#include <vlib/vlib.h>
#include <vlib/unix/unix.h>
-#include <vnet/ip/ip.h>
-
#include <vnet/ethernet/ethernet.h>
#include <vnet/devices/devices.h>
#include <vnet/feature/feature.h>
+#include <vnet/udp/udp_packet.h>
#include <vnet/devices/virtio/vhost_user.h>
#include <vnet/devices/virtio/vhost_user_inline.h>
_(MMAP_FAIL, "mmap failure") \
_(INDIRECT_OVERFLOW, "indirect descriptor overflows table") \
_(UNDERSIZED_FRAME, "undersized ethernet frame received (< 14 bytes)") \
+ _(NOT_READY, "vhost interface not ready or down") \
_(FULL_RX_QUEUE, "full rx queue (possible driver tx drop)")
typedef enum
t->qid = qid;
hdr_desc = &txvq->desc[desc_current];
- if (txvq->desc[desc_current].flags & VIRTQ_DESC_F_INDIRECT)
+ if (txvq->desc[desc_current].flags & VRING_DESC_F_INDIRECT)
{
t->virtio_ring_flags |= 1 << VIRTIO_TRACE_F_INDIRECT;
/* Header is the first here */
hdr_desc = map_guest_mem (vui, txvq->desc[desc_current].addr, &hint);
}
- if (txvq->desc[desc_current].flags & VIRTQ_DESC_F_NEXT)
+ if (txvq->desc[desc_current].flags & VRING_DESC_F_NEXT)
{
t->virtio_ring_flags |= 1 << VIRTIO_TRACE_F_SIMPLE_CHAINED;
}
- if (!(txvq->desc[desc_current].flags & VIRTQ_DESC_F_NEXT) &&
- !(txvq->desc[desc_current].flags & VIRTQ_DESC_F_INDIRECT))
+ if (!(txvq->desc[desc_current].flags & VRING_DESC_F_NEXT) &&
+ !(txvq->desc[desc_current].flags & VRING_DESC_F_INDIRECT))
{
t->virtio_ring_flags |= 1 << VIRTIO_TRACE_F_SINGLE_DESC;
}
cpu->rx_buffers_len++;
}
+static_always_inline void
+vhost_user_handle_rx_offload (vlib_buffer_t * b0, u8 * b0_data,
+ virtio_net_hdr_t * hdr)
+{
+ u8 l4_hdr_sz = 0;
+ u8 l4_proto = 0;
+ ethernet_header_t *eh = (ethernet_header_t *) b0_data;
+ u16 ethertype = clib_net_to_host_u16 (eh->type);
+ u16 l2hdr_sz = sizeof (ethernet_header_t);
+
+ if (ethernet_frame_is_tagged (ethertype))
+ {
+ ethernet_vlan_header_t *vlan = (ethernet_vlan_header_t *) (eh + 1);
+
+ ethertype = clib_net_to_host_u16 (vlan->type);
+ l2hdr_sz += sizeof (*vlan);
+ if (ethertype == ETHERNET_TYPE_VLAN)
+ {
+ vlan++;
+ ethertype = clib_net_to_host_u16 (vlan->type);
+ l2hdr_sz += sizeof (*vlan);
+ }
+ }
+ vnet_buffer (b0)->l2_hdr_offset = 0;
+ vnet_buffer (b0)->l3_hdr_offset = l2hdr_sz;
+ vnet_buffer (b0)->l4_hdr_offset = hdr->csum_start;
+ b0->flags |= (VNET_BUFFER_F_L2_HDR_OFFSET_VALID |
+ VNET_BUFFER_F_L3_HDR_OFFSET_VALID |
+ VNET_BUFFER_F_L4_HDR_OFFSET_VALID);
+
+ if (PREDICT_TRUE (ethertype == ETHERNET_TYPE_IP4))
+ {
+ ip4_header_t *ip4 = (ip4_header_t *) (b0_data + l2hdr_sz);
+ l4_proto = ip4->protocol;
+ b0->flags |= VNET_BUFFER_F_IS_IP4 | VNET_BUFFER_F_OFFLOAD_IP_CKSUM;
+ }
+ else if (PREDICT_TRUE (ethertype == ETHERNET_TYPE_IP6))
+ {
+ ip6_header_t *ip6 = (ip6_header_t *) (b0_data + l2hdr_sz);
+ l4_proto = ip6->protocol;
+ b0->flags |= VNET_BUFFER_F_IS_IP6;
+ }
+
+ if (l4_proto == IP_PROTOCOL_TCP)
+ {
+ tcp_header_t *tcp = (tcp_header_t *)
+ (b0_data + vnet_buffer (b0)->l4_hdr_offset);
+ l4_hdr_sz = tcp_header_bytes (tcp);
+ b0->flags |= VNET_BUFFER_F_OFFLOAD_TCP_CKSUM;
+ }
+ else if (l4_proto == IP_PROTOCOL_UDP)
+ {
+ l4_hdr_sz = sizeof (udp_header_t);
+ b0->flags |= VNET_BUFFER_F_OFFLOAD_UDP_CKSUM;
+ }
+
+ if (hdr->gso_type == VIRTIO_NET_HDR_GSO_UDP)
+ {
+ vnet_buffer2 (b0)->gso_size = hdr->gso_size;
+ vnet_buffer2 (b0)->gso_l4_hdr_sz = l4_hdr_sz;
+ b0->flags |= VNET_BUFFER_F_GSO;
+ }
+ else if (hdr->gso_type == VIRTIO_NET_HDR_GSO_TCPV4)
+ {
+ vnet_buffer2 (b0)->gso_size = hdr->gso_size;
+ vnet_buffer2 (b0)->gso_l4_hdr_sz = l4_hdr_sz;
+ b0->flags |= (VNET_BUFFER_F_GSO | VNET_BUFFER_F_IS_IP4);
+ }
+ else if (hdr->gso_type == VIRTIO_NET_HDR_GSO_TCPV6)
+ {
+ vnet_buffer2 (b0)->gso_size = hdr->gso_size;
+ vnet_buffer2 (b0)->gso_l4_hdr_sz = l4_hdr_sz;
+ b0->flags |= (VNET_BUFFER_F_GSO | VNET_BUFFER_F_IS_IP6);
+ }
+}
+
+static_always_inline void
+vhost_user_input_do_interrupt (vlib_main_t * vm, vhost_user_intf_t * vui,
+ vhost_user_vring_t * txvq,
+ vhost_user_vring_t * rxvq)
+{
+ f64 now = vlib_time_now (vm);
+
+ if ((txvq->n_since_last_int) && (txvq->int_deadline < now))
+ vhost_user_send_call (vm, vui, txvq);
+
+ if ((rxvq->n_since_last_int) && (rxvq->int_deadline < now))
+ vhost_user_send_call (vm, vui, rxvq);
+}
+
+static_always_inline void
+vhost_user_input_setup_frame (vlib_main_t * vm, vlib_node_runtime_t * node,
+ vhost_user_intf_t * vui,
+ u32 * current_config_index, u32 * next_index,
+ u32 ** to_next, u32 * n_left_to_next)
+{
+ vnet_feature_main_t *fm = &feature_main;
+ u8 feature_arc_idx = fm->device_input_feature_arc_index;
+
+ if (PREDICT_FALSE (vnet_have_features (feature_arc_idx, vui->sw_if_index)))
+ {
+ vnet_feature_config_main_t *cm;
+ cm = &fm->feature_config_mains[feature_arc_idx];
+ *current_config_index = vec_elt (cm->config_index_by_sw_if_index,
+ vui->sw_if_index);
+ vnet_get_config_data (&cm->config_main, current_config_index,
+ next_index, 0);
+ }
+
+ vlib_get_new_next_frame (vm, node, *next_index, *to_next, *n_left_to_next);
+
+ if (*next_index == VNET_DEVICE_INPUT_NEXT_ETHERNET_INPUT)
+ {
+ /* give some hints to ethernet-input */
+ vlib_next_frame_t *nf;
+ vlib_frame_t *f;
+ ethernet_input_frame_t *ef;
+ nf = vlib_node_runtime_get_next_frame (vm, node, *next_index);
+ f = vlib_get_frame (vm, nf->frame);
+ f->flags = ETH_INPUT_FRAME_F_SINGLE_SW_IF_IDX;
+
+ ef = vlib_frame_scalar_args (f);
+ ef->sw_if_index = vui->sw_if_index;
+ ef->hw_if_index = vui->hw_if_index;
+ vlib_frame_no_append (f);
+ }
+}
+
static_always_inline u32
vhost_user_if_input (vlib_main_t * vm,
vhost_user_main_t * vum,
vhost_user_intf_t * vui,
u16 qid, vlib_node_runtime_t * node,
- vnet_hw_interface_rx_mode mode)
+ vnet_hw_if_rx_mode mode, u8 enable_csum)
{
vhost_user_vring_t *txvq = &vui->vrings[VHOST_VRING_IDX_TX (qid)];
vnet_feature_main_t *fm = &feature_main;
{
/* do we have pending interrupts ? */
vhost_user_vring_t *rxvq = &vui->vrings[VHOST_VRING_IDX_RX (qid)];
- f64 now = vlib_time_now (vm);
-
- if ((txvq->n_since_last_int) && (txvq->int_deadline < now))
- vhost_user_send_call (vm, txvq);
-
- if ((rxvq->n_since_last_int) && (rxvq->int_deadline < now))
- vhost_user_send_call (vm, rxvq);
+ vhost_user_input_do_interrupt (vm, vui, txvq, rxvq);
}
/*
* When the traffic subsides, the scheduler switches the node back to
* interrupt mode. We must tell the driver we want interrupt.
*/
- if (PREDICT_FALSE (mode == VNET_HW_INTERFACE_RX_MODE_ADAPTIVE))
+ if (PREDICT_FALSE (mode == VNET_HW_IF_RX_MODE_ADAPTIVE))
{
if ((node->flags &
VLIB_NODE_FLAG_SWITCH_FROM_POLLING_TO_INTERRUPT_MODE) ||
/*
* For small packets (<2kB), we will not need more than one vlib buffer
- * per packet. In case packets are bigger, we will just yeld at some point
+ * per packet. In case packets are bigger, we will just yield at some point
* in the loop and come back later. This is not an issue as for big packet,
* processing cost really comes from the memory copy.
* The assumption is that big packets will fit in 40 buffers.
}
}
- if (PREDICT_FALSE (vnet_have_features (feature_arc_idx, vui->sw_if_index)))
- {
- vnet_feature_config_main_t *cm;
- cm = &fm->feature_config_mains[feature_arc_idx];
- current_config_index = vec_elt (cm->config_index_by_sw_if_index,
- vui->sw_if_index);
- vnet_get_config_data (&cm->config_main, ¤t_config_index,
- &next_index, 0);
- }
+ vhost_user_input_setup_frame (vm, node, vui, ¤t_config_index,
+ &next_index, &to_next, &n_left_to_next);
u16 last_avail_idx = txvq->last_avail_idx;
u16 last_used_idx = txvq->last_used_idx;
- vlib_get_new_next_frame (vm, node, next_index, to_next, n_left_to_next);
-
- if (next_index == VNET_DEVICE_INPUT_NEXT_ETHERNET_INPUT)
- {
- /* give some hints to ethernet-input */
- vlib_next_frame_t *nf;
- vlib_frame_t *f;
- ethernet_input_frame_t *ef;
- nf = vlib_node_runtime_get_next_frame (vm, node, next_index);
- f = vlib_get_frame (vm, nf->frame_index);
- f->flags = ETH_INPUT_FRAME_F_SINGLE_SW_IF_IDX;
-
- ef = vlib_frame_scalar_args (f);
- ef->sw_if_index = vui->sw_if_index;
- ef->hw_if_index = vui->hw_if_index;
- vlib_frame_no_append (f);
- }
-
while (n_left > 0)
{
vlib_buffer_t *b_head, *b_current;
b_head->total_length_not_including_first_buffer = 0;
b_head->flags |= VLIB_BUFFER_TOTAL_LENGTH_VALID;
- if (PREDICT_FALSE (n_trace))
+ if (PREDICT_FALSE
+ (n_trace > 0 && vlib_trace_buffer (vm, node, next_index, b_head,
+ /* follow_chain */ 0)))
{
- //TODO: next_index is not exactly known at that point
- vlib_trace_buffer (vm, node, next_index, b_head,
- /* follow_chain */ 0);
vhost_trace_t *t0 =
vlib_add_trace (vm, node, b_head, sizeof (t0[0]));
vhost_user_rx_trace (t0, vui, qid, b_head, txvq, last_avail_idx);
/* This depends on the setup but is very consistent
* So I think the CPU branch predictor will make a pretty good job
* at optimizing the decision. */
- if (txvq->desc[desc_current].flags & VIRTQ_DESC_F_INDIRECT)
+ if (txvq->desc[desc_current].flags & VRING_DESC_F_INDIRECT)
{
desc_table = map_guest_mem (vui, txvq->desc[desc_current].addr,
&map_hint);
}
}
- if (PREDICT_TRUE (vui->is_any_layout) ||
- (!(desc_table[desc_current].flags & VIRTQ_DESC_F_NEXT)))
- {
- /* ANYLAYOUT or single buffer */
- desc_data_offset = vui->virtio_net_hdr_sz;
- }
- else
+ desc_data_offset = vui->virtio_net_hdr_sz;
+
+ if (enable_csum)
{
- /* CSR case without ANYLAYOUT, skip 1st buffer */
- desc_data_offset = desc_table[desc_current].len;
+ virtio_net_hdr_mrg_rxbuf_t *hdr;
+ u8 *b_data;
+ u16 current;
+
+ hdr = map_guest_mem (vui, desc_table[desc_current].addr, &map_hint);
+ if (PREDICT_FALSE (hdr == 0))
+ {
+ vlib_error_count (vm, node->node_index,
+ VHOST_USER_INPUT_FUNC_ERROR_MMAP_FAIL, 1);
+ goto out;
+ }
+ if (hdr->hdr.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM)
+ {
+ if ((desc_data_offset == desc_table[desc_current].len) &&
+ (desc_table[desc_current].flags & VRING_DESC_F_NEXT))
+ {
+ current = desc_table[desc_current].next;
+ b_data = map_guest_mem (vui, desc_table[current].addr,
+ &map_hint);
+ if (PREDICT_FALSE (b_data == 0))
+ {
+ vlib_error_count (vm, node->node_index,
+ VHOST_USER_INPUT_FUNC_ERROR_MMAP_FAIL,
+ 1);
+ goto out;
+ }
+ }
+ else
+ b_data = (u8 *) hdr + desc_data_offset;
+
+ vhost_user_handle_rx_offload (b_head, b_data, &hdr->hdr);
+ }
}
while (1)
if (desc_data_offset == desc_table[desc_current].len)
{
if (PREDICT_FALSE (desc_table[desc_current].flags &
- VIRTQ_DESC_F_NEXT))
+ VRING_DESC_F_NEXT))
{
desc_current = desc_table[desc_current].next;
desc_data_offset = 0;
}
/* Prepare a copy order executed later for the data */
+ ASSERT (copy_len < VHOST_USER_COPY_ARRAY_N);
vhost_copy_t *cpy = &cpu->copy[copy_len];
copy_len++;
u32 desc_data_l = desc_table[desc_current].len - desc_data_offset;
txvq->n_since_last_int += n_rx_packets;
if (txvq->n_since_last_int > vum->coalesce_frames)
- vhost_user_send_call (vm, txvq);
+ vhost_user_send_call (vm, vui, txvq);
}
/* increase rx counters */
return n_rx_packets;
}
+static_always_inline void
+vhost_user_mark_desc_consumed (vhost_user_intf_t * vui,
+ vhost_user_vring_t * txvq, u16 desc_head,
+ u16 n_descs_processed)
+{
+ vring_packed_desc_t *desc_table = txvq->packed_desc;
+ u16 desc_idx;
+ u16 mask = txvq->qsz_mask;
+
+ for (desc_idx = 0; desc_idx < n_descs_processed; desc_idx++)
+ {
+ if (txvq->used_wrap_counter)
+ desc_table[(desc_head + desc_idx) & mask].flags |=
+ (VRING_DESC_F_AVAIL | VRING_DESC_F_USED);
+ else
+ desc_table[(desc_head + desc_idx) & mask].flags &=
+ ~(VRING_DESC_F_AVAIL | VRING_DESC_F_USED);
+ vhost_user_advance_last_used_idx (txvq);
+ }
+}
+
+static_always_inline void
+vhost_user_rx_trace_packed (vhost_trace_t * t, vhost_user_intf_t * vui,
+ u16 qid, vhost_user_vring_t * txvq,
+ u16 desc_current)
+{
+ vhost_user_main_t *vum = &vhost_user_main;
+ vring_packed_desc_t *hdr_desc;
+ virtio_net_hdr_mrg_rxbuf_t *hdr;
+ u32 hint = 0;
+
+ clib_memset (t, 0, sizeof (*t));
+ t->device_index = vui - vum->vhost_user_interfaces;
+ t->qid = qid;
+
+ hdr_desc = &txvq->packed_desc[desc_current];
+ if (txvq->packed_desc[desc_current].flags & VRING_DESC_F_INDIRECT)
+ {
+ t->virtio_ring_flags |= 1 << VIRTIO_TRACE_F_INDIRECT;
+ /* Header is the first here */
+ hdr_desc = map_guest_mem (vui, txvq->packed_desc[desc_current].addr,
+ &hint);
+ }
+ if (txvq->packed_desc[desc_current].flags & VRING_DESC_F_NEXT)
+ t->virtio_ring_flags |= 1 << VIRTIO_TRACE_F_SIMPLE_CHAINED;
+
+ if (!(txvq->packed_desc[desc_current].flags & VRING_DESC_F_NEXT) &&
+ !(txvq->packed_desc[desc_current].flags & VRING_DESC_F_INDIRECT))
+ t->virtio_ring_flags |= 1 << VIRTIO_TRACE_F_SINGLE_DESC;
+
+ t->first_desc_len = hdr_desc ? hdr_desc->len : 0;
+
+ if (!hdr_desc || !(hdr = map_guest_mem (vui, hdr_desc->addr, &hint)))
+ t->virtio_ring_flags |= 1 << VIRTIO_TRACE_F_MAP_ERROR;
+ else
+ {
+ u32 len = vui->virtio_net_hdr_sz;
+ clib_memcpy_fast (&t->hdr, hdr,
+ len > hdr_desc->len ? hdr_desc->len : len);
+ }
+}
+
+static_always_inline u32
+vhost_user_rx_discard_packet_packed (vlib_main_t * vm,
+ vhost_user_intf_t * vui,
+ vhost_user_vring_t * txvq,
+ u32 discard_max)
+{
+ u32 discarded_packets = 0;
+ u16 mask = txvq->qsz_mask;
+ u16 desc_current, desc_head;
+
+ desc_head = desc_current = txvq->last_used_idx & mask;
+
+ /*
+ * On the RX side, each packet corresponds to one descriptor
+ * (it is the same whether it is a shallow descriptor, chained, or indirect).
+ * Therefore, discarding a packet is like discarding a descriptor.
+ */
+ while ((discarded_packets != discard_max) &&
+ vhost_user_packed_desc_available (txvq, desc_current))
+ {
+ vhost_user_advance_last_avail_idx (txvq);
+ discarded_packets++;
+ desc_current = (desc_current + 1) & mask;
+ }
+
+ if (PREDICT_TRUE (discarded_packets))
+ vhost_user_mark_desc_consumed (vui, txvq, desc_head, discarded_packets);
+ return (discarded_packets);
+}
+
+static_always_inline u32
+vhost_user_input_copy_packed (vhost_user_intf_t * vui, vhost_copy_t * cpy,
+ u16 copy_len, u32 * map_hint)
+{
+ void *src0, *src1, *src2, *src3, *src4, *src5, *src6, *src7;
+ u8 bad;
+ u32 rc = VHOST_USER_INPUT_FUNC_ERROR_NO_ERROR;
+
+ if (PREDICT_TRUE (copy_len >= 8))
+ {
+ src4 = map_guest_mem (vui, cpy[0].src, map_hint);
+ src5 = map_guest_mem (vui, cpy[1].src, map_hint);
+ src6 = map_guest_mem (vui, cpy[2].src, map_hint);
+ src7 = map_guest_mem (vui, cpy[3].src, map_hint);
+ bad = (src4 == 0) + (src5 == 0) + (src6 == 0) + (src7 == 0);
+ if (PREDICT_FALSE (bad))
+ goto one_by_one;
+ CLIB_PREFETCH (src4, 64, LOAD);
+ CLIB_PREFETCH (src5, 64, LOAD);
+ CLIB_PREFETCH (src6, 64, LOAD);
+ CLIB_PREFETCH (src7, 64, LOAD);
+
+ while (PREDICT_TRUE (copy_len >= 8))
+ {
+ src0 = src4;
+ src1 = src5;
+ src2 = src6;
+ src3 = src7;
+
+ src4 = map_guest_mem (vui, cpy[4].src, map_hint);
+ src5 = map_guest_mem (vui, cpy[5].src, map_hint);
+ src6 = map_guest_mem (vui, cpy[6].src, map_hint);
+ src7 = map_guest_mem (vui, cpy[7].src, map_hint);
+ bad = (src4 == 0) + (src5 == 0) + (src6 == 0) + (src7 == 0);
+ if (PREDICT_FALSE (bad))
+ break;
+
+ CLIB_PREFETCH (src4, 64, LOAD);
+ CLIB_PREFETCH (src5, 64, LOAD);
+ CLIB_PREFETCH (src6, 64, LOAD);
+ CLIB_PREFETCH (src7, 64, LOAD);
+
+ clib_memcpy_fast ((void *) cpy[0].dst, src0, cpy[0].len);
+ clib_memcpy_fast ((void *) cpy[1].dst, src1, cpy[1].len);
+ clib_memcpy_fast ((void *) cpy[2].dst, src2, cpy[2].len);
+ clib_memcpy_fast ((void *) cpy[3].dst, src3, cpy[3].len);
+ copy_len -= 4;
+ cpy += 4;
+ }
+ }
+
+one_by_one:
+ while (copy_len)
+ {
+ if (PREDICT_FALSE (!(src0 = map_guest_mem (vui, cpy->src, map_hint))))
+ {
+ rc = VHOST_USER_INPUT_FUNC_ERROR_MMAP_FAIL;
+ break;
+ }
+ clib_memcpy_fast ((void *) cpy->dst, src0, cpy->len);
+ copy_len -= 1;
+ cpy += 1;
+ }
+ return rc;
+}
+
+static_always_inline u32
+vhost_user_do_offload (vhost_user_intf_t * vui,
+ vring_packed_desc_t * desc_table, u16 desc_current,
+ u16 mask, vlib_buffer_t * b_head, u32 * map_hint)
+{
+ u32 rc = VHOST_USER_INPUT_FUNC_ERROR_NO_ERROR;
+ virtio_net_hdr_mrg_rxbuf_t *hdr;
+ u8 *b_data;
+ u32 desc_data_offset = vui->virtio_net_hdr_sz;
+
+ hdr = map_guest_mem (vui, desc_table[desc_current].addr, map_hint);
+ if (PREDICT_FALSE (hdr == 0))
+ rc = VHOST_USER_INPUT_FUNC_ERROR_MMAP_FAIL;
+ else if (hdr->hdr.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM)
+ {
+ if (desc_data_offset == desc_table[desc_current].len)
+ {
+ desc_current = (desc_current + 1) & mask;
+ b_data =
+ map_guest_mem (vui, desc_table[desc_current].addr, map_hint);
+ if (PREDICT_FALSE (b_data == 0))
+ rc = VHOST_USER_INPUT_FUNC_ERROR_MMAP_FAIL;
+ else
+ vhost_user_handle_rx_offload (b_head, b_data, &hdr->hdr);
+ }
+ else
+ {
+ b_data = (u8 *) hdr + desc_data_offset;
+ vhost_user_handle_rx_offload (b_head, b_data, &hdr->hdr);
+ }
+ }
+
+ return rc;
+}
+
+static_always_inline u32
+vhost_user_compute_buffers_required (u32 desc_len, u32 buffer_data_size)
+{
+ div_t result;
+ u32 buffers_required;
+
+ if (PREDICT_TRUE (buffer_data_size == 2048))
+ {
+ buffers_required = desc_len >> 11;
+ if ((desc_len & 2047) != 0)
+ buffers_required++;
+ return (buffers_required);
+ }
+
+ if (desc_len < buffer_data_size)
+ return 1;
+
+ result = div (desc_len, buffer_data_size);
+ if (result.rem)
+ buffers_required = result.quot + 1;
+ else
+ buffers_required = result.quot;
+
+ return (buffers_required);
+}
+
+static_always_inline u32
+vhost_user_compute_indirect_desc_len (vhost_user_intf_t * vui,
+ vhost_user_vring_t * txvq,
+ u32 buffer_data_size, u16 desc_current,
+ u32 * map_hint)
+{
+ vring_packed_desc_t *desc_table = txvq->packed_desc;
+ u32 desc_len = 0;
+ u16 desc_data_offset = vui->virtio_net_hdr_sz;
+ u16 desc_idx = desc_current;
+ u32 n_descs;
+
+ n_descs = desc_table[desc_idx].len >> 4;
+ desc_table = map_guest_mem (vui, desc_table[desc_idx].addr, map_hint);
+ if (PREDICT_FALSE (desc_table == 0))
+ return 0;
+
+ for (desc_idx = 0; desc_idx < n_descs; desc_idx++)
+ desc_len += desc_table[desc_idx].len;
+
+ if (PREDICT_TRUE (desc_len > desc_data_offset))
+ desc_len -= desc_data_offset;
+
+ return vhost_user_compute_buffers_required (desc_len, buffer_data_size);
+}
+
+static_always_inline u32
+vhost_user_compute_chained_desc_len (vhost_user_intf_t * vui,
+ vhost_user_vring_t * txvq,
+ u32 buffer_data_size, u16 * current,
+ u16 * n_left)
+{
+ vring_packed_desc_t *desc_table = txvq->packed_desc;
+ u32 desc_len = 0;
+ u16 mask = txvq->qsz_mask;
+
+ while (desc_table[*current].flags & VRING_DESC_F_NEXT)
+ {
+ desc_len += desc_table[*current].len;
+ (*n_left)++;
+ *current = (*current + 1) & mask;
+ vhost_user_advance_last_avail_idx (txvq);
+ }
+ desc_len += desc_table[*current].len;
+ (*n_left)++;
+ *current = (*current + 1) & mask;
+ vhost_user_advance_last_avail_idx (txvq);
+
+ if (PREDICT_TRUE (desc_len > vui->virtio_net_hdr_sz))
+ desc_len -= vui->virtio_net_hdr_sz;
+
+ return vhost_user_compute_buffers_required (desc_len, buffer_data_size);
+}
+
+static_always_inline void
+vhost_user_assemble_packet (vring_packed_desc_t * desc_table,
+ u16 * desc_idx, vlib_buffer_t * b_head,
+ vlib_buffer_t ** b_current, u32 ** next,
+ vlib_buffer_t *** b, u32 * bi_current,
+ vhost_cpu_t * cpu, u16 * copy_len,
+ u32 * buffers_used, u32 buffers_required,
+ u32 * desc_data_offset, u32 buffer_data_size,
+ u16 mask)
+{
+ u32 desc_data_l;
+
+ while (*desc_data_offset < desc_table[*desc_idx].len)
+ {
+ /* Get more output if necessary. Or end of packet. */
+ if (PREDICT_FALSE ((*b_current)->current_length == buffer_data_size))
+ {
+ /* Get next output */
+ u32 bi_next = **next;
+ (*next)++;
+ (*b_current)->next_buffer = bi_next;
+ (*b_current)->flags |= VLIB_BUFFER_NEXT_PRESENT;
+ *bi_current = bi_next;
+ *b_current = **b;
+ (*b)++;
+ (*buffers_used)++;
+ ASSERT (*buffers_used <= buffers_required);
+ }
+
+ /* Prepare a copy order executed later for the data */
+ ASSERT (*copy_len < VHOST_USER_COPY_ARRAY_N);
+ vhost_copy_t *cpy = &cpu->copy[*copy_len];
+ (*copy_len)++;
+ desc_data_l = desc_table[*desc_idx].len - *desc_data_offset;
+ cpy->len = buffer_data_size - (*b_current)->current_length;
+ cpy->len = (cpy->len > desc_data_l) ? desc_data_l : cpy->len;
+ cpy->dst = (uword) (vlib_buffer_get_current (*b_current) +
+ (*b_current)->current_length);
+ cpy->src = desc_table[*desc_idx].addr + *desc_data_offset;
+
+ *desc_data_offset += cpy->len;
+
+ (*b_current)->current_length += cpy->len;
+ b_head->total_length_not_including_first_buffer += cpy->len;
+ }
+ *desc_idx = (*desc_idx + 1) & mask;;
+ *desc_data_offset = 0;
+}
+
+static_always_inline u32
+vhost_user_if_input_packed (vlib_main_t * vm, vhost_user_main_t * vum,
+ vhost_user_intf_t * vui, u16 qid,
+ vlib_node_runtime_t * node,
+ vnet_hw_if_rx_mode mode, u8 enable_csum)
+{
+ vhost_user_vring_t *txvq = &vui->vrings[VHOST_VRING_IDX_TX (qid)];
+ vnet_feature_main_t *fm = &feature_main;
+ u8 feature_arc_idx = fm->device_input_feature_arc_index;
+ u16 n_rx_packets = 0;
+ u32 n_rx_bytes = 0;
+ u16 n_left = 0;
+ u32 buffers_required = 0;
+ u32 n_left_to_next, *to_next;
+ u32 next_index = VNET_DEVICE_INPUT_NEXT_ETHERNET_INPUT;
+ u32 n_trace = vlib_get_trace_count (vm, node);
+ u32 buffer_data_size = vlib_buffer_get_default_data_size (vm);
+ u32 map_hint = 0;
+ vhost_cpu_t *cpu = &vum->cpus[vm->thread_index];
+ u16 copy_len = 0;
+ u32 current_config_index = ~0;
+ u16 mask = txvq->qsz_mask;
+ u16 desc_current, desc_head, last_used_idx;
+ vring_packed_desc_t *desc_table = 0;
+ u32 n_descs_processed = 0;
+ u32 rv;
+ vlib_buffer_t **b;
+ u32 *next;
+ u32 buffers_used = 0;
+ u16 current, n_descs_to_process;
+
+ /* The descriptor table is not ready yet */
+ if (PREDICT_FALSE (txvq->packed_desc == 0))
+ goto done;
+
+ /* do we have pending interrupts ? */
+ vhost_user_vring_t *rxvq = &vui->vrings[VHOST_VRING_IDX_RX (qid)];
+ vhost_user_input_do_interrupt (vm, vui, txvq, rxvq);
+
+ /*
+ * For adaptive mode, it is optimized to reduce interrupts.
+ * If the scheduler switches the input node to polling due
+ * to burst of traffic, we tell the driver no interrupt.
+ * When the traffic subsides, the scheduler switches the node back to
+ * interrupt mode. We must tell the driver we want interrupt.
+ */
+ if (PREDICT_FALSE (mode == VNET_HW_IF_RX_MODE_ADAPTIVE))
+ {
+ if ((node->flags &
+ VLIB_NODE_FLAG_SWITCH_FROM_POLLING_TO_INTERRUPT_MODE) ||
+ !(node->flags &
+ VLIB_NODE_FLAG_SWITCH_FROM_INTERRUPT_TO_POLLING_MODE))
+ /* Tell driver we want notification */
+ txvq->used_event->flags = 0;
+ else
+ /* Tell driver we don't want notification */
+ txvq->used_event->flags = VRING_EVENT_F_DISABLE;
+ }
+
+ last_used_idx = txvq->last_used_idx & mask;
+ desc_head = desc_current = last_used_idx;
+
+ if (vhost_user_packed_desc_available (txvq, desc_current) == 0)
+ goto done;
+
+ if (PREDICT_FALSE (!vui->admin_up || !vui->is_ready || !(txvq->enabled)))
+ {
+ /*
+ * Discard input packet if interface is admin down or vring is not
+ * enabled.
+ * "For example, for a networking device, in the disabled state
+ * client must not supply any new RX packets, but must process
+ * and discard any TX packets."
+ */
+ rv = vhost_user_rx_discard_packet_packed (vm, vui, txvq,
+ VHOST_USER_DOWN_DISCARD_COUNT);
+ vlib_error_count (vm, vhost_user_input_node.index,
+ VHOST_USER_INPUT_FUNC_ERROR_NOT_READY, rv);
+ goto done;
+ }
+
+ vhost_user_input_setup_frame (vm, node, vui, ¤t_config_index,
+ &next_index, &to_next, &n_left_to_next);
+
+ /*
+ * Compute n_left and total buffers needed
+ */
+ desc_table = txvq->packed_desc;
+ current = desc_current;
+ while (vhost_user_packed_desc_available (txvq, current) &&
+ (n_left < VLIB_FRAME_SIZE))
+ {
+ if (desc_table[current].flags & VRING_DESC_F_INDIRECT)
+ {
+ buffers_required +=
+ vhost_user_compute_indirect_desc_len (vui, txvq, buffer_data_size,
+ current, &map_hint);
+ n_left++;
+ current = (current + 1) & mask;
+ vhost_user_advance_last_avail_idx (txvq);
+ }
+ else
+ {
+ buffers_required +=
+ vhost_user_compute_chained_desc_len (vui, txvq, buffer_data_size,
+ ¤t, &n_left);
+ }
+ }
+
+ /* Something is broken if we need more than 10000 buffers */
+ if (PREDICT_FALSE ((buffers_required == 0) || (buffers_required > 10000)))
+ {
+ rv = vhost_user_rx_discard_packet_packed (vm, vui, txvq, n_left);
+ vlib_error_count (vm, vhost_user_input_node.index,
+ VHOST_USER_INPUT_FUNC_ERROR_NO_BUFFER, rv);
+ goto done;
+ }
+
+ vec_validate (cpu->to_next_list, buffers_required);
+ rv = vlib_buffer_alloc (vm, cpu->to_next_list, buffers_required);
+ if (PREDICT_FALSE (rv != buffers_required))
+ {
+ vlib_buffer_free (vm, cpu->to_next_list, rv);
+ rv = vhost_user_rx_discard_packet_packed (vm, vui, txvq, n_left);
+ vlib_error_count (vm, vhost_user_input_node.index,
+ VHOST_USER_INPUT_FUNC_ERROR_NO_BUFFER, rv);
+ goto done;
+ }
+
+ next = cpu->to_next_list;
+ vec_validate (cpu->rx_buffers_pdesc, buffers_required);
+ vlib_get_buffers (vm, next, cpu->rx_buffers_pdesc, buffers_required);
+ b = cpu->rx_buffers_pdesc;
+ n_descs_processed = n_left;
+
+ while (n_left)
+ {
+ vlib_buffer_t *b_head, *b_current;
+ u32 bi_current;
+ u32 desc_data_offset;
+ u16 desc_idx = desc_current;
+ u32 n_descs;
+
+ desc_table = txvq->packed_desc;
+ to_next[0] = bi_current = next[0];
+ b_head = b_current = b[0];
+ b++;
+ buffers_used++;
+ ASSERT (buffers_used <= buffers_required);
+ to_next++;
+ next++;
+ n_left_to_next--;
+
+ /* The buffer should already be initialized */
+ b_head->total_length_not_including_first_buffer = 0;
+ b_head->flags |= VLIB_BUFFER_TOTAL_LENGTH_VALID;
+ desc_data_offset = vui->virtio_net_hdr_sz;
+ n_descs_to_process = 1;
+
+ if (desc_table[desc_idx].flags & VRING_DESC_F_INDIRECT)
+ {
+ n_descs = desc_table[desc_idx].len >> 4;
+ desc_table = map_guest_mem (vui, desc_table[desc_idx].addr,
+ &map_hint);
+ desc_idx = 0;
+ if (PREDICT_FALSE (desc_table == 0) ||
+ (enable_csum &&
+ (PREDICT_FALSE
+ (vhost_user_do_offload
+ (vui, desc_table, desc_idx, mask, b_head,
+ &map_hint) != VHOST_USER_INPUT_FUNC_ERROR_NO_ERROR))))
+ {
+ vlib_error_count (vm, node->node_index,
+ VHOST_USER_INPUT_FUNC_ERROR_MMAP_FAIL, 1);
+ to_next--;
+ next--;
+ n_left_to_next++;
+ buffers_used--;
+ b--;
+ goto out;
+ }
+ while (n_descs)
+ {
+ vhost_user_assemble_packet (desc_table, &desc_idx, b_head,
+ &b_current, &next, &b, &bi_current,
+ cpu, ©_len, &buffers_used,
+ buffers_required, &desc_data_offset,
+ buffer_data_size, mask);
+ n_descs--;
+ }
+ }
+ else
+ {
+ if (enable_csum)
+ {
+ rv = vhost_user_do_offload (vui, desc_table, desc_idx, mask,
+ b_head, &map_hint);
+ if (PREDICT_FALSE (rv != VHOST_USER_INPUT_FUNC_ERROR_NO_ERROR))
+ {
+ vlib_error_count (vm, node->node_index, rv, 1);
+ to_next--;
+ next--;
+ n_left_to_next++;
+ buffers_used--;
+ b--;
+ goto out;
+ }
+ }
+ /*
+ * For chained descriptor, we process all chains in a single while
+ * loop. So count how many descriptors in the chain.
+ */
+ n_descs_to_process = 1;
+ while (desc_table[desc_idx].flags & VRING_DESC_F_NEXT)
+ {
+ vhost_user_assemble_packet (desc_table, &desc_idx, b_head,
+ &b_current, &next, &b, &bi_current,
+ cpu, ©_len, &buffers_used,
+ buffers_required, &desc_data_offset,
+ buffer_data_size, mask);
+ n_descs_to_process++;
+ }
+ vhost_user_assemble_packet (desc_table, &desc_idx, b_head,
+ &b_current, &next, &b, &bi_current,
+ cpu, ©_len, &buffers_used,
+ buffers_required, &desc_data_offset,
+ buffer_data_size, mask);
+ }
+
+ n_rx_bytes += b_head->total_length_not_including_first_buffer;
+ n_rx_packets++;
+
+ b_head->total_length_not_including_first_buffer -=
+ b_head->current_length;
+
+ VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b_head);
+
+ vnet_buffer (b_head)->sw_if_index[VLIB_RX] = vui->sw_if_index;
+ vnet_buffer (b_head)->sw_if_index[VLIB_TX] = ~0;
+ b_head->error = 0;
+
+ if (current_config_index != ~0)
+ {
+ b_head->current_config_index = current_config_index;
+ vnet_buffer (b_head)->feature_arc_index = feature_arc_idx;
+ }
+
+ out:
+ ASSERT (n_left >= n_descs_to_process);
+ n_left -= n_descs_to_process;
+
+ /* advance to next descrptor */
+ desc_current = (desc_current + n_descs_to_process) & mask;
+
+ /*
+ * Although separating memory copies from virtio ring parsing
+ * is beneficial, we can offer to perform the copies from time
+ * to time in order to free some space in the ring.
+ */
+ if (PREDICT_FALSE (copy_len >= VHOST_USER_RX_COPY_THRESHOLD))
+ {
+ rv = vhost_user_input_copy_packed (vui, cpu->copy, copy_len,
+ &map_hint);
+ if (PREDICT_FALSE (rv != VHOST_USER_INPUT_FUNC_ERROR_NO_ERROR))
+ vlib_error_count (vm, node->node_index, rv, 1);
+ copy_len = 0;
+ }
+ }
+ vlib_put_next_frame (vm, node, next_index, n_left_to_next);
+
+ /* Do the memory copies */
+ rv = vhost_user_input_copy_packed (vui, cpu->copy, copy_len, &map_hint);
+ if (PREDICT_FALSE (rv != VHOST_USER_INPUT_FUNC_ERROR_NO_ERROR))
+ vlib_error_count (vm, node->node_index, rv, 1);
+
+ /* Must do the tracing before giving buffers back to driver */
+ if (PREDICT_FALSE (n_trace))
+ {
+ u32 left = n_rx_packets;
+
+ b = cpu->rx_buffers_pdesc;
+ while (n_trace && left)
+ {
+ if (PREDICT_TRUE
+ (vlib_trace_buffer
+ (vm, node, next_index, b[0], /* follow_chain */ 0)))
+ {
+ vhost_trace_t *t0;
+ t0 = vlib_add_trace (vm, node, b[0], sizeof (t0[0]));
+ vhost_user_rx_trace_packed (t0, vui, qid, txvq, last_used_idx);
+ last_used_idx = (last_used_idx + 1) & mask;
+ n_trace--;
+ vlib_set_trace_count (vm, node, n_trace);
+ }
+ left--;
+ b++;
+ }
+ }
+
+ /*
+ * Give buffers back to driver.
+ */
+ vhost_user_mark_desc_consumed (vui, txvq, desc_head, n_descs_processed);
+
+ /* interrupt (call) handling */
+ if ((txvq->callfd_idx != ~0) &&
+ (txvq->avail_event->flags != VRING_EVENT_F_DISABLE))
+ {
+ txvq->n_since_last_int += n_rx_packets;
+ if (txvq->n_since_last_int > vum->coalesce_frames)
+ vhost_user_send_call (vm, vui, txvq);
+ }
+
+ /* increase rx counters */
+ vlib_increment_combined_counter
+ (vnet_main.interface_main.combined_sw_if_counters
+ + VNET_INTERFACE_COUNTER_RX, vm->thread_index, vui->sw_if_index,
+ n_rx_packets, n_rx_bytes);
+
+ vnet_device_increment_rx_packets (vm->thread_index, n_rx_packets);
+
+ if (PREDICT_FALSE (buffers_used < buffers_required))
+ vlib_buffer_free (vm, next, buffers_required - buffers_used);
+
+done:
+ return n_rx_packets;
+}
+
VLIB_NODE_FN (vhost_user_input_node) (vlib_main_t * vm,
vlib_node_runtime_t * node,
vlib_frame_t * frame)
{
vui =
pool_elt_at_index (vum->vhost_user_interfaces, dq->dev_instance);
- n_rx_packets += vhost_user_if_input (vm, vum, vui, dq->queue_id, node,
- dq->mode);
+ if (vhost_user_is_packed_ring_supported (vui))
+ {
+ if (vui->features & VIRTIO_FEATURE (VIRTIO_NET_F_CSUM))
+ n_rx_packets += vhost_user_if_input_packed (vm, vum, vui,
+ dq->queue_id, node,
+ dq->mode, 1);
+ else
+ n_rx_packets += vhost_user_if_input_packed (vm, vum, vui,
+ dq->queue_id, node,
+ dq->mode, 0);
+ }
+ else
+ {
+ if (vui->features & VIRTIO_FEATURE (VIRTIO_NET_F_CSUM))
+ n_rx_packets += vhost_user_if_input (vm, vum, vui, dq->queue_id,
+ node, dq->mode, 1);
+ else
+ n_rx_packets += vhost_user_if_input (vm, vum, vui, dq->queue_id,
+ node, dq->mode, 0);
+ }
}
}
.type = VLIB_NODE_TYPE_INPUT,
.name = "vhost-user-input",
.sibling_of = "device-input",
+ .flags = VLIB_NODE_FLAG_TRACE_SUPPORTED,
/* Will be enabled if/when hardware is detected. */
.state = VLIB_NODE_STATE_DISABLED,
Code Review / vpp.git / blobdiff