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Date: Fri, 30 May 2014 10:05:52 +0800
From: Fugang Duan <b38611@...escale.com>
To: <b20596@...escale.com>, <davem@...emloft.net>
CC: <ezequiel.garcia@...e-electrons.com>, <netdev@...r.kernel.org>,
<shawn.guo@...aro.org>, <bhutchings@...arflare.com>,
<b38611@...escale.com>, <stephen@...workplumber.org>
Subject: [PATCH v1 6/6] net: fec: Add software TSO support
Add software TSO support for FEC.i
This feature allows to improve outbound throughput performance.
Tested on imx6dl sabresd board, running iperf tcp tests shows:
- 16.2% improvement comparing with FEC SG patch
- 82% improvement comparing with NO SG & TSO patch
$ ethtool -K eth0 tso on
[ 3] local 10.192.242.108 port 35388 connected with 10.192.242.167 port 5001
[ ID] Interval Transfer Bandwidth
[ 3] 0.0- 3.0 sec 181 MBytes 506 Mbits/sec
Signed-off-by: Fugang Duan <B38611@...escale.com>
---
drivers/net/ethernet/freescale/fec.h | 4 +
drivers/net/ethernet/freescale/fec_main.c | 185 ++++++++++++++++++++++++++++-
2 files changed, 187 insertions(+), 2 deletions(-)
diff --git a/drivers/net/ethernet/freescale/fec.h b/drivers/net/ethernet/freescale/fec.h
index 57f3ecf..caba87d 100644
--- a/drivers/net/ethernet/freescale/fec.h
+++ b/drivers/net/ethernet/freescale/fec.h
@@ -299,6 +299,10 @@ struct fec_enet_private {
unsigned short tx_ring_size;
unsigned short rx_ring_size;
+ /* Software TSO */
+ char *tso_hdrs;
+ dma_addr_t tso_hdrs_dma;
+
struct platform_device *pdev;
int opened;
diff --git a/drivers/net/ethernet/freescale/fec_main.c b/drivers/net/ethernet/freescale/fec_main.c
index a96ed3a..cd20344 100644
--- a/drivers/net/ethernet/freescale/fec_main.c
+++ b/drivers/net/ethernet/freescale/fec_main.c
@@ -36,6 +36,7 @@
#include <linux/in.h>
#include <linux/ip.h>
#include <net/ip.h>
+#include <net/tso.h>
#include <linux/tcp.h>
#include <linux/udp.h>
#include <linux/icmp.h>
@@ -227,6 +228,8 @@ MODULE_PARM_DESC(macaddr, "FEC Ethernet MAC address");
#define FEC_PAUSE_FLAG_AUTONEG 0x1
#define FEC_PAUSE_FLAG_ENABLE 0x2
+#define TSO_HEADER_SIZE 128
+
static int mii_cnt;
static inline
@@ -554,6 +557,174 @@ static int fec_enet_txq_submit_skb(struct sk_buff *skb, struct net_device *ndev)
return 0;
}
+static int
+fec_enet_txq_put_data_tso(struct sk_buff *skb, struct net_device *ndev,
+ struct bufdesc *bdp, int index, char *data,
+ int size, bool last_tcp, bool is_last)
+{
+ struct fec_enet_private *fep = netdev_priv(ndev);
+ const struct platform_device_id *id_entry =
+ platform_get_device_id(fep->pdev);
+ struct bufdesc_ex *ebdp = (struct bufdesc_ex *)bdp;
+ unsigned short status;
+ unsigned int estatus = 0;
+
+ status = bdp->cbd_sc;
+ status &= ~BD_ENET_TX_STATS;
+
+ status |= (BD_ENET_TX_TC | BD_ENET_TX_READY);
+ bdp->cbd_datlen = size;
+
+ if (((unsigned long) data) & FEC_ALIGNMENT) {
+ memcpy(fep->tx_bounce[index], data, size);
+ data = fep->tx_bounce[index];
+ }
+ if (id_entry->driver_data & FEC_QUIRK_SWAP_FRAME)
+ swap_buffer(data, size);
+
+ bdp->cbd_bufaddr = dma_map_single(&fep->pdev->dev, data,
+ size, DMA_TO_DEVICE);
+ if (dma_mapping_error(&fep->pdev->dev, bdp->cbd_bufaddr)) {
+ dev_kfree_skb_any(skb);
+ if (net_ratelimit())
+ netdev_err(ndev, "Tx DMA memory map failed\n");
+ return NETDEV_TX_BUSY;
+ }
+
+ if (fep->bufdesc_ex) {
+ if (skb->ip_summed == CHECKSUM_PARTIAL)
+ estatus |= BD_ENET_TX_PINS | BD_ENET_TX_IINS;
+ ebdp->cbd_bdu = 0;
+ ebdp->cbd_esc = estatus;
+ }
+
+ /* Handle the last BD specially */
+ if (last_tcp)
+ status |= (BD_ENET_TX_LAST | BD_ENET_TX_TC);
+ if (is_last) {
+ status |= BD_ENET_TX_INTR;
+ if (fep->bufdesc_ex)
+ ebdp->cbd_esc |= BD_ENET_TX_INT;
+ }
+
+ bdp->cbd_sc = status;
+
+ return 0;
+}
+
+static void
+fec_enet_txq_put_hdr_tso(struct sk_buff *skb, struct net_device *ndev,
+ struct bufdesc *bdp, int index)
+{
+ struct fec_enet_private *fep = netdev_priv(ndev);
+ const struct platform_device_id *id_entry =
+ platform_get_device_id(fep->pdev);
+ int hdr_len = skb_transport_offset(skb) + tcp_hdrlen(skb);
+ struct bufdesc_ex *ebdp = (struct bufdesc_ex *)bdp;
+ void *bufaddr;
+ unsigned short status;
+ unsigned int estatus = 0;
+
+ status = bdp->cbd_sc;
+ status &= ~BD_ENET_TX_STATS;
+ status |= (BD_ENET_TX_TC | BD_ENET_TX_READY);
+
+ bufaddr = fep->tso_hdrs + index * TSO_HEADER_SIZE;
+ if (((unsigned long) bufaddr) & FEC_ALIGNMENT) {
+ memcpy(fep->tx_bounce[index], skb->data, hdr_len);
+ bufaddr = fep->tx_bounce[index];
+ }
+ if (id_entry->driver_data & FEC_QUIRK_SWAP_FRAME)
+ swap_buffer(bufaddr, hdr_len);
+
+ bdp->cbd_bufaddr = fep->tso_hdrs_dma + index * TSO_HEADER_SIZE;
+ bdp->cbd_datlen = hdr_len;
+
+ if (fep->bufdesc_ex) {
+ if (skb->ip_summed == CHECKSUM_PARTIAL)
+ estatus |= BD_ENET_TX_PINS | BD_ENET_TX_IINS;
+ ebdp->cbd_bdu = 0;
+ ebdp->cbd_esc = estatus;
+ }
+
+ bdp->cbd_sc = status;
+}
+
+static int fec_enet_txq_submit_tso(struct sk_buff *skb, struct net_device *ndev)
+{
+ struct fec_enet_private *fep = netdev_priv(ndev);
+ int hdr_len = skb_transport_offset(skb) + tcp_hdrlen(skb);
+ int total_len, data_left;
+ struct bufdesc *bdp = fep->cur_tx;
+ struct tso_t tso;
+ unsigned int index = 0;
+ int ret;
+
+ if (tso_count_descs(skb) >= fec_enet_txdesc_entry_free(fep)) {
+ if (net_ratelimit())
+ netdev_err(ndev, "tx queue full!\n");
+ return NETDEV_TX_BUSY;
+ }
+
+ /* Protocol checksum off-load for TCP and UDP. */
+ if (fec_enet_clear_csum(skb, ndev)) {
+ dev_kfree_skb_any(skb);
+ return NETDEV_TX_OK;
+ }
+
+ /* Initialize the TSO handler, and prepare the first payload */
+ tso_start(skb, &tso);
+
+ total_len = skb->len - hdr_len;
+ while (total_len > 0) {
+ char *hdr;
+
+ index = fec_enet_get_bd_index(bdp, fep);
+ data_left = min_t(int, skb_shinfo(skb)->gso_size, total_len);
+ total_len -= data_left;
+
+ /* prepare packet headers: MAC + IP + TCP */
+ hdr = fep->tso_hdrs + index * TSO_HEADER_SIZE;
+ tso_build_hdr(skb, hdr, &tso, data_left, total_len == 0);
+ fec_enet_txq_put_hdr_tso(skb, ndev, bdp, index);
+
+ while (data_left > 0) {
+ int size;
+
+ size = min_t(int, tso.size, data_left);
+ bdp = fec_enet_get_nextdesc(bdp, fep);
+ index = fec_enet_get_bd_index(bdp, fep);
+ ret = fec_enet_txq_put_data_tso(skb, ndev, bdp, index, tso.data,
+ size, size == data_left,
+ total_len == 0);
+ if (ret)
+ goto err_release;
+
+ data_left -= size;
+ tso_build_data(skb, &tso, size);
+ }
+
+ bdp = fec_enet_get_nextdesc(bdp, fep);
+ }
+
+ /* Save skb pointer */
+ fep->tx_skbuff[index] = skb;
+
+ fec_enet_submit_work(bdp, fep);
+
+ skb_tx_timestamp(skb);
+ fep->cur_tx = bdp;
+
+ /* Trigger transmission start */
+ writel(0, fep->hwp + FEC_X_DES_ACTIVE);
+
+ return 0;
+
+err_release:
+ /* TODO: Release all used data descriptors for TSO */
+ return ret;
+}
+
static netdev_tx_t
fec_enet_start_xmit(struct sk_buff *skb, struct net_device *ndev)
{
@@ -577,7 +748,10 @@ fec_enet_start_xmit(struct sk_buff *skb, struct net_device *ndev)
return NETDEV_TX_BUSY;
}
- ret = fec_enet_txq_submit_skb(skb, ndev);
+ if (skb_is_gso(skb))
+ ret = fec_enet_txq_submit_tso(skb, ndev);
+ else
+ ret = fec_enet_txq_submit_skb(skb, ndev);
if (ret)
return ret;
@@ -2198,6 +2372,13 @@ static int fec_enet_init(struct net_device *ndev)
if (!cbd_base)
return -ENOMEM;
+ fep->tso_hdrs = dma_alloc_coherent(NULL, fep->tx_ring_size * TSO_HEADER_SIZE,
+ &fep->tso_hdrs_dma, GFP_KERNEL);
+ if (!fep->tso_hdrs) {
+ dma_free_coherent(NULL, bd_size, cbd_base, fep->bd_dma);
+ return -ENOMEM;
+ }
+
memset(cbd_base, 0, PAGE_SIZE);
fep->netdev = ndev;
@@ -2230,7 +2411,7 @@ static int fec_enet_init(struct net_device *ndev)
if (id_entry->driver_data & FEC_QUIRK_HAS_CSUM) {
/* enable hw accelerator */
ndev->features |= (NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM
- | NETIF_F_RXCSUM | NETIF_F_SG);
+ | NETIF_F_RXCSUM | NETIF_F_SG | NETIF_F_TSO);
fep->csum_flags |= FLAG_RX_CSUM_ENABLED;
}
--
1.7.8
--
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