Commit 18dabfd1 authored by Benjamin Poirier's avatar Benjamin Poirier Committed by Blue Swirl
Browse files

rtl8139: add vlan tag extraction



Add support to the emulated hardware to extract vlan tags in packets
going from the network to the guest.
Signed-off-by: default avatarBenjamin Poirier <benjamin.poirier@gmail.com>
Cc: Igor V. Kovalenko <igor.v.kovalenko@gmail.com>
Cc: Jason Wang <jasowang@redhat.com>
Cc: Michael S. Tsirkin <mst@redhat.com>
Cc: Blue Swirl <blauwirbel@gmail.com>

--

AFAIK, extraction is optional to get vlans working. The driver
requests rx detagging but should not assume that it was done. Under
Linux, the mac layer will catch the vlan ethertype. I only added this
part for completeness (to emulate the hardware more truthfully...)
Signed-off-by: default avatarBlue Swirl <blauwirbel@gmail.com>
parent 2c406b8f
......@@ -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;
......
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