMAMAP(sc));
m_freem(RL_LAST_TXMBUF(sc));
RL_LAST_TXMBUF(sc) = NULL;
/*
* If there was a transmit underrun, bump the TX threshold.
* Make sure not to overflow the 63 * 32byte we can address
* with the 6 available bit.
*/
if ((txstat & RL_TXSTAT_TX_UNDERRUN) &&
(sc->rl_txthresh < 2016))
sc->rl_txthresh += 32;
if (txstat & RL_TXSTAT_TX_OK)
ifp->if_opackets++;
else {
int oldthresh;
ifp->if_oerrors++;
if ((txstat & RL_TXSTAT_TXABRT) ||
(txstat & RL_TXSTAT_OUTOFWIN))
CSR_WRITE_4(sc, RL_TXCFG, RL_TXCFG_CONFIG);
oldthresh = sc->rl_txthresh;
/* error recovery */
rl_init_locked(sc);
/* restore original threshold */
sc->rl_txthresh = oldthresh;
return;
}
RL_INC(sc->rl_cdata.last_tx);
ifp->if_drv_flags &= ~IFF_DRV_OACTIVE;
} while (sc->rl_cdata.last_tx != sc->rl_cdata.cur_tx);
if (RL_LAST_TXMBUF(sc) == NULL)
sc->rl_watchdog_timer = 0;
}
static void
rl_twister_update(struct rl_softc *sc)
{
uint16_t linktest;
/*
* Table provided by RealTek (Kinston <shangh@realtek.com.tw>) for
* Linux driver. Values undocumented otherwise.
*/
static const uint32_t param[4][4] = {
{0xcb39de43, 0xcb39ce43, 0xfb38de03, 0xcb38de43},
{0xcb39de43, 0xcb39ce43, 0xcb39ce83, 0xcb39ce83},
{0xcb39de43, 0xcb39ce43, 0xcb39ce83, 0xcb39ce83},
{0xbb39de43, 0xbb39ce43, 0xbb39ce83, 0xbb39ce83}
};
/*
* Tune the so-called twister registers of the RTL8139. These
* are used to compensate for impedance mismatches. The
* method for tuning these registers is undocumented and the
* following procedure is collected from public sources.
*/
switch (sc->rl_twister)
{
case CHK_LINK:
/*
* If we have a sufficient link, then we can proceed in
* the state machine to the next stage. If not, then
* disable further tuning after writing sane defaults.
*/
if (CSR_READ_2(sc, RL_CSCFG) & RL_CSCFG_LINK_OK) {
CSR_WRITE_2(sc, RL_CSCFG, RL_CSCFG_LINK_DOWN_OFF_CMD);
sc->rl_twister = FIND_ROW;
} else {
CSR_WRITE_2(sc, RL_CSCFG, RL_CSCFG_LINK_DOWN_CMD);
CSR_WRITE_4(sc, RL_NWAYTST, RL_NWAYTST_CBL_TEST);
CSR_WRITE_4(sc, RL_PARA78, RL_PARA78_DEF);
CSR_WRITE_4(sc, RL_PARA7C, RL_PARA7C_DEF);
sc->rl_twister = DONE;
}
break;
case FIND_ROW:
/*
* Read how long it took to see the echo to find the tuning
* row to use.
*/
linktest = CSR_READ_2(sc, RL_CSCFG) & RL_CSCFG_STATUS;
if (linktest == RL_CSCFG_ROW3)
sc->rl_twist_row = 3;
else if (linktest == RL_CSCFG_ROW2)
sc->rl_twist_row = 2;
else if (linktest == RL_CSCFG_ROW1)
sc->rl_twist_row = 1;
else
sc->rl_twist_row = 0;
sc->rl_twist_col = 0;
sc->rl_twister = SET_PARAM;
break;
case SET_PARAM:
if (sc->rl_twist_col == 0)
CSR_WRITE_4(sc, RL_NWAYTST, RL_NWAYTST_RESET);
CSR_WRITE_4(sc, RL_PARA7C,
param[sc->rl_twist_row][sc->rl_twist_col]);
if (++sc->rl_twist_col == 4) {
if (sc->rl_twist_row == 3)
sc->rl_twister = RECHK_LONG;
else
sc->rl_twister = DONE;
}
break;
case RECHK_LONG:
/*
* For long cables, we have to double check to make sure we
* don't mistune.
*/
linktest = CSR_READ_2(sc, RL_CSCFG) & RL_CSCFG_STATUS;
if (linktest == RL_CSCFG_ROW3)
sc->rl_twister = DONE;
else {
CSR_WRITE_4(sc, RL_PARA7C, RL_PARA7C_RETUNE);
sc->rl_twister = RETUNE;
}
break;
case RETUNE:
/* Retune for a shorter cable (try column 2) */
CSR_WRITE_4(sc, RL_NWAYTST, RL_NWAYTST_CBL_TEST);
CSR_WRITE_4(sc, RL_PARA78, RL_PARA78_DEF);
CSR_WRITE_4(sc, RL_PARA7C, RL_PARA7C_DEF);
CSR_WRITE_4(sc, RL_NWAYTST, RL_NWAYTST_RESET);
sc->rl_twist_row--;
sc->rl_twist_col = 0;
sc->rl_twister = SET_PARAM;
break;
case DONE:
break;
}
}
static void
rl_tick(void *xsc)
{
struct rl_softc *sc = xsc;
struct mii_data *mii;
int ticks;
RL_LOCK_ASSERT(sc);
/*
* If we're doing the twister cable calibration, then we need to defer
* watchdog timeouts. This is a no-op in normal operations, but
* can falsely trigger when the cable calibration takes a while and
* there was traffic ready to go when rl was started.
*
* We don't defer mii_tick since that updates the mii status, which
* helps the twister process, at least according to similar patches
* for the Linux driver I found online while doing the fixes. Worst
* case is a few extra mii reads during calibration.
*/
mii = device_get_softc(sc->rl_miibus);
mii_tick(mii);
if ((sc->rl_flags & RL_FLAG_LINK) == 0)
rl_miibus_statchg(sc->rl_dev);
if (sc->rl_twister_enable) {
if (sc->rl_twister == DONE)
rl_watchdog(sc);
else
rl_twister_update(sc);
if (sc->rl_twister == DONE)
ticks = hz;
else
ticks = hz / 10;
} else {
rl_watchdog(sc);
ticks = hz;
}
callout_reset(&sc->rl_stat_callout, ticks, rl_tick, sc);
}
#ifdef DEVICE_POLLING
static int
rl_poll(struct ifnet *ifp, enum poll_cmd cmd, int count)
{
struct rl_softc *sc = ifp->if_softc;
int rx_npkts = 0;
RL_LOCK(sc);
if (ifp->if_drv_flags & IFF_DRV_RUNNING)
rx_npkts = rl_poll_locked(ifp, cmd, count);
RL_UNLOCK(sc);
return (rx_npkts);
}
static int
rl_poll_locked(struct ifnet *ifp, enum poll_cmd cmd, int count)
{
struct rl_softc *sc = ifp->if_softc;
int rx_npkts;
RL_LOCK_ASSERT(sc);
sc->rxcycles = count;
rx_npkts = rl_rxeof(sc);
rl_txeof(sc);
if (!IFQ_DRV_IS_EMPTY(&ifp->if_snd))
rl_start_locked(ifp);
if (cmd == POLL_AND_CHECK_STATUS) {
uint16_t status;
/* We should also check the status register. */
status = CSR_READ_2(sc, RL_ISR);
if (status == 0xffff)
return (rx_npkts);
if (status != 0)
CSR_WRITE_2(sc, RL_ISR, status);
/* XXX We should check behaviour on receiver stalls. */
if (status & RL_ISR_SYSTEM_ERR)
rl_init_locked(sc);
}
return (rx_npkts);
}
#endif /* DEVICE_POLLING */
static void
rl_intr(void *arg)
{
struct rl_softc *sc = arg;
struct ifnet *ifp = sc->rl_ifp;
uint16_t status;
RL_LOCK(sc);
if (sc->suspended)
goto done_locked;
#ifdef DEVICE_POLLING
if (ifp->if_capenable & IFCAP_POLLING)
goto done_locked;
#endif
for (;;) {
status = CSR_READ_2(sc, RL_ISR);
/* If the card has gone away, the read returns 0xffff. */
if (status == 0xffff)
break;
if (status != 0)
CSR_WRITE_2(sc, RL_ISR, status);
if ((status & RL_INTRS) == 0)
break;
if (status & RL_ISR_RX_OK)
rl_rxeof(sc);
if (status & RL_ISR_RX_ERR)
rl_rxeof(sc);
if ((status & RL_ISR_TX_OK) || (status & RL_ISR_TX_ERR))
rl_txeof(sc);
if (status & RL_ISR_SYSTEM_ERR)
rl_init_locked(sc);
}
if (!IFQ_DRV_IS_EMPTY(&ifp->if_snd))
rl_start_locked(ifp);
done_locked:
RL_UNLOCK(sc);
}
/*
* Encapsulate an mbuf chain in a descriptor by coupling the mbuf data
* pointers to the fragment pointers.
*/
static int
rl_encap(struct rl_softc *sc, struct mbuf **m_head)
{
struct mbuf *m;
bus_dma_segment_t txsegs[1];
int error, nsegs, padlen;
RL_LOCK_ASSERT(sc);
m = *m_head;
padlen = 0;
/*
* Hardware doesn't auto-pad, so we have to make sure
* pad short frames out to the minimum frame length.
*/
if (m->m_pkthdr.len < RL_MIN_FRAMELEN)
padlen = RL_MIN_FRAMELEN - m->m_pkthdr.len;
/*
* The RealTek is brain damaged and wants longword-aligned
* TX buffers, plus we can only have one fragment buffer
* per packet. We have to copy pretty much all the time.
*/
if (m->m_next != NULL || (mtod(m, uintptr_t) & 3) != 0 ||
(padlen > 0 && M_TRAILINGSPACE(m) < padlen)) {
m = m_defrag(*m_head, M_DONTWAIT);
if (m == NULL) {
m_freem(*m_head);
*m_head = NULL;
return (ENOMEM);
}
}
*m_head = m;
if (padlen > 0) {
/*
* Make security-conscious people happy: zero out the
* bytes in the pad area, since we don't know what
* this mbuf cluster buffer's previous user might
* have left in it.
*/
bzero(mtod(m, char *) + m->m_pkthdr.len, padlen);
m->m_pkthdr.len += padlen;
m->m_len = m->m_pkthdr.len;
}
error = bus_dmamap_load_mbuf_sg(sc->rl_cdata.rl_tx_tag,
RL_CUR_DMAMAP(sc), m, txsegs, &nsegs, 0);
if (error != 0)
return (error);
if (nsegs == 0) {
m_freem(*m_head);
*m_head = NULL;
return (EIO);
}
RL_CUR_TXMBUF(sc) = m;
bus_dmamap_sync(sc->rl_cdata.rl_tx_tag, RL_CUR_DMAMAP(sc),
BUS_DMASYNC_PREWRITE);
CSR_WRITE_4(sc, RL_CUR_TXADDR(sc), RL_ADDR_LO(txsegs[0].ds_addr));
return (0);
}
/*
* Main transmit routine.
*/
static void
rl_start(struct ifnet *ifp)
{
struct rl_softc *sc = ifp->if_softc;
RL_LOCK(sc);
rl_start_locked(ifp);
RL_UNLOCK(sc);
}
static void
rl_start_locked(struct ifnet *ifp)
{
struct rl_softc *sc = ifp->if_softc;
struct mbuf *m_head = NULL;
RL_LOCK_ASSERT(sc);
if ((ifp->if_drv_flags & (IFF_DRV_RUNNING | IFF_DRV_OACTIVE)) !=
IFF_DRV_RUNNING || (sc->rl_flags & RL_FLAG_LINK) == 0)
return;
while (RL_CUR_TXMBUF(sc) == NULL) {
IFQ_DRV_DEQUEUE(&ifp->if_snd, m_head);
if (m_head == NULL)
break;
if (rl_encap(sc, &m_head)) {
if (m_head == NULL)
break;
IFQ_DRV_PREPEND(&ifp->if_snd, m_head);
ifp->if_drv_flags |= IFF_DRV_OACTIVE;
break;
}
/* Pass a copy of this mbuf chain to the bpf subsystem. */
BPF_MTAP(ifp, RL_CUR_TXMBUF(sc));
/* Transmit the frame. */
CSR_WRITE_4(sc, RL_CUR_TXSTAT(sc),
RL_TXTHRESH(sc->rl_txthresh) |
RL_CUR_TXMBUF(sc)->m_pkthdr.len);
RL_INC(sc->rl_cdata.cur_tx);
/* Set a timeout in case the chip goes out to lunch. */
sc->rl_watchdog_timer = 5;
}
/*
* We broke out of the loop because all our TX slots are
* full. Mark the NIC as busy until it drains some of the
* packets from the queue.
*/
if (RL_CUR_TXMBUF(sc) != NULL)
ifp->if_drv_flags |= IFF_DRV_OACTIVE;
}
static void
rl_init(void *xsc)
{
struct rl_softc *sc = xsc;
RL_LOCK(sc);
rl_init_locked(sc);
RL_UNLOCK(sc);
}
static void
rl_init_locked(struct rl_softc *sc)
{
struct ifnet *ifp = sc->rl_ifp;
struct mii_data *mii;
uint32_t rxcfg = 0;
uint32_t eaddr[2];
RL_LOCK_ASSERT(sc);
mii = device_get_softc(sc->rl_miibus);
/*
* Cancel pending I/O and free all RX/TX buffers.
*/
rl_stop(sc);
rl_reset(sc);
if (sc->rl_twister_enable) {
/*
* Reset twister register tuning state. The twister
* registers and their tuning are undocumented, but
* are necessary to cope with bad links. rl_twister =
* DONE here will disable this entirely.
*/
sc->rl_twister = CHK_LINK;
}
/*
* Init our MAC address. Even though the chipset
* documentation doesn't mention it, we need to enter "Config
* register write enable" mode to modify the ID registers.
*/
CSR_WRITE_1(sc, RL_EECMD, RL_EEMODE_WRITECFG);
bzero(eaddr, sizeof(eaddr));
bcopy(IF_LLADDR(sc->rl_ifp), eaddr, ETHER_ADDR_LEN);
CSR_WRITE_STREAM_4(sc, RL_IDR0, eaddr[0]);
CSR_WRITE_STREAM_4(sc, RL_IDR4, eaddr[1]);
CSR_WRITE_1(sc, RL_EECMD, RL_EEMODE_OFF);
/* Init the RX memory block pointer register. */
CSR_WRITE_4(sc, RL_RXADDR, sc->rl_cdata.rl_rx_buf_paddr +
RL_RX_8139_BUF_RESERVE);
/* Init TX descriptors. */
rl_list_tx_init(sc);
/* Init Rx memory block. */
rl_list_rx_init(sc);
/*
* Enable transmit and receive.
*/
CSR_WRITE_1(sc, RL_COMMAND, RL_CMD_TX_ENB|RL_CMD_RX_ENB);
/*
* Set the initial TX and RX configuration.
*/
CSR_WRITE_4(sc, RL_TXCFG, RL_TXCFG_CONFIG);
CSR_WRITE_4(sc, RL_RXCFG, RL_RXCFG_CONFIG);
/* Set the individual bit to receive frames for this host only. */
rxcfg = CSR_READ_4(sc, RL_RXCFG);
rxcfg |= RL_RXCFG_RX_INDIV;
/* If we want promiscuous mode, set the allframes bit. */
if (ifp->if_flags & IFF_PROMISC) {
rxcfg |= RL_RXCFG_RX_ALLPHYS;
CSR_WRITE_4(sc, RL_RXCFG, rxcfg);
} else {
rxcfg &= ~RL_RXCFG_RX_ALLPHYS;
CSR_WRITE_4(sc, RL_RXCFG, rxcfg);
}
/* Set capture broadcast bit to capture broadcast frames. */
if (ifp->if_flags & IFF_BROADCAST) {
rxcfg |= RL_RXCFG_RX_BROAD;
CSR_WRITE_4(sc, RL_RXCFG, rxcfg);
} else {
rxcfg &= ~RL_RXCFG_RX_BROAD;
CSR_WRITE_4(sc, RL_RXCFG, rxcfg);
}
/* Program the multicast filter, if necessary. */
rl_setmulti(sc);
#ifdef DEVICE_POLLING
/* Disable interrupts if we are polling. */
if (ifp->if_capenable & IFCAP_POLLING)
CSR_WRITE_2(sc, RL_IMR, 0);
else
#endif
/* Enable interrupts. */
CSR_WRITE_2(sc, RL_IMR, RL_INTRS);
/* Set initial TX threshold */
sc->rl_txthresh = RL_TX_THRESH_INIT;
/* Start RX/TX process. */
CSR_WRITE_4(sc, RL_MISSEDPKT, 0);
/* Enable receiver and transmitter. */
CSR_WRITE_1(sc, RL_COMMAND, RL_CMD_TX_ENB|RL_CMD_RX_ENB);
sc->rl_flags &= ~RL_FLAG_LINK;
mii_mediachg(mii);
CSR_WRITE_1(sc, RL_CFG1, RL_CFG1_DRVLOAD|RL_CFG1_FULLDUPLEX);
ifp->if_drv_flags |= IFF_DRV_RUNNING;
ifp->if_drv_flags &= ~IFF_DRV_OACTIVE;
callout_reset(&sc->rl_stat_callout, hz, rl_tick, sc);
}
/*
* Set media options.
*/
static int
rl_ifmedia_upd(struct ifnet *ifp)
{
struct rl_softc *sc = ifp->if_softc;
struct mii_data *mii;
mii = device_get_softc(sc->rl_miibus);
RL_LOCK(sc);
mii_mediachg(mii);
RL_UNLOCK(sc);
return (0);
}
/*
* Report current media status.
*/
static void
rl_ifmedia_sts(struct ifnet *ifp, struct ifmediareq *ifmr)
{
struct rl_softc *sc = ifp->if_softc;
struct mii_data *mii;
mii = device_get_softc(sc->rl_miibus);
RL_LOCK(sc);
mii_pollstat(mii);
RL_UNLOCK(sc);
ifmr->ifm_active = mii->mii_media_active;
ifmr->ifm_status = mii->mii_media_status;
}
static int
rl_ioctl(struct ifnet *ifp, u_long command, caddr_t data)
{
struct ifreq *ifr = (struct ifreq *)data;
struct mii_data *mii;
struct rl_softc *sc = ifp->if_softc;
int error = 0;
switch (command) {
case SIOCSIFFLAGS:
RL_LOCK(sc);
if (ifp->if_flags & IFF_UP) {
rl_init_locked(sc);
} else {
if (ifp->if_drv_flags & IFF_DRV_RUNNING)
rl_stop(sc);
}
RL_UNLOCK(sc);
error = 0;
break;
case SIOCADDMULTI:
case SIOCDELMULTI:
RL_LOCK(sc);
rl_setmulti(sc);
RL_UNLOCK(sc);
error = 0;
break;
case SIOCGIFMEDIA:
case SIOCSIFMEDIA:
mii = device_get_softc(sc->rl_miibus);
error = ifmedia_ioctl(ifp, ifr, &mii->mii_media, command);
break;
case SIOCSIFCAP:
#ifdef DEVICE_POLLING
if (ifr->ifr_reqcap & IFCAP_POLLING &&
!(ifp->if_capenable & IFCAP_POLLING)) {
error = ether_poll_register(rl_poll, ifp);
if (error)
return(error);
RL_LOCK(sc);
/* Disable interrupts */
CSR_WRITE_2(sc, RL_IMR, 0x0000);
ifp->if_capenable |= IFCAP_POLLING;
RL_UNLOCK(sc);
return (error);
}
if (!(ifr->ifr_reqcap & IFCAP_POLLING) &&
ifp->if_capenable & IFCAP_POLLING) {
error = ether_poll_deregister(ifp);
/* Enable interrupts. */
RL_LOCK(sc);
CSR_WRITE_2(sc, RL_IMR, RL_INTRS);
ifp->if_capenable &= ~IFCAP_POLLING;
RL_UNLOCK(sc);
return (error);
}
#endif /* DEVICE_POLLING */
break;
default:
error = ether_ioctl(ifp, command, data);
break;
}
return (error);
}
static void
rl_watchdog(struct rl_softc *sc)
{
RL_LOCK_ASSERT(sc);
if (sc->rl_watchdog_timer == 0 || --sc->rl_watchdog_timer >0)
return;
device_printf(sc->rl_dev, "watchdog timeout\n");
sc->rl_ifp->if_oerrors++;
rl_txeof(sc);
rl_rxeof(sc);
rl_init_locked(sc);
}
/*
* Stop the adapter and free any mbufs allocated to the
* RX and TX lists.
*/
static void
rl_stop(struct rl_softc *sc)
{
register int i;
struct ifnet *ifp = sc->rl_ifp;
RL_LOCK_ASSERT(sc);
sc->rl_watchdog_timer = 0;
callout_stop(&sc->rl_stat_callout);
ifp->if_drv_flags &= ~(IFF_DRV_RUNNING | IFF_DRV_OACTIVE);
sc->rl_flags &= ~RL_FLAG_LINK;
CSR_WRITE_1(sc, RL_COMMAND, 0x00);
CSR_WRITE_2(sc, RL_IMR, 0x0000);
for (i = 0; i < RL_TIMEOUT; i++) {
DELAY(10);
if ((CSR_READ_1(sc, RL_COMMAND) &
(RL_CMD_RX_ENB | RL_CMD_TX_ENB)) == 0)
break;
}
if (i == RL_TIMEOUT)
device_printf(sc->rl_dev, "Unable to stop Tx/Rx MAC\n");
/*
* Free the TX list buffers.
*/
for (i = 0; i < RL_TX_LIST_CNT; i++) {
if (sc->rl_cdata.rl_tx_chain[i] != NULL) {
if (sc->rl_cdata.rl_tx_chain[i] != NULL) {
bus_dmamap_sync(sc->rl_cdata.rl_tx_tag,
sc->rl_cdata.rl_tx_dmamap[i],
BUS_DMASYNC_POSTWRITE);
bus_dmamap_unload(sc->rl_cdata.rl_tx_tag,
sc->rl_cdata.rl_tx_dmamap[i]);
m_freem(sc->rl_cdata.rl_tx_chain[i]);
sc->rl_cdata.rl_tx_chain[i] = NULL;
}
CSR_WRITE_4(sc, RL_TXADDR0 + (i * sizeof(uint32_t)),
0x0000000);
}
}
}
/*
* Device suspend routine. Stop the interface and save some PCI
* settings in case the BIOS doesn't restore them properly on
* resume.
*/
static int
rl_suspend(device_t dev)
{
struct rl_softc *sc;
sc = device_get_softc(dev);
RL_LOCK(sc);
rl_stop(sc);
sc->suspended = 1;
RL_UNLOCK(sc);
return (0);
}
/*
* Device resume routine. Restore some PCI settings in case the BIOS
* doesn't, re-enable busmastering, and restart the interface if
* appropriate.
*/
static int
rl_resume(device_t dev)
{
struct rl_softc *sc;
struct ifnet *ifp;
sc = device_get_softc(dev);
ifp = sc->rl_ifp;
RL_LOCK(sc);
/* reinitialize interface if necessary */
if (ifp->if_flags & IFF_UP)
rl_init_locked(sc);
sc->suspended = 0;
RL_UNLOCK(sc);
return (0);
}
/*
* Stop all chip I/O so that the kernel's probe routines don't
* get confused by errant DMAs when rebooting.
*/
static int
rl_shutdown(device_t dev)
{
struct rl_softc *sc;
sc = device_get_softc(dev);
RL_LOCK(sc);
rl_stop(sc);
RL_UNLOCK(sc);
return (0);
}
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