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IB/iser: Return error code when PDUs may not be sent 

iSER limits the number of outstanding PDUs to send. When this threshold
is reached, it should return an error code (-ENOBUFS) instead of setting
the suspend_tx bit (which should be used only by libiscsi).

Signed-off-by: Erez Zilber <erezz@voltaire.com>
Signed-off-by: Roland Dreier <rolandd@cisco.com>
This commit is contained in:
Erez Zilber 2007-01-07 12:28:02 +02:00 committed by Roland Dreier
parent 46707e96b7
commit f0938401f2
2 changed files with 14 additions and 16 deletions
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4
drivers/infiniband/ulp/iser/iscsi_iser.c
View File

@ -177,7 +177,7 @@ iscsi_iser_mtask_xmit(struct iscsi_conn *conn,
* - if yes, the mtask is recycled at iscsi_complete_pdu
* - if no, the mtask is recycled at iser_snd_completion
*/
if (error && error != -EAGAIN)
if (error && error != -ENOBUFS)
iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
return error;
@ -241,7 +241,7 @@ iscsi_iser_ctask_xmit(struct iscsi_conn *conn,
error = iscsi_iser_ctask_xmit_unsol_data(conn, ctask);
iscsi_iser_ctask_xmit_exit:
if (error && error != -EAGAIN)
if (error && error != -ENOBUFS)
iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
return error;
}

26
drivers/infiniband/ulp/iser/iser_initiator.c
View File

@ -304,18 +304,14 @@ int iser_conn_set_full_featured_mode(struct iscsi_conn *conn)
static int
iser_check_xmit(struct iscsi_conn *conn, void *task)
{
int rc = 0;
struct iscsi_iser_conn *iser_conn = conn->dd_data;
write_lock_bh(conn->recv_lock);
if (atomic_read(&iser_conn->ib_conn->post_send_buf_count) ==
ISER_QP_MAX_REQ_DTOS) {
iser_dbg("%ld can't xmit task %p, suspending tx\n",jiffies,task);
set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
rc = -EAGAIN;
iser_dbg("%ld can't xmit task %p\n",jiffies,task);
return -ENOBUFS;
}
write_unlock_bh(conn->recv_lock);
return rc;
return 0;
}
@ -340,7 +336,7 @@ int iser_send_command(struct iscsi_conn *conn,
return -EPERM;
}
if (iser_check_xmit(conn, ctask))
return -EAGAIN;
return -ENOBUFS;
edtl = ntohl(hdr->data_length);
@ -426,7 +422,7 @@ int iser_send_data_out(struct iscsi_conn *conn,
}
if (iser_check_xmit(conn, ctask))
return -EAGAIN;
return -ENOBUFS;
itt = ntohl(hdr->itt);
data_seg_len = ntoh24(hdr->dlength);
@ -498,7 +494,7 @@ int iser_send_control(struct iscsi_conn *conn,
}
if (iser_check_xmit(conn,mtask))
return -EAGAIN;
return -ENOBUFS;
/* build the tx desc regd header and add it to the tx desc dto */
mdesc->type = ISCSI_TX_CONTROL;
@ -605,6 +601,7 @@ void iser_snd_completion(struct iser_desc *tx_desc)
struct iscsi_iser_conn *iser_conn = ib_conn->iser_conn;
struct iscsi_conn *conn = iser_conn->iscsi_conn;
struct iscsi_mgmt_task *mtask;
int resume_tx = 0;
iser_dbg("Initiator, Data sent dto=0x%p\n", dto);
@ -613,15 +610,16 @@ void iser_snd_completion(struct iser_desc *tx_desc)
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);
write_lock(conn->recv_lock);
if (conn->suspend_tx) {
if (resume_tx) {
iser_dbg("%ld resuming tx\n",jiffies);
clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
scsi_queue_work(conn->session->host, &conn->xmitwork);
}
write_unlock(conn->recv_lock);
if (tx_desc->type == ISCSI_TX_CONTROL) {
/* this arithmetic is legal by libiscsi dd_data allocation */