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net: ravb: Refactor RX ring refill

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To reduce code duplication, we add a new RX ring refill function which
can handle both the initial RX ring population (which was split between
ravb_ring_init() and ravb_ring_format()) and the RX ring refill after
polling (in ravb_rx()).

Signed-off-by: Paul Barker <paul.barker.ct@bp.renesas.com>
Reviewed-by: Sergey Shtylyov <s.shtylyov@omp.ru>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
This commit is contained in:
Paul Barker
2024-06-04 08:28:21 +01:00
committed by Paolo Abeni
parent b0e0e20dc6
commit 37a01c12e9
1 changed files with 57 additions and 93 deletions
Download Patch File Download Diff File Expand all files Collapse all files
drivers/net/ethernet/renesas/ravb_main.c
+57 -93
View File
@@ -317,35 +317,43 @@ static void ravb_ring_free(struct net_device *ndev, int q)
priv->tx_skb[q] = NULL;
}
static void ravb_rx_ring_format(struct net_device *ndev, int q)
static u32
ravb_rx_ring_refill(struct net_device *ndev, int q, u32 count, gfp_t gfp_mask)
{
struct ravb_private *priv = netdev_priv(ndev);
const struct ravb_hw_info *info = priv->info;
struct ravb_rx_desc *rx_desc;
unsigned int rx_ring_size;
dma_addr_t dma_addr;
unsigned int i;
u32 i, entry;
rx_ring_size = priv->info->rx_desc_size * priv->num_rx_ring[q];
memset(priv->rx_ring[q].raw, 0, rx_ring_size);
/* Build RX ring buffer */
for (i = 0; i < priv->num_rx_ring[q]; i++) {
/* RX descriptor */
rx_desc = ravb_rx_get_desc(priv, q, i);
rx_desc->ds_cc = cpu_to_le16(priv->info->rx_max_desc_use);
dma_addr = dma_map_single(ndev->dev.parent, priv->rx_skb[q][i]->data,
priv->info->rx_max_frame_size,
DMA_FROM_DEVICE);
/* We just set the data size to 0 for a failed mapping which
* should prevent DMA from happening...
*/
if (dma_mapping_error(ndev->dev.parent, dma_addr))
rx_desc->ds_cc = cpu_to_le16(0);
rx_desc->dptr = cpu_to_le32(dma_addr);
for (i = 0; i < count; i++) {
entry = (priv->dirty_rx[q] + i) % priv->num_rx_ring[q];
rx_desc = ravb_rx_get_desc(priv, q, entry);
rx_desc->ds_cc = cpu_to_le16(info->rx_max_desc_use);
if (!priv->rx_skb[q][entry]) {
priv->rx_skb[q][entry] = ravb_alloc_skb(ndev, info,
gfp_mask);
if (!priv->rx_skb[q][entry])
break;
dma_addr = dma_map_single(ndev->dev.parent,
priv->rx_skb[q][entry]->data,
priv->info->rx_max_frame_size,
DMA_FROM_DEVICE);
skb_checksum_none_assert(priv->rx_skb[q][entry]);
/* We just set the data size to 0 for a failed mapping
* which should prevent DMA from happening...
*/
if (dma_mapping_error(ndev->dev.parent, dma_addr))
rx_desc->ds_cc = cpu_to_le16(0);
rx_desc->dptr = cpu_to_le32(dma_addr);
}
/* Descriptor type must be set after all the above writes */
dma_wmb();
rx_desc->die_dt = DT_FEMPTY;
}
rx_desc = ravb_rx_get_desc(priv, q, i);
rx_desc->dptr = cpu_to_le32((u32)priv->rx_desc_dma[q]);
rx_desc->die_dt = DT_LINKFIX; /* type */
return i;
}
/* Format skb and descriptor buffer for Ethernet AVB */
@@ -353,6 +361,7 @@ static void ravb_ring_format(struct net_device *ndev, int q)
{
struct ravb_private *priv = netdev_priv(ndev);
unsigned int num_tx_desc = priv->num_tx_desc;
struct ravb_rx_desc *rx_desc;
struct ravb_tx_desc *tx_desc;
struct ravb_desc *desc;
unsigned int tx_ring_size = sizeof(*tx_desc) * priv->num_tx_ring[q] *
@@ -364,7 +373,13 @@ static void ravb_ring_format(struct net_device *ndev, int q)
priv->dirty_rx[q] = 0;
priv->dirty_tx[q] = 0;
ravb_rx_ring_format(ndev, q);
/* Regular RX descriptors have already been initialized by
* ravb_rx_ring_refill(), we just need to initialize the final link
* descriptor.
*/
rx_desc = ravb_rx_get_desc(priv, q, priv->num_rx_ring[q]);
rx_desc->dptr = cpu_to_le32((u32)priv->rx_desc_dma[q]);
rx_desc->die_dt = DT_LINKFIX; /* type */
memset(priv->tx_ring[q], 0, tx_ring_size);
/* Build TX ring buffer */
@@ -408,11 +423,9 @@ static void *ravb_alloc_rx_desc(struct net_device *ndev, int q)
static int ravb_ring_init(struct net_device *ndev, int q)
{
struct ravb_private *priv = netdev_priv(ndev);
const struct ravb_hw_info *info = priv->info;
unsigned int num_tx_desc = priv->num_tx_desc;
unsigned int ring_size;
struct sk_buff *skb;
unsigned int i;
u32 num_filled;
/* Allocate RX and TX skb rings */
priv->rx_skb[q] = kcalloc(priv->num_rx_ring[q],
@@ -422,12 +435,18 @@ static int ravb_ring_init(struct net_device *ndev, int q)
if (!priv->rx_skb[q] || !priv->tx_skb[q])
goto error;
for (i = 0; i < priv->num_rx_ring[q]; i++) {
skb = ravb_alloc_skb(ndev, info, GFP_KERNEL);
if (!skb)
goto error;
priv->rx_skb[q][i] = skb;
}
/* Allocate all RX descriptors. */
if (!ravb_alloc_rx_desc(ndev, q))
goto error;
/* Populate RX ring buffer. */
priv->dirty_rx[q] = 0;
ring_size = priv->info->rx_desc_size * priv->num_rx_ring[q];
memset(priv->rx_ring[q].raw, 0, ring_size);
num_filled = ravb_rx_ring_refill(ndev, q, priv->num_rx_ring[q],
GFP_KERNEL);
if (num_filled != priv->num_rx_ring[q])
goto error;
if (num_tx_desc > 1) {
/* Allocate rings for the aligned buffers */
@@ -437,12 +456,6 @@ static int ravb_ring_init(struct net_device *ndev, int q)
goto error;
}
/* Allocate all RX descriptors. */
if (!ravb_alloc_rx_desc(ndev, q))
goto error;
priv->dirty_rx[q] = 0;
/* Allocate all TX descriptors. */
ring_size = sizeof(struct ravb_tx_desc) *
(priv->num_tx_ring[q] * num_tx_desc + 1);
@@ -762,11 +775,9 @@ static struct sk_buff *ravb_get_skb_gbeth(struct net_device *ndev, int entry,
static int ravb_rx_gbeth(struct net_device *ndev, int budget, int q)
{
struct ravb_private *priv = netdev_priv(ndev);
const struct ravb_hw_info *info = priv->info;
struct net_device_stats *stats;
struct ravb_rx_desc *desc;
struct sk_buff *skb;
dma_addr_t dma_addr;
int rx_packets = 0;
u8 desc_status;
u16 desc_len;
@@ -854,32 +865,9 @@ static int ravb_rx_gbeth(struct net_device *ndev, int budget, int q)
}
/* 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].desc[entry];
desc->ds_cc = cpu_to_le16(priv->info->rx_max_desc_use);
if (!priv->rx_skb[q][entry]) {
skb = ravb_alloc_skb(ndev, info, GFP_ATOMIC);
if (!skb)
break;
dma_addr = dma_map_single(ndev->dev.parent,
skb->data,
priv->info->rx_max_frame_size,
DMA_FROM_DEVICE);
skb_checksum_none_assert(skb);
/* We just set the data size to 0 for a failed mapping
* which should prevent DMA from happening...
*/
if (dma_mapping_error(ndev->dev.parent, dma_addr))
desc->ds_cc = cpu_to_le16(0);
desc->dptr = cpu_to_le32(dma_addr);
priv->rx_skb[q][entry] = skb;
}
/* Descriptor type must be set after all the above writes */
dma_wmb();
desc->die_dt = DT_FEMPTY;
}
priv->dirty_rx[q] += ravb_rx_ring_refill(ndev, q,
priv->cur_rx[q] - priv->dirty_rx[q],
GFP_ATOMIC);
stats->rx_packets += rx_packets;
return rx_packets;
@@ -889,12 +877,10 @@ static int ravb_rx_gbeth(struct net_device *ndev, int budget, int q)
static int ravb_rx_rcar(struct net_device *ndev, int budget, int q)
{
struct ravb_private *priv = netdev_priv(ndev);
const struct ravb_hw_info *info = priv->info;
struct net_device_stats *stats = &priv->stats[q];
struct ravb_ex_rx_desc *desc;
unsigned int limit, i;
struct sk_buff *skb;
dma_addr_t dma_addr;
struct timespec64 ts;
int rx_packets = 0;
u8 desc_status;
@@ -964,31 +950,9 @@ static int ravb_rx_rcar(struct net_device *ndev, int budget, int q)
}
/* 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].ex_desc[entry];
desc->ds_cc = cpu_to_le16(priv->info->rx_max_desc_use);
if (!priv->rx_skb[q][entry]) {
skb = ravb_alloc_skb(ndev, info, GFP_ATOMIC);
if (!skb)
break; /* Better luck next round. */
dma_addr = dma_map_single(ndev->dev.parent, skb->data,
priv->info->rx_max_frame_size,
DMA_FROM_DEVICE);
skb_checksum_none_assert(skb);
/* We just set the data size to 0 for a failed mapping
* which should prevent DMA from happening...
*/
if (dma_mapping_error(ndev->dev.parent, dma_addr))
desc->ds_cc = cpu_to_le16(0);
desc->dptr = cpu_to_le32(dma_addr);
priv->rx_skb[q][entry] = skb;
}
/* Descriptor type must be set after all the above writes */
dma_wmb();
desc->die_dt = DT_FEMPTY;
}
priv->dirty_rx[q] += ravb_rx_ring_refill(ndev, q,
priv->cur_rx[q] - priv->dirty_rx[q],
GFP_ATOMIC);
stats->rx_packets += rx_packets;
return rx_packets;