Loading...
1// SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
2/*
3 * Copyright(c) 2017 - 2018 Intel Corporation.
4 */
5
6/*
7 * This file contains HFI1 support for VNIC SDMA functionality
8 */
9
10#include "sdma.h"
11#include "vnic.h"
12
13#define HFI1_VNIC_SDMA_Q_ACTIVE BIT(0)
14#define HFI1_VNIC_SDMA_Q_DEFERRED BIT(1)
15
16#define HFI1_VNIC_TXREQ_NAME_LEN 32
17#define HFI1_VNIC_SDMA_DESC_WTRMRK 64
18
19/*
20 * struct vnic_txreq - VNIC transmit descriptor
21 * @txreq: sdma transmit request
22 * @sdma: vnic sdma pointer
23 * @skb: skb to send
24 * @pad: pad buffer
25 * @plen: pad length
26 * @pbc_val: pbc value
27 */
28struct vnic_txreq {
29 struct sdma_txreq txreq;
30 struct hfi1_vnic_sdma *sdma;
31
32 struct sk_buff *skb;
33 unsigned char pad[HFI1_VNIC_MAX_PAD];
34 u16 plen;
35 __le64 pbc_val;
36};
37
38static void vnic_sdma_complete(struct sdma_txreq *txreq,
39 int status)
40{
41 struct vnic_txreq *tx = container_of(txreq, struct vnic_txreq, txreq);
42 struct hfi1_vnic_sdma *vnic_sdma = tx->sdma;
43
44 sdma_txclean(vnic_sdma->dd, txreq);
45 dev_kfree_skb_any(tx->skb);
46 kmem_cache_free(vnic_sdma->dd->vnic.txreq_cache, tx);
47}
48
49static noinline int build_vnic_ulp_payload(struct sdma_engine *sde,
50 struct vnic_txreq *tx)
51{
52 int i, ret = 0;
53
54 ret = sdma_txadd_kvaddr(
55 sde->dd,
56 &tx->txreq,
57 tx->skb->data,
58 skb_headlen(tx->skb));
59 if (unlikely(ret))
60 goto bail_txadd;
61
62 for (i = 0; i < skb_shinfo(tx->skb)->nr_frags; i++) {
63 skb_frag_t *frag = &skb_shinfo(tx->skb)->frags[i];
64
65 /* combine physically continuous fragments later? */
66 ret = sdma_txadd_page(sde->dd,
67 &tx->txreq,
68 skb_frag_page(frag),
69 skb_frag_off(frag),
70 skb_frag_size(frag),
71 NULL, NULL, NULL);
72 if (unlikely(ret))
73 goto bail_txadd;
74 }
75
76 if (tx->plen)
77 ret = sdma_txadd_kvaddr(sde->dd, &tx->txreq,
78 tx->pad + HFI1_VNIC_MAX_PAD - tx->plen,
79 tx->plen);
80
81bail_txadd:
82 return ret;
83}
84
85static int build_vnic_tx_desc(struct sdma_engine *sde,
86 struct vnic_txreq *tx,
87 u64 pbc)
88{
89 int ret = 0;
90 u16 hdrbytes = 2 << 2; /* PBC */
91
92 ret = sdma_txinit_ahg(
93 &tx->txreq,
94 0,
95 hdrbytes + tx->skb->len + tx->plen,
96 0,
97 0,
98 NULL,
99 0,
100 vnic_sdma_complete);
101 if (unlikely(ret))
102 goto bail_txadd;
103
104 /* add pbc */
105 tx->pbc_val = cpu_to_le64(pbc);
106 ret = sdma_txadd_kvaddr(
107 sde->dd,
108 &tx->txreq,
109 &tx->pbc_val,
110 hdrbytes);
111 if (unlikely(ret))
112 goto bail_txadd;
113
114 /* add the ulp payload */
115 ret = build_vnic_ulp_payload(sde, tx);
116bail_txadd:
117 return ret;
118}
119
120/* setup the last plen bypes of pad */
121static inline void hfi1_vnic_update_pad(unsigned char *pad, u8 plen)
122{
123 pad[HFI1_VNIC_MAX_PAD - 1] = plen - OPA_VNIC_ICRC_TAIL_LEN;
124}
125
126int hfi1_vnic_send_dma(struct hfi1_devdata *dd, u8 q_idx,
127 struct hfi1_vnic_vport_info *vinfo,
128 struct sk_buff *skb, u64 pbc, u8 plen)
129{
130 struct hfi1_vnic_sdma *vnic_sdma = &vinfo->sdma[q_idx];
131 struct sdma_engine *sde = vnic_sdma->sde;
132 struct vnic_txreq *tx;
133 int ret = -ECOMM;
134
135 if (unlikely(READ_ONCE(vnic_sdma->state) != HFI1_VNIC_SDMA_Q_ACTIVE))
136 goto tx_err;
137
138 if (unlikely(!sde || !sdma_running(sde)))
139 goto tx_err;
140
141 tx = kmem_cache_alloc(dd->vnic.txreq_cache, GFP_ATOMIC);
142 if (unlikely(!tx)) {
143 ret = -ENOMEM;
144 goto tx_err;
145 }
146
147 tx->sdma = vnic_sdma;
148 tx->skb = skb;
149 hfi1_vnic_update_pad(tx->pad, plen);
150 tx->plen = plen;
151 ret = build_vnic_tx_desc(sde, tx, pbc);
152 if (unlikely(ret))
153 goto free_desc;
154
155 ret = sdma_send_txreq(sde, iowait_get_ib_work(&vnic_sdma->wait),
156 &tx->txreq, vnic_sdma->pkts_sent);
157 /* When -ECOMM, sdma callback will be called with ABORT status */
158 if (unlikely(ret && unlikely(ret != -ECOMM)))
159 goto free_desc;
160
161 if (!ret) {
162 vnic_sdma->pkts_sent = true;
163 iowait_starve_clear(vnic_sdma->pkts_sent, &vnic_sdma->wait);
164 }
165 return ret;
166
167free_desc:
168 sdma_txclean(dd, &tx->txreq);
169 kmem_cache_free(dd->vnic.txreq_cache, tx);
170tx_err:
171 if (ret != -EBUSY)
172 dev_kfree_skb_any(skb);
173 else
174 vnic_sdma->pkts_sent = false;
175 return ret;
176}
177
178/*
179 * hfi1_vnic_sdma_sleep - vnic sdma sleep function
180 *
181 * This function gets called from sdma_send_txreq() when there are not enough
182 * sdma descriptors available to send the packet. It adds Tx queue's wait
183 * structure to sdma engine's dmawait list to be woken up when descriptors
184 * become available.
185 */
186static int hfi1_vnic_sdma_sleep(struct sdma_engine *sde,
187 struct iowait_work *wait,
188 struct sdma_txreq *txreq,
189 uint seq,
190 bool pkts_sent)
191{
192 struct hfi1_vnic_sdma *vnic_sdma =
193 container_of(wait->iow, struct hfi1_vnic_sdma, wait);
194
195 write_seqlock(&sde->waitlock);
196 if (sdma_progress(sde, seq, txreq)) {
197 write_sequnlock(&sde->waitlock);
198 return -EAGAIN;
199 }
200
201 vnic_sdma->state = HFI1_VNIC_SDMA_Q_DEFERRED;
202 if (list_empty(&vnic_sdma->wait.list)) {
203 iowait_get_priority(wait->iow);
204 iowait_queue(pkts_sent, wait->iow, &sde->dmawait);
205 }
206 write_sequnlock(&sde->waitlock);
207 return -EBUSY;
208}
209
210/*
211 * hfi1_vnic_sdma_wakeup - vnic sdma wakeup function
212 *
213 * This function gets called when SDMA descriptors becomes available and Tx
214 * queue's wait structure was previously added to sdma engine's dmawait list.
215 * It notifies the upper driver about Tx queue wakeup.
216 */
217static void hfi1_vnic_sdma_wakeup(struct iowait *wait, int reason)
218{
219 struct hfi1_vnic_sdma *vnic_sdma =
220 container_of(wait, struct hfi1_vnic_sdma, wait);
221 struct hfi1_vnic_vport_info *vinfo = vnic_sdma->vinfo;
222
223 vnic_sdma->state = HFI1_VNIC_SDMA_Q_ACTIVE;
224 if (__netif_subqueue_stopped(vinfo->netdev, vnic_sdma->q_idx))
225 netif_wake_subqueue(vinfo->netdev, vnic_sdma->q_idx);
226};
227
228inline bool hfi1_vnic_sdma_write_avail(struct hfi1_vnic_vport_info *vinfo,
229 u8 q_idx)
230{
231 struct hfi1_vnic_sdma *vnic_sdma = &vinfo->sdma[q_idx];
232
233 return (READ_ONCE(vnic_sdma->state) == HFI1_VNIC_SDMA_Q_ACTIVE);
234}
235
236void hfi1_vnic_sdma_init(struct hfi1_vnic_vport_info *vinfo)
237{
238 int i;
239
240 for (i = 0; i < vinfo->num_tx_q; i++) {
241 struct hfi1_vnic_sdma *vnic_sdma = &vinfo->sdma[i];
242
243 iowait_init(&vnic_sdma->wait, 0, NULL, NULL,
244 hfi1_vnic_sdma_sleep,
245 hfi1_vnic_sdma_wakeup, NULL, NULL);
246 vnic_sdma->sde = &vinfo->dd->per_sdma[i];
247 vnic_sdma->dd = vinfo->dd;
248 vnic_sdma->vinfo = vinfo;
249 vnic_sdma->q_idx = i;
250 vnic_sdma->state = HFI1_VNIC_SDMA_Q_ACTIVE;
251
252 /* Add a free descriptor watermark for wakeups */
253 if (vnic_sdma->sde->descq_cnt > HFI1_VNIC_SDMA_DESC_WTRMRK) {
254 struct iowait_work *work;
255
256 INIT_LIST_HEAD(&vnic_sdma->stx.list);
257 vnic_sdma->stx.num_desc = HFI1_VNIC_SDMA_DESC_WTRMRK;
258 work = iowait_get_ib_work(&vnic_sdma->wait);
259 list_add_tail(&vnic_sdma->stx.list, &work->tx_head);
260 }
261 }
262}
263
264int hfi1_vnic_txreq_init(struct hfi1_devdata *dd)
265{
266 char buf[HFI1_VNIC_TXREQ_NAME_LEN];
267
268 snprintf(buf, sizeof(buf), "hfi1_%u_vnic_txreq_cache", dd->unit);
269 dd->vnic.txreq_cache = kmem_cache_create(buf,
270 sizeof(struct vnic_txreq),
271 0, SLAB_HWCACHE_ALIGN,
272 NULL);
273 if (!dd->vnic.txreq_cache)
274 return -ENOMEM;
275 return 0;
276}
277
278void hfi1_vnic_txreq_deinit(struct hfi1_devdata *dd)
279{
280 kmem_cache_destroy(dd->vnic.txreq_cache);
281 dd->vnic.txreq_cache = NULL;
282}
1/*
2 * Copyright(c) 2017 - 2018 Intel Corporation.
3 *
4 * This file is provided under a dual BSD/GPLv2 license. When using or
5 * redistributing this file, you may do so under either license.
6 *
7 * GPL LICENSE SUMMARY
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of version 2 of the GNU General Public License as
11 * published by the Free Software Foundation.
12 *
13 * This program is distributed in the hope that it will be useful, but
14 * WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * General Public License for more details.
17 *
18 * BSD LICENSE
19 *
20 * Redistribution and use in source and binary forms, with or without
21 * modification, are permitted provided that the following conditions
22 * are met:
23 *
24 * - Redistributions of source code must retain the above copyright
25 * notice, this list of conditions and the following disclaimer.
26 * - Redistributions in binary form must reproduce the above copyright
27 * notice, this list of conditions and the following disclaimer in
28 * the documentation and/or other materials provided with the
29 * distribution.
30 * - Neither the name of Intel Corporation nor the names of its
31 * contributors may be used to endorse or promote products derived
32 * from this software without specific prior written permission.
33 *
34 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
35 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
36 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
37 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
38 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
39 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
40 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
41 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
42 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
43 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
44 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
45 *
46 */
47
48/*
49 * This file contains HFI1 support for VNIC SDMA functionality
50 */
51
52#include "sdma.h"
53#include "vnic.h"
54
55#define HFI1_VNIC_SDMA_Q_ACTIVE BIT(0)
56#define HFI1_VNIC_SDMA_Q_DEFERRED BIT(1)
57
58#define HFI1_VNIC_TXREQ_NAME_LEN 32
59#define HFI1_VNIC_SDMA_DESC_WTRMRK 64
60
61/*
62 * struct vnic_txreq - VNIC transmit descriptor
63 * @txreq: sdma transmit request
64 * @sdma: vnic sdma pointer
65 * @skb: skb to send
66 * @pad: pad buffer
67 * @plen: pad length
68 * @pbc_val: pbc value
69 */
70struct vnic_txreq {
71 struct sdma_txreq txreq;
72 struct hfi1_vnic_sdma *sdma;
73
74 struct sk_buff *skb;
75 unsigned char pad[HFI1_VNIC_MAX_PAD];
76 u16 plen;
77 __le64 pbc_val;
78};
79
80static void vnic_sdma_complete(struct sdma_txreq *txreq,
81 int status)
82{
83 struct vnic_txreq *tx = container_of(txreq, struct vnic_txreq, txreq);
84 struct hfi1_vnic_sdma *vnic_sdma = tx->sdma;
85
86 sdma_txclean(vnic_sdma->dd, txreq);
87 dev_kfree_skb_any(tx->skb);
88 kmem_cache_free(vnic_sdma->dd->vnic.txreq_cache, tx);
89}
90
91static noinline int build_vnic_ulp_payload(struct sdma_engine *sde,
92 struct vnic_txreq *tx)
93{
94 int i, ret = 0;
95
96 ret = sdma_txadd_kvaddr(
97 sde->dd,
98 &tx->txreq,
99 tx->skb->data,
100 skb_headlen(tx->skb));
101 if (unlikely(ret))
102 goto bail_txadd;
103
104 for (i = 0; i < skb_shinfo(tx->skb)->nr_frags; i++) {
105 skb_frag_t *frag = &skb_shinfo(tx->skb)->frags[i];
106
107 /* combine physically continuous fragments later? */
108 ret = sdma_txadd_page(sde->dd,
109 &tx->txreq,
110 skb_frag_page(frag),
111 skb_frag_off(frag),
112 skb_frag_size(frag));
113 if (unlikely(ret))
114 goto bail_txadd;
115 }
116
117 if (tx->plen)
118 ret = sdma_txadd_kvaddr(sde->dd, &tx->txreq,
119 tx->pad + HFI1_VNIC_MAX_PAD - tx->plen,
120 tx->plen);
121
122bail_txadd:
123 return ret;
124}
125
126static int build_vnic_tx_desc(struct sdma_engine *sde,
127 struct vnic_txreq *tx,
128 u64 pbc)
129{
130 int ret = 0;
131 u16 hdrbytes = 2 << 2; /* PBC */
132
133 ret = sdma_txinit_ahg(
134 &tx->txreq,
135 0,
136 hdrbytes + tx->skb->len + tx->plen,
137 0,
138 0,
139 NULL,
140 0,
141 vnic_sdma_complete);
142 if (unlikely(ret))
143 goto bail_txadd;
144
145 /* add pbc */
146 tx->pbc_val = cpu_to_le64(pbc);
147 ret = sdma_txadd_kvaddr(
148 sde->dd,
149 &tx->txreq,
150 &tx->pbc_val,
151 hdrbytes);
152 if (unlikely(ret))
153 goto bail_txadd;
154
155 /* add the ulp payload */
156 ret = build_vnic_ulp_payload(sde, tx);
157bail_txadd:
158 return ret;
159}
160
161/* setup the last plen bypes of pad */
162static inline void hfi1_vnic_update_pad(unsigned char *pad, u8 plen)
163{
164 pad[HFI1_VNIC_MAX_PAD - 1] = plen - OPA_VNIC_ICRC_TAIL_LEN;
165}
166
167int hfi1_vnic_send_dma(struct hfi1_devdata *dd, u8 q_idx,
168 struct hfi1_vnic_vport_info *vinfo,
169 struct sk_buff *skb, u64 pbc, u8 plen)
170{
171 struct hfi1_vnic_sdma *vnic_sdma = &vinfo->sdma[q_idx];
172 struct sdma_engine *sde = vnic_sdma->sde;
173 struct vnic_txreq *tx;
174 int ret = -ECOMM;
175
176 if (unlikely(READ_ONCE(vnic_sdma->state) != HFI1_VNIC_SDMA_Q_ACTIVE))
177 goto tx_err;
178
179 if (unlikely(!sde || !sdma_running(sde)))
180 goto tx_err;
181
182 tx = kmem_cache_alloc(dd->vnic.txreq_cache, GFP_ATOMIC);
183 if (unlikely(!tx)) {
184 ret = -ENOMEM;
185 goto tx_err;
186 }
187
188 tx->sdma = vnic_sdma;
189 tx->skb = skb;
190 hfi1_vnic_update_pad(tx->pad, plen);
191 tx->plen = plen;
192 ret = build_vnic_tx_desc(sde, tx, pbc);
193 if (unlikely(ret))
194 goto free_desc;
195
196 ret = sdma_send_txreq(sde, iowait_get_ib_work(&vnic_sdma->wait),
197 &tx->txreq, vnic_sdma->pkts_sent);
198 /* When -ECOMM, sdma callback will be called with ABORT status */
199 if (unlikely(ret && unlikely(ret != -ECOMM)))
200 goto free_desc;
201
202 if (!ret) {
203 vnic_sdma->pkts_sent = true;
204 iowait_starve_clear(vnic_sdma->pkts_sent, &vnic_sdma->wait);
205 }
206 return ret;
207
208free_desc:
209 sdma_txclean(dd, &tx->txreq);
210 kmem_cache_free(dd->vnic.txreq_cache, tx);
211tx_err:
212 if (ret != -EBUSY)
213 dev_kfree_skb_any(skb);
214 else
215 vnic_sdma->pkts_sent = false;
216 return ret;
217}
218
219/*
220 * hfi1_vnic_sdma_sleep - vnic sdma sleep function
221 *
222 * This function gets called from sdma_send_txreq() when there are not enough
223 * sdma descriptors available to send the packet. It adds Tx queue's wait
224 * structure to sdma engine's dmawait list to be woken up when descriptors
225 * become available.
226 */
227static int hfi1_vnic_sdma_sleep(struct sdma_engine *sde,
228 struct iowait_work *wait,
229 struct sdma_txreq *txreq,
230 uint seq,
231 bool pkts_sent)
232{
233 struct hfi1_vnic_sdma *vnic_sdma =
234 container_of(wait->iow, struct hfi1_vnic_sdma, wait);
235
236 write_seqlock(&sde->waitlock);
237 if (sdma_progress(sde, seq, txreq)) {
238 write_sequnlock(&sde->waitlock);
239 return -EAGAIN;
240 }
241
242 vnic_sdma->state = HFI1_VNIC_SDMA_Q_DEFERRED;
243 if (list_empty(&vnic_sdma->wait.list)) {
244 iowait_get_priority(wait->iow);
245 iowait_queue(pkts_sent, wait->iow, &sde->dmawait);
246 }
247 write_sequnlock(&sde->waitlock);
248 return -EBUSY;
249}
250
251/*
252 * hfi1_vnic_sdma_wakeup - vnic sdma wakeup function
253 *
254 * This function gets called when SDMA descriptors becomes available and Tx
255 * queue's wait structure was previously added to sdma engine's dmawait list.
256 * It notifies the upper driver about Tx queue wakeup.
257 */
258static void hfi1_vnic_sdma_wakeup(struct iowait *wait, int reason)
259{
260 struct hfi1_vnic_sdma *vnic_sdma =
261 container_of(wait, struct hfi1_vnic_sdma, wait);
262 struct hfi1_vnic_vport_info *vinfo = vnic_sdma->vinfo;
263
264 vnic_sdma->state = HFI1_VNIC_SDMA_Q_ACTIVE;
265 if (__netif_subqueue_stopped(vinfo->netdev, vnic_sdma->q_idx))
266 netif_wake_subqueue(vinfo->netdev, vnic_sdma->q_idx);
267};
268
269inline bool hfi1_vnic_sdma_write_avail(struct hfi1_vnic_vport_info *vinfo,
270 u8 q_idx)
271{
272 struct hfi1_vnic_sdma *vnic_sdma = &vinfo->sdma[q_idx];
273
274 return (READ_ONCE(vnic_sdma->state) == HFI1_VNIC_SDMA_Q_ACTIVE);
275}
276
277void hfi1_vnic_sdma_init(struct hfi1_vnic_vport_info *vinfo)
278{
279 int i;
280
281 for (i = 0; i < vinfo->num_tx_q; i++) {
282 struct hfi1_vnic_sdma *vnic_sdma = &vinfo->sdma[i];
283
284 iowait_init(&vnic_sdma->wait, 0, NULL, NULL,
285 hfi1_vnic_sdma_sleep,
286 hfi1_vnic_sdma_wakeup, NULL, NULL);
287 vnic_sdma->sde = &vinfo->dd->per_sdma[i];
288 vnic_sdma->dd = vinfo->dd;
289 vnic_sdma->vinfo = vinfo;
290 vnic_sdma->q_idx = i;
291 vnic_sdma->state = HFI1_VNIC_SDMA_Q_ACTIVE;
292
293 /* Add a free descriptor watermark for wakeups */
294 if (vnic_sdma->sde->descq_cnt > HFI1_VNIC_SDMA_DESC_WTRMRK) {
295 struct iowait_work *work;
296
297 INIT_LIST_HEAD(&vnic_sdma->stx.list);
298 vnic_sdma->stx.num_desc = HFI1_VNIC_SDMA_DESC_WTRMRK;
299 work = iowait_get_ib_work(&vnic_sdma->wait);
300 list_add_tail(&vnic_sdma->stx.list, &work->tx_head);
301 }
302 }
303}
304
305int hfi1_vnic_txreq_init(struct hfi1_devdata *dd)
306{
307 char buf[HFI1_VNIC_TXREQ_NAME_LEN];
308
309 snprintf(buf, sizeof(buf), "hfi1_%u_vnic_txreq_cache", dd->unit);
310 dd->vnic.txreq_cache = kmem_cache_create(buf,
311 sizeof(struct vnic_txreq),
312 0, SLAB_HWCACHE_ALIGN,
313 NULL);
314 if (!dd->vnic.txreq_cache)
315 return -ENOMEM;
316 return 0;
317}
318
319void hfi1_vnic_txreq_deinit(struct hfi1_devdata *dd)
320{
321 kmem_cache_destroy(dd->vnic.txreq_cache);
322 dd->vnic.txreq_cache = NULL;
323}