[SCSI] zfcp: support for hardware data router
FICON Express8S supports hardware data router, which requires an
adapted qdio request format.
This part 2/2 exploits the functionality in zfcp.
Signed-off-by: Swen Schillig <swen@vnet.ibm.com>
Signed-off-by: Steffen Maier <maier@linux.vnet.ibm.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>
diff --git a/drivers/s390/scsi/zfcp_qdio.h b/drivers/s390/scsi/zfcp_qdio.h
index 54e22ac..8ac7f53 100644
--- a/drivers/s390/scsi/zfcp_qdio.h
+++ b/drivers/s390/scsi/zfcp_qdio.h
@@ -13,20 +13,9 @@
#define ZFCP_QDIO_SBALE_LEN PAGE_SIZE
-/* DMQ bug workaround: don't use last SBALE */
-#define ZFCP_QDIO_MAX_SBALES_PER_SBAL (QDIO_MAX_ELEMENTS_PER_BUFFER - 1)
-
-/* 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 - basic qdio data structure
* @res_q: response queue
@@ -53,6 +42,8 @@
atomic_t req_q_full;
wait_queue_head_t req_q_wq;
struct zfcp_adapter *adapter;
+ u16 max_sbale_per_sbal;
+ u16 max_sbale_per_req;
};
/**
@@ -155,7 +146,7 @@
{
struct qdio_buffer_element *sbale;
- BUG_ON(q_req->sbale_curr == ZFCP_QDIO_LAST_SBALE_PER_SBAL);
+ BUG_ON(q_req->sbale_curr == qdio->max_sbale_per_sbal - 1);
q_req->sbale_curr++;
sbale = zfcp_qdio_sbale_curr(qdio, q_req);
sbale->addr = data;
@@ -195,9 +186,10 @@
* @q_req: The current zfcp_qdio_req
*/
static inline
-void zfcp_qdio_skip_to_last_sbale(struct zfcp_qdio_req *q_req)
+void zfcp_qdio_skip_to_last_sbale(struct zfcp_qdio *qdio,
+ struct zfcp_qdio_req *q_req)
{
- q_req->sbale_curr = ZFCP_QDIO_LAST_SBALE_PER_SBAL;
+ q_req->sbale_curr = qdio->max_sbale_per_sbal - 1;
}
/**
@@ -228,8 +220,52 @@
{
struct qdio_buffer_element *sbale;
- sbale = &qdio->req_q[q_req->sbal_first]->element[0];
+ sbale = qdio->req_q[q_req->sbal_first]->element;
sbale->length = count;
}
+/**
+ * zfcp_qdio_sbale_count - count sbale used
+ * @sg: pointer to struct scatterlist
+ */
+static inline
+unsigned int zfcp_qdio_sbale_count(struct scatterlist *sg)
+{
+ unsigned int count = 0;
+
+ for (; sg; sg = sg_next(sg))
+ count++;
+
+ return count;
+}
+
+/**
+ * zfcp_qdio_real_bytes - count bytes used
+ * @sg: pointer to struct scatterlist
+ */
+static inline
+unsigned int zfcp_qdio_real_bytes(struct scatterlist *sg)
+{
+ unsigned int real_bytes = 0;
+
+ for (; sg; sg = sg_next(sg))
+ real_bytes += sg->length;
+
+ return real_bytes;
+}
+
+/**
+ * zfcp_qdio_set_scount - set SBAL count value
+ * @qdio: pointer to struct zfcp_qdio
+ * @q_req: The current zfcp_qdio_req
+ */
+static inline
+void zfcp_qdio_set_scount(struct zfcp_qdio *qdio, struct zfcp_qdio_req *q_req)
+{
+ struct qdio_buffer_element *sbale;
+
+ sbale = qdio->req_q[q_req->sbal_first]->element;
+ sbale->scount = q_req->sbal_number - 1;
+}
+
#endif /* ZFCP_QDIO_H */