/*
* Name: qla_tx_tso
* Function: Checks if the packet to be transmitted is a candidate for
* Large TCP Segment Offload. If yes, the appropriate fields in the Tx
* Ring Structure are plugged in.
*/
static int
qla_tx_tso(qla_host_t *ha, struct mbuf *mp, q80_tx_cmd_t *tx_cmd)
{
struct ether_vlan_header *eh;
struct ip *ip = NULL;
struct tcphdr *th = NULL;
uint32_t ehdrlen, hdrlen, ip_hlen, tcp_hlen;
uint16_t etype, opcode, offload = 1;
device_t dev;
dev = ha->pci_dev;
if (mp->m_pkthdr.len <= ha->max_frame_size)
return (-1);
eh = mtod(mp, struct ether_vlan_header *);
if (eh->evl_encap_proto == htons(ETHERTYPE_VLAN)) {
ehdrlen = ETHER_HDR_LEN + ETHER_VLAN_ENCAP_LEN;
etype = ntohs(eh->evl_proto);
} else {
ehdrlen = ETHER_HDR_LEN;
etype = ntohs(eh->evl_encap_proto);
}
switch (etype) {
case ETHERTYPE_IP:
ip = (struct ip *)(mp->m_data + ehdrlen);
ip_hlen = ip->ip_hl << 2;
opcode = Q8_TX_CMD_OP_XMT_TCP_LSO;
if (ip->ip_p != IPPROTO_TCP) {
offload = 0;
} else
th = (struct tcphdr *)((caddr_t)ip + ip_hlen);
break;
default:
QL_DPRINT8((dev, "%s: type!=ip\n", __func__));
offload = 0;
break;
}
if (!offload)
return (-1);
tcp_hlen = th->th_off << 2;
hdrlen = ehdrlen + ip_hlen + tcp_hlen;
if (mp->m_len < hdrlen) {
device_printf(dev, "%s: (mp->m_len < hdrlen)\n", __func__);
return (-1);
}
tx_cmd->flags_opcode = opcode ;
tx_cmd->tcp_hdr_off = ip_hlen + ehdrlen;
tx_cmd->ip_hdr_off = ehdrlen;
tx_cmd->mss = mp->m_pkthdr.tso_segsz;
tx_cmd->total_hdr_len = hdrlen;
/* Check for Multicast least significant bit of MSB == 1 */
if (eh->evl_dhost[0] & 0x01) {
tx_cmd->flags_opcode = Q8_TX_CMD_FLAGS_MULTICAST;
}
return (0);
}
/*
* Name: qla_hw_send
* Function: Transmits a packet. It first checks if the packet is a
* candidate for Large TCP Segment Offload and then for UDP/TCP checksum
* offload. If either of these creteria are not met, it is transmitted
* as a regular ethernet frame.
*/
int
qla_hw_send(qla_host_t *ha, bus_dma_segment_t *segs, int nsegs,
uint32_t *tx_idx, struct mbuf *mp)
{
struct ether_vlan_header *eh;
qla_hw_t *hw = &ha->hw;
q80_tx_cmd_t *tx_cmd, tso_cmd;
bus_dma_segment_t *c_seg;
uint32_t num_tx_cmds, hdr_len = 0;
uint32_t total_length = 0, bytes, tx_cmd_count = 0;
device_t dev;
int i;
dev = ha->pci_dev;
/*
* Always make sure there is atleast one empty slot in the tx_ring
* tx_ring is considered full when there only one entry available
*/
num_tx_cmds = (nsegs + (Q8_TX_CMD_MAX_SEGMENTS - 1)) >> 2;
total_length = mp->m_pkthdr.len;
if (total_length > QLA_MAX_TSO_FRAME_SIZE) {
device_printf(dev, "%s: total length exceeds maxlen(%d)\n",
__func__, total_length);
return (-1);
}
bzero((void *)&tso_cmd, sizeof(q80_tx_cmd_t));
if (qla_tx_tso(ha, mp, &tso_cmd) == 0) {
/* find the additional tx_cmd descriptors required */
hdr_len = tso_cmd.total_hdr_len;
bytes = sizeof(q80_tx_cmd_t) - Q8_TX_CMD_TSO_ALIGN;
bytes = QL_MIN(bytes, hdr_len);
num_tx_cmds++;
hdr_len -= bytes;
while (hdr_len) {
bytes = QL_MIN((sizeof(q80_tx_cmd_t)), hdr_len);
hdr_len -= bytes;
num_tx_cmds++;
}
hdr_len = tso_cmd.total_hdr_len;
}
if (hw->txr_free <= (num_tx_cmds + QLA_TX_MIN_FREE)) {
qla_hw_tx_done_locked(ha);
if (hw->txr_free <= (num_tx_cmds + QLA_TX_MIN_FREE)) {
QL_DPRINT8((dev, "%s: (hw->txr_free <= "
"(num_tx_cmds + QLA_TX_MIN_FREE))\n",
__func__));
return (-1);
}
}
*tx_idx = hw->txr_next;
tx_cmd = &hw->tx_ring_base[hw->txr_next];
if (hdr_len == 0) {
if ((nsegs > Q8_TX_MAX_SEGMENTS) ||
(mp->m_pkthdr.len > ha->max_frame_size)){
device_printf(dev,
"%s: (nsegs[%d, %d, 0x%x] > Q8_TX_MAX_SEGMENTS)\n",
__func__, nsegs, mp->m_pkthdr.len,
mp->m_pkthdr.csum_flags);
qla_dump_buf8(ha, "qla_hw_send: wrong pkt",
mtod(mp, char *), mp->m_len);
return (EINVAL);
}
bzero((void *)tx_cmd, sizeof(q80_tx_cmd_t));
if (qla_tx_chksum(ha, mp, tx_cmd) != 0)
tx_cmd->flags_opcode = Q8_TX_CMD_OP_XMT_ETHER;
} else {
/*
* Name: qla_tx_tso
* Function: Checks if the packet to be transmitted is a candidate for
* Large TCP Segment Offload. If yes, the appropriate fields in the Tx
* Ring Structure are plugged in.
*/
static int
qla_tx_tso(qla_host_t *ha, struct mbuf *mp, q80_tx_cmd_t *tx_cmd, uint8_t *hdr)
{
struct ether_vlan_header *eh;
struct ip *ip = NULL;
struct tcphdr *th = NULL;
uint32_t ehdrlen, hdrlen = 0, ip_hlen, tcp_hlen, tcp_opt_off;
uint16_t etype, opcode, offload = 1;
uint8_t *tcp_opt;
device_t dev;
dev = ha->pci_dev;
eh = mtod(mp, struct ether_vlan_header *);
if (eh->evl_encap_proto == htons(ETHERTYPE_VLAN)) {
ehdrlen = ETHER_HDR_LEN + ETHER_VLAN_ENCAP_LEN;
etype = ntohs(eh->evl_proto);
} else {
ehdrlen = ETHER_HDR_LEN;
etype = ntohs(eh->evl_encap_proto);
}
switch (etype) {
case ETHERTYPE_IP:
tcp_opt_off = ehdrlen + sizeof(struct ip) +
sizeof(struct tcphdr);
if (mp->m_len < tcp_opt_off) {
m_copydata(mp, 0, tcp_opt_off, hdr);
ip = (struct ip *)hdr;
} else {
ip = (struct ip *)(mp->m_data + ehdrlen);
}
ip_hlen = ip->ip_hl << 2;
opcode = Q8_TX_CMD_OP_XMT_TCP_LSO;
if ((ip->ip_p != IPPROTO_TCP) ||
(ip_hlen != sizeof (struct ip))) {
offload = 0;
} else {
th = (struct tcphdr *)((caddr_t)ip + ip_hlen);
}
break;
default:
QL_DPRINT8((dev, "%s: type!=ip\n", __func__));
offload = 0;
break;
}
if (!offload)
return (-1);
tcp_hlen = th->th_off << 2;
hdrlen = ehdrlen + ip_hlen + tcp_hlen;
if (mp->m_len < hdrlen) {
if (mp->m_len < tcp_opt_off) {
if (tcp_hlen > sizeof(struct tcphdr)) {
m_copydata(mp, tcp_opt_off,
(tcp_hlen - sizeof(struct tcphdr)),
&hdr[tcp_opt_off]);
}
} else {
m_copydata(mp, 0, hdrlen, hdr);
}
}
if ((mp->m_pkthdr.csum_flags & CSUM_TSO) == 0) {
/* If TCP options are preset only time stamp option is supported */
if ((tcp_hlen - sizeof(struct tcphdr)) != 10)
return -1;
else {
if (mp->m_len < hdrlen) {
tcp_opt = &hdr[tcp_opt_off];
} else {
tcp_opt = (uint8_t *)(mp->m_data + tcp_opt_off);
}
if ((*tcp_opt != 0x01) || (*(tcp_opt + 1) != 0x01) ||
(*(tcp_opt + 2) != 0x08) || (*(tcp_opt + 2) != 10)) {
return -1;
}
}
tx_cmd->mss = ha->max_frame_size - ETHER_CRC_LEN - hdrlen;
} else {
tx_cmd->mss = mp->m_pkthdr.tso_segsz;
}
tx_cmd->flags_opcode = opcode ;
tx_cmd->tcp_hdr_off = ip_hlen + ehdrlen;
tx_cmd->ip_hdr_off = ehdrlen;
tx_cmd->mss = mp->m_pkthdr.tso_segsz;
tx_cmd->total_hdr_len = hdrlen;
/* Check for Multicast least significant bit of MSB == 1 */
if (eh->evl_dhost[0] & 0x01) {
tx_cmd->flags_opcode = Q8_TX_CMD_FLAGS_MULTICAST;
}
if (mp->m_len < hdrlen) {
return (1);
}
return (0);
}