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Message-Id: <20231127115334.3670790-4-yoshihiro.shimoda.uh@renesas.com>
Date: Mon, 27 Nov 2023 20:53:28 +0900
From: Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>
To: s.shtylyov@....ru,
davem@...emloft.net,
edumazet@...gle.com,
kuba@...nel.org,
pabeni@...hat.com
Cc: netdev@...r.kernel.org,
linux-renesas-soc@...r.kernel.org,
Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>
Subject: [PATCH net-next 3/9] net: rswitch: Use build_skb() for RX
If this hardware receives a jumbo frame like 2KiB or more, it will be
split into multiple queues. In near the future, to support this, use
build_skb() instead of netdev_alloc_skb_ip_align().
Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>
---
drivers/net/ethernet/renesas/rswitch.c | 72 +++++++++++++++-----------
drivers/net/ethernet/renesas/rswitch.h | 19 ++++++-
2 files changed, 58 insertions(+), 33 deletions(-)
diff --git a/drivers/net/ethernet/renesas/rswitch.c b/drivers/net/ethernet/renesas/rswitch.c
index 0928003ad245..8337c860eb9a 100644
--- a/drivers/net/ethernet/renesas/rswitch.c
+++ b/drivers/net/ethernet/renesas/rswitch.c
@@ -235,19 +235,18 @@ static bool rswitch_is_queue_rxed(struct rswitch_gwca_queue *gq)
return false;
}
-static int rswitch_gwca_queue_alloc_skb(struct rswitch_gwca_queue *gq,
- unsigned int start_index,
- unsigned int num)
+static int rswitch_gwca_queue_alloc_rx_buf(struct rswitch_gwca_queue *gq,
+ unsigned int start_index,
+ unsigned int num)
{
unsigned int i, index;
for (i = 0; i < num; i++) {
index = (i + start_index) % gq->ring_size;
- if (gq->skbs[index])
+ if (gq->rx_bufs[index])
continue;
- gq->skbs[index] = netdev_alloc_skb_ip_align(gq->ndev,
- PKT_BUF_SZ + RSWITCH_ALIGN - 1);
- if (!gq->skbs[index])
+ gq->rx_bufs[index] = netdev_alloc_frag(RSWITCH_BUF_SIZE);
+ if (!gq->rx_bufs[index])
goto err;
}
@@ -256,8 +255,8 @@ static int rswitch_gwca_queue_alloc_skb(struct rswitch_gwca_queue *gq,
err:
for (; i-- > 0; ) {
index = (i + start_index) % gq->ring_size;
- dev_kfree_skb(gq->skbs[index]);
- gq->skbs[index] = NULL;
+ skb_free_frag(gq->rx_bufs[index]);
+ gq->rx_bufs[index] = NULL;
}
return -ENOMEM;
@@ -275,16 +274,17 @@ static void rswitch_gwca_queue_free(struct net_device *ndev,
gq->rx_ring = NULL;
for (i = 0; i < gq->ring_size; i++)
- dev_kfree_skb(gq->skbs[i]);
+ skb_free_frag(gq->rx_bufs[i]);
+ kfree(gq->rx_bufs);
+ gq->rx_bufs = NULL;
} else {
dma_free_coherent(ndev->dev.parent,
sizeof(struct rswitch_ext_desc) *
(gq->ring_size + 1), gq->tx_ring, gq->ring_dma);
gq->tx_ring = NULL;
+ kfree(gq->skbs);
+ gq->skbs = NULL;
}
-
- kfree(gq->skbs);
- gq->skbs = NULL;
}
static void rswitch_gwca_ts_queue_free(struct rswitch_private *priv)
@@ -308,17 +308,19 @@ static int rswitch_gwca_queue_alloc(struct net_device *ndev,
gq->ring_size = ring_size;
gq->ndev = ndev;
- gq->skbs = kcalloc(gq->ring_size, sizeof(*gq->skbs), GFP_KERNEL);
- if (!gq->skbs)
- return -ENOMEM;
-
if (!dir_tx) {
- rswitch_gwca_queue_alloc_skb(gq, 0, gq->ring_size);
+ gq->rx_bufs = kcalloc(gq->ring_size, sizeof(*gq->rx_bufs), GFP_KERNEL);
+ if (!gq->rx_bufs)
+ goto out;
+ rswitch_gwca_queue_alloc_rx_buf(gq, 0, gq->ring_size);
gq->rx_ring = dma_alloc_coherent(ndev->dev.parent,
sizeof(struct rswitch_ext_ts_desc) *
(gq->ring_size + 1), &gq->ring_dma, GFP_KERNEL);
} else {
+ gq->skbs = kcalloc(gq->ring_size, sizeof(*gq->skbs), GFP_KERNEL);
+ if (!gq->skbs)
+ return -ENOMEM;
gq->tx_ring = dma_alloc_coherent(ndev->dev.parent,
sizeof(struct rswitch_ext_desc) *
(gq->ring_size + 1), &gq->ring_dma, GFP_KERNEL);
@@ -367,12 +369,13 @@ static int rswitch_gwca_queue_format(struct net_device *ndev,
for (i = 0, desc = gq->tx_ring; i < gq->ring_size; i++, desc++) {
if (!gq->dir_tx) {
dma_addr = dma_map_single(ndev->dev.parent,
- gq->skbs[i]->data, PKT_BUF_SZ,
+ gq->rx_bufs[i] + RSWITCH_HEADROOM,
+ RSWITCH_MAP_BUF_SIZE,
DMA_FROM_DEVICE);
if (dma_mapping_error(ndev->dev.parent, dma_addr))
goto err;
- desc->desc.info_ds = cpu_to_le16(PKT_BUF_SZ);
+ desc->desc.info_ds = cpu_to_le16(RSWITCH_DESC_BUF_SIZE);
rswitch_desc_set_dptr(&desc->desc, dma_addr);
desc->desc.die_dt = DT_FEMPTY | DIE;
} else {
@@ -395,8 +398,8 @@ static int rswitch_gwca_queue_format(struct net_device *ndev,
if (!gq->dir_tx) {
for (desc = gq->tx_ring; i-- > 0; desc++) {
dma_addr = rswitch_desc_get_dptr(&desc->desc);
- dma_unmap_single(ndev->dev.parent, dma_addr, PKT_BUF_SZ,
- DMA_FROM_DEVICE);
+ dma_unmap_single(ndev->dev.parent, dma_addr,
+ RSWITCH_MAP_BUF_SIZE, DMA_FROM_DEVICE);
}
}
@@ -433,12 +436,13 @@ static int rswitch_gwca_queue_ext_ts_fill(struct net_device *ndev,
desc = &gq->rx_ring[index];
if (!gq->dir_tx) {
dma_addr = dma_map_single(ndev->dev.parent,
- gq->skbs[index]->data, PKT_BUF_SZ,
+ gq->rx_bufs[index] + RSWITCH_HEADROOM,
+ RSWITCH_MAP_BUF_SIZE,
DMA_FROM_DEVICE);
if (dma_mapping_error(ndev->dev.parent, dma_addr))
goto err;
- desc->desc.info_ds = cpu_to_le16(PKT_BUF_SZ);
+ desc->desc.info_ds = cpu_to_le16(RSWITCH_DESC_BUF_SIZE);
rswitch_desc_set_dptr(&desc->desc, dma_addr);
dma_wmb();
desc->desc.die_dt = DT_FEMPTY | DIE;
@@ -456,8 +460,8 @@ static int rswitch_gwca_queue_ext_ts_fill(struct net_device *ndev,
index = (i + start_index) % gq->ring_size;
desc = &gq->rx_ring[index];
dma_addr = rswitch_desc_get_dptr(&desc->desc);
- dma_unmap_single(ndev->dev.parent, dma_addr, PKT_BUF_SZ,
- DMA_FROM_DEVICE);
+ dma_unmap_single(ndev->dev.parent, dma_addr,
+ RSWITCH_MAP_BUF_SIZE, DMA_FROM_DEVICE);
}
}
@@ -724,10 +728,15 @@ static bool rswitch_rx(struct net_device *ndev, int *quota)
while ((desc->desc.die_dt & DT_MASK) != DT_FEMPTY) {
dma_rmb();
pkt_len = le16_to_cpu(desc->desc.info_ds) & RX_DS;
- skb = gq->skbs[gq->cur];
- gq->skbs[gq->cur] = NULL;
dma_addr = rswitch_desc_get_dptr(&desc->desc);
- dma_unmap_single(ndev->dev.parent, dma_addr, PKT_BUF_SZ, DMA_FROM_DEVICE);
+ dma_unmap_single(ndev->dev.parent, dma_addr,
+ RSWITCH_MAP_BUF_SIZE, DMA_FROM_DEVICE);
+ skb = build_skb(gq->rx_bufs[gq->cur], RSWITCH_BUF_SIZE);
+ if (!skb)
+ goto out;
+ skb_reserve(skb, RSWITCH_HEADROOM);
+ skb_put(skb, pkt_len);
+
get_ts = rdev->priv->ptp_priv->tstamp_rx_ctrl & RCAR_GEN4_RXTSTAMP_TYPE_V2_L2_EVENT;
if (get_ts) {
struct skb_shared_hwtstamps *shhwtstamps;
@@ -739,12 +748,13 @@ static bool rswitch_rx(struct net_device *ndev, int *quota)
ts.tv_nsec = __le32_to_cpu(desc->ts_nsec & cpu_to_le32(0x3fffffff));
shhwtstamps->hwtstamp = timespec64_to_ktime(ts);
}
- skb_put(skb, pkt_len);
skb->protocol = eth_type_trans(skb, ndev);
napi_gro_receive(&rdev->napi, skb);
rdev->ndev->stats.rx_packets++;
rdev->ndev->stats.rx_bytes += pkt_len;
+out:
+ gq->rx_bufs[gq->cur] = NULL;
gq->cur = rswitch_next_queue_index(gq, true, 1);
desc = &gq->rx_ring[gq->cur];
@@ -753,7 +763,7 @@ static bool rswitch_rx(struct net_device *ndev, int *quota)
}
num = rswitch_get_num_cur_queues(gq);
- ret = rswitch_gwca_queue_alloc_skb(gq, gq->dirty, num);
+ ret = rswitch_gwca_queue_alloc_rx_buf(gq, gq->dirty, num);
if (ret < 0)
goto err;
ret = rswitch_gwca_queue_ext_ts_fill(ndev, gq, gq->dirty, num);
diff --git a/drivers/net/ethernet/renesas/rswitch.h b/drivers/net/ethernet/renesas/rswitch.h
index f1c7f7cdefc2..a407d85dcfad 100644
--- a/drivers/net/ethernet/renesas/rswitch.h
+++ b/drivers/net/ethernet/renesas/rswitch.h
@@ -29,8 +29,13 @@
#define RX_RING_SIZE 1024
#define TS_RING_SIZE (TX_RING_SIZE * RSWITCH_NUM_PORTS)
-#define PKT_BUF_SZ 1584
+#define RSWITCH_HEADROOM (NET_SKB_PAD + NET_IP_ALIGN)
+#define RSWITCH_DESC_BUF_SIZE 2048
+#define RSWITCH_TAILROOM SKB_DATA_ALIGN(sizeof(struct skb_shared_info))
#define RSWITCH_ALIGN 128
+#define RSWITCH_BUF_SIZE (RSWITCH_HEADROOM + RSWITCH_DESC_BUF_SIZE + \
+ RSWITCH_TAILROOM + RSWITCH_ALIGN)
+#define RSWITCH_MAP_BUF_SIZE (RSWITCH_BUF_SIZE - RSWITCH_HEADROOM)
#define RSWITCH_MAX_CTAG_PCP 7
#define RSWITCH_TIMEOUT_US 100000
@@ -945,8 +950,18 @@ struct rswitch_gwca_queue {
/* For [rt]x_ring */
unsigned int index;
bool dir_tx;
- struct sk_buff **skbs;
struct net_device *ndev; /* queue to ndev for irq */
+
+ union {
+ /* For TX */
+ struct {
+ struct sk_buff **skbs;
+ };
+ /* For RX */
+ struct {
+ void **rx_bufs;
+ };
+ };
};
struct rswitch_gwca_ts_info {
--
2.34.1
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