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Message-ID: <f6b6aad5-7010-42a5-b17d-f0b95f5c94f0@loongson.cn>
Date: Tue, 6 Feb 2024 17:02:29 +0800
From: Yanteng Si <siyanteng@...ngson.cn>
To: Serge Semin <fancer.lancer@...il.com>
Cc: andrew@...n.ch, hkallweit1@...il.com, peppe.cavallaro@...com,
alexandre.torgue@...s.st.com, joabreu@...opsys.com, Jose.Abreu@...opsys.com,
chenhuacai@...ngson.cn, linux@...linux.org.uk, guyinggang@...ngson.cn,
netdev@...r.kernel.org, chris.chenfeiyang@...il.com
Subject: Re: [PATCH net-next v8 01/11] net: stmmac: Add multi-channel support
在 2024/2/5 07:28, Serge Semin 写道:
> On Tue, Jan 30, 2024 at 04:43:21PM +0800, Yanteng Si wrote:
>> DW GMAC v3.x multi-channels feature is implemented as multiple
>> sets of the same CSRs. Here is only preliminary support, it will
>> be useful for the driver further evolution and for the users
>> having multi-channel DWGMAC v3.x devices.
>>
>> Signed-off-by: Yanteng Si <siyanteng@...ngson.cn>
>> Signed-off-by: Feiyang Chen <chenfeiyang@...ngson.cn>
>> Signed-off-by: Yinggang Gu <guyinggang@...ngson.cn>
>> ---
>> .../net/ethernet/stmicro/stmmac/dwmac-sun8i.c | 2 +-
>> .../ethernet/stmicro/stmmac/dwmac1000_dma.c | 36 ++++++++++---------
>> .../net/ethernet/stmicro/stmmac/dwmac_dma.h | 19 +++++++++-
>> .../net/ethernet/stmicro/stmmac/dwmac_lib.c | 32 ++++++++---------
>> drivers/net/ethernet/stmicro/stmmac/hwif.h | 2 +-
>> .../net/ethernet/stmicro/stmmac/stmmac_main.c | 6 ++--
>> 6 files changed, 58 insertions(+), 39 deletions(-)
>>
>> diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-sun8i.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-sun8i.c
>> index 137741b94122..7cdfa0bdb93a 100644
>> --- a/drivers/net/ethernet/stmicro/stmmac/dwmac-sun8i.c
>> +++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-sun8i.c
>> @@ -395,7 +395,7 @@ static void sun8i_dwmac_dma_start_tx(struct stmmac_priv *priv,
>> writel(v, ioaddr + EMAC_TX_CTL1);
>> }
>>
>> -static void sun8i_dwmac_enable_dma_transmission(void __iomem *ioaddr)
>> +static void sun8i_dwmac_enable_dma_transmission(void __iomem *ioaddr, u32 chan)
>> {
>> u32 v;
>>
>> diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac1000_dma.c b/drivers/net/ethernet/stmicro/stmmac/dwmac1000_dma.c
>> index daf79cdbd3ec..5f7b82ad3ec2 100644
>> --- a/drivers/net/ethernet/stmicro/stmmac/dwmac1000_dma.c
>> +++ b/drivers/net/ethernet/stmicro/stmmac/dwmac1000_dma.c
>> @@ -70,15 +70,18 @@ static void dwmac1000_dma_axi(void __iomem *ioaddr, struct stmmac_axi *axi)
>> writel(value, ioaddr + DMA_AXI_BUS_MODE);
>> }
>>
>> -static void dwmac1000_dma_init(void __iomem *ioaddr,
>> - struct stmmac_dma_cfg *dma_cfg, int atds)
>> +static void dwmac1000_dma_init_channel(struct stmmac_priv *priv,
>> + void __iomem *ioaddr,
>> + struct stmmac_dma_cfg *dma_cfg, u32 chan)
>> {
>> - u32 value = readl(ioaddr + DMA_BUS_MODE);
>> + u32 value;
>> int txpbl = dma_cfg->txpbl ?: dma_cfg->pbl;
>> int rxpbl = dma_cfg->rxpbl ?: dma_cfg->pbl;
> Reverse xmas tree please.
OK!
>
>>
>> - /*
>> - * Set the DMA PBL (Programmable Burst Length) mode.
>> + /* common channel control register config */
> Redundant comment. Please drop.
OK!
>
>> + value = readl(ioaddr + DMA_CHAN_BUS_MODE(chan));
>> +
>> + /* Set the DMA PBL (Programmable Burst Length) mode.
>> *
>> * Note: before stmmac core 3.50 this mode bit was 4xPBL, and
>> * post 3.5 mode bit acts as 8*PBL.
>> @@ -98,16 +101,15 @@ static void dwmac1000_dma_init(void __iomem *ioaddr,
>> if (dma_cfg->mixed_burst)
>> value |= DMA_BUS_MODE_MB;
>>
>> - if (atds)
>> - value |= DMA_BUS_MODE_ATDS;
>> + value |= DMA_BUS_MODE_ATDS;
> No, just convert the stmmac_dma_ops.dma_init_channel() to accepting
> the atds flag as I suggested in v7:
> https://lore.kernel.org/netdev/vxcfrxtbfu4pya56m22icnizsyjzqqha5blzb7zpexqcur56uh@uv6vsjf77npa/
>
> In order to simplify this patch you can provide the
> stmmac_dma_ops.dma_init_channel() and
> stmmac_dma_ops.enable_dma_transmission() prototype updates in a
> pre-requisite/preparation patch.
OK.
>
>>
>> if (dma_cfg->aal)
>> value |= DMA_BUS_MODE_AAL;
>>
>> - writel(value, ioaddr + DMA_BUS_MODE);
>> + writel(value, ioaddr + DMA_CHAN_BUS_MODE(chan));
>>
>> /* Mask interrupts by writing to CSR7 */
>> - writel(DMA_INTR_DEFAULT_MASK, ioaddr + DMA_INTR_ENA);
>> + writel(DMA_INTR_DEFAULT_MASK, ioaddr + DMA_CHAN_INTR_ENA(chan));
>> }
>>
>> static void dwmac1000_dma_init_rx(struct stmmac_priv *priv,
>> @@ -116,7 +118,7 @@ static void dwmac1000_dma_init_rx(struct stmmac_priv *priv,
>> dma_addr_t dma_rx_phy, u32 chan)
>> {
>> /* RX descriptor base address list must be written into DMA CSR3 */
>> - writel(lower_32_bits(dma_rx_phy), ioaddr + DMA_RCV_BASE_ADDR);
>> + writel(lower_32_bits(dma_rx_phy), ioaddr + DMA_CHAN_RCV_BASE_ADDR(chan));
>> }
>>
>> static void dwmac1000_dma_init_tx(struct stmmac_priv *priv,
>> @@ -125,7 +127,7 @@ static void dwmac1000_dma_init_tx(struct stmmac_priv *priv,
>> dma_addr_t dma_tx_phy, u32 chan)
>> {
>> /* TX descriptor base address list must be written into DMA CSR4 */
>> - writel(lower_32_bits(dma_tx_phy), ioaddr + DMA_TX_BASE_ADDR);
>> + writel(lower_32_bits(dma_tx_phy), ioaddr + DMA_CHAN_TX_BASE_ADDR(chan));
>> }
>>
>> static u32 dwmac1000_configure_fc(u32 csr6, int rxfifosz)
>> @@ -153,7 +155,7 @@ static void dwmac1000_dma_operation_mode_rx(struct stmmac_priv *priv,
>> void __iomem *ioaddr, int mode,
>> u32 channel, int fifosz, u8 qmode)
>> {
>> - u32 csr6 = readl(ioaddr + DMA_CONTROL);
>> + u32 csr6 = readl(ioaddr + DMA_CHAN_CONTROL(channel));
>>
>> if (mode == SF_DMA_MODE) {
>> pr_debug("GMAC: enable RX store and forward mode\n");
>> @@ -175,14 +177,14 @@ static void dwmac1000_dma_operation_mode_rx(struct stmmac_priv *priv,
>> /* Configure flow control based on rx fifo size */
>> csr6 = dwmac1000_configure_fc(csr6, fifosz);
>>
>> - writel(csr6, ioaddr + DMA_CONTROL);
>> + writel(csr6, ioaddr + DMA_CHAN_CONTROL(channel));
>> }
>>
>> static void dwmac1000_dma_operation_mode_tx(struct stmmac_priv *priv,
>> void __iomem *ioaddr, int mode,
>> u32 channel, int fifosz, u8 qmode)
>> {
>> - u32 csr6 = readl(ioaddr + DMA_CONTROL);
>> + u32 csr6 = readl(ioaddr + DMA_CHAN_CONTROL(channel));
>>
>> if (mode == SF_DMA_MODE) {
>> pr_debug("GMAC: enable TX store and forward mode\n");
>> @@ -209,7 +211,7 @@ static void dwmac1000_dma_operation_mode_tx(struct stmmac_priv *priv,
>> csr6 |= DMA_CONTROL_TTC_256;
>> }
>>
>> - writel(csr6, ioaddr + DMA_CONTROL);
>> + writel(csr6, ioaddr + DMA_CHAN_CONTROL(channel));
>> }
>>
>> static void dwmac1000_dump_dma_regs(struct stmmac_priv *priv,
>> @@ -271,12 +273,12 @@ static int dwmac1000_get_hw_feature(void __iomem *ioaddr,
>> static void dwmac1000_rx_watchdog(struct stmmac_priv *priv,
>> void __iomem *ioaddr, u32 riwt, u32 queue)
>> {
>> - writel(riwt, ioaddr + DMA_RX_WATCHDOG);
>> + writel(riwt, ioaddr + DMA_CHAN_RX_WATCHDOG(queue));
>> }
>>
>> const struct stmmac_dma_ops dwmac1000_dma_ops = {
>> .reset = dwmac_dma_reset,
>> - .init = dwmac1000_dma_init,
>> + .init_chan = dwmac1000_dma_init_channel,
>> .init_rx_chan = dwmac1000_dma_init_rx,
>> .init_tx_chan = dwmac1000_dma_init_tx,
>> .axi = dwmac1000_dma_axi,
>> diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac_dma.h b/drivers/net/ethernet/stmicro/stmmac/dwmac_dma.h
>> index 72672391675f..593be79c46e1 100644
>> --- a/drivers/net/ethernet/stmicro/stmmac/dwmac_dma.h
>> +++ b/drivers/net/ethernet/stmicro/stmmac/dwmac_dma.h
>> @@ -148,11 +148,14 @@
>> DMA_STATUS_TI | \
>> DMA_STATUS_MSK_COMMON)
>>
>> +/* Following DMA defines are chanels oriented */ \
>> +#define DMA_CHAN_OFFSET 0x100 |-------------+
>> + / |
> |
> Please move all of these ---------------------------------------------+-------------------------+
> to being defined just below the DMA_MISSED_FRAME_CTR macros definition. |
> The point is to keep a coherency between dwmac_dma.h and dwmac4_dma.h. |
> The later header file has first generic DMA-related macros defined |
> (CSR addresses and flags) and then the channel-specific ones (CSR |
> addresses and flags). Since in case of the DW GMAC v3.x the |
> multi-channels are implemented as a copy of all the DMA CSRs let's |
> preserve the logic of having all CSR address defined first, then the |
> CSR flags. |
> |
>> #define NUM_DWMAC100_DMA_REGS 9 |
>> #define NUM_DWMAC1000_DMA_REGS 23 |
>> #define NUM_DWMAC4_DMA_REGS 27 |
>> |
>> -void dwmac_enable_dma_transmission(void __iomem *ioaddr); |
>> +void dwmac_enable_dma_transmission(void __iomem *ioaddr, u32 chan); |
>> void dwmac_enable_dma_irq(struct stmmac_priv *priv, void __iomem *ioaddr, |
>> u32 chan, bool rx, bool tx); |
>> void dwmac_disable_dma_irq(struct stmmac_priv *priv, void __iomem *ioaddr, |
>> @@ -169,4 +172,18 @@ int dwmac_dma_interrupt(struct stmmac_priv *priv, void __iomem *ioaddr, |
>> struct stmmac_extra_stats *x, u32 chan, u32 dir); |
>> int dwmac_dma_reset(void __iomem *ioaddr); |
>> |
> |
>> +static inline u32 dma_chan_base_addr(u32 base, u32 chan) \ |
>> +{ | |
>> + return base + chan * DMA_CHAN_OFFSET; | |
>> +} | |
>> + | |
>> +#define DMA_CHAN_XMT_POLL_DEMAND(chan) dma_chan_base_addr(DMA_XMT_POLL_DEMAND, chan) | |
>> +#define DMA_CHAN_INTR_ENA(chan) dma_chan_base_addr(DMA_INTR_ENA, chan) | |
>> +#define DMA_CHAN_CONTROL(chan) dma_chan_base_addr(DMA_CONTROL, chan) | |
>> +#define DMA_CHAN_STATUS(chan) dma_chan_base_addr(DMA_STATUS, chan) |-+
>> +#define DMA_CHAN_BUS_MODE(chan) dma_chan_base_addr(DMA_BUS_MODE, chan) |
>> +#define DMA_CHAN_RCV_BASE_ADDR(chan) dma_chan_base_addr(DMA_RCV_BASE_ADDR, chan) |
>> +#define DMA_CHAN_TX_BASE_ADDR(chan) dma_chan_base_addr(DMA_TX_BASE_ADDR, chan) |
>> +#define DMA_CHAN_RX_WATCHDOG(chan) dma_chan_base_addr(DMA_RX_WATCHDOG, chan) |
>> + /
OK.
>> #endif /* __DWMAC_DMA_H__ */
>> diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac_lib.c b/drivers/net/ethernet/stmicro/stmmac/dwmac_lib.c
>> index 7907d62d3437..b37368137810 100644
>> --- a/drivers/net/ethernet/stmicro/stmmac/dwmac_lib.c
>> +++ b/drivers/net/ethernet/stmicro/stmmac/dwmac_lib.c
>> @@ -28,65 +28,65 @@ int dwmac_dma_reset(void __iomem *ioaddr)
>> }
>>
>> /* CSR1 enables the transmit DMA to check for new descriptor */
>> -void dwmac_enable_dma_transmission(void __iomem *ioaddr)
>> +void dwmac_enable_dma_transmission(void __iomem *ioaddr, u32 chan)
>> {
>> - writel(1, ioaddr + DMA_XMT_POLL_DEMAND);
>> + writel(1, ioaddr + DMA_CHAN_XMT_POLL_DEMAND(chan));
>> }
>>
>> void dwmac_enable_dma_irq(struct stmmac_priv *priv, void __iomem *ioaddr,
>> u32 chan, bool rx, bool tx)
>> {
>> - u32 value = readl(ioaddr + DMA_INTR_ENA);
>> + u32 value = readl(ioaddr + DMA_CHAN_INTR_ENA(chan));
>>
>> if (rx)
>> value |= DMA_INTR_DEFAULT_RX;
>> if (tx)
>> value |= DMA_INTR_DEFAULT_TX;
>>
>> - writel(value, ioaddr + DMA_INTR_ENA);
>> + writel(value, ioaddr + DMA_CHAN_INTR_ENA(chan));
>> }
>>
>> void dwmac_disable_dma_irq(struct stmmac_priv *priv, void __iomem *ioaddr,
>> u32 chan, bool rx, bool tx)
>> {
>> - u32 value = readl(ioaddr + DMA_INTR_ENA);
>> + u32 value = readl(ioaddr + DMA_CHAN_INTR_ENA(chan));
>>
>> if (rx)
>> value &= ~DMA_INTR_DEFAULT_RX;
>> if (tx)
>> value &= ~DMA_INTR_DEFAULT_TX;
>>
>> - writel(value, ioaddr + DMA_INTR_ENA);
>> + writel(value, ioaddr + DMA_CHAN_INTR_ENA(chan));
>> }
>>
>> void dwmac_dma_start_tx(struct stmmac_priv *priv, void __iomem *ioaddr,
>> u32 chan)
>> {
>> - u32 value = readl(ioaddr + DMA_CONTROL);
>> + u32 value = readl(ioaddr + DMA_CHAN_CONTROL(chan));
>> value |= DMA_CONTROL_ST;
>> - writel(value, ioaddr + DMA_CONTROL);
>> + writel(value, ioaddr + DMA_CHAN_CONTROL(chan));
>> }
>>
>> void dwmac_dma_stop_tx(struct stmmac_priv *priv, void __iomem *ioaddr, u32 chan)
>> {
>> - u32 value = readl(ioaddr + DMA_CONTROL);
>> + u32 value = readl(ioaddr + DMA_CHAN_CONTROL(chan));
>> value &= ~DMA_CONTROL_ST;
>> - writel(value, ioaddr + DMA_CONTROL);
>> + writel(value, ioaddr + DMA_CHAN_CONTROL(chan));
>> }
>>
>> void dwmac_dma_start_rx(struct stmmac_priv *priv, void __iomem *ioaddr,
>> u32 chan)
>> {
>> - u32 value = readl(ioaddr + DMA_CONTROL);
>> + u32 value = readl(ioaddr + DMA_CHAN_CONTROL(chan));
>> value |= DMA_CONTROL_SR;
>> - writel(value, ioaddr + DMA_CONTROL);
>> + writel(value, ioaddr + DMA_CHAN_CONTROL(chan));
>> }
>>
>> void dwmac_dma_stop_rx(struct stmmac_priv *priv, void __iomem *ioaddr, u32 chan)
>> {
>> - u32 value = readl(ioaddr + DMA_CONTROL);
>> + u32 value = readl(ioaddr + DMA_CHAN_CONTROL(chan));
>> value &= ~DMA_CONTROL_SR;
>> - writel(value, ioaddr + DMA_CONTROL);
>> + writel(value, ioaddr + DMA_CHAN_CONTROL(chan));
>> }
>>
>> #ifdef DWMAC_DMA_DEBUG
>> @@ -166,7 +166,7 @@ int dwmac_dma_interrupt(struct stmmac_priv *priv, void __iomem *ioaddr,
>> struct stmmac_txq_stats *txq_stats = &priv->xstats.txq_stats[chan];
>> int ret = 0;
>> /* read the status register (CSR5) */
>> - u32 intr_status = readl(ioaddr + DMA_STATUS);
>> + u32 intr_status = readl(ioaddr + DMA_CHAN_STATUS(chan));
>>
>> #ifdef DWMAC_DMA_DEBUG
>> /* Enable it to monitor DMA rx/tx status in case of critical problems */
>> @@ -236,7 +236,7 @@ int dwmac_dma_interrupt(struct stmmac_priv *priv, void __iomem *ioaddr,
>> pr_warn("%s: unexpected status %08x\n", __func__, intr_status);
>>
>> /* Clear the interrupt by writing a logic 1 to the CSR5[15-0] */
>> - writel((intr_status & 0x1ffff), ioaddr + DMA_STATUS);
>> + writel((intr_status & 0x7ffff), ioaddr + DMA_CHAN_STATUS(chan));
> Isn't the mask change going to be implemented in the framework of the
> Loongson-specific DMA-interrupt handler in some of the further patches?
Yes!
>
> I'll get back to reviewing the series tomorrow (later today)...
OK, Thanks for your review! I have read all your comments in others patch.
I will modify the code as soon as possible according to your comments,
but in the next two weeks (Spring Festival), I will not be able to test
on all devices.
Thanks,
Yanteng
>
> -Serge(y)
>
>>
>> return ret;
>> }
>> diff --git a/drivers/net/ethernet/stmicro/stmmac/hwif.h b/drivers/net/ethernet/stmicro/stmmac/hwif.h
>> index 7be04b54738b..b0db38396171 100644
>> --- a/drivers/net/ethernet/stmicro/stmmac/hwif.h
>> +++ b/drivers/net/ethernet/stmicro/stmmac/hwif.h
>> @@ -198,7 +198,7 @@ struct stmmac_dma_ops {
>> /* To track extra statistic (if supported) */
>> void (*dma_diagnostic_fr)(struct stmmac_extra_stats *x,
>> void __iomem *ioaddr);
>> - void (*enable_dma_transmission) (void __iomem *ioaddr);
>> + void (*enable_dma_transmission)(void __iomem *ioaddr, u32 chan);
>> void (*enable_dma_irq)(struct stmmac_priv *priv, void __iomem *ioaddr,
>> u32 chan, bool rx, bool tx);
>> void (*disable_dma_irq)(struct stmmac_priv *priv, void __iomem *ioaddr,
>> diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
>> index b334eb16da23..5617b40abbe4 100644
>> --- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
>> +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
>> @@ -2558,7 +2558,7 @@ static bool stmmac_xdp_xmit_zc(struct stmmac_priv *priv, u32 queue, u32 budget)
>> true, priv->mode, true, true,
>> xdp_desc.len);
>>
>> - stmmac_enable_dma_transmission(priv, priv->ioaddr);
>> + stmmac_enable_dma_transmission(priv, priv->ioaddr, queue);
>>
>> xsk_tx_metadata_to_compl(meta,
>> &tx_q->tx_skbuff_dma[entry].xsk_meta);
>> @@ -4706,7 +4706,7 @@ static netdev_tx_t stmmac_xmit(struct sk_buff *skb, struct net_device *dev)
>>
>> netdev_tx_sent_queue(netdev_get_tx_queue(dev, queue), skb->len);
>>
>> - stmmac_enable_dma_transmission(priv, priv->ioaddr);
>> + stmmac_enable_dma_transmission(priv, priv->ioaddr, queue);
>>
>> stmmac_flush_tx_descriptors(priv, queue);
>> stmmac_tx_timer_arm(priv, queue);
>> @@ -4926,7 +4926,7 @@ static int stmmac_xdp_xmit_xdpf(struct stmmac_priv *priv, int queue,
>> u64_stats_update_end_irqrestore(&txq_stats->syncp, flags);
>> }
>>
>> - stmmac_enable_dma_transmission(priv, priv->ioaddr);
>> + stmmac_enable_dma_transmission(priv, priv->ioaddr, queue);
>>
>> entry = STMMAC_GET_ENTRY(entry, priv->dma_conf.dma_tx_size);
>> tx_q->cur_tx = entry;
>> --
>> 2.31.4
>>
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