4 * Header file for zfcp qdio interface
6 * Copyright IBM Corporation 2010
15 * struct zfcp_qdio_queue - qdio queue buffer, zfcp index and free count
17 * @first: index of next free buffer in queue
18 * @count: number of free buffers in queue
20 struct zfcp_qdio_queue {
21 struct qdio_buffer *sbal[QDIO_MAX_BUFFERS_PER_Q];
27 * struct zfcp_qdio - basic qdio data structure
28 * @resp_q: response queue
29 * @req_q: request queue
30 * @stat_lock: lock to protect req_q_util and req_q_time
31 * @req_q_lock: lock to serialize access to request queue
32 * @req_q_time: time of last fill level change
33 * @req_q_util: used for accounting
34 * @req_q_full: queue full incidents
35 * @req_q_wq: used to wait for SBAL availability
36 * @adapter: adapter used in conjunction with this qdio structure
39 struct zfcp_qdio_queue resp_q;
40 struct zfcp_qdio_queue req_q;
42 spinlock_t req_q_lock;
43 unsigned long long req_q_time;
46 wait_queue_head_t req_q_wq;
47 struct zfcp_adapter *adapter;
51 * struct zfcp_qdio_req - qdio queue related values for a request
52 * @sbal_number: number of free sbals
53 * @sbal_first: first sbal for this request
54 * @sbal_last: last sbal for this request
55 * @sbal_limit: last possible sbal for this request
56 * @sbale_curr: current sbale at creation of this request
57 * @sbal_response: sbal used in interrupt
58 * @qdio_outb_usage: usage of outbound queue
59 * @qdio_inb_usage: usage of inbound queue
61 struct zfcp_qdio_req {
73 * zfcp_qdio_sbale - return pointer to sbale in qdio queue
74 * @q: queue where to find sbal
75 * @sbal_idx: sbal index in queue
76 * @sbale_idx: sbale index in sbal
78 static inline struct qdio_buffer_element *
79 zfcp_qdio_sbale(struct zfcp_qdio_queue *q, int sbal_idx, int sbale_idx)
81 return &q->sbal[sbal_idx]->element[sbale_idx];
85 * zfcp_qdio_sbale_req - return pointer to sbale on req_q for a request
86 * @qdio: pointer to struct zfcp_qdio
87 * @q_rec: pointer to struct zfcp_qdio_req
88 * Returns: pointer to qdio_buffer_element (sbale) structure
90 static inline struct qdio_buffer_element *
91 zfcp_qdio_sbale_req(struct zfcp_qdio *qdio, struct zfcp_qdio_req *q_req)
93 return zfcp_qdio_sbale(&qdio->req_q, q_req->sbal_last, 0);
97 * zfcp_qdio_sbale_curr - return current sbale on req_q for a request
98 * @qdio: pointer to struct zfcp_qdio
99 * @fsf_req: pointer to struct zfcp_fsf_req
100 * Returns: pointer to qdio_buffer_element (sbale) structure
102 static inline struct qdio_buffer_element *
103 zfcp_qdio_sbale_curr(struct zfcp_qdio *qdio, struct zfcp_qdio_req *q_req)
105 return zfcp_qdio_sbale(&qdio->req_q, q_req->sbal_last,
109 #endif /* ZFCP_QDIO_H */