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39 #include <rte_atomic.h>
41 #include <rte_memory.h>
42 #include <rte_memzone.h>
43 #include <rte_mempool.h>
45 #include "virtio_pci.h"
46 #include "virtio_ring.h"
47 #include "virtio_logs.h"
50 * Per virtio_config.h in Linux.
51 * For virtio_pci on SMP, we don't need to order with respect to MMIO
52 * accesses through relaxed memory I/O windows, so smp_mb() et al are
55 * This driver is for virtio_pci on SMP and therefore can assume
56 * weaker (compiler barriers)
58 #define virtio_mb() rte_mb()
59 #define virtio_rmb() rte_compiler_barrier()
60 #define virtio_wmb() rte_compiler_barrier()
62 #ifdef RTE_PMD_PACKET_PREFETCH
63 #define rte_packet_prefetch(p) rte_prefetch1(p)
65 #define rte_packet_prefetch(p) do {} while(0)
68 #define VIRTQUEUE_MAX_NAME_SZ 32
70 #define RTE_MBUF_DATA_DMA_ADDR(mb) \
71 (uint64_t) ((mb)->buf_physaddr + (mb)->data_off)
73 #define VTNET_SQ_RQ_QUEUE_IDX 0
74 #define VTNET_SQ_TQ_QUEUE_IDX 1
75 #define VTNET_SQ_CQ_QUEUE_IDX 2
77 enum { VTNET_RQ = 0, VTNET_TQ = 1, VTNET_CQ = 2 };
79 * The maximum virtqueue size is 2^15. Use that value as the end of
80 * descriptor chain terminator since it will never be a valid index
81 * in the descriptor table. This is used to verify we are correctly
82 * handling vq_free_cnt.
84 #define VQ_RING_DESC_CHAIN_END 32768
87 * Control the RX mode, ie. promiscuous, allmulti, etc...
88 * All commands require an "out" sg entry containing a 1 byte
89 * state value, zero = disable, non-zero = enable. Commands
90 * 0 and 1 are supported with the VIRTIO_NET_F_CTRL_RX feature.
91 * Commands 2-5 are added with VIRTIO_NET_F_CTRL_RX_EXTRA.
93 #define VIRTIO_NET_CTRL_RX 0
94 #define VIRTIO_NET_CTRL_RX_PROMISC 0
95 #define VIRTIO_NET_CTRL_RX_ALLMULTI 1
96 #define VIRTIO_NET_CTRL_RX_ALLUNI 2
97 #define VIRTIO_NET_CTRL_RX_NOMULTI 3
98 #define VIRTIO_NET_CTRL_RX_NOUNI 4
99 #define VIRTIO_NET_CTRL_RX_NOBCAST 5
102 * Control VLAN filtering
104 * The VLAN filter table is controlled via a simple ADD/DEL interface.
105 * VLAN IDs not added may be filtered by the hypervisor. Del is the
106 * opposite of add. Both commands expect an out entry containing a 2
107 * byte VLAN ID. VLAN filtering is available with the
108 * VIRTIO_NET_F_CTRL_VLAN feature bit.
110 #define VIRTIO_NET_CTRL_VLAN 2
111 #define VIRTIO_NET_CTRL_VLAN_ADD 0
112 #define VIRTIO_NET_CTRL_VLAN_DEL 1
114 struct virtio_net_ctrl_hdr {
117 } __attribute__((packed));
119 typedef uint8_t virtio_net_ctrl_ack;
121 #define VIRTIO_NET_OK 0
122 #define VIRTIO_NET_ERR 1
124 #define VIRTIO_MAX_CTRL_DATA 128
126 struct virtio_pmd_ctrl {
127 struct virtio_net_ctrl_hdr hdr;
128 virtio_net_ctrl_ack status;
129 uint8_t data[VIRTIO_MAX_CTRL_DATA];
133 struct virtio_hw *hw; /**< virtio_hw structure pointer. */
134 const struct rte_memzone *mz; /**< mem zone to populate RX ring. */
135 const struct rte_memzone *virtio_net_hdr_mz; /**< memzone to populate hdr. */
136 struct rte_mempool *mpool; /**< mempool for mbuf allocation */
137 uint16_t queue_id; /**< DPDK queue index. */
138 uint8_t port_id; /**< Device port identifier. */
140 void *vq_ring_virt_mem; /**< linear address of vring*/
141 unsigned int vq_ring_size;
142 phys_addr_t vq_ring_mem; /**< physical address of vring */
144 struct vring vq_ring; /**< vring keeping desc, used and avail */
145 uint16_t vq_free_cnt; /**< num of desc available */
146 uint16_t vq_nentries; /**< vring desc numbers */
147 uint16_t vq_queue_index; /**< PCI queue index */
149 * Head of the free chain in the descriptor table. If
150 * there are no free descriptors, this will be set to
151 * VQ_RING_DESC_CHAIN_END.
153 uint16_t vq_desc_head_idx;
154 uint16_t vq_desc_tail_idx;
156 * Last consumed descriptor in the used table,
157 * trails vq_ring.used->idx.
159 uint16_t vq_used_cons_idx;
160 uint16_t vq_avail_idx;
161 phys_addr_t virtio_net_hdr_mem; /**< hdr for each xmit packet */
168 struct vq_desc_extra {
174 /* If multiqueue is provided by host, then we suppport it. */
175 #ifndef VIRTIO_NET_F_MQ
176 /* Device supports Receive Flow Steering */
177 #define VIRTIO_NET_F_MQ 0x400000
178 #define VIRTIO_NET_CTRL_MQ 4
179 #define VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET 0
180 #define VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MIN 1
181 #define VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MAX 0x8000
185 * This is the first element of the scatter-gather list. If you don't
186 * specify GSO or CSUM features, you can simply ignore the header.
188 struct virtio_net_hdr {
189 #define VIRTIO_NET_HDR_F_NEEDS_CSUM 1 /**< Use csum_start,csum_offset*/
191 #define VIRTIO_NET_HDR_GSO_NONE 0 /**< Not a GSO frame */
192 #define VIRTIO_NET_HDR_GSO_TCPV4 1 /**< GSO frame, IPv4 TCP (TSO) */
193 #define VIRTIO_NET_HDR_GSO_UDP 3 /**< GSO frame, IPv4 UDP (UFO) */
194 #define VIRTIO_NET_HDR_GSO_TCPV6 4 /**< GSO frame, IPv6 TCP */
195 #define VIRTIO_NET_HDR_GSO_ECN 0x80 /**< TCP has ECN set */
197 uint16_t hdr_len; /**< Ethernet + IP + tcp/udp hdrs */
198 uint16_t gso_size; /**< Bytes to append to hdr_len per frame */
199 uint16_t csum_start; /**< Position to start checksumming from */
200 uint16_t csum_offset; /**< Offset after that to place checksum */
204 * This is the version of the header to use when the MRG_RXBUF
205 * feature has been negotiated.
207 struct virtio_net_hdr_mrg_rxbuf {
208 struct virtio_net_hdr hdr;
209 uint16_t num_buffers; /**< Number of merged rx buffers */
213 * Tell the backend not to interrupt us.
215 void virtqueue_disable_intr(struct virtqueue *vq);
217 * Dump virtqueue internal structures, for debug purpose only.
219 void virtqueue_dump(struct virtqueue *vq);
221 * Get all mbufs to be freed.
223 struct rte_mbuf *virtqueue_detatch_unused(struct virtqueue *vq);
226 virtqueue_full(const struct virtqueue *vq)
228 return vq->vq_free_cnt == 0;
231 #define VIRTQUEUE_NUSED(vq) ((uint16_t)((vq)->vq_ring.used->idx - (vq)->vq_used_cons_idx))
234 vq_update_avail_idx(struct virtqueue *vq)
237 vq->vq_ring.avail->idx = vq->vq_avail_idx;
241 vq_update_avail_ring(struct virtqueue *vq, uint16_t desc_idx)
245 * Place the head of the descriptor chain into the next slot and make
246 * it usable to the host. The chain is made available now rather than
247 * deferring to virtqueue_notify() in the hopes that if the host is
248 * currently running on another CPU, we can keep it processing the new
251 avail_idx = (uint16_t)(vq->vq_avail_idx & (vq->vq_nentries - 1));
252 vq->vq_ring.avail->ring[avail_idx] = desc_idx;
257 virtqueue_kick_prepare(struct virtqueue *vq)
259 return !(vq->vq_ring.used->flags & VRING_USED_F_NO_NOTIFY);
263 virtqueue_notify(struct virtqueue *vq)
266 * Ensure updated avail->idx is visible to host.
267 * For virtio on IA, the notificaiton is through io port operation
268 * which is a serialization instruction itself.
270 VIRTIO_WRITE_REG_2(vq->hw, VIRTIO_PCI_QUEUE_NOTIFY, vq->vq_queue_index);
273 #ifdef RTE_LIBRTE_VIRTIO_DEBUG_DUMP
274 #define VIRTQUEUE_DUMP(vq) do { \
275 uint16_t used_idx, nused; \
276 used_idx = (vq)->vq_ring.used->idx; \
277 nused = (uint16_t)(used_idx - (vq)->vq_used_cons_idx); \
278 PMD_INIT_LOG(DEBUG, \
279 "VQ: - size=%d; free=%d; used=%d; desc_head_idx=%d;" \
280 " avail.idx=%d; used_cons_idx=%d; used.idx=%d;" \
281 " avail.flags=0x%x; used.flags=0x%x", \
282 (vq)->vq_nentries, (vq)->vq_free_cnt, nused, \
283 (vq)->vq_desc_head_idx, (vq)->vq_ring.avail->idx, \
284 (vq)->vq_used_cons_idx, (vq)->vq_ring.used->idx, \
285 (vq)->vq_ring.avail->flags, (vq)->vq_ring.used->flags); \
288 #define VIRTQUEUE_DUMP(vq) do { } while (0)
291 #endif /* _VIRTQUEUE_H_ */