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qemu/hw/cadence_gem.c
Jim Meyering 5fbe02e8bb cadence_gem: avoid stack-writing buffer-overrun 
Use sizeof(rxbuf)-size (not sizeof(rxbuf-size)) as the number
of bytes to clear.  The latter would always clear 4 or 8
bytes, possibly writing beyond the end of that stack buffer.
Alternatively, depending on the value of the "size" parameter,
it could fail to initialize the end of "rxbuf".
Spotted by coverity.

Signed-off-by: Jim Meyering <meyering@redhat.com>
Reviewed-by: Peter A.G. Crosthwaite <peter.crosthwaite@petalogix.com>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
2012-06-19 13:24:44 +00:00

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/*
* QEMU Xilinx GEM emulation
*
* Copyright (c) 2011 Xilinx, Inc.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include <zlib.h> /* For crc32 */
#include "sysbus.h"
#include "net.h"
#include "net/checksum.h"
#ifdef CADENCE_GEM_ERR_DEBUG
#define DB_PRINT(...) do { \
fprintf(stderr, ": %s: ", __func__); \
fprintf(stderr, ## __VA_ARGS__); \
} while (0);
#else
#define DB_PRINT(...)
#endif
#define GEM_NWCTRL (0x00000000/4) /* Network Control reg */
#define GEM_NWCFG (0x00000004/4) /* Network Config reg */
#define GEM_NWSTATUS (0x00000008/4) /* Network Status reg */
#define GEM_USERIO (0x0000000C/4) /* User IO reg */
#define GEM_DMACFG (0x00000010/4) /* DMA Control reg */
#define GEM_TXSTATUS (0x00000014/4) /* TX Status reg */
#define GEM_RXQBASE (0x00000018/4) /* RX Q Base address reg */
#define GEM_TXQBASE (0x0000001C/4) /* TX Q Base address reg */
#define GEM_RXSTATUS (0x00000020/4) /* RX Status reg */
#define GEM_ISR (0x00000024/4) /* Interrupt Status reg */
#define GEM_IER (0x00000028/4) /* Interrupt Enable reg */
#define GEM_IDR (0x0000002C/4) /* Interrupt Disable reg */
#define GEM_IMR (0x00000030/4) /* Interrupt Mask reg */
#define GEM_PHYMNTNC (0x00000034/4) /* Phy Maintaince reg */
#define GEM_RXPAUSE (0x00000038/4) /* RX Pause Time reg */
#define GEM_TXPAUSE (0x0000003C/4) /* TX Pause Time reg */
#define GEM_TXPARTIALSF (0x00000040/4) /* TX Partial Store and Forward */
#define GEM_RXPARTIALSF (0x00000044/4) /* RX Partial Store and Forward */
#define GEM_HASHLO (0x00000080/4) /* Hash Low address reg */
#define GEM_HASHHI (0x00000084/4) /* Hash High address reg */
#define GEM_SPADDR1LO (0x00000088/4) /* Specific addr 1 low reg */
#define GEM_SPADDR1HI (0x0000008C/4) /* Specific addr 1 high reg */
#define GEM_SPADDR2LO (0x00000090/4) /* Specific addr 2 low reg */
#define GEM_SPADDR2HI (0x00000094/4) /* Specific addr 2 high reg */
#define GEM_SPADDR3LO (0x00000098/4) /* Specific addr 3 low reg */
#define GEM_SPADDR3HI (0x0000009C/4) /* Specific addr 3 high reg */
#define GEM_SPADDR4LO (0x000000A0/4) /* Specific addr 4 low reg */
#define GEM_SPADDR4HI (0x000000A4/4) /* Specific addr 4 high reg */
#define GEM_TIDMATCH1 (0x000000A8/4) /* Type ID1 Match reg */
#define GEM_TIDMATCH2 (0x000000AC/4) /* Type ID2 Match reg */
#define GEM_TIDMATCH3 (0x000000B0/4) /* Type ID3 Match reg */
#define GEM_TIDMATCH4 (0x000000B4/4) /* Type ID4 Match reg */
#define GEM_WOLAN (0x000000B8/4) /* Wake on LAN reg */
#define GEM_IPGSTRETCH (0x000000BC/4) /* IPG Stretch reg */
#define GEM_SVLAN (0x000000C0/4) /* Stacked VLAN reg */
#define GEM_MODID (0x000000FC/4) /* Module ID reg */
#define GEM_OCTTXLO (0x00000100/4) /* Octects transmitted Low reg */
#define GEM_OCTTXHI (0x00000104/4) /* Octects transmitted High reg */
#define GEM_TXCNT (0x00000108/4) /* Error-free Frames transmitted */
#define GEM_TXBCNT (0x0000010C/4) /* Error-free Broadcast Frames */
#define GEM_TXMCNT (0x00000110/4) /* Error-free Multicast Frame */
#define GEM_TXPAUSECNT (0x00000114/4) /* Pause Frames Transmitted */
#define GEM_TX64CNT (0x00000118/4) /* Error-free 64 TX */
#define GEM_TX65CNT (0x0000011C/4) /* Error-free 65-127 TX */
#define GEM_TX128CNT (0x00000120/4) /* Error-free 128-255 TX */
#define GEM_TX256CNT (0x00000124/4) /* Error-free 256-511 */
#define GEM_TX512CNT (0x00000128/4) /* Error-free 512-1023 TX */
#define GEM_TX1024CNT (0x0000012C/4) /* Error-free 1024-1518 TX */
#define GEM_TX1519CNT (0x00000130/4) /* Error-free larger than 1519 TX */
#define GEM_TXURUNCNT (0x00000134/4) /* TX under run error counter */
#define GEM_SINGLECOLLCNT (0x00000138/4) /* Single Collision Frames */
#define GEM_MULTCOLLCNT (0x0000013C/4) /* Multiple Collision Frames */
#define GEM_EXCESSCOLLCNT (0x00000140/4) /* Excessive Collision Frames */
#define GEM_LATECOLLCNT (0x00000144/4) /* Late Collision Frames */
#define GEM_DEFERTXCNT (0x00000148/4) /* Deferred Transmission Frames */
#define GEM_CSENSECNT (0x0000014C/4) /* Carrier Sense Error Counter */
#define GEM_OCTRXLO (0x00000150/4) /* Octects Received register Low */
#define GEM_OCTRXHI (0x00000154/4) /* Octects Received register High */
#define GEM_RXCNT (0x00000158/4) /* Error-free Frames Received */
#define GEM_RXBROADCNT (0x0000015C/4) /* Error-free Broadcast Frames RX */
#define GEM_RXMULTICNT (0x00000160/4) /* Error-free Multicast Frames RX */
#define GEM_RXPAUSECNT (0x00000164/4) /* Pause Frames Received Counter */
#define GEM_RX64CNT (0x00000168/4) /* Error-free 64 byte Frames RX */
#define GEM_RX65CNT (0x0000016C/4) /* Error-free 65-127B Frames RX */
#define GEM_RX128CNT (0x00000170/4) /* Error-free 128-255B Frames RX */
#define GEM_RX256CNT (0x00000174/4) /* Error-free 256-512B Frames RX */
#define GEM_RX512CNT (0x00000178/4) /* Error-free 512-1023B Frames RX */
#define GEM_RX1024CNT (0x0000017C/4) /* Error-free 1024-1518B Frames RX */
#define GEM_RX1519CNT (0x00000180/4) /* Error-free 1519-max Frames RX */
#define GEM_RXUNDERCNT (0x00000184/4) /* Undersize Frames Received */
#define GEM_RXOVERCNT (0x00000188/4) /* Oversize Frames Received */
#define GEM_RXJABCNT (0x0000018C/4) /* Jabbers Received Counter */
#define GEM_RXFCSCNT (0x00000190/4) /* Frame Check seq. Error Counter */
#define GEM_RXLENERRCNT (0x00000194/4) /* Length Field Error Counter */
#define GEM_RXSYMERRCNT (0x00000198/4) /* Symbol Error Counter */
#define GEM_RXALIGNERRCNT (0x0000019C/4) /* Alignment Error Counter */
#define GEM_RXRSCERRCNT (0x000001A0/4) /* Receive Resource Error Counter */
#define GEM_RXORUNCNT (0x000001A4/4) /* Receive Overrun Counter */
#define GEM_RXIPCSERRCNT (0x000001A8/4) /* IP header Checksum Error Counter */
#define GEM_RXTCPCCNT (0x000001AC/4) /* TCP Checksum Error Counter */
#define GEM_RXUDPCCNT (0x000001B0/4) /* UDP Checksum Error Counter */
#define GEM_1588S (0x000001D0/4) /* 1588 Timer Seconds */
#define GEM_1588NS (0x000001D4/4) /* 1588 Timer Nanoseconds */
#define GEM_1588ADJ (0x000001D8/4) /* 1588 Timer Adjust */
#define GEM_1588INC (0x000001DC/4) /* 1588 Timer Increment */
#define GEM_PTPETXS (0x000001E0/4) /* PTP Event Frame Transmitted (s) */
#define GEM_PTPETXNS (0x000001E4/4) /* PTP Event Frame Transmitted (ns) */
#define GEM_PTPERXS (0x000001E8/4) /* PTP Event Frame Received (s) */
#define GEM_PTPERXNS (0x000001EC/4) /* PTP Event Frame Received (ns) */
#define GEM_PTPPTXS (0x000001E0/4) /* PTP Peer Frame Transmitted (s) */
#define GEM_PTPPTXNS (0x000001E4/4) /* PTP Peer Frame Transmitted (ns) */
#define GEM_PTPPRXS (0x000001E8/4) /* PTP Peer Frame Received (s) */
#define GEM_PTPPRXNS (0x000001EC/4) /* PTP Peer Frame Received (ns) */
/* Design Configuration Registers */
#define GEM_DESCONF (0x00000280/4)
#define GEM_DESCONF2 (0x00000284/4)
#define GEM_DESCONF3 (0x00000288/4)
#define GEM_DESCONF4 (0x0000028C/4)
#define GEM_DESCONF5 (0x00000290/4)
#define GEM_DESCONF6 (0x00000294/4)
#define GEM_DESCONF7 (0x00000298/4)
#define GEM_MAXREG (0x00000640/4) /* Last valid GEM address */
/*****************************************/
#define GEM_NWCTRL_TXSTART 0x00000200 /* Transmit Enable */
#define GEM_NWCTRL_TXENA 0x00000008 /* Transmit Enable */
#define GEM_NWCTRL_RXENA 0x00000004 /* Receive Enable */
#define GEM_NWCTRL_LOCALLOOP 0x00000002 /* Local Loopback */
#define GEM_NWCFG_STRIP_FCS 0x00020000 /* Strip FCS field */
#define GEM_NWCFG_LERR_DISC 0x00010000 /* Discard RX frames with lenth err */
#define GEM_NWCFG_BUFF_OFST_M 0x0000C000 /* Receive buffer offset mask */
#define GEM_NWCFG_BUFF_OFST_S 14 /* Receive buffer offset shift */
#define GEM_NWCFG_UCAST_HASH 0x00000080 /* accept unicast if hash match */
#define GEM_NWCFG_MCAST_HASH 0x00000040 /* accept multicast if hash match */
#define GEM_NWCFG_BCAST_REJ 0x00000020 /* Reject broadcast packets */
#define GEM_NWCFG_PROMISC 0x00000010 /* Accept all packets */
#define GEM_DMACFG_RBUFSZ_M 0x007F0000 /* DMA RX Buffer Size mask */
#define GEM_DMACFG_RBUFSZ_S 16 /* DMA RX Buffer Size shift */
#define GEM_DMACFG_RBUFSZ_MUL 64 /* DMA RX Buffer Size multiplier */
#define GEM_DMACFG_TXCSUM_OFFL 0x00000800 /* Transmit checksum offload */
#define GEM_TXSTATUS_TXCMPL 0x00000020 /* Transmit Complete */
#define GEM_TXSTATUS_USED 0x00000001 /* sw owned descriptor encountered */
#define GEM_RXSTATUS_FRMRCVD 0x00000002 /* Frame received */
#define GEM_RXSTATUS_NOBUF 0x00000001 /* Buffer unavailable */
/* GEM_ISR GEM_IER GEM_IDR GEM_IMR */
#define GEM_INT_TXCMPL 0x00000080 /* Transmit Complete */
#define GEM_INT_TXUSED 0x00000008
#define GEM_INT_RXUSED 0x00000004
#define GEM_INT_RXCMPL 0x00000002
#define GEM_PHYMNTNC_OP_R 0x20000000 /* read operation */
#define GEM_PHYMNTNC_OP_W 0x10000000 /* write operation */
#define GEM_PHYMNTNC_ADDR 0x0F800000 /* Address bits */
#define GEM_PHYMNTNC_ADDR_SHFT 23
#define GEM_PHYMNTNC_REG 0x007C0000 /* register bits */
#define GEM_PHYMNTNC_REG_SHIFT 18
/* Marvell PHY definitions */
#define BOARD_PHY_ADDRESS 23 /* PHY address we will emulate a device at */
#define PHY_REG_CONTROL 0
#define PHY_REG_STATUS 1
#define PHY_REG_PHYID1 2
#define PHY_REG_PHYID2 3
#define PHY_REG_ANEGADV 4
#define PHY_REG_LINKPABIL 5
#define PHY_REG_ANEGEXP 6
#define PHY_REG_NEXTP 7
#define PHY_REG_LINKPNEXTP 8
#define PHY_REG_100BTCTRL 9
#define PHY_REG_1000BTSTAT 10
#define PHY_REG_EXTSTAT 15
#define PHY_REG_PHYSPCFC_CTL 16
#define PHY_REG_PHYSPCFC_ST 17
#define PHY_REG_INT_EN 18
#define PHY_REG_INT_ST 19
#define PHY_REG_EXT_PHYSPCFC_CTL 20
#define PHY_REG_RXERR 21
#define PHY_REG_EACD 22
#define PHY_REG_LED 24
#define PHY_REG_LED_OVRD 25
#define PHY_REG_EXT_PHYSPCFC_CTL2 26
#define PHY_REG_EXT_PHYSPCFC_ST 27
#define PHY_REG_CABLE_DIAG 28
#define PHY_REG_CONTROL_RST 0x8000
#define PHY_REG_CONTROL_LOOP 0x4000
#define PHY_REG_CONTROL_ANEG 0x1000
#define PHY_REG_STATUS_LINK 0x0004
#define PHY_REG_STATUS_ANEGCMPL 0x0020
#define PHY_REG_INT_ST_ANEGCMPL 0x0800
#define PHY_REG_INT_ST_LINKC 0x0400
#define PHY_REG_INT_ST_ENERGY 0x0010
/***********************************************************************/
#define GEM_RX_REJECT 1
#define GEM_RX_ACCEPT 0
/***********************************************************************/
#define DESC_1_USED 0x80000000
#define DESC_1_LENGTH 0x00001FFF
#define DESC_1_TX_WRAP 0x40000000
#define DESC_1_TX_LAST 0x00008000
#define DESC_0_RX_WRAP 0x00000002
#define DESC_0_RX_OWNERSHIP 0x00000001
#define DESC_1_RX_SOF 0x00004000
#define DESC_1_RX_EOF 0x00008000
static inline unsigned tx_desc_get_buffer(unsigned *desc)
{
return desc[0];
}
static inline unsigned tx_desc_get_used(unsigned *desc)
{
return (desc[1] & DESC_1_USED) ? 1 : 0;
}
static inline void tx_desc_set_used(unsigned *desc)
{
desc[1] |= DESC_1_USED;
}
static inline unsigned tx_desc_get_wrap(unsigned *desc)
{
return (desc[1] & DESC_1_TX_WRAP) ? 1 : 0;
}
static inline unsigned tx_desc_get_last(unsigned *desc)
{
return (desc[1] & DESC_1_TX_LAST) ? 1 : 0;
}
static inline unsigned tx_desc_get_length(unsigned *desc)
{
return desc[1] & DESC_1_LENGTH;
}
static inline void print_gem_tx_desc(unsigned *desc)
{
DB_PRINT("TXDESC:\n");
DB_PRINT("bufaddr: 0x%08x\n", *desc);
DB_PRINT("used_hw: %d\n", tx_desc_get_used(desc));
DB_PRINT("wrap: %d\n", tx_desc_get_wrap(desc));
DB_PRINT("last: %d\n", tx_desc_get_last(desc));
DB_PRINT("length: %d\n", tx_desc_get_length(desc));
}
static inline unsigned rx_desc_get_buffer(unsigned *desc)
{
return desc[0] & ~0x3UL;
}
static inline unsigned rx_desc_get_wrap(unsigned *desc)
{
return desc[0] & DESC_0_RX_WRAP ? 1 : 0;
}
static inline unsigned rx_desc_get_ownership(unsigned *desc)
{
return desc[0] & DESC_0_RX_OWNERSHIP ? 1 : 0;
}
static inline void rx_desc_set_ownership(unsigned *desc)
{
desc[0] |= DESC_0_RX_OWNERSHIP;
}
static inline void rx_desc_set_sof(unsigned *desc)
{
desc[1] |= DESC_1_RX_SOF;
}
static inline void rx_desc_set_eof(unsigned *desc)
{
desc[1] |= DESC_1_RX_EOF;
}
static inline void rx_desc_set_length(unsigned *desc, unsigned len)
{
desc[1] &= ~DESC_1_LENGTH;
desc[1] |= len;
}
typedef struct {
SysBusDevice busdev;
MemoryRegion iomem;
NICState *nic;
NICConf conf;
qemu_irq irq;
/* GEM registers backing store */
uint32_t regs[GEM_MAXREG];
/* Mask of register bits which are write only */
uint32_t regs_wo[GEM_MAXREG];
/* Mask of register bits which are read only */
uint32_t regs_ro[GEM_MAXREG];
/* Mask of register bits which are clear on read */
uint32_t regs_rtc[GEM_MAXREG];
/* Mask of register bits which are write 1 to clear */
uint32_t regs_w1c[GEM_MAXREG];
/* PHY registers backing store */
uint16_t phy_regs[32];
uint8_t phy_loop; /* Are we in phy loopback? */
/* The current DMA descriptor pointers */
target_phys_addr_t rx_desc_addr;
target_phys_addr_t tx_desc_addr;
} GemState;
/* The broadcast MAC address: 0xFFFFFFFFFFFF */
const uint8_t broadcast_addr[] = { 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF };
/*
* gem_init_register_masks:
* One time initialization.
* Set masks to identify which register bits have magical clear properties
*/
static void gem_init_register_masks(GemState *s)
{
/* Mask of register bits which are read only*/
memset(&s->regs_ro[0], 0, sizeof(s->regs_ro));
s->regs_ro[GEM_NWCTRL] = 0xFFF80000;
s->regs_ro[GEM_NWSTATUS] = 0xFFFFFFFF;
s->regs_ro[GEM_DMACFG] = 0xFE00F000;
s->regs_ro[GEM_TXSTATUS] = 0xFFFFFE08;
s->regs_ro[GEM_RXQBASE] = 0x00000003;
s->regs_ro[GEM_TXQBASE] = 0x00000003;
s->regs_ro[GEM_RXSTATUS] = 0xFFFFFFF0;
s->regs_ro[GEM_ISR] = 0xFFFFFFFF;
s->regs_ro[GEM_IMR] = 0xFFFFFFFF;
s->regs_ro[GEM_MODID] = 0xFFFFFFFF;
/* Mask of register bits which are clear on read */
memset(&s->regs_rtc[0], 0, sizeof(s->regs_rtc));
s->regs_rtc[GEM_ISR] = 0xFFFFFFFF;
/* Mask of register bits which are write 1 to clear */
memset(&s->regs_w1c[0], 0, sizeof(s->regs_w1c));
s->regs_w1c[GEM_TXSTATUS] = 0x000001F7;
s->regs_w1c[GEM_RXSTATUS] = 0x0000000F;
/* Mask of register bits which are write only */
memset(&s->regs_wo[0], 0, sizeof(s->regs_wo));
s->regs_wo[GEM_NWCTRL] = 0x00073E60;
s->regs_wo[GEM_IER] = 0x07FFFFFF;
s->regs_wo[GEM_IDR] = 0x07FFFFFF;
}
/*
* phy_update_link:
* Make the emulated PHY link state match the QEMU "interface" state.
*/
static void phy_update_link(GemState *s)
{
DB_PRINT("down %d\n", s->nic->nc.link_down);
/* Autonegotiation status mirrors link status. */
if (s->nic->nc.link_down) {
s->phy_regs[PHY_REG_STATUS] &= ~(PHY_REG_STATUS_ANEGCMPL |
PHY_REG_STATUS_LINK);
s->phy_regs[PHY_REG_INT_ST] |= PHY_REG_INT_ST_LINKC;
} else {
s->phy_regs[PHY_REG_STATUS] |= (PHY_REG_STATUS_ANEGCMPL |
PHY_REG_STATUS_LINK);
s->phy_regs[PHY_REG_INT_ST] |= (PHY_REG_INT_ST_LINKC |
PHY_REG_INT_ST_ANEGCMPL |
PHY_REG_INT_ST_ENERGY);
}
}
static int gem_can_receive(VLANClientState *nc)
{
GemState *s;
s = DO_UPCAST(NICState, nc, nc)->opaque;
DB_PRINT("\n");
/* Do nothing if receive is not enabled. */
if (!(s->regs[GEM_NWCTRL] & GEM_NWCTRL_RXENA)) {
return 0;
}
return 1;
}
/*
* gem_update_int_status:
* Raise or lower interrupt based on current status.
*/
static void gem_update_int_status(GemState *s)
{
uint32_t new_interrupts = 0;
/* Packet transmitted ? */
if (s->regs[GEM_TXSTATUS] & GEM_TXSTATUS_TXCMPL) {
new_interrupts |= GEM_INT_TXCMPL;
}
/* End of TX ring ? */
if (s->regs[GEM_TXSTATUS] & GEM_TXSTATUS_USED) {
new_interrupts |= GEM_INT_TXUSED;
}
/* Frame received ? */
if (s->regs[GEM_RXSTATUS] & GEM_RXSTATUS_FRMRCVD) {
new_interrupts |= GEM_INT_RXCMPL;
}
/* RX ring full ? */
if (s->regs[GEM_RXSTATUS] & GEM_RXSTATUS_NOBUF) {
new_interrupts |= GEM_INT_RXUSED;
}
s->regs[GEM_ISR] |= new_interrupts & ~(s->regs[GEM_IMR]);
if (s->regs[GEM_ISR]) {
DB_PRINT("asserting int. (0x%08x)\n", s->regs[GEM_ISR]);
qemu_set_irq(s->irq, 1);
} else {
qemu_set_irq(s->irq, 0);
}
}
/*
* gem_receive_updatestats:
* Increment receive statistics.
*/
static void gem_receive_updatestats(GemState *s, const uint8_t *packet,
unsigned bytes)
{
uint64_t octets;
/* Total octets (bytes) received */
octets = ((uint64_t)(s->regs[GEM_OCTRXLO]) << 32) |
s->regs[GEM_OCTRXHI];
octets += bytes;
s->regs[GEM_OCTRXLO] = octets >> 32;
s->regs[GEM_OCTRXHI] = octets;
/* Error-free Frames received */
s->regs[GEM_RXCNT]++;
/* Error-free Broadcast Frames counter */
if (!memcmp(packet, broadcast_addr, 6)) {
s->regs[GEM_RXBROADCNT]++;
}
/* Error-free Multicast Frames counter */
if (packet[0] == 0x01) {
s->regs[GEM_RXMULTICNT]++;
}
if (bytes <= 64) {
s->regs[GEM_RX64CNT]++;
} else if (bytes <= 127) {
s->regs[GEM_RX65CNT]++;
} else if (bytes <= 255) {
s->regs[GEM_RX128CNT]++;
} else if (bytes <= 511) {
s->regs[GEM_RX256CNT]++;
} else if (bytes <= 1023) {
s->regs[GEM_RX512CNT]++;
} else if (bytes <= 1518) {
s->regs[GEM_RX1024CNT]++;
} else {
s->regs[GEM_RX1519CNT]++;
}
}
/*
* Get the MAC Address bit from the specified position
*/
static unsigned get_bit(const uint8_t *mac, unsigned bit)
{
unsigned byte;
byte = mac[bit / 8];
byte >>= (bit & 0x7);
byte &= 1;
return byte;
}
/*
* Calculate a GEM MAC Address hash index
*/
static unsigned calc_mac_hash(const uint8_t *mac)
{
int index_bit, mac_bit;
unsigned hash_index;
hash_index = 0;
mac_bit = 5;
for (index_bit = 5; index_bit >= 0; index_bit--) {
hash_index |= (get_bit(mac, mac_bit) ^
get_bit(mac, mac_bit + 6) ^
get_bit(mac, mac_bit + 12) ^
get_bit(mac, mac_bit + 18) ^
get_bit(mac, mac_bit + 24) ^
get_bit(mac, mac_bit + 30) ^
get_bit(mac, mac_bit + 36) ^
get_bit(mac, mac_bit + 42)) << index_bit;
mac_bit--;
}
return hash_index;
}
/*
* gem_mac_address_filter:
* Accept or reject this destination address?
* Returns:
* GEM_RX_REJECT: reject
* GEM_RX_ACCEPT: accept
*/
static int gem_mac_address_filter(GemState *s, const uint8_t *packet)
{
uint8_t *gem_spaddr;
int i;
/* Promiscuous mode? */
if (s->regs[GEM_NWCFG] & GEM_NWCFG_PROMISC) {
return GEM_RX_ACCEPT;
}
if (!memcmp(packet, broadcast_addr, 6)) {
/* Reject broadcast packets? */
if (s->regs[GEM_NWCFG] & GEM_NWCFG_BCAST_REJ) {
return GEM_RX_REJECT;
}
return GEM_RX_ACCEPT;
}
/* Accept packets -w- hash match? */
if ((packet[0] == 0x01 && (s->regs[GEM_NWCFG] & GEM_NWCFG_MCAST_HASH)) ||
(packet[0] != 0x01 && (s->regs[GEM_NWCFG] & GEM_NWCFG_UCAST_HASH))) {
unsigned hash_index;
hash_index = calc_mac_hash(packet);
if (hash_index < 32) {
if (s->regs[GEM_HASHLO] & (1<<hash_index)) {
return GEM_RX_ACCEPT;
}
} else {
hash_index -= 32;
if (s->regs[GEM_HASHHI] & (1<<hash_index)) {
return GEM_RX_ACCEPT;
}
}
}
/* Check all 4 specific addresses */
gem_spaddr = (uint8_t *)&(s->regs[GEM_SPADDR1LO]);
for (i = 0; i < 4; i++) {
if (!memcmp(packet, gem_spaddr, 6)) {
return GEM_RX_ACCEPT;
}
gem_spaddr += 8;
}
/* No address match; reject the packet */
return GEM_RX_REJECT;
}
/*
* gem_receive:
* Fit a packet handed to us by QEMU into the receive descriptor ring.
*/
static ssize_t gem_receive(VLANClientState *nc, const uint8_t *buf, size_t size)
{
unsigned desc[2];
target_phys_addr_t packet_desc_addr, last_desc_addr;
GemState *s;
unsigned rxbufsize, bytes_to_copy;
unsigned rxbuf_offset;
uint8_t rxbuf[2048];
uint8_t *rxbuf_ptr;
s = DO_UPCAST(NICState, nc, nc)->opaque;
/* Do nothing if receive is not enabled. */
if (!(s->regs[GEM_NWCTRL] & GEM_NWCTRL_RXENA)) {
return -1;
}
/* Is this destination MAC address "for us" ? */
if (gem_mac_address_filter(s, buf) == GEM_RX_REJECT) {
return -1;
}
/* Discard packets with receive length error enabled ? */
if (s->regs[GEM_NWCFG] & GEM_NWCFG_LERR_DISC) {
unsigned type_len;
/* Fish the ethertype / length field out of the RX packet */
type_len = buf[12] << 8 | buf[13];
/* It is a length field, not an ethertype */
if (type_len < 0x600) {
if (size < type_len) {
/* discard */
return -1;
}
}
}
/*
* Determine configured receive buffer offset (probably 0)
*/
rxbuf_offset = (s->regs[GEM_NWCFG] & GEM_NWCFG_BUFF_OFST_M) >>
GEM_NWCFG_BUFF_OFST_S;
/* The configure size of each receive buffer. Determines how many
* buffers needed to hold this packet.
*/
rxbufsize = ((s->regs[GEM_DMACFG] & GEM_DMACFG_RBUFSZ_M) >>
GEM_DMACFG_RBUFSZ_S) * GEM_DMACFG_RBUFSZ_MUL;
bytes_to_copy = size;
/* Strip of FCS field ? (usually yes) */
if (s->regs[GEM_NWCFG] & GEM_NWCFG_STRIP_FCS) {
rxbuf_ptr = (void *)buf;
} else {
unsigned crc_val;
int crc_offset;
/* The application wants the FCS field, which QEMU does not provide.
* We must try and caclculate one.
*/
memcpy(rxbuf, buf, size);
memset(rxbuf + size, 0, sizeof(rxbuf) - size);
rxbuf_ptr = rxbuf;
crc_val = cpu_to_le32(crc32(0, rxbuf, MAX(size, 60)));
if (size < 60) {
crc_offset = 60;
} else {
crc_offset = size;
}
memcpy(rxbuf + crc_offset, &crc_val, sizeof(crc_val));
bytes_to_copy += 4;
size += 4;
}
/* Pad to minimum length */
if (size < 64) {
size = 64;
}
DB_PRINT("config bufsize: %d packet size: %ld\n", rxbufsize, size);
packet_desc_addr = s->rx_desc_addr;
while (1) {
DB_PRINT("read descriptor 0x%x\n", packet_desc_addr);
/* read current descriptor */
cpu_physical_memory_read(packet_desc_addr,
(uint8_t *)&desc[0], sizeof(desc));
/* Descriptor owned by software ? */
if (rx_desc_get_ownership(desc) == 1) {
DB_PRINT("descriptor 0x%x owned by sw.\n", packet_desc_addr);
s->regs[GEM_RXSTATUS] |= GEM_RXSTATUS_NOBUF;
/* Handle interrupt consequences */
gem_update_int_status(s);
return -1;
}
DB_PRINT("copy %d bytes to 0x%x\n", MIN(bytes_to_copy, rxbufsize),
rx_desc_get_buffer(desc));
/*
* Let's have QEMU lend a helping hand.
*/
if (rx_desc_get_buffer(desc) == 0) {
DB_PRINT("Invalid RX buffer (NULL) for descriptor 0x%x\n",
packet_desc_addr);
break;
}
/* Copy packet data to emulated DMA buffer */
cpu_physical_memory_write(rx_desc_get_buffer(desc) + rxbuf_offset,
rxbuf_ptr, MIN(bytes_to_copy, rxbufsize));
bytes_to_copy -= MIN(bytes_to_copy, rxbufsize);
rxbuf_ptr += MIN(bytes_to_copy, rxbufsize);
if (bytes_to_copy == 0) {
break;
}
/* Next descriptor */
if (rx_desc_get_wrap(desc)) {
packet_desc_addr = s->regs[GEM_RXQBASE];
} else {
packet_desc_addr += 8;
}
}
DB_PRINT("set length: %ld, EOF on descriptor 0x%x\n", size,
(unsigned)packet_desc_addr);
/* Update last descriptor with EOF and total length */
rx_desc_set_eof(desc);
rx_desc_set_length(desc, size);
cpu_physical_memory_write(packet_desc_addr,
(uint8_t *)&desc[0], sizeof(desc));
/* Advance RX packet descriptor Q */
last_desc_addr = packet_desc_addr;
packet_desc_addr = s->rx_desc_addr;
s->rx_desc_addr = last_desc_addr;
if (rx_desc_get_wrap(desc)) {
s->rx_desc_addr = s->regs[GEM_RXQBASE];
} else {
s->rx_desc_addr += 8;
}
DB_PRINT("set SOF, OWN on descriptor 0x%08x\n", packet_desc_addr);
/* Count it */
gem_receive_updatestats(s, buf, size);
/* Update first descriptor (which could also be the last) */
/* read descriptor */
cpu_physical_memory_read(packet_desc_addr,
(uint8_t *)&desc[0], sizeof(desc));
rx_desc_set_sof(desc);
rx_desc_set_ownership(desc);
cpu_physical_memory_write(packet_desc_addr,
(uint8_t *)&desc[0], sizeof(desc));
s->regs[GEM_RXSTATUS] |= GEM_RXSTATUS_FRMRCVD;
/* Handle interrupt consequences */
gem_update_int_status(s);
return size;
}
/*
* gem_transmit_updatestats:
* Increment transmit statistics.
*/
static void gem_transmit_updatestats(GemState *s, const uint8_t *packet,
unsigned bytes)
{
uint64_t octets;
/* Total octets (bytes) transmitted */
octets = ((uint64_t)(s->regs[GEM_OCTTXLO]) << 32) |
s->regs[GEM_OCTTXHI];
octets += bytes;
s->regs[GEM_OCTTXLO] = octets >> 32;
s->regs[GEM_OCTTXHI] = octets;
/* Error-free Frames transmitted */
s->regs[GEM_TXCNT]++;
/* Error-free Broadcast Frames counter */
if (!memcmp(packet, broadcast_addr, 6)) {
s->regs[GEM_TXBCNT]++;
}
/* Error-free Multicast Frames counter */
if (packet[0] == 0x01) {
s->regs[GEM_TXMCNT]++;
}
if (bytes <= 64) {
s->regs[GEM_TX64CNT]++;
} else if (bytes <= 127) {
s->regs[GEM_TX65CNT]++;
} else if (bytes <= 255) {
s->regs[GEM_TX128CNT]++;
} else if (bytes <= 511) {
s->regs[GEM_TX256CNT]++;
} else if (bytes <= 1023) {
s->regs[GEM_TX512CNT]++;
} else if (bytes <= 1518) {
s->regs[GEM_TX1024CNT]++;
} else {
s->regs[GEM_TX1519CNT]++;
}
}
/*
* gem_transmit:
* Fish packets out of the descriptor ring and feed them to QEMU
*/
static void gem_transmit(GemState *s)
{
unsigned desc[2];
target_phys_addr_t packet_desc_addr;
uint8_t tx_packet[2048];
uint8_t *p;
unsigned total_bytes;
/* Do nothing if transmit is not enabled. */
if (!(s->regs[GEM_NWCTRL] & GEM_NWCTRL_TXENA)) {
return;
}
DB_PRINT("\n");
/* The packet we will hand off to qemu.
* Packets scattered across multiple descriptors are gathered to this
* one contiguous buffer first.
*/
p = tx_packet;
total_bytes = 0;
/* read current descriptor */
packet_desc_addr = s->tx_desc_addr;
cpu_physical_memory_read(packet_desc_addr,
(uint8_t *)&desc[0], sizeof(desc));
/* Handle all descriptors owned by hardware */
while (tx_desc_get_used(desc) == 0) {
/* Do nothing if transmit is not enabled. */
if (!(s->regs[GEM_NWCTRL] & GEM_NWCTRL_TXENA)) {
return;
}
print_gem_tx_desc(desc);
/* The real hardware would eat this (and possibly crash).
* For QEMU let's lend a helping hand.
*/
if ((tx_desc_get_buffer(desc) == 0) ||
(tx_desc_get_length(desc) == 0)) {
DB_PRINT("Invalid TX descriptor @ 0x%x\n", packet_desc_addr);
break;
}
/* Gather this fragment of the packet from "dma memory" to our contig.
* buffer.
*/
cpu_physical_memory_read(tx_desc_get_buffer(desc), p,
tx_desc_get_length(desc));
p += tx_desc_get_length(desc);
total_bytes += tx_desc_get_length(desc);
/* Last descriptor for this packet; hand the whole thing off */
if (tx_desc_get_last(desc)) {
/* Modify the 1st descriptor of this packet to be owned by
* the processor.
*/
cpu_physical_memory_read(s->tx_desc_addr,
(uint8_t *)&desc[0], sizeof(desc));
tx_desc_set_used(desc);
cpu_physical_memory_write(s->tx_desc_addr,
(uint8_t *)&desc[0], sizeof(desc));
/* Advance the hardare current descriptor past this packet */
if (tx_desc_get_wrap(desc)) {
s->tx_desc_addr = s->regs[GEM_TXQBASE];
} else {
s->tx_desc_addr = packet_desc_addr + 8;
}
DB_PRINT("TX descriptor next: 0x%08x\n", s->tx_desc_addr);
s->regs[GEM_TXSTATUS] |= GEM_TXSTATUS_TXCMPL;
/* Handle interrupt consequences */
gem_update_int_status(s);
/* Is checksum offload enabled? */
if (s->regs[GEM_DMACFG] & GEM_DMACFG_TXCSUM_OFFL) {
net_checksum_calculate(tx_packet, total_bytes);
}
/* Update MAC statistics */
gem_transmit_updatestats(s, tx_packet, total_bytes);
/* Send the packet somewhere */
if (s->phy_loop) {
gem_receive(&s->nic->nc, tx_packet, total_bytes);
} else {
qemu_send_packet(&s->nic->nc, tx_packet, total_bytes);
}
/* Prepare for next packet */
p = tx_packet;
total_bytes = 0;
}
/* read next descriptor */
if (tx_desc_get_wrap(desc)) {
packet_desc_addr = s->regs[GEM_TXQBASE];
} else {
packet_desc_addr += 8;
}
cpu_physical_memory_read(packet_desc_addr,
(uint8_t *)&desc[0], sizeof(desc));
}
if (tx_desc_get_used(desc)) {
s->regs[GEM_TXSTATUS] |= GEM_TXSTATUS_USED;
gem_update_int_status(s);
}
}
static void gem_phy_reset(GemState *s)
{
memset(&s->phy_regs[0], 0, sizeof(s->phy_regs));
s->phy_regs[PHY_REG_CONTROL] = 0x1140;
s->phy_regs[PHY_REG_STATUS] = 0x7969;
s->phy_regs[PHY_REG_PHYID1] = 0x0141;
s->phy_regs[PHY_REG_PHYID2] = 0x0CC2;
s->phy_regs[PHY_REG_ANEGADV] = 0x01E1;
s->phy_regs[PHY_REG_LINKPABIL] = 0xCDE1;
s->phy_regs[PHY_REG_ANEGEXP] = 0x000F;
s->phy_regs[PHY_REG_NEXTP] = 0x2001;
s->phy_regs[PHY_REG_LINKPNEXTP] = 0x40E6;
s->phy_regs[PHY_REG_100BTCTRL] = 0x0300;
s->phy_regs[PHY_REG_1000BTSTAT] = 0x7C00;
s->phy_regs[PHY_REG_EXTSTAT] = 0x3000;
s->phy_regs[PHY_REG_PHYSPCFC_CTL] = 0x0078;
s->phy_regs[PHY_REG_PHYSPCFC_ST] = 0xBC00;
s->phy_regs[PHY_REG_EXT_PHYSPCFC_CTL] = 0x0C60;
s->phy_regs[PHY_REG_LED] = 0x4100;
s->phy_regs[PHY_REG_EXT_PHYSPCFC_CTL2] = 0x000A;
s->phy_regs[PHY_REG_EXT_PHYSPCFC_ST] = 0x848B;
phy_update_link(s);
}
static void gem_reset(DeviceState *d)
{
GemState *s = FROM_SYSBUS(GemState, sysbus_from_qdev(d));
DB_PRINT("\n");
/* Set post reset register values */
memset(&s->regs[0], 0, sizeof(s->regs));
s->regs[GEM_NWCFG] = 0x00080000;
s->regs[GEM_NWSTATUS] = 0x00000006;
s->regs[GEM_DMACFG] = 0x00020784;
s->regs[GEM_IMR] = 0x07ffffff;
s->regs[GEM_TXPAUSE] = 0x0000ffff;
s->regs[GEM_TXPARTIALSF] = 0x000003ff;
s->regs[GEM_RXPARTIALSF] = 0x000003ff;
s->regs[GEM_MODID] = 0x00020118;
s->regs[GEM_DESCONF] = 0x02500111;
s->regs[GEM_DESCONF2] = 0x2ab13fff;
s->regs[GEM_DESCONF5] = 0x002f2145;
s->regs[GEM_DESCONF6] = 0x00000200;
gem_phy_reset(s);
gem_update_int_status(s);
}
static uint16_t gem_phy_read(GemState *s, unsigned reg_num)
{
DB_PRINT("reg: %d value: 0x%04x\n", reg_num, s->phy_regs[reg_num]);
return s->phy_regs[reg_num];
}
static void gem_phy_write(GemState *s, unsigned reg_num, uint16_t val)
{
DB_PRINT("reg: %d value: 0x%04x\n", reg_num, val);
switch (reg_num) {
case PHY_REG_CONTROL:
if (val & PHY_REG_CONTROL_RST) {
/* Phy reset */
gem_phy_reset(s);
val &= ~(PHY_REG_CONTROL_RST | PHY_REG_CONTROL_LOOP);
s->phy_loop = 0;
}
if (val & PHY_REG_CONTROL_ANEG) {
/* Complete autonegotiation immediately */
val &= ~PHY_REG_CONTROL_ANEG;
s->phy_regs[PHY_REG_STATUS] |= PHY_REG_STATUS_ANEGCMPL;
}
if (val & PHY_REG_CONTROL_LOOP) {
DB_PRINT("PHY placed in loopback\n");
s->phy_loop = 1;
} else {
s->phy_loop = 0;
}
break;
}
s->phy_regs[reg_num] = val;
}
/*
* gem_read32:
* Read a GEM register.
*/
static uint64_t gem_read(void *opaque, target_phys_addr_t offset, unsigned size)
{
GemState *s;
uint32_t retval;
s = (GemState *)opaque;
offset >>= 2;
retval = s->regs[offset];
DB_PRINT("offset: 0x%04x read: 0x%08x\n", offset*4, retval);
switch (offset) {
case GEM_ISR:
qemu_set_irq(s->irq, 0);
break;
case GEM_PHYMNTNC:
if (retval & GEM_PHYMNTNC_OP_R) {
uint32_t phy_addr, reg_num;
phy_addr = (retval & GEM_PHYMNTNC_ADDR) >> GEM_PHYMNTNC_ADDR_SHFT;
if (phy_addr == BOARD_PHY_ADDRESS) {
reg_num = (retval & GEM_PHYMNTNC_REG) >> GEM_PHYMNTNC_REG_SHIFT;
retval &= 0xFFFF0000;
retval |= gem_phy_read(s, reg_num);
} else {
retval |= 0xFFFF; /* No device at this address */
}
}
break;
}
/* Squash read to clear bits */
s->regs[offset] &= ~(s->regs_rtc[offset]);
/* Do not provide write only bits */
retval &= ~(s->regs_wo[offset]);
DB_PRINT("0x%08x\n", retval);
return retval;
}
/*
* gem_write32:
* Write a GEM register.
*/
static void gem_write(void *opaque, target_phys_addr_t offset, uint64_t val,
unsigned size)
{
GemState *s = (GemState *)opaque;
uint32_t readonly;
DB_PRINT("offset: 0x%04x write: 0x%08x ", offset, (unsigned)val);
offset >>= 2;
/* Squash bits which are read only in write value */
val &= ~(s->regs_ro[offset]);
/* Preserve (only) bits which are read only in register */
readonly = s->regs[offset];
readonly &= s->regs_ro[offset];
/* Squash bits which are write 1 to clear */
val &= ~(s->regs_w1c[offset] & val);
/* Copy register write to backing store */
s->regs[offset] = val | readonly;
/* Handle register write side effects */
switch (offset) {
case GEM_NWCTRL:
if (val & GEM_NWCTRL_TXSTART) {
gem_transmit(s);
}
if (!(val & GEM_NWCTRL_TXENA)) {
/* Reset to start of Q when transmit disabled. */
s->tx_desc_addr = s->regs[GEM_TXQBASE];
}
if (!(val & GEM_NWCTRL_RXENA)) {
/* Reset to start of Q when receive disabled. */
s->rx_desc_addr = s->regs[GEM_RXQBASE];
}
break;
case GEM_TXSTATUS:
gem_update_int_status(s);
break;
case GEM_RXQBASE:
s->rx_desc_addr = val;
break;
case GEM_TXQBASE:
s->tx_desc_addr = val;
break;
case GEM_RXSTATUS:
gem_update_int_status(s);
break;
case GEM_IER:
s->regs[GEM_IMR] &= ~val;
gem_update_int_status(s);
break;
case GEM_IDR:
s->regs[GEM_IMR] |= val;
gem_update_int_status(s);
break;
case GEM_PHYMNTNC:
if (val & GEM_PHYMNTNC_OP_W) {
uint32_t phy_addr, reg_num;
phy_addr = (val & GEM_PHYMNTNC_ADDR) >> GEM_PHYMNTNC_ADDR_SHFT;
if (phy_addr == BOARD_PHY_ADDRESS) {
reg_num = (val & GEM_PHYMNTNC_REG) >> GEM_PHYMNTNC_REG_SHIFT;
gem_phy_write(s, reg_num, val);
}
}
break;
}
DB_PRINT("newval: 0x%08x\n", s->regs[offset]);
}
static const MemoryRegionOps gem_ops = {
.read = gem_read,
.write = gem_write,
.endianness = DEVICE_LITTLE_ENDIAN,
};
static void gem_cleanup(VLANClientState *nc)
{
GemState *s = DO_UPCAST(NICState, nc, nc)->opaque;
DB_PRINT("\n");
s->nic = NULL;
}
static void gem_set_link(VLANClientState *nc)
{
DB_PRINT("\n");
phy_update_link(DO_UPCAST(NICState, nc, nc)->opaque);
}
static NetClientInfo net_gem_info = {
.type = NET_CLIENT_TYPE_NIC,
.size = sizeof(NICState),
.can_receive = gem_can_receive,
.receive = gem_receive,
.cleanup = gem_cleanup,
.link_status_changed = gem_set_link,
};
static int gem_init(SysBusDevice *dev)
{
GemState *s;
DB_PRINT("\n");
s = FROM_SYSBUS(GemState, dev);
gem_init_register_masks(s);
memory_region_init_io(&s->iomem, &gem_ops, s, "enet", sizeof(s->regs));
sysbus_init_mmio(dev, &s->iomem);
sysbus_init_irq(dev, &s->irq);
qemu_macaddr_default_if_unset(&s->conf.macaddr);
s->nic = qemu_new_nic(&net_gem_info, &s->conf,
object_get_typename(OBJECT(dev)), dev->qdev.id, s);
return 0;
}
static const VMStateDescription vmstate_cadence_gem = {
.name = "cadence_gem",
.version_id = 1,
.minimum_version_id = 1,
.minimum_version_id_old = 1,
.fields = (VMStateField[]) {
VMSTATE_UINT32_ARRAY(regs, GemState, GEM_MAXREG),
VMSTATE_UINT16_ARRAY(phy_regs, GemState, 32),
VMSTATE_UINT8(phy_loop, GemState),
VMSTATE_UINT32(rx_desc_addr, GemState),
VMSTATE_UINT32(tx_desc_addr, GemState),
}
};
static Property gem_properties[] = {
DEFINE_NIC_PROPERTIES(GemState, conf),
DEFINE_PROP_END_OF_LIST(),
};
static void gem_class_init(ObjectClass *klass, void *data)
{
DeviceClass *dc = DEVICE_CLASS(klass);
SysBusDeviceClass *sdc = SYS_BUS_DEVICE_CLASS(klass);
sdc->init = gem_init;
dc->props = gem_properties;
dc->vmsd = &vmstate_cadence_gem;
dc->reset = gem_reset;
}
static TypeInfo gem_info = {
.class_init = gem_class_init,
.name = "cadence_gem",
.parent = TYPE_SYS_BUS_DEVICE,
.instance_size = sizeof(GemState),
};
static void gem_register_types(void)
{
type_register_static(&gem_info);
}
type_init(gem_register_types)
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