diff options
| -rw-r--r-- | hw/rtl8139.c | 66 |
1 files changed, 52 insertions, 14 deletions
diff --git a/hw/rtl8139.c b/hw/rtl8139.c index d843aa0..5b2f489 100644 --- a/hw/rtl8139.c +++ b/hw/rtl8139.c @@ -72,6 +72,16 @@ #define MOD2(input, size) \ ( ( input ) & ( size - 1 ) ) +#define ETHER_ADDR_LEN 6 +#define ETHER_TYPE_LEN 2 +#define ETH_HLEN (ETHER_ADDR_LEN * 2 + ETHER_TYPE_LEN) +#define ETH_P_IP 0x0800 /* Internet Protocol packet */ +#define ETH_P_8021Q 0x8100 /* 802.1Q VLAN Extended Header */ +#define ETH_MTU 1500 + +#define VLAN_TCI_LEN 2 +#define VLAN_HLEN (ETHER_TYPE_LEN + VLAN_TCI_LEN) + #if defined (DEBUG_RTL8139) # define DEBUG_PRINT(x) do { printf x ; } while (0) #else @@ -812,11 +822,13 @@ static int rtl8139_can_receive(VLANClientState *nc) static ssize_t rtl8139_do_receive(VLANClientState *nc, const uint8_t *buf, size_t size_, int do_interrupt) { RTL8139State *s = DO_UPCAST(NICState, nc, nc)->opaque; + /* size is the length of the buffer passed to the driver */ int size = size_; + const uint8_t *dot1q_buf = NULL; uint32_t packet_header = 0; - uint8_t buf1[60]; + uint8_t buf1[MIN_BUF_SIZE + VLAN_HLEN]; static const uint8_t broadcast_macaddr[6] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; @@ -928,12 +940,15 @@ static ssize_t rtl8139_do_receive(VLANClientState *nc, const uint8_t *buf, size_ } } - /* if too small buffer, then expand it */ - if (size < MIN_BUF_SIZE) { + /* if too small buffer, then expand it + * Include some tailroom in case a vlan tag is later removed. */ + if (size < MIN_BUF_SIZE + VLAN_HLEN) { memcpy(buf1, buf, size); - memset(buf1 + size, 0, MIN_BUF_SIZE - size); + memset(buf1 + size, 0, MIN_BUF_SIZE + VLAN_HLEN - size); buf = buf1; - size = MIN_BUF_SIZE; + if (size < MIN_BUF_SIZE) { + size = MIN_BUF_SIZE; + } } if (rtl8139_cp_receiver_enabled(s)) @@ -996,6 +1011,29 @@ static ssize_t rtl8139_do_receive(VLANClientState *nc, const uint8_t *buf, size_ uint32_t rx_space = rxdw0 & CP_RX_BUFFER_SIZE_MASK; + /* write VLAN info to descriptor variables. */ + if (s->CpCmd & CPlusRxVLAN && be16_to_cpup((uint16_t *) + &buf[ETHER_ADDR_LEN * 2]) == ETH_P_8021Q) { + dot1q_buf = &buf[ETHER_ADDR_LEN * 2]; + size -= VLAN_HLEN; + /* if too small buffer, use the tailroom added duing expansion */ + if (size < MIN_BUF_SIZE) { + size = MIN_BUF_SIZE; + } + + rxdw1 &= ~CP_RX_VLAN_TAG_MASK; + /* BE + ~le_to_cpu()~ + cpu_to_le() = BE */ + rxdw1 |= CP_RX_TAVA | le16_to_cpup((uint16_t *) + &dot1q_buf[ETHER_TYPE_LEN]); + + DEBUG_PRINT(("RTL8139: C+ Rx mode : extracted vlan tag with tci: " + "%u\n", be16_to_cpup((uint16_t *) + &dot1q_buf[ETHER_TYPE_LEN]))); + } else { + /* reset VLAN tag flag */ + rxdw1 &= ~CP_RX_TAVA; + } + /* TODO: scatter the packet over available receive ring descriptors space */ if (size+4 > rx_space) @@ -1017,7 +1055,14 @@ static ssize_t rtl8139_do_receive(VLANClientState *nc, const uint8_t *buf, size_ target_phys_addr_t rx_addr = rtl8139_addr64(rxbufLO, rxbufHI); /* receive/copy to target memory */ - cpu_physical_memory_write( rx_addr, buf, size ); + if (dot1q_buf) { + cpu_physical_memory_write(rx_addr, buf, 2 * ETHER_ADDR_LEN); + cpu_physical_memory_write(rx_addr + 2 * ETHER_ADDR_LEN, + buf + 2 * ETHER_ADDR_LEN + VLAN_HLEN, + size - 2 * ETHER_ADDR_LEN); + } else { + cpu_physical_memory_write(rx_addr, buf, size); + } if (s->CpCmd & CPlusRxChkSum) { @@ -1025,7 +1070,7 @@ static ssize_t rtl8139_do_receive(VLANClientState *nc, const uint8_t *buf, size_ } /* write checksum */ - val = cpu_to_le32(crc32(0, buf, size)); + val = cpu_to_le32(crc32(0, buf, size_)); cpu_physical_memory_write( rx_addr+size, (uint8_t *)&val, 4); /* first segment of received packet flag */ @@ -1070,9 +1115,6 @@ static ssize_t rtl8139_do_receive(VLANClientState *nc, const uint8_t *buf, size_ rxdw0 &= ~CP_RX_BUFFER_SIZE_MASK; rxdw0 |= (size+4); - /* reset VLAN tag flag */ - rxdw1 &= ~CP_RX_TAVA; - /* update ring data */ val = cpu_to_le32(rxdw0); cpu_physical_memory_write(cplus_rx_ring_desc, (uint8_t *)&val, 4); @@ -2054,10 +2096,6 @@ static int rtl8139_cplus_transmit_one(RTL8139State *s) { DEBUG_PRINT(("RTL8139: +++ C+ mode offloaded task checksum\n")); - #define ETH_P_IP 0x0800 /* Internet Protocol packet */ - #define ETH_HLEN 14 - #define ETH_MTU 1500 - /* ip packet header */ ip_header *ip = NULL; int hlen = 0; |