[SCSI] iscsi_tcp: enable sg chaining

The previous patches converted iscsi_tcp to support sg chaining.
This patch sets the proper flags and sets sg_table size to
4096. This allows fs io to be capped at max_sectors, but passthrough
IO to be limited by some other part of the kernel.

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

2 files changed, 3 insertions, 5 deletions

diff --git a/drivers/scsi/iscsi_tcp.c b/drivers/scsi/iscsi_tcp.c
index 65df908019fd..84c4a5026bcb 100644
--- a/drivers/scsi/iscsi_tcp.c
+++ b/drivers/scsi/iscsi_tcp.c
@@ -1928,13 +1928,14 @@ static struct scsi_host_template iscsi_sht = {
         .queuecommand           = iscsi_queuecommand,
         .change_queue_depth     = iscsi_change_queue_depth,
         .can_queue              = ISCSI_DEF_XMIT_CMDS_MAX - 1,
-        .sg_tablesize           = ISCSI_SG_TABLESIZE,
+        .sg_tablesize           = 4096,
         .max_sectors            = 0xFFFF,
         .cmd_per_lun            = ISCSI_DEF_CMD_PER_LUN,
         .eh_abort_handler       = iscsi_eh_abort,
         .eh_device_reset_handler= iscsi_eh_device_reset,
         .eh_host_reset_handler  = iscsi_eh_host_reset,
         .use_clustering         = DISABLE_CLUSTERING,
+        .use_sg_chaining        = ENABLE_SG_CHAINING,
         .slave_configure        = iscsi_tcp_slave_configure,
         .proc_name              = "iscsi_tcp",
         .this_id                = -1,
@@ -1974,7 +1975,7 @@ static struct iscsi_transport iscsi_tcp_transport = {
         .host_template          = &iscsi_sht,
         .conndata_size          = sizeof(struct iscsi_conn),
         .max_conn               = 1,
-        .max_cmd_len            = ISCSI_TCP_MAX_CMD_LEN,
+        .max_cmd_len            = 16,
         /* session management */
         .create_session         = iscsi_tcp_session_create,
         .destroy_session        = iscsi_tcp_session_destroy,
diff --git a/drivers/scsi/iscsi_tcp.h b/drivers/scsi/iscsi_tcp.h
index 893cd2e1701e..ed0b991d1e72 100644
--- a/drivers/scsi/iscsi_tcp.h
+++ b/drivers/scsi/iscsi_tcp.h
@@ -24,9 +24,6 @@
 
 #include <scsi/libiscsi.h>
 
-#define ISCSI_SG_TABLESIZE              SG_ALL
-#define ISCSI_TCP_MAX_CMD_LEN           16
-
 struct crypto_hash;
 struct socket;
 struct iscsi_tcp_conn;