kpriv/linux-hardened
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity

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

Browse source 
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
Show stats Download patch file Download diff file Expand all files Collapse all files

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 */