diff options
| author | Swen Schillig <swen@vnet.ibm.com> | 2011-08-15 14:40:32 +0200 |
|---|---|---|
| committer | James Bottomley <JBottomley@Parallels.com> | 2011-08-27 08:37:03 -0600 |
| commit | 86a9668a8d29ea711613e1cb37efa68e7c4db564 (patch) | |
| tree | 58a39ba842f928bd9629cfb8468322a96fe7459f /drivers/s390/scsi/zfcp_qdio.h | |
| parent | dfe5bb506172307e43287b8962348fb85801c0f4 (diff) | |
[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>
Diffstat (limited to 'drivers/s390/scsi/zfcp_qdio.h')
| -rw-r--r-- | drivers/s390/scsi/zfcp_qdio.h | 66 |
1 files changed, 51 insertions, 15 deletions
diff --git a/drivers/s390/scsi/zfcp_qdio.h b/drivers/s390/scsi/zfcp_qdio.h index 54e22ace012..8ac7f5342d2 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 @@ 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 */ |