[PATCH] wifi: ath11k: fix wrong handling of CCMP256 and GCMP ciphers

[Jeff Johnson]

On 5/30/2024 7:12 PM, Baochen Qiang wrote:
> Currently for CCMP256, GCMP128 and GCMP256 ciphers, in ath11k_install_key()
> IEEE80211_KEY_FLAG_GENERATE_IV_MGMT is not set. And in ath11k_mac_mgmt_tx_wmi()
> a length of IEEE80211_CCMP_MIC_LEN is reserved for all ciphers.
> 
> This results in unexpected management frame drop in case either of above 3 ciphers
> is used. The reason is, without IEEE80211_KEY_FLAG_GENERATE_IV_MGMT set, mac80211
> will not generate CCMP/GCMP headers in frame for ath11k. Also MIC length reserved
> is wrong. Such frame is dropped later by hardware:
> 
> ath11k_pci 0000:5a:00.0: mac tx mgmt frame, buf id 0
> ath11k_pci 0000:5a:00.0: mgmt tx compl ev pdev_id 1, desc_id 0, status 1
> 
> From user point of view, we have observed very low throughput due to this issue:
> action frames are all dropped so ADDBA response from DUT never reaches AP. AP
> can not use aggregation thus throughput is low.
> 
> Fix this by setting IEEE80211_KEY_FLAG_GENERATE_IV_MGMT flag and by reserving proper
> MIC length for those ciphers.
> 
> Tested-on: WCN6855 hw2.0 PCI WLAN.HSP.1.1-03125-QCAHSPSWPL_V1_V2_SILICONZ_LITE-3.6510.30
> Tested-on: QCN9074 hw1.0 PCI WLAN.HK.2.7.0.1-01744-QCAHKSWPL_SILICONZ-1
> 
> Fixes: d5c65159f289 ("ath11k: driver for Qualcomm IEEE 802.11ax devices")
> Signed-off-by: Baochen Qiang <quic_bqiang at quicinc.com>
Acked-by: Jeff Johnson <quic_jjohnson at quicinc.com>