1 /* SPDX-License-Identifier: Apache-2.0
2 * Copyright (c) 2023 Cisco Systems, Inc.
6 #include <vppinfra/ring.h>
7 #include <vppinfra/vector/ip_csum.h>
9 #include <vnet/dev/dev.h>
10 #include <vnet/ethernet/ethernet.h>
11 #include <vnet/ip/ip4_packet.h>
12 #include <vnet/ip/ip6_packet.h>
13 #include <vnet/udp/udp_packet.h>
14 #include <vnet/tcp/tcp_packet.h>
16 #include <dev_iavf/iavf.h>
18 static_always_inline u8
19 iavf_tx_desc_get_dtyp (iavf_tx_desc_t *d)
21 return d->qword[1] & 0x0f;
41 static_always_inline u64
42 iavf_tx_prepare_cksum (vlib_buffer_t *b, u8 is_tso)
45 if (!is_tso && !(b->flags & VNET_BUFFER_F_OFFLOAD))
48 vnet_buffer_oflags_t oflags = vnet_buffer (b)->oflags;
49 u32 is_tcp = is_tso || oflags & VNET_BUFFER_OFFLOAD_F_TCP_CKSUM;
50 u32 is_udp = !is_tso && oflags & VNET_BUFFER_OFFLOAD_F_UDP_CKSUM;
52 if (!is_tcp && !is_udp)
55 u32 is_ip4 = b->flags & VNET_BUFFER_F_IS_IP4;
56 u32 is_ip6 = b->flags & VNET_BUFFER_F_IS_IP6;
58 ASSERT (!(is_tcp && is_udp));
59 ASSERT (is_ip4 || is_ip6);
60 i16 l2_hdr_offset = b->current_data;
61 i16 l3_hdr_offset = vnet_buffer (b)->l3_hdr_offset;
62 i16 l4_hdr_offset = vnet_buffer (b)->l4_hdr_offset;
63 u16 l2_len = l3_hdr_offset - l2_hdr_offset;
64 u16 l3_len = l4_hdr_offset - l3_hdr_offset;
65 ip4_header_t *ip4 = (void *) (b->data + l3_hdr_offset);
66 ip6_header_t *ip6 = (void *) (b->data + l3_hdr_offset);
67 tcp_header_t *tcp = (void *) (b->data + l4_hdr_offset);
68 udp_header_t *udp = (void *) (b->data + l4_hdr_offset);
69 u16 l4_len = is_tcp ? tcp_header_bytes (tcp) : sizeof (udp_header_t);
72 flags |= IAVF_TXD_OFFSET_MACLEN (l2_len) | IAVF_TXD_OFFSET_IPLEN (l3_len) |
73 IAVF_TXD_OFFSET_L4LEN (l4_len);
74 flags |= is_ip4 ? IAVF_TXD_CMD_IIPT_IPV4 : IAVF_TXD_CMD_IIPT_IPV6;
75 flags |= is_tcp ? IAVF_TXD_CMD_L4T_TCP : IAVF_TXD_CMD_L4T_UDP;
85 ip6->payload_length = 0;
90 struct iavf_ip4_psh psh = { 0 };
91 psh.src = ip4->src_address.as_u32;
92 psh.dst = ip4->dst_address.as_u32;
93 psh.proto = ip4->protocol;
96 clib_host_to_net_u16 (clib_net_to_host_u16 (ip4->length) -
97 (l4_hdr_offset - l3_hdr_offset));
98 sum = ~clib_ip_csum ((u8 *) &psh, sizeof (psh));
102 struct iavf_ip6_psh psh = { 0 };
103 psh.src = ip6->src_address;
104 psh.dst = ip6->dst_address;
105 psh.proto = clib_host_to_net_u32 ((u32) ip6->protocol);
106 psh.l4len = is_tso ? 0 : ip6->payload_length;
107 sum = ~clib_ip_csum ((u8 *) &psh, sizeof (psh));
117 static_always_inline u32
118 iavf_tx_fill_ctx_desc (vlib_main_t *vm, vnet_dev_tx_queue_t *txq,
119 iavf_tx_desc_t *d, vlib_buffer_t *b)
121 iavf_txq_t *atq = vnet_dev_get_tx_queue_data (txq);
122 vlib_buffer_t *ctx_ph;
123 u32 *bi = atq->ph_bufs;
126 ctx_ph = vlib_get_buffer (vm, bi[0]);
127 if (PREDICT_FALSE (ctx_ph->ref_count == 255))
133 /* Acquire a reference on the placeholder buffer */
136 u16 l234hdr_sz = vnet_buffer (b)->l4_hdr_offset - b->current_data +
137 vnet_buffer2 (b)->gso_l4_hdr_sz;
138 u16 tlen = vlib_buffer_length_in_chain (vm, b) - l234hdr_sz;
140 d[0].qword[1] = IAVF_TXD_DTYP_CTX | IAVF_TXD_CTX_CMD_TSO |
141 IAVF_TXD_CTX_SEG_MSS (vnet_buffer2 (b)->gso_size) |
142 IAVF_TXD_CTX_SEG_TLEN (tlen);
146 static_always_inline void
147 iavf_tx_copy_desc (iavf_tx_desc_t *d, iavf_tx_desc_t *s, u32 n_descs)
149 #if defined CLIB_HAVE_VEC512
152 u64x8u *dv = (u64x8u *) d;
153 u64x8u *sv = (u64x8u *) s;
163 #elif defined CLIB_HAVE_VEC256
166 u64x4u *dv = (u64x4u *) d;
167 u64x4u *sv = (u64x4u *) s;
177 #elif defined CLIB_HAVE_VEC128
180 u64x2u *dv = (u64x2u *) d;
181 u64x2u *sv = (u64x2u *) s;
194 d[0].qword[0] = s[0].qword[0];
195 d[0].qword[1] = s[0].qword[1];
202 static_always_inline void
203 iavf_tx_fill_data_desc (vlib_main_t *vm, iavf_tx_desc_t *d, vlib_buffer_t *b,
204 u64 cmd, int use_va_dma)
207 d->qword[0] = vlib_buffer_get_current_va (b);
209 d->qword[0] = vlib_buffer_get_current_pa (vm, b);
210 d->qword[1] = (((u64) b->current_length) << 34 | cmd | IAVF_TXD_CMD_RSV);
212 static_always_inline u16
213 iavf_tx_prepare (vlib_main_t *vm, vlib_node_runtime_t *node,
214 vnet_dev_tx_queue_t *txq, u32 *buffers, u32 n_packets,
215 u16 *n_enq_descs, int use_va_dma)
217 iavf_txq_t *atq = vnet_dev_get_tx_queue_data (txq);
218 const u64 cmd_eop = IAVF_TXD_CMD_EOP;
219 u16 n_free_desc, n_desc_left, n_packets_left = n_packets;
220 #if defined CLIB_HAVE_VEC512
225 iavf_tx_desc_t *d = atq->tmp_descs;
226 u32 *tb = atq->tmp_bufs;
228 n_free_desc = n_desc_left = txq->size - atq->n_enqueued - 8;
230 if (n_desc_left == 0)
233 while (n_packets_left && n_desc_left)
235 #if defined CLIB_HAVE_VEC512
237 u64x8 or_flags_vec512;
238 u64x8 flags_mask_vec512;
243 #if defined CLIB_HAVE_VEC512
244 if (n_packets_left < 8 || n_desc_left < 8)
246 if (n_packets_left < 8 || n_desc_left < 4)
250 #if defined CLIB_HAVE_VEC512
251 u64x8 base_ptr = u64x8_splat (vm->buffer_main->buffer_mem_start);
252 u32x8 buf_indices = u32x8_load_unaligned (buffers);
254 *(u64x8 *) &b = base_ptr + u64x8_from_u32x8 (
255 buf_indices << CLIB_LOG2_CACHE_LINE_BYTES);
257 or_flags_vec512 = u64x8_i64gather (u64x8_load_unaligned (b), 0, 1);
259 vlib_prefetch_buffer_with_index (vm, buffers[4], LOAD);
260 vlib_prefetch_buffer_with_index (vm, buffers[5], LOAD);
261 vlib_prefetch_buffer_with_index (vm, buffers[6], LOAD);
262 vlib_prefetch_buffer_with_index (vm, buffers[7], LOAD);
264 b[0] = vlib_get_buffer (vm, buffers[0]);
265 b[1] = vlib_get_buffer (vm, buffers[1]);
266 b[2] = vlib_get_buffer (vm, buffers[2]);
267 b[3] = vlib_get_buffer (vm, buffers[3]);
269 or_flags = b[0]->flags | b[1]->flags | b[2]->flags | b[3]->flags;
272 #if defined CLIB_HAVE_VEC512
273 flags_mask_vec512 = u64x8_splat (
274 VLIB_BUFFER_NEXT_PRESENT | VNET_BUFFER_F_OFFLOAD | VNET_BUFFER_F_GSO);
276 !u64x8_is_all_zero (or_flags_vec512 & flags_mask_vec512)))
278 if (PREDICT_FALSE (or_flags &
279 (VLIB_BUFFER_NEXT_PRESENT | VNET_BUFFER_F_OFFLOAD |
284 #if defined CLIB_HAVE_VEC512
285 vlib_buffer_copy_indices (tb, buffers, 8);
286 iavf_tx_fill_data_desc (vm, d + 0, b[0], cmd_eop, use_va_dma);
287 iavf_tx_fill_data_desc (vm, d + 1, b[1], cmd_eop, use_va_dma);
288 iavf_tx_fill_data_desc (vm, d + 2, b[2], cmd_eop, use_va_dma);
289 iavf_tx_fill_data_desc (vm, d + 3, b[3], cmd_eop, use_va_dma);
290 iavf_tx_fill_data_desc (vm, d + 4, b[4], cmd_eop, use_va_dma);
291 iavf_tx_fill_data_desc (vm, d + 5, b[5], cmd_eop, use_va_dma);
292 iavf_tx_fill_data_desc (vm, d + 6, b[6], cmd_eop, use_va_dma);
293 iavf_tx_fill_data_desc (vm, d + 7, b[7], cmd_eop, use_va_dma);
301 vlib_buffer_copy_indices (tb, buffers, 4);
303 iavf_tx_fill_data_desc (vm, d + 0, b[0], cmd_eop, use_va_dma);
304 iavf_tx_fill_data_desc (vm, d + 1, b[1], cmd_eop, use_va_dma);
305 iavf_tx_fill_data_desc (vm, d + 2, b[2], cmd_eop, use_va_dma);
306 iavf_tx_fill_data_desc (vm, d + 3, b[3], cmd_eop, use_va_dma);
319 b[0] = vlib_get_buffer (vm, buffers[0]);
322 /* No chained buffers or TSO case */
324 (flags & (VLIB_BUFFER_NEXT_PRESENT | VNET_BUFFER_F_GSO)) == 0))
328 if (PREDICT_FALSE (flags & VNET_BUFFER_F_OFFLOAD))
329 cmd |= iavf_tx_prepare_cksum (b[0], 0 /* is_tso */);
331 iavf_tx_fill_data_desc (vm, d, b[0], cmd, use_va_dma);
335 u16 n_desc_needed = 1;
338 if (flags & VLIB_BUFFER_NEXT_PRESENT)
340 vlib_buffer_t *next = vlib_get_buffer (vm, b[0]->next_buffer);
342 while (next->flags & VLIB_BUFFER_NEXT_PRESENT)
344 next = vlib_get_buffer (vm, next->next_buffer);
349 if (flags & VNET_BUFFER_F_GSO)
353 else if (PREDICT_FALSE (n_desc_needed > 8))
355 vlib_buffer_free_one (vm, buffers[0]);
356 vlib_error_count (vm, node->node_index,
357 IAVF_TX_NODE_CTR_SEG_SZ_EXCEEDED, 1);
363 if (PREDICT_FALSE (n_desc_left < n_desc_needed))
366 if (flags & VNET_BUFFER_F_GSO)
368 /* Enqueue a context descriptor */
370 tb[0] = iavf_tx_fill_ctx_desc (vm, txq, d, b[0]);
374 cmd = iavf_tx_prepare_cksum (b[0], 1 /* is_tso */);
376 else if (flags & VNET_BUFFER_F_OFFLOAD)
378 cmd = iavf_tx_prepare_cksum (b[0], 0 /* is_tso */);
381 /* Deal with chain buffer if present */
382 while (b[0]->flags & VLIB_BUFFER_NEXT_PRESENT)
384 iavf_tx_fill_data_desc (vm, d, b[0], cmd, use_va_dma);
390 tb[0] = b[0]->next_buffer;
391 b[0] = vlib_get_buffer (vm, b[0]->next_buffer);
394 iavf_tx_fill_data_desc (vm, d, b[0], cmd_eop | cmd, use_va_dma);
404 *n_enq_descs = n_free_desc - n_desc_left;
405 return n_packets - n_packets_left;
408 VNET_DEV_NODE_FN (iavf_tx_node)
409 (vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *frame)
411 vnet_dev_tx_node_runtime_t *rt = vnet_dev_get_tx_node_runtime (node);
412 vnet_dev_tx_queue_t *txq = rt->tx_queue;
413 vnet_dev_port_t *port = txq->port;
414 vnet_dev_t *dev = port->dev;
415 iavf_txq_t *atq = vnet_dev_get_tx_queue_data (txq);
417 u16 mask = txq->size - 1;
418 u32 *buffers = vlib_frame_vector_args (frame);
419 u16 n_enq, n_left, n_desc, *slot;
422 n_left = frame->n_vectors;
424 vnet_dev_tx_queue_lock_if_needed (txq);
428 /* release consumed bufs */
431 i32 complete_slot = -1;
434 u16 *slot = clib_ring_get_first (atq->rs_slots);
439 if (iavf_tx_desc_get_dtyp (atq->descs + slot[0]) != 0x0F)
442 complete_slot = slot[0];
444 clib_ring_deq (atq->rs_slots);
447 if (complete_slot >= 0)
449 u16 first, mask, n_free;
450 mask = txq->size - 1;
451 first = (atq->next - atq->n_enqueued) & mask;
452 n_free = (complete_slot + 1 - first) & mask;
454 atq->n_enqueued -= n_free;
455 vlib_buffer_free_from_ring_no_next (vm, atq->buffer_indices, first,
462 n_enq = iavf_tx_prepare (vm, node, txq, buffers, n_left, &n_desc, 1);
464 n_enq = iavf_tx_prepare (vm, node, txq, buffers, n_left, &n_desc, 0);
468 if (PREDICT_TRUE (next + n_desc <= txq->size))
471 iavf_tx_copy_desc (atq->descs + next, atq->tmp_descs, n_desc);
472 vlib_buffer_copy_indices (atq->buffer_indices + next, atq->tmp_bufs,
478 u32 n_not_wrap = txq->size - next;
479 iavf_tx_copy_desc (atq->descs + next, atq->tmp_descs, n_not_wrap);
480 iavf_tx_copy_desc (atq->descs, atq->tmp_descs + n_not_wrap,
481 n_desc - n_not_wrap);
482 vlib_buffer_copy_indices (atq->buffer_indices + next, atq->tmp_bufs,
484 vlib_buffer_copy_indices (atq->buffer_indices,
485 atq->tmp_bufs + n_not_wrap,
486 n_desc - n_not_wrap);
490 if ((slot = clib_ring_enq (atq->rs_slots)))
492 u16 rs_slot = slot[0] = (next - 1) & mask;
493 atq->descs[rs_slot].qword[1] |= IAVF_TXD_CMD_RS;
496 atq->next = next & mask;
497 __atomic_store_n (atq->qtx_tail, atq->next, __ATOMIC_RELEASE);
498 atq->n_enqueued += n_desc;
509 vlib_buffer_free (vm, buffers, n_left);
510 vlib_error_count (vm, node->node_index, IAVF_TX_NODE_CTR_NO_FREE_SLOTS,
514 vnet_dev_tx_queue_unlock_if_needed (txq);
516 return frame->n_vectors - n_left;