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))
63 vnet_buffer_oflags_t oflags = vnet_buffer (b)->oflags;
64 u32 is_tcp = is_tso || oflags & VNET_BUFFER_OFFLOAD_F_TCP_CKSUM;
65 u32 is_udp = !is_tso && oflags & VNET_BUFFER_OFFLOAD_F_UDP_CKSUM;
67 if (!is_tcp && !is_udp)
70 u32 is_ip4 = b->flags & VNET_BUFFER_F_IS_IP4;
71 u32 is_ip6 = b->flags & VNET_BUFFER_F_IS_IP6;
73 ASSERT (!(is_tcp && is_udp));
74 ASSERT (is_ip4 || is_ip6);
75 i16 l2_hdr_offset = b->current_data;
76 i16 l3_hdr_offset = vnet_buffer (b)->l3_hdr_offset;
77 i16 l4_hdr_offset = vnet_buffer (b)->l4_hdr_offset;
78 u16 l2_len = l3_hdr_offset - l2_hdr_offset;
79 u16 l3_len = l4_hdr_offset - l3_hdr_offset;
80 ip4_header_t *ip4 = (void *) (b->data + l3_hdr_offset);
81 ip6_header_t *ip6 = (void *) (b->data + l3_hdr_offset);
82 tcp_header_t *tcp = (void *) (b->data + l4_hdr_offset);
83 udp_header_t *udp = (void *) (b->data + l4_hdr_offset);
84 u16 l4_len = is_tcp ? tcp_header_bytes (tcp) : sizeof (udp_header_t);
87 flags |= AVF_TXD_OFFSET_MACLEN (l2_len) |
88 AVF_TXD_OFFSET_IPLEN (l3_len) | AVF_TXD_OFFSET_L4LEN (l4_len);
89 flags |= is_ip4 ? AVF_TXD_CMD_IIPT_IPV4 : AVF_TXD_CMD_IIPT_IPV6;
90 flags |= is_tcp ? AVF_TXD_CMD_L4T_TCP : AVF_TXD_CMD_L4T_UDP;
100 ip6->payload_length = 0;
105 struct avf_ip4_psh psh = { 0 };
106 psh.src = ip4->src_address.as_u32;
107 psh.dst = ip4->dst_address.as_u32;
108 psh.proto = ip4->protocol;
111 clib_host_to_net_u16 (clib_net_to_host_u16 (ip4->length) -
112 (l4_hdr_offset - l3_hdr_offset));
113 sum = ~ip_csum (&psh, sizeof (psh));
117 struct avf_ip6_psh psh = { 0 };
118 psh.src = ip6->src_address;
119 psh.dst = ip6->dst_address;
120 psh.proto = clib_host_to_net_u32 ((u32) ip6->protocol);
121 psh.l4len = is_tso ? 0 : ip6->payload_length;
122 sum = ~ip_csum (&psh, sizeof (psh));
125 /* ip_csum does a byte swap for some reason... */
126 sum = clib_net_to_host_u16 (sum);
134 static_always_inline u32
135 avf_tx_fill_ctx_desc (vlib_main_t *vm, avf_txq_t *txq, avf_tx_desc_t *d,
138 vlib_buffer_t *ctx_ph;
139 u32 *bi = txq->ph_bufs;
142 ctx_ph = vlib_get_buffer (vm, bi[0]);
143 if (PREDICT_FALSE (ctx_ph->ref_count == 255))
149 /* Acquire a reference on the placeholder buffer */
152 u16 l234hdr_sz = vnet_buffer (b)->l4_hdr_offset - b->current_data +
153 vnet_buffer2 (b)->gso_l4_hdr_sz;
154 u16 tlen = vlib_buffer_length_in_chain (vm, b) - l234hdr_sz;
156 d[0].qword[1] = AVF_TXD_DTYP_CTX | AVF_TXD_CTX_CMD_TSO
157 | AVF_TXD_CTX_SEG_MSS (vnet_buffer2 (b)->gso_size) |
158 AVF_TXD_CTX_SEG_TLEN (tlen);
162 static_always_inline void
163 avf_tx_copy_desc (avf_tx_desc_t *d, avf_tx_desc_t *s, u32 n_descs)
165 #if defined CLIB_HAVE_VEC512
168 u64x8u *dv = (u64x8u *) d;
169 u64x8u *sv = (u64x8u *) s;
179 #elif defined CLIB_HAVE_VEC256
182 u64x4u *dv = (u64x4u *) d;
183 u64x4u *sv = (u64x4u *) s;
193 #elif defined CLIB_HAVE_VEC128
196 u64x2u *dv = (u64x2u *) d;
197 u64x2u *sv = (u64x2u *) s;
210 d[0].qword[0] = s[0].qword[0];
211 d[0].qword[1] = s[0].qword[1];
218 static_always_inline void
219 avf_tx_fill_data_desc (vlib_main_t *vm, avf_tx_desc_t *d, vlib_buffer_t *b,
220 u64 cmd, int use_va_dma)
223 d->qword[0] = vlib_buffer_get_current_va (b);
225 d->qword[0] = vlib_buffer_get_current_pa (vm, b);
226 d->qword[1] = (((u64) b->current_length) << 34 | cmd | AVF_TXD_CMD_RSV);
228 static_always_inline u16
229 avf_tx_prepare (vlib_main_t *vm, vlib_node_runtime_t *node, avf_txq_t *txq,
230 u32 *buffers, u32 n_packets, u16 *n_enq_descs, int use_va_dma)
232 const u64 cmd_eop = AVF_TXD_CMD_EOP;
233 u16 n_free_desc, n_desc_left, n_packets_left = n_packets;
235 avf_tx_desc_t *d = txq->tmp_descs;
236 u32 *tb = txq->tmp_bufs;
238 n_free_desc = n_desc_left = txq->size - txq->n_enqueued - 8;
240 if (n_desc_left == 0)
243 while (n_packets_left && n_desc_left)
247 if (n_packets_left < 8 || n_desc_left < 4)
250 vlib_prefetch_buffer_with_index (vm, buffers[4], LOAD);
251 vlib_prefetch_buffer_with_index (vm, buffers[5], LOAD);
252 vlib_prefetch_buffer_with_index (vm, buffers[6], LOAD);
253 vlib_prefetch_buffer_with_index (vm, buffers[7], LOAD);
255 b[0] = vlib_get_buffer (vm, buffers[0]);
256 b[1] = vlib_get_buffer (vm, buffers[1]);
257 b[2] = vlib_get_buffer (vm, buffers[2]);
258 b[3] = vlib_get_buffer (vm, buffers[3]);
260 or_flags = b[0]->flags | b[1]->flags | b[2]->flags | b[3]->flags;
262 if (PREDICT_FALSE (or_flags &
263 (VLIB_BUFFER_NEXT_PRESENT | VNET_BUFFER_F_OFFLOAD |
267 vlib_buffer_copy_indices (tb, buffers, 4);
269 avf_tx_fill_data_desc (vm, d + 0, b[0], cmd_eop, use_va_dma);
270 avf_tx_fill_data_desc (vm, d + 1, b[1], cmd_eop, use_va_dma);
271 avf_tx_fill_data_desc (vm, d + 2, b[2], cmd_eop, use_va_dma);
272 avf_tx_fill_data_desc (vm, d + 3, b[3], cmd_eop, use_va_dma);
283 b[0] = vlib_get_buffer (vm, buffers[0]);
286 /* No chained buffers or TSO case */
288 (flags & (VLIB_BUFFER_NEXT_PRESENT | VNET_BUFFER_F_GSO)) == 0))
292 if (PREDICT_FALSE (flags & VNET_BUFFER_F_OFFLOAD))
293 cmd |= avf_tx_prepare_cksum (b[0], 0 /* is_tso */);
295 avf_tx_fill_data_desc (vm, d, b[0], cmd, use_va_dma);
299 u16 n_desc_needed = 1;
302 if (flags & VLIB_BUFFER_NEXT_PRESENT)
304 vlib_buffer_t *next = vlib_get_buffer (vm, b[0]->next_buffer);
306 while (next->flags & VLIB_BUFFER_NEXT_PRESENT)
308 next = vlib_get_buffer (vm, next->next_buffer);
313 if (flags & VNET_BUFFER_F_GSO)
317 else if (PREDICT_FALSE (n_desc_needed > 8))
319 vlib_buffer_free_one (vm, buffers[0]);
320 vlib_error_count (vm, node->node_index,
321 AVF_TX_ERROR_SEGMENT_SIZE_EXCEEDED, 1);
327 if (PREDICT_FALSE (n_desc_left < n_desc_needed))
330 if (flags & VNET_BUFFER_F_GSO)
332 /* Enqueue a context descriptor */
334 tb[0] = avf_tx_fill_ctx_desc (vm, txq, d, b[0]);
338 cmd = avf_tx_prepare_cksum (b[0], 1 /* is_tso */);
340 else if (flags & VNET_BUFFER_F_OFFLOAD)
342 cmd = avf_tx_prepare_cksum (b[0], 0 /* is_tso */);
345 /* Deal with chain buffer if present */
346 while (b[0]->flags & VLIB_BUFFER_NEXT_PRESENT)
348 avf_tx_fill_data_desc (vm, d, b[0], cmd, use_va_dma);
354 tb[0] = b[0]->next_buffer;
355 b[0] = vlib_get_buffer (vm, b[0]->next_buffer);
358 avf_tx_fill_data_desc (vm, d, b[0], cmd_eop | cmd, use_va_dma);
368 *n_enq_descs = n_free_desc - n_desc_left;
369 return n_packets - n_packets_left;
372 VNET_DEVICE_CLASS_TX_FN (avf_device_class) (vlib_main_t * vm,
373 vlib_node_runtime_t * node,
374 vlib_frame_t * frame)
376 vnet_interface_output_runtime_t *rd = (void *) node->runtime_data;
377 avf_device_t *ad = avf_get_device (rd->dev_instance);
378 u32 thread_index = vm->thread_index;
379 u8 qid = thread_index;
380 avf_txq_t *txq = vec_elt_at_index (ad->txqs, qid % ad->num_queue_pairs);
382 u16 mask = txq->size - 1;
383 u32 *buffers = vlib_frame_vector_args (frame);
384 u16 n_enq, n_left, n_desc, *slot;
387 clib_spinlock_lock_if_init (&txq->lock);
389 n_left = frame->n_vectors;
393 /* release consumed bufs */
396 i32 complete_slot = -1;
399 u16 *slot = clib_ring_get_first (txq->rs_slots);
404 if (avf_tx_desc_get_dtyp (txq->descs + slot[0]) != 0x0F)
407 complete_slot = slot[0];
409 clib_ring_deq (txq->rs_slots);
412 if (complete_slot >= 0)
414 u16 first, mask, n_free;
415 mask = txq->size - 1;
416 first = (txq->next - txq->n_enqueued) & mask;
417 n_free = (complete_slot + 1 - first) & mask;
419 txq->n_enqueued -= n_free;
420 vlib_buffer_free_from_ring_no_next (vm, txq->bufs, first, txq->size,
426 if (ad->flags & AVF_DEVICE_F_VA_DMA)
427 n_enq = avf_tx_prepare (vm, node, txq, buffers, n_left, &n_desc, 1);
429 n_enq = avf_tx_prepare (vm, node, txq, buffers, n_left, &n_desc, 0);
433 if (PREDICT_TRUE (next + n_desc <= txq->size))
436 avf_tx_copy_desc (txq->descs + next, txq->tmp_descs, n_desc);
437 vlib_buffer_copy_indices (txq->bufs + next, txq->tmp_bufs, n_desc);
442 u32 n_not_wrap = txq->size - next;
443 avf_tx_copy_desc (txq->descs + next, txq->tmp_descs, n_not_wrap);
444 avf_tx_copy_desc (txq->descs, txq->tmp_descs + n_not_wrap,
445 n_desc - n_not_wrap);
446 vlib_buffer_copy_indices (txq->bufs + next, txq->tmp_bufs,
448 vlib_buffer_copy_indices (txq->bufs, txq->tmp_bufs + n_not_wrap,
449 n_desc - n_not_wrap);
453 if ((slot = clib_ring_enq (txq->rs_slots)))
455 u16 rs_slot = slot[0] = (next - 1) & mask;
456 txq->descs[rs_slot].qword[1] |= AVF_TXD_CMD_RS;
459 txq->next = next & mask;
460 avf_tail_write (txq->qtx_tail, txq->next);
461 txq->n_enqueued += n_desc;
472 vlib_buffer_free (vm, buffers, n_left);
473 vlib_error_count (vm, node->node_index,
474 AVF_TX_ERROR_NO_FREE_SLOTS, n_left);
477 clib_spinlock_unlock_if_init (&txq->lock);
479 return frame->n_vectors - n_left;
483 * fd.io coding-style-patch-verification: ON
486 * eval: (c-set-style "gnu")