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|
/* drivers/net/ethernet/freescale/asf_gianfar.c
*
* Gianfar ASF function
*
* Description : This file is designed to add ASF functionality to gianfar.c
* This functionalities includes tx_hook for asf and some
* optimization for packet xmit.
*
* Author : Alok Makhariya
*
* Copyright 2014 Freescale Semiconductor, Inc.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version.
*
*/
#include <linux/if_vlan.h>
#include "gianfar.h"
#include "asf_gianfar.h"
#define RT_PKT_ID 0xff
#define KER_PKT_ID 0xfe
#define GFAR_RXB_REC_SZ (DEFAULT_RX_BUFFER_SIZE + RXBUF_ALIGNMENT)
devfp_hook_t devfp_rx_hook;
EXPORT_SYMBOL(devfp_rx_hook);
devfp_hook_t devfp_tx_hook;
EXPORT_SYMBOL(devfp_tx_hook);
static inline void gfar_asf_reclaim_skb(struct sk_buff *skb)
{
/* Just reset the fields used in software DPA */
skb->next = skb->prev = NULL;
skb->dev = NULL;
skb->len = 0;
skb->ip_summed = 0;
skb->transport_header = 0;
skb->mac_header = 0;
skb->network_header = 0;
skb->pkt_type = 0;
skb->mac_len = 0;
skb->protocol = 0;
skb->vlan_tci = 0;
skb->data = 0;
/* reset data and tail pointers */
skb->data = skb->head + NET_SKB_PAD;
skb_reset_tail_pointer(skb);
}
static inline void gfar_recycle_skb(struct sk_buff *skb)
{
struct sk_buff_head *h = &__get_cpu_var(skb_recycle_list);
int skb_size = SKB_DATA_ALIGN(GFAR_RXB_REC_SZ + NET_SKB_PAD
+ EXTRA_HEADROOM);
if (skb_queue_len(h) < DEFAULT_RX_RING_SIZE &&
!skb_cloned(skb) && !skb_is_nonlinear(skb) &&
skb->fclone == SKB_FCLONE_UNAVAILABLE && !skb_shared(skb) &&
skb_end_offset(skb) == skb_size) {
if (skb->pkt_type == PACKET_FASTROUTE)
gfar_asf_reclaim_skb(skb);
else
skb_recycle(skb);
gfar_align_skb(skb);
__skb_queue_head(h, skb);
return;
}
dev_kfree_skb_any(skb);
}
/* gfar_process_frame() -- handle one incoming packet if skb isn't NULL. */
static void gfar_process_frame(struct net_device *dev, struct sk_buff *skb,
int amount_pull, struct napi_struct *napi)
{
struct gfar_private *priv = netdev_priv(dev);
struct rxfcb *fcb = NULL;
/* fcb is at the beginning if exists */
fcb = (struct rxfcb *)skb->data;
/* Remove the FCB from the skb
* Remove the padded bytes, if there are any
*/
if (amount_pull) {
skb_record_rx_queue(skb, fcb->rq);
skb_pull(skb, amount_pull);
}
/* Get receive timestamp from the skb */
if (priv->hwts_rx_en) {
struct skb_shared_hwtstamps *shhwtstamps = skb_hwtstamps(skb);
u64 *ns = (u64 *) skb->data;
memset(shhwtstamps, 0, sizeof(*shhwtstamps));
shhwtstamps->hwtstamp = ns_to_ktime(*ns);
}
if (priv->padding)
skb_pull(skb, priv->padding);
if (dev->features & NETIF_F_RXCSUM)
gfar_rx_checksum(skb, fcb);
if (devfp_rx_hook) {
/* Drop the packet silently if IP Checksum is not correct */
if ((fcb->flags & RXFCB_CIP) && (fcb->flags & RXFCB_EIP)) {
dev_kfree_skb_any(skb);
return;
}
if (dev->features & NETIF_F_HW_VLAN_CTAG_RX &&
fcb->flags & RXFCB_VLN)
__vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q), fcb->vlctl);
skb->dev = dev;
if (devfp_rx_hook(skb, dev) == AS_FP_STOLEN)
return;
}
/* Tell the skb what kind of packet this is */
skb->protocol = eth_type_trans(skb, dev);
/* There's need to check for NETIF_F_HW_VLAN_CTAG_RX here.
* Even if vlan rx accel is disabled, on some chips
* RXFCB_VLN is pseudo randomly set.
*/
if (dev->features & NETIF_F_HW_VLAN_CTAG_RX &&
fcb->flags & RXFCB_VLN)
__vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q), fcb->vlctl);
/* Send the packet up the stack */
napi_gro_receive(napi, skb);
}
int gfar_asf_start_xmit(struct sk_buff *skb, struct net_device *dev)
{
struct gfar_private *priv = netdev_priv(dev);
struct gfar_priv_tx_q *tx_queue = NULL;
struct netdev_queue *txq;
struct gfar __iomem *regs = NULL;
struct txfcb *fcb = NULL;
struct txbd8 *txbdp, *txbdp_start, *base, *txbdp_tstamp = NULL;
u32 lstatus;
int i, rq = 0;
int do_tstamp, do_csum, do_vlan;
u32 bufaddr;
int skb_curtx = 0;
unsigned int nr_frags, nr_txbds, bytes_sent, fcb_len = 0;
if (devfp_tx_hook && (skb->pkt_type != PACKET_FASTROUTE))
if (devfp_tx_hook(skb, dev) == AS_FP_STOLEN)
return 0;
rq = smp_processor_id();
tx_queue = priv->tx_queue[rq];
txq = netdev_get_tx_queue(dev, rq);
base = tx_queue->tx_bd_base;
regs = tx_queue->grp->regs;
do_csum = (CHECKSUM_PARTIAL == skb->ip_summed);
do_vlan = vlan_tx_tag_present(skb);
do_tstamp = (skb_shinfo(skb)->tx_flags & SKBTX_HW_TSTAMP) &&
priv->hwts_tx_en;
if (do_csum || do_vlan)
fcb_len = GMAC_FCB_LEN;
/* check if time stamp should be generated */
if (unlikely(do_tstamp))
fcb_len = GMAC_FCB_LEN + GMAC_TXPAL_LEN;
/* make space for additional header when fcb is needed */
if (fcb_len && unlikely(skb_headroom(skb) < fcb_len)) {
struct sk_buff *skb_new;
skb_new = skb_realloc_headroom(skb, fcb_len);
if (!skb_new) {
dev->stats.tx_errors++;
kfree_skb(skb);
return NETDEV_TX_OK;
}
if (skb->sk)
skb_set_owner_w(skb_new, skb->sk);
consume_skb(skb);
skb = skb_new;
}
/* total number of fragments in the SKB */
nr_frags = skb_shinfo(skb)->nr_frags;
/* calculate the required number of TxBDs for this skb */
if (unlikely(do_tstamp))
nr_txbds = nr_frags + 2;
else
nr_txbds = nr_frags + 1;
txbdp = tx_queue->cur_tx;
skb_curtx = tx_queue->skb_curtx;
do {
lstatus = txbdp->lstatus;
if ((lstatus & BD_LFLAG(TXBD_READY))) {
u32 imask;
/* BD not free for tx */
netif_tx_stop_queue(txq);
dev->stats.tx_fifo_errors++;
spin_lock_irq(&tx_queue->grp->grplock);
imask = gfar_read(®s->imask);
imask |= IMASK_TX_DEFAULT;
gfar_write(®s->imask, imask);
spin_unlock_irq(&tx_queue->grp->grplock);
return NETDEV_TX_BUSY;
}
/* BD is free to be used by s/w */
/* Free skb for this BD if not recycled */
txbdp->lstatus &= BD_LFLAG(TXBD_WRAP);
skb_curtx = (skb_curtx + 1)
& TX_RING_MOD_MASK(tx_queue->tx_ring_size);
nr_txbds--;
if (!nr_txbds)
break;
txbdp = next_txbd(txbdp, base, tx_queue->tx_ring_size);
} while (1);
/* Update transmit stats */
bytes_sent = skb->len;
tx_queue->stats.tx_bytes += bytes_sent;
/* keep Tx bytes on wire for BQL accounting */
GFAR_CB(skb)->bytes_sent = bytes_sent;
tx_queue->stats.tx_packets++;
txbdp = txbdp_start = tx_queue->cur_tx;
lstatus = txbdp->lstatus;
/* Time stamp insertion requires one additional TxBD */
if (unlikely(do_tstamp))
txbdp_tstamp = txbdp = next_txbd(txbdp, base,
tx_queue->tx_ring_size);
if (nr_frags == 0) {
if (unlikely(do_tstamp))
txbdp_tstamp->lstatus |= BD_LFLAG(TXBD_LAST |
TXBD_INTERRUPT);
else
lstatus |= BD_LFLAG(TXBD_LAST | TXBD_INTERRUPT);
} else {
/* Place the fragment addresses and lengths into the TxBDs */
for (i = 0; i < nr_frags; i++) {
unsigned int frag_len;
/* Point at the next BD, wrapping as needed */
txbdp = next_txbd(txbdp, base, tx_queue->tx_ring_size);
frag_len = skb_shinfo(skb)->frags[i].size;
lstatus = txbdp->lstatus | frag_len |
BD_LFLAG(TXBD_READY);
/* Handle the last BD specially */
if (i == nr_frags - 1)
lstatus |= BD_LFLAG(TXBD_LAST | TXBD_INTERRUPT);
bufaddr = skb_frag_dma_map(priv->dev,
&skb_shinfo(skb)->frags[i],
0,
frag_len,
DMA_TO_DEVICE);
/* set the TxBD length and buffer pointer */
txbdp->bufPtr = bufaddr;
txbdp->lstatus = lstatus;
}
lstatus = txbdp_start->lstatus;
}
/* Add TxPAL between FCB and frame if required */
if (unlikely(do_tstamp)) {
skb_push(skb, GMAC_TXPAL_LEN);
memset(skb->data, 0, GMAC_TXPAL_LEN);
}
/* Add TxFCB if required */
if (fcb_len) {
fcb = gfar_add_fcb(skb);
lstatus |= BD_LFLAG(TXBD_TOE);
}
/* Set up checksumming */
if (do_csum) {
gfar_tx_checksum(skb, fcb, fcb_len);
if (unlikely(gfar_csum_errata_12(priv, (unsigned long)fcb)) ||
unlikely(gfar_csum_errata_76(priv, skb->len))) {
__skb_pull(skb, GMAC_FCB_LEN);
skb_checksum_help(skb);
if (do_vlan || do_tstamp) {
/* put back a new fcb for vlan/tstamp TOE */
fcb = gfar_add_fcb(skb);
} else {
/* Tx TOE not used */
lstatus &= ~(BD_LFLAG(TXBD_TOE));
fcb = NULL;
}
}
}
if (do_vlan)
gfar_tx_vlan(skb, fcb);
/* Setup tx hardware time stamping if requested */
if (unlikely(do_tstamp)) {
skb_shinfo(skb)->tx_flags |= SKBTX_IN_PROGRESS;
fcb->ptp = 1;
}
txbdp_start->bufPtr = dma_map_single(priv->dev, skb->data,
skb_headlen(skb), DMA_TO_DEVICE);
/* If time stamping is requested one additional TxBD must be set up. The
* first TxBD points to the FCB and must have a data length of
* GMAC_FCB_LEN. The second TxBD points to the actual frame data with
* the full frame length.
*/
if (unlikely(do_tstamp)) {
txbdp_tstamp->bufPtr = txbdp_start->bufPtr + fcb_len;
txbdp_tstamp->lstatus |= BD_LFLAG(TXBD_READY) |
(skb_headlen(skb) - fcb_len);
lstatus |= BD_LFLAG(TXBD_CRC | TXBD_READY) | GMAC_FCB_LEN;
} else {
lstatus |= BD_LFLAG(TXBD_CRC | TXBD_READY) | skb_headlen(skb);
}
/* We can work in parallel with gfar_clean_tx_ring(), except
* when modifying num_txbdfree. Note that we didn't grab the lock
* when we were reading the num_txbdfree and checking for available
* space, that's because outside of this function it can only grow,
* and once we've got needed space, it cannot suddenly disappear.
*
* The lock also protects us from gfar_error(), which can modify
* regs->tstat and thus retrigger the transfers, which is why we
* also must grab the lock before setting ready bit for the first
* to be transmitted BD.
*/
/* The powerpc-specific eieio() is used, as wmb() has too strong
* semantics (it requires synchronization between cacheable and
* uncacheable mappings, which eieio doesn't provide and which we
* don't need), thus requiring a more expensive sync instruction. At
* some point, the set of architecture-independent barrier functions
* should be expanded to include weaker barriers.
*/
eieio();
txbdp_start->lstatus = lstatus;
eieio(); /* force lstatus write before tx_skbuff */
skb_curtx = tx_queue->skb_curtx;
/* Update the current skb pointer to the next entry we will use
* (wrapping if necessary)
*/
tx_queue->skb_curtx = (tx_queue->skb_curtx + 1) &
TX_RING_MOD_MASK(tx_queue->tx_ring_size);
tx_queue->cur_tx = next_txbd(txbdp, base, tx_queue->tx_ring_size);
/* Tell the DMA to go go go */
gfar_write(®s->tstat, TSTAT_CLEAR_THALT >> tx_queue->qindex);
if ((skb->owner != RT_PKT_ID) ||
(!skb_is_recycleable(skb, DEFAULT_RX_BUFFER_SIZE +
RXBUF_ALIGNMENT))) {
skb->new_skb = NULL;
gfar_recycle_skb(skb);
} else {
if (skb->pkt_type == PACKET_FASTROUTE)
gfar_asf_reclaim_skb(skb);
else
skb_recycle(skb);
gfar_align_skb(skb);
skb->new_skb = skb;
}
txq->trans_start = jiffies;
return NETDEV_TX_OK;
}
irqreturn_t gfar_enable_tx_queue(int irq, void *grp_id)
{
struct gfar_priv_grp *grp = (struct gfar_priv_grp *)grp_id;
struct gfar_private *priv = priv = grp->priv;
struct gfar_priv_tx_q *tx_queue = NULL;
u32 tstat, mask;
int i;
unsigned long flags;
struct net_device *dev = NULL;
tstat = gfar_read(&grp->regs->tstat);
tstat = tstat & TSTAT_TXF_MASK_ALL;
/* Clear IEVENT */
gfar_write(&grp->regs->ievent, IEVENT_TX_MASK);
for_each_set_bit(i, &grp->tx_bit_map, priv->num_tx_queues) {
mask = TSTAT_TXF0_MASK >> i;
if (tstat & mask) {
tx_queue = priv->tx_queue[i];
dev = tx_queue->dev;
if (__netif_subqueue_stopped(dev, tx_queue->qindex))
netif_wake_subqueue(dev, tx_queue->qindex);
}
}
spin_lock_irqsave(&grp->grplock, flags);
mask = gfar_read(&grp->regs->imask);
mask = mask & IMASK_TX_DISABLED;
gfar_write(&grp->regs->imask, mask);
spin_unlock_irqrestore(&grp->grplock, flags);
return IRQ_HANDLED;
}
/* gfar_asf_clean_rx_ring() -- Processes each frame in the rx ring
* until the budget/quota has been reached. Returns the number
* of frames handled
*/
int gfar_asf_clean_rx_ring(struct gfar_priv_rx_q *rx_queue, int rx_work_limit)
{
struct net_device *dev = rx_queue->dev;
struct rxbd8 *bdp, *base;
struct sk_buff *skb;
int pkt_len;
int amount_pull;
int howmany = 0;
struct gfar_private *priv = netdev_priv(dev);
/* Get the first full descriptor */
bdp = rx_queue->cur_rx;
base = rx_queue->rx_bd_base;
amount_pull = priv->uses_rxfcb ? GMAC_FCB_LEN : 0;
while (!((bdp->status & RXBD_EMPTY) || (--rx_work_limit < 0))) {
struct sk_buff *newskb = NULL;
/* Adding memory barrier */
rmb();
skb = rx_queue->rx_skbuff[rx_queue->skb_currx];
dma_unmap_single(priv->dev, bdp->bufPtr,
priv->rx_buffer_size, DMA_FROM_DEVICE);
if (unlikely(!(bdp->status & RXBD_ERR) &&
bdp->length > priv->rx_buffer_size))
bdp->status = RXBD_LARGE;
if (unlikely(!(bdp->status & RXBD_LAST) ||
bdp->status & RXBD_ERR)) {
count_errors(bdp->status, dev);
newskb = skb;
} else {
/* Increment the number of packets */
rx_queue->stats.rx_packets++;
howmany++;
if (likely(skb)) {
pkt_len = bdp->length - ETH_FCS_LEN;
/* Remove the FCS from the packet length */
skb_put(skb, pkt_len);
rx_queue->stats.rx_bytes += pkt_len;
skb_record_rx_queue(skb, rx_queue->qindex);
skb->owner = RT_PKT_ID;
gfar_process_frame(dev, skb, amount_pull,
&rx_queue->grp->napi_rx);
newskb = skb->new_skb;
skb->owner = 0;
skb->new_skb = NULL;
} else {
netif_warn(priv, rx_err, dev, "Missing skb!\n");
rx_queue->stats.rx_dropped++;
atomic64_inc(&priv->extra_stats.rx_skbmissing);
}
}
if (!newskb) {
/* Allocate new skb for Rx ring */
newskb = gfar_new_skb(dev);
}
if (!newskb)
/* All memory Exhausted,a BUG */
BUG();
rx_queue->rx_skbuff[rx_queue->skb_currx] = newskb;
/* Setup the new bdp */
gfar_new_rxbdp(rx_queue, bdp, newskb);
/* Update to the next pointer */
bdp = next_bd(bdp, base, rx_queue->rx_ring_size);
/* update to point at the next skb */
rx_queue->skb_currx = (rx_queue->skb_currx + 1) &
RX_RING_MOD_MASK(rx_queue->rx_ring_size);
}
/* Update the current rxbd pointer to be the next one */
rx_queue->cur_rx = bdp;
return howmany;
}
/* This is function is called directly by ASF when ASF runs in Minimal mode
* transmission.
*/
int gfar_fast_xmit(struct sk_buff *skb, struct net_device *dev)
{
struct gfar_private *priv = netdev_priv(dev);
struct gfar_priv_tx_q *tx_queue = NULL;
struct netdev_queue *txq;
struct gfar __iomem *regs = NULL;
struct txbd8 *txbdp, *txbdp_start, *base;
u32 lstatus;
int rq = 0;
int skb_curtx = 0;
unsigned int fcb_length = GMAC_FCB_LEN;
rq = smp_processor_id();
tx_queue = priv->tx_queue[rq];
txq = netdev_get_tx_queue(dev, rq);
base = tx_queue->tx_bd_base;
regs = tx_queue->grp->regs;
txbdp = tx_queue->cur_tx;
skb_curtx = tx_queue->skb_curtx;
lstatus = txbdp->lstatus;
if ((lstatus & BD_LFLAG(TXBD_READY))) {
u32 imask;
/* BD not free for tx */
netif_tx_stop_queue(txq);
dev->stats.tx_fifo_errors++;
spin_lock_irq(&tx_queue->grp->grplock);
imask = gfar_read(®s->imask);
imask |= IMASK_TX_DEFAULT;
gfar_write(®s->imask, imask);
spin_unlock_irq(&tx_queue->grp->grplock);
return NETDEV_TX_BUSY;
}
/* BD is free to be used by s/w */
/* Free skb for this BD if not recycled */
txbdp->lstatus &= BD_LFLAG(TXBD_WRAP);
/* Update transmit stats */
tx_queue->stats.tx_bytes += skb->len;
tx_queue->stats.tx_packets++;
txbdp = txbdp_start = tx_queue->cur_tx;
lstatus = txbdp->lstatus | BD_LFLAG(TXBD_LAST | TXBD_INTERRUPT);
/* Set up checksumming */
if (CHECKSUM_PARTIAL == skb->ip_summed) {
struct txfcb *fcb = NULL;
fcb = gfar_add_fcb(skb);
lstatus |= BD_LFLAG(TXBD_TOE);
gfar_tx_checksum(skb, fcb, fcb_length);
}
txbdp_start->bufPtr = dma_map_single(priv->dev, skb->data,
skb_headlen(skb), DMA_TO_DEVICE);
lstatus |= BD_LFLAG(TXBD_CRC | TXBD_READY) | skb_headlen(skb);
/* The powerpc-specific eieio() is used, as wmb() has too strong
* semantics (it requires synchronization between cacheable and
* uncacheable mappings, which eieio doesn't provide and which we
* don't need), thus requiring a more expensive sync instruction. At
* some point, the set of architecture-independent barrier functions
* should be expanded to include weaker barriers.
*/
eieio();
txbdp_start->lstatus = lstatus;
eieio(); /* force lstatus write before tx_skbuff */
skb_curtx = tx_queue->skb_curtx;
/* Update the current skb pointer to the next entry we will use
* (wrapping if necessary)
*/
tx_queue->skb_curtx = (tx_queue->skb_curtx + 1) &
TX_RING_MOD_MASK(tx_queue->tx_ring_size);
tx_queue->cur_tx = next_txbd(txbdp, base, tx_queue->tx_ring_size);
/* Tell the DMA to go go go */
gfar_write(®s->tstat, TSTAT_CLEAR_THALT >> tx_queue->qindex);
if ((skb->owner != RT_PKT_ID) ||
(!skb_is_recycleable(skb, DEFAULT_RX_BUFFER_SIZE +
RXBUF_ALIGNMENT))) {
skb->new_skb = NULL;
gfar_recycle_skb(skb);
} else {
gfar_asf_reclaim_skb(skb);
gfar_align_skb(skb);
skb->new_skb = skb;
}
txq->trans_start = jiffies;
return NETDEV_TX_OK;
}
EXPORT_SYMBOL(gfar_fast_xmit);
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