nRF7002 Linux driver with softap support

Question

I'm developing a linux device driver for nrf7002 and adding softap support. From the Nordic Playground driver it looks like there is no current support, but a lot of the cfg80211 api functions are set up to support it. I'm adding in the nrf70 api functions to start the ap, change the beacon, etc. but I'm having issues authenticating. I'm very confident that the issue is what I'm sending the nrf70, but I'm not sure what a valid configuration/steps are. 
 From looking through zephyr, it seems I need to init the ap, register mgmt frames, then start the ap. I've tried this, and while the AP does appear, when I try authenticating (as open authentication) it attempts to authenticate but never succeeds. Debug messages indicate that when I'm attempting to authenticate nothing is happening outside of beacon broadcasts. The broadcasts are occurring every 100ms, which I'm not sure if that would cause issues or not. 
 Again, not sure what I'm failing to send down to the nrf7002, but it seems to be ignoring authentication. Any guidance on what I might be missing is appreciated.

esmart-engineering · Accepted Answer

Thanks for looking into it but I've figured out the issue. 
 The issue may only affect the version of linux I'm working on (5.13), but the root cause was the frame types were not being setup correctly. Instead of updating each new frame type, it was skipping the majority of them due to an incorrect match condition. This was due to a misunderstanding that `struct mgmt_frame_regs.interface_stypes` were frame types, but they were actually flags. 
 The following is the updated function (excuse the excessive debug): 
 void nrf_wifi_cfg80211_mgmt_frame_reg(struct wiphy *wiphy,
 struct wireless_dev *wdev,
 struct mgmt_frame_regs *upd)
{
	struct nrf_wifi_ctx_lnx *rpu_ctx_lnx = NULL;
	struct nrf_wifi_fmac_vif_ctx_lnx *vif_ctx_lnx = NULL;
	struct nrf_wifi_umac_mgmt_frame_info *frame_info = NULL;
	struct nrf_wifi_cfg80211_mgmt_registration *reg = NULL;
	bool frame_type_match = false;
	static u16 last_upd = 0;
	int status = -1;

	pr_info("%s: Updating frame reg=%04x global=%04x
", __func__, upd->interface_stypes, upd->global_stypes);

	vif_ctx_lnx = netdev_priv(wdev->netdev);
	rpu_ctx_lnx = vif_ctx_lnx->rpu_ctx;

	frame_info = kzalloc(sizeof(*frame_info), GFP_KERNEL);

	if (!frame_info) {
 pr_err("%s: Unable to allocate memory
", __func__);
 goto out;
	}

	if (last_upd == upd->interface_stypes) {
 pr_err("%s: no update
", __func__);
 goto out;
	}
	list_for_each_entry(reg, &wdev->mgmt_registrations, list) {
 pr_info("%s: reg type=%04x", __func__, le16_to_cpu(reg->frame_type));
 if ((last_upd ^ upd->interface_stypes) != BIT(le16_to_cpu(reg->frame_type) >> 4))
 continue;
 frame_type_match = true;

 break;
	}

	if (!frame_type_match ) {
 pr_err("%s: frametype not match %04x", __func__, le16_to_cpu(reg->frame_type));
 goto out;
	}
	frame_info->frame_type = le16_to_cpu(reg->frame_type);
	pr_info("%s: frametype=%04x len=%d", __func__, frame_info->frame_type, reg->match_len);
	frame_info->frame_match.frame_match_len = reg->match_len;
	if (reg->match_len >= NRF_WIFI_FRAME_MATCH_MAX_LEN) {
 pr_err("%s: match_len too big: %d (max %d)", __func__, reg->match_len, NRF_WIFI_FRAME_MATCH_MAX_LEN);
 goto out;
	}
	memcpy(frame_info->frame_match.frame_match, reg->match, reg->match_len);

	status = nrf_wifi_fmac_mgmt_frame_reg(rpu_ctx_lnx->rpu_ctx,
 vif_ctx_lnx->if_idx,
 frame_info);
	if (status != NRF_WIFI_STATUS_SUCCESS) {
 pr_err("%s: nrf_wifi_fmac_mgmt_frame_reg failed", __func__);
 goto out;
	}

out:
	if (frame_info)
 kfree(frame_info);
	last_upd = upd->interface_stypes;

	return;
} 
 For some reason type 0xd0 was able to go through correctly, which is why authentication worked, but any other frame type (0x0000 is association request) would fail. The updated function allows open authentication to work successfully, while more work is needed to add security.

nRF7002 Linux driver with softap support

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