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L2CAP functions simplification [WIP] #1849

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@vandy vandy commented Aug 12, 2024

This PR is related to #1846. These were the thoughts during gatt offset research.

One of the concerns is unnecessary (as it seems to me) arguments passed down the line to functions. It confuses a little about real dependencies.

The idea behind joining ble_l2cap_parse_hdr and os_mbuf_adj is to make it similar to ble_hs_hci_util_data_hdr_strip, as ble_l2cap_parse_hdr is not used anywhere outside the function.

The main concern is that ble_l2cap_rx and ble_l2cap_rx_payload besides business logic are messing with mbuf processing and other "infrastructure" stuff. Mixing logic from different layers of abstraction. This functions would be simpler if they just did l2cap processing and returning error codes immediately and the caller made cleaning and processing. So ble_hs_hci_evt_acl_process could clean the buffer as it already does, also schedule a timer on l2cap fragments as it already knows about fragments in the switch block.

@@ -427,7 +429,10 @@
goto err;
}

// REVIEW: It would be nice not to pass conn to decrease number of arguments, timer reschedule could be processed here. Actually it could be hoisted to the caller as it already processes the return value and knows about l2cap fragments existence. So just return ble_l2cap_rx_payload(chan, om, out_rx_cb);

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