iscsi-target: Add base MaxXmitDataSegmentLength code

This patch introduces a new per connection MaxXmitDataSegmentLength
parameter value used to represent the outgoing MaxRecvDataSegmentLength
that is actually sent over the wire during iSCSI login response back
to the initiator side.

It also adds a new MaxXmitDataSegmentLength configfs attribute to
represent this value within the existing TPG parameter group under
/sys/kernel/config/target/iscsi/$TARGETNAME/$TPGT/param/

Cc: Mike Christie <michaelc@cs.wisc.edu>
Cc: Andy Grover <agrover@redhat.com>
Cc: Hannes Reinecke <hare@suse.de>
Cc: Roland Dreier <roland@purestorage.com>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>

4 files changed, 31 insertions, 0 deletions

diff --git a/drivers/target/iscsi/iscsi_target_configfs.c b/drivers/target/iscsi/iscsi_target_configfs.c
index f86833fcf33c..f491f969ab95 100644
--- a/drivers/target/iscsi/iscsi_target_configfs.c
+++ b/drivers/target/iscsi/iscsi_target_configfs.c
@@ -1034,6 +1034,9 @@ TPG_PARAM_ATTR(ImmediateData, S_IRUGO | S_IWUSR);
 DEF_TPG_PARAM(MaxRecvDataSegmentLength);
 TPG_PARAM_ATTR(MaxRecvDataSegmentLength, S_IRUGO | S_IWUSR);
 
+DEF_TPG_PARAM(MaxXmitDataSegmentLength);
+TPG_PARAM_ATTR(MaxXmitDataSegmentLength, S_IRUGO | S_IWUSR);
+
 DEF_TPG_PARAM(MaxBurstLength);
 TPG_PARAM_ATTR(MaxBurstLength, S_IRUGO | S_IWUSR);
 
@@ -1079,6 +1082,7 @@ static struct configfs_attribute *lio_target_tpg_param_attrs[] = {
         &iscsi_tpg_param_InitialR2T.attr,
         &iscsi_tpg_param_ImmediateData.attr,
         &iscsi_tpg_param_MaxRecvDataSegmentLength.attr,
+        &iscsi_tpg_param_MaxXmitDataSegmentLength.attr,
         &iscsi_tpg_param_MaxBurstLength.attr,
         &iscsi_tpg_param_FirstBurstLength.attr,
         &iscsi_tpg_param_DefaultTime2Wait.attr,
diff --git a/drivers/target/iscsi/iscsi_target_core.h b/drivers/target/iscsi/iscsi_target_core.h
index 8a908b28d8b2..b26611aa5ff3 100644
--- a/drivers/target/iscsi/iscsi_target_core.h
+++ b/drivers/target/iscsi/iscsi_target_core.h
@@ -239,6 +239,7 @@ struct iscsi_conn_ops {
         u8      HeaderDigest;                   /* [0,1] == [None,CRC32C] */
         u8      DataDigest;                     /* [0,1] == [None,CRC32C] */
         u32     MaxRecvDataSegmentLength;       /* [512..2**24-1] */
+        u32     MaxXmitDataSegmentLength;       /* [512..2**24-1] */
         u8      OFMarker;                       /* [0,1] == [No,Yes] */
         u8      IFMarker;                       /* [0,1] == [No,Yes] */
         u32     OFMarkInt;                      /* [1..65535] */
diff --git a/drivers/target/iscsi/iscsi_target_parameters.c b/drivers/target/iscsi/iscsi_target_parameters.c
index 0c4760fabfc0..40864ee70302 100644
--- a/drivers/target/iscsi/iscsi_target_parameters.c
+++ b/drivers/target/iscsi/iscsi_target_parameters.c
@@ -334,6 +334,13 @@ int iscsi_create_default_params(struct iscsi_param_list **param_list_ptr)
         if (!param)
                 goto out;
 
+        param = iscsi_set_default_param(pl, MAXXMITDATASEGMENTLENGTH,
+                        INITIAL_MAXXMITDATASEGMENTLENGTH,
+                        PHASE_OPERATIONAL, SCOPE_CONNECTION_ONLY, SENDER_BOTH,
+                        TYPERANGE_512_TO_16777215, USE_ALL);
+        if (!param)
+                goto out;
+
         param = iscsi_set_default_param(pl, MAXRECVDATASEGMENTLENGTH,
                         INITIAL_MAXRECVDATASEGMENTLENGTH,
                         PHASE_OPERATIONAL, SCOPE_CONNECTION_ONLY, SENDER_BOTH,
@@ -467,6 +474,8 @@ int iscsi_set_keys_to_negotiate(
                         SET_PSTATE_NEGOTIATE(param);
                 } else if (!strcmp(param->name, MAXRECVDATASEGMENTLENGTH)) {
                         SET_PSTATE_NEGOTIATE(param);
+                } else if (!strcmp(param->name, MAXXMITDATASEGMENTLENGTH)) {
+                        continue;
                 } else if (!strcmp(param->name, MAXBURSTLENGTH)) {
                         SET_PSTATE_NEGOTIATE(param);
                 } else if (!strcmp(param->name, FIRSTBURSTLENGTH)) {
@@ -1720,6 +1729,18 @@ void iscsi_set_connection_parameters(
         pr_debug("---------------------------------------------------"
                         "---------------\n");
         list_for_each_entry(param, &param_list->param_list, p_list) {
+                /*
+                 * Special case to set MAXXMITDATASEGMENTLENGTH from the
+                 * target requested MaxRecvDataSegmentLength, even though
+                 * this key is not sent over the wire.
+                 */
+                if (!strcmp(param->name, MAXXMITDATASEGMENTLENGTH)) {
+                        ops->MaxXmitDataSegmentLength =
+                                simple_strtoul(param->value, &tmpptr, 0);
+                        pr_debug("MaxXmitDataSegmentLength:     %s\n",
+                                param->value);
+                }
+
                 if (!IS_PSTATE_ACCEPTOR(param) && !IS_PSTATE_PROPOSER(param))
                         continue;
                 if (!strcmp(param->name, AUTHMETHOD)) {
diff --git a/drivers/target/iscsi/iscsi_target_parameters.h b/drivers/target/iscsi/iscsi_target_parameters.h
index 6a37fd6f1285..77a28b589d56 100644
--- a/drivers/target/iscsi/iscsi_target_parameters.h
+++ b/drivers/target/iscsi/iscsi_target_parameters.h
@@ -70,6 +70,7 @@ extern void iscsi_set_session_parameters(struct iscsi_sess_ops *,
 #define INITIALR2T                      "InitialR2T"
 #define IMMEDIATEDATA                   "ImmediateData"
 #define MAXRECVDATASEGMENTLENGTH        "MaxRecvDataSegmentLength"
+#define MAXXMITDATASEGMENTLENGTH        "MaxXmitDataSegmentLength"
 #define MAXBURSTLENGTH                  "MaxBurstLength"
 #define FIRSTBURSTLENGTH                "FirstBurstLength"
 #define DEFAULTTIME2WAIT                "DefaultTime2Wait"
@@ -113,6 +114,10 @@ extern void iscsi_set_session_parameters(struct iscsi_sess_ops *,
 #define INITIAL_INITIALR2T                      YES
 #define INITIAL_IMMEDIATEDATA                   YES
 #define INITIAL_MAXRECVDATASEGMENTLENGTH        "8192"
+/*
+ * Match outgoing MXDSL default to incoming Open-iSCSI default
+ */
+#define INITIAL_MAXXMITDATASEGMENTLENGTH        "262144"
 #define INITIAL_MAXBURSTLENGTH                  "262144"
 #define INITIAL_FIRSTBURSTLENGTH                "65536"
 #define INITIAL_DEFAULTTIME2WAIT                "2"