| Message ID | 1457187017-12913-1-git-send-email-rmanohar@qti.qualcomm.com (mailing list archive) |
|---|---|
| State | Not Applicable |
| Delegated to: | Kalle Valo |
| Headers | show |
On 03/05/2016 06:10 AM, Rajkumar Manoharan wrote: > Firmware reserves few descriptors for management frames transmission. > In 16 MBSSID scenario, these slots will be easy exhausted due to frequent > probe responses. So for 10.4 based solutions, probe responses are limited > by a threshold (24). Do you mean probe requests or probe responses? A single hardware scan request with lots of ssids in it will utilize all firmware tx management frames (which is 5, it seems). In my testing, the firmware would just never send probe requests for the rest of the ssids because the firmware scan state machine logic is broken. If you really do mean responses, then it sounds like it would be better to use the normal RX path for mgt frames in the firmware... Thanks, Ben
On , Ben Greear wrote: > On 03/05/2016 06:10 AM, Rajkumar Manoharan wrote: >> Firmware reserves few descriptors for management frames transmission. >> In 16 MBSSID scenario, these slots will be easy exhausted due to >> frequent >> probe responses. So for 10.4 based solutions, probe responses are >> limited >> by a threshold (24). > > Do you mean probe requests or probe responses? > I meant probe responses in AP mode. > A single hardware scan request with lots of ssids in it will utilize > all > firmware tx management frames (which is 5, it seems). In my testing, > the > firmware would just never send probe requests for the rest of the ssids > because the firmware scan state machine logic is broken. > Hmm... firmware expects both ssid and bssid list to be filled for multiple probe requests. Better to try with different probe spacing time, repeat probe time and probe delay and dwell time as these params change prob_req behavior in firmware. Anyway this change is not related to scan functionality. > If you really do mean responses, then it sounds like it would be better > to > use the normal RX path for mgt frames in the firmware... > Let me clarify. Sending probe responses in AP mode are limited by a threshold for qca99x0 ("ath10k: drop probe responses when too many are queued"). This change moves probe response checks under mgmt_tx from common data path. -Rajkumar -- To unsubscribe from this list: send the line "unsubscribe linux-wireless" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
On 03/05/2016 08:00 PM, Rajkumar Manoharan wrote: > On , Ben Greear wrote: >> On 03/05/2016 06:10 AM, Rajkumar Manoharan wrote: >>> Firmware reserves few descriptors for management frames transmission. >>> In 16 MBSSID scenario, these slots will be easy exhausted due to frequent >>> probe responses. So for 10.4 based solutions, probe responses are limited >>> by a threshold (24). >> >> Do you mean probe requests or probe responses? >> > I meant probe responses in AP mode. > >> A single hardware scan request with lots of ssids in it will utilize all >> firmware tx management frames (which is 5, it seems). In my testing, the >> firmware would just never send probe requests for the rest of the ssids >> because the firmware scan state machine logic is broken. >> > Hmm... firmware expects both ssid and bssid list to be filled for multiple probe > requests. Better to try with different probe spacing time, repeat probe time and > probe delay and dwell time as these params change prob_req behavior in firmware. It was easier to just fix the firmware than to hack the rest of the stack. > Anyway this change is not related to scan functionality. > >> If you really do mean responses, then it sounds like it would be better to >> use the normal RX path for mgt frames in the firmware... >> > Let me clarify. Sending probe responses in AP mode are limited by a threshold > for qca99x0 ("ath10k: drop probe responses when too many are queued"). This change > moves probe response checks under mgmt_tx from common data path. Ok, I'll take a look at that. I've implemented MGT frames over the completely normal HTT data-path transport, so probably I won't hit that in my systems anyway (there should be no internal mgt-frame limitation, except for locally created things like probe requests during scan). But, I could be missing something...I'm really just getting started with 10.4... Thanks, Ben > > -Rajkumar >
On , Ben Greear wrote: > On 03/05/2016 08:00 PM, Rajkumar Manoharan wrote: >> On , Ben Greear wrote: >>> On 03/05/2016 06:10 AM, Rajkumar Manoharan wrote: >>>> Firmware reserves few descriptors for management frames >>>> transmission. >>>> In 16 MBSSID scenario, these slots will be easy exhausted due to >>>> frequent >>>> probe responses. So for 10.4 based solutions, probe responses are >>>> limited >>>> by a threshold (24). >>> >>> Do you mean probe requests or probe responses? >>> >> I meant probe responses in AP mode. >> >>> A single hardware scan request with lots of ssids in it will utilize >>> all >>> firmware tx management frames (which is 5, it seems). In my testing, >>> the >>> firmware would just never send probe requests for the rest of the >>> ssids >>> because the firmware scan state machine logic is broken. >>> >> Hmm... firmware expects both ssid and bssid list to be filled for >> multiple probe >> requests. Better to try with different probe spacing time, repeat >> probe time and >> probe delay and dwell time as these params change prob_req behavior in >> firmware. > > It was easier to just fix the firmware than to hack the > rest of the stack. > I didn't mean to hack the stack :) but scan params should not be constant for all type of scan requests. >> Anyway this change is not related to scan functionality. >> >>> If you really do mean responses, then it sounds like it would be >>> better to >>> use the normal RX path for mgt frames in the firmware... >>> >> Let me clarify. Sending probe responses in AP mode are limited by a >> threshold >> for qca99x0 ("ath10k: drop probe responses when too many are queued"). >> This change >> moves probe response checks under mgmt_tx from common data path. > > Ok, I'll take a look at that. I've implemented MGT frames over the > completely > normal HTT data-path transport, so probably I won't hit that in my > systems > anyway (there should be no internal mgt-frame limitation, except for > locally > created things like probe requests during scan). But, I could be > missing > something...I'm really just getting started with 10.4... > Great.. just noticed that this change needs to be rebased on top of Michal's recent data path series. Let me send next version. -Rajkumar -- To unsubscribe from this list: send the line "unsubscribe linux-wireless" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
diff --git a/drivers/net/wireless/ath/ath10k/htt.h b/drivers/net/wireless/ath/ath10k/htt.h index 13391ea..b611c2b 100644 --- a/drivers/net/wireless/ath/ath10k/htt.h +++ b/drivers/net/wireless/ath/ath10k/htt.h @@ -1753,7 +1753,7 @@ int ath10k_htt_h2t_aggr_cfg_msg(struct ath10k_htt *htt, u8 max_subfrms_amsdu); void ath10k_htt_hif_tx_complete(struct ath10k *ar, struct sk_buff *skb); -void __ath10k_htt_tx_dec_pending(struct ath10k_htt *htt, bool limit_mgmt_desc); +void __ath10k_htt_tx_dec_pending(struct ath10k_htt *htt); int ath10k_htt_tx_alloc_msdu_id(struct ath10k_htt *htt, struct sk_buff *skb); void ath10k_htt_tx_free_msdu_id(struct ath10k_htt *htt, u16 msdu_id); int ath10k_htt_mgmt_tx(struct ath10k_htt *htt, struct sk_buff *); diff --git a/drivers/net/wireless/ath/ath10k/htt_rx.c b/drivers/net/wireless/ath/ath10k/htt_rx.c index ae9b686..7d1a0f2 100644 --- a/drivers/net/wireless/ath/ath10k/htt_rx.c +++ b/drivers/net/wireless/ath/ath10k/htt_rx.c @@ -2049,7 +2049,12 @@ void ath10k_htt_t2h_msg_handler(struct ath10k *ar, struct sk_buff *skb) break; } - ath10k_txrx_tx_unref(htt, &tx_done); + status = ath10k_txrx_tx_unref(htt, &tx_done); + if (!status) { + spin_lock_bh(&htt->tx_lock); + htt->num_pending_mgmt_tx--; + spin_unlock_bh(&htt->tx_lock); + } break; } case HTT_T2H_MSG_TYPE_TX_COMPL_IND: diff --git a/drivers/net/wireless/ath/ath10k/htt_tx.c b/drivers/net/wireless/ath/ath10k/htt_tx.c index 95acb72..6a29b802 100644 --- a/drivers/net/wireless/ath/ath10k/htt_tx.c +++ b/drivers/net/wireless/ath/ath10k/htt_tx.c @@ -22,28 +22,22 @@ #include "txrx.h" #include "debug.h" -void __ath10k_htt_tx_dec_pending(struct ath10k_htt *htt, bool limit_mgmt_desc) +void __ath10k_htt_tx_dec_pending(struct ath10k_htt *htt) { - if (limit_mgmt_desc) - htt->num_pending_mgmt_tx--; - htt->num_pending_tx--; if (htt->num_pending_tx == htt->max_num_pending_tx - 1) ath10k_mac_tx_unlock(htt->ar, ATH10K_TX_PAUSE_Q_FULL); } -static void ath10k_htt_tx_dec_pending(struct ath10k_htt *htt, - bool limit_mgmt_desc) +static void ath10k_htt_tx_dec_pending(struct ath10k_htt *htt) { spin_lock_bh(&htt->tx_lock); - __ath10k_htt_tx_dec_pending(htt, limit_mgmt_desc); + __ath10k_htt_tx_dec_pending(htt); spin_unlock_bh(&htt->tx_lock); } -static int ath10k_htt_tx_inc_pending(struct ath10k_htt *htt, - bool limit_mgmt_desc, bool is_probe_resp) +static int ath10k_htt_tx_inc_pending(struct ath10k_htt *htt) { - struct ath10k *ar = htt->ar; int ret = 0; spin_lock_bh(&htt->tx_lock); @@ -53,15 +47,6 @@ static int ath10k_htt_tx_inc_pending(struct ath10k_htt *htt, goto exit; } - if (limit_mgmt_desc) { - if (is_probe_resp && (htt->num_pending_mgmt_tx > - ar->hw_params.max_probe_resp_desc_thres)) { - ret = -EBUSY; - goto exit; - } - htt->num_pending_mgmt_tx++; - } - htt->num_pending_tx++; if (htt->num_pending_tx == htt->max_num_pending_tx) ath10k_mac_tx_lock(htt->ar, ATH10K_TX_PAUSE_Q_FULL); @@ -576,17 +561,21 @@ int ath10k_htt_mgmt_tx(struct ath10k_htt *htt, struct sk_buff *msdu) int msdu_id = -1; int res; struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)msdu->data; - bool limit_mgmt_desc = false; - bool is_probe_resp = false; - - if (ar->hw_params.max_probe_resp_desc_thres) { - limit_mgmt_desc = true; - if (ieee80211_is_probe_resp(hdr->frame_control)) - is_probe_resp = true; + if (ar->hw_params.max_probe_resp_desc_thres && + ieee80211_is_probe_resp(hdr->frame_control)) { + spin_lock_bh(&htt->tx_lock); + if ((htt->num_pending_mgmt_tx > + ar->hw_params.max_probe_resp_desc_thres)) { + spin_unlock_bh(&htt->tx_lock); + res = -EBUSY; + goto err; + } + htt->num_pending_mgmt_tx++; + spin_unlock_bh(&htt->tx_lock); } - res = ath10k_htt_tx_inc_pending(htt, limit_mgmt_desc, is_probe_resp); + res = ath10k_htt_tx_inc_pending(htt); if (res) goto err; @@ -650,7 +639,10 @@ err_free_msdu_id: ath10k_htt_tx_free_msdu_id(htt, msdu_id); spin_unlock_bh(&htt->tx_lock); err_tx_dec: - ath10k_htt_tx_dec_pending(htt, limit_mgmt_desc); + spin_lock_bh(&htt->tx_lock); + htt->num_pending_mgmt_tx--; + spin_unlock_bh(&htt->tx_lock); + ath10k_htt_tx_dec_pending(htt); err: return res; } @@ -677,18 +669,8 @@ int ath10k_htt_tx(struct ath10k_htt *htt, enum ath10k_hw_txrx_mode txmode, u32 frags_paddr = 0; u32 txbuf_paddr; struct htt_msdu_ext_desc *ext_desc = NULL; - bool limit_mgmt_desc = false; - bool is_probe_resp = false; - - if (unlikely(ieee80211_is_mgmt(hdr->frame_control)) && - ar->hw_params.max_probe_resp_desc_thres) { - limit_mgmt_desc = true; - - if (ieee80211_is_probe_resp(hdr->frame_control)) - is_probe_resp = true; - } - res = ath10k_htt_tx_inc_pending(htt, limit_mgmt_desc, is_probe_resp); + res = ath10k_htt_tx_inc_pending(htt); if (res) goto err; @@ -866,7 +848,7 @@ err_free_msdu_id: ath10k_htt_tx_free_msdu_id(htt, msdu_id); spin_unlock_bh(&htt->tx_lock); err_tx_dec: - ath10k_htt_tx_dec_pending(htt, limit_mgmt_desc); + ath10k_htt_tx_dec_pending(htt); err: return res; } diff --git a/drivers/net/wireless/ath/ath10k/txrx.c b/drivers/net/wireless/ath/ath10k/txrx.c index fbfb608..476de08 100644 --- a/drivers/net/wireless/ath/ath10k/txrx.c +++ b/drivers/net/wireless/ath/ath10k/txrx.c @@ -49,15 +49,14 @@ out: spin_unlock_bh(&ar->data_lock); } -void ath10k_txrx_tx_unref(struct ath10k_htt *htt, - const struct htt_tx_done *tx_done) +int ath10k_txrx_tx_unref(struct ath10k_htt *htt, + const struct htt_tx_done *tx_done) { struct ath10k *ar = htt->ar; struct device *dev = ar->dev; struct ieee80211_tx_info *info; struct ath10k_skb_cb *skb_cb; struct sk_buff *msdu; - bool limit_mgmt_desc = false; ath10k_dbg(ar, ATH10K_DBG_HTT, "htt tx completion msdu_id %u discard %d no_ack %d success %d\n", @@ -67,7 +66,7 @@ void ath10k_txrx_tx_unref(struct ath10k_htt *htt, if (tx_done->msdu_id >= htt->max_num_pending_tx) { ath10k_warn(ar, "warning: msdu_id %d too big, ignoring\n", tx_done->msdu_id); - return; + return -EINVAL; } spin_lock_bh(&htt->tx_lock); @@ -76,17 +75,13 @@ void ath10k_txrx_tx_unref(struct ath10k_htt *htt, ath10k_warn(ar, "received tx completion for invalid msdu_id: %d\n", tx_done->msdu_id); spin_unlock_bh(&htt->tx_lock); - return; + return -ENOENT; } skb_cb = ATH10K_SKB_CB(msdu); - if (unlikely(skb_cb->flags & ATH10K_SKB_F_MGMT) && - ar->hw_params.max_probe_resp_desc_thres) - limit_mgmt_desc = true; - ath10k_htt_tx_free_msdu_id(htt, tx_done->msdu_id); - __ath10k_htt_tx_dec_pending(htt, limit_mgmt_desc); + __ath10k_htt_tx_dec_pending(htt); if (htt->num_pending_tx == 0) wake_up(&htt->empty_tx_wq); spin_unlock_bh(&htt->tx_lock); @@ -101,7 +96,7 @@ void ath10k_txrx_tx_unref(struct ath10k_htt *htt, if (tx_done->discard) { ieee80211_free_txskb(htt->ar->hw, msdu); - return; + return 0; } if (!(info->flags & IEEE80211_TX_CTL_NO_ACK)) @@ -115,6 +110,7 @@ void ath10k_txrx_tx_unref(struct ath10k_htt *htt, ieee80211_tx_status(htt->ar->hw, msdu); /* we do not own the msdu anymore */ + return 0; } struct ath10k_peer *ath10k_peer_find(struct ath10k *ar, int vdev_id, diff --git a/drivers/net/wireless/ath/ath10k/txrx.h b/drivers/net/wireless/ath/ath10k/txrx.h index a90e09f..e7ea1ae 100644 --- a/drivers/net/wireless/ath/ath10k/txrx.h +++ b/drivers/net/wireless/ath/ath10k/txrx.h @@ -19,8 +19,8 @@ #include "htt.h" -void ath10k_txrx_tx_unref(struct ath10k_htt *htt, - const struct htt_tx_done *tx_done); +int ath10k_txrx_tx_unref(struct ath10k_htt *htt, + const struct htt_tx_done *tx_done); struct ath10k_peer *ath10k_peer_find(struct ath10k *ar, int vdev_id, const u8 *addr);
Firmware reserves few descriptors for management frames transmission. In 16 MBSSID scenario, these slots will be easy exhausted due to frequent probe responses. So for 10.4 based solutions, probe responses are limited by a threshold (24). management tx path is separate for all except tlv based solutions. Since tlv solutions (qca6174 & qca9377) do not support 16 AP interfaces, it is safe to move management descriptor limitation check under mgmt_tx function. Though CPU improvement is negligible, unlikely conditions or never hit conditions in hot path can be avoided on data transmission. Signed-off-by: Rajkumar Manoharan <rmanohar@qti.qualcomm.com> --- drivers/net/wireless/ath/ath10k/htt.h | 2 +- drivers/net/wireless/ath/ath10k/htt_rx.c | 7 +++- drivers/net/wireless/ath/ath10k/htt_tx.c | 62 ++++++++++++-------------------- drivers/net/wireless/ath/ath10k/txrx.c | 18 ++++------ drivers/net/wireless/ath/ath10k/txrx.h | 4 +-- 5 files changed, 38 insertions(+), 55 deletions(-)