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r8169: factor out rtl8169_tx_map

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Factor out mapping the tx skb to a new function rtl8169_tx_map(). This
allows to remove redundancies, and rtl8169_get_txd_opts1() has only
one user left, so it can be inlined.
As a result rtl8169_xmit_frags() is significantly simplified, and in
rtl8169_start_xmit() the code is simplified and better readable.
No functional change intended.

Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Heiner Kallweit 2020-03-30 01:53:39 +02:00 committed by David S. Miller
parent 033c6f3b78
commit b8447abc4c
1 changed files with 50 additions and 60 deletions
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110
drivers/net/ethernet/realtek/r8169_main.c
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@ -4040,54 +4040,55 @@ static void rtl8169_tx_timeout(struct net_device *dev, unsigned int txqueue)
rtl_schedule_task(tp, RTL_FLAG_TASK_RESET_PENDING);
}
static __le32 rtl8169_get_txd_opts1(u32 opts0, u32 len, unsigned int entry)
static int rtl8169_tx_map(struct rtl8169_private *tp, const u32 *opts, u32 len,
void *addr, unsigned int entry, bool desc_own)
{
u32 status = opts0 | len;
struct TxDesc *txd = tp->TxDescArray + entry;
struct device *d = tp_to_dev(tp);
dma_addr_t mapping;
u32 opts1;
int ret;
mapping = dma_map_single(d, addr, len, DMA_TO_DEVICE);
ret = dma_mapping_error(d, mapping);
if (unlikely(ret)) {
if (net_ratelimit())
netif_err(tp, drv, tp->dev, "Failed to map TX data!\n");
return ret;
}
txd->addr = cpu_to_le64(mapping);
txd->opts2 = cpu_to_le32(opts[1]);
opts1 = opts[0] | len;
if (entry == NUM_TX_DESC - 1)
status |= RingEnd;
opts1 |= RingEnd;
if (desc_own)
opts1 |= DescOwn;
txd->opts1 = cpu_to_le32(opts1);
return cpu_to_le32(status);
tp->tx_skb[entry].len = len;
return 0;
}
static int rtl8169_xmit_frags(struct rtl8169_private *tp, struct sk_buff *skb,
u32 *opts)
const u32 *opts, unsigned int entry)
{
struct skb_shared_info *info = skb_shinfo(skb);
unsigned int cur_frag, entry;
struct TxDesc *uninitialized_var(txd);
struct device *d = tp_to_dev(tp);
unsigned int cur_frag;
entry = tp->cur_tx;
for (cur_frag = 0; cur_frag < info->nr_frags; cur_frag++) {
const skb_frag_t *frag = info->frags + cur_frag;
dma_addr_t mapping;
u32 len;
void *addr;
void *addr = skb_frag_address(frag);
u32 len = skb_frag_size(frag);
entry = (entry + 1) % NUM_TX_DESC;
txd = tp->TxDescArray + entry;
len = skb_frag_size(frag);
addr = skb_frag_address(frag);
mapping = dma_map_single(d, addr, len, DMA_TO_DEVICE);
if (unlikely(dma_mapping_error(d, mapping))) {
if (net_ratelimit())
netif_err(tp, drv, tp->dev,
"Failed to map TX fragments DMA!\n");
if (unlikely(rtl8169_tx_map(tp, opts, len, addr, entry, true)))
goto err_out;
}
txd->opts1 = rtl8169_get_txd_opts1(opts[0], len, entry);
txd->opts2 = cpu_to_le32(opts[1]);
txd->addr = cpu_to_le64(mapping);
tp->tx_skb[entry].len = len;
}
tp->tx_skb[entry].skb = skb;
txd->opts1 |= cpu_to_le32(LastFrag);
return 0;
err_out:
@ -4216,52 +4217,41 @@ static netdev_tx_t rtl8169_start_xmit(struct sk_buff *skb,
unsigned int frags = skb_shinfo(skb)->nr_frags;
struct rtl8169_private *tp = netdev_priv(dev);
unsigned int entry = tp->cur_tx % NUM_TX_DESC;
struct TxDesc *txd = tp->TxDescArray + entry;
struct device *d = tp_to_dev(tp);
dma_addr_t mapping;
u32 opts[2], len;
bool stop_queue;
bool door_bell;
struct TxDesc *txd_first, *txd_last;
bool stop_queue, door_bell;
u32 opts[2];
txd_first = tp->TxDescArray + entry;
if (unlikely(!rtl_tx_slots_avail(tp, frags))) {
netif_err(tp, drv, dev, "BUG! Tx Ring full when queue awake!\n");
goto err_stop_0;
}
if (unlikely(le32_to_cpu(txd->opts1) & DescOwn))
if (unlikely(le32_to_cpu(txd_first->opts1) & DescOwn))
goto err_stop_0;
opts[1] = rtl8169_tx_vlan_tag(skb);
opts[0] = DescOwn;
opts[0] = 0;
if (rtl_chip_supports_csum_v2(tp)) {
if (!rtl8169_tso_csum_v2(tp, skb, opts))
goto err_dma_0;
} else {
if (!rtl_chip_supports_csum_v2(tp))
rtl8169_tso_csum_v1(skb, opts);
}
len = skb_headlen(skb);
mapping = dma_map_single(d, skb->data, len, DMA_TO_DEVICE);
if (unlikely(dma_mapping_error(d, mapping))) {
if (net_ratelimit())
netif_err(tp, drv, dev, "Failed to map TX DMA!\n");
else if (!rtl8169_tso_csum_v2(tp, skb, opts))
goto err_dma_0;
}
tp->tx_skb[entry].len = len;
txd->addr = cpu_to_le64(mapping);
if (unlikely(rtl8169_tx_map(tp, opts, skb_headlen(skb), skb->data,
entry, false)))
goto err_dma_0;
if (!frags) {
opts[0] |= FirstFrag | LastFrag;
tp->tx_skb[entry].skb = skb;
} else {
if (rtl8169_xmit_frags(tp, skb, opts))
if (frags) {
if (rtl8169_xmit_frags(tp, skb, opts, entry))
goto err_dma_1;
opts[0] |= FirstFrag;
entry = (entry + frags) % NUM_TX_DESC;
}
txd->opts2 = cpu_to_le32(opts[1]);
txd_last = tp->TxDescArray + entry;
txd_last->opts1 |= cpu_to_le32(LastFrag);
tp->tx_skb[entry].skb = skb;
skb_tx_timestamp(skb);
@ -4270,7 +4260,7 @@ static netdev_tx_t rtl8169_start_xmit(struct sk_buff *skb,
door_bell = __netdev_sent_queue(dev, skb->len, netdev_xmit_more());
txd->opts1 = rtl8169_get_txd_opts1(opts[0], len, entry);
txd_first->opts1 |= cpu_to_le32(DescOwn | FirstFrag);
/* Force all memory writes to complete before notifying device */
wmb();