diff options
Diffstat (limited to 'src/hw/net/fsl_etsec/rings.c')
| -rw-r--r-- | src/hw/net/fsl_etsec/rings.c | 653 |
1 files changed, 653 insertions, 0 deletions
diff --git a/src/hw/net/fsl_etsec/rings.c b/src/hw/net/fsl_etsec/rings.c new file mode 100644 index 0000000..0a5c6cf --- /dev/null +++ b/src/hw/net/fsl_etsec/rings.c @@ -0,0 +1,653 @@ +/* + * QEMU Freescale eTSEC Emulator + * + * Copyright (c) 2011-2013 AdaCore + * + * 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 "net/checksum.h" + +#include "etsec.h" +#include "registers.h" + +/* #define ETSEC_RING_DEBUG */ +/* #define HEX_DUMP */ +/* #define DEBUG_BD */ + +#ifdef ETSEC_RING_DEBUG +static const int debug_etsec = 1; +#else +static const int debug_etsec; +#endif + +#define RING_DEBUG(fmt, ...) do { \ + if (debug_etsec) { \ + qemu_log(fmt , ## __VA_ARGS__); \ + } \ + } while (0) + +#ifdef DEBUG_BD + +static void print_tx_bd_flags(uint16_t flags) +{ + qemu_log(" Ready: %d\n", !!(flags & BD_TX_READY)); + qemu_log(" PAD/CRC: %d\n", !!(flags & BD_TX_PADCRC)); + qemu_log(" Wrap: %d\n", !!(flags & BD_WRAP)); + qemu_log(" Interrupt: %d\n", !!(flags & BD_INTERRUPT)); + qemu_log(" Last in frame: %d\n", !!(flags & BD_LAST)); + qemu_log(" Tx CRC: %d\n", !!(flags & BD_TX_TC)); + qemu_log(" User-defined preamble / defer: %d\n", + !!(flags & BD_TX_PREDEF)); + qemu_log(" Huge frame enable / Late collision: %d\n", + !!(flags & BD_TX_HFELC)); + qemu_log(" Control frame / Retransmission Limit: %d\n", + !!(flags & BD_TX_CFRL)); + qemu_log(" Retry count: %d\n", + (flags >> BD_TX_RC_OFFSET) & BD_TX_RC_MASK); + qemu_log(" Underrun / TCP/IP off-load enable: %d\n", + !!(flags & BD_TX_TOEUN)); + qemu_log(" Truncation: %d\n", !!(flags & BD_TX_TR)); +} + +static void print_rx_bd_flags(uint16_t flags) +{ + qemu_log(" Empty: %d\n", !!(flags & BD_RX_EMPTY)); + qemu_log(" Receive software ownership: %d\n", !!(flags & BD_RX_RO1)); + qemu_log(" Wrap: %d\n", !!(flags & BD_WRAP)); + qemu_log(" Interrupt: %d\n", !!(flags & BD_INTERRUPT)); + qemu_log(" Last in frame: %d\n", !!(flags & BD_LAST)); + qemu_log(" First in frame: %d\n", !!(flags & BD_RX_FIRST)); + qemu_log(" Miss: %d\n", !!(flags & BD_RX_MISS)); + qemu_log(" Broadcast: %d\n", !!(flags & BD_RX_BROADCAST)); + qemu_log(" Multicast: %d\n", !!(flags & BD_RX_MULTICAST)); + qemu_log(" Rx frame length violation: %d\n", !!(flags & BD_RX_LG)); + qemu_log(" Rx non-octet aligned frame: %d\n", !!(flags & BD_RX_NO)); + qemu_log(" Short frame: %d\n", !!(flags & BD_RX_SH)); + qemu_log(" Rx CRC Error: %d\n", !!(flags & BD_RX_CR)); + qemu_log(" Overrun: %d\n", !!(flags & BD_RX_OV)); + qemu_log(" Truncation: %d\n", !!(flags & BD_RX_TR)); +} + + +static void print_bd(eTSEC_rxtx_bd bd, int mode, uint32_t index) +{ + qemu_log("eTSEC %s Data Buffer Descriptor (%u)\n", + mode == eTSEC_TRANSMIT ? "Transmit" : "Receive", + index); + qemu_log(" Flags : 0x%04x\n", bd.flags); + if (mode == eTSEC_TRANSMIT) { + print_tx_bd_flags(bd.flags); + } else { + print_rx_bd_flags(bd.flags); + } + qemu_log(" Length : 0x%04x\n", bd.length); + qemu_log(" Pointer : 0x%08x\n", bd.bufptr); +} + +#endif /* DEBUG_BD */ + +static void read_buffer_descriptor(eTSEC *etsec, + hwaddr addr, + eTSEC_rxtx_bd *bd) +{ + assert(bd != NULL); + + RING_DEBUG("READ Buffer Descriptor @ 0x" TARGET_FMT_plx"\n", addr); + cpu_physical_memory_read(addr, + bd, + sizeof(eTSEC_rxtx_bd)); + + if (etsec->regs[DMACTRL].value & DMACTRL_LE) { + bd->flags = lduw_le_p(&bd->flags); + bd->length = lduw_le_p(&bd->length); + bd->bufptr = ldl_le_p(&bd->bufptr); + } else { + bd->flags = lduw_be_p(&bd->flags); + bd->length = lduw_be_p(&bd->length); + bd->bufptr = ldl_be_p(&bd->bufptr); + } +} + +static void write_buffer_descriptor(eTSEC *etsec, + hwaddr addr, + eTSEC_rxtx_bd *bd) +{ + assert(bd != NULL); + + if (etsec->regs[DMACTRL].value & DMACTRL_LE) { + stw_le_p(&bd->flags, bd->flags); + stw_le_p(&bd->length, bd->length); + stl_le_p(&bd->bufptr, bd->bufptr); + } else { + stw_be_p(&bd->flags, bd->flags); + stw_be_p(&bd->length, bd->length); + stl_be_p(&bd->bufptr, bd->bufptr); + } + + RING_DEBUG("Write Buffer Descriptor @ 0x" TARGET_FMT_plx"\n", addr); + cpu_physical_memory_write(addr, + bd, + sizeof(eTSEC_rxtx_bd)); +} + +static void ievent_set(eTSEC *etsec, + uint32_t flags) +{ + etsec->regs[IEVENT].value |= flags; + + if ((flags & IEVENT_TXB && etsec->regs[IMASK].value & IMASK_TXBEN) + || (flags & IEVENT_TXF && etsec->regs[IMASK].value & IMASK_TXFEN)) { + qemu_irq_raise(etsec->tx_irq); + RING_DEBUG("%s Raise Tx IRQ\n", __func__); + } + + if ((flags & IEVENT_RXB && etsec->regs[IMASK].value & IMASK_RXBEN) + || (flags & IEVENT_RXF && etsec->regs[IMASK].value & IMASK_RXFEN)) { + qemu_irq_raise(etsec->rx_irq); + RING_DEBUG("%s Raise Rx IRQ\n", __func__); + } +} + +static void tx_padding_and_crc(eTSEC *etsec, uint32_t min_frame_len) +{ + int add = min_frame_len - etsec->tx_buffer_len; + + /* Padding */ + if (add > 0) { + RING_DEBUG("pad:%u\n", add); + etsec->tx_buffer = g_realloc(etsec->tx_buffer, + etsec->tx_buffer_len + add); + + memset(etsec->tx_buffer + etsec->tx_buffer_len, 0x0, add); + etsec->tx_buffer_len += add; + } + + /* Never add CRC in QEMU */ +} + +static void process_tx_fcb(eTSEC *etsec) +{ + uint8_t flags = (uint8_t)(*etsec->tx_buffer); + /* L3 header offset from start of frame */ + uint8_t l3_header_offset = (uint8_t)*(etsec->tx_buffer + 3); + /* L4 header offset from start of L3 header */ + uint8_t l4_header_offset = (uint8_t)*(etsec->tx_buffer + 2); + /* L3 header */ + uint8_t *l3_header = etsec->tx_buffer + 8 + l3_header_offset; + /* L4 header */ + uint8_t *l4_header = l3_header + l4_header_offset; + + /* if packet is IP4 and IP checksum is requested */ + if (flags & FCB_TX_IP && flags & FCB_TX_CIP) { + /* do IP4 checksum (TODO This function does TCP/UDP checksum + * but not sure if it also does IP4 checksum.) */ + net_checksum_calculate(etsec->tx_buffer + 8, + etsec->tx_buffer_len - 8); + } + /* TODO Check the correct usage of the PHCS field of the FCB in case the NPH + * flag is on */ + + /* if packet is IP4 and TCP or UDP */ + if (flags & FCB_TX_IP && flags & FCB_TX_TUP) { + /* if UDP */ + if (flags & FCB_TX_UDP) { + /* if checksum is requested */ + if (flags & FCB_TX_CTU) { + /* do UDP checksum */ + + net_checksum_calculate(etsec->tx_buffer + 8, + etsec->tx_buffer_len - 8); + } else { + /* set checksum field to 0 */ + l4_header[6] = 0; + l4_header[7] = 0; + } + } else if (flags & FCB_TX_CTU) { /* if TCP and checksum is requested */ + /* do TCP checksum */ + net_checksum_calculate(etsec->tx_buffer + 8, + etsec->tx_buffer_len - 8); + } + } +} + +static void process_tx_bd(eTSEC *etsec, + eTSEC_rxtx_bd *bd) +{ + uint8_t *tmp_buff = NULL; + hwaddr tbdbth = (hwaddr)(etsec->regs[TBDBPH].value & 0xF) << 32; + + if (bd->length == 0) { + /* ERROR */ + return; + } + + if (etsec->tx_buffer_len == 0) { + /* It's the first BD */ + etsec->first_bd = *bd; + } + + /* TODO: if TxBD[TOE/UN] skip the Tx Frame Control Block*/ + + /* Load this Data Buffer */ + etsec->tx_buffer = g_realloc(etsec->tx_buffer, + etsec->tx_buffer_len + bd->length); + tmp_buff = etsec->tx_buffer + etsec->tx_buffer_len; + cpu_physical_memory_read(bd->bufptr + tbdbth, tmp_buff, bd->length); + + /* Update buffer length */ + etsec->tx_buffer_len += bd->length; + + + if (etsec->tx_buffer_len != 0 && (bd->flags & BD_LAST)) { + if (etsec->regs[MACCFG1].value & MACCFG1_TX_EN) { + /* MAC Transmit enabled */ + + /* Process offload Tx FCB */ + if (etsec->first_bd.flags & BD_TX_TOEUN) { + process_tx_fcb(etsec); + } + + if (etsec->first_bd.flags & BD_TX_PADCRC + || etsec->regs[MACCFG2].value & MACCFG2_PADCRC) { + + /* Padding and CRC (Padding implies CRC) */ + tx_padding_and_crc(etsec, 64); + + } else if (etsec->first_bd.flags & BD_TX_TC + || etsec->regs[MACCFG2].value & MACCFG2_CRC_EN) { + + /* Only CRC */ + /* Never add CRC in QEMU */ + } + +#if defined(HEX_DUMP) + qemu_log("eTSEC Send packet size:%d\n", etsec->tx_buffer_len); + qemu_hexdump(etsec->tx_buffer, stderr, "", etsec->tx_buffer_len); +#endif /* ETSEC_RING_DEBUG */ + + if (etsec->first_bd.flags & BD_TX_TOEUN) { + qemu_send_packet(qemu_get_queue(etsec->nic), + etsec->tx_buffer + 8, + etsec->tx_buffer_len - 8); + } else { + qemu_send_packet(qemu_get_queue(etsec->nic), + etsec->tx_buffer, + etsec->tx_buffer_len); + } + + } + + etsec->tx_buffer_len = 0; + + if (bd->flags & BD_INTERRUPT) { + ievent_set(etsec, IEVENT_TXF); + } + } else { + if (bd->flags & BD_INTERRUPT) { + ievent_set(etsec, IEVENT_TXB); + } + } + + /* Update DB flags */ + + /* Clear Ready */ + bd->flags &= ~BD_TX_READY; + + /* Clear Defer */ + bd->flags &= ~BD_TX_PREDEF; + + /* Clear Late Collision */ + bd->flags &= ~BD_TX_HFELC; + + /* Clear Retransmission Limit */ + bd->flags &= ~BD_TX_CFRL; + + /* Clear Retry Count */ + bd->flags &= ~(BD_TX_RC_MASK << BD_TX_RC_OFFSET); + + /* Clear Underrun */ + bd->flags &= ~BD_TX_TOEUN; + + /* Clear Truncation */ + bd->flags &= ~BD_TX_TR; +} + +void etsec_walk_tx_ring(eTSEC *etsec, int ring_nbr) +{ + hwaddr ring_base = 0; + hwaddr bd_addr = 0; + eTSEC_rxtx_bd bd; + uint16_t bd_flags; + + if (!(etsec->regs[MACCFG1].value & MACCFG1_TX_EN)) { + RING_DEBUG("%s: MAC Transmit not enabled\n", __func__); + return; + } + + ring_base = (hwaddr)(etsec->regs[TBASEH].value & 0xF) << 32; + ring_base += etsec->regs[TBASE0 + ring_nbr].value & ~0x7; + bd_addr = etsec->regs[TBPTR0 + ring_nbr].value & ~0x7; + + do { + read_buffer_descriptor(etsec, bd_addr, &bd); + +#ifdef DEBUG_BD + print_bd(bd, + eTSEC_TRANSMIT, + (bd_addr - ring_base) / sizeof(eTSEC_rxtx_bd)); + +#endif /* DEBUG_BD */ + + /* Save flags before BD update */ + bd_flags = bd.flags; + + if (bd_flags & BD_TX_READY) { + process_tx_bd(etsec, &bd); + + /* Write back BD after update */ + write_buffer_descriptor(etsec, bd_addr, &bd); + } + + /* Wrap or next BD */ + if (bd_flags & BD_WRAP) { + bd_addr = ring_base; + } else { + bd_addr += sizeof(eTSEC_rxtx_bd); + } + + } while (bd_addr != ring_base); + + bd_addr = ring_base; + + /* Save the Buffer Descriptor Pointers to current bd */ + etsec->regs[TBPTR0 + ring_nbr].value = bd_addr; + + /* Set transmit halt THLTx */ + etsec->regs[TSTAT].value |= 1 << (31 - ring_nbr); +} + +static void fill_rx_bd(eTSEC *etsec, + eTSEC_rxtx_bd *bd, + const uint8_t **buf, + size_t *size) +{ + uint16_t to_write; + hwaddr bufptr = bd->bufptr + + ((hwaddr)(etsec->regs[TBDBPH].value & 0xF) << 32); + uint8_t padd[etsec->rx_padding]; + uint8_t rem; + + RING_DEBUG("eTSEC fill Rx buffer @ 0x%016" HWADDR_PRIx + " size:%zu(padding + crc:%u) + fcb:%u\n", + bufptr, *size, etsec->rx_padding, etsec->rx_fcb_size); + + bd->length = 0; + + /* This operation will only write FCB */ + if (etsec->rx_fcb_size != 0) { + + cpu_physical_memory_write(bufptr, etsec->rx_fcb, etsec->rx_fcb_size); + + bufptr += etsec->rx_fcb_size; + bd->length += etsec->rx_fcb_size; + etsec->rx_fcb_size = 0; + + } + + /* We remove padding from the computation of to_write because it is not + * allocated in the buffer. + */ + to_write = MIN(*size - etsec->rx_padding, + etsec->regs[MRBLR].value - etsec->rx_fcb_size); + + /* This operation can only write packet data and no padding */ + if (to_write > 0) { + cpu_physical_memory_write(bufptr, *buf, to_write); + + *buf += to_write; + bufptr += to_write; + *size -= to_write; + + bd->flags &= ~BD_RX_EMPTY; + bd->length += to_write; + } + + if (*size == etsec->rx_padding) { + /* The remaining bytes are only for padding which is not actually + * allocated in the data buffer. + */ + + rem = MIN(etsec->regs[MRBLR].value - bd->length, etsec->rx_padding); + + if (rem > 0) { + memset(padd, 0x0, sizeof(padd)); + etsec->rx_padding -= rem; + *size -= rem; + bd->length += rem; + cpu_physical_memory_write(bufptr, padd, rem); + } + } +} + +static void rx_init_frame(eTSEC *etsec, const uint8_t *buf, size_t size) +{ + uint32_t fcb_size = 0; + uint8_t prsdep = (etsec->regs[RCTRL].value >> RCTRL_PRSDEP_OFFSET) + & RCTRL_PRSDEP_MASK; + + if (prsdep != 0) { + /* Prepend FCB (FCB size + RCTRL[PAL]) */ + fcb_size = 8 + ((etsec->regs[RCTRL].value >> 16) & 0x1F); + + etsec->rx_fcb_size = fcb_size; + + /* TODO: fill_FCB(etsec); */ + memset(etsec->rx_fcb, 0x0, sizeof(etsec->rx_fcb)); + + } else { + etsec->rx_fcb_size = 0; + } + + g_free(etsec->rx_buffer); + + /* Do not copy the frame for now */ + etsec->rx_buffer = (uint8_t *)buf; + etsec->rx_buffer_len = size; + + /* CRC padding (We don't have to compute the CRC) */ + etsec->rx_padding = 4; + + etsec->rx_first_in_frame = 1; + etsec->rx_remaining_data = etsec->rx_buffer_len; + RING_DEBUG("%s: rx_buffer_len:%u rx_padding+crc:%u\n", __func__, + etsec->rx_buffer_len, etsec->rx_padding); +} + +ssize_t etsec_rx_ring_write(eTSEC *etsec, const uint8_t *buf, size_t size) +{ + int ring_nbr = 0; /* Always use ring0 (no filer) */ + + if (etsec->rx_buffer_len != 0) { + RING_DEBUG("%s: We can't receive now," + " a buffer is already in the pipe\n", __func__); + return 0; + } + + if (etsec->regs[RSTAT].value & 1 << (23 - ring_nbr)) { + RING_DEBUG("%s: The ring is halted\n", __func__); + return -1; + } + + if (etsec->regs[DMACTRL].value & DMACTRL_GRS) { + RING_DEBUG("%s: Graceful receive stop\n", __func__); + return -1; + } + + if (!(etsec->regs[MACCFG1].value & MACCFG1_RX_EN)) { + RING_DEBUG("%s: MAC Receive not enabled\n", __func__); + return -1; + } + + if ((etsec->regs[RCTRL].value & RCTRL_RSF) && (size < 60)) { + /* CRC is not in the packet yet, so short frame is below 60 bytes */ + RING_DEBUG("%s: Drop short frame\n", __func__); + return -1; + } + + rx_init_frame(etsec, buf, size); + + etsec_walk_rx_ring(etsec, ring_nbr); + + return size; +} + +void etsec_walk_rx_ring(eTSEC *etsec, int ring_nbr) +{ + hwaddr ring_base = 0; + hwaddr bd_addr = 0; + hwaddr start_bd_addr = 0; + eTSEC_rxtx_bd bd; + uint16_t bd_flags; + size_t remaining_data; + const uint8_t *buf; + uint8_t *tmp_buf; + size_t size; + + if (etsec->rx_buffer_len == 0) { + /* No frame to send */ + RING_DEBUG("No frame to send\n"); + return; + } + + remaining_data = etsec->rx_remaining_data + etsec->rx_padding; + buf = etsec->rx_buffer + + (etsec->rx_buffer_len - etsec->rx_remaining_data); + size = etsec->rx_buffer_len + etsec->rx_padding; + + ring_base = (hwaddr)(etsec->regs[RBASEH].value & 0xF) << 32; + ring_base += etsec->regs[RBASE0 + ring_nbr].value & ~0x7; + start_bd_addr = bd_addr = etsec->regs[RBPTR0 + ring_nbr].value & ~0x7; + + do { + read_buffer_descriptor(etsec, bd_addr, &bd); + +#ifdef DEBUG_BD + print_bd(bd, + eTSEC_RECEIVE, + (bd_addr - ring_base) / sizeof(eTSEC_rxtx_bd)); + +#endif /* DEBUG_BD */ + + /* Save flags before BD update */ + bd_flags = bd.flags; + + if (bd_flags & BD_RX_EMPTY) { + fill_rx_bd(etsec, &bd, &buf, &remaining_data); + + if (etsec->rx_first_in_frame) { + bd.flags |= BD_RX_FIRST; + etsec->rx_first_in_frame = 0; + etsec->rx_first_bd = bd; + } + + /* Last in frame */ + if (remaining_data == 0) { + + /* Clear flags */ + + bd.flags &= ~0x7ff; + + bd.flags |= BD_LAST; + + /* NOTE: non-octet aligned frame is impossible in qemu */ + + if (size >= etsec->regs[MAXFRM].value) { + /* frame length violation */ + qemu_log("%s frame length violation: size:%zu MAXFRM:%d\n", + __func__, size, etsec->regs[MAXFRM].value); + + bd.flags |= BD_RX_LG; + } + + if (size < 64) { + /* Short frame */ + bd.flags |= BD_RX_SH; + } + + /* TODO: Broadcast and Multicast */ + + if (bd.flags & BD_INTERRUPT) { + /* Set RXFx */ + etsec->regs[RSTAT].value |= 1 << (7 - ring_nbr); + + /* Set IEVENT */ + ievent_set(etsec, IEVENT_RXF); + } + + } else { + if (bd.flags & BD_INTERRUPT) { + /* Set IEVENT */ + ievent_set(etsec, IEVENT_RXB); + } + } + + /* Write back BD after update */ + write_buffer_descriptor(etsec, bd_addr, &bd); + } + + /* Wrap or next BD */ + if (bd_flags & BD_WRAP) { + bd_addr = ring_base; + } else { + bd_addr += sizeof(eTSEC_rxtx_bd); + } + } while (remaining_data != 0 + && (bd_flags & BD_RX_EMPTY) + && bd_addr != start_bd_addr); + + /* Reset ring ptr */ + etsec->regs[RBPTR0 + ring_nbr].value = bd_addr; + + /* The frame is too large to fit in the Rx ring */ + if (remaining_data > 0) { + + /* Set RSTAT[QHLTx] */ + etsec->regs[RSTAT].value |= 1 << (23 - ring_nbr); + + /* Save remaining data to send the end of the frame when the ring will + * be restarted + */ + etsec->rx_remaining_data = remaining_data; + + /* Copy the frame */ + tmp_buf = g_malloc(size); + memcpy(tmp_buf, etsec->rx_buffer, size); + etsec->rx_buffer = tmp_buf; + + RING_DEBUG("no empty RxBD available any more\n"); + } else { + etsec->rx_buffer_len = 0; + etsec->rx_buffer = NULL; + if (etsec->need_flush) { + qemu_flush_queued_packets(qemu_get_queue(etsec->nic)); + } + } + + RING_DEBUG("eTSEC End of ring_write: remaining_data:%zu\n", remaining_data); +} |
