package/mac80211/patches/300-rt2x00_hw_encryption.patch

   1 From: Ivo van Doorn <IvDoorn@gmail.com>
   2 Date: Thu, 20 Nov 2008 22:29:36 +0000 (+0100)
   3 Subject: rt2x00: Implement HW encryption (rt2500usb)
   4 X-Git-Url: http://git.kernel.org/?p=linux%2Fkernel%2Fgit%2Fivd%2Frt2x00.git;a=commitdiff_plain;h=52fe465ab5eb6aeead5ac8d91dd70e363d0560b7
   5
   6 rt2x00: Implement HW encryption (rt2500usb)
   7
   8 rt2500usb supports hardware encryption.
   9 rt2500usb supports up to 4 shared and pairwise keys.
  10
  11 Signed-off-by: Ivo van Doorn <IvDoorn@gmail.com>
  12 ---
  13
  14 diff --git a/drivers/net/wireless/rt2x00/rt2500usb.c b/drivers/net/wireless/rt2x00/rt2500usb.c
  15 index 10cb46a..620ac65 100644
  16 --- a/drivers/net/wireless/rt2x00/rt2500usb.c
  17 +++ b/drivers/net/wireless/rt2x00/rt2500usb.c
  18 @@ -36,6 +36,13 @@
  19  #include "rt2500usb.h"
  20
  21  /*
  22 + * Allow hardware encryption to be disabled.
  23 + */
  24 +static int modparam_nohwcrypt = 0;
  25 +module_param_named(nohwcrypt, modparam_nohwcrypt, bool, S_IRUGO);
  26 +MODULE_PARM_DESC(nohwcrypt, "Disable hardware encryption.");
  27 +
  28 +/*
  29   * Register access.
  30   * All access to the CSR registers will go through the methods
  31   * rt2500usb_register_read and rt2500usb_register_write.
  32 @@ -323,6 +330,85 @@ static void rt2500usb_init_led(struct rt2x00_dev *rt2x00dev,
  33  /*
  34   * Configuration handlers.
  35   */
  36 +
  37 +/*
  38 + * rt2500usb does not differentiate between shared and pairwise
  39 + * keys, so we should use the same function for both key types.
  40 + */
  41 +static int rt2500usb_config_key(struct rt2x00_dev *rt2x00dev,
  42 +                               struct rt2x00lib_crypto *crypto,
  43 +                               struct ieee80211_key_conf *key)
  44 +{
  45 +       int timeout;
  46 +       u32 mask;
  47 +       u16 reg;
  48 +
  49 +       /* Support up to 4 keys */
  50 +       if (key->hw_key_idx >= 4)
  51 +               return -ENOSPC;
  52 +
  53 +       if (crypto->cmd == SET_KEY) {
  54 +               /*
  55 +                * Pairwise key will always be entry 0, but this
  56 +                * could collide with a shared key on the same
  57 +                * position...
  58 +                */
  59 +               mask = TXRX_CSR0_KEY_ID.bit_mask;
  60 +
  61 +               rt2500usb_register_read(rt2x00dev, TXRX_CSR0, &reg);
  62 +
  63 +               if ((reg & mask) && (reg & mask) == mask)
  64 +                       return -ENOSPC;
  65 +
  66 +               reg = rt2x00_get_field16(reg, TXRX_CSR0_KEY_ID);
  67 +
  68 +               key->hw_key_idx += reg ? ffz(reg) : 0;
  69 +
  70 +               /*
  71 +                * The encryption key doesn't fit within the CSR cache,
  72 +                * this means we should allocate it seperately and use
  73 +                * rt2x00usb_vendor_request() to send the key to the hardware.
  74 +                */
  75 +               reg = KEY_ENTRY(key->hw_key_idx);
  76 +               timeout = REGISTER_TIMEOUT32(sizeof(crypto->key));
  77 +               rt2x00usb_vendor_request_large_buff(rt2x00dev, USB_MULTI_WRITE,
  78 +                                                   USB_VENDOR_REQUEST_OUT, reg,
  79 +                                                   crypto->key,
  80 +                                                   sizeof(crypto->key),
  81 +                                                   timeout);
  82 +
  83 +               /*
  84 +                * The driver does not support the IV/EIV generation
  85 +                * in hardware. However it doesn't support the IV/EIV
  86 +                * inside the ieee80211 frame either, but requires it
  87 +                * to be provided seperately for the descriptor.
  88 +                * rt2x00lib will cut the IV/EIV data out of all frames
  89 +                * given to us by mac80211, but we must tell mac80211
  90 +                * to generate the IV/EIV data.
  91 +                */
  92 +               key->flags |= IEEE80211_KEY_FLAG_GENERATE_IV;
  93 +               key->flags |= IEEE80211_KEY_FLAG_GENERATE_MMIC;
  94 +       }
  95 +
  96 +       /*
  97 +        * TXRX_CSR0_KEY_ID contains only single-bit fields to indicate
  98 +        * a particular key is valid.
  99 +        */
 100 +       rt2500usb_register_read(rt2x00dev, TXRX_CSR0, &reg);
 101 +       rt2x00_set_field16(&reg, TXRX_CSR0_ALGORITHM, crypto->cipher);
 102 +       rt2x00_set_field16(&reg, TXRX_CSR0_IV_OFFSET, IEEE80211_HEADER);
 103 +
 104 +       mask = rt2x00_get_field16(reg, TXRX_CSR0_KEY_ID);
 105 +       if (crypto->cmd == SET_KEY)
 106 +               mask |= 1 << key->hw_key_idx;
 107 +       else if (crypto->cmd == DISABLE_KEY)
 108 +               mask &= ~(1 << key->hw_key_idx);
 109 +       rt2x00_set_field16(&reg, TXRX_CSR0_KEY_ID, mask);
 110 +       rt2500usb_register_write(rt2x00dev, TXRX_CSR0, reg);
 111 +
 112 +       return 0;
 113 +}
 114 +
 115  static void rt2500usb_config_filter(struct rt2x00_dev *rt2x00dev,
 116                                     const unsigned int filter_flags)
 117  {
 118 @@ -844,7 +930,7 @@ static int rt2500usb_init_registers(struct rt2x00_dev *rt2x00dev)
 119
 120         rt2500usb_register_read(rt2x00dev, TXRX_CSR0, &reg);
 121         rt2x00_set_field16(&reg, TXRX_CSR0_IV_OFFSET, IEEE80211_HEADER);
 122 -       rt2x00_set_field16(&reg, TXRX_CSR0_KEY_ID, 0xff);
 123 +       rt2x00_set_field16(&reg, TXRX_CSR0_KEY_ID, 0);
 124         rt2500usb_register_write(rt2x00dev, TXRX_CSR0, reg);
 125
 126         rt2500usb_register_read(rt2x00dev, MAC_CSR18, &reg);
 127 @@ -1066,7 +1152,7 @@ static void rt2500usb_write_tx_desc(struct rt2x00_dev *rt2x00dev,
 128          * Start writing the descriptor words.
 129          */
 130         rt2x00_desc_read(txd, 1, &word);
 131 -       rt2x00_set_field32(&word, TXD_W1_IV_OFFSET, IEEE80211_HEADER);
 132 +       rt2x00_set_field32(&word, TXD_W1_IV_OFFSET, txdesc->iv_offset);
 133         rt2x00_set_field32(&word, TXD_W1_AIFS, txdesc->aifs);
 134         rt2x00_set_field32(&word, TXD_W1_CWMIN, txdesc->cw_min);
 135         rt2x00_set_field32(&word, TXD_W1_CWMAX, txdesc->cw_max);
 136 @@ -1079,6 +1165,11 @@ static void rt2500usb_write_tx_desc(struct rt2x00_dev *rt2x00dev,
 137         rt2x00_set_field32(&word, TXD_W2_PLCP_LENGTH_HIGH, txdesc->length_high);
 138         rt2x00_desc_write(txd, 2, word);
 139
 140 +       if (test_bit(ENTRY_TXD_ENCRYPT, &txdesc->flags)) {
 141 +               _rt2x00_desc_write(txd, 3, skbdesc->iv);
 142 +               _rt2x00_desc_write(txd, 4, skbdesc->eiv);
 143 +       }
 144 +
 145         rt2x00_desc_read(txd, 0, &word);
 146         rt2x00_set_field32(&word, TXD_W0_RETRY_LIMIT, txdesc->retry_limit);
 147         rt2x00_set_field32(&word, TXD_W0_MORE_FRAG,
 148 @@ -1093,7 +1184,8 @@ static void rt2500usb_write_tx_desc(struct rt2x00_dev *rt2x00dev,
 149                            test_bit(ENTRY_TXD_FIRST_FRAGMENT, &txdesc->flags));
 150         rt2x00_set_field32(&word, TXD_W0_IFS, txdesc->ifs);
 151         rt2x00_set_field32(&word, TXD_W0_DATABYTE_COUNT, skb->len);
 152 -       rt2x00_set_field32(&word, TXD_W0_CIPHER, CIPHER_NONE);
 153 +       rt2x00_set_field32(&word, TXD_W0_CIPHER, txdesc->cipher);
 154 +       rt2x00_set_field32(&word, TXD_W0_KEY_ID, txdesc->key_idx);
 155         rt2x00_desc_write(txd, 0, word);
 156  }
 157
 158 @@ -1204,6 +1296,7 @@ static void rt2500usb_kick_tx_queue(struct rt2x00_dev *rt2x00dev,
 159  static void rt2500usb_fill_rxdone(struct queue_entry *entry,
 160                                   struct rxdone_entry_desc *rxdesc)
 161  {
 162 +       struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
 163         struct queue_entry_priv_usb *entry_priv = entry->priv_data;
 164         struct skb_frame_desc *skbdesc = get_skb_frame_desc(entry->skb);
 165         __le32 *rxd =
 166 @@ -1231,6 +1324,31 @@ static void rt2500usb_fill_rxdone(struct queue_entry *entry,
 167         if (rt2x00_get_field32(word0, RXD_W0_PHYSICAL_ERROR))
 168                 rxdesc->flags |= RX_FLAG_FAILED_PLCP_CRC;
 169
 170 +       if (test_bit(CONFIG_SUPPORT_HW_CRYPTO, &rt2x00dev->flags)) {
 171 +               rxdesc->cipher = rt2x00_get_field32(word0, RXD_W0_CIPHER);
 172 +               if (rt2x00_get_field32(word0, RXD_W0_CIPHER_ERROR))
 173 +                       rxdesc->cipher_status = RX_CRYPTO_FAIL_KEY;
 174 +       }
 175 +
 176 +       if (rxdesc->cipher != CIPHER_NONE) {
 177 +               _rt2x00_desc_read(rxd, 2, &rxdesc->iv);
 178 +               _rt2x00_desc_read(rxd, 3, &rxdesc->eiv);
 179 +               /* ICV is located at the end of frame */
 180 +
 181 +               /*
 182 +                * Hardware has stripped IV/EIV data from 802.11 frame during
 183 +                * decryption. It has provided the data seperately but rt2x00lib
 184 +                * should decide if it should be reinserted.
 185 +                */
 186 +               rxdesc->flags |= RX_FLAG_IV_STRIPPED;
 187 +               if (rxdesc->cipher != CIPHER_TKIP)
 188 +                       rxdesc->flags |= RX_FLAG_MMIC_STRIPPED;
 189 +               if (rxdesc->cipher_status == RX_CRYPTO_SUCCESS)
 190 +                       rxdesc->flags |= RX_FLAG_DECRYPTED;
 191 +               else if (rxdesc->cipher_status == RX_CRYPTO_FAIL_MIC)
 192 +                       rxdesc->flags |= RX_FLAG_MMIC_ERROR;
 193 +       }
 194 +
 195         /*
 196          * Obtain the status about this packet.
 197          * When frame was received with an OFDM bitrate,
 198 @@ -1238,8 +1356,8 @@ static void rt2500usb_fill_rxdone(struct queue_entry *entry,
 199          * a CCK bitrate the signal is the rate in 100kbit/s.
 200          */
 201         rxdesc->signal = rt2x00_get_field32(word1, RXD_W1_SIGNAL);
 202 -       rxdesc->rssi = rt2x00_get_field32(word1, RXD_W1_RSSI) -
 203 -           entry->queue->rt2x00dev->rssi_offset;
 204 +       rxdesc->rssi =
 205 +           rt2x00_get_field32(word1, RXD_W1_RSSI) - rt2x00dev->rssi_offset;
 206         rxdesc->size = rt2x00_get_field32(word0, RXD_W0_DATABYTE_COUNT);
 207
 208         if (rt2x00_get_field32(word0, RXD_W0_OFDM))
 209 @@ -1729,6 +1847,8 @@ static int rt2500usb_probe_hw(struct rt2x00_dev *rt2x00dev)
 210         __set_bit(DRIVER_REQUIRE_ATIM_QUEUE, &rt2x00dev->flags);
 211         __set_bit(DRIVER_REQUIRE_BEACON_GUARD, &rt2x00dev->flags);
 212         __set_bit(DRIVER_REQUIRE_SCHEDULED, &rt2x00dev->flags);
 213 +       if (!modparam_nohwcrypt)
 214 +               __set_bit(CONFIG_SUPPORT_HW_CRYPTO, &rt2x00dev->flags);
 215         __set_bit(CONFIG_DISABLE_LINK_TUNING, &rt2x00dev->flags);
 216
 217         /*
 218 @@ -1748,6 +1868,7 @@ static const struct ieee80211_ops rt2500usb_mac80211_ops = {
 219         .config                 = rt2x00mac_config,
 220         .config_interface       = rt2x00mac_config_interface,
 221         .configure_filter       = rt2x00mac_configure_filter,
 222 +       .set_key                = rt2x00mac_set_key,
 223         .get_stats              = rt2x00mac_get_stats,
 224         .bss_info_changed       = rt2x00mac_bss_info_changed,
 225         .conf_tx                = rt2x00mac_conf_tx,
 226 @@ -1769,6 +1890,8 @@ static const struct rt2x00lib_ops rt2500usb_rt2x00_ops = {
 227         .get_tx_data_len        = rt2500usb_get_tx_data_len,
 228         .kick_tx_queue          = rt2500usb_kick_tx_queue,
 229         .fill_rxdone            = rt2500usb_fill_rxdone,
 230 +       .config_shared_key      = rt2500usb_config_key,
 231 +       .config_pairwise_key    = rt2500usb_config_key,
 232         .config_filter          = rt2500usb_config_filter,
 233         .config_intf            = rt2500usb_config_intf,
 234         .config_erp             = rt2500usb_config_erp,
 235 diff --git a/drivers/net/wireless/rt2x00/rt2500usb.h b/drivers/net/wireless/rt2x00/rt2500usb.h
 236 index dbb5d68..4347dfd 100644
 237 --- a/drivers/net/wireless/rt2x00/rt2500usb.h
 238 +++ b/drivers/net/wireless/rt2x00/rt2500usb.h
 239 @@ -447,6 +447,9 @@
 240  #define SEC_CSR30                      0x04bc
 241  #define SEC_CSR31                      0x04be
 242
 243 +#define KEY_ENTRY(__idx) \
 244 +       ( SEC_CSR0 + ((__idx) * 16) )
 245 +
 246  /*
 247   * PHY control registers.
 248   */