tx-gen2.c (7389B)
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 */ 27int 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 253out: 254 spin_unlock_irqrestore(&txq->lock, flags); 255free_dup_buf: 256 if (idx < 0) 257 kfree(dup_buf); 258 return idx; 259}