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List: linux-s390
Subject: [patch 04/10] zfcp: Cleanup function parameters for sbal value.
From: Christof Schmitt <christof.schmitt () de ! ibm ! com>
Date: 2010-07-16 13:37:37
Message-ID: 20100716134300.292446000 () de ! ibm ! com
[Download RAW message or body]
From: Swen Schillig <swen@vnet.ibm.com>
A lot of functions require the amount of SBALs as one of their
parameter which is most times invariable. Therefore remove this
parameter and set the SBAL value explicitly if a non standard value is
required. In addition the warning message "oversized data" is
replaced with a BUG_ON() statement assuring the limits defined and
requested by zfcp.
Signed-off-by: Swen Schillig <swen@vnet.ibm.com>
Signed-off-by: Christof Schmitt <christof.schmitt@de.ibm.com>
---
drivers/s390/scsi/zfcp_ext.h | 2 +-
drivers/s390/scsi/zfcp_fsf.c | 40 ++++++++++++++--------------------------
drivers/s390/scsi/zfcp_fsf.h | 8 --------
drivers/s390/scsi/zfcp_qdio.c | 15 ++-------------
drivers/s390/scsi/zfcp_qdio.h | 28 ++++++++++++++++++++++++++++
drivers/s390/scsi/zfcp_scsi.c | 4 ++--
6 files changed, 47 insertions(+), 50 deletions(-)
--- a/drivers/s390/scsi/zfcp_ext.h
+++ b/drivers/s390/scsi/zfcp_ext.h
@@ -146,7 +146,7 @@ extern void zfcp_qdio_destroy(struct zfc
extern int zfcp_qdio_sbal_get(struct zfcp_qdio *);
extern int zfcp_qdio_send(struct zfcp_qdio *, struct zfcp_qdio_req *);
extern int zfcp_qdio_sbals_from_sg(struct zfcp_qdio *, struct zfcp_qdio_req *,
- struct scatterlist *, int);
+ struct scatterlist *);
extern int zfcp_qdio_open(struct zfcp_qdio *);
extern void zfcp_qdio_close(struct zfcp_qdio *);
--- a/drivers/s390/scsi/zfcp_fsf.c
+++ b/drivers/s390/scsi/zfcp_fsf.c
@@ -959,8 +959,7 @@ static void zfcp_fsf_setup_ct_els_unchai
static int zfcp_fsf_setup_ct_els_sbals(struct zfcp_fsf_req *req,
struct scatterlist *sg_req,
- struct scatterlist *sg_resp,
- int max_sbals)
+ struct scatterlist *sg_resp)
{
struct zfcp_adapter *adapter = req->adapter;
u32 feat = adapter->adapter_features;
@@ -983,15 +982,14 @@ static int zfcp_fsf_setup_ct_els_sbals(s
return 0;
}
- bytes = zfcp_qdio_sbals_from_sg(adapter->qdio, &req->qdio_req,
- sg_req, max_sbals);
+ bytes = zfcp_qdio_sbals_from_sg(adapter->qdio, &req->qdio_req, sg_req);
if (bytes <= 0)
return -EIO;
req->qtcb->bottom.support.req_buf_length = bytes;
zfcp_qdio_skip_to_last_sbale(&req->qdio_req);
bytes = zfcp_qdio_sbals_from_sg(adapter->qdio, &req->qdio_req,
- sg_resp, max_sbals);
+ sg_resp);
req->qtcb->bottom.support.resp_buf_length = bytes;
if (bytes <= 0)
return -EIO;
@@ -1002,11 +1000,11 @@ static int zfcp_fsf_setup_ct_els_sbals(s
static int zfcp_fsf_setup_ct_els(struct zfcp_fsf_req *req,
struct scatterlist *sg_req,
struct scatterlist *sg_resp,
- int max_sbals, unsigned int timeout)
+ unsigned int timeout)
{
int ret;
- ret = zfcp_fsf_setup_ct_els_sbals(req, sg_req, sg_resp, max_sbals);
+ ret = zfcp_fsf_setup_ct_els_sbals(req, sg_req, sg_resp);
if (ret)
return ret;
@@ -1046,8 +1044,7 @@ int zfcp_fsf_send_ct(struct zfcp_fc_wka_
}
req->status |= ZFCP_STATUS_FSFREQ_CLEANUP;
- ret = zfcp_fsf_setup_ct_els(req, ct->req, ct->resp,
- ZFCP_FSF_MAX_SBALS_PER_REQ, timeout);
+ ret = zfcp_fsf_setup_ct_els(req, ct->req, ct->resp, timeout);
if (ret)
goto failed_send;
@@ -1143,7 +1140,10 @@ int zfcp_fsf_send_els(struct zfcp_adapte
}
req->status |= ZFCP_STATUS_FSFREQ_CLEANUP;
- ret = zfcp_fsf_setup_ct_els(req, els->req, els->resp, 2, timeout);
+
+ zfcp_qdio_sbal_limit(qdio, &req->qdio_req, 2);
+
+ ret = zfcp_fsf_setup_ct_els(req, els->req, els->resp, timeout);
if (ret)
goto failed_send;
@@ -2259,20 +2259,9 @@ int zfcp_fsf_send_fcp_command_task(struc
zfcp_fc_scsi_to_fcp(fcp_cmnd, scsi_cmnd);
real_bytes = zfcp_qdio_sbals_from_sg(qdio, &req->qdio_req,
- scsi_sglist(scsi_cmnd),
- ZFCP_FSF_MAX_SBALS_PER_REQ);
- if (unlikely(real_bytes < 0)) {
- if (req->qdio_req.sbal_number >= ZFCP_FSF_MAX_SBALS_PER_REQ) {
- dev_err(&adapter->ccw_device->dev,
- "Oversize data package, unit 0x%016Lx "
- "on port 0x%016Lx closed\n",
- (unsigned long long)unit->fcp_lun,
- (unsigned long long)unit->port->wwpn);
- zfcp_erp_unit_shutdown(unit, 0, "fssfct1", req);
- retval = -EINVAL;
- }
+ scsi_sglist(scsi_cmnd));
+ if (unlikely(real_bytes < 0))
goto failed_scsi_cmnd;
- }
retval = zfcp_fsf_req_send(req);
if (unlikely(retval))
@@ -2391,9 +2380,8 @@ struct zfcp_fsf_req *zfcp_fsf_control_fi
bottom->operation_subtype = FSF_CFDC_OPERATION_SUBTYPE;
bottom->option = fsf_cfdc->option;
- bytes = zfcp_qdio_sbals_from_sg(qdio, &req->qdio_req,
- fsf_cfdc->sg,
- ZFCP_FSF_MAX_SBALS_PER_REQ);
+ bytes = zfcp_qdio_sbals_from_sg(qdio, &req->qdio_req, fsf_cfdc->sg);
+
if (bytes != ZFCP_CFDC_MAX_SIZE) {
zfcp_fsf_req_free(req);
goto out;
--- a/drivers/s390/scsi/zfcp_fsf.h
+++ b/drivers/s390/scsi/zfcp_fsf.h
@@ -151,14 +151,6 @@
/* fc service class */
#define FSF_CLASS_3 0x00000003
-/* SBAL chaining */
-#define ZFCP_FSF_MAX_SBALS_PER_REQ 36
-
-/* max. number of (data buffer) SBALEs in largest SBAL chain
- * request ID + QTCB in SBALE 0 + 1 of first SBAL in chain */
-#define ZFCP_FSF_MAX_SBALES_PER_REQ \
- (ZFCP_FSF_MAX_SBALS_PER_REQ * ZFCP_QDIO_MAX_SBALES_PER_SBAL - 2)
-
/* logging space behind QTCB */
#define FSF_QTCB_LOG_SIZE 1024
--- a/drivers/s390/scsi/zfcp_qdio.c
+++ b/drivers/s390/scsi/zfcp_qdio.c
@@ -141,15 +141,6 @@ static void zfcp_qdio_int_resp(struct cc
zfcp_qdio_resp_put_back(qdio, count);
}
-static void zfcp_qdio_sbal_limit(struct zfcp_qdio *qdio,
- struct zfcp_qdio_req *q_req, int max_sbals)
-{
- int count = atomic_read(&qdio->req_q.count);
- count = min(count, max_sbals);
- q_req->sbal_limit = (q_req->sbal_first + count - 1)
- % QDIO_MAX_BUFFERS_PER_Q;
-}
-
static struct qdio_buffer_element *
zfcp_qdio_sbal_chain(struct zfcp_qdio *qdio, struct zfcp_qdio_req *q_req)
{
@@ -173,6 +164,7 @@ zfcp_qdio_sbal_chain(struct zfcp_qdio *q
/* keep this requests number of SBALs up-to-date */
q_req->sbal_number++;
+ BUG_ON(q_req->sbal_number > ZFCP_QDIO_MAX_SBALS_PER_REQ);
/* start at first SBALE of new SBAL */
q_req->sbale_curr = 0;
@@ -213,14 +205,11 @@ static void zfcp_qdio_undo_sbals(struct
* Returns: number of bytes, or error (negativ)
*/
int zfcp_qdio_sbals_from_sg(struct zfcp_qdio *qdio, struct zfcp_qdio_req *q_req,
- struct scatterlist *sg, int max_sbals)
+ struct scatterlist *sg)
{
struct qdio_buffer_element *sbale;
int bytes = 0;
- /* figure out last allowed SBAL */
- zfcp_qdio_sbal_limit(qdio, q_req, max_sbals);
-
/* set storage-block type for this request */
sbale = zfcp_qdio_sbale_req(qdio, q_req);
sbale->flags |= q_req->sbtype;
--- a/drivers/s390/scsi/zfcp_qdio.h
+++ b/drivers/s390/scsi/zfcp_qdio.h
@@ -19,6 +19,14 @@
/* index of last SBALE (with respect to DMQ bug workaround) */
#define ZFCP_QDIO_LAST_SBALE_PER_SBAL (ZFCP_QDIO_MAX_SBALES_PER_SBAL - 1)
+/* Max SBALS for chaining */
+#define ZFCP_QDIO_MAX_SBALS_PER_REQ 36
+
+/* max. number of (data buffer) SBALEs in largest SBAL chain
+ * request ID + QTCB in SBALE 0 + 1 of first SBAL in chain */
+#define ZFCP_QDIO_MAX_SBALES_PER_REQ \
+ (ZFCP_QDIO_MAX_SBALS_PER_REQ * ZFCP_QDIO_MAX_SBALES_PER_SBAL - 2)
+
/**
* struct zfcp_qdio_queue - qdio queue buffer, zfcp index and free count
* @sbal: qdio buffers
@@ -134,10 +142,14 @@ void zfcp_qdio_req_init(struct zfcp_qdio
unsigned long req_id, u32 sbtype, void *data, u32 len)
{
struct qdio_buffer_element *sbale;
+ int count = min(atomic_read(&qdio->req_q.count),
+ ZFCP_QDIO_MAX_SBALS_PER_REQ);
q_req->sbal_first = q_req->sbal_last = qdio->req_q.first;
q_req->sbal_number = 1;
q_req->sbtype = sbtype;
+ q_req->sbal_limit = (q_req->sbal_first + count - 1)
+ % QDIO_MAX_BUFFERS_PER_Q;
sbale = zfcp_qdio_sbale_req(qdio, q_req);
sbale->addr = (void *) req_id;
@@ -210,4 +222,20 @@ void zfcp_qdio_skip_to_last_sbale(struct
q_req->sbale_curr = ZFCP_QDIO_LAST_SBALE_PER_SBAL;
}
+/**
+ * zfcp_qdio_sbal_limit - set the sbal limit for a request in q_req
+ * @qdio: pointer to struct zfcp_qdio
+ * @q_req: The current zfcp_qdio_req
+ * @max_sbals: maximum number of SBALs allowed
+ */
+static inline
+void zfcp_qdio_sbal_limit(struct zfcp_qdio *qdio,
+ struct zfcp_qdio_req *q_req, int max_sbals)
+{
+ int count = min(atomic_read(&qdio->req_q.count), max_sbals);
+
+ q_req->sbal_limit = (q_req->sbal_first + count - 1) %
+ QDIO_MAX_BUFFERS_PER_Q;
+}
+
#endif /* ZFCP_QDIO_H */
--- a/drivers/s390/scsi/zfcp_scsi.c
+++ b/drivers/s390/scsi/zfcp_scsi.c
@@ -701,11 +701,11 @@ struct zfcp_data zfcp_data = {
.eh_host_reset_handler = zfcp_scsi_eh_host_reset_handler,
.can_queue = 4096,
.this_id = -1,
- .sg_tablesize = ZFCP_FSF_MAX_SBALES_PER_REQ,
+ .sg_tablesize = ZFCP_QDIO_MAX_SBALES_PER_REQ,
.cmd_per_lun = 1,
.use_clustering = 1,
.sdev_attrs = zfcp_sysfs_sdev_attrs,
- .max_sectors = (ZFCP_FSF_MAX_SBALES_PER_REQ * 8),
+ .max_sectors = (ZFCP_QDIO_MAX_SBALES_PER_REQ * 8),
.dma_boundary = ZFCP_QDIO_SBALE_LEN - 1,
.shost_attrs = zfcp_sysfs_shost_attrs,
},
--
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