static int send_dreg(struct vio_driver_state *vio)
{
struct vio_dring_state *dr = &vio->drings[VIO_DRIVER_TX_RING];
union {
struct vio_dring_register pkt;
char all[sizeof(struct vio_dring_register) +
(sizeof(struct ldc_trans_cookie) *
dr->ncookies)];
} u;
int i;
memset(&u, 0, sizeof(u));
init_tag(&u.pkt.tag, VIO_TYPE_CTRL, VIO_SUBTYPE_INFO, VIO_DRING_REG);
u.pkt.dring_ident = 0;
u.pkt.num_descr = dr->num_entries;
u.pkt.descr_size = dr->entry_size;
u.pkt.options = VIO_TX_DRING;
u.pkt.num_cookies = dr->ncookies;
viodbg(HS, "SEND DRING_REG INFO ndesc[%u] dsz[%u] opt[0x%x] "
"ncookies[%u]\n",
u.pkt.num_descr, u.pkt.descr_size, u.pkt.options,
u.pkt.num_cookies);
for (i = 0; i < dr->ncookies; i++) {
u.pkt.cookies[i] = dr->cookies[i];
viodbg(HS, "DRING COOKIE(%d) [%016llx:%016llx]\n",
i,
(unsigned long long) u.pkt.cookies[i].cookie_addr,
(unsigned long long) u.pkt.cookies[i].cookie_size);
}
return send_ctrl(vio, &u.pkt.tag, sizeof(u));
}
static int process_rdx_info(struct vio_driver_state *vio, struct vio_rdx *pkt)
{
viodbg(HS, "GOT RDX INFO\n");
pkt->tag.stype = VIO_SUBTYPE_ACK;
viodbg(HS, "SEND RDX ACK\n");
if (send_ctrl(vio, &pkt->tag, sizeof(*pkt)) < 0)
return handshake_failure(vio);
vio->hs_state |= VIO_HS_SENT_RDX_ACK;
return 0;
}
static int process_dreg_ack(struct vio_driver_state *vio,
struct vio_dring_register *pkt)
{
struct vio_dring_state *dr;
viodbg(HS, "GOT DRING_REG ACK ident[%llx] "
"ndesc[%u] dsz[%u] opt[0x%x] ncookies[%u]\n",
(unsigned long long) pkt->dring_ident,
pkt->num_descr, pkt->descr_size, pkt->options,
pkt->num_cookies);
dr = &vio->drings[VIO_DRIVER_TX_RING];
if (!(vio->dr_state & VIO_DR_STATE_TXREQ))
return handshake_failure(vio);
dr->ident = pkt->dring_ident;
vio->dr_state |= VIO_DR_STATE_TXREG;
if (all_drings_registered(vio)) {
if (send_rdx(vio) < 0)
return handshake_failure(vio);
vio->hs_state = VIO_HS_SENT_RDX;
}
return 0;
}
static int handshake_failure(struct vio_driver_state *vio)
{
struct vio_dring_state *dr;
/* XXX Put policy here... Perhaps start a timer to fire
* XXX in 100 ms, which will bring the link up and retry
* XXX the handshake.
*/
viodbg(HS, "HANDSHAKE FAILURE\n");
vio->dr_state &= ~(VIO_DR_STATE_TXREG |
VIO_DR_STATE_RXREG);
dr = &vio->drings[VIO_DRIVER_RX_RING];
memset(dr, 0, sizeof(*dr));
kfree(vio->desc_buf);
vio->desc_buf = NULL;
vio->desc_buf_len = 0;
vio->hs_state = VIO_HS_INVALID;
return -ECONNRESET;
}
/* The issue is that the Solaris virtual disk server just mirrors the
* SID values it gets from the client peer. So we work around that
* here in vio_{validate,send}_sid() so that the drivers don't need
* to be aware of this crap.
*/
int vio_validate_sid(struct vio_driver_state *vio, struct vio_msg_tag *tp)
{
u32 sid;
/* Always let VERSION+INFO packets through unchecked, they
* define the new SID.
*/
if (tp->type == VIO_TYPE_CTRL &&
tp->stype == VIO_SUBTYPE_INFO &&
tp->stype_env == VIO_VER_INFO)
return 0;
/* Ok, now figure out which SID to use. */
switch (vio->dev_class) {
case VDEV_NETWORK:
case VDEV_NETWORK_SWITCH:
case VDEV_DISK_SERVER:
default:
sid = vio->_peer_sid;
break;
case VDEV_DISK:
sid = vio->_local_sid;
break;
}
if (sid == tp->sid)
return 0;
viodbg(DATA, "BAD SID tag->sid[%08x] peer_sid[%08x] local_sid[%08x]\n",
tp->sid, vio->_peer_sid, vio->_local_sid);
return -EINVAL;
}
static int process_rdx_ack(struct vio_driver_state *vio, struct vio_rdx *pkt)
{
viodbg(HS, "GOT RDX ACK\n");
if (!(vio->hs_state & VIO_HS_SENT_RDX))
return handshake_failure(vio);
vio->hs_state |= VIO_HS_GOT_RDX_ACK;
return 0;
}
static int process_dreg_nack(struct vio_driver_state *vio,
struct vio_dring_register *pkt)
{
viodbg(HS, "GOT DRING_REG NACK ident[%llx] "
"ndesc[%u] dsz[%u] opt[0x%x] ncookies[%u]\n",
(unsigned long long) pkt->dring_ident,
pkt->num_descr, pkt->descr_size, pkt->options,
pkt->num_cookies);
return handshake_failure(vio);
}
static int send_rdx(struct vio_driver_state *vio)
{
struct vio_rdx pkt;
memset(&pkt, 0, sizeof(pkt));
init_tag(&pkt.tag, VIO_TYPE_CTRL, VIO_SUBTYPE_INFO, VIO_RDX);
viodbg(HS, "SEND RDX INFO\n");
return send_ctrl(vio, &pkt.tag, sizeof(pkt));
}
static int process_unknown(struct vio_driver_state *vio, void *arg)
{
struct vio_msg_tag *pkt = arg;
viodbg(HS, "UNKNOWN CONTROL [%02x:%02x:%04x:%08x]\n",
pkt->type, pkt->stype, pkt->stype_env, pkt->sid);
printk(KERN_ERR "vio: ID[%lu] Resetting connection.\n",
vio->vdev->channel_id);
ldc_disconnect(vio->lp);
return -ECONNRESET;
}
static int start_handshake(struct vio_driver_state *vio)
{
int err;
viodbg(HS, "START HANDSHAKE\n");
vio->hs_state = VIO_HS_INVALID;
err = send_version(vio,
vio->ver_table[0].major,
vio->ver_table[0].minor);
if (err < 0)
return err;
return 0;
}
static int send_version(struct vio_driver_state *vio, u16 major, u16 minor)
{
struct vio_ver_info pkt;
vio->_local_sid = (u32) sched_clock();
memset(&pkt, 0, sizeof(pkt));
init_tag(&pkt.tag, VIO_TYPE_CTRL, VIO_SUBTYPE_INFO, VIO_VER_INFO);
pkt.major = major;
pkt.minor = minor;
pkt.dev_class = vio->dev_class;
viodbg(HS, "SEND VERSION INFO maj[%u] min[%u] devclass[%u]\n",
major, minor, vio->dev_class);
return send_ctrl(vio, &pkt.tag, sizeof(pkt));
}
static int process_ver_nack(struct vio_driver_state *vio,
struct vio_ver_info *pkt)
{
struct vio_version *nver;
viodbg(HS, "GOT VERSION NACK maj[%u] min[%u] devclass[%u]\n",
pkt->major, pkt->minor, pkt->dev_class);
if (pkt->major == 0 && pkt->minor == 0)
return handshake_failure(vio);
nver = find_by_major(vio, pkt->major);
if (!nver)
return handshake_failure(vio);
if (send_version(vio, nver->major, nver->minor) < 0)
return handshake_failure(vio);
return 0;
}
static int process_dunreg(struct vio_driver_state *vio,
struct vio_dring_unregister *pkt)
{
struct vio_dring_state *dr = &vio->drings[VIO_DRIVER_RX_RING];
viodbg(HS, "GOT DRING_UNREG\n");
if (pkt->dring_ident != dr->ident)
return 0;
vio->dr_state &= ~VIO_DR_STATE_RXREG;
memset(dr, 0, sizeof(*dr));
kfree(vio->desc_buf);
vio->desc_buf = NULL;
vio->desc_buf_len = 0;
return 0;
}
static int handshake_failure(struct vio_driver_state *vio)
{
struct vio_dring_state *dr;
viodbg(HS, "HANDSHAKE FAILURE\n");
vio->dr_state &= ~(VIO_DR_STATE_TXREG |
VIO_DR_STATE_RXREG);
dr = &vio->drings[VIO_DRIVER_RX_RING];
memset(dr, 0, sizeof(*dr));
kfree(vio->desc_buf);
vio->desc_buf = NULL;
vio->desc_buf_len = 0;
vio->hs_state = VIO_HS_INVALID;
return -ECONNRESET;
}
static int process_ver_info(struct vio_driver_state *vio,
struct vio_ver_info *pkt)
{
struct vio_version *vap;
int err;
viodbg(HS, "GOT VERSION INFO maj[%u] min[%u] devclass[%u]\n",
pkt->major, pkt->minor, pkt->dev_class);
if (vio->hs_state != VIO_HS_INVALID) {
/* XXX Perhaps invoke start_handshake? XXX */
memset(&vio->ver, 0, sizeof(vio->ver));
vio->hs_state = VIO_HS_INVALID;
}
vap = find_by_major(vio, pkt->major);
vio->_peer_sid = pkt->tag.sid;
if (!vap) {
pkt->tag.stype = VIO_SUBTYPE_NACK;
pkt->major = 0;
pkt->minor = 0;
viodbg(HS, "SEND VERSION NACK maj[0] min[0]\n");
err = send_ctrl(vio, &pkt->tag, sizeof(*pkt));
} else if (vap->major != pkt->major) {
pkt->tag.stype = VIO_SUBTYPE_NACK;
pkt->major = vap->major;
pkt->minor = vap->minor;
viodbg(HS, "SEND VERSION NACK maj[%u] min[%u]\n",
pkt->major, pkt->minor);
err = send_ctrl(vio, &pkt->tag, sizeof(*pkt));
} else {
struct vio_version ver = {
.major = pkt->major,
.minor = pkt->minor,
};
if (ver.minor > vap->minor)
ver.minor = vap->minor;
pkt->minor = ver.minor;
pkt->tag.stype = VIO_SUBTYPE_ACK;
viodbg(HS, "SEND VERSION ACK maj[%u] min[%u]\n",
pkt->major, pkt->minor);
err = send_ctrl(vio, &pkt->tag, sizeof(*pkt));
if (err > 0) {
vio->ver = ver;
vio->hs_state = VIO_HS_GOTVERS;
}
}
if (err < 0)
return handshake_failure(vio);
return 0;
}
static int process_ver_ack(struct vio_driver_state *vio,
struct vio_ver_info *pkt)
{
viodbg(HS, "GOT VERSION ACK maj[%u] min[%u] devclass[%u]\n",
pkt->major, pkt->minor, pkt->dev_class);
if (vio->hs_state & VIO_HS_GOTVERS) {
if (vio->ver.major != pkt->major ||
vio->ver.minor != pkt->minor) {
pkt->tag.stype = VIO_SUBTYPE_NACK;
(void) send_ctrl(vio, &pkt->tag, sizeof(*pkt));
return handshake_failure(vio);
}
} else {
vio->ver.major = pkt->major;
vio->ver.minor = pkt->minor;
vio->hs_state = VIO_HS_GOTVERS;
}
switch (vio->dev_class) {
case VDEV_NETWORK:
case VDEV_DISK:
if (send_attr(vio) < 0)
return handshake_failure(vio);
break;
default:
break;
}
return 0;
}
static int process_rdx_nack(struct vio_driver_state *vio, struct vio_rdx *pkt)
{
viodbg(HS, "GOT RDX NACK\n");
return handshake_failure(vio);
}
static int process_dreg_info(struct vio_driver_state *vio,
struct vio_dring_register *pkt)
{
struct vio_dring_state *dr;
int i, len;
viodbg(HS, "GOT DRING_REG INFO ident[%llx] "
"ndesc[%u] dsz[%u] opt[0x%x] ncookies[%u]\n",
(unsigned long long) pkt->dring_ident,
pkt->num_descr, pkt->descr_size, pkt->options,
pkt->num_cookies);
if (!(vio->dr_state & VIO_DR_STATE_RXREQ))
goto send_nack;
if (vio->dr_state & VIO_DR_STATE_RXREG)
goto send_nack;
BUG_ON(vio->desc_buf);
vio->desc_buf = kzalloc(pkt->descr_size, GFP_ATOMIC);
if (!vio->desc_buf)
goto send_nack;
vio->desc_buf_len = pkt->descr_size;
dr = &vio->drings[VIO_DRIVER_RX_RING];
dr->num_entries = pkt->num_descr;
dr->entry_size = pkt->descr_size;
dr->ncookies = pkt->num_cookies;
for (i = 0; i < dr->ncookies; i++) {
dr->cookies[i] = pkt->cookies[i];
viodbg(HS, "DRING COOKIE(%d) [%016llx:%016llx]\n",
i,
(unsigned long long)
pkt->cookies[i].cookie_addr,
(unsigned long long)
pkt->cookies[i].cookie_size);
}
pkt->tag.stype = VIO_SUBTYPE_ACK;
pkt->dring_ident = ++dr->ident;
viodbg(HS, "SEND DRING_REG ACK ident[%llx]\n",
(unsigned long long) pkt->dring_ident);
len = (sizeof(*pkt) +
(dr->ncookies * sizeof(struct ldc_trans_cookie)));
if (send_ctrl(vio, &pkt->tag, len) < 0)
goto send_nack;
vio->dr_state |= VIO_DR_STATE_RXREG;
return 0;
send_nack:
pkt->tag.stype = VIO_SUBTYPE_NACK;
viodbg(HS, "SEND DRING_REG NACK\n");
(void) send_ctrl(vio, &pkt->tag, sizeof(*pkt));
return handshake_failure(vio);
}
