On Thu, 5 May 2022, Ricardo Martinez wrote: > From: Haijun Liu <haijun.liu@xxxxxxxxxxxx> > > Data Path Modem AP Interface (DPMAIF) HIF layer provides methods > for initialization, ISR, control and event handling of TX/RX flows. > > DPMAIF TX > Exposes the 'dmpaif_tx_send_skb' function which can be used by the > network device to transmit packets. > The uplink data management uses a Descriptor Ring Buffer (DRB). > First DRB entry is a message type that will be followed by 1 or more > normal DRB entries. Message type DRB will hold the skb information > and each normal DRB entry holds a pointer to the skb payload. > > DPMAIF RX > The downlink buffer management uses Buffer Address Table (BAT) and > Packet Information Table (PIT) rings. > The BAT ring holds the address of skb data buffer for the HW to use, > while the PIT contains metadata about a whole network packet including > a reference to the BAT entry holding the data buffer address. > The driver reads the PIT and BAT entries written by the modem, when > reaching a threshold, the driver will reload the PIT and BAT rings. > > Signed-off-by: Haijun Liu <haijun.liu@xxxxxxxxxxxx> > Signed-off-by: Chandrashekar Devegowda <chandrashekar.devegowda@xxxxxxxxx> > Co-developed-by: Ricardo Martinez <ricardo.martinez@xxxxxxxxxxxxxxx> > Signed-off-by: Ricardo Martinez <ricardo.martinez@xxxxxxxxxxxxxxx> > Reviewed-by: Loic Poulain <loic.poulain@xxxxxxxxxx> > Reviewed-by: Sergey Ryazanov <ryazanov.s.a@xxxxxxxxx> Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@xxxxxxxxxxxxxxx> -- i.
