[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>
This commit is contained in:
Swen Schillig
James Bottomley
parent
dfe5bb5061
commit
86a9668a8d
7 changed files with 196 additions and 61 deletions
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@ -163,6 +163,42 @@ void zfcp_dbf_hba_bit_err(char *tag, struct zfcp_fsf_req *req)
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spin_unlock_irqrestore(&dbf->hba_lock, flags);
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}
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/**
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* zfcp_dbf_hba_def_err - trace event for deferred error messages
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* @adapter: pointer to struct zfcp_adapter
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* @req_id: request id which caused the deferred error message
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* @scount: number of sbals incl. the signaling sbal
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* @pl: array of all involved sbals
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*/
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void zfcp_dbf_hba_def_err(struct zfcp_adapter *adapter, u64 req_id, u16 scount,
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void **pl)
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{
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struct zfcp_dbf *dbf = adapter->dbf;
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struct zfcp_dbf_pay *payload = &dbf->pay_buf;
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unsigned long flags;
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u16 length;
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if (!pl)
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return;
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spin_lock_irqsave(&dbf->pay_lock, flags);
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memset(payload, 0, sizeof(*payload));
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memcpy(payload->area, "def_err", 7);
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payload->fsf_req_id = req_id;
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payload->counter = 0;
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length = min((u16)sizeof(struct qdio_buffer),
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(u16)ZFCP_DBF_PAY_MAX_REC);
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while ((char *)pl[payload->counter] && payload->counter < scount) {
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memcpy(payload->data, (char *)pl[payload->counter], length);
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debug_event(dbf->pay, 1, payload, zfcp_dbf_plen(length));
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payload->counter++;
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}
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spin_unlock_irqrestore(&dbf->pay_lock, flags);
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}
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static void zfcp_dbf_set_common(struct zfcp_dbf_rec *rec,
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struct zfcp_adapter *adapter,
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struct zfcp_port *port,
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@ -72,6 +72,7 @@ struct zfcp_reqlist;
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#define ZFCP_STATUS_COMMON_NOESC 0x00200000
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/* adapter status */
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#define ZFCP_STATUS_ADAPTER_MB_ACT 0x00000001
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#define ZFCP_STATUS_ADAPTER_QDIOUP 0x00000002
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#define ZFCP_STATUS_ADAPTER_SIOSL_ISSUED 0x00000004
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#define ZFCP_STATUS_ADAPTER_XCONFIG_OK 0x00000008
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@ -314,4 +315,10 @@ struct zfcp_fsf_req {
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void (*handler)(struct zfcp_fsf_req *);
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};
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static inline
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int zfcp_adapter_multi_buffer_active(struct zfcp_adapter *adapter)
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{
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return atomic_read(&adapter->status) & ZFCP_STATUS_ADAPTER_MB_ACT;
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}
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#endif /* ZFCP_DEF_H */
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@ -53,6 +53,7 @@ extern void zfcp_dbf_hba_fsf_uss(char *, struct zfcp_fsf_req *);
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extern void zfcp_dbf_hba_fsf_res(char *, struct zfcp_fsf_req *);
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extern void zfcp_dbf_hba_bit_err(char *, struct zfcp_fsf_req *);
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extern void zfcp_dbf_hba_berr(struct zfcp_dbf *, struct zfcp_fsf_req *);
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extern void zfcp_dbf_hba_def_err(struct zfcp_adapter *, u64, u16, void **);
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extern void zfcp_dbf_san_req(char *, struct zfcp_fsf_req *, u32);
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extern void zfcp_dbf_san_res(char *, struct zfcp_fsf_req *);
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extern void zfcp_dbf_san_in_els(char *, struct zfcp_fsf_req *);
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@ -936,39 +936,47 @@ static int zfcp_fsf_setup_ct_els_sbals(struct zfcp_fsf_req *req,
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struct scatterlist *sg_resp)
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{
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struct zfcp_adapter *adapter = req->adapter;
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struct zfcp_qdio *qdio = adapter->qdio;
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struct fsf_qtcb *qtcb = req->qtcb;
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u32 feat = adapter->adapter_features;
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int bytes;
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if (!(feat & FSF_FEATURE_ELS_CT_CHAINED_SBALS)) {
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if (!zfcp_qdio_sg_one_sbale(sg_req) ||
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!zfcp_qdio_sg_one_sbale(sg_resp))
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return -EOPNOTSUPP;
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if (zfcp_adapter_multi_buffer_active(adapter)) {
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if (zfcp_qdio_sbals_from_sg(qdio, &req->qdio_req, sg_req))
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return -EIO;
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if (zfcp_qdio_sbals_from_sg(qdio, &req->qdio_req, sg_resp))
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return -EIO;
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zfcp_fsf_setup_ct_els_unchained(adapter->qdio, &req->qdio_req,
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sg_req, sg_resp);
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zfcp_qdio_set_data_div(qdio, &req->qdio_req,
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zfcp_qdio_sbale_count(sg_req));
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zfcp_qdio_set_sbale_last(qdio, &req->qdio_req);
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zfcp_qdio_set_scount(qdio, &req->qdio_req);
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return 0;
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}
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/* use single, unchained SBAL if it can hold the request */
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if (zfcp_qdio_sg_one_sbale(sg_req) && zfcp_qdio_sg_one_sbale(sg_resp)) {
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zfcp_fsf_setup_ct_els_unchained(adapter->qdio, &req->qdio_req,
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zfcp_fsf_setup_ct_els_unchained(qdio, &req->qdio_req,
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sg_req, sg_resp);
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return 0;
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}
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bytes = zfcp_qdio_sbals_from_sg(adapter->qdio, &req->qdio_req, sg_req);
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if (bytes <= 0)
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return -EIO;
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zfcp_qdio_set_sbale_last(adapter->qdio, &req->qdio_req);
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req->qtcb->bottom.support.req_buf_length = bytes;
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zfcp_qdio_skip_to_last_sbale(&req->qdio_req);
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if (!(feat & FSF_FEATURE_ELS_CT_CHAINED_SBALS))
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return -EOPNOTSUPP;
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bytes = zfcp_qdio_sbals_from_sg(adapter->qdio, &req->qdio_req,
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sg_resp);
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req->qtcb->bottom.support.resp_buf_length = bytes;
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if (bytes <= 0)
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if (zfcp_qdio_sbals_from_sg(qdio, &req->qdio_req, sg_req))
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return -EIO;
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zfcp_qdio_set_sbale_last(adapter->qdio, &req->qdio_req);
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qtcb->bottom.support.req_buf_length = zfcp_qdio_real_bytes(sg_req);
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zfcp_qdio_set_sbale_last(qdio, &req->qdio_req);
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zfcp_qdio_skip_to_last_sbale(qdio, &req->qdio_req);
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if (zfcp_qdio_sbals_from_sg(qdio, &req->qdio_req, sg_resp))
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return -EIO;
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qtcb->bottom.support.resp_buf_length = zfcp_qdio_real_bytes(sg_resp);
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zfcp_qdio_set_sbale_last(qdio, &req->qdio_req);
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return 0;
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}
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@ -1119,7 +1127,8 @@ int zfcp_fsf_send_els(struct zfcp_adapter *adapter, u32 d_id,
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req->status |= ZFCP_STATUS_FSFREQ_CLEANUP;
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zfcp_qdio_sbal_limit(qdio, &req->qdio_req, 2);
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if (!zfcp_adapter_multi_buffer_active(adapter))
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zfcp_qdio_sbal_limit(qdio, &req->qdio_req, 2);
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ret = zfcp_fsf_setup_ct_els(req, els->req, els->resp, timeout);
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@ -2162,7 +2171,7 @@ int zfcp_fsf_fcp_cmnd(struct scsi_cmnd *scsi_cmnd)
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struct zfcp_fsf_req *req;
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struct fcp_cmnd *fcp_cmnd;
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u8 sbtype = SBAL_SFLAGS0_TYPE_READ;
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int real_bytes, retval = -EIO, dix_bytes = 0;
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int retval = -EIO;
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struct scsi_device *sdev = scsi_cmnd->device;
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struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(sdev);
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struct zfcp_adapter *adapter = zfcp_sdev->port->adapter;
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@ -2216,18 +2225,22 @@ int zfcp_fsf_fcp_cmnd(struct scsi_cmnd *scsi_cmnd)
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if (scsi_prot_sg_count(scsi_cmnd)) {
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zfcp_qdio_set_data_div(qdio, &req->qdio_req,
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scsi_prot_sg_count(scsi_cmnd));
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dix_bytes = zfcp_qdio_sbals_from_sg(qdio, &req->qdio_req,
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retval = zfcp_qdio_sbals_from_sg(qdio, &req->qdio_req,
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scsi_prot_sglist(scsi_cmnd));
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if (retval)
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goto failed_scsi_cmnd;
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io->prot_data_length = zfcp_qdio_real_bytes(
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scsi_prot_sglist(scsi_cmnd));
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io->prot_data_length = dix_bytes;
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}
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real_bytes = zfcp_qdio_sbals_from_sg(qdio, &req->qdio_req,
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scsi_sglist(scsi_cmnd));
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if (unlikely(real_bytes < 0) || unlikely(dix_bytes < 0))
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retval = zfcp_qdio_sbals_from_sg(qdio, &req->qdio_req,
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scsi_sglist(scsi_cmnd));
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if (unlikely(retval))
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goto failed_scsi_cmnd;
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zfcp_qdio_set_sbale_last(adapter->qdio, &req->qdio_req);
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if (zfcp_adapter_multi_buffer_active(adapter))
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zfcp_qdio_set_scount(qdio, &req->qdio_req);
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retval = zfcp_fsf_req_send(req);
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if (unlikely(retval))
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@ -2329,7 +2342,7 @@ struct zfcp_fsf_req *zfcp_fsf_control_file(struct zfcp_adapter *adapter,
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struct zfcp_qdio *qdio = adapter->qdio;
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struct zfcp_fsf_req *req = NULL;
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struct fsf_qtcb_bottom_support *bottom;
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int retval = -EIO, bytes;
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int retval = -EIO;
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u8 direction;
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if (!(adapter->adapter_features & FSF_FEATURE_CFDC))
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@ -2362,13 +2375,17 @@ struct zfcp_fsf_req *zfcp_fsf_control_file(struct zfcp_adapter *adapter,
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bottom->operation_subtype = FSF_CFDC_OPERATION_SUBTYPE;
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bottom->option = fsf_cfdc->option;
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bytes = zfcp_qdio_sbals_from_sg(qdio, &req->qdio_req, fsf_cfdc->sg);
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retval = zfcp_qdio_sbals_from_sg(qdio, &req->qdio_req, fsf_cfdc->sg);
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if (bytes != ZFCP_CFDC_MAX_SIZE) {
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if (retval ||
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(zfcp_qdio_real_bytes(fsf_cfdc->sg) != ZFCP_CFDC_MAX_SIZE)) {
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zfcp_fsf_req_free(req);
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retval = -EIO;
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goto out;
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}
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zfcp_qdio_set_sbale_last(adapter->qdio, &req->qdio_req);
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zfcp_qdio_set_sbale_last(qdio, &req->qdio_req);
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if (zfcp_adapter_multi_buffer_active(adapter))
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zfcp_qdio_set_scount(qdio, &req->qdio_req);
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zfcp_fsf_start_timer(req, ZFCP_FSF_REQUEST_TIMEOUT);
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retval = zfcp_fsf_req_send(req);
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@ -15,6 +15,10 @@
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#define QBUFF_PER_PAGE (PAGE_SIZE / sizeof(struct qdio_buffer))
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static bool enable_multibuffer;
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module_param_named(datarouter, enable_multibuffer, bool, 0400);
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MODULE_PARM_DESC(datarouter, "Enable hardware data router support");
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static int zfcp_qdio_buffers_enqueue(struct qdio_buffer **sbal)
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{
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int pos;
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@ -37,8 +41,11 @@ static void zfcp_qdio_handler_error(struct zfcp_qdio *qdio, char *id,
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dev_warn(&adapter->ccw_device->dev, "A QDIO problem occurred\n");
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if (qdio_err & QDIO_ERROR_SLSB_STATE)
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if (qdio_err & QDIO_ERROR_SLSB_STATE) {
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zfcp_qdio_siosl(adapter);
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zfcp_erp_adapter_shutdown(adapter, 0, id);
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return;
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}
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zfcp_erp_adapter_reopen(adapter,
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ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED |
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ZFCP_STATUS_COMMON_ERP_FAILED, id);
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@ -93,9 +100,27 @@ static void zfcp_qdio_int_resp(struct ccw_device *cdev, unsigned int qdio_err,
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unsigned long parm)
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{
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struct zfcp_qdio *qdio = (struct zfcp_qdio *) parm;
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int sbal_idx, sbal_no;
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struct zfcp_adapter *adapter = qdio->adapter;
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struct qdio_buffer_element *sbale;
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int sbal_no, sbal_idx;
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void *pl[ZFCP_QDIO_MAX_SBALS_PER_REQ + 1];
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u64 req_id;
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u8 scount;
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if (unlikely(qdio_err)) {
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memset(pl, 0, ZFCP_QDIO_MAX_SBALS_PER_REQ * sizeof(void *));
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if (zfcp_adapter_multi_buffer_active(adapter)) {
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sbale = qdio->res_q[idx]->element;
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req_id = (u64) sbale->addr;
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scount = sbale->scount + 1; /* incl. signaling SBAL */
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for (sbal_no = 0; sbal_no < scount; sbal_no++) {
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sbal_idx = (idx + sbal_no) %
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QDIO_MAX_BUFFERS_PER_Q;
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pl[sbal_no] = qdio->res_q[sbal_idx];
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}
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zfcp_dbf_hba_def_err(adapter, req_id, scount, pl);
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}
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zfcp_qdio_handler_error(qdio, "qdires1", qdio_err);
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return;
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}
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@ -155,7 +180,7 @@ zfcp_qdio_sbal_chain(struct zfcp_qdio *qdio, struct zfcp_qdio_req *q_req)
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static struct qdio_buffer_element *
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zfcp_qdio_sbale_next(struct zfcp_qdio *qdio, struct zfcp_qdio_req *q_req)
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{
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if (q_req->sbale_curr == ZFCP_QDIO_LAST_SBALE_PER_SBAL)
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if (q_req->sbale_curr == qdio->max_sbale_per_sbal - 1)
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return zfcp_qdio_sbal_chain(qdio, q_req);
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q_req->sbale_curr++;
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return zfcp_qdio_sbale_curr(qdio, q_req);
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@ -167,13 +192,12 @@ zfcp_qdio_sbale_next(struct zfcp_qdio *qdio, struct zfcp_qdio_req *q_req)
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* @q_req: pointer to struct zfcp_qdio_req
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* @sg: scatter-gather list
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* @max_sbals: upper bound for number of SBALs to be used
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* Returns: number of bytes, or error (negativ)
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* Returns: zero or -EINVAL on error
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*/
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int zfcp_qdio_sbals_from_sg(struct zfcp_qdio *qdio, struct zfcp_qdio_req *q_req,
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struct scatterlist *sg)
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{
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struct qdio_buffer_element *sbale;
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int bytes = 0;
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/* set storage-block type for this request */
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sbale = zfcp_qdio_sbale_req(qdio, q_req);
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@ -187,14 +211,10 @@ int zfcp_qdio_sbals_from_sg(struct zfcp_qdio *qdio, struct zfcp_qdio_req *q_req,
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q_req->sbal_number);
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return -EINVAL;
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}
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sbale->addr = sg_virt(sg);
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sbale->length = sg->length;
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bytes += sg->length;
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}
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return bytes;
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return 0;
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}
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static int zfcp_qdio_sbal_check(struct zfcp_qdio *qdio)
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@ -283,6 +303,8 @@ static void zfcp_qdio_setup_init_data(struct qdio_initialize *id,
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memcpy(id->adapter_name, dev_name(&id->cdev->dev), 8);
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ASCEBC(id->adapter_name, 8);
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id->qib_rflags = QIB_RFLAGS_ENABLE_DATA_DIV;
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if (enable_multibuffer)
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id->qdr_ac |= QDR_AC_MULTI_BUFFER_ENABLE;
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id->no_input_qs = 1;
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id->no_output_qs = 1;
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id->input_handler = zfcp_qdio_int_resp;
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@ -378,6 +400,17 @@ int zfcp_qdio_open(struct zfcp_qdio *qdio)
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atomic_set_mask(ZFCP_STATUS_ADAPTER_DATA_DIV_ENABLED,
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&qdio->adapter->status);
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if (ssqd.qdioac2 & CHSC_AC2_MULTI_BUFFER_ENABLED) {
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atomic_set_mask(ZFCP_STATUS_ADAPTER_MB_ACT, &adapter->status);
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qdio->max_sbale_per_sbal = QDIO_MAX_ELEMENTS_PER_BUFFER;
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} else {
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atomic_clear_mask(ZFCP_STATUS_ADAPTER_MB_ACT, &adapter->status);
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qdio->max_sbale_per_sbal = QDIO_MAX_ELEMENTS_PER_BUFFER - 1;
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}
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qdio->max_sbale_per_req =
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ZFCP_QDIO_MAX_SBALS_PER_REQ * qdio->max_sbale_per_sbal
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- 2;
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if (qdio_activate(cdev))
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goto failed_qdio;
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@ -397,6 +430,11 @@ int zfcp_qdio_open(struct zfcp_qdio *qdio)
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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:
|
||||
|
|
|
|||
|
|
@ -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 @@ struct zfcp_qdio {
|
|||
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 @@ void zfcp_qdio_fill_next(struct zfcp_qdio *qdio, struct zfcp_qdio_req *q_req,
|
|||
{
|
||||
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 @@ int zfcp_qdio_sg_one_sbale(struct scatterlist *sg)
|
|||
* @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 @@ void zfcp_qdio_set_data_div(struct zfcp_qdio *qdio,
|
|||
{
|
||||
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 */
|
||||
|
|
|
|||
|
|
@ -306,8 +306,8 @@ static struct scsi_host_template zfcp_scsi_host_template = {
|
|||
.proc_name = "zfcp",
|
||||
.can_queue = 4096,
|
||||
.this_id = -1,
|
||||
.sg_tablesize = ZFCP_QDIO_MAX_SBALES_PER_REQ,
|
||||
.max_sectors = (ZFCP_QDIO_MAX_SBALES_PER_REQ * 8),
|
||||
.sg_tablesize = 1, /* adjusted later */
|
||||
.max_sectors = 8, /* adjusted later */
|
||||
.dma_boundary = ZFCP_QDIO_SBALE_LEN - 1,
|
||||
.cmd_per_lun = 1,
|
||||
.use_clustering = 1,
|
||||
|
|
@ -665,9 +665,9 @@ void zfcp_scsi_set_prot(struct zfcp_adapter *adapter)
|
|||
adapter->adapter_features & FSF_FEATURE_DIX_PROT_TCPIP) {
|
||||
mask |= SHOST_DIX_TYPE1_PROTECTION;
|
||||
scsi_host_set_guard(shost, SHOST_DIX_GUARD_IP);
|
||||
shost->sg_prot_tablesize = ZFCP_QDIO_MAX_SBALES_PER_REQ / 2;
|
||||
shost->sg_tablesize = ZFCP_QDIO_MAX_SBALES_PER_REQ / 2;
|
||||
shost->max_sectors = ZFCP_QDIO_MAX_SBALES_PER_REQ * 8 / 2;
|
||||
shost->sg_prot_tablesize = adapter->qdio->max_sbale_per_req / 2;
|
||||
shost->sg_tablesize = adapter->qdio->max_sbale_per_req / 2;
|
||||
shost->max_sectors = shost->sg_tablesize * 8;
|
||||
}
|
||||
|
||||
scsi_host_set_prot(shost, mask);
|
||||
|
|
|
|||
Loading…
Reference in a new issue