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authorSagi Grimberg <sagig@mellanox.com>2014-03-05 19:43:49 +0200
committerRoland Dreier <roland@purestorage.com>2014-03-17 22:33:58 -0700
commit55e51eda4820ec5a1c1fc8693a51029f74eac2b9 (patch)
tree77198a5b21bff21aecc44f625b620efd2342d2f9 /drivers/scsi/libiscsi.c
parent177e31bd5a40999028f6694623ceea1bec5abff6 (diff)
downloadlinux-55e51eda4820ec5a1c1fc8693a51029f74eac2b9.tar.bz2
SCSI/libiscsi: Add check_protection callback for transports
iSCSI needs to be at least aware that a task involves protection information. In case it does, after the transaction completed libiscsi will ask the transport to check the protection status of the transaction. Unlike transport errors, DIF errors should not prevent successful completion of the transaction from the transport point of view, but should be escelated to scsi mid-layer when constructing the scsi result and sense data. check_protection routine will return the ascq corresponding to the DIF error that occured (or 0 if no error happened). return ascq: - 0x1: GUARD_CHECK_FAILED - 0x2: APPTAG_CHECK_FAILED - 0x3: REFTAG_CHECK_FAILED Signed-off-by: Sagi Grimberg <sagig@mellanox.com> Signed-off-by: Alex Tabachnik <alext@mellanox.com> Signed-off-by: Roland Dreier <roland@purestorage.com>
Diffstat (limited to 'drivers/scsi/libiscsi.c')
-rw-r--r--drivers/scsi/libiscsi.c32
1 files changed, 32 insertions, 0 deletions
diff --git a/drivers/scsi/libiscsi.c b/drivers/scsi/libiscsi.c
index 40462415291e..3c11acf67849 100644
--- a/drivers/scsi/libiscsi.c
+++ b/drivers/scsi/libiscsi.c
@@ -395,6 +395,10 @@ static int iscsi_prep_scsi_cmd_pdu(struct iscsi_task *task)
if (rc)
return rc;
}
+
+ if (scsi_get_prot_op(sc) != SCSI_PROT_NORMAL)
+ task->protected = true;
+
if (sc->sc_data_direction == DMA_TO_DEVICE) {
unsigned out_len = scsi_out(sc)->length;
struct iscsi_r2t_info *r2t = &task->unsol_r2t;
@@ -823,6 +827,33 @@ static void iscsi_scsi_cmd_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
sc->result = (DID_OK << 16) | rhdr->cmd_status;
+ if (task->protected) {
+ sector_t sector;
+ u8 ascq;
+
+ /**
+ * Transports that didn't implement check_protection
+ * callback but still published T10-PI support to scsi-mid
+ * deserve this BUG_ON.
+ **/
+ BUG_ON(!session->tt->check_protection);
+
+ ascq = session->tt->check_protection(task, &sector);
+ if (ascq) {
+ sc->result = DRIVER_SENSE << 24 |
+ SAM_STAT_CHECK_CONDITION;
+ scsi_build_sense_buffer(1, sc->sense_buffer,
+ ILLEGAL_REQUEST, 0x10, ascq);
+ sc->sense_buffer[7] = 0xc; /* Additional sense length */
+ sc->sense_buffer[8] = 0; /* Information desc type */
+ sc->sense_buffer[9] = 0xa; /* Additional desc length */
+ sc->sense_buffer[10] = 0x80; /* Validity bit */
+
+ put_unaligned_be64(sector, &sc->sense_buffer[12]);
+ goto out;
+ }
+ }
+
if (rhdr->response != ISCSI_STATUS_CMD_COMPLETED) {
sc->result = DID_ERROR << 16;
goto out;
@@ -1567,6 +1598,7 @@ static inline struct iscsi_task *iscsi_alloc_task(struct iscsi_conn *conn,
task->have_checked_conn = false;
task->last_timeout = jiffies;
task->last_xfer = jiffies;
+ task->protected = false;
INIT_LIST_HEAD(&task->running);
return task;
}