void iser_snd_completion(struct iser_desc *tx_desc)
{
struct iser_dto *dto = &tx_desc->dto;
struct iser_conn *ib_conn = dto->ib_conn;
struct iscsi_iser_conn *iser_conn = ib_conn->iser_conn;
struct iscsi_conn *conn = iser_conn->iscsi_conn;
struct iscsi_task *task;
int resume_tx = 0;
iser_dbg("Initiator, Data sent dto=0x%p\n", dto);
iser_dto_buffs_release(dto);
if (tx_desc->type == ISCSI_TX_DATAOUT)
kmem_cache_free(ig.desc_cache, tx_desc);
if (atomic_read(&iser_conn->ib_conn->post_send_buf_count) ==
ISER_QP_MAX_REQ_DTOS)
resume_tx = 1;
atomic_dec(&ib_conn->post_send_buf_count);
if (resume_tx) {
iser_dbg("%ld resuming tx\n",jiffies);
scsi_queue_work(conn->session->host, &conn->xmitwork);
}
if (tx_desc->type == ISCSI_TX_CONTROL) {
/* this arithmetic is legal by libiscsi dd_data allocation */
task = (void *) ((long)(void *)tx_desc -
sizeof(struct iscsi_task));
if (task->hdr->itt == RESERVED_ITT)
iscsi_put_task(task);
}
}
/**
* iscsi_tcp_task_xmit - xmit normal PDU task
* @task: iscsi command task
*
* We're expected to return 0 when everything was transmitted successfully,
* -EAGAIN if there's still data in the queue, or != 0 for any other kind
* of error.
*/
int iscsi_tcp_task_xmit(struct iscsi_task *task)
{
struct iscsi_conn *conn = task->conn;
struct iscsi_session *session = conn->session;
struct iscsi_r2t_info *r2t;
int rc = 0;
flush:
/* Flush any pending data first. */
rc = session->tt->xmit_pdu(task);
if (rc < 0)
return rc;
/* mgmt command */
if (!task->sc) {
if (task->hdr->itt == RESERVED_ITT)
iscsi_put_task(task);
return 0;
}
/* Are we done already? */
if (task->sc->sc_data_direction != DMA_TO_DEVICE)
return 0;
r2t = iscsi_tcp_get_curr_r2t(task);
if (r2t == NULL) {
/* Waiting for more R2Ts to arrive. */
ISCSI_DBG_TCP(conn, "no R2Ts yet\n");
return 0;
}
rc = conn->session->tt->alloc_pdu(task, ISCSI_OP_SCSI_DATA_OUT);
if (rc)
return rc;
iscsi_prep_data_out_pdu(task, r2t, (struct iscsi_data *) task->hdr);
ISCSI_DBG_TCP(conn, "sol dout %p [dsn %d itt 0x%x doff %d dlen %d]\n",
r2t, r2t->datasn - 1, task->hdr->itt,
r2t->data_offset + r2t->sent, r2t->data_count);
rc = conn->session->tt->init_pdu(task, r2t->data_offset + r2t->sent,
r2t->data_count);
if (rc) {
iscsi_conn_failure(conn, ISCSI_ERR_XMIT_FAILED);
return rc;
}
r2t->sent += r2t->data_count;
goto flush;
}
void iser_ctrl_comp(struct ib_cq *cq, struct ib_wc *wc)
{
struct iser_tx_desc *desc = iser_tx(wc->wr_cqe);
struct iscsi_task *task;
if (unlikely(wc->status != IB_WC_SUCCESS)) {
iser_err_comp(wc, "control");
return;
}
/* this arithmetic is legal by libiscsi dd_data allocation */
task = (void *)desc - sizeof(struct iscsi_task);
if (task->hdr->itt == RESERVED_ITT)
iscsi_put_task(task);
}
void iser_snd_completion(struct iser_tx_desc *tx_desc,
struct ib_conn *ib_conn)
{
struct iscsi_task *task;
struct iser_device *device = ib_conn->device;
if (tx_desc->type == ISCSI_TX_DATAOUT) {
ib_dma_unmap_single(device->ib_device, tx_desc->dma_addr,
ISER_HEADERS_LEN, DMA_TO_DEVICE);
kmem_cache_free(ig.desc_cache, tx_desc);
tx_desc = NULL;
}
if (tx_desc && tx_desc->type == ISCSI_TX_CONTROL) {
/* this arithmetic is legal by libiscsi dd_data allocation */
task = (void *) ((long)(void *)tx_desc -
sizeof(struct iscsi_task));
if (task->hdr->itt == RESERVED_ITT)
iscsi_put_task(task);
}
}
/**
* iser_rcv_dto_completion - recv DTO completion
*/
void iser_rcv_completion(struct iser_desc *rx_desc,
unsigned long dto_xfer_len)
{
struct iser_dto *dto = &rx_desc->dto;
struct iscsi_iser_conn *conn = dto->ib_conn->iser_conn;
struct iscsi_task *task;
struct iscsi_iser_task *iser_task;
struct iscsi_hdr *hdr;
char *rx_data = NULL;
int rx_data_len = 0;
unsigned char opcode;
hdr = &rx_desc->iscsi_header;
iser_dbg("op 0x%x itt 0x%x\n", hdr->opcode,hdr->itt);
if (dto_xfer_len > ISER_TOTAL_HEADERS_LEN) { /* we have data */
rx_data_len = dto_xfer_len - ISER_TOTAL_HEADERS_LEN;
rx_data = dto->regd[1]->virt_addr;
rx_data += dto->offset[1];
}
opcode = hdr->opcode & ISCSI_OPCODE_MASK;
if (opcode == ISCSI_OP_SCSI_CMD_RSP) {
spin_lock(&conn->iscsi_conn->session->lock);
task = iscsi_itt_to_ctask(conn->iscsi_conn, hdr->itt);
if (task)
__iscsi_get_task(task);
spin_unlock(&conn->iscsi_conn->session->lock);
if (!task)
iser_err("itt can't be matched to task!!! "
"conn %p opcode %d itt %d\n",
conn->iscsi_conn, opcode, hdr->itt);
else {
iser_task = task->dd_data;
iser_dbg("itt %d task %p\n",hdr->itt, task);
iser_task->status = ISER_TASK_STATUS_COMPLETED;
iser_task_rdma_finalize(iser_task);
iscsi_put_task(task);
}
}
iser_dto_buffs_release(dto);
iscsi_iser_recv(conn->iscsi_conn, hdr, rx_data, rx_data_len);
kfree(rx_desc->data);
kmem_cache_free(ig.desc_cache, rx_desc);
/* decrementing conn->post_recv_buf_count only --after-- freeing the *
* task eliminates the need to worry on tasks which are completed in *
* parallel to the execution of iser_conn_term. So the code that waits *
* for the posted rx bufs refcount to become zero handles everything */
atomic_dec(&conn->ib_conn->post_recv_buf_count);
/*
* if an unexpected PDU was received then the recv wr consumed must
* be replaced, this is done in the next send of a control-type PDU
*/
if (opcode == ISCSI_OP_NOOP_IN && hdr->itt == RESERVED_ITT) {
/* nop-in with itt = 0xffffffff */
atomic_inc(&conn->ib_conn->unexpected_pdu_count);
}
else if (opcode == ISCSI_OP_ASYNC_EVENT) {
/* asyncronous message */
atomic_inc(&conn->ib_conn->unexpected_pdu_count);
}
/* a reject PDU consumes the recv buf posted for the response */
}
