From 01b047599ade30051bf6c14fbe64181d1fec3dfa Mon Sep 17 00:00:00 2001 From: Swen Schillig Date: Fri, 16 Jul 2010 15:37:37 +0200 Subject: [SCSI] zfcp: Cleanup function parameters for sbal value. 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 Signed-off-by: Christof Schmitt Signed-off-by: James Bottomley --- 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(-) (limited to 'drivers/s390') diff --git a/drivers/s390/scsi/zfcp_ext.h b/drivers/s390/scsi/zfcp_ext.h index 6abe2909e75b..3aab0f5544d4 100644 --- a/drivers/s390/scsi/zfcp_ext.h +++ b/drivers/s390/scsi/zfcp_ext.h @@ -146,7 +146,7 @@ extern void zfcp_qdio_destroy(struct zfcp_qdio *); 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 *); diff --git a/drivers/s390/scsi/zfcp_fsf.c b/drivers/s390/scsi/zfcp_fsf.c index ee0c1df8a6d2..5f502c9cb067 100644 --- 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_unchained(struct zfcp_qdio *qdio, 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(struct zfcp_fsf_req *req, 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(struct zfcp_fsf_req *req, 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_port *wka_port, } 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_adapter *adapter, u32 d_id, } 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(struct zfcp_unit *unit, 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_file(struct zfcp_adapter *adapter, 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; diff --git a/drivers/s390/scsi/zfcp_fsf.h b/drivers/s390/scsi/zfcp_fsf.h index ca45e32d6b6f..ca110e386761 100644 --- 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 diff --git a/drivers/s390/scsi/zfcp_qdio.c b/drivers/s390/scsi/zfcp_qdio.c index 6fa5e0453176..7ab1ac16a11f 100644 --- 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 ccw_device *cdev, unsigned int qdio_err, 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 *qdio, struct zfcp_qdio_req *q_req) /* 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 zfcp_qdio *qdio, * 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; diff --git a/drivers/s390/scsi/zfcp_qdio.h b/drivers/s390/scsi/zfcp_qdio.h index 138fba577b48..8bb00545f19c 100644 --- 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 *qdio, struct zfcp_qdio_req *q_req, 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 zfcp_qdio_req *q_req) 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 */ diff --git a/drivers/s390/scsi/zfcp_scsi.c b/drivers/s390/scsi/zfcp_scsi.c index 9d117ee7159a..eb471a1723cd 100644 --- 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, }, -- cgit v1.2.3