[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.c b/drivers/s390/scsi/zfcp_qdio.c
index d9c40ea..df9e69f 100644
--- a/drivers/s390/scsi/zfcp_qdio.c
+++ b/drivers/s390/scsi/zfcp_qdio.c
@@ -15,6 +15,10 @@
#define QBUFF_PER_PAGE (PAGE_SIZE / sizeof(struct qdio_buffer))
+static bool enable_multibuffer;
+module_param_named(datarouter, enable_multibuffer, bool, 0400);
+MODULE_PARM_DESC(datarouter, "Enable hardware data router support");
+
static int zfcp_qdio_buffers_enqueue(struct qdio_buffer **sbal)
{
int pos;
@@ -37,8 +41,11 @@
dev_warn(&adapter->ccw_device->dev, "A QDIO problem occurred\n");
- if (qdio_err & QDIO_ERROR_SLSB_STATE)
+ if (qdio_err & QDIO_ERROR_SLSB_STATE) {
zfcp_qdio_siosl(adapter);
+ zfcp_erp_adapter_shutdown(adapter, 0, id);
+ return;
+ }
zfcp_erp_adapter_reopen(adapter,
ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED |
ZFCP_STATUS_COMMON_ERP_FAILED, id);
@@ -93,9 +100,27 @@
unsigned long parm)
{
struct zfcp_qdio *qdio = (struct zfcp_qdio *) parm;
- int sbal_idx, sbal_no;
+ struct zfcp_adapter *adapter = qdio->adapter;
+ struct qdio_buffer_element *sbale;
+ int sbal_no, sbal_idx;
+ void *pl[ZFCP_QDIO_MAX_SBALS_PER_REQ + 1];
+ u64 req_id;
+ u8 scount;
if (unlikely(qdio_err)) {
+ memset(pl, 0, ZFCP_QDIO_MAX_SBALS_PER_REQ * sizeof(void *));
+ if (zfcp_adapter_multi_buffer_active(adapter)) {
+ sbale = qdio->res_q[idx]->element;
+ req_id = (u64) sbale->addr;
+ scount = sbale->scount + 1; /* incl. signaling SBAL */
+
+ for (sbal_no = 0; sbal_no < scount; sbal_no++) {
+ sbal_idx = (idx + sbal_no) %
+ QDIO_MAX_BUFFERS_PER_Q;
+ pl[sbal_no] = qdio->res_q[sbal_idx];
+ }
+ zfcp_dbf_hba_def_err(adapter, req_id, scount, pl);
+ }
zfcp_qdio_handler_error(qdio, "qdires1", qdio_err);
return;
}
@@ -155,7 +180,7 @@
static struct qdio_buffer_element *
zfcp_qdio_sbale_next(struct zfcp_qdio *qdio, struct zfcp_qdio_req *q_req)
{
- if (q_req->sbale_curr == ZFCP_QDIO_LAST_SBALE_PER_SBAL)
+ if (q_req->sbale_curr == qdio->max_sbale_per_sbal - 1)
return zfcp_qdio_sbal_chain(qdio, q_req);
q_req->sbale_curr++;
return zfcp_qdio_sbale_curr(qdio, q_req);
@@ -167,13 +192,12 @@
* @q_req: pointer to struct zfcp_qdio_req
* @sg: scatter-gather list
* @max_sbals: upper bound for number of SBALs to be used
- * Returns: number of bytes, or error (negativ)
+ * Returns: zero or -EINVAL on error
*/
int zfcp_qdio_sbals_from_sg(struct zfcp_qdio *qdio, struct zfcp_qdio_req *q_req,
struct scatterlist *sg)
{
struct qdio_buffer_element *sbale;
- int bytes = 0;
/* set storage-block type for this request */
sbale = zfcp_qdio_sbale_req(qdio, q_req);
@@ -187,14 +211,10 @@
q_req->sbal_number);
return -EINVAL;
}
-
sbale->addr = sg_virt(sg);
sbale->length = sg->length;
-
- bytes += sg->length;
}
-
- return bytes;
+ return 0;
}
static int zfcp_qdio_sbal_check(struct zfcp_qdio *qdio)
@@ -283,6 +303,8 @@
memcpy(id->adapter_name, dev_name(&id->cdev->dev), 8);
ASCEBC(id->adapter_name, 8);
id->qib_rflags = QIB_RFLAGS_ENABLE_DATA_DIV;
+ if (enable_multibuffer)
+ id->qdr_ac |= QDR_AC_MULTI_BUFFER_ENABLE;
id->no_input_qs = 1;
id->no_output_qs = 1;
id->input_handler = zfcp_qdio_int_resp;
@@ -378,6 +400,17 @@
atomic_set_mask(ZFCP_STATUS_ADAPTER_DATA_DIV_ENABLED,
&qdio->adapter->status);
+ if (ssqd.qdioac2 & CHSC_AC2_MULTI_BUFFER_ENABLED) {
+ atomic_set_mask(ZFCP_STATUS_ADAPTER_MB_ACT, &adapter->status);
+ qdio->max_sbale_per_sbal = QDIO_MAX_ELEMENTS_PER_BUFFER;
+ } else {
+ atomic_clear_mask(ZFCP_STATUS_ADAPTER_MB_ACT, &adapter->status);
+ qdio->max_sbale_per_sbal = QDIO_MAX_ELEMENTS_PER_BUFFER - 1;
+ }
+
+ qdio->max_sbale_per_req =
+ ZFCP_QDIO_MAX_SBALS_PER_REQ * qdio->max_sbale_per_sbal
+ - 2;
if (qdio_activate(cdev))
goto failed_qdio;
@@ -397,6 +430,11 @@
atomic_set(&qdio->req_q_free, QDIO_MAX_BUFFERS_PER_Q);
atomic_set_mask(ZFCP_STATUS_ADAPTER_QDIOUP, &qdio->adapter->status);
+ if (adapter->scsi_host) {
+ adapter->scsi_host->sg_tablesize = qdio->max_sbale_per_req;
+ adapter->scsi_host->max_sectors = qdio->max_sbale_per_req * 8;
+ }
+
return 0;
failed_qdio: