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rtl8139: add vlan tag insertion

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Add support to the emulated hardware to insert vlan tags in packets
going from the guest to the network.

Signed-off-by: Benjamin 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>
Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
This commit is contained in:
Benjamin Poirier 2011-03-22 19:11:23 -04:00 committed by Blue Swirl
parent 18dabfd1e0
commit bf6b87a883
1 changed files with 60 additions and 15 deletions
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75
hw/rtl8139.c
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@ -45,6 +45,7 @@
* 2010-Feb-04 Frediano Ziglio: Rewrote timer support using QEMU timer only
* when strictly needed (required for for
* Darwin)
* 2011-Mar-22 Benjamin Poirier: Implemented VLAN offloading
*/
/* For crc32 */
@ -56,6 +57,7 @@
#include "net.h"
#include "loader.h"
#include "sysemu.h"
#include "iov.h"
/* debug RTL8139 card */
//#define DEBUG_RTL8139 1
@ -1756,22 +1758,52 @@ static uint32_t rtl8139_RxConfig_read(RTL8139State *s)
return ret;
}
static void rtl8139_transfer_frame(RTL8139State *s, const uint8_t *buf, int size, int do_interrupt)
static void rtl8139_transfer_frame(RTL8139State *s, uint8_t *buf, int size,
int do_interrupt, const uint8_t *dot1q_buf)
{
struct iovec *iov = NULL;
if (!size)
{
DEBUG_PRINT(("RTL8139: +++ empty ethernet frame\n"));
return;
}
if (dot1q_buf && size >= ETHER_ADDR_LEN * 2) {
iov = (struct iovec[3]) {
{ .iov_base = buf, .iov_len = ETHER_ADDR_LEN * 2 },
{ .iov_base = (void *) dot1q_buf, .iov_len = VLAN_HLEN },
{ .iov_base = buf + ETHER_ADDR_LEN * 2,
.iov_len = size - ETHER_ADDR_LEN * 2 },
};
}
if (TxLoopBack == (s->TxConfig & TxLoopBack))
{
size_t buf2_size;
uint8_t *buf2;
if (iov) {
buf2_size = iov_size(iov, 3);
buf2 = qemu_malloc(buf2_size);
iov_to_buf(iov, 3, buf2, 0, buf2_size);
buf = buf2;
}
DEBUG_PRINT(("RTL8139: +++ transmit loopback mode\n"));
rtl8139_do_receive(&s->nic->nc, buf, size, do_interrupt);
if (iov) {
qemu_free(buf2);
}
}
else
{
qemu_send_packet(&s->nic->nc, buf, size);
if (iov) {
qemu_sendv_packet(&s->nic->nc, iov, 3);
} else {
qemu_send_packet(&s->nic->nc, buf, size);
}
}
}
@ -1805,7 +1837,7 @@ static int rtl8139_transmit_one(RTL8139State *s, int descriptor)
s->TxStatus[descriptor] |= TxHostOwns;
s->TxStatus[descriptor] |= TxStatOK;
rtl8139_transfer_frame(s, txbuffer, txsize, 0);
rtl8139_transfer_frame(s, txbuffer, txsize, 0, NULL);
DEBUG_PRINT(("RTL8139: +++ transmitted %d bytes from descriptor %d\n", txsize, descriptor));
@ -1932,7 +1964,6 @@ static int rtl8139_cplus_transmit_one(RTL8139State *s)
cpu_physical_memory_read(cplus_tx_ring_desc, (uint8_t *)&val, 4);
txdw0 = le32_to_cpu(val);
/* TODO: implement VLAN tagging support, VLAN tag data is read to txdw1 */
cpu_physical_memory_read(cplus_tx_ring_desc+4, (uint8_t *)&val, 4);
txdw1 = le32_to_cpu(val);
cpu_physical_memory_read(cplus_tx_ring_desc+8, (uint8_t *)&val, 4);
@ -1944,9 +1975,6 @@ static int rtl8139_cplus_transmit_one(RTL8139State *s)
descriptor,
txdw0, txdw1, txbufLO, txbufHI));
/* TODO: the following discard cast should clean clang analyzer output */
(void)txdw1;
/* w0 ownership flag */
#define CP_TX_OWN (1<<31)
/* w0 end of ring flag */
@ -1970,9 +1998,9 @@ static int rtl8139_cplus_transmit_one(RTL8139State *s)
/* w0 bits 0...15 : buffer size */
#define CP_TX_BUFFER_SIZE (1<<16)
#define CP_TX_BUFFER_SIZE_MASK (CP_TX_BUFFER_SIZE - 1)
/* w1 tag available flag */
#define CP_RX_TAGC (1<<17)
/* w1 bits 0...15 : VLAN tag */
/* w1 add tag flag */
#define CP_TX_TAGC (1<<17)
/* w1 bits 0...15 : VLAN tag (big endian) */
#define CP_TX_VLAN_TAG_MASK ((1<<16) - 1)
/* w2 low 32bit of Rx buffer ptr */
/* w3 high 32bit of Rx buffer ptr */
@ -2072,13 +2100,13 @@ static int rtl8139_cplus_transmit_one(RTL8139State *s)
/* update ring data */
val = cpu_to_le32(txdw0);
cpu_physical_memory_write(cplus_tx_ring_desc, (uint8_t *)&val, 4);
/* TODO: implement VLAN tagging support, VLAN tag data is read to txdw1 */
// val = cpu_to_le32(txdw1);
// cpu_physical_memory_write(cplus_tx_ring_desc+4, &val, 4);
/* Now decide if descriptor being processed is holding the last segment of packet */
if (txdw0 & CP_TX_LS)
{
uint8_t dot1q_buffer_space[VLAN_HLEN];
uint16_t *dot1q_buffer;
DEBUG_PRINT(("RTL8139: +++ C+ Tx mode : descriptor %d is last segment descriptor\n", descriptor));
/* can transfer fully assembled packet */
@ -2087,6 +2115,21 @@ static int rtl8139_cplus_transmit_one(RTL8139State *s)
int saved_size = s->cplus_txbuffer_offset;
int saved_buffer_len = s->cplus_txbuffer_len;
/* create vlan tag */
if (txdw1 & CP_TX_TAGC) {
/* the vlan tag is in BE byte order in the descriptor
* BE + le_to_cpu() + ~swap()~ = cpu */
DEBUG_PRINT(("RTL8139: +++ C+ Tx mode : inserting vlan tag with "
"tci: %u\n", bswap16(txdw1 & CP_TX_VLAN_TAG_MASK)));
dot1q_buffer = (uint16_t *) dot1q_buffer_space;
dot1q_buffer[0] = cpu_to_be16(ETH_P_8021Q);
/* BE + le_to_cpu() + ~cpu_to_le()~ = BE */
dot1q_buffer[1] = cpu_to_le16(txdw1 & CP_TX_VLAN_TAG_MASK);
} else {
dot1q_buffer = NULL;
}
/* reset the card space to protect from recursive call */
s->cplus_txbuffer = NULL;
s->cplus_txbuffer_offset = 0;
@ -2240,7 +2283,8 @@ static int rtl8139_cplus_transmit_one(RTL8139State *s)
int tso_send_size = ETH_HLEN + hlen + tcp_hlen + chunk_size;
DEBUG_PRINT(("RTL8139: +++ C+ mode TSO transferring packet size %d\n", tso_send_size));
rtl8139_transfer_frame(s, saved_buffer, tso_send_size, 0);
rtl8139_transfer_frame(s, saved_buffer, tso_send_size,
0, (uint8_t *) dot1q_buffer);
/* add transferred count to TCP sequence number */
p_tcp_hdr->th_seq = cpu_to_be32(chunk_size + be32_to_cpu(p_tcp_hdr->th_seq));
@ -2313,7 +2357,8 @@ static int rtl8139_cplus_transmit_one(RTL8139State *s)
DEBUG_PRINT(("RTL8139: +++ C+ mode transmitting %d bytes packet\n", saved_size));
rtl8139_transfer_frame(s, saved_buffer, saved_size, 1);
rtl8139_transfer_frame(s, saved_buffer, saved_size, 1,
(uint8_t *) dot1q_buffer);
/* restore card space if there was no recursion and reset offset */
if (!s->cplus_txbuffer)