[SCSI] libiscsi, iscsi_tcp, iscsi_iser: check that burst lengths are valid.
iSCSI RFC states that the first burst length must be smaller than the
max burst length. We currently assume targets will be good, but that may
not be the case, so this patch adds a check.
This patch also moves the unsol data out offset to the lib so the LLDs
do not have to track it.
Signed-off-by: Mike Christie <michaelc@cs.wisc.edu>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
diff --git a/drivers/infiniband/ulp/iser/iscsi_iser.c b/drivers/infiniband/ulp/iser/iscsi_iser.c
index 1437d7e..101e407 100644
--- a/drivers/infiniband/ulp/iser/iscsi_iser.c
+++ b/drivers/infiniband/ulp/iser/iscsi_iser.c
@@ -141,18 +141,11 @@
if (sc->sc_data_direction == DMA_TO_DEVICE) {
BUG_ON(ctask->total_length == 0);
- /* bytes to be sent via RDMA operations */
- iser_ctask->rdma_data_count = ctask->total_length -
- ctask->imm_count -
- ctask->unsol_count;
- debug_scsi("cmd [itt %x total %d imm %d unsol_data %d "
- "rdma_data %d]\n",
+ debug_scsi("cmd [itt %x total %d imm %d unsol_data %d\n",
ctask->itt, ctask->total_length, ctask->imm_count,
- ctask->unsol_count, iser_ctask->rdma_data_count);
- } else
- /* bytes to be sent via RDMA operations */
- iser_ctask->rdma_data_count = ctask->total_length;
+ ctask->unsol_count);
+ }
iser_ctask_rdma_init(iser_ctask);
}
@@ -196,13 +189,10 @@
{
struct iscsi_data hdr;
int error = 0;
- struct iscsi_iser_cmd_task *iser_ctask = ctask->dd_data;
/* Send data-out PDUs while there's still unsolicited data to send */
while (ctask->unsol_count > 0) {
- iscsi_prep_unsolicit_data_pdu(ctask, &hdr,
- iser_ctask->rdma_data_count);
-
+ iscsi_prep_unsolicit_data_pdu(ctask, &hdr);
debug_scsi("Sending data-out: itt 0x%x, data count %d\n",
hdr.itt, ctask->data_count);
diff --git a/drivers/infiniband/ulp/iser/iscsi_iser.h b/drivers/infiniband/ulp/iser/iscsi_iser.h
index 3350ba6..7c3d0c9 100644
--- a/drivers/infiniband/ulp/iser/iscsi_iser.h
+++ b/drivers/infiniband/ulp/iser/iscsi_iser.h
@@ -257,7 +257,6 @@
struct iscsi_iser_cmd_task {
struct iser_desc desc;
struct iscsi_iser_conn *iser_conn;
- int rdma_data_count;/* RDMA bytes */
enum iser_task_status status;
int command_sent; /* set if command sent */
int dir[ISER_DIRS_NUM]; /* set if dir use*/
diff --git a/drivers/scsi/iscsi_tcp.c b/drivers/scsi/iscsi_tcp.c
index 058f094..a97a3a4 100644
--- a/drivers/scsi/iscsi_tcp.c
+++ b/drivers/scsi/iscsi_tcp.c
@@ -1264,19 +1264,6 @@
r2t->data_count);
}
-static void
-iscsi_unsolicit_data_init(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
-{
- struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
- struct iscsi_data_task *dtask;
-
- dtask = tcp_ctask->dtask = &tcp_ctask->unsol_dtask;
- iscsi_prep_unsolicit_data_pdu(ctask, &dtask->hdr,
- tcp_ctask->r2t_data_count);
- iscsi_buf_init_iov(&tcp_ctask->headbuf, (char*)&dtask->hdr,
- sizeof(struct iscsi_hdr));
-}
-
/**
* iscsi_tcp_cmd_init - Initialize iSCSI SCSI_READ or SCSI_WRITE commands
* @conn: iscsi connection
@@ -1326,14 +1313,11 @@
if (ctask->unsol_count)
tcp_ctask->xmstate |= XMSTATE_UNS_HDR |
XMSTATE_UNS_INIT;
- tcp_ctask->r2t_data_count = ctask->total_length -
- ctask->imm_count -
- ctask->unsol_count;
- debug_scsi("cmd [itt 0x%x total %d imm %d imm_data %d "
- "r2t_data %d]\n",
+ debug_scsi("cmd [itt 0x%x total %d imm_data %d "
+ "unsol count %d, unsol offset %d]\n",
ctask->itt, ctask->total_length, ctask->imm_count,
- ctask->unsol_count, tcp_ctask->r2t_data_count);
+ ctask->unsol_count, ctask->unsol_offset);
} else
tcp_ctask->xmstate = XMSTATE_R_HDR;
@@ -1531,8 +1515,10 @@
tcp_ctask->xmstate |= XMSTATE_UNS_DATA;
if (tcp_ctask->xmstate & XMSTATE_UNS_INIT) {
- iscsi_unsolicit_data_init(conn, ctask);
- dtask = tcp_ctask->dtask;
+ dtask = tcp_ctask->dtask = &tcp_ctask->unsol_dtask;
+ iscsi_prep_unsolicit_data_pdu(ctask, &dtask->hdr);
+ iscsi_buf_init_iov(&tcp_ctask->headbuf, (char*)&dtask->hdr,
+ sizeof(struct iscsi_hdr));
if (conn->hdrdgst_en)
iscsi_hdr_digest(conn, &tcp_ctask->headbuf,
(u8*)dtask->hdrext);
@@ -1720,7 +1706,6 @@
* Done with this R2T. Check if there are more
* outstanding R2Ts ready to be processed.
*/
- BUG_ON(tcp_ctask->r2t_data_count - r2t->data_length < 0);
if (conn->datadgst_en) {
rc = iscsi_digest_final_send(conn, ctask, &dtask->digestbuf,
&dtask->digest, 1);
@@ -1732,7 +1717,6 @@
debug_tcp("r2t done dout digest 0x%x\n", dtask->digest);
}
- tcp_ctask->r2t_data_count -= r2t->data_length;
tcp_ctask->r2t = NULL;
spin_lock_bh(&session->lock);
__kfifo_put(tcp_ctask->r2tpool.queue, (void*)&r2t, sizeof(void*));
diff --git a/drivers/scsi/iscsi_tcp.h b/drivers/scsi/iscsi_tcp.h
index 6a4ee70..aace8f7 100644
--- a/drivers/scsi/iscsi_tcp.h
+++ b/drivers/scsi/iscsi_tcp.h
@@ -157,7 +157,6 @@
struct scatterlist *bad_sg; /* assert statement */
int sg_count; /* SG's to process */
uint32_t exp_r2tsn;
- int r2t_data_count; /* R2T Data-Out bytes */
int data_offset;
struct iscsi_r2t_info *r2t; /* in progress R2T */
struct iscsi_queue r2tpool;
diff --git a/drivers/scsi/libiscsi.c b/drivers/scsi/libiscsi.c
index 5884cd2..a7c6e70 100644
--- a/drivers/scsi/libiscsi.c
+++ b/drivers/scsi/libiscsi.c
@@ -68,8 +68,7 @@
EXPORT_SYMBOL_GPL(iscsi_check_assign_cmdsn);
void iscsi_prep_unsolicit_data_pdu(struct iscsi_cmd_task *ctask,
- struct iscsi_data *hdr,
- int transport_data_cnt)
+ struct iscsi_data *hdr)
{
struct iscsi_conn *conn = ctask->conn;
@@ -82,14 +81,12 @@
hdr->itt = ctask->hdr->itt;
hdr->exp_statsn = cpu_to_be32(conn->exp_statsn);
-
- hdr->offset = cpu_to_be32(ctask->total_length -
- transport_data_cnt -
- ctask->unsol_count);
+ hdr->offset = cpu_to_be32(ctask->unsol_offset);
if (ctask->unsol_count > conn->max_xmit_dlength) {
hton24(hdr->dlength, conn->max_xmit_dlength);
ctask->data_count = conn->max_xmit_dlength;
+ ctask->unsol_offset += ctask->data_count;
hdr->flags = 0;
} else {
hton24(hdr->dlength, ctask->unsol_count);
@@ -125,6 +122,7 @@
memcpy(hdr->cdb, sc->cmnd, sc->cmd_len);
memset(&hdr->cdb[sc->cmd_len], 0, MAX_COMMAND_SIZE - sc->cmd_len);
+ ctask->data_count = 0;
if (sc->sc_data_direction == DMA_TO_DEVICE) {
hdr->flags |= ISCSI_FLAG_CMD_WRITE;
/*
@@ -143,6 +141,7 @@
*/
ctask->imm_count = 0;
ctask->unsol_count = 0;
+ ctask->unsol_offset = 0;
ctask->unsol_datasn = 0;
if (session->imm_data_en) {
@@ -156,9 +155,12 @@
} else
zero_data(ctask->hdr->dlength);
- if (!session->initial_r2t_en)
+ if (!session->initial_r2t_en) {
ctask->unsol_count = min(session->first_burst,
ctask->total_length) - ctask->imm_count;
+ ctask->unsol_offset = ctask->imm_count;
+ }
+
if (!ctask->unsol_count)
/* No unsolicit Data-Out's */
ctask->hdr->flags |= ISCSI_FLAG_CMD_FINAL;
@@ -1520,11 +1522,18 @@
struct iscsi_conn *conn = cls_conn->dd_data;
struct iscsi_session *session = conn->session;
- if (session == NULL) {
+ if (!session) {
printk(KERN_ERR "iscsi: can't start unbound connection\n");
return -EPERM;
}
+ if (session->first_burst > session->max_burst) {
+ printk("iscsi: invalid burst lengths: "
+ "first_burst %d max_burst %d\n",
+ session->first_burst, session->max_burst);
+ return -EINVAL;
+ }
+
spin_lock_bh(&session->lock);
conn->c_stage = ISCSI_CONN_STARTED;
session->state = ISCSI_STATE_LOGGED_IN;
diff --git a/include/scsi/libiscsi.h b/include/scsi/libiscsi.h
index 41904f6..4900650 100644
--- a/include/scsi/libiscsi.h
+++ b/include/scsi/libiscsi.h
@@ -102,6 +102,8 @@
uint32_t unsol_datasn;
int imm_count; /* imm-data (bytes) */
int unsol_count; /* unsolicited (bytes)*/
+ /* offset in unsolicited stream (bytes); */
+ int unsol_offset;
int data_count; /* remaining Data-Out */
struct scsi_cmnd *sc; /* associated SCSI cmd*/
int total_length;
@@ -290,8 +292,7 @@
extern int iscsi_check_assign_cmdsn(struct iscsi_session *,
struct iscsi_nopin *);
extern void iscsi_prep_unsolicit_data_pdu(struct iscsi_cmd_task *,
- struct iscsi_data *hdr,
- int transport_data_cnt);
+ struct iscsi_data *hdr);
extern int iscsi_conn_send_pdu(struct iscsi_cls_conn *, struct iscsi_hdr *,
char *, uint32_t);
extern int iscsi_complete_pdu(struct iscsi_conn *, struct iscsi_hdr *,
