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fixed for TCP segmentation offloading - removed dependency on slirp.h (Igor Kovalenko)

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git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@2046 c046a42c-6fe2-441c-8c8c-71466251a162
This commit is contained in:
bellard 2006-07-10 21:38:17 +00:00
parent 0de6bb73fd
commit 718da2b9b0
1 changed files with 271 additions and 70 deletions
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337
hw/rtl8139.c
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@ -33,13 +33,18 @@
* Implemented PCI timer interrupt (disabled by default) * Implemented PCI timer interrupt (disabled by default)
* Implemented Tally Counters, increased VM load/save version * Implemented Tally Counters, increased VM load/save version
* Implemented IP/TCP/UDP checksum task offloading * Implemented IP/TCP/UDP checksum task offloading
*
* 2006-Jul-04 Igor Kovalenko : Implemented TCP segmentation offloading
* Fixed MTU=1500 for produced ethernet frames
*
* 2006-Jul-09 Igor Kovalenko : Fixed TCP header length calculation while processing
* segmentation offloading
* Removed slirp.h dependency
* Added rx/tx buffer reset when enabling rx/tx operation
*/ */
#include "vl.h" #include "vl.h"
/* XXX: such dependency must be suppressed */
#include <slirp/slirp.h>
/* debug RTL8139 card */ /* debug RTL8139 card */
//#define DEBUG_RTL8139 1 //#define DEBUG_RTL8139 1
@ -1364,10 +1369,14 @@ static void rtl8139_ChipCmd_write(RTL8139State *s, uint32_t val)
if (val & CmdRxEnb) if (val & CmdRxEnb)
{ {
DEBUG_PRINT(("RTL8139: ChipCmd enable receiver\n")); DEBUG_PRINT(("RTL8139: ChipCmd enable receiver\n"));
s->currCPlusRxDesc = 0;
} }
if (val & CmdTxEnb) if (val & CmdTxEnb)
{ {
DEBUG_PRINT(("RTL8139: ChipCmd enable transmitter\n")); DEBUG_PRINT(("RTL8139: ChipCmd enable transmitter\n"));
s->currCPlusTxDesc = 0;
} }
/* mask unwriteable bits */ /* mask unwriteable bits */
@ -1732,6 +1741,25 @@ static uint32_t rtl8139_RxConfig_read(RTL8139State *s)
return ret; return ret;
} }
static void rtl8139_transfer_frame(RTL8139State *s, const uint8_t *buf, int size, int do_interrupt)
{
if (!size)
{
DEBUG_PRINT(("RTL8139: +++ empty ethernet frame\n"));
return;
}
if (TxLoopBack == (s->TxConfig & TxLoopBack))
{
DEBUG_PRINT(("RTL8139: +++ transmit loopback mode\n"));
rtl8139_do_receive(s, buf, size, do_interrupt);
}
else
{
qemu_send_packet(s->vc, buf, size);
}
}
static int rtl8139_transmit_one(RTL8139State *s, int descriptor) static int rtl8139_transmit_one(RTL8139State *s, int descriptor)
{ {
if (!rtl8139_transmitter_enabled(s)) if (!rtl8139_transmitter_enabled(s))
@ -1762,15 +1790,7 @@ static int rtl8139_transmit_one(RTL8139State *s, int descriptor)
s->TxStatus[descriptor] |= TxHostOwns; s->TxStatus[descriptor] |= TxHostOwns;
s->TxStatus[descriptor] |= TxStatOK; s->TxStatus[descriptor] |= TxStatOK;
if (TxLoopBack == (s->TxConfig & TxLoopBack)) rtl8139_transfer_frame(s, txbuffer, txsize, 0);
{
DEBUG_PRINT(("RTL8139: +++ transmit loopback mode\n"));
rtl8139_do_receive(s, txbuffer, txsize, 0);
}
else
{
qemu_send_packet(s->vc, txbuffer, txsize);
}
DEBUG_PRINT(("RTL8139: +++ transmitted %d bytes from descriptor %d\n", txsize, descriptor)); DEBUG_PRINT(("RTL8139: +++ transmitted %d bytes from descriptor %d\n", txsize, descriptor));
@ -1781,6 +1801,93 @@ static int rtl8139_transmit_one(RTL8139State *s, int descriptor)
return 1; return 1;
} }
/* structures and macros for task offloading */
typedef struct ip_header
{
uint8_t ip_ver_len; /* version and header length */
uint8_t ip_tos; /* type of service */
uint16_t ip_len; /* total length */
uint16_t ip_id; /* identification */
uint16_t ip_off; /* fragment offset field */
uint8_t ip_ttl; /* time to live */
uint8_t ip_p; /* protocol */
uint16_t ip_sum; /* checksum */
uint32_t ip_src,ip_dst; /* source and dest address */
} ip_header;
#define IP_HEADER_VERSION_4 4
#define IP_HEADER_VERSION(ip) ((ip->ip_ver_len >> 4)&0xf)
#define IP_HEADER_LENGTH(ip) (((ip->ip_ver_len)&0xf) << 2)
typedef struct tcp_header
{
uint16_t th_sport; /* source port */
uint16_t th_dport; /* destination port */
uint32_t th_seq; /* sequence number */
uint32_t th_ack; /* acknowledgement number */
uint16_t th_offset_flags; /* data offset, reserved 6 bits, TCP protocol flags */
uint16_t th_win; /* window */
uint16_t th_sum; /* checksum */
uint16_t th_urp; /* urgent pointer */
} tcp_header;
typedef struct udp_header
{
uint16_t uh_sport; /* source port */
uint16_t uh_dport; /* destination port */
uint16_t uh_ulen; /* udp length */
uint16_t uh_sum; /* udp checksum */
} udp_header;
typedef struct ip_pseudo_header
{
uint32_t ip_src;
uint32_t ip_dst;
uint8_t zeros;
uint8_t ip_proto;
uint16_t ip_payload;
} ip_pseudo_header;
#define IP_PROTO_TCP 6
#define IP_PROTO_UDP 17
#define TCP_HEADER_DATA_OFFSET(tcp) (((be16_to_cpu(tcp->th_offset_flags) >> 12)&0xf) << 2)
#define TCP_FLAGS_ONLY(flags) ((flags)&0x3f)
#define TCP_HEADER_FLAGS(tcp) TCP_FLAGS_ONLY(be16_to_cpu(tcp->th_offset_flags))
#define TCP_HEADER_CLEAR_FLAGS(tcp, off) ((tcp)->th_offset_flags &= cpu_to_be16(~TCP_FLAGS_ONLY(off)))
#define TCP_FLAG_FIN 0x01
#define TCP_FLAG_PUSH 0x08
/* produces ones' complement sum of data */
static uint16_t ones_complement_sum(uint8_t *data, size_t len)
{
uint32_t result = 0;
for (; len > 1; data+=2, len-=2)
{
result += *(uint16_t*)data;
}
/* add the remainder byte */
if (len)
{
uint8_t odd[2] = {*data, 0};
result += *(uint16_t*)odd;
}
while (result>>16)
result = (result & 0xffff) + (result >> 16);
return result;
}
static uint16_t ip_checksum(void *data, size_t len)
{
return ~ones_complement_sum((uint8_t*)data, len);
}
static int rtl8139_cplus_transmit_one(RTL8139State *s) static int rtl8139_cplus_transmit_one(RTL8139State *s)
{ {
if (!rtl8139_transmitter_enabled(s)) if (!rtl8139_transmitter_enabled(s))
@ -1831,6 +1938,9 @@ static int rtl8139_cplus_transmit_one(RTL8139State *s)
#define CP_TX_LS (1<<28) #define CP_TX_LS (1<<28)
/* large send packet flag */ /* large send packet flag */
#define CP_TX_LGSEN (1<<27) #define CP_TX_LGSEN (1<<27)
/* large send MSS mask, bits 16...25 */
#define CP_TC_LGSEN_MSS_MASK ((1 << 12) - 1)
/* IP checksum offload flag */ /* IP checksum offload flag */
#define CP_TX_IPCS (1<<18) #define CP_TX_IPCS (1<<18)
/* UDP checksum offload flag */ /* UDP checksum offload flag */
@ -1885,6 +1995,8 @@ static int rtl8139_cplus_transmit_one(RTL8139State *s)
s->cplus_txbuffer_len = CP_TX_BUFFER_SIZE; s->cplus_txbuffer_len = CP_TX_BUFFER_SIZE;
s->cplus_txbuffer = malloc(s->cplus_txbuffer_len); s->cplus_txbuffer = malloc(s->cplus_txbuffer_len);
s->cplus_txbuffer_offset = 0; s->cplus_txbuffer_offset = 0;
DEBUG_PRINT(("RTL8139: +++ C+ mode transmission buffer allocated space %d\n", s->cplus_txbuffer_len));
} }
while (s->cplus_txbuffer && s->cplus_txbuffer_offset + txsize >= s->cplus_txbuffer_len) while (s->cplus_txbuffer && s->cplus_txbuffer_offset + txsize >= s->cplus_txbuffer_len)
@ -1960,35 +2072,41 @@ static int rtl8139_cplus_transmit_one(RTL8139State *s)
s->cplus_txbuffer_offset = 0; s->cplus_txbuffer_offset = 0;
s->cplus_txbuffer_len = 0; s->cplus_txbuffer_len = 0;
if (txdw0 & (CP_TX_IPCS | CP_TX_UDPCS | CP_TX_TCPCS)) if (txdw0 & (CP_TX_IPCS | CP_TX_UDPCS | CP_TX_TCPCS | CP_TX_LGSEN))
{ {
DEBUG_PRINT(("RTL8139: +++ C+ mode offloaded task checksum\n")); DEBUG_PRINT(("RTL8139: +++ C+ mode offloaded task checksum\n"));
#define ETH_P_IP 0x0800 /* Internet Protocol packet */ #define ETH_P_IP 0x0800 /* Internet Protocol packet */
#define ETH_HLEN 14 #define ETH_HLEN 14
#define ETH_MTU 1500
/* ip packet header */ /* ip packet header */
register struct ip *ip = 0; ip_header *ip = 0;
int hlen = 0; int hlen = 0;
uint8_t ip_protocol = 0;
uint16_t ip_data_len = 0;
struct mbuf local_m; uint8_t *eth_payload_data = 0;
size_t eth_payload_len = 0;
int proto = ntohs(*(uint16_t *)(saved_buffer + 12)); int proto = be16_to_cpu(*(uint16_t *)(saved_buffer + 12));
if (proto == ETH_P_IP) if (proto == ETH_P_IP)
{ {
DEBUG_PRINT(("RTL8139: +++ C+ mode has IP packet\n")); DEBUG_PRINT(("RTL8139: +++ C+ mode has IP packet\n"));
/* not aligned */ /* not aligned */
local_m.m_data = saved_buffer + ETH_HLEN; eth_payload_data = saved_buffer + ETH_HLEN;
local_m.m_len = saved_size - ETH_HLEN; eth_payload_len = saved_size - ETH_HLEN;
ip = mtod(&local_m, struct ip *); ip = (ip_header*)eth_payload_data;
if (ip->ip_v != IPVERSION) { if (IP_HEADER_VERSION(ip) != IP_HEADER_VERSION_4) {
DEBUG_PRINT(("RTL8139: +++ C+ mode packet has bad IP version %d expected %d\n", ip->ip_v, IPVERSION)); DEBUG_PRINT(("RTL8139: +++ C+ mode packet has bad IP version %d expected %d\n", IP_HEADER_VERSION(ip), IP_HEADER_VERSION_4));
ip = NULL; ip = NULL;
} else { } else {
hlen = ip->ip_hl << 2; hlen = IP_HEADER_LENGTH(ip);
ip_protocol = ip->ip_p;
ip_data_len = be16_to_cpu(ip->ip_len) - hlen;
} }
} }
@ -1998,84 +2116,178 @@ static int rtl8139_cplus_transmit_one(RTL8139State *s)
{ {
DEBUG_PRINT(("RTL8139: +++ C+ mode need IP checksum\n")); DEBUG_PRINT(("RTL8139: +++ C+ mode need IP checksum\n"));
if (hlen<sizeof(struct ip ) || hlen>local_m.m_len) {/* min header length */ if (hlen<sizeof(ip_header) || hlen>eth_payload_len) {/* min header length */
/* bad packet header len */ /* bad packet header len */
/* or packet too short */ /* or packet too short */
} }
else else
{ {
ip->ip_sum = 0; ip->ip_sum = 0;
ip->ip_sum = cksum(&local_m, hlen); ip->ip_sum = ip_checksum(ip, hlen);
DEBUG_PRINT(("RTL8139: +++ C+ mode IP header len=%d checksum=%04x\n", hlen, ip->ip_sum)); DEBUG_PRINT(("RTL8139: +++ C+ mode IP header len=%d checksum=%04x\n", hlen, ip->ip_sum));
} }
} }
if (txdw0 & (CP_TX_TCPCS|CP_TX_UDPCS)) if ((txdw0 & CP_TX_LGSEN) && ip_protocol == IP_PROTO_TCP)
{ {
DEBUG_PRINT(("RTL8139: +++ C+ mode need TCP or UDP checksum\n")); #if defined (DEBUG_RTL8139)
int large_send_mss = (txdw0 >> 16) & CP_TC_LGSEN_MSS_MASK;
#endif
DEBUG_PRINT(("RTL8139: +++ C+ mode offloaded task TSO MTU=%d IP data %d frame data %d specified MSS=%d\n",
ETH_MTU, ip_data_len, saved_size - ETH_HLEN, large_send_mss));
u_int8_t ip_protocol = ip->ip_p; int tcp_send_offset = 0;
u_int16_t ip_data_len = ntohs(ip->ip_len) - hlen; int send_count = 0;
/* maximum IP header length is 60 bytes */ /* maximum IP header length is 60 bytes */
uint8_t saved_ip_header[60]; uint8_t saved_ip_header[60];
memcpy(saved_ip_header, local_m.m_data, hlen);
struct mbuf local_checksum_m; /* save IP header template; data area is used in tcp checksum calculation */
memcpy(saved_ip_header, eth_payload_data, hlen);
local_checksum_m.m_data = local_m.m_data + hlen - 12; /* a placeholder for checksum calculation routine in tcp case */
local_checksum_m.m_len = local_m.m_len - hlen + 12; uint8_t *data_to_checksum = eth_payload_data + hlen - 12;
// size_t data_to_checksum_len = eth_payload_len - hlen + 12;
/* pointer to TCP header */
tcp_header *p_tcp_hdr = (tcp_header*)(eth_payload_data + hlen);
int tcp_hlen = TCP_HEADER_DATA_OFFSET(p_tcp_hdr);
/* ETH_MTU = ip header len + tcp header len + payload */
int tcp_data_len = ip_data_len - tcp_hlen;
int tcp_chunk_size = ETH_MTU - hlen - tcp_hlen;
DEBUG_PRINT(("RTL8139: +++ C+ mode TSO IP data len %d TCP hlen %d TCP data len %d TCP chunk size %d\n",
ip_data_len, tcp_hlen, tcp_data_len, tcp_chunk_size));
/* note the cycle below overwrites IP header data,
but restores it from saved_ip_header before sending packet */
int is_last_frame = 0;
for (tcp_send_offset = 0; tcp_send_offset < tcp_data_len; tcp_send_offset += tcp_chunk_size)
{
uint16_t chunk_size = tcp_chunk_size;
/* check if this is the last frame */
if (tcp_send_offset + tcp_chunk_size >= tcp_data_len)
{
is_last_frame = 1;
chunk_size = tcp_data_len - tcp_send_offset;
}
DEBUG_PRINT(("RTL8139: +++ C+ mode TSO TCP seqno %08x\n", be32_to_cpu(p_tcp_hdr->th_seq)));
/* add 4 TCP pseudoheader fields */ /* add 4 TCP pseudoheader fields */
/* copy IP source and destination fields */ /* copy IP source and destination fields */
memcpy(local_checksum_m.m_data, saved_ip_header + 12, 8); memcpy(data_to_checksum, saved_ip_header + 12, 8);
if ((txdw0 & CP_TX_TCPCS) && ip_protocol == IPPROTO_TCP) DEBUG_PRINT(("RTL8139: +++ C+ mode TSO calculating TCP checksum for packet with %d bytes data\n", tcp_hlen + chunk_size));
if (tcp_send_offset)
{ {
DEBUG_PRINT(("RTL8139: +++ C+ mode calculating TCP checksum for packet with %d bytes data\n", ip_data_len)); memcpy((uint8_t*)p_tcp_hdr + tcp_hlen, (uint8_t*)p_tcp_hdr + tcp_hlen + tcp_send_offset, chunk_size);
}
struct tcpiphdr * p_tcpip_hdr = (struct tcpiphdr *)local_checksum_m.m_data; /* keep PUSH and FIN flags only for the last frame */
p_tcpip_hdr->ti_x1 = 0; if (!is_last_frame)
p_tcpip_hdr->ti_pr = IPPROTO_TCP; {
p_tcpip_hdr->ti_len = htons(ip_data_len); TCP_HEADER_CLEAR_FLAGS(p_tcp_hdr, TCP_FLAG_PUSH|TCP_FLAG_FIN);
}
struct tcphdr* p_tcp_hdr = (struct tcphdr*) (local_checksum_m.m_data+12); /* recalculate TCP checksum */
ip_pseudo_header *p_tcpip_hdr = (ip_pseudo_header *)data_to_checksum;
p_tcpip_hdr->zeros = 0;
p_tcpip_hdr->ip_proto = IP_PROTO_TCP;
p_tcpip_hdr->ip_payload = cpu_to_be16(tcp_hlen + chunk_size);
p_tcp_hdr->th_sum = 0; p_tcp_hdr->th_sum = 0;
int tcp_checksum = cksum(&local_checksum_m, ip_data_len + 12); int tcp_checksum = ip_checksum(data_to_checksum, tcp_hlen + chunk_size + 12);
DEBUG_PRINT(("RTL8139: +++ C+ mode TSO TCP checksum %04x\n", tcp_checksum));
p_tcp_hdr->th_sum = tcp_checksum;
/* restore IP header */
memcpy(eth_payload_data, saved_ip_header, hlen);
/* set IP data length and recalculate IP checksum */
ip->ip_len = cpu_to_be16(hlen + tcp_hlen + chunk_size);
/* increment IP id for subsequent frames */
ip->ip_id = cpu_to_be16(tcp_send_offset/tcp_chunk_size + be16_to_cpu(ip->ip_id));
ip->ip_sum = 0;
ip->ip_sum = ip_checksum(eth_payload_data, hlen);
DEBUG_PRINT(("RTL8139: +++ C+ mode TSO IP header len=%d checksum=%04x\n", hlen, ip->ip_sum));
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);
/* 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));
++send_count;
}
/* Stop sending this frame */
saved_size = 0;
}
else if (txdw0 & (CP_TX_TCPCS|CP_TX_UDPCS))
{
DEBUG_PRINT(("RTL8139: +++ C+ mode need TCP or UDP checksum\n"));
/* maximum IP header length is 60 bytes */
uint8_t saved_ip_header[60];
memcpy(saved_ip_header, eth_payload_data, hlen);
uint8_t *data_to_checksum = eth_payload_data + hlen - 12;
// size_t data_to_checksum_len = eth_payload_len - hlen + 12;
/* add 4 TCP pseudoheader fields */
/* copy IP source and destination fields */
memcpy(data_to_checksum, saved_ip_header + 12, 8);
if ((txdw0 & CP_TX_TCPCS) && ip_protocol == IP_PROTO_TCP)
{
DEBUG_PRINT(("RTL8139: +++ C+ mode calculating TCP checksum for packet with %d bytes data\n", ip_data_len));
ip_pseudo_header *p_tcpip_hdr = (ip_pseudo_header *)data_to_checksum;
p_tcpip_hdr->zeros = 0;
p_tcpip_hdr->ip_proto = IP_PROTO_TCP;
p_tcpip_hdr->ip_payload = cpu_to_be16(ip_data_len);
tcp_header* p_tcp_hdr = (tcp_header *) (data_to_checksum+12);
p_tcp_hdr->th_sum = 0;
int tcp_checksum = ip_checksum(data_to_checksum, ip_data_len + 12);
DEBUG_PRINT(("RTL8139: +++ C+ mode TCP checksum %04x\n", tcp_checksum)); DEBUG_PRINT(("RTL8139: +++ C+ mode TCP checksum %04x\n", tcp_checksum));
p_tcp_hdr->th_sum = tcp_checksum; p_tcp_hdr->th_sum = tcp_checksum;
} }
else if ((txdw0 & CP_TX_UDPCS) && ip_protocol == IPPROTO_UDP) else if ((txdw0 & CP_TX_UDPCS) && ip_protocol == IP_PROTO_UDP)
{ {
DEBUG_PRINT(("RTL8139: +++ C+ mode calculating UDP checksum for packet with %d bytes data\n", ip_data_len)); DEBUG_PRINT(("RTL8139: +++ C+ mode calculating UDP checksum for packet with %d bytes data\n", ip_data_len));
struct udpiphdr * p_udpip_hdr = (struct udpiphdr *)local_checksum_m.m_data; ip_pseudo_header *p_udpip_hdr = (ip_pseudo_header *)data_to_checksum;
p_udpip_hdr->ui_x1 = 0; p_udpip_hdr->zeros = 0;
p_udpip_hdr->ui_pr = IPPROTO_UDP; p_udpip_hdr->ip_proto = IP_PROTO_UDP;
p_udpip_hdr->ui_len = htons(ip_data_len); p_udpip_hdr->ip_payload = cpu_to_be16(ip_data_len);
struct udphdr* p_udp_hdr = (struct udphdr*) (local_checksum_m.m_data+12); udp_header *p_udp_hdr = (udp_header *) (data_to_checksum+12);
int old_csum = p_udp_hdr->uh_sum;
p_udp_hdr->uh_sum = 0; p_udp_hdr->uh_sum = 0;
int udp_checksum = cksum(&local_checksum_m, ip_data_len + 12); int udp_checksum = ip_checksum(data_to_checksum, ip_data_len + 12);
DEBUG_PRINT(("RTL8139: +++ C+ mode UDP checksum %04x\n", udp_checksum)); DEBUG_PRINT(("RTL8139: +++ C+ mode UDP checksum %04x\n", udp_checksum));
if (old_csum != udp_checksum)
{
DEBUG_PRINT(("RTL8139: +++ C+ mode UDP checksum mismatch old=%04x new=%04x\n",
old_csum, udp_checksum));
}
p_udp_hdr->uh_sum = udp_checksum; p_udp_hdr->uh_sum = udp_checksum;
} }
/* restore IP header */ /* restore IP header */
memcpy(local_m.m_data, saved_ip_header, hlen); memcpy(eth_payload_data, saved_ip_header, hlen);
} }
} }
} }
@ -2085,16 +2297,7 @@ static int rtl8139_cplus_transmit_one(RTL8139State *s)
DEBUG_PRINT(("RTL8139: +++ C+ mode transmitting %d bytes packet\n", saved_size)); DEBUG_PRINT(("RTL8139: +++ C+ mode transmitting %d bytes packet\n", saved_size));
if (TxLoopBack == (s->TxConfig & TxLoopBack)) rtl8139_transfer_frame(s, saved_buffer, saved_size, 1);
{
DEBUG_PRINT(("RTL8139: +++ C+ transmit loopback mode\n"));
rtl8139_receive(s, saved_buffer, saved_size);
}
else
{
/* transmit the packet */
qemu_send_packet(s->vc, saved_buffer, saved_size);
}
/* restore card space if there was no recursion and reset offset */ /* restore card space if there was no recursion and reset offset */
if (!s->cplus_txbuffer) if (!s->cplus_txbuffer)
@ -2253,8 +2456,6 @@ static void rtl8139_TxAddr_write(RTL8139State *s, uint32_t txAddrOffset, uint32_
DEBUG_PRINT(("RTL8139: TxAddr write offset=0x%x val=0x%08x\n", txAddrOffset, val)); DEBUG_PRINT(("RTL8139: TxAddr write offset=0x%x val=0x%08x\n", txAddrOffset, val));
s->TxAddr[txAddrOffset/4] = le32_to_cpu(val); s->TxAddr[txAddrOffset/4] = le32_to_cpu(val);
s->currCPlusTxDesc = 0;
} }
static uint32_t rtl8139_TxAddr_read(RTL8139State *s, uint32_t txAddrOffset) static uint32_t rtl8139_TxAddr_read(RTL8139State *s, uint32_t txAddrOffset)