sfc: Document current usage of efx_rx_buffer::len and efx_nic::rx_buffer_len

Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>

diff --git a/drivers/net/ethernet/sfc/net_driver.h b/drivers/net/ethernet/sfc/net_driver.h
index 9e900817d2ab2e8cde212a760a61b9d64fc64d53..f74411fc000c51187bd81b68e77dca5217532b0c 100644 (file)
--- a/drivers/net/ethernet/sfc/net_driver.h
+++ b/drivers/net/ethernet/sfc/net_driver.h
@@ -209,7 +209,8 @@ struct efx_tx_queue {
  * @page: The associated page buffer.
  *     Will be %NULL if the buffer slot is currently free.
  * @page_offset: Offset within page
- * @len: Buffer length, in bytes.
+ * @len: If pending: length for DMA descriptor.
+ *     If completed: received length, excluding hash prefix.
  * @flags: Flags for buffer and packet state.
  */
 struct efx_rx_buffer {
@@ -668,7 +669,8 @@ struct vfdi_status;
  * @n_channels: Number of channels in use
  * @n_rx_channels: Number of channels used for RX (= number of RX queues)
  * @n_tx_channels: Number of channels used for TX
- * @rx_buffer_len: RX buffer length
+ * @rx_buffer_len: RX buffer length, including start alignment but excluding
+ *     any metadata
  * @rx_buffer_order: Order (log2) of number of pages for each RX buffer
  * @rx_hash_key: Toeplitz hash key for RSS
  * @rx_indir_table: Indirection table for RSS