Hi all, I dug a little more on this problem and I found that hardware encryption is disabled after the first roam because ieee80211_key_enable_hw_accel fails on the following test : if (sta && !sta->uploaded) goto out_unsupported; After the first roam, sta->uploaded is tested before sta_info_move_state sets it to true. At the first association/authentication : 1) sta_info_move_state sets sta->uploaded to true 2) ieee80211_key_enable_hw_accel test it and find it true --> hardware decoding When the station changes from an AP to another : 1) ieee80211_key_enable_hw_accel test it and find it false --> software decoding 2) sta_info_move_state sets sta->uploaded to true Please find below a log showing the callstack when setting sta->uploaded to true or testing it to be false. Initial association with 90:a4:de:aa:42:94 ========================================== [ 31.476547] wlan0: authenticate with 90:a4:de:aa:42:94 [ 31.485307] wlan0: send auth to 90:a4:de:aa:42:94 (try 1/3) [ 31.493419] wlan0: authenticated [ 31.515858] wlan0: associate with 90:a4:de:aa:42:94 (try 1/3) [ 31.531967] wlan0: RX AssocResp from 90:a4:de:aa:42:94 (capab=0x11 status=0 aid=1) [ 31.539870] Set set sta->uploaded to true Call Trace: [ 31.546413] [c783bd00] [c0008178] show_stack+0x4c/0x158 (unreliable) [ 31.552943] [c783bd40] [c9162d00] sta_info_move_state+0x150/0x334 [mac80211] [ 31.560106] [c783bd60] [c918fea8] cleanup_module+0x338/0x26d0 [mac80211] [ 31.566916] [c783be20] [c9181124] ieee80211_sta_rx_notify+0x1e8/0x250 [mac80211] [ 31.574423] [c783bee0] [c9181688] ieee80211_sta_rx_queued_mgmt+0x464/0x548 [mac80211] [ 31.582363] [c783bf10] [c916b964] ieee80211_ibss_leave+0x162c/0x16cc [mac80211] [ 31.589745] [c783bf50] [c00302d4] process_one_work+0x1f0/0x344 [ 31.595629] [c783bf80] [c0030da0] worker_thread+0x1b8/0x2d0 [ 31.601265] [c783bfb0] [c0034d48] kthread+0x80/0x84 [ 31.606206] [c783bff0] [c000d324] kernel_thread+0x4c/0x68 [ 31.611877] wlan0: associated [ 35.916785] Test sta->uploaded (successful) [ 35.922490] Test sta->uploaded (successful) Roaming to 90:a4:de:aa:41:ed ============================ [ 85.789911] wlan0: authenticate with 90:a4:de:aa:41:ed [ 85.798547] wlan0: send auth to 90:a4:de:aa:41:ed (try 1/3) [ 85.811848] wlan0: authenticated [ 85.821399] Test sta->uploaded not successful Call Trace: [ 85.828395] [c7247b10] [c0008178] show_stack+0x4c/0x158 (unreliable) [ 85.834901] [c7247b50] [c917ab24] ieee80211_iter_keys+0x1b8/0x2f4 [mac80211] [ 85.842062] [c7247b70] [c917b338] ieee80211_key_link+0x10c/0x150 [mac80211] [ 85.849153] [c7247b90] [c9171084] ieee80211_aes_cmac_key_free+0x2424/0x3780 [mac80211] [ 85.857200] [c7247bb0] [c90df3a8] cfg80211_probe_status+0x2f58/0x69a4 [cfg80211] [ 85.864659] [c7247bf0] [c01e6f40] genl_rcv_msg+0x1d0/0x20c [ 85.870198] [c7247c40] [c01e6384] netlink_rcv_skb+0x64/0xd4 [ 85.875850] [c7247c60] [c01e6d5c] genl_rcv+0x28/0x3c [ 85.880873] [c7247c70] [c01e5db0] netlink_unicast+0x160/0x200 [ 85.886668] [c7247cb0] [c01e6140] netlink_sendmsg+0x224/0x2a0 [ 85.892477] [c7247d00] [c01b530c] sock_sendmsg+0x8c/0xa8 [ 85.897845] [c7247dd0] [c01b643c] __sys_sendmsg+0x1fc/0x2c0 [ 85.903472] [c7247ef0] [c01b7e00] sys_sendmsg+0x40/0x74 [ 85.908781] [c7247f40] [c000e5c4] ret_from_syscall+0x0/0x38 [ 85.914460] --- Exception: c01 at 0x48272594 [ 85.914472] LR = 0x48294b64 [ 85.927994] wlan0: associate with 90:a4:de:aa:41:ed (try 1/3) [ 85.938062] wlan0: RX AssocResp from 90:a4:de:aa:41:ed (capab=0x11 status=0 aid=1) [ 85.945767] Set set sta->uploaded to true Call Trace: [ 85.952347] [c783bd00] [c0008178] show_stack+0x4c/0x158 (unreliable) [ 85.958851] [c783bd40] [c9162d00] sta_info_move_state+0x150/0x334 [mac80211] [ 85.966034] [c783bd60] [c918fea8] cleanup_module+0x338/0x26d0 [mac80211] [ 85.972852] [c783be20] [c9181124] ieee80211_sta_rx_notify+0x1e8/0x250 [mac80211] [ 85.980360] [c783bee0] [c9181688] ieee80211_sta_rx_queued_mgmt+0x464/0x548 [mac80211] [ 85.988300] [c783bf10] [c916b964] ieee80211_ibss_leave+0x162c/0x16cc [mac80211] [ 85.995678] [c783bf50] [c00302d4] process_one_work+0x1f0/0x344 [ 86.001568] [c783bf80] [c0030da0] worker_thread+0x1b8/0x2d0 [ 86.007197] [c783bfb0] [c0034d48] kthread+0x80/0x84 [ 86.012141] [c783bff0] [c000d324] kernel_thread+0x4c/0x68 [ 86.017755] wlan0: associated [ 86.036470] Test sta->uploaded At this state I am not sure where the problem is located : kernel or wpa_supplicant Can someone provide me with a hit on how to work it out ? Wireless driver : ath9k (AR9160) Compat-Wireless = 2012-09-07 (OpenWRT package) WPA_Supplicant = 20120910 (OpenWRT package) Linux Kernel : 3.3.8 Thank in advance, Cédric DEBARGE -----Message d'origine----- De : Cedric Debarge Envoyé : mercredi 26 décembre 2012 11:10 À : linux-wireless@xxxxxxxxxxxxxxx Objet : missing RX_FLAG_DECRIPTED in ieee80211_rx_status after first reassociation in 802.11R Hi all, I am not sure if this is the right place to post my question. Please forgive me if not. I am experiencing performance issue with 802.11R roaming between two AP with wpa_supplicant ( WPA2 + EAP-TLS). When wpa_supplicant leaves the first AP and successfully associates and authenticates with the second one, data frames coming undecrypted from the radio card (RX_FLAG_DECRIPTED flag not set in ieee80211_rx_status) and consumes a lot of CPU time in ieee80211_rx_h_decrypt to decrypt it. status->flag at the beginning of ieee80211_rx_h_decrypt : 0x282 (RX_FLAG_HT | RX_FLAG_MACTIME_MPDU | RX_FLAG_DECRYPTED) before the first roam 0x280 (RX_FLAG_HT | RX_FLAG_MACTIME_MPDU) after the first roam Is this behavior correct ? if not, can you give me some clue how to work it out ? I can provide wpa_supplicant logs if needed. Wireless driver : ath9k (AR9160) Compat-Wireless = 2012-09-07 (OpenWRT package) WPA_Supplicant = 20120910 (OpenWRT package) Linux Kernel : 3.3.8 Thank in advance. Best regards, Cédric DEBARGE -- To unsubscribe from this list: send the line "unsubscribe linux-wireless" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
