net: bcmgenet: rework Rx queue init
In preparation for supporting multiple Rx queues: 1. Move the initialization of priv->num_rx_bds, priv->rx_bds, and priv->rx_cbs from bcmgenet_init_rx_ring() to bcmgenet_init_dma() since they are not specific to a single Rx queue. Mimics the Tx init model where priv->num_tx_bds, priv->tx_bds, and priv->tx_cbs are initialized in bcmgenet_init_dma(). 2. Program DMA_MBUF_DONE_THRESH = 1 so that future Rx queues Q0-Q15 will get per-packet Rx interrupt. 3. Group DMA_START_ADDR, RDMA_READ_PTR, RDMA_WRITE_PTR, and DMA_END_ADDR initialization together. Mimics the Tx init model. 4. There is 1-to-1 mapping between RxCBs and RxBDs. Precalculate RxCB->bd_addr so that it can be used in the future. Signed-off-by: NPetri Gynther <pgynther@google.com> Reviewed-by: NFlorian Fainelli <f.fainelli@gmail.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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