The Rx ring can either be made up of normal or extended descriptors, not
a mix of the two at the same time. Make this explicitly by grouping the
two variables in a rx_ring union.
The extension of the storage for more than one queue of normal
descriptors from a single to NUM_RX_QUEUE queues have no practical
effect. But aids in making the code readable as the code that uses it
already piggyback on other members of struct ravb_private that are
arrays of max length NUM_RX_QUEUE, e.g. rx_desc_dma. This will also make
further refactoring easier.
While at it rename the normal descriptor Rx ring to make it clear it's
not strictly related to the GbEthernet E-MAC IP found in RZ/G2L, normal
descriptors could be used on R-Car SoCs too.
Signed-off-by: Niklas Söderlund <niklas.soderlund+renesas@xxxxxxxxxxxx>
Reviewed-by: Paul Barker <paul.barker.ct@xxxxxxxxxxxxxx>
---
drivers/net/ethernet/renesas/ravb.h | 6 ++-
drivers/net/ethernet/renesas/ravb_main.c | 57 ++++++++++++------------
2 files changed, 33 insertions(+), 30 deletions(-)
diff --git a/drivers/net/ethernet/renesas/ravb.h b/drivers/net/ethernet/renesas/ravb.h
index 35e642fc4b2a..aecc98282c7e 100644
--- a/drivers/net/ethernet/renesas/ravb.h
+++ b/drivers/net/ethernet/renesas/ravb.h
@@ -1092,8 +1092,10 @@ struct ravb_private {
struct ravb_desc *desc_bat;
dma_addr_t rx_desc_dma[NUM_RX_QUEUE];
dma_addr_t tx_desc_dma[NUM_TX_QUEUE];
- struct ravb_rx_desc *gbeth_rx_ring;
- struct ravb_ex_rx_desc *rx_ring[NUM_RX_QUEUE];
+ union {
+ struct ravb_rx_desc *desc;
+ struct ravb_ex_rx_desc *ex_desc;
+ } rx_ring[NUM_RX_QUEUE];
struct ravb_tx_desc *tx_ring[NUM_TX_QUEUE];
void *tx_align[NUM_TX_QUEUE];
struct sk_buff *rx_1st_skb;
diff --git a/drivers/net/ethernet/renesas/ravb_main.c b/drivers/net/ethernet/renesas/ravb_main.c
index f9fb772b05c7..c25a80f4d3b9 100644
--- a/drivers/net/ethernet/renesas/ravb_main.c
+++ b/drivers/net/ethernet/renesas/ravb_main.c
@@ -241,11 +241,11 @@ static void ravb_rx_ring_free_gbeth(struct net_device *ndev, int q)
unsigned int ring_size;
unsigned int i;
- if (!priv->gbeth_rx_ring)
+ if (!priv->rx_ring[q].desc)
return;
for (i = 0; i < priv->num_rx_ring[q]; i++) {
- struct ravb_rx_desc *desc = &priv->gbeth_rx_ring[i];
+ struct ravb_rx_desc *desc = &priv->rx_ring[q].desc[i];
if (!dma_mapping_error(ndev->dev.parent,
le32_to_cpu(desc->dptr)))
@@ -255,9 +255,9 @@ static void ravb_rx_ring_free_gbeth(struct net_device *ndev, int q)
DMA_FROM_DEVICE);
}
ring_size = sizeof(struct ravb_rx_desc) * (priv->num_rx_ring[q] + 1);
- dma_free_coherent(ndev->dev.parent, ring_size, priv->gbeth_rx_ring,
+ dma_free_coherent(ndev->dev.parent, ring_size, priv->rx_ring[q].desc,
priv->rx_desc_dma[q]);
- priv->gbeth_rx_ring = NULL;
+ priv->rx_ring[q].desc = NULL;
}
static void ravb_rx_ring_free_rcar(struct net_device *ndev, int q)
@@ -266,11 +266,11 @@ static void ravb_rx_ring_free_rcar(struct net_device *ndev, int q)
unsigned int ring_size;
unsigned int i;
- if (!priv->rx_ring[q])
+ if (!priv->rx_ring[q].ex_desc)
return;
for (i = 0; i < priv->num_rx_ring[q]; i++) {
- struct ravb_ex_rx_desc *desc = &priv->rx_ring[q][i];
+ struct ravb_ex_rx_desc *desc = &priv->rx_ring[q].ex_desc[i];
if (!dma_mapping_error(ndev->dev.parent,
le32_to_cpu(desc->dptr)))
@@ -281,9 +281,9 @@ static void ravb_rx_ring_free_rcar(struct net_device *ndev, int q)
}
ring_size = sizeof(struct ravb_ex_rx_desc) *
(priv->num_rx_ring[q] + 1);
- dma_free_coherent(ndev->dev.parent, ring_size, priv->rx_ring[q],
+ dma_free_coherent(ndev->dev.parent, ring_size, priv->rx_ring[q].ex_desc,
priv->rx_desc_dma[q]);
- priv->rx_ring[q] = NULL;
+ priv->rx_ring[q].ex_desc = NULL;
}
/* Free skb's and DMA buffers for Ethernet AVB */
@@ -335,11 +335,11 @@ static void ravb_rx_ring_format_gbeth(struct net_device *ndev, int q)
unsigned int i;
rx_ring_size = sizeof(*rx_desc) * priv->num_rx_ring[q];
- memset(priv->gbeth_rx_ring, 0, rx_ring_size);
+ memset(priv->rx_ring[q].desc, 0, rx_ring_size);
/* Build RX ring buffer */
for (i = 0; i < priv->num_rx_ring[q]; i++) {
/* RX descriptor */
- rx_desc = &priv->gbeth_rx_ring[i];
+ rx_desc = &priv->rx_ring[q].desc[i];
rx_desc->ds_cc = cpu_to_le16(GBETH_RX_DESC_DATA_SIZE);
dma_addr = dma_map_single(ndev->dev.parent, priv->rx_skb[q][i]->data,
GBETH_RX_BUFF_MAX,
@@ -352,7 +352,7 @@ static void ravb_rx_ring_format_gbeth(struct net_device *ndev, int q)
rx_desc->dptr = cpu_to_le32(dma_addr);
rx_desc->die_dt = DT_FEMPTY;
}
- rx_desc = &priv->gbeth_rx_ring[i];
+ rx_desc = &priv->rx_ring[q].desc[i];
rx_desc->dptr = cpu_to_le32((u32)priv->rx_desc_dma[q]);
rx_desc->die_dt = DT_LINKFIX; /* type */
}
@@ -365,11 +365,11 @@ static void ravb_rx_ring_format_rcar(struct net_device *ndev, int q)
dma_addr_t dma_addr;
unsigned int i;
- memset(priv->rx_ring[q], 0, rx_ring_size);
+ memset(priv->rx_ring[q].ex_desc, 0, rx_ring_size);
/* Build RX ring buffer */
for (i = 0; i < priv->num_rx_ring[q]; i++) {
/* RX descriptor */
- rx_desc = &priv->rx_ring[q][i];
+ rx_desc = &priv->rx_ring[q].ex_desc[i];
rx_desc->ds_cc = cpu_to_le16(RX_BUF_SZ);
dma_addr = dma_map_single(ndev->dev.parent, priv->rx_skb[q][i]->data,
RX_BUF_SZ,
@@ -382,7 +382,7 @@ static void ravb_rx_ring_format_rcar(struct net_device *ndev, int q)
rx_desc->dptr = cpu_to_le32(dma_addr);
rx_desc->die_dt = DT_FEMPTY;
}
- rx_desc = &priv->rx_ring[q][i];
+ rx_desc = &priv->rx_ring[q].ex_desc[i];
rx_desc->dptr = cpu_to_le32((u32)priv->rx_desc_dma[q]);
rx_desc->die_dt = DT_LINKFIX; /* type */
}
@@ -437,10 +437,10 @@ static void *ravb_alloc_rx_desc_gbeth(struct net_device *ndev, int q)
ring_size = sizeof(struct ravb_rx_desc) * (priv->num_rx_ring[q] + 1);
- priv->gbeth_rx_ring = dma_alloc_coherent(ndev->dev.parent, ring_size,
- &priv->rx_desc_dma[q],
- GFP_KERNEL);
- return priv->gbeth_rx_ring;
+ priv->rx_ring[q].desc = dma_alloc_coherent(ndev->dev.parent, ring_size,
+ &priv->rx_desc_dma[q],
+ GFP_KERNEL);
+ return priv->rx_ring[q].desc;
}
static void *ravb_alloc_rx_desc_rcar(struct net_device *ndev, int q)
@@ -450,10 +450,11 @@ static void *ravb_alloc_rx_desc_rcar(struct net_device *ndev, int q)
ring_size = sizeof(struct ravb_ex_rx_desc) * (priv->num_rx_ring[q] + 1);
- priv->rx_ring[q] = dma_alloc_coherent(ndev->dev.parent, ring_size,
- &priv->rx_desc_dma[q],
- GFP_KERNEL);
- return priv->rx_ring[q];
+ priv->rx_ring[q].ex_desc = dma_alloc_coherent(ndev->dev.parent,
+ ring_size,
+ &priv->rx_desc_dma[q],
+ GFP_KERNEL);
+ return priv->rx_ring[q].ex_desc;
}
/* Init skb and descriptor buffer for Ethernet AVB */
@@ -830,7 +831,7 @@ static bool ravb_rx_gbeth(struct net_device *ndev, int *quota, int q)
limit = priv->dirty_rx[q] + priv->num_rx_ring[q] - priv->cur_rx[q];
stats = &priv->stats[q];
- desc = &priv->gbeth_rx_ring[entry];
+ desc = &priv->rx_ring[q].desc[entry];
for (i = 0; i < limit && rx_packets < *quota && desc->die_dt != DT_FEMPTY; i++) {
/* Descriptor type must be checked before all other reads */
dma_rmb();
@@ -901,13 +902,13 @@ static bool ravb_rx_gbeth(struct net_device *ndev, int *quota, int q)
}
entry = (++priv->cur_rx[q]) % priv->num_rx_ring[q];
- desc = &priv->gbeth_rx_ring[entry];
+ desc = &priv->rx_ring[q].desc[entry];
}
/* Refill the RX ring buffers. */
for (; priv->cur_rx[q] - priv->dirty_rx[q] > 0; priv->dirty_rx[q]++) {
entry = priv->dirty_rx[q] % priv->num_rx_ring[q];
- desc = &priv->gbeth_rx_ring[entry];
+ desc = &priv->rx_ring[q].desc[entry];
desc->ds_cc = cpu_to_le16(GBETH_RX_DESC_DATA_SIZE);
if (!priv->rx_skb[q][entry]) {
@@ -957,7 +958,7 @@ static bool ravb_rx_rcar(struct net_device *ndev, int *quota, int q)
boguscnt = min(boguscnt, *quota);
limit = boguscnt;
- desc = &priv->rx_ring[q][entry];
+ desc = &priv->rx_ring[q].ex_desc[entry];
while (desc->die_dt != DT_FEMPTY) {
/* Descriptor type must be checked before all other reads */
dma_rmb();
@@ -1017,13 +1018,13 @@ static bool ravb_rx_rcar(struct net_device *ndev, int *quota, int q)
}
entry = (++priv->cur_rx[q]) % priv->num_rx_ring[q];
- desc = &priv->rx_ring[q][entry];
+ desc = &priv->rx_ring[q].ex_desc[entry];
}
/* Refill the RX ring buffers. */
for (; priv->cur_rx[q] - priv->dirty_rx[q] > 0; priv->dirty_rx[q]++) {
entry = priv->dirty_rx[q] % priv->num_rx_ring[q];
- desc = &priv->rx_ring[q][entry];
+ desc = &priv->rx_ring[q].ex_desc[entry];
desc->ds_cc = cpu_to_le16(RX_BUF_SZ);
if (!priv->rx_skb[q][entry]) {
--
2.43.2
