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Diffstat (limited to 'drivers/scsi/snic/snic_io.h')
-rw-r--r--drivers/scsi/snic/snic_io.h118
1 files changed, 118 insertions, 0 deletions
diff --git a/drivers/scsi/snic/snic_io.h b/drivers/scsi/snic/snic_io.h
new file mode 100644
index 000000000..093d6524c
--- /dev/null
+++ b/drivers/scsi/snic/snic_io.h
@@ -0,0 +1,118 @@
+/*
+ * Copyright 2014 Cisco Systems, Inc. All rights reserved.
+ *
+ * This program is free software; you may redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+#ifndef _SNIC_IO_H
+#define _SNIC_IO_H
+
+#define SNIC_DFLT_SG_DESC_CNT 32 /* Default descriptors for sgl */
+#define SNIC_MAX_SG_DESC_CNT 60 /* Max descriptor for sgl */
+#define SNIC_SG_DESC_ALIGN 16 /* Descriptor address alignment */
+
+/* SG descriptor for snic */
+struct snic_sg_desc {
+ __le64 addr;
+ __le32 len;
+ u32 _resvd;
+};
+
+struct snic_dflt_sgl {
+ struct snic_sg_desc sg_desc[SNIC_DFLT_SG_DESC_CNT];
+};
+
+struct snic_max_sgl {
+ struct snic_sg_desc sg_desc[SNIC_MAX_SG_DESC_CNT];
+};
+
+enum snic_req_cache_type {
+ SNIC_REQ_CACHE_DFLT_SGL = 0, /* cache with default size sgl */
+ SNIC_REQ_CACHE_MAX_SGL, /* cache with max size sgl */
+ SNIC_REQ_TM_CACHE, /* cache for task mgmt reqs contains
+ snic_host_req objects only*/
+ SNIC_REQ_MAX_CACHES /* number of sgl caches */
+};
+
+/* Per IO internal state */
+struct snic_internal_io_state {
+ char *rqi;
+ u64 flags;
+ u32 state;
+ u32 abts_status; /* Abort completion status */
+ u32 lr_status; /* device reset completion status */
+};
+
+/* IO state machine */
+enum snic_ioreq_state {
+ SNIC_IOREQ_NOT_INITED = 0,
+ SNIC_IOREQ_PENDING,
+ SNIC_IOREQ_ABTS_PENDING,
+ SNIC_IOREQ_ABTS_COMPLETE,
+ SNIC_IOREQ_LR_PENDING,
+ SNIC_IOREQ_LR_COMPLETE,
+ SNIC_IOREQ_COMPLETE,
+};
+
+struct snic;
+struct snic_host_req;
+
+/*
+ * snic_req_info : Contains info about IO, one per scsi command.
+ * Notes: Make sure that the structure is aligned to 16 B
+ * this helps in easy access to snic_req_info from snic_host_req
+ */
+struct snic_req_info {
+ struct list_head list;
+ struct snic_host_req *req;
+ u64 start_time; /* start time in jiffies */
+ u16 rq_pool_type; /* noticion of request pool type */
+ u16 req_len; /* buf len passing to fw (req + sgl)*/
+ u32 tgt_id;
+
+ u32 tm_tag;
+ u8 io_cmpl:1; /* sets to 1 when fw completes IO */
+ u8 resvd[3];
+ struct scsi_cmnd *sc; /* Associated scsi cmd */
+ struct snic *snic; /* Associated snic */
+ ulong sge_va; /* Pointer to Resp Buffer */
+ u64 snsbuf_va;
+
+ struct snic_host_req *abort_req;
+ struct completion *abts_done;
+
+ struct snic_host_req *dr_req;
+ struct completion *dr_done;
+};
+
+
+#define rqi_to_req(rqi) \
+ ((struct snic_host_req *) (((struct snic_req_info *)rqi)->req))
+
+#define req_to_rqi(req) \
+ ((struct snic_req_info *) (((struct snic_host_req *)req)->hdr.init_ctx))
+
+#define req_to_sgl(req) \
+ ((struct snic_sg_desc *) (((struct snic_host_req *)req)+1))
+
+struct snic_req_info *
+snic_req_init(struct snic *, int sg_cnt);
+void snic_req_free(struct snic *, struct snic_req_info *);
+void snic_calc_io_process_time(struct snic *, struct snic_req_info *);
+void snic_pci_unmap_rsp_buf(struct snic *, struct snic_req_info *);
+struct snic_host_req *
+snic_abort_req_init(struct snic *, struct snic_req_info *);
+struct snic_host_req *
+snic_dr_req_init(struct snic *, struct snic_req_info *);
+#endif /* _SNIC_IO_H */