static
void pscom_mxm_read_start(pscom_con_t *con)
{
if (!con->arch.mxm.reading) {
con->arch.mxm.reading = 1;
poll_user_inc();
}
}
static
void pscom_psm_read_start(pscom_con_t *con)
{
if (!con->arch.psm.reading) {
con->arch.psm.reading = 1;
poll_user_inc();
}
/* post a receive */
pscom_psm_do_read(con);
}
static
void pscom_mxm_do_write(pscom_con_t *con)
{
struct iovec iov[2];
psmxm_con_info_t *ci = con->arch.mxm.ci;
pscom_req_t *req = con->arch.mxm.sreq;
int polling = 0;
if (req) {
// proceed with the send from the last iteration.
polling = 1;
unsigned sent = psmxm_send_progress(ci);
if (sent) {
pscom_write_done(con, req, sent);
} else {
/* FIXME: we might want to send more than one message at a
time. */
/* send in progress. wait for completion before
transmitting the next message. */
return;
}
}
/* get and post a new write request */
req = pscom_write_get_iov(con, iov);
if (req) {
int ret = psmxm_sendv(ci, iov, iov[0].iov_len + iov[1].iov_len);
if (ret > 0){
/* sending ret bytes. Complete this request in the next iteration. */
if (!polling) poll_user_inc();
} else if (ret == -EAGAIN){
/* Try again later. */
req = NULL;
} else {
assert(ret == -EPIPE);
errno = -ret;
pscom_con_error(con, PSCOM_OP_WRITE, PSCOM_ERR_STDERROR);
req = NULL;
}
}
if (!req && polling) poll_user_dec();
// Remember the current request or NULL in the case of EAGAIN.
con->arch.mxm.sreq = req;
}
/* sends an iov. FIXME: returns 0 if the send is complete, -EAGAIN if
it created one or more requests for it, and -EPIPE in case of an
error. */
static
int _pspsm_sendv(pspsm_con_info_t *con_info, uint64_t magic)
{
uint64_t tag = con_info->send_id | magic;
unsigned int i=0;
psm_error_t ret;
size_t len = con_info->iov[0].iov_len + con_info->iov[1].iov_len;
if (len <= pscom.env.readahead){
pscom_memcpy_from_iov(sendbuf, con_info->iov, len);
/* we hope that doesn't block - it shouldn't, as the
* message is sufficiently small */
ret = psm_mq_send(pspsm_mq, con_info->epaddr,
/* flags*/ 0, tag, sendbuf, len);
if (ret != PSM_OK) goto err;
return 0;
}
for (i=0; i<2; i++){
if (con_info->iov[i].iov_len){
/* pspsm_dprint(0, "Send part[%d], %p len %d to con %s\n", i,
con_info->iov[i].iov_base, (int)con_info->iov[i].iov_len,
con_info->con->pub.remote_con_info.name); */
if (_pspsm_send_buf(con_info, con_info->iov[i].iov_base,
con_info->iov[i].iov_len,
tag, &con_info->sreqs[i], i)){
return -EPIPE;
}
/* inc for each outstanding send request */
poll_user_inc();
}
}
return -EAGAIN;
err:
pspsm_err(psm_error_get_string(ret));
pspsm_dprint(1, "_pspsm_send_buf: %s", pspsm_err_str);
return -EPIPE;
}
