2 *------------------------------------------------------------------
3 * Copyright (c) 2018 Cisco and/or its affiliates.
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at:
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 *------------------------------------------------------------------
18 #include <vlib/vlib.h>
19 #include <vlib/unix/unix.h>
20 #include <vlib/pci/pci.h>
21 #include <vnet/ethernet/ethernet.h>
22 #include <vnet/devices/devices.h>
26 static_always_inline u8
27 avf_tx_desc_get_dtyp (avf_tx_desc_t * d)
29 return d->qword[1] & 0x0f;
32 static_always_inline u16
33 avf_tx_enqueue (vlib_main_t * vm, avf_txq_t * txq, u32 * buffers,
34 u32 n_packets, int use_va_dma)
37 u64 bits = (AVF_TXD_CMD_EOP | AVF_TXD_CMD_RS | AVF_TXD_CMD_RSV);
39 u16 n_desc_left, n_packets_left = n_packets;
40 u16 mask = txq->size - 1;
42 avf_tx_desc_t *d = txq->descs + next;
45 n_desc_left = txq->size - clib_max (txq->next, txq->n_enqueued + 8);
47 while (n_packets_left && n_desc_left)
50 if (n_packets_left < 8 || n_desc_left < 4)
53 vlib_prefetch_buffer_with_index (vm, buffers[4], LOAD);
54 vlib_prefetch_buffer_with_index (vm, buffers[5], LOAD);
55 vlib_prefetch_buffer_with_index (vm, buffers[6], LOAD);
56 vlib_prefetch_buffer_with_index (vm, buffers[7], LOAD);
58 b[0] = vlib_get_buffer (vm, buffers[0]);
59 b[1] = vlib_get_buffer (vm, buffers[1]);
60 b[2] = vlib_get_buffer (vm, buffers[2]);
61 b[3] = vlib_get_buffer (vm, buffers[3]);
63 or_flags = b[0]->flags | b[1]->flags | b[2]->flags | b[3]->flags;
65 if (or_flags & VLIB_BUFFER_NEXT_PRESENT)
68 clib_memcpy_fast (txq->bufs + next, buffers, sizeof (u32) * 4);
72 d[0].qword[0] = vlib_buffer_get_current_va (b[0]);
73 d[1].qword[0] = vlib_buffer_get_current_va (b[1]);
74 d[2].qword[0] = vlib_buffer_get_current_va (b[2]);
75 d[3].qword[0] = vlib_buffer_get_current_va (b[3]);
79 d[0].qword[0] = vlib_buffer_get_current_pa (vm, b[0]);
80 d[1].qword[0] = vlib_buffer_get_current_pa (vm, b[1]);
81 d[2].qword[0] = vlib_buffer_get_current_pa (vm, b[2]);
82 d[3].qword[0] = vlib_buffer_get_current_pa (vm, b[3]);
85 d[0].qword[1] = ((u64) b[0]->current_length) << 34 | bits;
86 d[1].qword[1] = ((u64) b[1]->current_length) << 34 | bits;
87 d[2].qword[1] = ((u64) b[2]->current_length) << 34 | bits;
88 d[3].qword[1] = ((u64) b[3]->current_length) << 34 | bits;
99 txq->bufs[next] = buffers[0];
100 b[0] = vlib_get_buffer (vm, buffers[0]);
103 d[0].qword[0] = vlib_buffer_get_current_va (b[0]);
105 d[0].qword[0] = vlib_buffer_get_current_pa (vm, b[0]);
107 d[0].qword[1] = (((u64) b[0]->current_length) << 34) | bits;
117 CLIB_MEMORY_BARRIER ();
118 *(txq->qtx_tail) = txq->next = next & mask;
119 txq->n_enqueued += n_desc;
120 return n_packets - n_packets_left;
123 VNET_DEVICE_CLASS_TX_FN (avf_device_class) (vlib_main_t * vm,
124 vlib_node_runtime_t * node,
125 vlib_frame_t * frame)
127 avf_main_t *am = &avf_main;
128 vnet_interface_output_runtime_t *rd = (void *) node->runtime_data;
129 avf_device_t *ad = pool_elt_at_index (am->devices, rd->dev_instance);
130 u32 thread_index = vm->thread_index;
131 u8 qid = thread_index;
132 avf_txq_t *txq = vec_elt_at_index (ad->txqs, qid % ad->num_queue_pairs);
133 u32 *buffers = vlib_frame_vector_args (frame);
137 clib_spinlock_lock_if_init (&txq->lock);
139 n_left = frame->n_vectors;
142 /* release consumed bufs */
146 u16 first, slot, n_free = 0, mask = txq->size - 1;
147 first = slot = (txq->next - txq->n_enqueued) & mask;
148 d0 = txq->descs + slot;
149 while (n_free < txq->n_enqueued && avf_tx_desc_get_dtyp (d0) == 0x0F)
152 slot = (slot + 1) & mask;
153 d0 = txq->descs + slot;
158 txq->n_enqueued -= n_free;
159 vlib_buffer_free_from_ring (vm, txq->bufs, first, txq->size,
164 if (ad->flags & AVF_DEVICE_F_VA_DMA)
165 n_enq = avf_tx_enqueue (vm, txq, buffers, n_left, 1);
167 n_enq = avf_tx_enqueue (vm, txq, buffers, n_left, 0);
178 vlib_buffer_free (vm, buffers, n_left);
179 vlib_error_count (vm, node->node_index,
180 AVF_TX_ERROR_NO_FREE_SLOTS, n_left);
183 clib_spinlock_unlock_if_init (&txq->lock);
185 return frame->n_vectors - n_left;
189 * fd.io coding-style-patch-verification: ON
192 * eval: (c-set-style "gnu")