Adding upstream version 16.2.11+ds.upstream/16.2.11+dsupstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 188 insertions, 0 deletions

diff --git a/src/seastar/dpdk/drivers/net/virtio/virtio_ring.h b/src/seastar/dpdk/drivers/net/virtio/virtio_ring.h
new file mode 100644
index 000000000..7ba34662e
--- /dev/null
+++ b/src/seastar/dpdk/drivers/net/virtio/virtio_ring.h
@@ -0,0 +1,188 @@
+/* SPDX-License-Identifier: BSD-3-Clause
+ * Copyright(c) 2010-2014 Intel Corporation
+ */
+
+#ifndef _VIRTIO_RING_H_
+#define _VIRTIO_RING_H_
+
+#include <stdint.h>
+
+#include <rte_common.h>
+
+/* This marks a buffer as continuing via the next field. */
+#define VRING_DESC_F_NEXT       1
+/* This marks a buffer as write-only (otherwise read-only). */
+#define VRING_DESC_F_WRITE      2
+/* This means the buffer contains a list of buffer descriptors. */
+#define VRING_DESC_F_INDIRECT   4
+
+/* This flag means the descriptor was made available by the driver */
+#define VRING_PACKED_DESC_F_AVAIL	(1 << 7)
+/* This flag means the descriptor was used by the device */
+#define VRING_PACKED_DESC_F_USED	(1 << 15)
+
+/* Frequently used combinations */
+#define VRING_PACKED_DESC_F_AVAIL_USED	(VRING_PACKED_DESC_F_AVAIL | \
+					 VRING_PACKED_DESC_F_USED)
+
+/* The Host uses this in used->flags to advise the Guest: don't kick me
+ * when you add a buffer.  It's unreliable, so it's simply an
+ * optimization.  Guest will still kick if it's out of buffers. */
+#define VRING_USED_F_NO_NOTIFY  1
+/* The Guest uses this in avail->flags to advise the Host: don't
+ * interrupt me when you consume a buffer.  It's unreliable, so it's
+ * simply an optimization.  */
+#define VRING_AVAIL_F_NO_INTERRUPT  1
+
+/* VirtIO ring descriptors: 16 bytes.
+ * These can chain together via "next". */
+struct vring_desc {
+	uint64_t addr;  /*  Address (guest-physical). */
+	uint32_t len;   /* Length. */
+	uint16_t flags; /* The flags as indicated above. */
+	uint16_t next;  /* We chain unused descriptors via this. */
+};
+
+struct vring_avail {
+	uint16_t flags;
+	uint16_t idx;
+	uint16_t ring[0];
+};
+
+/* id is a 16bit index. uint32_t is used here for ids for padding reasons. */
+struct vring_used_elem {
+	/* Index of start of used descriptor chain. */
+	uint32_t id;
+	/* Total length of the descriptor chain which was written to. */
+	uint32_t len;
+};
+
+struct vring_used {
+	uint16_t flags;
+	volatile uint16_t idx;
+	struct vring_used_elem ring[0];
+};
+
+/* For support of packed virtqueues in Virtio 1.1 the format of descriptors
+ * looks like this.
+ */
+struct vring_packed_desc {
+	uint64_t addr;
+	uint32_t len;
+	uint16_t id;
+	uint16_t flags;
+};
+
+#define RING_EVENT_FLAGS_ENABLE 0x0
+#define RING_EVENT_FLAGS_DISABLE 0x1
+#define RING_EVENT_FLAGS_DESC 0x2
+struct vring_packed_desc_event {
+	uint16_t desc_event_off_wrap;
+	uint16_t desc_event_flags;
+};
+
+struct vring_packed {
+	unsigned int num;
+	struct vring_packed_desc *desc;
+	struct vring_packed_desc_event *driver;
+	struct vring_packed_desc_event *device;
+};
+
+struct vring {
+	unsigned int num;
+	struct vring_desc  *desc;
+	struct vring_avail *avail;
+	struct vring_used  *used;
+};
+
+/* The standard layout for the ring is a continuous chunk of memory which
+ * looks like this.  We assume num is a power of 2.
+ *
+ * struct vring {
+ *      // The actual descriptors (16 bytes each)
+ *      struct vring_desc desc[num];
+ *
+ *      // A ring of available descriptor heads with free-running index.
+ *      __u16 avail_flags;
+ *      __u16 avail_idx;
+ *      __u16 available[num];
+ *      __u16 used_event_idx;
+ *
+ *      // Padding to the next align boundary.
+ *      char pad[];
+ *
+ *      // A ring of used descriptor heads with free-running index.
+ *      __u16 used_flags;
+ *      __u16 used_idx;
+ *      struct vring_used_elem used[num];
+ *      __u16 avail_event_idx;
+ * };
+ *
+ * NOTE: for VirtIO PCI, align is 4096.
+ */
+
+/*
+ * We publish the used event index at the end of the available ring, and vice
+ * versa. They are at the end for backwards compatibility.
+ */
+#define vring_used_event(vr)  ((vr)->avail->ring[(vr)->num])
+#define vring_avail_event(vr) (*(uint16_t *)&(vr)->used->ring[(vr)->num])
+
+static inline size_t
+vring_size(struct virtio_hw *hw, unsigned int num, unsigned long align)
+{
+	size_t size;
+
+	if (vtpci_packed_queue(hw)) {
+		size = num * sizeof(struct vring_packed_desc);
+		size += sizeof(struct vring_packed_desc_event);
+		size = RTE_ALIGN_CEIL(size, align);
+		size += sizeof(struct vring_packed_desc_event);
+		return size;
+	}
+
+	size = num * sizeof(struct vring_desc);
+	size += sizeof(struct vring_avail) + (num * sizeof(uint16_t));
+	size = RTE_ALIGN_CEIL(size, align);
+	size += sizeof(struct vring_used) +
+		(num * sizeof(struct vring_used_elem));
+	return size;
+}
+static inline void
+vring_init_split(struct vring *vr, uint8_t *p, unsigned long align,
+	 unsigned int num)
+{
+	vr->num = num;
+	vr->desc = (struct vring_desc *) p;
+	vr->avail = (struct vring_avail *) (p +
+		num * sizeof(struct vring_desc));
+	vr->used = (void *)
+		RTE_ALIGN_CEIL((uintptr_t)(&vr->avail->ring[num]), align);
+}
+
+static inline void
+vring_init_packed(struct vring_packed *vr, uint8_t *p, unsigned long align,
+		 unsigned int num)
+{
+	vr->num = num;
+	vr->desc = (struct vring_packed_desc *)p;
+	vr->driver = (struct vring_packed_desc_event *)(p +
+			vr->num * sizeof(struct vring_packed_desc));
+	vr->device = (struct vring_packed_desc_event *)
+		RTE_ALIGN_CEIL(((uintptr_t)vr->driver +
+				sizeof(struct vring_packed_desc_event)), align);
+}
+
+/*
+ * The following is used with VIRTIO_RING_F_EVENT_IDX.
+ * Assuming a given event_idx value from the other size, if we have
+ * just incremented index from old to new_idx, should we trigger an
+ * event?
+ */
+static inline int
+vring_need_event(uint16_t event_idx, uint16_t new_idx, uint16_t old)
+{
+	return (uint16_t)(new_idx - event_idx - 1) < (uint16_t)(new_idx - old);
+}
+
+#endif /* _VIRTIO_RING_H_ */