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>
23 #include <vnet/ethernet/ethernet.h>
24 #include <vnet/ip/ip4_packet.h>
25 #include <vnet/ip/ip6_packet.h>
26 #include <vnet/udp/udp_packet.h>
27 #include <vnet/tcp/tcp_packet.h>
29 #include <vnet/devices/devices.h>
33 static_always_inline u8
34 avf_tx_desc_get_dtyp (avf_tx_desc_t * d)
36 return d->qword[1] & 0x0f;
56 static_always_inline u64
57 avf_tx_prepare_cksum (vlib_buffer_t * b, u8 is_tso)
60 if (!is_tso && !(b->flags & ((VNET_BUFFER_F_OFFLOAD_IP_CKSUM |
61 VNET_BUFFER_F_OFFLOAD_TCP_CKSUM |
62 VNET_BUFFER_F_OFFLOAD_UDP_CKSUM))))
64 u32 is_tcp = is_tso || b->flags & VNET_BUFFER_F_OFFLOAD_TCP_CKSUM;
65 u32 is_udp = !is_tso && b->flags & VNET_BUFFER_F_OFFLOAD_UDP_CKSUM;
66 u32 is_ip4 = b->flags & VNET_BUFFER_F_IS_IP4;
67 u32 is_ip6 = b->flags & VNET_BUFFER_F_IS_IP6;
68 ASSERT (!is_tcp || !is_udp);
69 ASSERT (is_ip4 || is_ip6);
70 i16 l2_hdr_offset = vnet_buffer (b)->l2_hdr_offset;
71 i16 l3_hdr_offset = vnet_buffer (b)->l3_hdr_offset;
72 i16 l4_hdr_offset = vnet_buffer (b)->l4_hdr_offset;
73 u16 l2_len = l3_hdr_offset - l2_hdr_offset;
74 u16 l3_len = l4_hdr_offset - l3_hdr_offset;
75 ip4_header_t *ip4 = (void *) (b->data + l3_hdr_offset);
76 ip6_header_t *ip6 = (void *) (b->data + l3_hdr_offset);
77 tcp_header_t *tcp = (void *) (b->data + l4_hdr_offset);
78 udp_header_t *udp = (void *) (b->data + l4_hdr_offset);
80 is_tcp ? tcp_header_bytes (tcp) : is_udp ? sizeof (udp_header_t) : 0;
83 flags |= AVF_TXD_OFFSET_MACLEN (l2_len) |
84 AVF_TXD_OFFSET_IPLEN (l3_len) | AVF_TXD_OFFSET_L4LEN (l4_len);
85 flags |= is_ip4 ? AVF_TXD_CMD_IIPT_IPV4 : AVF_TXD_CMD_IIPT_IPV6;
86 flags |= is_tcp ? AVF_TXD_CMD_L4T_TCP : is_udp ? AVF_TXD_CMD_L4T_UDP : 0;
95 struct avf_ip4_psh psh = { 0 };
96 psh.src = ip4->src_address.as_u32;
97 psh.dst = ip4->dst_address.as_u32;
98 psh.proto = ip4->protocol;
101 clib_host_to_net_u16 (clib_net_to_host_u16 (ip4->length) -
102 (l4_hdr_offset - l3_hdr_offset));
103 sum = ~ip_csum (&psh, sizeof (psh));
107 struct avf_ip6_psh psh = { 0 };
108 clib_memcpy_fast (&psh.src, &ip6->src_address, 32);
109 psh.proto = clib_host_to_net_u32 ((u32) ip6->protocol);
110 psh.l4len = is_tso ? 0 : ip6->payload_length;
111 sum = ~ip_csum (&psh, sizeof (psh));
114 /* ip_csum does a byte swap for some reason... */
115 sum = clib_net_to_host_u16 (sum);
123 static_always_inline u16
124 avf_tx_enqueue (vlib_main_t * vm, vlib_node_runtime_t * node, avf_txq_t * txq,
125 u32 * buffers, u32 n_packets, int use_va_dma)
127 u16 next = txq->next;
128 u64 bits = AVF_TXD_CMD_EOP | AVF_TXD_CMD_RSV;
129 u64 one_by_one_offload_flags = 0;
131 u16 *slot, n_desc_left, n_packets_left = n_packets;
132 u16 mask = txq->size - 1;
134 avf_tx_desc_t *d = txq->descs + next;
138 /* avoid ring wrap */
139 n_desc_left = txq->size - clib_max (txq->next, txq->n_enqueued + 8);
141 if (n_desc_left == 0)
144 /* Fast path, no ring wrap */
145 while (n_packets_left && n_desc_left)
148 if (n_packets_left < 8 || n_desc_left < 4)
151 vlib_prefetch_buffer_with_index (vm, buffers[4], LOAD);
152 vlib_prefetch_buffer_with_index (vm, buffers[5], LOAD);
153 vlib_prefetch_buffer_with_index (vm, buffers[6], LOAD);
154 vlib_prefetch_buffer_with_index (vm, buffers[7], LOAD);
156 b[0] = vlib_get_buffer (vm, buffers[0]);
157 b[1] = vlib_get_buffer (vm, buffers[1]);
158 b[2] = vlib_get_buffer (vm, buffers[2]);
159 b[3] = vlib_get_buffer (vm, buffers[3]);
161 or_flags = b[0]->flags | b[1]->flags | b[2]->flags | b[3]->flags;
164 (VLIB_BUFFER_NEXT_PRESENT | VNET_BUFFER_F_OFFLOAD_IP_CKSUM |
165 VNET_BUFFER_F_OFFLOAD_TCP_CKSUM | VNET_BUFFER_F_OFFLOAD_UDP_CKSUM))
168 vlib_buffer_copy_indices (txq->bufs + next, buffers, 4);
172 d[0].qword[0] = vlib_buffer_get_current_va (b[0]);
173 d[1].qword[0] = vlib_buffer_get_current_va (b[1]);
174 d[2].qword[0] = vlib_buffer_get_current_va (b[2]);
175 d[3].qword[0] = vlib_buffer_get_current_va (b[3]);
179 d[0].qword[0] = vlib_buffer_get_current_pa (vm, b[0]);
180 d[1].qword[0] = vlib_buffer_get_current_pa (vm, b[1]);
181 d[2].qword[0] = vlib_buffer_get_current_pa (vm, b[2]);
182 d[3].qword[0] = vlib_buffer_get_current_pa (vm, b[3]);
185 d[0].qword[1] = ((u64) b[0]->current_length) << 34 | bits;
186 d[1].qword[1] = ((u64) b[1]->current_length) << 34 | bits;
187 d[2].qword[1] = ((u64) b[2]->current_length) << 34 | bits;
188 d[3].qword[1] = ((u64) b[3]->current_length) << 34 | bits;
199 one_by_one_offload_flags = 0;
200 txq->bufs[next] = buffers[0];
201 b[0] = vlib_get_buffer (vm, buffers[0]);
203 if (PREDICT_FALSE (b[0]->flags & (VNET_BUFFER_F_OFFLOAD_IP_CKSUM |
204 VNET_BUFFER_F_OFFLOAD_TCP_CKSUM |
205 VNET_BUFFER_F_OFFLOAD_UDP_CKSUM)))
206 one_by_one_offload_flags |=
207 avf_tx_prepare_cksum (b[0], 0 /* no TSO */ );
209 /* Deal with chain buffer if present */
210 if (b[0]->flags & VLIB_BUFFER_NEXT_PRESENT)
215 /* Wish there were a buffer count for chain buffer */
216 while (b0->flags & VLIB_BUFFER_NEXT_PRESENT)
218 b0 = vlib_get_buffer (vm, b0->next_buffer);
222 /* spec says data descriptor is limited to 8 segments */
223 if (PREDICT_FALSE (n_desc_needed > 8))
225 vlib_buffer_free_one (vm, buffers[0]);
226 vlib_error_count (vm, node->node_index,
227 AVF_TX_ERROR_SEGMENT_SIZE_EXCEEDED, 1);
233 if (PREDICT_FALSE (n_desc_left < n_desc_needed))
235 * Slow path may be able to to deal with this since it can handle
240 while (b[0]->flags & VLIB_BUFFER_NEXT_PRESENT)
243 d[0].qword[0] = vlib_buffer_get_current_va (b[0]);
245 d[0].qword[0] = vlib_buffer_get_current_pa (vm, b[0]);
247 d[0].qword[1] = (((u64) b[0]->current_length) << 34) |
248 AVF_TXD_CMD_RSV | one_by_one_offload_flags;
255 txq->bufs[next] = b[0]->next_buffer;
256 b[0] = vlib_get_buffer (vm, b[0]->next_buffer);
261 d[0].qword[0] = vlib_buffer_get_current_va (b[0]);
263 d[0].qword[0] = vlib_buffer_get_current_pa (vm, b[0]);
266 (((u64) b[0]->current_length) << 34) | bits |
267 one_by_one_offload_flags;
277 /* Slow path to support ring wrap */
278 if (PREDICT_FALSE (n_packets_left))
280 txq->n_enqueued += n_desc;
283 d = txq->descs + (next & mask);
285 /* +8 to be consistent with fast path */
286 n_desc_left = txq->size - (txq->n_enqueued + 8);
288 while (n_packets_left && n_desc_left)
291 txq->bufs[next & mask] = buffers[0];
292 b[0] = vlib_get_buffer (vm, buffers[0]);
294 one_by_one_offload_flags = 0;
295 if (PREDICT_FALSE (b[0]->flags & (VNET_BUFFER_F_OFFLOAD_IP_CKSUM |
296 VNET_BUFFER_F_OFFLOAD_TCP_CKSUM |
297 VNET_BUFFER_F_OFFLOAD_UDP_CKSUM)))
298 one_by_one_offload_flags |=
299 avf_tx_prepare_cksum (b[0], 0 /* no TSO */ );
301 /* Deal with chain buffer if present */
302 if (b[0]->flags & VLIB_BUFFER_NEXT_PRESENT)
307 while (b0->flags & VLIB_BUFFER_NEXT_PRESENT)
309 b0 = vlib_get_buffer (vm, b0->next_buffer);
313 /* Spec says data descriptor is limited to 8 segments */
314 if (PREDICT_FALSE (n_desc_needed > 8))
316 vlib_buffer_free_one (vm, buffers[0]);
317 vlib_error_count (vm, node->node_index,
318 AVF_TX_ERROR_SEGMENT_SIZE_EXCEEDED, 1);
324 if (PREDICT_FALSE (n_desc_left < n_desc_needed))
327 while (b[0]->flags & VLIB_BUFFER_NEXT_PRESENT)
330 d[0].qword[0] = vlib_buffer_get_current_va (b[0]);
332 d[0].qword[0] = vlib_buffer_get_current_pa (vm, b[0]);
334 d[0].qword[1] = (((u64) b[0]->current_length) << 34) |
335 AVF_TXD_CMD_RSV | one_by_one_offload_flags;
340 d = txq->descs + (next & mask);
342 txq->bufs[next & mask] = b[0]->next_buffer;
343 b[0] = vlib_get_buffer (vm, b[0]->next_buffer);
348 d[0].qword[0] = vlib_buffer_get_current_va (b[0]);
350 d[0].qword[0] = vlib_buffer_get_current_pa (vm, b[0]);
353 (((u64) b[0]->current_length) << 34) | bits |
354 one_by_one_offload_flags;
361 d = txq->descs + (next & mask);
365 if ((slot = clib_ring_enq (txq->rs_slots)))
367 u16 rs_slot = slot[0] = (next - 1) & mask;
368 d = txq->descs + rs_slot;
369 d[0].qword[1] |= AVF_TXD_CMD_RS;
372 txq->next = next & mask;
373 clib_atomic_store_rel_n (txq->qtx_tail, txq->next);
374 txq->n_enqueued += n_desc;
375 return n_packets - n_packets_left;
378 VNET_DEVICE_CLASS_TX_FN (avf_device_class) (vlib_main_t * vm,
379 vlib_node_runtime_t * node,
380 vlib_frame_t * frame)
382 vnet_interface_output_runtime_t *rd = (void *) node->runtime_data;
383 avf_device_t *ad = avf_get_device (rd->dev_instance);
384 u32 thread_index = vm->thread_index;
385 u8 qid = thread_index;
386 avf_txq_t *txq = vec_elt_at_index (ad->txqs, qid % ad->num_queue_pairs);
387 u32 *buffers = vlib_frame_vector_args (frame);
391 clib_spinlock_lock_if_init (&txq->lock);
393 n_left = frame->n_vectors;
396 /* release consumed bufs */
399 i32 complete_slot = -1;
402 u16 *slot = clib_ring_get_first (txq->rs_slots);
407 if (avf_tx_desc_get_dtyp (txq->descs + slot[0]) != 0x0F)
410 complete_slot = slot[0];
412 clib_ring_deq (txq->rs_slots);
415 if (complete_slot >= 0)
417 u16 first, mask, n_free;
418 mask = txq->size - 1;
419 first = (txq->next - txq->n_enqueued) & mask;
420 n_free = (complete_slot + 1 - first) & mask;
422 txq->n_enqueued -= n_free;
423 vlib_buffer_free_from_ring_no_next (vm, txq->bufs, first, txq->size,
428 if (ad->flags & AVF_DEVICE_F_VA_DMA)
429 n_enq = avf_tx_enqueue (vm, node, txq, buffers, n_left, 1);
431 n_enq = avf_tx_enqueue (vm, node, txq, buffers, n_left, 0);
442 vlib_buffer_free (vm, buffers, n_left);
443 vlib_error_count (vm, node->node_index,
444 AVF_TX_ERROR_NO_FREE_SLOTS, n_left);
447 clib_spinlock_unlock_if_init (&txq->lock);
449 return frame->n_vectors - n_left;
453 * fd.io coding-style-patch-verification: ON
456 * eval: (c-set-style "gnu")