}
dma_unmap_addr_set(cb, dma_addr, mapping);
- /* assign packet, prepare descriptor, and advance pointer */
-
- dmadesc_set_addr(priv, priv->rx_bd_assign_ptr, mapping);
-
- /* turn on the newly assigned BD for DMA to use */
- priv->rx_bd_assign_index++;
- priv->rx_bd_assign_index &= (priv->num_rx_bds - 1);
-
- priv->rx_bd_assign_ptr = priv->rx_bds +
- (priv->rx_bd_assign_index * DMA_DESC_SIZE);
+ dmadesc_set_addr(priv, cb->bd_addr, mapping);
return 0;
}
* this could be called from bottom half, or from NAPI polling method.
*/
static unsigned int bcmgenet_desc_rx(struct bcmgenet_priv *priv,
+ unsigned int index,
unsigned int budget)
{
+ struct bcmgenet_rx_ring *ring = &priv->rx_rings[index];
struct net_device *dev = priv->dev;
struct enet_cb *cb;
struct sk_buff *skb;
unsigned int p_index;
unsigned int chksum_ok = 0;
- p_index = bcmgenet_rdma_ring_readl(priv, DESC_INDEX, RDMA_PROD_INDEX);
+ p_index = bcmgenet_rdma_ring_readl(priv, index, RDMA_PROD_INDEX);
p_index &= DMA_P_INDEX_MASK;
- if (p_index < priv->rx_c_index)
- rxpkttoprocess = (DMA_C_INDEX_MASK + 1) -
- priv->rx_c_index + p_index;
+ if (likely(p_index >= ring->c_index))
+ rxpkttoprocess = p_index - ring->c_index;
else
- rxpkttoprocess = p_index - priv->rx_c_index;
+ rxpkttoprocess = (DMA_C_INDEX_MASK + 1) - ring->c_index +
+ p_index;
netif_dbg(priv, rx_status, dev,
"RDMA: rxpkttoprocess=%d\n", rxpkttoprocess);
while ((rxpktprocessed < rxpkttoprocess) &&
(rxpktprocessed < budget)) {
- cb = &priv->rx_cbs[priv->rx_read_ptr];
+ cb = &priv->rx_cbs[ring->read_ptr];
skb = cb->skb;
/* We do not have a backing SKB, so we do not have a
if (!priv->desc_64b_en) {
dma_length_status =
- dmadesc_get_length_status(priv,
- priv->rx_bds +
- (priv->rx_read_ptr *
- DMA_DESC_SIZE));
+ dmadesc_get_length_status(priv, cb->bd_addr);
} else {
struct status_64 *status;
netif_dbg(priv, rx_status, dev,
"%s:p_ind=%d c_ind=%d read_ptr=%d len_stat=0x%08x\n",
- __func__, p_index, priv->rx_c_index,
- priv->rx_read_ptr, dma_length_status);
+ __func__, p_index, ring->c_index,
+ ring->read_ptr, dma_length_status);
if (unlikely(!(dma_flag & DMA_EOP) || !(dma_flag & DMA_SOP))) {
netif_err(priv, rx_status, dev,
}
rxpktprocessed++;
- priv->rx_read_ptr++;
- priv->rx_read_ptr &= (priv->num_rx_bds - 1);
+ if (likely(ring->read_ptr < ring->end_ptr))
+ ring->read_ptr++;
+ else
+ ring->read_ptr = ring->cb_ptr;
+
+ ring->c_index = (ring->c_index + 1) & DMA_C_INDEX_MASK;
+ bcmgenet_rdma_ring_writel(priv, index, ring->c_index, RDMA_CONS_INDEX);
}
return rxpktprocessed;
}
/* Assign skb to RX DMA descriptor. */
-static int bcmgenet_alloc_rx_buffers(struct bcmgenet_priv *priv)
+static int bcmgenet_alloc_rx_buffers(struct bcmgenet_priv *priv,
+ struct bcmgenet_rx_ring *ring)
{
struct enet_cb *cb;
int ret = 0;
int i;
- netif_dbg(priv, hw, priv->dev, "%s:\n", __func__);
+ netif_dbg(priv, hw, priv->dev, "%s\n", __func__);
/* loop here for each buffer needing assign */
- for (i = 0; i < priv->num_rx_bds; i++) {
- cb = &priv->rx_cbs[priv->rx_bd_assign_index];
+ for (i = 0; i < ring->size; i++) {
+ cb = ring->cbs + i;
if (cb->skb)
continue;
/* Initialize a RDMA ring */
static int bcmgenet_init_rx_ring(struct bcmgenet_priv *priv,
- unsigned int index, unsigned int size)
+ unsigned int index, unsigned int size,
+ unsigned int start_ptr, unsigned int end_ptr)
{
+ struct bcmgenet_rx_ring *ring = &priv->rx_rings[index];
u32 words_per_bd = WORDS_PER_BD(priv);
int ret;
- priv->rx_bd_assign_ptr = priv->rx_bds;
- priv->rx_bd_assign_index = 0;
- priv->rx_c_index = 0;
- priv->rx_read_ptr = 0;
+ ring->index = index;
+ ring->cbs = priv->rx_cbs + start_ptr;
+ ring->size = size;
+ ring->c_index = 0;
+ ring->read_ptr = start_ptr;
+ ring->cb_ptr = start_ptr;
+ ring->end_ptr = end_ptr - 1;
- ret = bcmgenet_alloc_rx_buffers(priv);
- if (ret) {
+ ret = bcmgenet_alloc_rx_buffers(priv, ring);
+ if (ret)
return ret;
- }
bcmgenet_rdma_ring_writel(priv, index, 0, RDMA_PROD_INDEX);
bcmgenet_rdma_ring_writel(priv, index, 0, RDMA_CONS_INDEX);
DMA_FC_THRESH_HI, RDMA_XON_XOFF_THRESH);
/* Set start and end address, read and write pointers */
- bcmgenet_rdma_ring_writel(priv, index, 0, DMA_START_ADDR);
- bcmgenet_rdma_ring_writel(priv, index, 0, RDMA_READ_PTR);
- bcmgenet_rdma_ring_writel(priv, index, 0, RDMA_WRITE_PTR);
- bcmgenet_rdma_ring_writel(priv, index, words_per_bd * size - 1,
+ bcmgenet_rdma_ring_writel(priv, index, start_ptr * words_per_bd,
+ DMA_START_ADDR);
+ bcmgenet_rdma_ring_writel(priv, index, start_ptr * words_per_bd,
+ RDMA_READ_PTR);
+ bcmgenet_rdma_ring_writel(priv, index, start_ptr * words_per_bd,
+ RDMA_WRITE_PTR);
+ bcmgenet_rdma_ring_writel(priv, index, end_ptr * words_per_bd - 1,
DMA_END_ADDR);
return ret;
bcmgenet_tdma_writel(priv, dma_ctrl, DMA_CTRL);
}
+/* Initialize Rx queues
+ *
+ * Queues 0-15 are priority queues. Hardware Filtering Block (HFB) can be
+ * used to direct traffic to these queues.
+ *
+ * Queue 16 is the default Rx queue with GENET_Q16_RX_BD_CNT descriptors.
+ */
+static int bcmgenet_init_rx_queues(struct net_device *dev)
+{
+ struct bcmgenet_priv *priv = netdev_priv(dev);
+ u32 i;
+ u32 dma_enable;
+ u32 dma_ctrl;
+ u32 ring_cfg;
+ int ret;
+
+ dma_ctrl = bcmgenet_rdma_readl(priv, DMA_CTRL);
+ dma_enable = dma_ctrl & DMA_EN;
+ dma_ctrl &= ~DMA_EN;
+ bcmgenet_rdma_writel(priv, dma_ctrl, DMA_CTRL);
+
+ dma_ctrl = 0;
+ ring_cfg = 0;
+
+ /* Initialize Rx priority queues */
+ for (i = 0; i < priv->hw_params->rx_queues; i++) {
+ ret = bcmgenet_init_rx_ring(priv, i,
+ priv->hw_params->rx_bds_per_q,
+ i * priv->hw_params->rx_bds_per_q,
+ (i + 1) *
+ priv->hw_params->rx_bds_per_q);
+ if (ret)
+ return ret;
+
+ ring_cfg |= (1 << i);
+ dma_ctrl |= (1 << (i + DMA_RING_BUF_EN_SHIFT));
+ }
+
+ /* Initialize Rx default queue 16 */
+ ret = bcmgenet_init_rx_ring(priv, DESC_INDEX, GENET_Q16_RX_BD_CNT,
+ priv->hw_params->rx_queues *
+ priv->hw_params->rx_bds_per_q,
+ TOTAL_DESC);
+ if (ret)
+ return ret;
+
+ ring_cfg |= (1 << DESC_INDEX);
+ dma_ctrl |= (1 << (DESC_INDEX + DMA_RING_BUF_EN_SHIFT));
+
+ /* Enable rings */
+ bcmgenet_rdma_writel(priv, ring_cfg, DMA_RING_CFG);
+
+ /* Configure ring as descriptor ring and re-enable DMA if enabled */
+ if (dma_enable)
+ dma_ctrl |= DMA_EN;
+ bcmgenet_rdma_writel(priv, dma_ctrl, DMA_CTRL);
+
+ return 0;
+}
+
static int bcmgenet_dma_teardown(struct bcmgenet_priv *priv)
{
int ret = 0;
cb->bd_addr = priv->rx_bds + i * DMA_DESC_SIZE;
}
- /* Initialize Rx default queue 16 */
- ret = bcmgenet_init_rx_ring(priv, DESC_INDEX, TOTAL_DESC);
+ /* Initialize Rx queues */
+ ret = bcmgenet_init_rx_queues(priv->dev);
if (ret) {
- netdev_err(priv->dev, "failed to initialize RX ring\n");
+ netdev_err(priv->dev, "failed to initialize Rx queues\n");
bcmgenet_free_rx_buffers(priv);
kfree(priv->rx_cbs);
return ret;
struct bcmgenet_priv, napi);
unsigned int work_done;
- work_done = bcmgenet_desc_rx(priv, budget);
+ work_done = bcmgenet_desc_rx(priv, DESC_INDEX, budget);
- /* Advancing our consumer index*/
- priv->rx_c_index += work_done;
- priv->rx_c_index &= DMA_C_INDEX_MASK;
- bcmgenet_rdma_ring_writel(priv, DESC_INDEX,
- priv->rx_c_index, RDMA_CONS_INDEX);
if (work_done < budget) {
napi_complete(napi);
bcmgenet_intrl2_0_writel(priv, UMAC_IRQ_RXDMA_BDONE,
projects / karo-tx-linux.git / blobdiff