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 <vppinfra/ring.h>
22 #include <vnet/ethernet/ethernet.h>
23 #include <vnet/devices/devices.h>
27 static_always_inline u8
28 avf_tx_desc_get_dtyp (avf_tx_desc_t * d)
30 return d->qword[1] & 0x0f;
33 static_always_inline u16
34 avf_tx_enqueue (vlib_main_t * vm, avf_txq_t * txq, u32 * buffers,
35 u32 n_packets, int use_va_dma)
38 u64 bits = AVF_TXD_CMD_EOP | AVF_TXD_CMD_RSV;
40 u16 *slot, n_desc_left, n_packets_left = n_packets;
41 u16 mask = txq->size - 1;
43 avf_tx_desc_t *d = txq->descs + next;
46 n_desc_left = txq->size - clib_max (txq->next, txq->n_enqueued + 8);
51 while (n_packets_left && n_desc_left)
54 if (n_packets_left < 8 || n_desc_left < 4)
57 vlib_prefetch_buffer_with_index (vm, buffers[4], LOAD);
58 vlib_prefetch_buffer_with_index (vm, buffers[5], LOAD);
59 vlib_prefetch_buffer_with_index (vm, buffers[6], LOAD);
60 vlib_prefetch_buffer_with_index (vm, buffers[7], LOAD);
62 b[0] = vlib_get_buffer (vm, buffers[0]);
63 b[1] = vlib_get_buffer (vm, buffers[1]);
64 b[2] = vlib_get_buffer (vm, buffers[2]);
65 b[3] = vlib_get_buffer (vm, buffers[3]);
67 or_flags = b[0]->flags | b[1]->flags | b[2]->flags | b[3]->flags;
69 if (or_flags & VLIB_BUFFER_NEXT_PRESENT)
72 vlib_buffer_copy_indices (txq->bufs + next, buffers, 4);
76 d[0].qword[0] = vlib_buffer_get_current_va (b[0]);
77 d[1].qword[0] = vlib_buffer_get_current_va (b[1]);
78 d[2].qword[0] = vlib_buffer_get_current_va (b[2]);
79 d[3].qword[0] = vlib_buffer_get_current_va (b[3]);
83 d[0].qword[0] = vlib_buffer_get_current_pa (vm, b[0]);
84 d[1].qword[0] = vlib_buffer_get_current_pa (vm, b[1]);
85 d[2].qword[0] = vlib_buffer_get_current_pa (vm, b[2]);
86 d[3].qword[0] = vlib_buffer_get_current_pa (vm, b[3]);
89 d[0].qword[1] = ((u64) b[0]->current_length) << 34 | bits;
90 d[1].qword[1] = ((u64) b[1]->current_length) << 34 | bits;
91 d[2].qword[1] = ((u64) b[2]->current_length) << 34 | bits;
92 d[3].qword[1] = ((u64) b[3]->current_length) << 34 | bits;
103 txq->bufs[next] = buffers[0];
104 b[0] = vlib_get_buffer (vm, buffers[0]);
107 d[0].qword[0] = vlib_buffer_get_current_va (b[0]);
109 d[0].qword[0] = vlib_buffer_get_current_pa (vm, b[0]);
111 d[0].qword[1] = (((u64) b[0]->current_length) << 34) | bits;
121 if ((slot = clib_ring_enq (txq->rs_slots)))
123 u16 rs_slot = slot[0] = (next - 1) & mask;
124 d = txq->descs + rs_slot;
125 d[0].qword[1] |= AVF_TXD_CMD_RS;
128 CLIB_MEMORY_BARRIER ();
129 *(txq->qtx_tail) = txq->next = next & mask;
130 txq->n_enqueued += n_desc;
131 return n_packets - n_packets_left;
134 VNET_DEVICE_CLASS_TX_FN (avf_device_class) (vlib_main_t * vm,
135 vlib_node_runtime_t * node,
136 vlib_frame_t * frame)
138 avf_main_t *am = &avf_main;
139 vnet_interface_output_runtime_t *rd = (void *) node->runtime_data;
140 avf_device_t *ad = pool_elt_at_index (am->devices, rd->dev_instance);
141 u32 thread_index = vm->thread_index;
142 u8 qid = thread_index;
143 avf_txq_t *txq = vec_elt_at_index (ad->txqs, qid % ad->num_queue_pairs);
144 u32 *buffers = vlib_frame_vector_args (frame);
148 clib_spinlock_lock_if_init (&txq->lock);
150 n_left = frame->n_vectors;
153 /* release consumed bufs */
156 i32 complete_slot = -1;
159 u16 *slot = clib_ring_get_first (txq->rs_slots);
164 if (avf_tx_desc_get_dtyp (txq->descs + slot[0]) != 0x0F)
167 complete_slot = slot[0];
169 clib_ring_deq (txq->rs_slots);
172 if (complete_slot >= 0)
174 u16 first, mask, n_free;
175 mask = txq->size - 1;
176 first = (txq->next - txq->n_enqueued) & mask;
177 n_free = (complete_slot + 1 - first) & mask;
179 txq->n_enqueued -= n_free;
180 vlib_buffer_free_from_ring (vm, txq->bufs, first, txq->size,
185 if (ad->flags & AVF_DEVICE_F_VA_DMA)
186 n_enq = avf_tx_enqueue (vm, txq, buffers, n_left, 1);
188 n_enq = avf_tx_enqueue (vm, txq, buffers, n_left, 0);
199 vlib_buffer_free (vm, buffers, n_left);
200 vlib_error_count (vm, node->node_index,
201 AVF_TX_ERROR_NO_FREE_SLOTS, n_left);
204 clib_spinlock_unlock_if_init (&txq->lock);
206 return frame->n_vectors - n_left;
210 * fd.io coding-style-patch-verification: ON
213 * eval: (c-set-style "gnu")