Support for extended CDBs in iscsi.
All we need is to check if command spills over 16 bytes then allocate
an iscsi-extended-header for the leftovers.
Signed-off-by: Boaz Harrosh <[EMAIL PROTECTED]>
---
drivers/scsi/iscsi_tcp.c | 2 +-
drivers/scsi/libiscsi.c | 56 ++++++++++++++++++++++++++++++++++++++++----
include/scsi/iscsi_proto.h | 6 +++-
3 files changed, 56 insertions(+), 8 deletions(-)
diff --git a/drivers/scsi/iscsi_tcp.c b/drivers/scsi/iscsi_tcp.c
index 8a17867..ee7acfa 100644
--- a/drivers/scsi/iscsi_tcp.c
+++ b/drivers/scsi/iscsi_tcp.c
@@ -1975,7 +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 = 16,
+ .max_cmd_len = 260,
/* session management */
.create_session = iscsi_tcp_session_create,
.destroy_session = iscsi_tcp_session_destroy,
diff --git a/drivers/scsi/libiscsi.c b/drivers/scsi/libiscsi.c
index cfffabd..498cea3 100644
--- a/drivers/scsi/libiscsi.c
+++ b/drivers/scsi/libiscsi.c
@@ -137,6 +137,45 @@ static int iscsi_add_hdr(struct iscsi_cmd_task *ctask,
unsigned len)
return 0;
}
+/*
+ * make an extended cdb AHS
+ */
+static int iscsi_prep_ecdb_ahs(struct iscsi_cmd_task *ctask)
+{
+ struct scsi_cmnd *cmd = ctask->sc;
+ unsigned rlen, pad_len;
+ unsigned short ahslength;
+ struct iscsi_ecdb_ahdr *ecdb_ahdr;
+ int rc;
+
+ ecdb_ahdr = iscsi_next_hdr(ctask);
+ rlen = cmd->cmd_len - ISCSI_CDB_SIZE;
+
+ BUG_ON(rlen > sizeof(ecdb_ahdr->ecdb));
+ ahslength = rlen + sizeof(ecdb_ahdr->reserved);
+
+ pad_len = iscsi_padding(rlen);
+
+ rc = iscsi_add_hdr(ctask, sizeof(ecdb_ahdr->ahslength) +
+ sizeof(ecdb_ahdr->ahstype) + ahslength + pad_len);
+ if (rc)
+ return rc;
+
+ if (pad_len)
+ memset(&ecdb_ahdr->ecdb[rlen], 0, pad_len);
+
+ ecdb_ahdr->ahslength = cpu_to_be16(ahslength);
+ ecdb_ahdr->ahstype = ISCSI_AHSTYPE_CDB;
+ ecdb_ahdr->reserved = 0;
+ memcpy(ecdb_ahdr->ecdb, cmd->cmnd + ISCSI_CDB_SIZE, rlen);
+
+ debug_scsi("iscsi_prep_ecdb_ahs: varlen_cdb_len %d "
+ "rlen %d pad_len %d ahs_length %d iscsi_headers_size %u\n",
+ cmd->cmd_len, rlen, pad_len, ahslength, ctask->hdr_len);
+
+ return 0;
+}
+
/**
* iscsi_prep_scsi_cmd_pdu - prep iscsi scsi cmd pdu
* @ctask: iscsi cmd task
@@ -150,7 +189,7 @@ static int iscsi_prep_scsi_cmd_pdu(struct iscsi_cmd_task
*ctask)
struct iscsi_session *session = conn->session;
struct iscsi_cmd *hdr = ctask->hdr;
struct scsi_cmnd *sc = ctask->sc;
- unsigned hdrlength;
+ unsigned hdrlength, cmd_len;
int rc;
ctask->hdr_len = 0;
@@ -165,10 +204,17 @@ static int iscsi_prep_scsi_cmd_pdu(struct iscsi_cmd_task
*ctask)
hdr->cmdsn = cpu_to_be32(session->cmdsn);
session->cmdsn++;
hdr->exp_statsn = cpu_to_be32(conn->exp_statsn);
- memcpy(hdr->cdb, sc->cmnd, sc->cmd_len);
- if (sc->cmd_len < MAX_COMMAND_SIZE)
- memset(&hdr->cdb[sc->cmd_len], 0,
- MAX_COMMAND_SIZE - sc->cmd_len);
+ cmd_len = sc->cmd_len;
+ if (cmd_len < ISCSI_CDB_SIZE)
+ memset(&hdr->cdb[cmd_len], 0,
+ ISCSI_CDB_SIZE - cmd_len);
+ else if (cmd_len > ISCSI_CDB_SIZE) {
+ rc = iscsi_prep_ecdb_ahs(ctask);
+ if (rc)
+ return rc;
+ cmd_len = ISCSI_CDB_SIZE;
+ }
+ memcpy(hdr->cdb, sc->cmnd, cmd_len);
ctask->imm_count = 0;
if (sc->sc_data_direction == DMA_TO_DEVICE) {
diff --git a/include/scsi/iscsi_proto.h b/include/scsi/iscsi_proto.h
index 5ffec8a..e0593bf 100644
--- a/include/scsi/iscsi_proto.h
+++ b/include/scsi/iscsi_proto.h
@@ -112,6 +112,7 @@ struct iscsi_ahs_hdr {
#define ISCSI_AHSTYPE_CDB 1
#define ISCSI_AHSTYPE_RLENGTH 2
+#define ISCSI_CDB_SIZE 16
/* iSCSI PDU Header */
struct iscsi_cmd {
@@ -125,7 +126,7 @@ struct iscsi_cmd {
__be32 data_length;
__be32 cmdsn;
__be32 exp_statsn;
- uint8_t cdb[16]; /* SCSI Command Block */
+ uint8_t cdb[ISCSI_CDB_SIZE]; /* SCSI Command Block */
/* Additional Data (Command Dependent) */
};
@@ -154,7 +155,8 @@ struct iscsi_ecdb_ahdr {
__be16 ahslength; /* CDB length - 15, including reserved byte */
uint8_t ahstype;
uint8_t reserved;
- uint8_t ecdb[260 - 16]; /* 4-byte aligned extended CDB spillover */
+ /* 4-byte aligned extended CDB spillover */
+ uint8_t ecdb[260 - ISCSI_CDB_SIZE];
};
/* SCSI Response Header */
--
1.5.3.3
-
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