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Date: Tue, 5 Oct 2021 12:06:37 +0100
From: Biju Das <biju.das.jz@...renesas.com>
To: "David S. Miller" <davem@...emloft.net>,
Jakub Kicinski <kuba@...nel.org>
Cc: Biju Das <biju.das.jz@...renesas.com>,
Sergei Shtylyov <sergei.shtylyov@...il.com>,
Geert Uytterhoeven <geert+renesas@...der.be>,
Sergey Shtylyov <s.shtylyov@...russia.ru>,
Adam Ford <aford173@...il.com>, Andrew Lunn <andrew@...n.ch>,
Yuusuke Ashizuka <ashiduka@...itsu.com>,
Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>,
netdev@...r.kernel.org, linux-renesas-soc@...r.kernel.org,
Chris Paterson <Chris.Paterson2@...esas.com>,
Biju Das <biju.das@...renesas.com>,
Prabhakar Mahadev Lad <prabhakar.mahadev-lad.rj@...renesas.com>
Subject: [RFC 07/12] ravb: Fillup ravb_rx_gbeth() stub
Fillup ravb_rx_gbeth() function to support RZ/G2L.
This patch also renames ravb_rcar_rx to ravb_rx_rcar to be
consistent with the naming convention used in sh_eth driver.
Signed-off-by: Biju Das <biju.das.jz@...renesas.com>
Reviewed-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
---
RFC changes:
* renamed "rxtop_skb" to "rx_1st_skb" and moved near to rx_skb.
* removed parameter q from "ravb_get_skb_gbeth"
* renamed ravb_rcar_rx to ravb_rx_rcar
---
drivers/net/ethernet/renesas/ravb.h | 1 +
drivers/net/ethernet/renesas/ravb_main.c | 167 ++++++++++++++++++++++-
2 files changed, 163 insertions(+), 5 deletions(-)
diff --git a/drivers/net/ethernet/renesas/ravb.h b/drivers/net/ethernet/renesas/ravb.h
index 35710da808a6..8c7b2569c7dd 100644
--- a/drivers/net/ethernet/renesas/ravb.h
+++ b/drivers/net/ethernet/renesas/ravb.h
@@ -1081,6 +1081,7 @@ struct ravb_private {
struct ravb_ex_rx_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;
struct sk_buff **rx_skb[NUM_RX_QUEUE];
struct sk_buff **tx_skb[NUM_TX_QUEUE];
u32 rx_over_errors;
diff --git a/drivers/net/ethernet/renesas/ravb_main.c b/drivers/net/ethernet/renesas/ravb_main.c
index 37164a983156..42573eac82b9 100644
--- a/drivers/net/ethernet/renesas/ravb_main.c
+++ b/drivers/net/ethernet/renesas/ravb_main.c
@@ -720,6 +720,23 @@ static void ravb_get_tx_tstamp(struct net_device *ndev)
}
}
+static void ravb_rx_csum_gbeth(struct sk_buff *skb)
+{
+ u8 *hw_csum;
+
+ /* The hardware checksum is contained in sizeof(__sum16) (2) bytes
+ * appended to packet data
+ */
+ if (unlikely(skb->len < sizeof(__sum16)))
+ return;
+ hw_csum = skb_tail_pointer(skb) - sizeof(__sum16);
+
+ if (*hw_csum == 0)
+ skb->ip_summed = CHECKSUM_UNNECESSARY;
+ else
+ skb->ip_summed = CHECKSUM_NONE;
+}
+
static void ravb_rx_csum(struct sk_buff *skb)
{
u8 *hw_csum;
@@ -735,15 +752,155 @@ static void ravb_rx_csum(struct sk_buff *skb)
skb_trim(skb, skb->len - sizeof(__sum16));
}
+static struct sk_buff *ravb_get_skb_gbeth(struct net_device *ndev, int entry,
+ struct ravb_rx_desc *desc)
+{
+ struct ravb_private *priv = netdev_priv(ndev);
+ struct sk_buff *skb;
+
+ skb = priv->rx_skb[RAVB_BE][entry];
+ priv->rx_skb[RAVB_BE][entry] = NULL;
+ dma_unmap_single(ndev->dev.parent, le32_to_cpu(desc->dptr),
+ ALIGN(GBETH_RX_BUFF_MAX, 16), DMA_FROM_DEVICE);
+
+ return skb;
+}
+
/* Packet receive function for Gigabit Ethernet */
static bool ravb_rx_gbeth(struct net_device *ndev, int *quota, int q)
{
- /* Place holder */
- return true;
+ 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;
+ u8 desc_status;
+ int boguscnt;
+ u16 pkt_len;
+ u8 die_dt;
+ int entry;
+ int limit;
+
+ entry = priv->cur_rx[q] % priv->num_rx_ring[q];
+ boguscnt = priv->dirty_rx[q] + priv->num_rx_ring[q] - priv->cur_rx[q];
+ stats = &priv->stats[q];
+
+ boguscnt = min(boguscnt, *quota);
+ limit = boguscnt;
+ desc = &priv->gbeth_rx_ring[entry];
+ while (desc->die_dt != DT_FEMPTY) {
+ /* Descriptor type must be checked before all other reads */
+ dma_rmb();
+ desc_status = desc->msc;
+ pkt_len = le16_to_cpu(desc->ds_cc) & RX_DS;
+
+ if (--boguscnt < 0)
+ break;
+
+ /* We use 0-byte descriptors to mark the DMA mapping errors */
+ if (!pkt_len)
+ continue;
+
+ if (desc_status & MSC_MC)
+ stats->multicast++;
+
+ if (desc_status & (MSC_CRC | MSC_RFE | MSC_RTSF | MSC_RTLF | MSC_CEEF)) {
+ stats->rx_errors++;
+ if (desc_status & MSC_CRC)
+ stats->rx_crc_errors++;
+ if (desc_status & MSC_RFE)
+ stats->rx_frame_errors++;
+ if (desc_status & (MSC_RTLF | MSC_RTSF))
+ stats->rx_length_errors++;
+ if (desc_status & MSC_CEEF)
+ stats->rx_missed_errors++;
+ } else {
+ die_dt = desc->die_dt & 0xF0;
+ switch (die_dt) {
+ case DT_FSINGLE:
+ skb = ravb_get_skb_gbeth(ndev, entry, desc);
+ skb_put(skb, pkt_len);
+ skb->protocol = eth_type_trans(skb, ndev);
+ if (ndev->features & NETIF_F_RXCSUM)
+ ravb_rx_csum_gbeth(skb);
+ napi_gro_receive(&priv->napi[q], skb);
+ stats->rx_packets++;
+ stats->rx_bytes += pkt_len;
+ break;
+ case DT_FSTART:
+ priv->rx_1st_skb = ravb_get_skb_gbeth(ndev, entry, desc);
+ skb_put(priv->rx_1st_skb, pkt_len);
+ break;
+ case DT_FMID:
+ skb = ravb_get_skb_gbeth(ndev, entry, desc);
+ skb_copy_to_linear_data_offset(priv->rx_1st_skb,
+ priv->rx_1st_skb->len,
+ skb->data,
+ pkt_len);
+ skb_put(priv->rx_1st_skb, pkt_len);
+ dev_kfree_skb(skb);
+ break;
+ case DT_FEND:
+ skb = ravb_get_skb_gbeth(ndev, entry, desc);
+ skb_copy_to_linear_data_offset(priv->rx_1st_skb,
+ priv->rx_1st_skb->len,
+ skb->data,
+ pkt_len);
+ skb_put(priv->rx_1st_skb, pkt_len);
+ dev_kfree_skb(skb);
+ priv->rx_1st_skb->protocol =
+ eth_type_trans(priv->rx_1st_skb, ndev);
+ if (ndev->features & NETIF_F_RXCSUM)
+ ravb_rx_csum_gbeth(skb);
+ napi_gro_receive(&priv->napi[q],
+ priv->rx_1st_skb);
+ stats->rx_packets++;
+ stats->rx_bytes += priv->rx_1st_skb->len;
+ break;
+ }
+ }
+
+ entry = (++priv->cur_rx[q]) % priv->num_rx_ring[q];
+ desc = &priv->gbeth_rx_ring[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->ds_cc = cpu_to_le16(GBETH_RX_DESC_DATA_SIZE);
+
+ if (!priv->rx_skb[q][entry]) {
+ skb = netdev_alloc_skb(ndev, info->max_rx_len);
+ if (!skb)
+ break;
+ ravb_set_buffer_align(skb);
+ dma_addr = dma_map_single(ndev->dev.parent,
+ skb->data,
+ GBETH_RX_BUFF_MAX,
+ 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;
+ }
+
+ *quota -= limit - (++boguscnt);
+
+ return boguscnt <= 0;
}
/* Packet receive function for Ethernet AVB */
-static bool ravb_rcar_rx(struct net_device *ndev, int *quota, int q)
+static bool ravb_rx_rcar(struct net_device *ndev, int *quota, int q)
{
struct ravb_private *priv = netdev_priv(ndev);
const struct ravb_hw_info *info = priv->info;
@@ -2269,7 +2426,7 @@ static const struct ravb_hw_info ravb_gen3_hw_info = {
.rx_ring_free = ravb_rx_ring_free_rcar,
.rx_ring_format = ravb_rx_ring_format_rcar,
.alloc_rx_desc = ravb_alloc_rx_desc_rcar,
- .receive = ravb_rcar_rx,
+ .receive = ravb_rx_rcar,
.set_rate = ravb_set_rate_rcar,
.set_feature = ravb_set_features_rcar,
.dmac_init = ravb_dmac_init_rcar,
@@ -2294,7 +2451,7 @@ static const struct ravb_hw_info ravb_gen2_hw_info = {
.rx_ring_free = ravb_rx_ring_free_rcar,
.rx_ring_format = ravb_rx_ring_format_rcar,
.alloc_rx_desc = ravb_alloc_rx_desc_rcar,
- .receive = ravb_rcar_rx,
+ .receive = ravb_rx_rcar,
.set_rate = ravb_set_rate_rcar,
.set_feature = ravb_set_features_rcar,
.dmac_init = ravb_dmac_init_rcar,
--
2.17.1
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