Imported upstream release 16.04

* gbp import-orig ../dpdk-16.04.tar.xz

Change-Id: Iac2196db782ba322f6974d8a752acc34ce5024c3
Signed-off-by: C.J. Collier <cjcollier@linuxfoundation.org>

1 files changed, 344 insertions, 0 deletions

diff --git a/drivers/net/virtio/virtqueue.h b/drivers/net/virtio/virtqueue.h
new file mode 100644
index 00000000..4e9239e0
--- /dev/null
+++ b/drivers/net/virtio/virtqueue.h
@@ -0,0 +1,344 @@
+/*-
+ *   BSD LICENSE
+ *
+ *   Copyright(c) 2010-2014 Intel Corporation. All rights reserved.
+ *   All rights reserved.
+ *
+ *   Redistribution and use in source and binary forms, with or without
+ *   modification, are permitted provided that the following conditions
+ *   are met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ *       notice, this list of conditions and the following disclaimer.
+ *     * 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.
+ *     * Neither the name of Intel Corporation nor the names of its
+ *       contributors may be used to endorse or promote products derived
+ *       from this software without specific prior written permission.
+ *
+ *   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
+ *   OWNER 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 _VIRTQUEUE_H_
+#define _VIRTQUEUE_H_
+
+#include <stdint.h>
+
+#include <rte_atomic.h>
+#include <rte_memory.h>
+#include <rte_memzone.h>
+#include <rte_mempool.h>
+
+#include "virtio_pci.h"
+#include "virtio_ring.h"
+#include "virtio_logs.h"
+
+struct rte_mbuf;
+
+/*
+ * Per virtio_config.h in Linux.
+ *     For virtio_pci on SMP, we don't need to order with respect to MMIO
+ *     accesses through relaxed memory I/O windows, so smp_mb() et al are
+ *     sufficient.
+ *
+ */
+#define virtio_mb()	rte_smp_mb()
+#define virtio_rmb()	rte_smp_rmb()
+#define virtio_wmb()	rte_smp_wmb()
+
+#ifdef RTE_PMD_PACKET_PREFETCH
+#define rte_packet_prefetch(p)  rte_prefetch1(p)
+#else
+#define rte_packet_prefetch(p)  do {} while(0)
+#endif
+
+#define VIRTQUEUE_MAX_NAME_SZ 32
+
+#define VTNET_SQ_RQ_QUEUE_IDX 0
+#define VTNET_SQ_TQ_QUEUE_IDX 1
+#define VTNET_SQ_CQ_QUEUE_IDX 2
+
+enum { VTNET_RQ = 0, VTNET_TQ = 1, VTNET_CQ = 2 };
+/**
+ * The maximum virtqueue size is 2^15. Use that value as the end of
+ * descriptor chain terminator since it will never be a valid index
+ * in the descriptor table. This is used to verify we are correctly
+ * handling vq_free_cnt.
+ */
+#define VQ_RING_DESC_CHAIN_END 32768
+
+/**
+ * Control the RX mode, ie. promiscuous, allmulti, etc...
+ * All commands require an "out" sg entry containing a 1 byte
+ * state value, zero = disable, non-zero = enable.  Commands
+ * 0 and 1 are supported with the VIRTIO_NET_F_CTRL_RX feature.
+ * Commands 2-5 are added with VIRTIO_NET_F_CTRL_RX_EXTRA.
+ */
+#define VIRTIO_NET_CTRL_RX              0
+#define VIRTIO_NET_CTRL_RX_PROMISC      0
+#define VIRTIO_NET_CTRL_RX_ALLMULTI     1
+#define VIRTIO_NET_CTRL_RX_ALLUNI       2
+#define VIRTIO_NET_CTRL_RX_NOMULTI      3
+#define VIRTIO_NET_CTRL_RX_NOUNI        4
+#define VIRTIO_NET_CTRL_RX_NOBCAST      5
+
+/**
+ * Control the MAC
+ *
+ * The MAC filter table is managed by the hypervisor, the guest should
+ * assume the size is infinite.  Filtering should be considered
+ * non-perfect, ie. based on hypervisor resources, the guest may
+ * received packets from sources not specified in the filter list.
+ *
+ * In addition to the class/cmd header, the TABLE_SET command requires
+ * two out scatterlists.  Each contains a 4 byte count of entries followed
+ * by a concatenated byte stream of the ETH_ALEN MAC addresses.  The
+ * first sg list contains unicast addresses, the second is for multicast.
+ * This functionality is present if the VIRTIO_NET_F_CTRL_RX feature
+ * is available.
+ *
+ * The ADDR_SET command requests one out scatterlist, it contains a
+ * 6 bytes MAC address. This functionality is present if the
+ * VIRTIO_NET_F_CTRL_MAC_ADDR feature is available.
+ */
+struct virtio_net_ctrl_mac {
+	uint32_t entries;
+	uint8_t macs[][ETHER_ADDR_LEN];
+} __attribute__((__packed__));
+
+#define VIRTIO_NET_CTRL_MAC    1
+ #define VIRTIO_NET_CTRL_MAC_TABLE_SET        0
+ #define VIRTIO_NET_CTRL_MAC_ADDR_SET         1
+
+/**
+ * Control VLAN filtering
+ *
+ * The VLAN filter table is controlled via a simple ADD/DEL interface.
+ * VLAN IDs not added may be filtered by the hypervisor.  Del is the
+ * opposite of add.  Both commands expect an out entry containing a 2
+ * byte VLAN ID.  VLAN filtering is available with the
+ * VIRTIO_NET_F_CTRL_VLAN feature bit.
+ */
+#define VIRTIO_NET_CTRL_VLAN     2
+#define VIRTIO_NET_CTRL_VLAN_ADD 0
+#define VIRTIO_NET_CTRL_VLAN_DEL 1
+
+struct virtio_net_ctrl_hdr {
+	uint8_t class;
+	uint8_t cmd;
+} __attribute__((packed));
+
+typedef uint8_t virtio_net_ctrl_ack;
+
+#define VIRTIO_NET_OK     0
+#define VIRTIO_NET_ERR    1
+
+#define VIRTIO_MAX_CTRL_DATA 2048
+
+struct virtio_pmd_ctrl {
+	struct virtio_net_ctrl_hdr hdr;
+	virtio_net_ctrl_ack status;
+	uint8_t data[VIRTIO_MAX_CTRL_DATA];
+};
+
+struct virtqueue {
+	struct virtio_hw         *hw;     /**< virtio_hw structure pointer. */
+	const struct rte_memzone *mz;     /**< mem zone to populate RX ring. */
+	const struct rte_memzone *virtio_net_hdr_mz; /**< memzone to populate hdr. */
+	struct rte_mempool       *mpool;  /**< mempool for mbuf allocation */
+	uint16_t    queue_id;             /**< DPDK queue index. */
+	uint8_t     port_id;              /**< Device port identifier. */
+	uint16_t    vq_queue_index;       /**< PCI queue index */
+
+	void        *vq_ring_virt_mem;    /**< linear address of vring*/
+	unsigned int vq_ring_size;
+	phys_addr_t vq_ring_mem;          /**< physical address of vring */
+
+	struct vring vq_ring;    /**< vring keeping desc, used and avail */
+	uint16_t    vq_free_cnt; /**< num of desc available */
+	uint16_t    vq_nentries; /**< vring desc numbers */
+	uint16_t    vq_free_thresh; /**< free threshold */
+	/**
+	 * Head of the free chain in the descriptor table. If
+	 * there are no free descriptors, this will be set to
+	 * VQ_RING_DESC_CHAIN_END.
+	 */
+	uint16_t  vq_desc_head_idx;
+	uint16_t  vq_desc_tail_idx;
+	/**
+	 * Last consumed descriptor in the used table,
+	 * trails vq_ring.used->idx.
+	 */
+	uint16_t vq_used_cons_idx;
+	uint16_t vq_avail_idx;
+	uint64_t mbuf_initializer; /**< value to init mbufs. */
+	phys_addr_t virtio_net_hdr_mem; /**< hdr for each xmit packet */
+
+	struct rte_mbuf **sw_ring; /**< RX software ring. */
+	/* dummy mbuf, for wraparound when processing RX ring. */
+	struct rte_mbuf fake_mbuf;
+
+	/* Statistics */
+	uint64_t	packets;
+	uint64_t	bytes;
+	uint64_t	errors;
+	uint64_t	multicast;
+	uint64_t	broadcast;
+	/* Size bins in array as RFC 2819, undersized [0], 64 [1], etc */
+	uint64_t	size_bins[8];
+
+	uint16_t	*notify_addr;
+
+	struct vq_desc_extra {
+		void              *cookie;
+		uint16_t          ndescs;
+	} vq_descx[0];
+};
+
+/* If multiqueue is provided by host, then we suppport it. */
+#define VIRTIO_NET_CTRL_MQ   4
+#define VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET        0
+#define VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MIN        1
+#define VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MAX        0x8000
+
+#define VIRTIO_NET_CTRL_MAC_ADDR_SET         1
+
+/**
+ * This is the first element of the scatter-gather list.  If you don't
+ * specify GSO or CSUM features, you can simply ignore the header.
+ */
+struct virtio_net_hdr {
+#define VIRTIO_NET_HDR_F_NEEDS_CSUM 1    /**< Use csum_start,csum_offset*/
+	uint8_t flags;
+#define VIRTIO_NET_HDR_GSO_NONE     0    /**< Not a GSO frame */
+#define VIRTIO_NET_HDR_GSO_TCPV4    1    /**< GSO frame, IPv4 TCP (TSO) */
+#define VIRTIO_NET_HDR_GSO_UDP      3    /**< GSO frame, IPv4 UDP (UFO) */
+#define VIRTIO_NET_HDR_GSO_TCPV6    4    /**< GSO frame, IPv6 TCP */
+#define VIRTIO_NET_HDR_GSO_ECN      0x80 /**< TCP has ECN set */
+	uint8_t gso_type;
+	uint16_t hdr_len;     /**< Ethernet + IP + tcp/udp hdrs */
+	uint16_t gso_size;    /**< Bytes to append to hdr_len per frame */
+	uint16_t csum_start;  /**< Position to start checksumming from */
+	uint16_t csum_offset; /**< Offset after that to place checksum */
+};
+
+/**
+ * This is the version of the header to use when the MRG_RXBUF
+ * feature has been negotiated.
+ */
+struct virtio_net_hdr_mrg_rxbuf {
+	struct   virtio_net_hdr hdr;
+	uint16_t num_buffers; /**< Number of merged rx buffers */
+};
+
+/* Region reserved to allow for transmit header and indirect ring */
+#define VIRTIO_MAX_TX_INDIRECT 8
+struct virtio_tx_region {
+	struct virtio_net_hdr_mrg_rxbuf tx_hdr;
+	struct vring_desc tx_indir[VIRTIO_MAX_TX_INDIRECT]
+			   __attribute__((__aligned__(16)));
+};
+
+/* Chain all the descriptors in the ring with an END */
+static inline void
+vring_desc_init(struct vring_desc *dp, uint16_t n)
+{
+	uint16_t i;
+
+	for (i = 0; i < n - 1; i++)
+		dp[i].next = (uint16_t)(i + 1);
+	dp[i].next = VQ_RING_DESC_CHAIN_END;
+}
+
+/**
+ * Tell the backend not to interrupt us.
+ */
+void virtqueue_disable_intr(struct virtqueue *vq);
+/**
+ *  Dump virtqueue internal structures, for debug purpose only.
+ */
+void virtqueue_dump(struct virtqueue *vq);
+/**
+ *  Get all mbufs to be freed.
+ */
+struct rte_mbuf *virtqueue_detatch_unused(struct virtqueue *vq);
+
+static inline int
+virtqueue_full(const struct virtqueue *vq)
+{
+	return vq->vq_free_cnt == 0;
+}
+
+#define VIRTQUEUE_NUSED(vq) ((uint16_t)((vq)->vq_ring.used->idx - (vq)->vq_used_cons_idx))
+
+static inline void
+vq_update_avail_idx(struct virtqueue *vq)
+{
+	virtio_wmb();
+	vq->vq_ring.avail->idx = vq->vq_avail_idx;
+}
+
+static inline void
+vq_update_avail_ring(struct virtqueue *vq, uint16_t desc_idx)
+{
+	uint16_t avail_idx;
+	/*
+	 * Place the head of the descriptor chain into the next slot and make
+	 * it usable to the host. The chain is made available now rather than
+	 * deferring to virtqueue_notify() in the hopes that if the host is
+	 * currently running on another CPU, we can keep it processing the new
+	 * descriptor.
+	 */
+	avail_idx = (uint16_t)(vq->vq_avail_idx & (vq->vq_nentries - 1));
+	vq->vq_ring.avail->ring[avail_idx] = desc_idx;
+	vq->vq_avail_idx++;
+}
+
+static inline int
+virtqueue_kick_prepare(struct virtqueue *vq)
+{
+	return !(vq->vq_ring.used->flags & VRING_USED_F_NO_NOTIFY);
+}
+
+static inline void
+virtqueue_notify(struct virtqueue *vq)
+{
+	/*
+	 * Ensure updated avail->idx is visible to host.
+	 * For virtio on IA, the notificaiton is through io port operation
+	 * which is a serialization instruction itself.
+	 */
+	vq->hw->vtpci_ops->notify_queue(vq->hw, vq);
+}
+
+#ifdef RTE_LIBRTE_VIRTIO_DEBUG_DUMP
+#define VIRTQUEUE_DUMP(vq) do { \
+	uint16_t used_idx, nused; \
+	used_idx = (vq)->vq_ring.used->idx; \
+	nused = (uint16_t)(used_idx - (vq)->vq_used_cons_idx); \
+	PMD_INIT_LOG(DEBUG, \
+	  "VQ: - size=%d; free=%d; used=%d; desc_head_idx=%d;" \
+	  " avail.idx=%d; used_cons_idx=%d; used.idx=%d;" \
+	  " avail.flags=0x%x; used.flags=0x%x", \
+	  (vq)->vq_nentries, (vq)->vq_free_cnt, nused, \
+	  (vq)->vq_desc_head_idx, (vq)->vq_ring.avail->idx, \
+	  (vq)->vq_used_cons_idx, (vq)->vq_ring.used->idx, \
+	  (vq)->vq_ring.avail->flags, (vq)->vq_ring.used->flags); \
+} while (0)
+#else
+#define VIRTQUEUE_DUMP(vq) do { } while (0)
+#endif
+
+#endif /* _VIRTQUEUE_H_ */