From 8a98d49ec1f38d9f3eef7e34f148c3f1f5590fdf Mon Sep 17 00:00:00 2001 From: Johannes Berg Date: Fri, 29 Apr 2011 09:48:14 -0700 Subject: [PATCH] iwlagn: remove frame pre-allocation The frame pre-allocation is quite a bit of complex code, all to avoid a single allocation. Remove it and consolidate the beacon sending code. Signed-off-by: Johannes Berg Signed-off-by: Wey-Yi Guy --- drivers/net/wireless/iwlwifi/iwl-agn.c | 137 ++++++--------------------------- drivers/net/wireless/iwlwifi/iwl-dev.h | 13 ---- 2 files changed, 25 insertions(+), 125 deletions(-) diff --git a/drivers/net/wireless/iwlwifi/iwl-agn.c b/drivers/net/wireless/iwlwifi/iwl-agn.c index 09fe841..3ecc319 100644 --- a/drivers/net/wireless/iwlwifi/iwl-agn.c +++ b/drivers/net/wireless/iwlwifi/iwl-agn.c @@ -102,70 +102,6 @@ void iwl_update_chain_flags(struct iwl_priv *priv) } } -static void iwl_clear_free_frames(struct iwl_priv *priv) -{ - struct list_head *element; - - IWL_DEBUG_INFO(priv, "%d frames on pre-allocated heap on clear.\n", - priv->frames_count); - - while (!list_empty(&priv->free_frames)) { - element = priv->free_frames.next; - list_del(element); - kfree(list_entry(element, struct iwl_frame, list)); - priv->frames_count--; - } - - if (priv->frames_count) { - IWL_WARN(priv, "%d frames still in use. Did we lose one?\n", - priv->frames_count); - priv->frames_count = 0; - } -} - -static struct iwl_frame *iwl_get_free_frame(struct iwl_priv *priv) -{ - struct iwl_frame *frame; - struct list_head *element; - if (list_empty(&priv->free_frames)) { - frame = kzalloc(sizeof(*frame), GFP_KERNEL); - if (!frame) { - IWL_ERR(priv, "Could not allocate frame!\n"); - return NULL; - } - - priv->frames_count++; - return frame; - } - - element = priv->free_frames.next; - list_del(element); - return list_entry(element, struct iwl_frame, list); -} - -static void iwl_free_frame(struct iwl_priv *priv, struct iwl_frame *frame) -{ - memset(frame, 0, sizeof(*frame)); - list_add(&frame->list, &priv->free_frames); -} - -static u32 iwl_fill_beacon_frame(struct iwl_priv *priv, - struct ieee80211_hdr *hdr, - int left) -{ - lockdep_assert_held(&priv->mutex); - - if (!priv->beacon_skb) - return 0; - - if (priv->beacon_skb->len > left) - return 0; - - memcpy(hdr, priv->beacon_skb->data, priv->beacon_skb->len); - - return priv->beacon_skb->len; -} - /* Parse the beacon frame to find the TIM element and set tim_idx & tim_size */ static void iwl_set_beacon_tim(struct iwl_priv *priv, struct iwl_tx_beacon_cmd *tx_beacon_cmd, @@ -193,13 +129,18 @@ static void iwl_set_beacon_tim(struct iwl_priv *priv, IWL_WARN(priv, "Unable to find TIM Element in beacon\n"); } -static unsigned int iwl_hw_get_beacon_cmd(struct iwl_priv *priv, - struct iwl_frame *frame) +int iwlagn_send_beacon_cmd(struct iwl_priv *priv) { struct iwl_tx_beacon_cmd *tx_beacon_cmd; + struct iwl_host_cmd cmd = { + .id = REPLY_TX_BEACON, + .flags = CMD_SIZE_HUGE, + }; u32 frame_size; u32 rate_flags; u32 rate; + int err; + /* * We have to set up the TX command, the TX Beacon command, and the * beacon contents. @@ -212,17 +153,19 @@ static unsigned int iwl_hw_get_beacon_cmd(struct iwl_priv *priv, return 0; } - /* Initialize memory */ - tx_beacon_cmd = &frame->u.beacon; - memset(tx_beacon_cmd, 0, sizeof(*tx_beacon_cmd)); + if (WARN_ON(!priv->beacon_skb)) + return -EINVAL; + + /* Allocate beacon memory */ + tx_beacon_cmd = kzalloc(sizeof(*tx_beacon_cmd) + priv->beacon_skb->len, + GFP_KERNEL); + if (!tx_beacon_cmd) + return -ENOMEM; + + frame_size = priv->beacon_skb->len; /* Set up TX beacon contents */ - frame_size = iwl_fill_beacon_frame(priv, tx_beacon_cmd->frame, - sizeof(frame->u) - sizeof(*tx_beacon_cmd)); - if (WARN_ON_ONCE(frame_size > MAX_MPDU_SIZE)) - return 0; - if (!frame_size) - return 0; + memcpy(tx_beacon_cmd->frame, priv->beacon_skb->data, frame_size); /* Set up TX command fields */ tx_beacon_cmd->tx.len = cpu_to_le16((u16)frame_size); @@ -245,41 +188,16 @@ static unsigned int iwl_hw_get_beacon_cmd(struct iwl_priv *priv, tx_beacon_cmd->tx.rate_n_flags = iwl_hw_set_rate_n_flags(rate, rate_flags); - return sizeof(*tx_beacon_cmd) + frame_size; -} + /* Submit command */ + cmd.len = sizeof(*tx_beacon_cmd) + frame_size; + cmd.data = tx_beacon_cmd; -int iwlagn_send_beacon_cmd(struct iwl_priv *priv) -{ - struct iwl_frame *frame; - unsigned int frame_size; - int rc; - struct iwl_host_cmd cmd = { - .id = REPLY_TX_BEACON, - .flags = CMD_SIZE_HUGE, - }; - - frame = iwl_get_free_frame(priv); - if (!frame) { - IWL_ERR(priv, "Could not obtain free frame buffer for beacon " - "command.\n"); - return -ENOMEM; - } - - frame_size = iwl_hw_get_beacon_cmd(priv, frame); - if (!frame_size) { - IWL_ERR(priv, "Error configuring the beacon command\n"); - iwl_free_frame(priv, frame); - return -EINVAL; - } - - cmd.len = frame_size; - cmd.data = &frame->u.cmd[0]; - - rc = iwl_send_cmd_sync(priv, &cmd); + err = iwl_send_cmd_sync(priv, &cmd); - iwl_free_frame(priv, frame); + /* Free temporary storage */ + kfree(tx_beacon_cmd); - return rc; + return err; } static inline dma_addr_t iwl_tfd_tb_get_addr(struct iwl_tfd *tfd, u8 idx) @@ -2356,9 +2274,6 @@ static void __iwl_down(struct iwl_priv *priv) dev_kfree_skb(priv->beacon_skb); priv->beacon_skb = NULL; - - /* clear out any free frames */ - iwl_clear_free_frames(priv); } static void iwl_down(struct iwl_priv *priv) @@ -3416,8 +3331,6 @@ static int iwl_init_drv(struct iwl_priv *priv) spin_lock_init(&priv->sta_lock); spin_lock_init(&priv->hcmd_lock); - INIT_LIST_HEAD(&priv->free_frames); - mutex_init(&priv->mutex); priv->ieee_channels = NULL; diff --git a/drivers/net/wireless/iwlwifi/iwl-dev.h b/drivers/net/wireless/iwlwifi/iwl-dev.h index 3d28ad2..2fd752a 100644 --- a/drivers/net/wireless/iwlwifi/iwl-dev.h +++ b/drivers/net/wireless/iwlwifi/iwl-dev.h @@ -238,15 +238,6 @@ struct iwl_channel_info { #define IEEE80211_HLEN (IEEE80211_4ADDR_LEN) #define IEEE80211_FRAME_LEN (IEEE80211_DATA_LEN + IEEE80211_HLEN) -struct iwl_frame { - union { - struct ieee80211_hdr frame; - struct iwl_tx_beacon_cmd beacon; - u8 raw[IEEE80211_FRAME_LEN]; - u8 cmd[360]; - } u; - struct list_head list; -}; #define SEQ_TO_SN(seq) (((seq) & IEEE80211_SCTL_SEQ) >> 4) #define SN_TO_SEQ(ssn) (((ssn) << 4) & IEEE80211_SCTL_SEQ) @@ -1188,10 +1179,6 @@ struct iwl_priv { struct ieee80211_rate *ieee_rates; struct iwl_cfg *cfg; - /* temporary frame storage list */ - struct list_head free_frames; - int frames_count; - enum ieee80211_band band; void (*pre_rx_handler)(struct iwl_priv *priv, -- 2.7.4