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spdm_transport: generic: refactor IO buffers
This allows us to remove alot of repeated code for buffer `set/get`. This approach uses a heap allocated vector and just passes a reference to `libspdm` when required. The associated memory shall be explicitly freed by taking ownership when the buffers are no longer required. Which can be done by calling `libspdm_drop_io_buffers()`. Signed-off-by: Wilfred Mallawa <[email protected]>
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Original file line number | Diff line number | Diff line change |
---|---|---|
@@ -0,0 +1,125 @@ | ||
use once_cell::sync::OnceCell; | ||
use std::ffi::c_void; | ||
|
||
static mut SEND_BUFFER: OnceCell<Vec<u8>> = OnceCell::new(); | ||
static mut RECEIVE_BUFFER: OnceCell<Vec<u8>> = OnceCell::new(); | ||
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||
pub fn libspdm_setup_io_buffers( | ||
context: *mut c_void, | ||
send_recv_len: usize, | ||
libsdpm_buff_len: usize, | ||
) -> Result<(), ()> { | ||
let result = std::panic::catch_unwind(|| { | ||
let buffer_send = vec![0; send_recv_len]; | ||
let buffer_receive = vec![0; send_recv_len]; | ||
(buffer_send, buffer_receive) | ||
}); | ||
|
||
match result { | ||
Ok(buffers) => { | ||
unsafe { | ||
SEND_BUFFER.set(buffers.0).map_err(|_| { | ||
error!("Failed to set send buffer"); | ||
() | ||
})?; | ||
RECEIVE_BUFFER.set(buffers.1).map_err(|_| { | ||
error!("Failed to set receive buffer"); | ||
() | ||
})?; | ||
} | ||
|
||
unsafe { | ||
libspdm::libspdm_rs::libspdm_register_device_buffer_func( | ||
context, | ||
libsdpm_buff_len as u32, | ||
libsdpm_buff_len as u32, | ||
Some(acquire_sender_buffer), | ||
Some(release_sender_buffer), | ||
Some(acquire_receiver_buffer), | ||
Some(release_receiver_buffer), | ||
) | ||
} | ||
Ok(()) | ||
} | ||
Err(_) => { | ||
error!("Failed to allocate transport buffers"); | ||
Err(()) | ||
} | ||
} | ||
} | ||
|
||
/// # Summary | ||
/// | ||
/// A helper function to capture the SEND_BUFFER into `msg_buf_ptr` | ||
/// | ||
/// # Parameter | ||
/// | ||
/// * `_context`: The SPDM context | ||
/// * `max_msg_size`: Returns the length of the sender buffer | ||
/// * `msg_buf_ptr`: Returns a pointer to the sender buffer (mutable) | ||
/// | ||
/// # Returns | ||
/// | ||
/// (0) on success | ||
#[no_mangle] | ||
pub unsafe extern "C" fn acquire_sender_buffer( | ||
_context: *mut c_void, | ||
msg_buf_ptr: *mut *mut c_void, | ||
) -> u32 { | ||
if let Some(buffer) = SEND_BUFFER.get() { | ||
let buf_ptr = buffer.as_ptr() as *mut c_void; | ||
*msg_buf_ptr = buf_ptr; | ||
return 0; | ||
} | ||
error!("Sender buffer is lost or not initialized"); | ||
return 1; | ||
} | ||
|
||
/// # Summary | ||
/// | ||
/// A helper function to capture the RECEIVE_BUFFER into `msg_buf_ptr` | ||
/// | ||
/// # Parameter | ||
/// | ||
/// * `_context`: The SPDM context | ||
/// * `max_msg_size`: Returns the length of the receiver buffer | ||
/// * `msg_buf_ptr`: Returns a pointer to the receiver buffer (mutable) | ||
/// | ||
/// # Returns | ||
/// | ||
/// (0) on success | ||
#[no_mangle] | ||
pub unsafe extern "C" fn acquire_receiver_buffer( | ||
_context: *mut c_void, | ||
msg_buf_ptr: *mut *mut c_void, | ||
) -> u32 { | ||
if let Some(buffer) = RECEIVE_BUFFER.get() { | ||
let buf_ptr = buffer.as_ptr() as *mut c_void; | ||
*msg_buf_ptr = buf_ptr; | ||
return 0; | ||
} | ||
error!("Receiver buffer is lost or not initialized"); | ||
return 1; | ||
} | ||
|
||
/// We are only passing a reference to heap allocated memory, no-op required | ||
#[no_mangle] | ||
pub unsafe extern "C" fn release_receiver_buffer( | ||
_context: *mut c_void, | ||
_msg_buf_ptr: *const c_void, | ||
) { | ||
} | ||
|
||
/// We are only passing a reference to heap allocated memory, no-op required | ||
#[no_mangle] | ||
pub unsafe extern "C" fn release_sender_buffer(_context: *mut c_void, _msg_buf_ptr: *const c_void) { | ||
} | ||
|
||
/// # Summary | ||
/// | ||
/// Take ownership of the IO buffer and drop them out of context allowing the | ||
/// underlying memory to be freed. | ||
pub unsafe fn libspdm_drop_io_buffers() { | ||
if let Some(_) = SEND_BUFFER.take() {} | ||
if let Some(_) = RECEIVE_BUFFER.take() {} | ||
} |
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