/*
* Keep progressing sends on this queue until:
* a) no more send credits on the queue (it's full)
* or
* b) all endpoints are complete or blocked awaiting ACKs
*/
void
usdf_msg_tx_progress(struct usdf_tx *tx)
{
struct usdf_ep *ep;
struct usd_qp_impl *qp;
qp = to_qpi(tx->tx_qp);
while (qp->uq_wq.uwq_send_credits > 1 &&
!TAILQ_EMPTY(&tx->t.msg.tx_ep_have_acks)) {
ep = TAILQ_FIRST(&tx->t.msg.tx_ep_have_acks);
TAILQ_REMOVE_MARK(&tx->t.msg.tx_ep_have_acks,
ep, e.msg.ep_ack_link);
usdf_msg_send_ack(tx, ep);
}
while (qp->uq_wq.uwq_send_credits > 1 &&
!TAILQ_EMPTY(&tx->t.msg.tx_ep_ready)) {
ep = TAILQ_FIRST(&tx->t.msg.tx_ep_ready);
/*
* Send next segment on this EP. This will also remove the
* current send from the EP send list if it completes
*/
usdf_msg_send_segment(tx, ep);
--ep->e.msg.ep_seq_credits;
if (TAILQ_EMPTY(&ep->e.msg.ep_posted_wqe)) {
TAILQ_REMOVE_MARK(&tx->t.msg.tx_ep_ready,
ep, e.msg.ep_link);
} else {
--ep->e.msg.ep_fairness_credits;
if (ep->e.msg.ep_seq_credits == 0) {
TAILQ_REMOVE_MARK(&tx->t.msg.tx_ep_ready,
ep, e.msg.ep_link);
ep->e.msg.ep_fairness_credits =
USDF_MSG_FAIRNESS_CREDITS;
/* fairness credits exhausted, go to back of the line */
} else if (ep->e.msg.ep_fairness_credits == 0) {
TAILQ_REMOVE(&tx->t.msg.tx_ep_ready,
ep, e.msg.ep_link);
TAILQ_INSERT_TAIL(&tx->t.msg.tx_ep_ready,
ep, e.msg.ep_link);
ep->e.msg.ep_fairness_credits =
USDF_MSG_FAIRNESS_CREDITS;
}
}
}
}
static int
usdf_pep_listen_cb(void *v)
{
struct usdf_pep *pep;
struct sockaddr_in sin;
struct usdf_connreq *crp;
struct epoll_event ev;
socklen_t socklen;
int ret;
int s;
pep = v;
socklen = sizeof(sin);
s = accept(pep->pep_sock, &sin, &socklen);
if (s == -1) {
/* ignore early failure */
return 0;
}
crp = NULL;
pthread_spin_lock(&pep->pep_cr_lock);
if (!TAILQ_EMPTY(&pep->pep_cr_free)) {
crp = TAILQ_FIRST(&pep->pep_cr_free);
TAILQ_REMOVE_MARK(&pep->pep_cr_free, crp, cr_link);
TAILQ_NEXT(crp, cr_link) = NULL;
}
pthread_spin_unlock(&pep->pep_cr_lock);
/* no room for request, just drop it */
if (crp == NULL) {
/* XXX send response? */
close(s);
return 0;
}
crp->cr_sockfd = s;
crp->cr_pep = pep;
crp->cr_ptr = crp->cr_data;
crp->cr_resid = sizeof(struct usdf_connreq_msg);
crp->cr_pollitem.pi_rtn = usdf_pep_read_connreq;
crp->cr_pollitem.pi_context = crp;
ev.events = EPOLLIN;
ev.data.ptr = &crp->cr_pollitem;
ret = epoll_ctl(pep->pep_fabric->fab_epollfd, EPOLL_CTL_ADD,
crp->cr_sockfd, &ev);
if (ret == -1) {
crp->cr_pollitem.pi_rtn = NULL;
usdf_cm_msg_connreq_failed(crp, -errno);
return 0;
}
TAILQ_INSERT_TAIL(&pep->pep_cr_pending, crp, cr_link);
return 0;
}
