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Date: Wed, 24 Sep 2014 14:05:30 +0800
From: Fugang Duan <b38611@...escale.com>
To: <b20596@...escale.com>, <davem@...emloft.net>
CC: <netdev@...r.kernel.org>, <shawn.guo@...aro.org>,
<bhutchings@...arflare.com>, <b38611@...escale.com>
Subject: [PATCH] net: fec: remove memory copy for rx path
Re-allocate skb instead of memory copy skb data in rx path to improve
enet rx performance.
Signed-off-by: Fugang Duan <B38611@...escale.com>
Signed-off-by: Frank Li <Frank.Li@...escale.com>
---
drivers/net/ethernet/freescale/fec_main.c | 90 +++++++++++++++--------------
1 files changed, 47 insertions(+), 43 deletions(-)
diff --git a/drivers/net/ethernet/freescale/fec_main.c b/drivers/net/ethernet/freescale/fec_main.c
index 2b16ead..1fc8e52 100644
--- a/drivers/net/ethernet/freescale/fec_main.c
+++ b/drivers/net/ethernet/freescale/fec_main.c
@@ -1322,6 +1322,28 @@ fec_enet_tx(struct net_device *ndev)
return;
}
+static int
+fec_enet_new_rxbdp(struct net_device *ndev, struct bufdesc *bdp, struct sk_buff *skb)
+{
+ struct fec_enet_private *fep = netdev_priv(ndev);
+ int off;
+
+ off = ((unsigned long)skb->data) & fep->rx_align;
+ if (off)
+ skb_reserve(skb, fep->rx_align + 1 - off);
+
+ bdp->cbd_bufaddr = dma_map_single(&fep->pdev->dev, skb->data,
+ FEC_ENET_RX_FRSIZE - fep->rx_align,
+ DMA_FROM_DEVICE);
+ if (dma_mapping_error(&fep->pdev->dev, bdp->cbd_bufaddr)) {
+ if (net_ratelimit())
+ netdev_err(ndev, "Rx DMA memory map failed\n");
+ return -ENOMEM;
+ }
+
+ return 0;
+}
+
/* During a receive, the cur_rx points to the current incoming buffer.
* When we update through the ring, if the next incoming buffer has
* not been given to the system, we just set the empty indicator,
@@ -1336,7 +1358,8 @@ fec_enet_rx_queue(struct net_device *ndev, int budget, u16 queue_id)
struct fec_enet_priv_rx_q *rxq;
struct bufdesc *bdp;
unsigned short status;
- struct sk_buff *skb;
+ struct sk_buff *skb_new = NULL;
+ struct sk_buff *skb_cur;
ushort pkt_len;
__u8 *data;
int pkt_received = 0;
@@ -1402,9 +1425,10 @@ fec_enet_rx_queue(struct net_device *ndev, int budget, u16 queue_id)
index = fec_enet_get_bd_index(rxq->rx_bd_base, bdp, fep);
data = rxq->rx_skbuff[index]->data;
- dma_sync_single_for_cpu(&fep->pdev->dev, bdp->cbd_bufaddr,
- FEC_ENET_RX_FRSIZE - fep->rx_align,
- DMA_FROM_DEVICE);
+ skb_cur = rxq->rx_skbuff[index];
+ dma_unmap_single(&fep->pdev->dev, bdp->cbd_bufaddr,
+ FEC_ENET_RX_FRSIZE - fep->rx_align,
+ DMA_FROM_DEVICE);
if (id_entry->driver_data & FEC_QUIRK_SWAP_FRAME)
swap_buffer(data, pkt_len);
@@ -1427,57 +1451,50 @@ fec_enet_rx_queue(struct net_device *ndev, int budget, u16 queue_id)
vlan_packet_rcvd = true;
}
- /* This does 16 byte alignment, exactly what we need.
- * The packet length includes FCS, but we don't want to
- * include that when passing upstream as it messes up
- * bridging applications.
- */
- skb = netdev_alloc_skb(ndev, pkt_len - 4 + NET_IP_ALIGN);
+ skb_new = netdev_alloc_skb(ndev, FEC_ENET_RX_FRSIZE);
- if (unlikely(!skb)) {
+ if (unlikely(!skb_new)) {
ndev->stats.rx_dropped++;
} else {
- int payload_offset = (2 * ETH_ALEN);
- skb_reserve(skb, NET_IP_ALIGN);
- skb_put(skb, pkt_len - 4); /* Make room */
+ skb_put(skb_cur, pkt_len - 4); /* Make room */
/* Extract the frame data without the VLAN header. */
- skb_copy_to_linear_data(skb, data, (2 * ETH_ALEN));
- if (vlan_packet_rcvd)
- payload_offset = (2 * ETH_ALEN) + VLAN_HLEN;
- skb_copy_to_linear_data_offset(skb, (2 * ETH_ALEN),
- data + payload_offset,
- pkt_len - 4 - (2 * ETH_ALEN));
+ if (vlan_packet_rcvd) {
+ skb_copy_to_linear_data_offset(skb_cur, VLAN_HLEN,
+ data, (2 * ETH_ALEN));
+ skb_pull(skb_cur, VLAN_HLEN);
+ }
- skb->protocol = eth_type_trans(skb, ndev);
+ skb_cur->protocol = eth_type_trans(skb_cur, ndev);
/* Get receive timestamp from the skb */
if (fep->hwts_rx_en && fep->bufdesc_ex)
fec_enet_hwtstamp(fep, ebdp->ts,
- skb_hwtstamps(skb));
+ skb_hwtstamps(skb_cur));
if (fep->bufdesc_ex &&
(fep->csum_flags & FLAG_RX_CSUM_ENABLED)) {
if (!(ebdp->cbd_esc & FLAG_RX_CSUM_ERROR)) {
/* don't check it */
- skb->ip_summed = CHECKSUM_UNNECESSARY;
+ skb_cur->ip_summed = CHECKSUM_UNNECESSARY;
} else {
- skb_checksum_none_assert(skb);
+ skb_checksum_none_assert(skb_cur);
}
}
/* Handle received VLAN packets */
if (vlan_packet_rcvd)
- __vlan_hwaccel_put_tag(skb,
+ __vlan_hwaccel_put_tag(skb_cur,
htons(ETH_P_8021Q),
vlan_tag);
- napi_gro_receive(&fep->napi, skb);
+ napi_gro_receive(&fep->napi, skb_cur);
}
- dma_sync_single_for_device(&fep->pdev->dev, bdp->cbd_bufaddr,
- FEC_ENET_RX_FRSIZE - fep->rx_align,
- DMA_FROM_DEVICE);
+ /* set the new skb */
+ rxq->rx_skbuff[index] = skb_new;
+ fec_enet_new_rxbdp(ndev, bdp, skb_new);
+
rx_processing_done:
/* Clear the status flags for this buffer */
status &= ~BD_ENET_RX_STATS;
@@ -2553,33 +2570,20 @@ fec_enet_alloc_rxq_buffers(struct net_device *ndev, unsigned int queue)
struct sk_buff *skb;
struct bufdesc *bdp;
struct fec_enet_priv_rx_q *rxq;
- unsigned int off;
rxq = fep->rx_queue[queue];
bdp = rxq->rx_bd_base;
for (i = 0; i < rxq->rx_ring_size; i++) {
- dma_addr_t addr;
-
skb = netdev_alloc_skb(ndev, FEC_ENET_RX_FRSIZE);
if (!skb)
goto err_alloc;
- off = ((unsigned long)skb->data) & fep->rx_align;
- if (off)
- skb_reserve(skb, fep->rx_align + 1 - off);
-
- addr = dma_map_single(&fep->pdev->dev, skb->data,
- FEC_ENET_RX_FRSIZE - fep->rx_align, DMA_FROM_DEVICE);
-
- if (dma_mapping_error(&fep->pdev->dev, addr)) {
+ if (fec_enet_new_rxbdp(ndev, bdp, skb)) {
dev_kfree_skb(skb);
- if (net_ratelimit())
- netdev_err(ndev, "Rx DMA memory map failed\n");
goto err_alloc;
}
rxq->rx_skbuff[i] = skb;
- bdp->cbd_bufaddr = addr;
bdp->cbd_sc = BD_ENET_RX_EMPTY;
if (fep->bufdesc_ex) {
--
1.7.8
--
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