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Date: Tue, 16 Apr 2013 11:25:27 +0100
From: Jim Baxter <jim_baxter@...tor.com>
To: "David S. Miller" <davem@...emloft.net>
Cc: Frank Li <Frank.Li@...escale.com>,
Fugang Duan <B38611@...escale.com>, netdev@...r.kernel.org
Subject: [PATCH 1/1] net: fec: Enable imx6 enet checksum acceleration.
Enables hardware generatation of IP header and
protocol specific checksums for transmitted
packets.
Enabled hardware discarding of received packets with
invalid IP header or protocol specific checksums.
The feature is enabled by default but can be
enabled/disabled by ethtool.
Signed-off-by: Fugang Duan <B38611@...escale.com>
Signed-off-by: Jim Baxter <jim_baxter@...tor.com>
---
drivers/net/ethernet/freescale/fec.h | 9 +-
drivers/net/ethernet/freescale/fec_main.c | 134 +++++++++++++++++++++++++++++
2 files changed, 142 insertions(+), 1 deletion(-)
diff --git a/drivers/net/ethernet/freescale/fec.h b/drivers/net/ethernet/freescale/fec.h
index eb43729..f558a1a 100644
--- a/drivers/net/ethernet/freescale/fec.h
+++ b/drivers/net/ethernet/freescale/fec.h
@@ -52,6 +52,7 @@
#define FEC_R_FIFO_RSEM 0x194 /* Receive FIFO section empty threshold */
#define FEC_R_FIFO_RAEM 0x198 /* Receive FIFO almost empty threshold */
#define FEC_R_FIFO_RAFL 0x19c /* Receive FIFO almost full threshold */
+#define FEC_RACC 0x1C4 /* Receive Accelerator function */
#define FEC_MIIGSK_CFGR 0x300 /* MIIGSK Configuration reg */
#define FEC_MIIGSK_ENR 0x308 /* MIIGSK Enable reg */
@@ -164,9 +165,11 @@ struct bufdesc_ex {
#define BD_ENET_TX_CSL ((ushort)0x0001)
#define BD_ENET_TX_STATS ((ushort)0x03ff) /* All status bits */
-/*enhanced buffer desciptor control/status used by Ethernet transmit*/
+/*enhanced buffer descriptor control/status used by Ethernet transmit*/
#define BD_ENET_TX_INT 0x40000000
#define BD_ENET_TX_TS 0x20000000
+#define BD_ENET_TX_PINS 0x10000000
+#define BD_ENET_TX_IINS 0x08000000
/* This device has up to three irqs on some platforms */
@@ -190,6 +193,9 @@ struct bufdesc_ex {
#define BD_ENET_RX_INT 0x00800000
#define BD_ENET_RX_PTP ((ushort)0x0400)
+#define BD_ENET_RX_ICE 0x00000020
+#define BD_ENET_RX_PCR 0x00000010
+#define FLAG_RX_CSUM_ENABLED (BD_ENET_RX_ICE | BD_ENET_RX_PCR)
/* The FEC buffer descriptors track the ring buffers. The rx_bd_base and
* tx_bd_base always point to the base of the buffer descriptors. The
@@ -247,6 +253,7 @@ struct fec_enet_private {
int pause_flag;
struct napi_struct napi;
+ int csum_flags;
struct ptp_clock *ptp_clock;
struct ptp_clock_info ptp_caps;
diff --git a/drivers/net/ethernet/freescale/fec_main.c b/drivers/net/ethernet/freescale/fec_main.c
index d7657a4..738a57d 100644
--- a/drivers/net/ethernet/freescale/fec_main.c
+++ b/drivers/net/ethernet/freescale/fec_main.c
@@ -34,6 +34,12 @@
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/skbuff.h>
+#include <linux/in.h>
+#include <linux/ip.h>
+#include <net/ip.h>
+#include <linux/tcp.h>
+#include <linux/udp.h>
+#include <linux/icmp.h>
#include <linux/spinlock.h>
#include <linux/workqueue.h>
#include <linux/bitops.h>
@@ -181,6 +187,10 @@ MODULE_PARM_DESC(macaddr, "FEC Ethernet MAC address");
#define PKT_MINBUF_SIZE 64
#define PKT_MAXBLR_SIZE 1520
+/* FEC receive accleration */
+#define FEC_RACC_IPDIS (1 << 1)
+#define FEC_RACC_PRODIS (1 << 2)
+
/*
* The 5270/5271/5280/5282/532x RX control register also contains maximum frame
* size bits. Other FEC hardware does not, so we need to take that into
@@ -241,6 +251,52 @@ static void *swap_buffer(void *bufaddr, int len)
return bufaddr;
}
+static void
+fec_enet_clear_csum(struct sk_buff *skb, struct net_device *ndev)
+{
+ if (!(ndev->features & NETIF_F_HW_CSUM))
+ return;
+ /* Only run for packets requiring a checksum. */
+ if (skb->ip_summed != CHECKSUM_PARTIAL)
+ return;
+ if (skb->len < (ETH_HLEN + sizeof(struct iphdr)))
+ return;
+
+ if (skb->protocol == htons(ETH_P_IP)) {
+ ip_hdr(skb)->check = 0;
+
+ switch (ip_hdr(skb)->protocol) {
+ case IPPROTO_UDP:
+ if (skb->len < (ETH_HLEN +
+ (ip_hdr(skb)->ihl << 2) +
+ sizeof(struct udphdr)))
+ return;
+ skb_set_transport_header(skb,
+ ETH_HLEN + ip_hdrlen(skb));
+ udp_hdr(skb)->check = 0;
+ break;
+ case IPPROTO_TCP:
+ if (skb->len < (ETH_HLEN +
+ (ip_hdr(skb)->ihl << 2) +
+ sizeof(struct tcphdr)))
+ return;
+ if (tcp_hdr(skb))
+ tcp_hdr(skb)->check = 0;
+ break;
+ case IPPROTO_ICMP:
+ if (skb->len < (ETH_HLEN +
+ (ip_hdr(skb)->ihl << 2) +
+ sizeof(struct icmphdr)))
+ return;
+ if (icmp_hdr(skb))
+ icmp_hdr(skb)->checksum = 0;
+ break;
+ default:
+ break;
+ }
+ }
+}
+
static netdev_tx_t
fec_enet_start_xmit(struct sk_buff *skb, struct net_device *ndev)
{
@@ -277,6 +333,9 @@ fec_enet_start_xmit(struct sk_buff *skb, struct net_device *ndev)
bufaddr = skb->data;
bdp->cbd_datlen = skb->len;
+ /* HW accleration for ICMP TCP UDP checksum */
+ fec_enet_clear_csum(skb, ndev);
+
/*
* On some FEC implementations data must be aligned on
* 4-byte boundaries. Use bounce buffers to copy data
@@ -328,6 +387,10 @@ fec_enet_start_xmit(struct sk_buff *skb, struct net_device *ndev)
} else {
ebdp->cbd_esc = BD_ENET_TX_INT;
+ if ((ndev->features & NETIF_F_HW_CSUM) &&
+ (skb->ip_summed == CHECKSUM_PARTIAL))
+ ebdp->cbd_esc |= BD_ENET_TX_PINS
+ | BD_ENET_TX_IINS;
}
}
/* If this was the last BD in the ring, start at the beginning again. */
@@ -407,6 +470,7 @@ fec_restart(struct net_device *ndev, int duplex)
const struct platform_device_id *id_entry =
platform_get_device_id(fep->pdev);
int i;
+ u32 val;
u32 temp_mac[2];
u32 rcntl = OPT_FRAME_SIZE | 0x04;
u32 ecntl = 0x2; /* ETHEREN */
@@ -473,6 +537,14 @@ fec_restart(struct net_device *ndev, int duplex)
/* Set MII speed */
writel(fep->phy_speed, fep->hwp + FEC_MII_SPEED);
+ /* set RX checksum */
+ val = readl(fep->hwp + FEC_RACC);
+ if (fep->csum_flags & FLAG_RX_CSUM_ENABLED)
+ val |= (FEC_RACC_IPDIS | FEC_RACC_PRODIS);
+ else
+ val &= ~(FEC_RACC_IPDIS | FEC_RACC_PRODIS);
+ writel(val, fep->hwp + FEC_RACC);
+
/*
* The phy interface and speed need to get configured
* differently on enet-mac.
@@ -818,6 +890,19 @@ fec_enet_rx(struct net_device *ndev, int budget)
spin_unlock_irqrestore(&fep->tmreg_lock, flags);
}
+ if (fep->bufdesc_ex &&
+ (fep->csum_flags & FLAG_RX_CSUM_ENABLED)) {
+ struct bufdesc_ex *ebdp =
+ (struct bufdesc_ex *)bdp;
+ if (!(ebdp->cbd_esc & FLAG_RX_CSUM_ENABLED)) {
+ /* don't check it */
+ skb->ip_summed = CHECKSUM_UNNECESSARY;
+ } else {
+ ndev->stats.rx_errors++;
+ skb_checksum_none_assert(skb);
+ }
+ }
+
if (!skb_defer_rx_timestamp(skb))
napi_gro_receive(&fep->napi, skb);
}
@@ -1439,6 +1524,9 @@ static int fec_enet_alloc_buffers(struct net_device *ndev)
if (fep->bufdesc_ex) {
struct bufdesc_ex *ebdp = (struct bufdesc_ex *)bdp;
ebdp->cbd_esc = BD_ENET_TX_INT;
+ if (ndev->features & NETIF_F_HW_CSUM)
+ ebdp->cbd_esc |= BD_ENET_TX_PINS
+ | BD_ENET_TX_IINS;
}
bdp = fec_enet_get_nextdesc(bdp, fep->bufdesc_ex);
@@ -1457,6 +1545,7 @@ fec_enet_open(struct net_device *ndev)
struct fec_enet_private *fep = netdev_priv(ndev);
int ret;
+ ndev->features |= NETIF_F_GRO;
napi_enable(&fep->napi);
/* I should reset the ring buffers here, but I don't yet know
@@ -1618,6 +1707,44 @@ static void fec_poll_controller(struct net_device *dev)
}
#endif
+static netdev_features_t fec_fix_features(struct net_device *netdev,
+ netdev_features_t features)
+{
+ return features;
+}
+
+static int fec_set_features(struct net_device *netdev,
+ netdev_features_t features)
+{
+ struct fec_enet_private *fep = netdev_priv(netdev);
+ netdev_features_t changed = features ^ netdev->features;
+ bool restart_required = false;
+
+ netdev->features = features;
+
+ /* Receive checksum has been changed */
+ if (changed & NETIF_F_GRO) {
+ restart_required = true;
+ if (features & NETIF_F_GRO)
+ fep->csum_flags |= FLAG_RX_CSUM_ENABLED;
+ else
+ fep->csum_flags &= ~FLAG_RX_CSUM_ENABLED;
+ }
+
+ /* Restart the network interface */
+ if (true == restart_required) {
+ if (netif_running(netdev)) {
+ fec_stop(netdev);
+ fec_restart(netdev, fep->phy_dev->duplex);
+ netif_wake_queue(netdev);
+ } else {
+ fec_restart(netdev, fep->phy_dev->duplex);
+ }
+ }
+
+ return 0;
+}
+
static const struct net_device_ops fec_netdev_ops = {
.ndo_open = fec_enet_open,
.ndo_stop = fec_enet_close,
@@ -1631,6 +1758,8 @@ static const struct net_device_ops fec_netdev_ops = {
#ifdef CONFIG_NET_POLL_CONTROLLER
.ndo_poll_controller = fec_poll_controller,
#endif
+ .ndo_fix_features = fec_fix_features,
+ .ndo_set_features = fec_set_features,
};
/*
@@ -1672,6 +1801,11 @@ static int fec_enet_init(struct net_device *ndev)
writel(FEC_RX_DISABLED_IMASK, fep->hwp + FEC_IMASK);
netif_napi_add(ndev, &fep->napi, fec_enet_rx_napi, FEC_NAPI_WEIGHT);
+ /* enable hw accelerator */
+ ndev->features |= (NETIF_F_HW_CSUM | NETIF_F_GRO);
+ ndev->hw_features |= (NETIF_F_HW_CSUM | NETIF_F_GRO);
+ fep->csum_flags |= FLAG_RX_CSUM_ENABLED;
+
fec_restart(ndev, 0);
return 0;
--
1.7.10.4
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