These changes are the raw update to linux-4.4.6-rt14. Kernel sources

[kvmfornfv.git] / kernel / drivers / scsi / snic / snic_io.h

diff --git a/kernel/drivers/scsi/snic/snic_io.h b/kernel/drivers/scsi/snic/snic_io.h
new file mode 100644 (file)
index 0000000..093d652
--- /dev/null
+++ b/kernel/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 */