diff options
Diffstat (limited to 'drivers/net')
| -rw-r--r-- | drivers/net/wireless/rt2x00/rt2x00.h | 10 | ||||
| -rw-r--r-- | drivers/net/wireless/rt2x00/rt2x00crypto.c | 68 | ||||
| -rw-r--r-- | drivers/net/wireless/rt2x00/rt2x00dev.c | 33 | ||||
| -rw-r--r-- | drivers/net/wireless/rt2x00/rt2x00lib.h | 27 | ||||
| -rw-r--r-- | drivers/net/wireless/rt2x00/rt2x00queue.c | 39 | ||||
| -rw-r--r-- | drivers/net/wireless/rt2x00/rt2x00queue.h | 14 |
6 files changed, 143 insertions, 48 deletions
diff --git a/drivers/net/wireless/rt2x00/rt2x00.h b/drivers/net/wireless/rt2x00/rt2x00.h index 0be39552826..7c5cbb192a6 100644 --- a/drivers/net/wireless/rt2x00/rt2x00.h +++ b/drivers/net/wireless/rt2x00/rt2x00.h @@ -103,6 +103,15 @@ #define GET_DURATION_RES(__size, __rate)(((__size) * 8 * 10) % (__rate)) /* + * Determine the alignment requirement, + * to make sure the 802.11 payload is padded to a 4-byte boundrary + * we must determine the address of the payload and calculate the + * amount of bytes needed to move the data. + */ +#define ALIGN_SIZE(__skb, __header) \ + ( ((unsigned long)((__skb)->data + (__header))) & 3 ) + +/* * Standard timing and size defines. * These values should follow the ieee80211 specifications. */ @@ -590,6 +599,7 @@ enum rt2x00_flags { DRIVER_REQUIRE_SCHEDULED, DRIVER_REQUIRE_DMA, DRIVER_REQUIRE_COPY_IV, + DRIVER_REQUIRE_L2PAD, /* * Driver features diff --git a/drivers/net/wireless/rt2x00/rt2x00crypto.c b/drivers/net/wireless/rt2x00/rt2x00crypto.c index ae31581372c..57ab42cfed3 100644 --- a/drivers/net/wireless/rt2x00/rt2x00crypto.c +++ b/drivers/net/wireless/rt2x00/rt2x00crypto.c @@ -65,7 +65,7 @@ void rt2x00crypto_create_tx_descriptor(struct queue_entry *entry, __set_bit(ENTRY_TXD_ENCRYPT_PAIRWISE, &txdesc->flags); txdesc->key_idx = hw_key->hw_key_idx; - txdesc->iv_offset = ieee80211_get_hdrlen_from_skb(entry->skb); + txdesc->iv_offset = txdesc->header_length; txdesc->iv_len = hw_key->iv_len; if (!(hw_key->flags & IEEE80211_KEY_FLAG_GENERATE_IV)) @@ -132,17 +132,16 @@ void rt2x00crypto_tx_remove_iv(struct sk_buff *skb, struct txentry_desc *txdesc) skb_pull(skb, txdesc->iv_len); /* IV/EIV data has officially be stripped */ - skbdesc->flags |= FRAME_DESC_IV_STRIPPED; + skbdesc->flags |= SKBDESC_IV_STRIPPED; } -void rt2x00crypto_tx_insert_iv(struct sk_buff *skb) +void rt2x00crypto_tx_insert_iv(struct sk_buff *skb, unsigned int header_length) { struct skb_frame_desc *skbdesc = get_skb_frame_desc(skb); - unsigned int header_length = ieee80211_get_hdrlen_from_skb(skb); const unsigned int iv_len = ((!!(skbdesc->iv[0])) * 4) + ((!!(skbdesc->iv[1])) * 4); - if (!(skbdesc->flags & FRAME_DESC_IV_STRIPPED)) + if (!(skbdesc->flags & SKBDESC_IV_STRIPPED)) return; skb_push(skb, iv_len); @@ -154,14 +153,15 @@ void rt2x00crypto_tx_insert_iv(struct sk_buff *skb) memcpy(skb->data + header_length, skbdesc->iv, iv_len); /* IV/EIV data has returned into the frame */ - skbdesc->flags &= ~FRAME_DESC_IV_STRIPPED; + skbdesc->flags &= ~SKBDESC_IV_STRIPPED; } -void rt2x00crypto_rx_insert_iv(struct sk_buff *skb, unsigned int align, +void rt2x00crypto_rx_insert_iv(struct sk_buff *skb, bool l2pad, unsigned int header_length, struct rxdone_entry_desc *rxdesc) { unsigned int payload_len = rxdesc->size - header_length; + unsigned int align = ALIGN_SIZE(skb, header_length); unsigned int iv_len; unsigned int icv_len; unsigned int transfer = 0; @@ -191,32 +191,48 @@ void rt2x00crypto_rx_insert_iv(struct sk_buff *skb, unsigned int align, } /* - * Make room for new data, note that we increase both - * headsize and tailsize when required. The tailsize is - * only needed when ICV data needs to be inserted and - * the padding is smaller than the ICV data. - * When alignment requirements is greater than the - * ICV data we must trim the skb to the correct size - * because we need to remove the extra bytes. + * Make room for new data. There are 2 possibilities + * either the alignment is already present between + * the 802.11 header and payload. In that case we + * we have to move the header less then the iv_len + * since we can use the already available l2pad bytes + * for the iv data. + * When the alignment must be added manually we must + * move the header more then iv_len since we must + * make room for the payload move as well. */ - skb_push(skb, iv_len + align); - if (align < icv_len) - skb_put(skb, icv_len - align); - else if (align > icv_len) - skb_trim(skb, rxdesc->size + iv_len + icv_len); + if (l2pad) { + skb_push(skb, iv_len - align); + skb_put(skb, icv_len); - /* Move ieee80211 header */ - memmove(skb->data + transfer, - skb->data + transfer + iv_len + align, - header_length); - transfer += header_length; + /* Move ieee80211 header */ + memmove(skb->data + transfer, + skb->data + transfer + (iv_len - align), + header_length); + transfer += header_length; + } else { + skb_push(skb, iv_len + align); + if (align < icv_len) + skb_put(skb, icv_len - align); + else if (align > icv_len) + skb_trim(skb, rxdesc->size + iv_len + icv_len); + + /* Move ieee80211 header */ + memmove(skb->data + transfer, + skb->data + transfer + iv_len + align, + header_length); + transfer += header_length; + } /* Copy IV/EIV data */ memcpy(skb->data + transfer, rxdesc->iv, iv_len); transfer += iv_len; - /* Move payload */ - if (align) { + /* + * Move payload for alignment purposes. Note that + * this is only needed when no l2 padding is present. + */ + if (!l2pad) { memmove(skb->data + transfer, skb->data + transfer + align, payload_len); diff --git a/drivers/net/wireless/rt2x00/rt2x00dev.c b/drivers/net/wireless/rt2x00/rt2x00dev.c index 5752aaae906..e15086af727 100644 --- a/drivers/net/wireless/rt2x00/rt2x00dev.c +++ b/drivers/net/wireless/rt2x00/rt2x00dev.c @@ -227,6 +227,7 @@ void rt2x00lib_txdone(struct queue_entry *entry, struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(entry->skb); struct skb_frame_desc *skbdesc = get_skb_frame_desc(entry->skb); enum data_queue_qid qid = skb_get_queue_mapping(entry->skb); + unsigned int header_length = ieee80211_get_hdrlen_from_skb(entry->skb); u8 rate_idx, rate_flags; /* @@ -235,13 +236,19 @@ void rt2x00lib_txdone(struct queue_entry *entry, rt2x00queue_unmap_skb(rt2x00dev, entry->skb); /* + * Remove L2 padding which was added during + */ + if (test_bit(DRIVER_REQUIRE_L2PAD, &rt2x00dev->flags)) + rt2x00queue_payload_align(entry->skb, true, header_length); + + /* * If the IV/EIV data was stripped from the frame before it was * passed to the hardware, we should now reinsert it again because * mac80211 will expect the the same data to be present it the * frame as it was passed to us. */ if (test_bit(CONFIG_SUPPORT_HW_CRYPTO, &rt2x00dev->flags)) - rt2x00crypto_tx_insert_iv(entry->skb); + rt2x00crypto_tx_insert_iv(entry->skb, header_length); /* * Send frame to debugfs immediately, after this call is completed @@ -325,7 +332,7 @@ void rt2x00lib_rxdone(struct rt2x00_dev *rt2x00dev, struct ieee80211_supported_band *sband; const struct rt2x00_rate *rate; unsigned int header_length; - unsigned int align; + bool l2pad; unsigned int i; int idx = -1; @@ -348,12 +355,15 @@ void rt2x00lib_rxdone(struct rt2x00_dev *rt2x00dev, memset(&rxdesc, 0, sizeof(rxdesc)); rt2x00dev->ops->lib->fill_rxdone(entry, &rxdesc); + /* Trim buffer to correct size */ + skb_trim(entry->skb, rxdesc.size); + /* * The data behind the ieee80211 header must be * aligned on a 4 byte boundary. */ header_length = ieee80211_get_hdrlen_from_skb(entry->skb); - align = ((unsigned long)(entry->skb->data + header_length)) & 3; + l2pad = !!(rxdesc.dev_flags & RXDONE_L2PAD); /* * Hardware might have stripped the IV/EIV/ICV data, @@ -362,18 +372,11 @@ void rt2x00lib_rxdone(struct rt2x00_dev *rt2x00dev, * in which case we should reinsert the data into the frame. */ if ((rxdesc.dev_flags & RXDONE_CRYPTO_IV) && - (rxdesc.flags & RX_FLAG_IV_STRIPPED)) { - rt2x00crypto_rx_insert_iv(entry->skb, align, - header_length, &rxdesc); - } else if (align) { - skb_push(entry->skb, align); - /* Move entire frame in 1 command */ - memmove(entry->skb->data, entry->skb->data + align, - rxdesc.size); - } - - /* Update data pointers, trim buffer to correct size */ - skb_trim(entry->skb, rxdesc.size); + (rxdesc.flags & RX_FLAG_IV_STRIPPED)) + rt2x00crypto_rx_insert_iv(entry->skb, l2pad, header_length, + &rxdesc); + else + rt2x00queue_payload_align(entry->skb, l2pad, header_length); /* * Update RX statistics. diff --git a/drivers/net/wireless/rt2x00/rt2x00lib.h b/drivers/net/wireless/rt2x00/rt2x00lib.h index af3c47bd43b..aa284e48d2c 100644 --- a/drivers/net/wireless/rt2x00/rt2x00lib.h +++ b/drivers/net/wireless/rt2x00/rt2x00lib.h @@ -113,6 +113,23 @@ void rt2x00queue_unmap_skb(struct rt2x00_dev *rt2x00dev, struct sk_buff *skb); void rt2x00queue_free_skb(struct rt2x00_dev *rt2x00dev, struct sk_buff *skb); /** + * rt2x00queue_payload_align - Align 802.11 payload to 4-byte boundary + * @skb: The skb to align + * @l2pad: Should L2 padding be used + * @header_length: Length of 802.11 header + * + * This function prepares the @skb to be send to the device or mac80211. + * If @l2pad is set to true padding will occur between the 802.11 header + * and payload. Otherwise the padding will be done in front of the 802.11 + * header. + * When @l2pad is set the function will check for the &SKBDESC_L2_PADDED + * flag in &skb_frame_desc. If that flag is set, the padding is removed + * and the flag cleared. Otherwise the padding is added and the flag is set. + */ +void rt2x00queue_payload_align(struct sk_buff *skb, + bool l2pad, unsigned int header_length); + +/** * rt2x00queue_write_tx_frame - Write TX frame to hardware * @queue: Queue over which the frame should be send * @skb: The skb to send @@ -299,8 +316,8 @@ void rt2x00crypto_tx_copy_iv(struct sk_buff *skb, struct txentry_desc *txdesc); void rt2x00crypto_tx_remove_iv(struct sk_buff *skb, struct txentry_desc *txdesc); -void rt2x00crypto_tx_insert_iv(struct sk_buff *skb); -void rt2x00crypto_rx_insert_iv(struct sk_buff *skb, unsigned int align, +void rt2x00crypto_tx_insert_iv(struct sk_buff *skb, unsigned int header_length); +void rt2x00crypto_rx_insert_iv(struct sk_buff *skb, bool l2pad, unsigned int header_length, struct rxdone_entry_desc *rxdesc); #else @@ -330,12 +347,12 @@ static inline void rt2x00crypto_tx_remove_iv(struct sk_buff *skb, { } -static inline void rt2x00crypto_tx_insert_iv(struct sk_buff *skb) +static inline void rt2x00crypto_tx_insert_iv(struct sk_buff *skb, + unsigned int header_length) { } -static inline void rt2x00crypto_rx_insert_iv(struct sk_buff *skb, - unsigned int align, +static inline void rt2x00crypto_rx_insert_iv(struct sk_buff *skb, bool l2pad, unsigned int header_length, struct rxdone_entry_desc *rxdesc) { diff --git a/drivers/net/wireless/rt2x00/rt2x00queue.c b/drivers/net/wireless/rt2x00/rt2x00queue.c index 6f78915b364..bc1742c1d51 100644 --- a/drivers/net/wireless/rt2x00/rt2x00queue.c +++ b/drivers/net/wireless/rt2x00/rt2x00queue.c @@ -148,6 +148,35 @@ void rt2x00queue_free_skb(struct rt2x00_dev *rt2x00dev, struct sk_buff *skb) dev_kfree_skb_any(skb); } +void rt2x00queue_payload_align(struct sk_buff *skb, + bool l2pad, unsigned int header_length) +{ + struct skb_frame_desc *skbdesc = get_skb_frame_desc(skb); + unsigned int frame_length = skb->len; + unsigned int align = ALIGN_SIZE(skb, header_length); + + if (!align) + return; + + if (l2pad) { + if (skbdesc->flags & SKBDESC_L2_PADDED) { + /* Remove L2 padding */ + memmove(skb->data + align, skb->data, header_length); + skb_pull(skb, align); + skbdesc->flags &= ~SKBDESC_L2_PADDED; + } else { + /* Add L2 padding */ + skb_push(skb, align); + memmove(skb->data, skb->data + align, header_length); + skbdesc->flags |= SKBDESC_L2_PADDED; + } + } else { + /* Generic payload alignment to 4-byte boundary */ + skb_push(skb, align); + memmove(skb->data, skb->data + align, frame_length); + } +} + static void rt2x00queue_create_tx_descriptor_seq(struct queue_entry *entry, struct txentry_desc *txdesc) { @@ -259,6 +288,12 @@ static void rt2x00queue_create_tx_descriptor(struct queue_entry *entry, txdesc->aifs = entry->queue->aifs; /* + * Header and alignment information. + */ + txdesc->header_length = ieee80211_get_hdrlen_from_skb(entry->skb); + txdesc->l2pad = ALIGN_SIZE(entry->skb, txdesc->header_length); + + /* * Check whether this frame is to be acked. */ if (!(tx_info->flags & IEEE80211_TX_CTL_NO_ACK)) @@ -416,6 +451,10 @@ int rt2x00queue_write_tx_frame(struct data_queue *queue, struct sk_buff *skb) rt2x00crypto_tx_remove_iv(skb, &txdesc); } + if (test_bit(DRIVER_REQUIRE_L2PAD, &queue->rt2x00dev->flags)) + rt2x00queue_payload_align(entry->skb, true, + txdesc.header_length); + /* * It could be possible that the queue was corrupted and this * call failed. Since we always return NETDEV_TX_OK to mac80211, diff --git a/drivers/net/wireless/rt2x00/rt2x00queue.h b/drivers/net/wireless/rt2x00/rt2x00queue.h index e3bfd73e319..13e0ece176a 100644 --- a/drivers/net/wireless/rt2x00/rt2x00queue.h +++ b/drivers/net/wireless/rt2x00/rt2x00queue.h @@ -87,13 +87,16 @@ enum data_queue_qid { * * @SKBDESC_DMA_MAPPED_RX: &skb_dma field has been mapped for RX * @SKBDESC_DMA_MAPPED_TX: &skb_dma field has been mapped for TX - * @FRAME_DESC_IV_STRIPPED: Frame contained a IV/EIV provided by + * @SKBDESC_IV_STRIPPED: Frame contained a IV/EIV provided by * mac80211 but was stripped for processing by the driver. + * @SKBDESC_L2_PADDED: Payload has been padded for 4-byte alignment, + * the padded bytes are located between header and payload. */ enum skb_frame_desc_flags { SKBDESC_DMA_MAPPED_RX = 1 << 0, SKBDESC_DMA_MAPPED_TX = 1 << 1, - FRAME_DESC_IV_STRIPPED = 1 << 2, + SKBDESC_IV_STRIPPED = 1 << 2, + SKBDESC_L2_PADDED = 1 << 3 }; /** @@ -148,6 +151,7 @@ static inline struct skb_frame_desc* get_skb_frame_desc(struct sk_buff *skb) * @RXDONE_MY_BSS: Does this frame originate from device's BSS. * @RXDONE_CRYPTO_IV: Driver provided IV/EIV data. * @RXDONE_CRYPTO_ICV: Driver provided ICV data. + * @RXDONE_L2PAD: 802.11 payload has been padded to 4-byte boundary. */ enum rxdone_entry_desc_flags { RXDONE_SIGNAL_PLCP = 1 << 0, @@ -155,6 +159,7 @@ enum rxdone_entry_desc_flags { RXDONE_MY_BSS = 1 << 2, RXDONE_CRYPTO_IV = 1 << 3, RXDONE_CRYPTO_ICV = 1 << 4, + RXDONE_L2PAD = 1 << 5, }; /** @@ -267,6 +272,8 @@ enum txentry_desc_flags { * * @flags: Descriptor flags (See &enum queue_entry_flags). * @queue: Queue identification (See &enum data_queue_qid). + * @header_length: Length of 802.11 header. + * @l2pad: Amount of padding to align 802.11 payload to 4-byte boundrary. * @length_high: PLCP length high word. * @length_low: PLCP length low word. * @signal: PLCP signal. @@ -287,6 +294,9 @@ struct txentry_desc { enum data_queue_qid queue; + u16 header_length; + u16 l2pad; + u16 length_high; u16 length_low; u16 signal; |