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+From patchwork Mon Mar 10 13:28:18 2025
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+ Mon, 10 Mar 2025 06:28:45 -0700 (PDT)
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+From: Mantas Pucka <[email protected]>
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+Date: Mon, 10 Mar 2025 15:28:18 +0200
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+Subject: [PATCH ath-next] wifi: ath12k: limit WMI_SCAN_CHAN_LIST_CMDID
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+ argument size
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+Precedence: bulk
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+X-Mailing-List: [email protected]
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+List-Id: <linux-wireless.vger.kernel.org>
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+ 5mXC8px3ZuLCTI1J/XTfUqQSebgAAAA==
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+X-Change-ID: 20250310-limit-wmi-chanlist-17cb8d27cba6
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+To: [email protected]
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+Cc: Johannes Berg <[email protected]>,
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+ Jeff Johnson <[email protected]>, [email protected],
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+ [email protected], Mantas Pucka <[email protected]>
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+X-Mailer: b4 0.14.2
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+
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+When using BDF with both 5GHz and 6GHz bands enabled on QCN9274, interface
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+fails to start. It happens because FW fails to process
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+WMI_SCAN_CHAN_LIST_CMDID with argument size >2048, resulting in a command
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+timeout. The current code allows splitting channel list across multiple WMI
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+commands but uses WMI max_msg_len (4096) as chunk size, which is still too
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+large.
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+
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+Fix this by limiting the number of channels sent at once, using the value
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+specified in WMI interface description [1].
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+
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+[1] https://git.codelinaro.org/clo/qsdk/platform/vendor/qcom-opensource/wlan/fw-api/-/blob/NHSS.QSDK.13.0.0.6/fw/wmi_unified.h#L6459
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+
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+Tested-on: QCN9274 hw2.0 PCI WLAN.WBE.1.4.1-00199-QCAHKSWPL_SILICONZ-1
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+
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+Signed-off-by: Mantas Pucka <[email protected]>
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+---
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+ drivers/net/wireless/ath/ath12k/wmi.c | 3 +++
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+ drivers/net/wireless/ath/ath12k/wmi.h | 2 ++
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+ 2 files changed, 5 insertions(+)
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+
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+
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+---
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+base-commit: 42aa76e608ca845c98e79f9e23af0bdb07b2eb1d
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+change-id: 20250310-limit-wmi-chanlist-17cb8d27cba6
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+
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+Best regards,
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+
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+--- a/drivers/net/wireless/ath/ath12k/wmi.c
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++++ b/drivers/net/wireless/ath/ath12k/wmi.c
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+@@ -2558,6 +2558,9 @@ int ath12k_wmi_send_scan_chan_list_cmd(s
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+ max_chan_limit = (wmi->wmi_ab->max_msg_len[ar->pdev_idx] - len) /
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+ sizeof(*chan_info);
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+
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++ if (max_chan_limit > WMI_MAX_NUM_CHAN_PER_WMI_CMD)
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++ max_chan_limit = WMI_MAX_NUM_CHAN_PER_WMI_CMD;
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++
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+ num_send_chans = min(arg->nallchans, max_chan_limit);
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+
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+ arg->nallchans -= num_send_chans;
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+--- a/drivers/net/wireless/ath/ath12k/wmi.h
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++++ b/drivers/net/wireless/ath/ath12k/wmi.h
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+@@ -3743,6 +3743,8 @@ struct wmi_stop_scan_cmd {
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+ __le32 pdev_id;
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+ } __packed;
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+
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++#define WMI_MAX_NUM_CHAN_PER_WMI_CMD 58
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++
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+ struct ath12k_wmi_scan_chan_list_arg {
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+ u32 pdev_id;
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+ u16 nallchans;
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Mantas Pucka