From 49c9cd26445aa8bc8348c384c943b758c57c47a9 Mon Sep 17 00:00:00 2001 From: Arik Nemtsov Date: Tue, 28 Feb 2012 00:41:31 +0200 Subject: [PATCH] wl12xx: avoid starving the system hlid Re-factor the Tx scheduler so that the system_hlid is taken into account before restarting an iteration over the wlvifs. Previously this hlid had a lower priority and would starve if some wlvif had many packets. In addition avoid iterating over wlvifs past last_wlvif when performing the a second pass. If we had packets in those wlvifs they would have been found earlier. Signed-off-by: Arik Nemtsov Signed-off-by: Luciano Coelho --- drivers/net/wireless/wl12xx/tx.c | 17 +++++++++++++---- 1 file changed, 13 insertions(+), 4 deletions(-) diff --git a/drivers/net/wireless/wl12xx/tx.c b/drivers/net/wireless/wl12xx/tx.c index 8f5ab04..6640c39 100644 --- a/drivers/net/wireless/wl12xx/tx.c +++ b/drivers/net/wireless/wl12xx/tx.c @@ -572,6 +572,7 @@ static struct sk_buff *wl1271_skb_dequeue(struct wl1271 *wl) struct wl12xx_vif *wlvif = wl->last_wlvif; struct sk_buff *skb = NULL; + /* continue from last wlvif (round robin) */ if (wlvif) { wl12xx_for_each_wlvif_continue(wl, wlvif) { skb = wl12xx_vif_skb_dequeue(wl, wlvif); @@ -582,7 +583,11 @@ static struct sk_buff *wl1271_skb_dequeue(struct wl1271 *wl) } } - /* do another pass */ + /* dequeue from the system HLID before the restarting wlvif list */ + if (!skb) + skb = wl12xx_lnk_skb_dequeue(wl, &wl->links[wl->system_hlid]); + + /* do a new pass over the wlvif list */ if (!skb) { wl12xx_for_each_wlvif(wl, wlvif) { skb = wl12xx_vif_skb_dequeue(wl, wlvif); @@ -590,12 +595,16 @@ static struct sk_buff *wl1271_skb_dequeue(struct wl1271 *wl) wl->last_wlvif = wlvif; break; } + + /* + * No need to continue after last_wlvif. The previous + * pass should have found it. + */ + if (wlvif == wl->last_wlvif) + break; } } - if (!skb) - skb = wl12xx_lnk_skb_dequeue(wl, &wl->links[wl->system_hlid]); - if (!skb && test_and_clear_bit(WL1271_FLAG_DUMMY_PACKET_PENDING, &wl->flags)) { int q; -- 2.7.4