Re: [v7, PATCH] net: stmmac: add support for hash table size 128/256 in dwmac4

From: biao huang
Date: Fri Jun 21 2019 - 05:15:27 EST

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Dear David, Jose,

any comments about this patch?

Thanks
Biao

On Thu, 2019-05-30 at 17:30 +0800, Biao Huang wrote:
> 1. get hash table size in hw feature reigster, and add support
> for taller hash table(128/256) in dwmac4.
> 2. only clear GMAC_PACKET_FILTER bits used in this function,
> to avoid side effect to functions of other bits.
>
> stmmac selftests output log with flow control on:
> ethtool -t eth0
> The test result is PASS
> The test extra info:
> 1. MAC Loopback 0
> 2. PHY Loopback -95
> 3. MMC Counters 0
> 4. EEE -95
> 5. Hash Filter MC 0
> 6. Perfect Filter UC 0
> 7. MC Filter 0
> 8. UC Filter 0
> 9. Flow Control 0
>
> Signed-off-by: Biao Huang <biao.huang@xxxxxxxxxxxx>
> ---
> drivers/net/ethernet/stmicro/stmmac/common.h | 7 +--
> drivers/net/ethernet/stmicro/stmmac/dwmac4.h | 4 +-
> drivers/net/ethernet/stmicro/stmmac/dwmac4_core.c | 49 ++++++++++++---------
> drivers/net/ethernet/stmicro/stmmac/dwmac4_dma.c | 1 +
> drivers/net/ethernet/stmicro/stmmac/stmmac_main.c | 6 +++
> 5 files changed, 42 insertions(+), 25 deletions(-)
>
> diff --git a/drivers/net/ethernet/stmicro/stmmac/common.h b/drivers/net/ethernet/stmicro/stmmac/common.h
> index 1961fe9..26bbcd8 100644
> --- a/drivers/net/ethernet/stmicro/stmmac/common.h
> +++ b/drivers/net/ethernet/stmicro/stmmac/common.h
> @@ -335,6 +335,7 @@ struct dma_features {
> /* 802.3az - Energy-Efficient Ethernet (EEE) */
> unsigned int eee;
> unsigned int av;
> + unsigned int hash_tb_sz;
> unsigned int tsoen;
> /* TX and RX csum */
> unsigned int tx_coe;
> @@ -428,9 +429,9 @@ struct mac_device_info {
> struct mii_regs mii; /* MII register Addresses */
> struct mac_link link;
> void __iomem *pcsr; /* vpointer to device CSRs */
> - int multicast_filter_bins;
> - int unicast_filter_entries;
> - int mcast_bits_log2;
> + unsigned int multicast_filter_bins;
> + unsigned int unicast_filter_entries;
> + unsigned int mcast_bits_log2;
> unsigned int rx_csum;
> unsigned int pcs;
> unsigned int pmt;
> diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac4.h b/drivers/net/ethernet/stmicro/stmmac/dwmac4.h
> index 01c1089..b68785f7 100644
> --- a/drivers/net/ethernet/stmicro/stmmac/dwmac4.h
> +++ b/drivers/net/ethernet/stmicro/stmmac/dwmac4.h
> @@ -18,8 +18,7 @@
> /* MAC registers */
> #define GMAC_CONFIG 0x00000000
> #define GMAC_PACKET_FILTER 0x00000008
> -#define GMAC_HASH_TAB_0_31 0x00000010
> -#define GMAC_HASH_TAB_32_63 0x00000014
> +#define GMAC_HASH_TAB(x) (0x10 + (x) * 4)
> #define GMAC_RX_FLOW_CTRL 0x00000090
> #define GMAC_QX_TX_FLOW_CTRL(x) (0x70 + x * 4)
> #define GMAC_TXQ_PRTY_MAP0 0x98
> @@ -184,6 +183,7 @@ enum power_event {
> #define GMAC_HW_FEAT_MIISEL BIT(0)
>
> /* MAC HW features1 bitmap */
> +#define GMAC_HW_HASH_TB_SZ GENMASK(25, 24)
> #define GMAC_HW_FEAT_AVSEL BIT(20)
> #define GMAC_HW_TSOEN BIT(18)
> #define GMAC_HW_TXFIFOSIZE GENMASK(10, 6)
> diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac4_core.c b/drivers/net/ethernet/stmicro/stmmac/dwmac4_core.c
> index 5e98da4..4183607 100644
> --- a/drivers/net/ethernet/stmicro/stmmac/dwmac4_core.c
> +++ b/drivers/net/ethernet/stmicro/stmmac/dwmac4_core.c
> @@ -403,41 +403,50 @@ static void dwmac4_set_filter(struct mac_device_info *hw,
> struct net_device *dev)
> {
> void __iomem *ioaddr = (void __iomem *)dev->base_addr;
> - unsigned int value = 0;
> + int numhashregs = (hw->multicast_filter_bins >> 5);
> + int mcbitslog2 = hw->mcast_bits_log2;
> + unsigned int value;
> + int i;
>
> + value = readl(ioaddr + GMAC_PACKET_FILTER);
> + value &= ~GMAC_PACKET_FILTER_HMC;
> + value &= ~GMAC_PACKET_FILTER_HPF;
> + value &= ~GMAC_PACKET_FILTER_PCF;
> + value &= ~GMAC_PACKET_FILTER_PM;
> + value &= ~GMAC_PACKET_FILTER_PR;
> if (dev->flags & IFF_PROMISC) {
> value = GMAC_PACKET_FILTER_PR | GMAC_PACKET_FILTER_PCF;
> } else if ((dev->flags & IFF_ALLMULTI) ||
> - (netdev_mc_count(dev) > HASH_TABLE_SIZE)) {
> + (netdev_mc_count(dev) > hw->multicast_filter_bins)) {
> /* Pass all multi */
> - value = GMAC_PACKET_FILTER_PM;
> - /* Set the 64 bits of the HASH tab. To be updated if taller
> - * hash table is used
> - */
> - writel(0xffffffff, ioaddr + GMAC_HASH_TAB_0_31);
> - writel(0xffffffff, ioaddr + GMAC_HASH_TAB_32_63);
> + value |= GMAC_PACKET_FILTER_PM;
> + /* Set all the bits of the HASH tab */
> + for (i = 0; i < numhashregs; i++)
> + writel(0xffffffff, ioaddr + GMAC_HASH_TAB(i));
> } else if (!netdev_mc_empty(dev)) {
> - u32 mc_filter[2];
> struct netdev_hw_addr *ha;
> + u32 mc_filter[8];
>
> /* Hash filter for multicast */
> - value = GMAC_PACKET_FILTER_HMC;
> + value |= GMAC_PACKET_FILTER_HMC;
>
> memset(mc_filter, 0, sizeof(mc_filter));
> netdev_for_each_mc_addr(ha, dev) {
> - /* The upper 6 bits of the calculated CRC are used to
> - * index the content of the Hash Table Reg 0 and 1.
> + /* The upper n bits of the calculated CRC are used to
> + * index the contents of the hash table. The number of
> + * bits used depends on the hardware configuration
> + * selected at core configuration time.
> */
> - int bit_nr =
> - (bitrev32(~crc32_le(~0, ha->addr, 6)) >> 26);
> - /* The most significant bit determines the register
> - * to use while the other 5 bits determines the bit
> - * within the selected register
> + int bit_nr = bitrev32(~crc32_le(~0, ha->addr,
> + ETH_ALEN)) >> (32 - mcbitslog2);
> + /* The most significant bit determines the register to
> + * use (H/L) while the other 5 bits determine the bit
> + * within the register.
> */
> - mc_filter[bit_nr >> 5] |= (1 << (bit_nr & 0x1F));
> + mc_filter[bit_nr >> 5] |= (1 << (bit_nr & 0x1f));
> }
> - writel(mc_filter[0], ioaddr + GMAC_HASH_TAB_0_31);
> - writel(mc_filter[1], ioaddr + GMAC_HASH_TAB_32_63);
> + for (i = 0; i < numhashregs; i++)
> + writel(mc_filter[i], ioaddr + GMAC_HASH_TAB(i));
> }
>
> value |= GMAC_PACKET_FILTER_HPF;
> diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac4_dma.c b/drivers/net/ethernet/stmicro/stmmac/dwmac4_dma.c
> index edb6053..59afb53 100644
> --- a/drivers/net/ethernet/stmicro/stmmac/dwmac4_dma.c
> +++ b/drivers/net/ethernet/stmicro/stmmac/dwmac4_dma.c
> @@ -354,6 +354,7 @@ static void dwmac4_get_hw_feature(void __iomem *ioaddr,
>
> /* MAC HW feature1 */
> hw_cap = readl(ioaddr + GMAC_HW_FEATURE1);
> + dma_cap->hash_tb_sz = (hw_cap & GMAC_HW_HASH_TB_SZ) >> 24;
> dma_cap->av = (hw_cap & GMAC_HW_FEAT_AVSEL) >> 20;
> dma_cap->tsoen = (hw_cap & GMAC_HW_TSOEN) >> 18;
> /* RX and TX FIFO sizes are encoded as log2(n / 128). Undo that by
> diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
> index 8fcbf22..f7aac15 100644
> --- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
> +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
> @@ -4166,6 +4166,12 @@ static int stmmac_hw_init(struct stmmac_priv *priv)
> priv->plat->enh_desc = priv->dma_cap.enh_desc;
> priv->plat->pmt = priv->dma_cap.pmt_remote_wake_up;
> priv->hw->pmt = priv->plat->pmt;
> + if (priv->dma_cap.hash_tb_sz) {
> + priv->hw->multicast_filter_bins =
> + (BIT(priv->dma_cap.hash_tb_sz) << 5);
> + priv->hw->mcast_bits_log2 =
> + ilog2(priv->hw->multicast_filter_bins);
> + }
>
> /* TXCOE doesn't work in thresh DMA mode */
> if (priv->plat->force_thresh_dma_mode)

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