Imported Upstream version 16.04

[deb_dpdk.git] / drivers / net / enic / base / enic_vnic_wq.h

diff --git a/drivers/net/enic/base/enic_vnic_wq.h b/drivers/net/enic/base/enic_vnic_wq.h
new file mode 100644 (file)
index 0000000..b019109
--- /dev/null
+++ b/drivers/net/enic/base/enic_vnic_wq.h
@@ -0,0 +1,79 @@
+/*
+ * Copyright 2008-2015 Cisco Systems, Inc.  All rights reserved.
+ * Copyright 2007 Nuova Systems, Inc.  All rights reserved.
+ *
+ * Copyright (c) 2015, Cisco Systems, Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in
+ * the documentation and/or other materials provided with the
+ * distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+#ifndef _ENIC_VNIC_WQ_H_
+#define _ENIC_VNIC_WQ_H_
+
+#include "vnic_dev.h"
+#include "vnic_cq.h"
+
+static inline void enic_vnic_post_wq_index(struct vnic_wq *wq)
+{
+       struct vnic_wq_buf *buf = wq->to_use;
+
+       /* Adding write memory barrier prevents compiler and/or CPU
+        * reordering, thus avoiding descriptor posting before
+        * descriptor is initialized. Otherwise, hardware can read
+        * stale descriptor fields.
+       */
+       wmb();
+       iowrite32(buf->index, &wq->ctrl->posted_index);
+}
+
+static inline void enic_vnic_post_wq(struct vnic_wq *wq,
+                                    void *os_buf, dma_addr_t dma_addr,
+                                    unsigned int len, int sop,
+                                    uint8_t desc_skip_cnt, uint8_t cq_entry,
+                                    uint8_t compressed_send, uint64_t wrid)
+{
+       struct vnic_wq_buf *buf = wq->to_use;
+
+       buf->sop = sop;
+       buf->cq_entry = cq_entry;
+       buf->compressed_send = compressed_send;
+       buf->desc_skip_cnt = desc_skip_cnt;
+       buf->os_buf = os_buf;
+       buf->dma_addr = dma_addr;
+       buf->len = len;
+       buf->wr_id = wrid;
+
+       buf = buf->next;
+       wq->ring.desc_avail -= desc_skip_cnt;
+       wq->to_use = buf;
+
+       if (cq_entry)
+               enic_vnic_post_wq_index(wq);
+}
+
+#endif /* _ENIC_VNIC_WQ_H_ */