diff options
| author | Ido Yariv <ido@wizery.com> | 2010-10-12 16:20:06 +0200 |
|---|---|---|
| committer | John W. Linville <linville@tuxdriver.com> | 2010-11-15 13:25:06 -0500 |
| commit | 25eeb9e3876a161e3afcc820c6cb72e13f9b7c7e (patch) | |
| tree | 433aef6e8bc0ec254c99ebbfce150cb104078185 /drivers/net/wireless/wl12xx/wl1271_tx.c | |
| parent | a522550a283de31c7cfc30c7a129ce584e38c582 (diff) | |
| download | talos-op-linux-25eeb9e3876a161e3afcc820c6cb72e13f9b7c7e.tar.gz talos-op-linux-25eeb9e3876a161e3afcc820c6cb72e13f9b7c7e.zip | |
wl1271: Allocate TX descriptors more efficiently
On each TX descriptor allocation, a free entry is found by traversing the TX
descriptors array.
Improve this by holding a bitmap of all TX descriptors, and using efficient
bit operations to search for free entries.
Signed-off-by: Ido Yariv <ido@wizery.com>
Reviewed-by: Juuso Oikarinen <juuso.oikarinen@nokia.com>
Signed-off-by: Luciano Coelho <luciano.coelho@nokia.com>
Diffstat (limited to 'drivers/net/wireless/wl12xx/wl1271_tx.c')
| -rw-r--r-- | drivers/net/wireless/wl12xx/wl1271_tx.c | 38 |
1 files changed, 22 insertions, 16 deletions
diff --git a/drivers/net/wireless/wl12xx/wl1271_tx.c b/drivers/net/wireless/wl12xx/wl1271_tx.c index cf32a77a4ff5..85878e5e7526 100644 --- a/drivers/net/wireless/wl12xx/wl1271_tx.c +++ b/drivers/net/wireless/wl12xx/wl1271_tx.c @@ -30,17 +30,26 @@ #include "wl1271_ps.h" #include "wl1271_tx.h" -static int wl1271_tx_id(struct wl1271 *wl, struct sk_buff *skb) +static int wl1271_alloc_tx_id(struct wl1271 *wl, struct sk_buff *skb) { - int i; - for (i = 0; i < ACX_TX_DESCRIPTORS; i++) - if (wl->tx_frames[i] == NULL) { - wl->tx_frames[i] = skb; - wl->tx_frames_cnt++; - return i; - } + int id; + + id = find_first_zero_bit(wl->tx_frames_map, ACX_TX_DESCRIPTORS); + if (id >= ACX_TX_DESCRIPTORS) + return -EBUSY; + + __set_bit(id, wl->tx_frames_map); + wl->tx_frames[id] = skb; + wl->tx_frames_cnt++; + return id; +} - return -EBUSY; +static void wl1271_free_tx_id(struct wl1271 *wl, int id) +{ + if (__test_and_clear_bit(id, wl->tx_frames_map)) { + wl->tx_frames[id] = NULL; + wl->tx_frames_cnt--; + } } static int wl1271_tx_allocate(struct wl1271 *wl, struct sk_buff *skb, u32 extra, @@ -55,7 +64,7 @@ static int wl1271_tx_allocate(struct wl1271 *wl, struct sk_buff *skb, u32 extra, return -EAGAIN; /* allocate free identifier for the packet */ - id = wl1271_tx_id(wl, skb); + id = wl1271_alloc_tx_id(wl, skb); if (id < 0) return id; @@ -79,8 +88,7 @@ static int wl1271_tx_allocate(struct wl1271 *wl, struct sk_buff *skb, u32 extra, "tx_allocate: size: %d, blocks: %d, id: %d", total_len, total_blocks, id); } else { - wl->tx_frames[id] = NULL; - wl->tx_frames_cnt--; + wl1271_free_tx_id(wl, id); } return ret; @@ -352,8 +360,7 @@ static void wl1271_tx_complete_packet(struct wl1271 *wl, /* return the packet to the stack */ ieee80211_tx_status(wl->hw, skb); - wl->tx_frames[result->id] = NULL; - wl->tx_frames_cnt--; + wl1271_free_tx_id(wl, result->id); } /* Called upon reception of a TX complete interrupt */ @@ -422,11 +429,10 @@ void wl1271_tx_reset(struct wl1271 *wl) for (i = 0; i < ACX_TX_DESCRIPTORS; i++) if (wl->tx_frames[i] != NULL) { skb = wl->tx_frames[i]; - wl->tx_frames[i] = NULL; + wl1271_free_tx_id(wl, i); wl1271_debug(DEBUG_TX, "freeing skb 0x%p", skb); ieee80211_tx_status(wl->hw, skb); } - wl->tx_frames_cnt = 0; } #define WL1271_TX_FLUSH_TIMEOUT 500000 |
