1 // SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
2 /*
3 * Copyright (C) 2017 Intel Deutschland GmbH
4 * Copyright (C) 2018-2020 Intel Corporation
5 */
6 #include <net/tso.h>
7 #include <linux/tcp.h>
8
9 #include "iwl-debug.h"
10 #include "iwl-csr.h"
11 #include "iwl-io.h"
12 #include "internal.h"
13 #include "fw/api/tx.h"
14 #include "queue/tx.h"
15
16 /*************** HOST COMMAND QUEUE FUNCTIONS *****/
17
18 /*
19 * iwl_pcie_gen2_enqueue_hcmd - enqueue a uCode command
20 * @priv: device private data point
21 * @cmd: a pointer to the ucode command structure
22 *
23 * The function returns < 0 values to indicate the operation
24 * failed. On success, it returns the index (>= 0) of command in the
25 * command queue.
26 */
iwl_pcie_gen2_enqueue_hcmd(struct iwl_trans * trans,struct iwl_host_cmd * cmd)27 int iwl_pcie_gen2_enqueue_hcmd(struct iwl_trans *trans,
28 struct iwl_host_cmd *cmd)
29 {
30 struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
31 struct iwl_txq *txq = trans->txqs.txq[trans->txqs.cmd.q_id];
32 struct iwl_device_cmd *out_cmd;
33 struct iwl_cmd_meta *out_meta;
34 void *dup_buf = NULL;
35 dma_addr_t phys_addr;
36 int i, cmd_pos, idx;
37 u16 copy_size, cmd_size, tb0_size;
38 bool had_nocopy = false;
39 u8 group_id = iwl_cmd_groupid(cmd->id);
40 const u8 *cmddata[IWL_MAX_CMD_TBS_PER_TFD];
41 u16 cmdlen[IWL_MAX_CMD_TBS_PER_TFD];
42 struct iwl_tfh_tfd *tfd;
43 unsigned long flags;
44
45 copy_size = sizeof(struct iwl_cmd_header_wide);
46 cmd_size = sizeof(struct iwl_cmd_header_wide);
47
48 for (i = 0; i < IWL_MAX_CMD_TBS_PER_TFD; i++) {
49 cmddata[i] = cmd->data[i];
50 cmdlen[i] = cmd->len[i];
51
52 if (!cmd->len[i])
53 continue;
54
55 /* need at least IWL_FIRST_TB_SIZE copied */
56 if (copy_size < IWL_FIRST_TB_SIZE) {
57 int copy = IWL_FIRST_TB_SIZE - copy_size;
58
59 if (copy > cmdlen[i])
60 copy = cmdlen[i];
61 cmdlen[i] -= copy;
62 cmddata[i] += copy;
63 copy_size += copy;
64 }
65
66 if (cmd->dataflags[i] & IWL_HCMD_DFL_NOCOPY) {
67 had_nocopy = true;
68 if (WARN_ON(cmd->dataflags[i] & IWL_HCMD_DFL_DUP)) {
69 idx = -EINVAL;
70 goto free_dup_buf;
71 }
72 } else if (cmd->dataflags[i] & IWL_HCMD_DFL_DUP) {
73 /*
74 * This is also a chunk that isn't copied
75 * to the static buffer so set had_nocopy.
76 */
77 had_nocopy = true;
78
79 /* only allowed once */
80 if (WARN_ON(dup_buf)) {
81 idx = -EINVAL;
82 goto free_dup_buf;
83 }
84
85 dup_buf = kmemdup(cmddata[i], cmdlen[i],
86 GFP_ATOMIC);
87 if (!dup_buf)
88 return -ENOMEM;
89 } else {
90 /* NOCOPY must not be followed by normal! */
91 if (WARN_ON(had_nocopy)) {
92 idx = -EINVAL;
93 goto free_dup_buf;
94 }
95 copy_size += cmdlen[i];
96 }
97 cmd_size += cmd->len[i];
98 }
99
100 /*
101 * If any of the command structures end up being larger than the
102 * TFD_MAX_PAYLOAD_SIZE and they aren't dynamically allocated into
103 * separate TFDs, then we will need to increase the size of the buffers
104 */
105 if (WARN(copy_size > TFD_MAX_PAYLOAD_SIZE,
106 "Command %s (%#x) is too large (%d bytes)\n",
107 iwl_get_cmd_string(trans, cmd->id), cmd->id, copy_size)) {
108 idx = -EINVAL;
109 goto free_dup_buf;
110 }
111
112 spin_lock_irqsave(&txq->lock, flags);
113
114 idx = iwl_txq_get_cmd_index(txq, txq->write_ptr);
115 tfd = iwl_txq_get_tfd(trans, txq, txq->write_ptr);
116 memset(tfd, 0, sizeof(*tfd));
117
118 if (iwl_txq_space(trans, txq) < ((cmd->flags & CMD_ASYNC) ? 2 : 1)) {
119 spin_unlock_irqrestore(&txq->lock, flags);
120
121 IWL_ERR(trans, "No space in command queue\n");
122 iwl_op_mode_cmd_queue_full(trans->op_mode);
123 idx = -ENOSPC;
124 goto free_dup_buf;
125 }
126
127 out_cmd = txq->entries[idx].cmd;
128 out_meta = &txq->entries[idx].meta;
129
130 /* re-initialize to NULL */
131 memset(out_meta, 0, sizeof(*out_meta));
132 if (cmd->flags & CMD_WANT_SKB)
133 out_meta->source = cmd;
134
135 /* set up the header */
136 out_cmd->hdr_wide.cmd = iwl_cmd_opcode(cmd->id);
137 out_cmd->hdr_wide.group_id = group_id;
138 out_cmd->hdr_wide.version = iwl_cmd_version(cmd->id);
139 out_cmd->hdr_wide.length =
140 cpu_to_le16(cmd_size - sizeof(struct iwl_cmd_header_wide));
141 out_cmd->hdr_wide.reserved = 0;
142 out_cmd->hdr_wide.sequence =
143 cpu_to_le16(QUEUE_TO_SEQ(trans->txqs.cmd.q_id) |
144 INDEX_TO_SEQ(txq->write_ptr));
145
146 cmd_pos = sizeof(struct iwl_cmd_header_wide);
147 copy_size = sizeof(struct iwl_cmd_header_wide);
148
149 /* and copy the data that needs to be copied */
150 for (i = 0; i < IWL_MAX_CMD_TBS_PER_TFD; i++) {
151 int copy;
152
153 if (!cmd->len[i])
154 continue;
155
156 /* copy everything if not nocopy/dup */
157 if (!(cmd->dataflags[i] & (IWL_HCMD_DFL_NOCOPY |
158 IWL_HCMD_DFL_DUP))) {
159 copy = cmd->len[i];
160
161 memcpy((u8 *)out_cmd + cmd_pos, cmd->data[i], copy);
162 cmd_pos += copy;
163 copy_size += copy;
164 continue;
165 }
166
167 /*
168 * Otherwise we need at least IWL_FIRST_TB_SIZE copied
169 * in total (for bi-directional DMA), but copy up to what
170 * we can fit into the payload for debug dump purposes.
171 */
172 copy = min_t(int, TFD_MAX_PAYLOAD_SIZE - cmd_pos, cmd->len[i]);
173
174 memcpy((u8 *)out_cmd + cmd_pos, cmd->data[i], copy);
175 cmd_pos += copy;
176
177 /* However, treat copy_size the proper way, we need it below */
178 if (copy_size < IWL_FIRST_TB_SIZE) {
179 copy = IWL_FIRST_TB_SIZE - copy_size;
180
181 if (copy > cmd->len[i])
182 copy = cmd->len[i];
183 copy_size += copy;
184 }
185 }
186
187 IWL_DEBUG_HC(trans,
188 "Sending command %s (%.2x.%.2x), seq: 0x%04X, %d bytes at %d[%d]:%d\n",
189 iwl_get_cmd_string(trans, cmd->id), group_id,
190 out_cmd->hdr.cmd, le16_to_cpu(out_cmd->hdr.sequence),
191 cmd_size, txq->write_ptr, idx, trans->txqs.cmd.q_id);
192
193 /* start the TFD with the minimum copy bytes */
194 tb0_size = min_t(int, copy_size, IWL_FIRST_TB_SIZE);
195 memcpy(&txq->first_tb_bufs[idx], out_cmd, tb0_size);
196 iwl_txq_gen2_set_tb(trans, tfd, iwl_txq_get_first_tb_dma(txq, idx),
197 tb0_size);
198
199 /* map first command fragment, if any remains */
200 if (copy_size > tb0_size) {
201 phys_addr = dma_map_single(trans->dev,
202 (u8 *)out_cmd + tb0_size,
203 copy_size - tb0_size,
204 DMA_TO_DEVICE);
205 if (dma_mapping_error(trans->dev, phys_addr)) {
206 idx = -ENOMEM;
207 iwl_txq_gen2_tfd_unmap(trans, out_meta, tfd);
208 goto out;
209 }
210 iwl_txq_gen2_set_tb(trans, tfd, phys_addr,
211 copy_size - tb0_size);
212 }
213
214 /* map the remaining (adjusted) nocopy/dup fragments */
215 for (i = 0; i < IWL_MAX_CMD_TBS_PER_TFD; i++) {
216 void *data = (void *)(uintptr_t)cmddata[i];
217
218 if (!cmdlen[i])
219 continue;
220 if (!(cmd->dataflags[i] & (IWL_HCMD_DFL_NOCOPY |
221 IWL_HCMD_DFL_DUP)))
222 continue;
223 if (cmd->dataflags[i] & IWL_HCMD_DFL_DUP)
224 data = dup_buf;
225 phys_addr = dma_map_single(trans->dev, data,
226 cmdlen[i], DMA_TO_DEVICE);
227 if (dma_mapping_error(trans->dev, phys_addr)) {
228 idx = -ENOMEM;
229 iwl_txq_gen2_tfd_unmap(trans, out_meta, tfd);
230 goto out;
231 }
232 iwl_txq_gen2_set_tb(trans, tfd, phys_addr, cmdlen[i]);
233 }
234
235 BUILD_BUG_ON(IWL_TFH_NUM_TBS > sizeof(out_meta->tbs) * BITS_PER_BYTE);
236 out_meta->flags = cmd->flags;
237 if (WARN_ON_ONCE(txq->entries[idx].free_buf))
238 kfree_sensitive(txq->entries[idx].free_buf);
239 txq->entries[idx].free_buf = dup_buf;
240
241 trace_iwlwifi_dev_hcmd(trans->dev, cmd, cmd_size, &out_cmd->hdr_wide);
242
243 /* start timer if queue currently empty */
244 if (txq->read_ptr == txq->write_ptr && txq->wd_timeout)
245 mod_timer(&txq->stuck_timer, jiffies + txq->wd_timeout);
246
247 spin_lock(&trans_pcie->reg_lock);
248 /* Increment and update queue's write index */
249 txq->write_ptr = iwl_txq_inc_wrap(trans, txq->write_ptr);
250 iwl_txq_inc_wr_ptr(trans, txq);
251 spin_unlock(&trans_pcie->reg_lock);
252
253 out:
254 spin_unlock_irqrestore(&txq->lock, flags);
255 free_dup_buf:
256 if (idx < 0)
257 kfree(dup_buf);
258 return idx;
259 }
260