[SCSI] iscsi bugfixes: reduce memory allocations

We currently try to allocate a max_recv_data_segment_length
which can be very large (default is 64K), and common uses
are up to 1MB. It is very very difficult to allocte this
much contiguous memory and it turns out we never even use it.
We really only need a couple of pages, so this patch has us
allocates just what we know what we need today.

Later if vendors start adding vendor specific data and
we need to handle large buffers we can do this, but for
the last 4 years we have not seen anyone do this or request
it.

Signed-off-by: Mike Christie <michaelc@cs.wisc.edu>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>

1 files changed, 23 insertions, 60 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);