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

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

diff --git a/kernel/drivers/scsi/snic/cq_desc.h b/kernel/drivers/scsi/snic/cq_desc.h
new file mode 100644 (file)
index 0000000..a529056
--- /dev/null
+++ b/kernel/drivers/scsi/snic/cq_desc.h
@@ -0,0 +1,77 @@
+/*
+ * 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 _CQ_DESC_H_
+#define _CQ_DESC_H_
+
+/*
+ * Completion queue descriptor types
+ */
+enum cq_desc_types {
+       CQ_DESC_TYPE_WQ_ENET = 0,
+       CQ_DESC_TYPE_DESC_COPY = 1,
+       CQ_DESC_TYPE_WQ_EXCH = 2,
+       CQ_DESC_TYPE_RQ_ENET = 3,
+       CQ_DESC_TYPE_RQ_FCP = 4,
+};
+
+/* Completion queue descriptor: 16B
+ *
+ * All completion queues have this basic layout.  The
+ * type_specific area is unique for each completion
+ * queue type.
+ */
+struct cq_desc {
+       __le16 completed_index;
+       __le16 q_number;
+       u8 type_specific[11];
+       u8 type_color;
+};
+
+#define CQ_DESC_TYPE_BITS        4
+#define CQ_DESC_TYPE_MASK        ((1 << CQ_DESC_TYPE_BITS) - 1)
+#define CQ_DESC_COLOR_MASK       1
+#define CQ_DESC_COLOR_SHIFT      7
+#define CQ_DESC_Q_NUM_BITS       10
+#define CQ_DESC_Q_NUM_MASK       ((1 << CQ_DESC_Q_NUM_BITS) - 1)
+#define CQ_DESC_COMP_NDX_BITS    12
+#define CQ_DESC_COMP_NDX_MASK    ((1 << CQ_DESC_COMP_NDX_BITS) - 1)
+
+static inline void cq_desc_dec(const struct cq_desc *desc_arg,
+       u8 *type, u8 *color, u16 *q_number, u16 *completed_index)
+{
+       const struct cq_desc *desc = desc_arg;
+       const u8 type_color = desc->type_color;
+
+       *color = (type_color >> CQ_DESC_COLOR_SHIFT) & CQ_DESC_COLOR_MASK;
+
+       /*
+        * Make sure color bit is read from desc *before* other fields
+        * are read from desc.  Hardware guarantees color bit is last
+        * bit (byte) written.  Adding the rmb() prevents the compiler
+        * and/or CPU from reordering the reads which would potentially
+        * result in reading stale values.
+        */
+       rmb();
+
+       *type = type_color & CQ_DESC_TYPE_MASK;
+       *q_number = le16_to_cpu(desc->q_number) & CQ_DESC_Q_NUM_MASK;
+       *completed_index = le16_to_cpu(desc->completed_index) &
+               CQ_DESC_COMP_NDX_MASK;
+}
+
+#endif /* _CQ_DESC_H_ */