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Message-id: <00c401cf4221$9ab634a0$d0229de0$@samsung.com>
Date: Mon, 17 Mar 2014 13:43:45 -0700
From: Byungho An <bh74.an@...sung.com>
To: netdev@...r.kernel.org, linux-samsung-soc@...r.kernel.org
Cc: davem@...emloft.net, vipul.pandya@...sung.com,
ilho215.lee@...sung.com
Subject: [PATCH V3 5/8] net: sxgbe: add Checksum offload support for Samsung
sxgbe
From: Vipul Pandya <vipul.pandya@...sung.com>
This patch adds TX and RX checksum offload support.
Signed-off-by: Vipul Pandya <vipul.pandya@...sung.com>
Neatening-by: Joe Perches <joe@...ches.com>
Signed-off-by: Byungho An <bh74.an@...sung.com>
---
drivers/net/ethernet/samsung/sxgbe/sxgbe_common.h | 5 +++
drivers/net/ethernet/samsung/sxgbe/sxgbe_core.c | 20 +++++++++
drivers/net/ethernet/samsung/sxgbe/sxgbe_desc.h | 6 +--
drivers/net/ethernet/samsung/sxgbe/sxgbe_main.c | 46 ++++++++++++++++-----
4 files changed, 63 insertions(+), 14 deletions(-)
diff --git a/drivers/net/ethernet/samsung/sxgbe/sxgbe_common.h b/drivers/net/ethernet/samsung/sxgbe/sxgbe_common.h
index 0d8ed8a..c915789 100644
--- a/drivers/net/ethernet/samsung/sxgbe/sxgbe_common.h
+++ b/drivers/net/ethernet/samsung/sxgbe/sxgbe_common.h
@@ -337,6 +337,10 @@ struct sxgbe_core_ops {
void (*set_eee_timer)(void __iomem *ioaddr, const int ls,
const int tw);
void (*set_eee_pls)(void __iomem *ioaddr, const int link);
+
+ /* Enable disable checksum offload operations */
+ void (*enable_rx_csum)(void __iomem *ioaddr);
+ void (*disable_rx_csum)(void __iomem *ioaddr);
};
const struct sxgbe_core_ops *sxgbe_get_core_ops(void);
@@ -447,6 +451,7 @@ struct sxgbe_priv_data {
struct device *device;
struct sxgbe_ops *hw;/* sxgbe specific ops */
int no_csum_insertion;
+ int rxcsum_insertion;
spinlock_t stats_lock;
struct phy_device *phydev;
diff --git a/drivers/net/ethernet/samsung/sxgbe/sxgbe_core.c b/drivers/net/ethernet/samsung/sxgbe/sxgbe_core.c
index bf93b16..5885fd6 100644
--- a/drivers/net/ethernet/samsung/sxgbe/sxgbe_core.c
+++ b/drivers/net/ethernet/samsung/sxgbe/sxgbe_core.c
@@ -217,6 +217,24 @@ static void sxgbe_set_eee_timer(void __iomem *ioaddr,
writel(value, ioaddr + SXGBE_CORE_LPI_TIMER_CTRL);
}
+static void sxgbe_enable_rx_csum(void __iomem *ioaddr)
+{
+ u32 ctrl;
+
+ ctrl = readl(ioaddr + SXGBE_CORE_RX_CONFIG_REG);
+ ctrl |= SXGBE_RX_CSUMOFFLOAD_ENABLE;
+ writel(ctrl, ioaddr + SXGBE_CORE_RX_CONFIG_REG);
+}
+
+static void sxgbe_disable_rx_csum(void __iomem *ioaddr)
+{
+ u32 ctrl;
+
+ ctrl = readl(ioaddr + SXGBE_CORE_RX_CONFIG_REG);
+ ctrl &= ~SXGBE_RX_CSUMOFFLOAD_ENABLE;
+ writel(ctrl, ioaddr + SXGBE_CORE_RX_CONFIG_REG);
+}
+
const struct sxgbe_core_ops core_ops = {
.core_init = sxgbe_core_init,
.dump_regs = sxgbe_core_dump_regs,
@@ -233,6 +251,8 @@ const struct sxgbe_core_ops core_ops = {
.reset_eee_mode = sxgbe_reset_eee_mode,
.set_eee_timer = sxgbe_set_eee_timer,
.set_eee_pls = sxgbe_set_eee_pls,
+ .enable_rx_csum = sxgbe_enable_rx_csum,
+ .disable_rx_csum = sxgbe_disable_rx_csum,
};
const struct sxgbe_core_ops *sxgbe_get_core_ops(void)
diff --git a/drivers/net/ethernet/samsung/sxgbe/sxgbe_desc.h b/drivers/net/ethernet/samsung/sxgbe/sxgbe_desc.h
index 547edf3..3c0b5a8 100644
--- a/drivers/net/ethernet/samsung/sxgbe/sxgbe_desc.h
+++ b/drivers/net/ethernet/samsung/sxgbe/sxgbe_desc.h
@@ -113,7 +113,7 @@ struct sxgbe_rx_norm_desc {
/* WB RDES3 */
u32 pkt_len:14;
u32 rdes3_reserved:1;
- u32 err_summary:15;
+ u32 err_summary:1;
u32 err_l2_type:4;
u32 layer34_pkt_type:4;
u32 no_coagulation_pkt:1;
@@ -273,8 +273,8 @@ struct sxgbe_desc_ops {
int (*get_rx_ld_status)(struct sxgbe_rx_norm_desc *p);
/* Return the reception status looking at the RDES1 */
- void (*rx_wbstatus)(struct sxgbe_rx_norm_desc *p,
- struct sxgbe_extra_stats *x);
+ int (*rx_wbstatus)(struct sxgbe_rx_norm_desc *p,
+ struct sxgbe_extra_stats *x, int *checksum);
/* Get own bit */
int (*get_rx_ctxt_owner)(struct sxgbe_rx_ctxt_desc *p);
diff --git a/drivers/net/ethernet/samsung/sxgbe/sxgbe_main.c b/drivers/net/ethernet/samsung/sxgbe/sxgbe_main.c
index 93e2c64..6780dd4 100644
--- a/drivers/net/ethernet/samsung/sxgbe/sxgbe_main.c
+++ b/drivers/net/ethernet/samsung/sxgbe/sxgbe_main.c
@@ -1279,6 +1279,7 @@ void sxgbe_tso_prepare(struct sxgbe_priv_data *priv,
static netdev_tx_t sxgbe_xmit(struct sk_buff *skb, struct net_device *dev)
{
unsigned int entry, frag_num;
+ int cksum_flag = 0;
struct netdev_queue *dev_txq;
unsigned txq_index = skb_get_queue_mapping(skb);
struct sxgbe_priv_data *priv = netdev_priv(dev);
@@ -1350,7 +1351,7 @@ static netdev_tx_t sxgbe_xmit(struct sk_buff *skb, struct net_device *dev)
__func__);
priv->hw->desc->prepare_tx_desc(tx_desc, 1, no_pagedlen,
- no_pagedlen);
+ no_pagedlen, cksum_flag);
}
}
@@ -1367,7 +1368,7 @@ static netdev_tx_t sxgbe_xmit(struct sk_buff *skb, struct net_device *dev)
/* prepare the descriptor */
priv->hw->desc->prepare_tx_desc(tx_desc, 0, len,
- len);
+ len, cksum_flag);
/* memory barrier to flush descriptor */
wmb();
@@ -1493,6 +1494,8 @@ static int sxgbe_rx(struct sxgbe_priv_data *priv, int limit)
unsigned int entry = priv->rxq[qnum]->cur_rx;
unsigned int next_entry = 0;
unsigned int count = 0;
+ int checksum;
+ int status;
while (count < limit) {
struct sxgbe_rx_norm_desc *p;
@@ -1509,7 +1512,18 @@ static int sxgbe_rx(struct sxgbe_priv_data *priv, int limit)
next_entry = (++priv->rxq[qnum]->cur_rx) % rxsize;
prefetch(priv->rxq[qnum]->dma_rx + next_entry);
- /*TO DO read the status of the incoming frame */
+ /* Read the status of the incoming frame and also get checksum
+ * value based on whether it is enabled in SXGBE hardware or
+ * not.
+ */
+ status = priv->hw->desc->rx_wbstatus(p, &priv->xstats,
+ &checksum);
+ if (unlikely(status < 0)) {
+ entry = next_entry;
+ continue;
+ }
+ if (unlikely(!priv->rxcsum_insertion))
+ checksum = CHECKSUM_NONE;
skb = priv->rxq[qnum]->rx_skbuff[entry];
@@ -1523,7 +1537,11 @@ static int sxgbe_rx(struct sxgbe_priv_data *priv, int limit)
skb_put(skb, frame_len);
- netif_receive_skb(skb);
+ skb->ip_summed = checksum;
+ if (checksum == CHECKSUM_NONE)
+ netif_receive_skb(skb);
+ else
+ napi_gro_receive(&priv->napi, skb);
entry = next_entry;
}
@@ -1756,15 +1774,15 @@ static int sxgbe_set_features(struct net_device *dev,
{
struct sxgbe_priv_data *priv = netdev_priv(dev);
netdev_features_t changed = dev->features ^ features;
- u32 ctrl;
if (changed & NETIF_F_RXCSUM) {
- ctrl = readl(priv->ioaddr + SXGBE_CORE_RX_CONFIG_REG);
- if (features & NETIF_F_RXCSUM)
- ctrl |= SXGBE_RX_CSUMOFFLOAD_ENABLE;
- else
- ctrl &= ~SXGBE_RX_CSUMOFFLOAD_ENABLE;
- writel(ctrl, priv->ioaddr + SXGBE_CORE_RX_CONFIG_REG);
+ if (features & NETIF_F_RXCSUM) {
+ priv->hw->mac->enable_rx_csum(priv->ioaddr);
+ priv->rxcsum_insertion = true;
+ } else {
+ priv->hw->mac->disable_rx_csum(priv->ioaddr);
+ priv->rxcsum_insertion = false;
+ }
}
return 0;
@@ -2124,6 +2142,12 @@ struct sxgbe_priv_data *sxgbe_dvr_probe(struct device *device,
}
}
+ /* Enable Rx checksum offload */
+ if (priv->hw_cap.rx_csum_offload) {
+ priv->hw->mac->enable_rx_csum(priv->ioaddr);
+ priv->rxcsum_insertion = true;
+ }
+
/* Rx Watchdog is available, enable depend on platform data */
if (!priv->plat->riwt_off) {
priv->use_riwt = 1;
--
1.7.10.4
--
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