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>
24 #include <vmxnet3/vmxnet3.h>
26 static_always_inline void
27 vmxnet3_tx_comp_ring_advance_next (vmxnet3_txq_t * txq)
29 vmxnet3_tx_comp_ring *comp_ring = &txq->tx_comp_ring;
32 if (PREDICT_FALSE (comp_ring->next == txq->size))
35 comp_ring->gen ^= VMXNET3_TXCF_GEN;
39 static_always_inline void
40 vmxnet3_tx_ring_advance_produce (vmxnet3_txq_t * txq)
42 txq->tx_ring.produce++;
43 if (PREDICT_FALSE (txq->tx_ring.produce == txq->size))
45 txq->tx_ring.produce = 0;
46 txq->tx_ring.gen ^= VMXNET3_TXF_GEN;
50 static_always_inline void
51 vmxnet3_tx_ring_advance_consume (vmxnet3_txq_t * txq)
53 txq->tx_ring.consume++;
54 txq->tx_ring.consume &= txq->size - 1;
57 static_always_inline void
58 vmxnet3_txq_release (vlib_main_t * vm, vmxnet3_device_t * vd,
61 vmxnet3_tx_comp *tx_comp;
63 vmxnet3_tx_comp_ring *comp_ring;
64 u16 eop_idx, desc_idx;
66 comp_ring = &txq->tx_comp_ring;
67 tx_comp = &txq->tx_comp[comp_ring->next];
69 while ((tx_comp->flags & VMXNET3_TXCF_GEN) == comp_ring->gen)
71 eop_idx = tx_comp->index & VMXNET3_TXC_INDEX;
74 desc_idx = txq->tx_ring.consume;
75 bi0 = txq->tx_ring.bufs[desc_idx];
76 txq->tx_ring.bufs[desc_idx] = ~0;
77 vlib_buffer_free_no_next (vm, &bi0, 1);
78 vmxnet3_tx_ring_advance_consume (txq);
80 while (desc_idx != eop_idx);
82 vmxnet3_tx_comp_ring_advance_next (txq);
83 tx_comp = &txq->tx_comp[comp_ring->next];
87 static_always_inline u16
88 vmxnet3_tx_ring_space_left (vmxnet3_txq_t * txq)
92 count = (txq->tx_ring.consume - txq->tx_ring.produce - 1);
94 if (txq->tx_ring.produce >= txq->tx_ring.consume)
99 VNET_DEVICE_CLASS_TX_FN (vmxnet3_device_class) (vlib_main_t * vm,
100 vlib_node_runtime_t * node,
101 vlib_frame_t * frame)
103 vmxnet3_main_t *vmxm = &vmxnet3_main;
104 vnet_interface_output_runtime_t *rd = (void *) node->runtime_data;
105 vmxnet3_device_t *vd = pool_elt_at_index (vmxm->devices, rd->dev_instance);
106 u32 *buffers = vlib_frame_args (frame);
109 vmxnet3_tx_desc *txd = 0;
110 u32 desc_idx, generation, first_idx;
112 u16 n_left = frame->n_vectors;
114 u32 thread_index = vm->thread_index;
115 u16 qid = thread_index;
117 if (PREDICT_FALSE (!(vd->flags & VMXNET3_DEVICE_F_LINK_UP)))
119 vlib_buffer_free (vm, buffers, n_left);
120 vlib_error_count (vm, node->node_index, VMXNET3_TX_ERROR_LINK_DOWN,
125 txq = vec_elt_at_index (vd->txqs, qid % vd->num_tx_queues);
126 clib_spinlock_lock_if_init (&txq->lock);
128 vmxnet3_txq_release (vm, vd, txq);
132 u16 space_needed = 1, i;
136 b0 = vlib_get_buffer (vm, bi0);
139 space_left = vmxnet3_tx_ring_space_left (txq);
140 while (b->flags & VLIB_BUFFER_NEXT_PRESENT)
142 u32 next_buffer = b->next_buffer;
144 b = vlib_get_buffer (vm, next_buffer);
147 if (PREDICT_FALSE (space_left < space_needed))
149 vlib_buffer_free_one (vm, bi0);
150 vlib_error_count (vm, node->node_index,
151 VMXNET3_TX_ERROR_NO_FREE_SLOTS, 1);
155 * Drop this packet. But we may have enough room for the next packet
161 * Toggle the generation bit for SOP fragment to avoid device starts
162 * reading incomplete packet
164 generation = txq->tx_ring.gen ^ VMXNET3_TXF_GEN;
165 first_idx = txq->tx_ring.produce;
166 for (i = 0; i < space_needed; i++)
168 b0 = vlib_get_buffer (vm, bi0);
169 VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b0);
171 desc_idx = txq->tx_ring.produce;
173 vmxnet3_tx_ring_advance_produce (txq);
174 txq->tx_ring.bufs[desc_idx] = bi0;
176 txd = &txq->tx_desc[desc_idx];
178 vlib_get_buffer_data_physical_address (vm,
179 bi0) + b0->current_data;
181 txd->flags[0] = generation | b0->current_length;
183 generation = txq->tx_ring.gen;
186 bi0 = b0->next_buffer;
189 txd->flags[1] = VMXNET3_TXF_CQ | VMXNET3_TXF_EOP;
190 asm volatile ("":::"memory");
192 * Now toggle back the generation bit for the first segment.
193 * Device can start reading the packet
195 txq->tx_desc[first_idx].flags[0] ^= VMXNET3_TXF_GEN;
196 vmxnet3_reg_write (vd, 0, VMXNET3_REG_TXPROD, txq->tx_ring.produce);
202 clib_spinlock_unlock_if_init (&txq->lock);
204 return (frame->n_vectors - n_left);
208 * fd.io coding-style-patch-verification: ON
211 * eval: (c-set-style "gnu")