ena_rss.c

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    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 }
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FreeBSD/Linux Kernel Cross Reference sys/dev/ena/ena_rss.c

FreeBSD/Linux Kernel Cross Reference
sys/dev/ena/ena_rss.c
