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Message-Id: <20150306214500.B542F2214B2@puck.mtv.corp.google.com>
Date: Fri, 6 Mar 2015 13:45:00 -0800 (PST)
From: Petri Gynther <pgynther@...gle.com>
To: netdev@...r.kernel.org
Cc: davem@...emloft.net, f.fainelli@...il.com
Subject: [PATCH net-next] 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: Petri Gynther <pgynther@...gle.com>
---
drivers/net/ethernet/broadcom/genet/bcmgenet.c | 43 ++++++++++++++++----------
1 file changed, 27 insertions(+), 16 deletions(-)
diff --git a/drivers/net/ethernet/broadcom/genet/bcmgenet.c b/drivers/net/ethernet/broadcom/genet/bcmgenet.c
index d90785c..83c0cb3 100644
--- a/drivers/net/ethernet/broadcom/genet/bcmgenet.c
+++ b/drivers/net/ethernet/broadcom/genet/bcmgenet.c
@@ -1783,37 +1783,33 @@ static int bcmgenet_init_rx_ring(struct bcmgenet_priv *priv,
u32 words_per_bd = WORDS_PER_BD(priv);
int ret;
- priv->num_rx_bds = TOTAL_DESC;
- priv->rx_bds = priv->base + priv->hw_params->rdma_offset;
priv->rx_bd_assign_ptr = priv->rx_bds;
priv->rx_bd_assign_index = 0;
priv->rx_c_index = 0;
priv->rx_read_ptr = 0;
- priv->rx_cbs = kcalloc(priv->num_rx_bds, sizeof(struct enet_cb),
- GFP_KERNEL);
- if (!priv->rx_cbs)
- return -ENOMEM;
ret = bcmgenet_alloc_rx_buffers(priv);
if (ret) {
- kfree(priv->rx_cbs);
return ret;
}
- bcmgenet_rdma_ring_writel(priv, index, 0, RDMA_WRITE_PTR);
bcmgenet_rdma_ring_writel(priv, index, 0, RDMA_PROD_INDEX);
bcmgenet_rdma_ring_writel(priv, index, 0, RDMA_CONS_INDEX);
+ bcmgenet_rdma_ring_writel(priv, index, 1, DMA_MBUF_DONE_THRESH);
bcmgenet_rdma_ring_writel(priv, index,
((size << DMA_RING_SIZE_SHIFT) |
RX_BUF_LENGTH), DMA_RING_BUF_SIZE);
- bcmgenet_rdma_ring_writel(priv, index, 0, DMA_START_ADDR);
- bcmgenet_rdma_ring_writel(priv, index,
- words_per_bd * size - 1, DMA_END_ADDR);
bcmgenet_rdma_ring_writel(priv, index,
(DMA_FC_THRESH_LO <<
DMA_XOFF_THRESHOLD_SHIFT) |
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,
+ DMA_END_ADDR);
return ret;
}
@@ -1976,18 +1972,33 @@ static int bcmgenet_init_dma(struct bcmgenet_priv *priv)
unsigned int i;
struct enet_cb *cb;
- netif_dbg(priv, hw, priv->dev, "bcmgenet: init_edma\n");
+ netif_dbg(priv, hw, priv->dev, "%s\n", __func__);
- /* by default, enable ring 16 (descriptor based) */
+ /* Init rDma */
+ bcmgenet_rdma_writel(priv, DMA_MAX_BURST_LENGTH, DMA_SCB_BURST_SIZE);
+
+ /* Initialize common Rx ring structures */
+ priv->rx_bds = priv->base + priv->hw_params->rdma_offset;
+ priv->num_rx_bds = TOTAL_DESC;
+ priv->rx_cbs = kcalloc(priv->num_rx_bds, sizeof(struct enet_cb),
+ GFP_KERNEL);
+ if (!priv->rx_cbs)
+ return -ENOMEM;
+
+ for (i = 0; i < priv->num_rx_bds; i++) {
+ cb = priv->rx_cbs + i;
+ 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);
if (ret) {
netdev_err(priv->dev, "failed to initialize RX ring\n");
+ bcmgenet_free_rx_buffers(priv);
+ kfree(priv->rx_cbs);
return ret;
}
- /* init rDma */
- bcmgenet_rdma_writel(priv, DMA_MAX_BURST_LENGTH, DMA_SCB_BURST_SIZE);
-
/* Init tDma */
bcmgenet_tdma_writel(priv, DMA_MAX_BURST_LENGTH, DMA_SCB_BURST_SIZE);
--
2.2.0.rc0.207.ga3a616c
--
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