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-rw-r--r--drivers/scsi/iscsi_tcp.c83
-rw-r--r--drivers/scsi/iscsi_tcp.h2
-rw-r--r--drivers/scsi/libiscsi.c10
-rw-r--r--include/scsi/libiscsi.h8
4 files changed, 38 insertions, 65 deletions
diff --git a/drivers/scsi/iscsi_tcp.c b/drivers/scsi/iscsi_tcp.c
index b6c68be6b866..aa20adc79f02 100644
--- a/drivers/scsi/iscsi_tcp.c
+++ b/drivers/scsi/iscsi_tcp.c
@@ -511,13 +511,28 @@ iscsi_tcp_hdr_recv(struct iscsi_conn *conn)
break;
case ISCSI_OP_LOGIN_RSP:
case ISCSI_OP_TEXT_RSP:
- case ISCSI_OP_LOGOUT_RSP:
- case ISCSI_OP_NOOP_IN:
case ISCSI_OP_REJECT:
case ISCSI_OP_ASYNC_EVENT:
+ /*
+ * It is possible that we could get a PDU with a buffer larger
+ * than 8K, but there are no targets that currently do this.
+ * For now we fail until we find a vendor that needs it
+ */
+ if (DEFAULT_MAX_RECV_DATA_SEGMENT_LENGTH <
+ tcp_conn->in.datalen) {
+ printk(KERN_ERR "iscsi_tcp: received buffer of len %u "
+ "but conn buffer is only %u (opcode %0x)\n",
+ tcp_conn->in.datalen,
+ DEFAULT_MAX_RECV_DATA_SEGMENT_LENGTH, opcode);
+ rc = ISCSI_ERR_PROTO;
+ break;
+ }
+
if (tcp_conn->in.datalen)
goto copy_hdr;
/* fall through */
+ case ISCSI_OP_LOGOUT_RSP:
+ case ISCSI_OP_NOOP_IN:
case ISCSI_OP_SCSI_TMFUNC_RSP:
rc = iscsi_complete_pdu(conn, hdr, NULL, 0);
break;
@@ -625,9 +640,9 @@ iscsi_ctask_copy(struct iscsi_tcp_conn *tcp_conn, struct iscsi_cmd_task *ctask,
* byte counters.
**/
static inline int
-iscsi_tcp_copy(struct iscsi_tcp_conn *tcp_conn)
+iscsi_tcp_copy(struct iscsi_conn *conn)
{
- void *buf = tcp_conn->data;
+ struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
int buf_size = tcp_conn->in.datalen;
int buf_left = buf_size - tcp_conn->data_copied;
int size = min(tcp_conn->in.copy, buf_left);
@@ -638,7 +653,7 @@ iscsi_tcp_copy(struct iscsi_tcp_conn *tcp_conn)
BUG_ON(size <= 0);
rc = skb_copy_bits(tcp_conn->in.skb, tcp_conn->in.offset,
- (char*)buf + tcp_conn->data_copied, size);
+ (char*)conn->data + tcp_conn->data_copied, size);
BUG_ON(rc);
tcp_conn->in.offset += size;
@@ -785,22 +800,21 @@ iscsi_data_recv(struct iscsi_conn *conn)
spin_unlock(&conn->session->lock);
case ISCSI_OP_TEXT_RSP:
case ISCSI_OP_LOGIN_RSP:
- case ISCSI_OP_NOOP_IN:
case ISCSI_OP_ASYNC_EVENT:
case ISCSI_OP_REJECT:
/*
* Collect data segment to the connection's data
* placeholder
*/
- if (iscsi_tcp_copy(tcp_conn)) {
+ if (iscsi_tcp_copy(conn)) {
rc = -EAGAIN;
goto exit;
}
- rc = iscsi_complete_pdu(conn, tcp_conn->in.hdr, tcp_conn->data,
+ rc = iscsi_complete_pdu(conn, tcp_conn->in.hdr, conn->data,
tcp_conn->in.datalen);
if (!rc && conn->datadgst_en && opcode != ISCSI_OP_LOGIN_RSP)
- iscsi_recv_digest_update(tcp_conn, tcp_conn->data,
+ iscsi_recv_digest_update(tcp_conn, conn->data,
tcp_conn->in.datalen);
break;
default:
@@ -1911,21 +1925,9 @@ iscsi_tcp_conn_create(struct iscsi_cls_session *cls_session, uint32_t conn_idx)
tcp_conn->in_progress = IN_PROGRESS_WAIT_HEADER;
/* initial operational parameters */
tcp_conn->hdr_size = sizeof(struct iscsi_hdr);
- tcp_conn->data_size = DEFAULT_MAX_RECV_DATA_SEGMENT_LENGTH;
-
- /* allocate initial PDU receive place holder */
- if (tcp_conn->data_size <= PAGE_SIZE)
- tcp_conn->data = kmalloc(tcp_conn->data_size, GFP_KERNEL);
- else
- tcp_conn->data = (void*)__get_free_pages(GFP_KERNEL,
- get_order(tcp_conn->data_size));
- if (!tcp_conn->data)
- goto max_recv_dlenght_alloc_fail;
return cls_conn;
-max_recv_dlenght_alloc_fail:
- kfree(tcp_conn);
tcp_conn_alloc_fail:
iscsi_conn_teardown(cls_conn);
return NULL;
@@ -1973,12 +1975,6 @@ iscsi_tcp_conn_destroy(struct iscsi_cls_conn *cls_conn)
crypto_free_tfm(tcp_conn->data_rx_tfm);
}
- /* free conn->data, size = MaxRecvDataSegmentLength */
- if (tcp_conn->data_size <= PAGE_SIZE)
- kfree(tcp_conn->data);
- else
- free_pages((unsigned long)tcp_conn->data,
- get_order(tcp_conn->data_size));
kfree(tcp_conn);
}
@@ -2131,39 +2127,6 @@ iscsi_conn_set_param(struct iscsi_cls_conn *cls_conn, enum iscsi_param param,
int value;
switch(param) {
- case ISCSI_PARAM_MAX_RECV_DLENGTH: {
- char *saveptr = tcp_conn->data;
- gfp_t flags = GFP_KERNEL;
-
- sscanf(buf, "%d", &value);
- if (tcp_conn->data_size >= value) {
- iscsi_set_param(cls_conn, param, buf, buflen);
- break;
- }
-
- spin_lock_bh(&session->lock);
- if (conn->stop_stage == STOP_CONN_RECOVER)
- flags = GFP_ATOMIC;
- spin_unlock_bh(&session->lock);
-
- if (value <= PAGE_SIZE)
- tcp_conn->data = kmalloc(value, flags);
- else
- tcp_conn->data = (void*)__get_free_pages(flags,
- get_order(value));
- if (tcp_conn->data == NULL) {
- tcp_conn->data = saveptr;
- return -ENOMEM;
- }
- if (tcp_conn->data_size <= PAGE_SIZE)
- kfree(saveptr);
- else
- free_pages((unsigned long)saveptr,
- get_order(tcp_conn->data_size));
- iscsi_set_param(cls_conn, param, buf, buflen);
- tcp_conn->data_size = value;
- break;
- }
case ISCSI_PARAM_HDRDGST_EN:
iscsi_set_param(cls_conn, param, buf, buflen);
tcp_conn->hdr_size = sizeof(struct iscsi_hdr);
diff --git a/drivers/scsi/iscsi_tcp.h b/drivers/scsi/iscsi_tcp.h
index 808302832e68..6a4ee704e46e 100644
--- a/drivers/scsi/iscsi_tcp.h
+++ b/drivers/scsi/iscsi_tcp.h
@@ -78,8 +78,6 @@ struct iscsi_tcp_conn {
char hdrext[4*sizeof(__u16) +
sizeof(__u32)];
int data_copied;
- char *data; /* data placeholder */
- int data_size; /* actual recv_dlength */
int stop_stage; /* conn_stop() flag: *
* stop to recover, *
* stop to terminate */
diff --git a/drivers/scsi/libiscsi.c b/drivers/scsi/libiscsi.c
index c989bc6180b3..03b3dee49009 100644
--- a/drivers/scsi/libiscsi.c
+++ b/drivers/scsi/libiscsi.c
@@ -360,6 +360,10 @@ int __iscsi_complete_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
switch(opcode) {
case ISCSI_OP_LOGOUT_RSP:
+ if (datalen) {
+ rc = ISCSI_ERR_PROTO;
+ break;
+ }
conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
/* fall through */
case ISCSI_OP_LOGIN_RSP:
@@ -383,7 +387,7 @@ int __iscsi_complete_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
iscsi_tmf_rsp(conn, hdr);
break;
case ISCSI_OP_NOOP_IN:
- if (hdr->ttt != ISCSI_RESERVED_TAG) {
+ if (hdr->ttt != ISCSI_RESERVED_TAG || datalen) {
rc = ISCSI_ERR_PROTO;
break;
}
@@ -1405,7 +1409,7 @@ iscsi_conn_setup(struct iscsi_cls_session *cls_session, uint32_t conn_idx)
data = kmalloc(DEFAULT_MAX_RECV_DATA_SEGMENT_LENGTH, GFP_KERNEL);
if (!data)
goto login_mtask_data_alloc_fail;
- conn->login_mtask->data = data;
+ conn->login_mtask->data = conn->data = data;
init_timer(&conn->tmabort_timer);
mutex_init(&conn->xmitmutex);
@@ -1477,7 +1481,7 @@ void iscsi_conn_teardown(struct iscsi_cls_conn *cls_conn)
}
spin_lock_bh(&session->lock);
- kfree(conn->login_mtask->data);
+ kfree(conn->data);
__kfifo_put(session->mgmtpool.queue, (void*)&conn->login_mtask,
sizeof(void*));
list_del(&conn->item);
diff --git a/include/scsi/libiscsi.h b/include/scsi/libiscsi.h
index 3f69f7e58f89..41904f611d12 100644
--- a/include/scsi/libiscsi.h
+++ b/include/scsi/libiscsi.h
@@ -135,6 +135,14 @@ struct iscsi_conn {
int id; /* CID */
struct list_head item; /* maintains list of conns */
int c_stage; /* connection state */
+ /*
+ * Preallocated buffer for pdus that have data but do not
+ * originate from scsi-ml. We never have two pdus using the
+ * buffer at the same time. It is only allocated to
+ * the default max recv size because the pdus we support
+ * should always fit in this buffer
+ */
+ char *data;
struct iscsi_mgmt_task *login_mtask; /* mtask used for login/text */
struct iscsi_mgmt_task *mtask; /* xmit mtask in progress */
struct iscsi_cmd_task *ctask; /* xmit ctask in progress */
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