bnxt_txr.c revision 809f0800
1/*-
2 *   BSD LICENSE
3 *
4 *   Copyright(c) Broadcom Limited.
5 *   All rights reserved.
6 *
7 *   Redistribution and use in source and binary forms, with or without
8 *   modification, are permitted provided that the following conditions
9 *   are met:
10 *
11 *     * Redistributions of source code must retain the above copyright
12 *       notice, this list of conditions and the following disclaimer.
13 *     * Redistributions in binary form must reproduce the above copyright
14 *       notice, this list of conditions and the following disclaimer in
15 *       the documentation and/or other materials provided with the
16 *       distribution.
17 *     * Neither the name of Broadcom Corporation nor the names of its
18 *       contributors may be used to endorse or promote products derived
19 *       from this software without specific prior written permission.
20 *
21 *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
22 *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
23 *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
24 *   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
25 *   OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
26 *   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
27 *   LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
28 *   DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
29 *   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
30 *   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
31 *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
32 */
33
34#include <inttypes.h>
35
36#include <rte_byteorder.h>
37#include <rte_malloc.h>
38
39#include "bnxt.h"
40#include "bnxt_cpr.h"
41#include "bnxt_ring.h"
42#include "bnxt_txq.h"
43#include "bnxt_txr.h"
44#include "hsi_struct_def_dpdk.h"
45#include <stdbool.h>
46
47/*
48 * TX Ring handling
49 */
50
51void bnxt_free_tx_rings(struct bnxt *bp)
52{
53	int i;
54
55	for (i = 0; i < (int)bp->tx_nr_rings; i++) {
56		struct bnxt_tx_queue *txq = bp->tx_queues[i];
57
58		if (!txq)
59			continue;
60
61		bnxt_free_ring(txq->tx_ring->tx_ring_struct);
62		rte_free(txq->tx_ring->tx_ring_struct);
63		rte_free(txq->tx_ring);
64
65		bnxt_free_ring(txq->cp_ring->cp_ring_struct);
66		rte_free(txq->cp_ring->cp_ring_struct);
67		rte_free(txq->cp_ring);
68
69		rte_free(txq);
70		bp->tx_queues[i] = NULL;
71	}
72}
73
74int bnxt_init_one_tx_ring(struct bnxt_tx_queue *txq)
75{
76	struct bnxt_tx_ring_info *txr = txq->tx_ring;
77	struct bnxt_ring *ring = txr->tx_ring_struct;
78
79	txq->tx_wake_thresh = ring->ring_size / 2;
80	ring->fw_ring_id = INVALID_HW_RING_ID;
81
82	return 0;
83}
84
85int bnxt_init_tx_ring_struct(struct bnxt_tx_queue *txq, unsigned int socket_id)
86{
87	struct bnxt_cp_ring_info *cpr;
88	struct bnxt_tx_ring_info *txr;
89	struct bnxt_ring *ring;
90
91	txr = rte_zmalloc_socket("bnxt_tx_ring",
92				 sizeof(struct bnxt_tx_ring_info),
93				 RTE_CACHE_LINE_SIZE, socket_id);
94	if (txr == NULL)
95		return -ENOMEM;
96	txq->tx_ring = txr;
97
98	ring = rte_zmalloc_socket("bnxt_tx_ring_struct",
99				  sizeof(struct bnxt_ring),
100				  RTE_CACHE_LINE_SIZE, socket_id);
101	if (ring == NULL)
102		return -ENOMEM;
103	txr->tx_ring_struct = ring;
104	ring->ring_size = rte_align32pow2(txq->nb_tx_desc + 1);
105	ring->ring_mask = ring->ring_size - 1;
106	ring->bd = (void *)txr->tx_desc_ring;
107	ring->bd_dma = txr->tx_desc_mapping;
108	ring->vmem_size = ring->ring_size * sizeof(struct bnxt_sw_tx_bd);
109	ring->vmem = (void **)&txr->tx_buf_ring;
110
111	cpr = rte_zmalloc_socket("bnxt_tx_ring",
112				 sizeof(struct bnxt_cp_ring_info),
113				 RTE_CACHE_LINE_SIZE, socket_id);
114	if (cpr == NULL)
115		return -ENOMEM;
116	txq->cp_ring = cpr;
117
118	ring = rte_zmalloc_socket("bnxt_tx_ring_struct",
119				  sizeof(struct bnxt_ring),
120				  RTE_CACHE_LINE_SIZE, socket_id);
121	if (ring == NULL)
122		return -ENOMEM;
123	cpr->cp_ring_struct = ring;
124	ring->ring_size = txr->tx_ring_struct->ring_size;
125	ring->ring_mask = ring->ring_size - 1;
126	ring->bd = (void *)cpr->cp_desc_ring;
127	ring->bd_dma = cpr->cp_desc_mapping;
128	ring->vmem_size = 0;
129	ring->vmem = NULL;
130
131	return 0;
132}
133
134static inline uint32_t bnxt_tx_avail(struct bnxt_tx_ring_info *txr)
135{
136	/* Tell compiler to fetch tx indices from memory. */
137	rte_compiler_barrier();
138
139	return txr->tx_ring_struct->ring_size -
140		((txr->tx_prod - txr->tx_cons) &
141			txr->tx_ring_struct->ring_mask) - 1;
142}
143
144static uint16_t bnxt_start_xmit(struct rte_mbuf *tx_pkt,
145				struct bnxt_tx_queue *txq)
146{
147	struct bnxt_tx_ring_info *txr = txq->tx_ring;
148	struct tx_bd_long *txbd;
149	struct tx_bd_long_hi *txbd1;
150	uint32_t vlan_tag_flags, cfa_action;
151	bool long_bd = false;
152	uint16_t last_prod = 0;
153	struct rte_mbuf *m_seg;
154	struct bnxt_sw_tx_bd *tx_buf;
155	static const uint32_t lhint_arr[4] = {
156		TX_BD_LONG_FLAGS_LHINT_LT512,
157		TX_BD_LONG_FLAGS_LHINT_LT1K,
158		TX_BD_LONG_FLAGS_LHINT_LT2K,
159		TX_BD_LONG_FLAGS_LHINT_LT2K
160	};
161
162	if (tx_pkt->ol_flags & (PKT_TX_TCP_SEG | PKT_TX_TCP_CKSUM |
163				PKT_TX_UDP_CKSUM | PKT_TX_IP_CKSUM |
164				PKT_TX_VLAN_PKT))
165		long_bd = true;
166
167	tx_buf = &txr->tx_buf_ring[txr->tx_prod];
168	tx_buf->mbuf = tx_pkt;
169	tx_buf->nr_bds = long_bd + tx_pkt->nb_segs;
170	last_prod = (txr->tx_prod + tx_buf->nr_bds - 1) &
171				txr->tx_ring_struct->ring_mask;
172
173	if (unlikely(bnxt_tx_avail(txr) < tx_buf->nr_bds))
174		return -ENOMEM;
175
176	txbd = &txr->tx_desc_ring[txr->tx_prod];
177	txbd->opaque = txr->tx_prod;
178	txbd->flags_type = tx_buf->nr_bds << TX_BD_LONG_FLAGS_BD_CNT_SFT;
179	txbd->len = tx_pkt->data_len;
180	if (txbd->len >= 2014)
181		txbd->flags_type |= TX_BD_LONG_FLAGS_LHINT_GTE2K;
182	else
183		txbd->flags_type |= lhint_arr[txbd->len >> 9];
184	txbd->addr = rte_cpu_to_le_32(RTE_MBUF_DATA_DMA_ADDR(tx_buf->mbuf));
185
186	if (long_bd) {
187		txbd->flags_type |= TX_BD_LONG_TYPE_TX_BD_LONG;
188		vlan_tag_flags = 0;
189		cfa_action = 0;
190		if (tx_buf->mbuf->ol_flags & PKT_TX_VLAN_PKT) {
191			/* shurd: Should this mask at
192			 * TX_BD_LONG_CFA_META_VLAN_VID_MASK?
193			 */
194			vlan_tag_flags = TX_BD_LONG_CFA_META_KEY_VLAN_TAG |
195				tx_buf->mbuf->vlan_tci;
196			/* Currently supports 8021Q, 8021AD vlan offloads
197			 * QINQ1, QINQ2, QINQ3 vlan headers are deprecated
198			 */
199			/* DPDK only supports 802.11q VLAN packets */
200			vlan_tag_flags |=
201					TX_BD_LONG_CFA_META_VLAN_TPID_TPID8100;
202		}
203
204		txr->tx_prod = RING_NEXT(txr->tx_ring_struct, txr->tx_prod);
205
206		txbd1 = (struct tx_bd_long_hi *)
207					&txr->tx_desc_ring[txr->tx_prod];
208		txbd1->lflags = 0;
209		txbd1->cfa_meta = vlan_tag_flags;
210		txbd1->cfa_action = cfa_action;
211
212		if (tx_pkt->ol_flags & PKT_TX_TCP_SEG) {
213			/* TSO */
214			txbd1->lflags = TX_BD_LONG_LFLAGS_LSO;
215			txbd1->hdr_size = tx_pkt->l2_len + tx_pkt->l3_len +
216					tx_pkt->l4_len;
217			txbd1->mss = tx_pkt->tso_segsz;
218
219		} else if (tx_pkt->ol_flags & (PKT_TX_TCP_CKSUM |
220					PKT_TX_UDP_CKSUM)) {
221			/* TCP/UDP CSO */
222			txbd1->lflags = TX_BD_LONG_LFLAGS_TCP_UDP_CHKSUM;
223			txbd1->mss = 0;
224
225		} else if (tx_pkt->ol_flags & PKT_TX_IP_CKSUM) {
226			/* IP CSO */
227			txbd1->lflags = TX_BD_LONG_LFLAGS_IP_CHKSUM;
228			txbd1->mss = 0;
229		}
230	} else {
231		txbd->flags_type |= TX_BD_SHORT_TYPE_TX_BD_SHORT;
232	}
233
234	m_seg = tx_pkt->next;
235	/* i is set at the end of the if(long_bd) block */
236	while (txr->tx_prod != last_prod) {
237		txr->tx_prod = RING_NEXT(txr->tx_ring_struct, txr->tx_prod);
238		tx_buf = &txr->tx_buf_ring[txr->tx_prod];
239
240		txbd = &txr->tx_desc_ring[txr->tx_prod];
241		txbd->addr = rte_cpu_to_le_32(RTE_MBUF_DATA_DMA_ADDR(m_seg));
242		txbd->flags_type = TX_BD_SHORT_TYPE_TX_BD_SHORT;
243		txbd->len = m_seg->data_len;
244
245		m_seg = m_seg->next;
246	}
247
248	txbd->flags_type |= TX_BD_LONG_FLAGS_PACKET_END;
249
250	txr->tx_prod = RING_NEXT(txr->tx_ring_struct, txr->tx_prod);
251
252	return 0;
253}
254
255static void bnxt_tx_cmp(struct bnxt_tx_queue *txq, int nr_pkts)
256{
257	struct bnxt_tx_ring_info *txr = txq->tx_ring;
258	uint16_t cons = txr->tx_cons;
259	int i, j;
260
261	for (i = 0; i < nr_pkts; i++) {
262		struct bnxt_sw_tx_bd *tx_buf;
263		struct rte_mbuf *mbuf;
264
265		tx_buf = &txr->tx_buf_ring[cons];
266		cons = RING_NEXT(txr->tx_ring_struct, cons);
267		mbuf = tx_buf->mbuf;
268		tx_buf->mbuf = NULL;
269
270		/* EW - no need to unmap DMA memory? */
271
272		for (j = 1; j < tx_buf->nr_bds; j++)
273			cons = RING_NEXT(txr->tx_ring_struct, cons);
274		rte_pktmbuf_free(mbuf);
275	}
276
277	txr->tx_cons = cons;
278}
279
280static int bnxt_handle_tx_cp(struct bnxt_tx_queue *txq)
281{
282	struct bnxt_cp_ring_info *cpr = txq->cp_ring;
283	uint32_t raw_cons = cpr->cp_raw_cons;
284	uint32_t cons;
285	int nb_tx_pkts = 0;
286	struct tx_cmpl *txcmp;
287
288	if ((txq->tx_ring->tx_ring_struct->ring_size -
289			(bnxt_tx_avail(txq->tx_ring))) >
290			txq->tx_free_thresh) {
291		while (1) {
292			cons = RING_CMP(cpr->cp_ring_struct, raw_cons);
293			txcmp = (struct tx_cmpl *)&cpr->cp_desc_ring[cons];
294
295			if (!CMP_VALID(txcmp, raw_cons, cpr->cp_ring_struct))
296				break;
297
298			if (CMP_TYPE(txcmp) == TX_CMPL_TYPE_TX_L2)
299				nb_tx_pkts++;
300			else
301				RTE_LOG(DEBUG, PMD,
302						"Unhandled CMP type %02x\n",
303						CMP_TYPE(txcmp));
304			raw_cons = NEXT_RAW_CMP(raw_cons);
305		}
306		if (nb_tx_pkts)
307			bnxt_tx_cmp(txq, nb_tx_pkts);
308		cpr->cp_raw_cons = raw_cons;
309		B_CP_DIS_DB(cpr, cpr->cp_raw_cons);
310	}
311	return nb_tx_pkts;
312}
313
314uint16_t bnxt_xmit_pkts(void *tx_queue, struct rte_mbuf **tx_pkts,
315			       uint16_t nb_pkts)
316{
317	struct bnxt_tx_queue *txq = tx_queue;
318	uint16_t nb_tx_pkts = 0;
319	uint16_t db_mask = txq->tx_ring->tx_ring_struct->ring_size >> 2;
320	uint16_t last_db_mask = 0;
321
322	/* Handle TX completions */
323	bnxt_handle_tx_cp(txq);
324
325	/* Handle TX burst request */
326	for (nb_tx_pkts = 0; nb_tx_pkts < nb_pkts; nb_tx_pkts++) {
327		if (bnxt_start_xmit(tx_pkts[nb_tx_pkts], txq)) {
328			break;
329		} else if ((nb_tx_pkts & db_mask) != last_db_mask) {
330			B_TX_DB(txq->tx_ring->tx_doorbell,
331					txq->tx_ring->tx_prod);
332			last_db_mask = nb_tx_pkts & db_mask;
333		}
334	}
335	if (nb_tx_pkts)
336		B_TX_DB(txq->tx_ring->tx_doorbell, txq->tx_ring->tx_prod);
337
338	return nb_tx_pkts;
339}
340