1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 3 * 4 * Copyright (c) 2015-2021 Amazon.com, Inc. or its affiliates. 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 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 19 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 20 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 21 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 22 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 23 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 24 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 28 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 29 * 30 * $FreeBSD$ 31 * 32 */ 33 34 #include <sys/cdefs.h> 35 __FBSDID("$FreeBSD$"); 36 37 #include "opt_rss.h" 38 39 #include "ena_rss.h" 40 41 /* 42 * This function should generate unique key for the whole driver. 43 * If the key was already genereated in the previous call (for example 44 * for another adapter), then it should be returned instead. 45 */ 46 void 47 ena_rss_key_fill(void *key, size_t size) 48 { 49 static bool key_generated; 50 static uint8_t default_key[ENA_HASH_KEY_SIZE]; 51 52 KASSERT(size <= ENA_HASH_KEY_SIZE, ("Requested more bytes than ENA RSS key can hold")); 53 54 if (!key_generated) { 55 arc4random_buf(default_key, ENA_HASH_KEY_SIZE); 56 key_generated = true; 57 } 58 59 memcpy(key, default_key, size); 60 } 61 62 /* 63 * ENA HW expects the key to be in reverse-byte order. 64 */ 65 static void 66 ena_rss_reorder_hash_key(u8 *reordered_key, const u8 *key, size_t key_size) 67 { 68 int i; 69 70 key = key + key_size - 1; 71 72 for (i = 0; i < key_size; ++i) 73 *reordered_key++ = *key--; 74 } 75 76 int ena_rss_set_hash(struct ena_com_dev *ena_dev, const u8 *key) 77 { 78 enum ena_admin_hash_functions ena_func = ENA_ADMIN_TOEPLITZ; 79 u8 hw_key[ENA_HASH_KEY_SIZE]; 80 81 ena_rss_reorder_hash_key(hw_key, key, ENA_HASH_KEY_SIZE); 82 83 return (ena_com_fill_hash_function(ena_dev, ena_func, hw_key, 84 ENA_HASH_KEY_SIZE, 0x0)); 85 } 86 87 int ena_rss_get_hash_key(struct ena_com_dev *ena_dev, u8 *key) 88 { 89 u8 hw_key[ENA_HASH_KEY_SIZE]; 90 int rc; 91 92 rc = ena_com_get_hash_key(ena_dev, hw_key); 93 if (rc != 0) 94 return rc; 95 96 ena_rss_reorder_hash_key(key, hw_key, ENA_HASH_KEY_SIZE); 97 98 return (0); 99 } 100 101 static int 102 ena_rss_init_default(struct ena_adapter *adapter) 103 { 104 struct ena_com_dev *ena_dev = adapter->ena_dev; 105 device_t dev = adapter->pdev; 106 int qid, rc, i; 107 108 rc = ena_com_rss_init(ena_dev, ENA_RX_RSS_TABLE_LOG_SIZE); 109 if (unlikely(rc != 0)) { 110 ena_log(dev, ERR, "Cannot init indirect table\n"); 111 return (rc); 112 } 113 114 for (i = 0; i < ENA_RX_RSS_TABLE_SIZE; i++) { 115 #ifdef RSS 116 qid = rss_get_indirection_to_bucket(i) % adapter->num_io_queues; 117 #else 118 qid = i % adapter->num_io_queues; 119 #endif 120 rc = ena_com_indirect_table_fill_entry(ena_dev, i, 121 ENA_IO_RXQ_IDX(qid)); 122 if (unlikely((rc != 0) && (rc != EOPNOTSUPP))) { 123 ena_log(dev, ERR, "Cannot fill indirect table\n"); 124 goto err_rss_destroy; 125 } 126 } 127 128 129 #ifdef RSS 130 uint8_t rss_algo = rss_gethashalgo(); 131 if (rss_algo == RSS_HASH_TOEPLITZ) { 132 uint8_t hash_key[RSS_KEYSIZE]; 133 134 rss_getkey(hash_key); 135 rc = ena_rss_set_hash(ena_dev, hash_key); 136 } else 137 #endif 138 rc = ena_com_fill_hash_function(ena_dev, ENA_ADMIN_TOEPLITZ, NULL, 139 ENA_HASH_KEY_SIZE, 0x0); 140 if (unlikely((rc != 0) && (rc != EOPNOTSUPP))) { 141 ena_log(dev, ERR, "Cannot fill hash function\n"); 142 goto err_rss_destroy; 143 } 144 145 rc = ena_com_set_default_hash_ctrl(ena_dev); 146 if (unlikely((rc != 0) && (rc != EOPNOTSUPP))) { 147 ena_log(dev, ERR, "Cannot fill hash control\n"); 148 goto err_rss_destroy; 149 } 150 151 rc = ena_rss_indir_init(adapter); 152 153 return (rc == EOPNOTSUPP ? 0 : rc); 154 155 err_rss_destroy: 156 ena_com_rss_destroy(ena_dev); 157 return (rc); 158 } 159 160 /* Configure the Rx forwarding */ 161 int 162 ena_rss_configure(struct ena_adapter *adapter) 163 { 164 struct ena_com_dev *ena_dev = adapter->ena_dev; 165 int rc; 166 167 /* In case the RSS table was destroyed */ 168 if (!ena_dev->rss.tbl_log_size) { 169 rc = ena_rss_init_default(adapter); 170 if (unlikely((rc != 0) && (rc != EOPNOTSUPP))) { 171 ena_log(adapter->pdev, ERR, 172 "WARNING: RSS was not properly re-initialized," 173 " it will affect bandwidth\n"); 174 ENA_FLAG_CLEAR_ATOMIC(ENA_FLAG_RSS_ACTIVE, adapter); 175 return (rc); 176 } 177 } 178 179 /* Set indirect table */ 180 rc = ena_com_indirect_table_set(ena_dev); 181 if (unlikely((rc != 0) && (rc != EOPNOTSUPP))) 182 return (rc); 183 184 /* Configure hash function (if supported) */ 185 rc = ena_com_set_hash_function(ena_dev); 186 if (unlikely((rc != 0) && (rc != EOPNOTSUPP))) 187 return (rc); 188 189 /* Configure hash inputs (if supported) */ 190 rc = ena_com_set_hash_ctrl(ena_dev); 191 if (unlikely((rc != 0) && (rc != EOPNOTSUPP))) 192 return (rc); 193 194 return (0); 195 } 196 197 static void 198 ena_rss_init_default_deferred(void *arg) 199 { 200 struct ena_adapter *adapter; 201 devclass_t dc; 202 int max; 203 int rc; 204 205 dc = devclass_find("ena"); 206 if (unlikely(dc == NULL)) { 207 ena_log_raw(ERR, "SYSINIT: %s: No devclass ena\n", __func__); 208 return; 209 } 210 211 max = devclass_get_maxunit(dc); 212 while (max-- >= 0) { 213 adapter = devclass_get_softc(dc, max); 214 if (adapter != NULL) { 215 rc = ena_rss_init_default(adapter); 216 ENA_FLAG_SET_ATOMIC(ENA_FLAG_RSS_ACTIVE, adapter); 217 if (unlikely(rc != 0)) { 218 ena_log(adapter->pdev, WARN, 219 "WARNING: RSS was not properly initialized," 220 " it will affect bandwidth\n"); 221 ENA_FLAG_CLEAR_ATOMIC(ENA_FLAG_RSS_ACTIVE, adapter); 222 } 223 } 224 } 225 } 226 SYSINIT(ena_rss_init, SI_SUB_KICK_SCHEDULER, SI_ORDER_SECOND, ena_rss_init_default_deferred, NULL); 227 228 int 229 ena_rss_indir_get(struct ena_adapter *adapter, uint32_t *table) 230 { 231 int rc, i; 232 233 rc = ena_com_indirect_table_get(adapter->ena_dev, table); 234 if (rc != 0) { 235 if (rc == EOPNOTSUPP) 236 device_printf(adapter->pdev, 237 "Reading from indirection table not supported\n"); 238 else 239 device_printf(adapter->pdev, 240 "Unable to get indirection table\n"); 241 return (rc); 242 } 243 244 for (i = 0; i < ENA_RX_RSS_TABLE_SIZE; ++i) 245 table[i] = ENA_IO_RXQ_IDX_TO_COMBINED_IDX(table[i]); 246 247 return (0); 248 } 249 250 int 251 ena_rss_indir_set(struct ena_adapter *adapter, uint32_t *table) 252 { 253 int rc, i; 254 255 for (i = 0; i < ENA_RX_RSS_TABLE_SIZE; ++i) { 256 rc = ena_com_indirect_table_fill_entry(adapter->ena_dev, i, 257 ENA_IO_RXQ_IDX(table[i])); 258 if (rc != 0) { 259 device_printf(adapter->pdev, 260 "Cannot fill indirection table entry %d\n", i); 261 return (rc); 262 } 263 } 264 265 rc = ena_com_indirect_table_set(adapter->ena_dev); 266 if (rc == EOPNOTSUPP) 267 device_printf(adapter->pdev, 268 "Writing to indirection table not supported\n"); 269 else if (rc != 0) 270 device_printf(adapter->pdev, 271 "Cannot set indirection table\n"); 272 273 return (rc); 274 } 275 276 int 277 ena_rss_indir_init(struct ena_adapter *adapter) 278 { 279 struct ena_indir *indir = adapter->rss_indir; 280 int rc; 281 282 if (indir == NULL) { 283 adapter->rss_indir = indir = malloc(sizeof(struct ena_indir), 284 M_DEVBUF, M_WAITOK | M_ZERO); 285 if (indir == NULL) 286 return (ENOMEM); 287 } 288 289 rc = ena_rss_indir_get(adapter, indir->table); 290 if (rc != 0) { 291 free(adapter->rss_indir, M_DEVBUF); 292 adapter->rss_indir = NULL; 293 294 return (rc); 295 } 296 297 ena_rss_copy_indir_buf(indir->sysctl_buf, indir->table); 298 299 return (0); 300 } 301