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    Subject[PATCH v2] net: wireless: wlcore: fix support for IGTK key
    Date
    Changeset 2b7aadd3b9e1 ("wlcore: Adding suppoprt for IGTK key in wlcore driver")
    added support for AEC CMAC cipher suite.

    However, this only works with the very newest firmware version
    (8.9.0.0.83). Such firmware weren't even pushed to linux-firmware
    git tree yet:

    https://git.ti.com/cgit/wilink8-wlan/wl18xx_fw/log/

    Due to that, it causes a regression betwen Kernel 5.7 and 5.8:
    with such patch applied, WiFi stops working, and the Kernel starts
    printing this message every second:

    wlcore: PHY firmware version: Rev 8.2.0.0.242
    wlcore: firmware booted (Rev 8.9.0.0.79)
    wlcore: ERROR command execute failure 14
    ------------[ cut here ]------------
    WARNING: CPU: 0 PID: 133 at drivers/net/wireless/ti/wlcore/main.c:795 wl12xx_queue_recovery_work.part.0+0x6c/0x74 [wlcore]
    Modules linked in: wl18xx wlcore mac80211 libarc4 cfg80211 rfkill snd_soc_hdmi_codec crct10dif_ce wlcore_sdio adv7511 cec kirin9xx_drm(C) kirin9xx_dw_drm_dsi(C) drm_kms_helper drm ip_tables x_tables ipv6 nf_defrag_ipv6
    CPU: 0 PID: 133 Comm: kworker/0:1 Tainted: G WC 5.8.0+ #186
    Hardware name: HiKey970 (DT)
    Workqueue: events_freezable ieee80211_restart_work [mac80211]
    pstate: 60000005 (nZCv daif -PAN -UAO BTYPE=--)
    pc : wl12xx_queue_recovery_work.part.0+0x6c/0x74 [wlcore]
    lr : wl12xx_queue_recovery_work+0x24/0x30 [wlcore]
    sp : ffff8000126c3a60
    x29: ffff8000126c3a60 x28: 00000000000025de
    x27: 0000000000000010 x26: 0000000000000005
    x25: ffff0001a5d49e80 x24: ffff8000092cf580
    x23: ffff0001b7c12623 x22: ffff0001b6fcf2e8
    x21: ffff0001b7e46200 x20: 00000000fffffffb
    x19: ffff0001a78e6400 x18: 0000000000000030
    x17: 0000000000000001 x16: 0000000000000001
    x15: ffff0001b7e46670 x14: ffffffffffffffff
    x13: ffff8000926c37d7 x12: ffff8000126c37e0
    x11: ffff800011e01000 x10: ffff8000120526d0
    x9 : 0000000000000000 x8 : 3431206572756c69
    x7 : 6166206574756365 x6 : 0000000000000c2c
    x5 : 0000000000000000 x4 : ffff0001bf1361e8
    x3 : ffff0001bf1790b0 x2 : 0000000000000000
    x1 : ffff0001a5d49e80 x0 : 0000000000000001
    Call trace:
    wl12xx_queue_recovery_work.part.0+0x6c/0x74 [wlcore]
    wl12xx_queue_recovery_work+0x24/0x30 [wlcore]
    wl1271_cmd_set_sta_key+0x258/0x25c [wlcore]
    wl1271_set_key+0x7c/0x2dc [wlcore]
    wlcore_set_key+0xe4/0x360 [wlcore]
    wl18xx_set_key+0x48/0x1d0 [wl18xx]
    wlcore_op_set_key+0xa4/0x180 [wlcore]
    ieee80211_key_enable_hw_accel+0xb0/0x2d0 [mac80211]
    ieee80211_reenable_keys+0x70/0x110 [mac80211]
    ieee80211_reconfig+0xa00/0xca0 [mac80211]
    ieee80211_restart_work+0xc4/0xfc [mac80211]
    process_one_work+0x1cc/0x350
    worker_thread+0x13c/0x470
    kthread+0x154/0x160
    ret_from_fork+0x10/0x30
    ---[ end trace b1f722abf9af5919 ]---
    wlcore: WARNING could not set keys
    wlcore: ERROR Could not add or replace key
    wlan0: failed to set key (4, ff:ff:ff:ff:ff:ff) to hardware (-5)
    wlcore: Hardware recovery in progress. FW ver: Rev 8.9.0.0.79
    wlcore: pc: 0x0, hint_sts: 0x00000040 count: 39
    wlcore: down
    wlcore: down
    ieee80211 phy0: Hardware restart was requested
    mmc_host mmc0: Bus speed (slot 0) = 400000Hz (slot req 400000Hz, actual 400000HZ div = 0)
    mmc_host mmc0: Bus speed (slot 0) = 25000000Hz (slot req 25000000Hz, actual 25000000HZ div = 0)
    wlcore: PHY firmware version: Rev 8.2.0.0.242
    wlcore: firmware booted (Rev 8.9.0.0.79)
    wlcore: ERROR command execute failure 14
    ------------[ cut here ]------------

    Fix it by adding some code that will check if the firmware version
    is at least version 8.9.0.0.83.

    Tested on Hikey 970.

    Fixes: 2b7aadd3b9e1 ("wlcore: Adding suppoprt for IGTK key in wlcore driver")
    Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
    ---

    Hi Raz,

    Maybe this patch could be useful once firmware 8.9.0.0.83 is released.

    v2: change it to require minimal verson 8.9.0.0.83 for IGTK key

    drivers/net/wireless/ti/wlcore/main.c | 48 +++++++++++++++++++++++++
    drivers/net/wireless/ti/wlcore/wlcore.h | 2 ++
    2 files changed, 50 insertions(+)

    diff --git a/drivers/net/wireless/ti/wlcore/main.c b/drivers/net/wireless/ti/wlcore/main.c
    index de6c8a7589ca..4332eaa1a733 100644
    --- a/drivers/net/wireless/ti/wlcore/main.c
    +++ b/drivers/net/wireless/ti/wlcore/main.c
    @@ -14,6 +14,7 @@
    #include <linux/irq.h>
    #include <linux/pm_runtime.h>
    #include <linux/pm_wakeirq.h>
    +#include <linux/ctype.h>

    #include "wlcore.h"
    #include "debug.h"
    @@ -1082,6 +1083,45 @@ static int wl12xx_chip_wakeup(struct wl1271 *wl, bool plt)
    return ret;
    }

    +static bool wl1271_check_aes_cmac_cypher(struct wl1271 *wl)
    +{
    + int ver[5] = { };
    + int ret;
    + const char *p = wl->chip.fw_ver_str;
    +
    +
    + /* The string starts with "Rev ". Ignore it */
    + while (*p && !isdigit(*p))
    + p++;
    +
    + ret = sscanf(p, "%d.%d.%d.%d.%d",
    + &ver[0], &ver[1], &ver[2], &ver[3], &ver[4]);
    +
    + if (ret != ARRAY_SIZE(ver)) {
    + wl1271_info("Parsed version: %d.%d.%d.%d.%d\n",
    + ver[0], ver[1], ver[2], ver[3], ver[4]);
    + wl1271_error("Couldn't parse firmware version string: %d\n", ret);
    + return false;
    + }
    +
    + /*
    + * Only versions equal (and probably above) 8.9.0.0.83
    + * supports such feature.
    + */
    + if (ver[0] < 8)
    + return false;
    + if (ver[1] < 9)
    + return false;
    + if (ver[2] > 0)
    + return true;
    + if (ver[3] > 0)
    + return true;
    + if (ver[4] >= 83)
    + return true;
    +
    + return false;
    +}
    +
    int wl1271_plt_start(struct wl1271 *wl, const enum plt_mode plt_mode)
    {
    int retries = WL1271_BOOT_RETRIES;
    @@ -1133,6 +1173,8 @@ int wl1271_plt_start(struct wl1271 *wl, const enum plt_mode plt_mode)
    strncpy(wiphy->fw_version, wl->chip.fw_ver_str,
    sizeof(wiphy->fw_version));

    + wl->has_aes_cmac_cipher = wl1271_check_aes_cmac_cypher(wl);
    +
    goto out;

    power_off:
    @@ -2358,6 +2400,8 @@ static int wl12xx_init_fw(struct wl1271 *wl)
    strncpy(wiphy->fw_version, wl->chip.fw_ver_str,
    sizeof(wiphy->fw_version));

    + wl->has_aes_cmac_cipher = wl1271_check_aes_cmac_cypher(wl);
    +
    /*
    * Now we know if 11a is supported (info from the NVS), so disable
    * 11a channels if not supported
    @@ -3551,6 +3595,10 @@ int wlcore_set_key(struct wl1271 *wl, enum set_key_cmd cmd,
    key_type = KEY_GEM;
    break;
    case WLAN_CIPHER_SUITE_AES_CMAC:
    + if (!wl->has_aes_cmac_cipher) {
    + wl1271_error("AEC CMAC cipher not available on this firmware version\n");
    + return -EOPNOTSUPP;
    + }
    key_type = KEY_IGTK;
    break;
    default:
    diff --git a/drivers/net/wireless/ti/wlcore/wlcore.h b/drivers/net/wireless/ti/wlcore/wlcore.h
    index b7821311ac75..26a2bd9b2df1 100644
    --- a/drivers/net/wireless/ti/wlcore/wlcore.h
    +++ b/drivers/net/wireless/ti/wlcore/wlcore.h
    @@ -213,6 +213,8 @@ struct wl1271 {
    void *nvs;
    size_t nvs_len;

    + u32 has_aes_cmac_cipher:1;
    +
    s8 hw_pg_ver;

    /* address read from the fuse ROM */
    --
    2.26.2

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