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Merge branch 'gianfar-xmit-improvements'

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Claudiu Manoil says:

====================
gianfar: xmit() improvements

Remove redundant operations, improve code locality and maintainability.
Thanks.

V2: Updated first patch to not touch existing wmb().
====================

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller 2016-02-24 16:55:58 -05:00
commit 5aba818685
1 changed files with 48 additions and 52 deletions
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100
drivers/net/ethernet/freescale/gianfar.c
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@ -2322,6 +2322,7 @@ static int gfar_start_xmit(struct sk_buff *skb, struct net_device *dev)
struct txfcb *fcb = NULL;
struct txbd8 *txbdp, *txbdp_start, *base, *txbdp_tstamp = NULL;
u32 lstatus;
skb_frag_t *frag;
int i, rq = 0;
int do_tstamp, do_csum, do_vlan;
u32 bufaddr;
@ -2389,52 +2390,6 @@ static int gfar_start_xmit(struct sk_buff *skb, struct net_device *dev)
txbdp = txbdp_start = tx_queue->cur_tx;
lstatus = be32_to_cpu(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)) {
u32 lstatus_ts = be32_to_cpu(txbdp_tstamp->lstatus);
lstatus_ts |= BD_LFLAG(TXBD_LAST | TXBD_INTERRUPT);
txbdp_tstamp->lstatus = cpu_to_be32(lstatus_ts);
} 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 = be32_to_cpu(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);
if (unlikely(dma_mapping_error(priv->dev, bufaddr)))
goto dma_map_err;
/* set the TxBD length and buffer pointer */
txbdp->bufPtr = cpu_to_be32(bufaddr);
txbdp->lstatus = cpu_to_be32(lstatus);
}
lstatus = be32_to_cpu(txbdp_start->lstatus);
}
/* Add TxPAL between FCB and frame if required */
if (unlikely(do_tstamp)) {
skb_push(skb, GMAC_TXPAL_LEN);
@ -2469,12 +2424,6 @@ static int gfar_start_xmit(struct sk_buff *skb, struct net_device *dev)
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;
}
bufaddr = dma_map_single(priv->dev, skb->data, skb_headlen(skb),
DMA_TO_DEVICE);
if (unlikely(dma_mapping_error(priv->dev, bufaddr)))
@ -2482,6 +2431,46 @@ static int gfar_start_xmit(struct sk_buff *skb, struct net_device *dev)
txbdp_start->bufPtr = cpu_to_be32(bufaddr);
/* Time stamp insertion requires one additional TxBD */
if (unlikely(do_tstamp))
txbdp_tstamp = txbdp = next_txbd(txbdp, base,
tx_queue->tx_ring_size);
if (likely(!nr_frags)) {
lstatus |= BD_LFLAG(TXBD_LAST | TXBD_INTERRUPT);
} else {
u32 lstatus_start = lstatus;
/* Place the fragment addresses and lengths into the TxBDs */
frag = &skb_shinfo(skb)->frags[0];
for (i = 0; i < nr_frags; i++, frag++) {
unsigned int size;
/* Point at the next BD, wrapping as needed */
txbdp = next_txbd(txbdp, base, tx_queue->tx_ring_size);
size = skb_frag_size(frag);
lstatus = be32_to_cpu(txbdp->lstatus) | size |
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, frag, 0,
size, DMA_TO_DEVICE);
if (unlikely(dma_mapping_error(priv->dev, bufaddr)))
goto dma_map_err;
/* set the TxBD length and buffer pointer */
txbdp->bufPtr = cpu_to_be32(bufaddr);
txbdp->lstatus = cpu_to_be32(lstatus);
}
lstatus = lstatus_start;
}
/* 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
@ -2492,12 +2481,19 @@ static int gfar_start_xmit(struct sk_buff *skb, struct net_device *dev)
bufaddr = be32_to_cpu(txbdp_start->bufPtr);
bufaddr += fcb_len;
lstatus_ts |= BD_LFLAG(TXBD_READY) |
(skb_headlen(skb) - fcb_len);
if (!nr_frags)
lstatus_ts |= BD_LFLAG(TXBD_LAST | TXBD_INTERRUPT);
txbdp_tstamp->bufPtr = cpu_to_be32(bufaddr);
txbdp_tstamp->lstatus = cpu_to_be32(lstatus_ts);
lstatus |= BD_LFLAG(TXBD_CRC | TXBD_READY) | GMAC_FCB_LEN;
/* Setup tx hardware time stamping */
skb_shinfo(skb)->tx_flags |= SKBTX_IN_PROGRESS;
fcb->ptp = 1;
} else {
lstatus |= BD_LFLAG(TXBD_CRC | TXBD_READY) | skb_headlen(skb);
}