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Date: Thu, 10 Aug 2023 14:55:33 +0200
From: Alexandre TORGUE <alexandre.torgue@...s.st.com>
To: Furong Xu <0x1207@...il.com>,
"David S. Miller" <davem@...emloft.net>,
Jose Abreu <joabreu@...opsys.com>,
Eric Dumazet <edumazet@...gle.com>,
Jakub Kicinski <kuba@...nel.org>,
Paolo Abeni <pabeni@...hat.com>,
Maxime Coquelin <mcoquelin.stm32@...il.com>,
Joao Pinto <jpinto@...opsys.com>,
Simon Horman <horms@...nel.org>
CC: <netdev@...r.kernel.org>,
<linux-stm32@...md-mailman.stormreply.com>,
<linux-arm-kernel@...ts.infradead.org>,
<linux-kernel@...r.kernel.org>, <xfr@...look.com>,
<rock.xu@....com>
Subject: Re: [PATCH 1/1] net: stmmac: dwmac4: extract MAC_HW_Feature regs MSB
first
Hi Furong
On 8/10/23 11:59, Furong Xu wrote:
> The bit extraction sequences are a little messy.
> No code changes, just reorder them.
>
> Signed-off-by: Furong Xu <0x1207@...il.com>
> ---
> .../net/ethernet/stmicro/stmmac/dwmac4_dma.c | 54 +++++++++----------
> 1 file changed, 26 insertions(+), 28 deletions(-)
>
> diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac4_dma.c b/drivers/net/ethernet/stmicro/stmmac/dwmac4_dma.c
> index 84d3a8551b03..3d9e20078193 100644
> --- a/drivers/net/ethernet/stmicro/stmmac/dwmac4_dma.c
> +++ b/drivers/net/ethernet/stmicro/stmmac/dwmac4_dma.c
> @@ -379,27 +379,27 @@ static int dwmac4_get_hw_feature(void __iomem *ioaddr,
> {
> u32 hw_cap = readl(ioaddr + GMAC_HW_FEATURE0);
>
> - /* MAC HW feature0 */
Why to not start with the LSB ?
> - dma_cap->mbps_10_100 = (hw_cap & GMAC_HW_FEAT_MIISEL);
> - dma_cap->mbps_1000 = (hw_cap & GMAC_HW_FEAT_GMIISEL) >> 1;
> - dma_cap->half_duplex = (hw_cap & GMAC_HW_FEAT_HDSEL) >> 2;
> - dma_cap->vlhash = (hw_cap & GMAC_HW_FEAT_VLHASH) >> 4;
> + /* MAC HW feature0 */
> + dma_cap->vlins = (hw_cap & GMAC_HW_FEAT_SAVLANINS) >> 27;
> dma_cap->multi_addr = (hw_cap & GMAC_HW_FEAT_ADDMAC) >> 18;
> - dma_cap->pcs = (hw_cap & GMAC_HW_FEAT_PCSSEL) >> 3;
> - dma_cap->sma_mdio = (hw_cap & GMAC_HW_FEAT_SMASEL) >> 5;
> - dma_cap->pmt_remote_wake_up = (hw_cap & GMAC_HW_FEAT_RWKSEL) >> 6;
> - dma_cap->pmt_magic_frame = (hw_cap & GMAC_HW_FEAT_MGKSEL) >> 7;
> - /* MMC */
> - dma_cap->rmon = (hw_cap & GMAC_HW_FEAT_MMCSEL) >> 8;
> - /* IEEE 1588-2008 */
> - dma_cap->atime_stamp = (hw_cap & GMAC_HW_FEAT_TSSEL) >> 12;
> - /* 802.3az - Energy-Efficient Ethernet (EEE) */
> - dma_cap->eee = (hw_cap & GMAC_HW_FEAT_EEESEL) >> 13;
> /* TX and RX csum */
> - dma_cap->tx_coe = (hw_cap & GMAC_HW_FEAT_TXCOSEL) >> 14;
> dma_cap->rx_coe = (hw_cap & GMAC_HW_FEAT_RXCOESEL) >> 16;
> - dma_cap->vlins = (hw_cap & GMAC_HW_FEAT_SAVLANINS) >> 27;
> + dma_cap->tx_coe = (hw_cap & GMAC_HW_FEAT_TXCOSEL) >> 14;
> + /* 802.3az - Energy-Efficient Ethernet (EEE) */
> + dma_cap->eee = (hw_cap & GMAC_HW_FEAT_EEESEL) >> 13;
> + /* IEEE 1588-2008 */
> + dma_cap->atime_stamp = (hw_cap & GMAC_HW_FEAT_TSSEL) >> 12;
> dma_cap->arpoffsel = (hw_cap & GMAC_HW_FEAT_ARPOFFSEL) >> 9;
> + /* MMC */
> + dma_cap->rmon = (hw_cap & GMAC_HW_FEAT_MMCSEL) >> 8;
> + dma_cap->pmt_magic_frame = (hw_cap & GMAC_HW_FEAT_MGKSEL) >> 7;
> + dma_cap->pmt_remote_wake_up = (hw_cap & GMAC_HW_FEAT_RWKSEL) >> 6;
> + dma_cap->sma_mdio = (hw_cap & GMAC_HW_FEAT_SMASEL) >> 5;
> + dma_cap->vlhash = (hw_cap & GMAC_HW_FEAT_VLHASH) >> 4;
> + dma_cap->pcs = (hw_cap & GMAC_HW_FEAT_PCSSEL) >> 3;
> + dma_cap->half_duplex = (hw_cap & GMAC_HW_FEAT_HDSEL) >> 2;
> + dma_cap->mbps_1000 = (hw_cap & GMAC_HW_FEAT_GMIISEL) >> 1;
> + dma_cap->mbps_10_100 = (hw_cap & GMAC_HW_FEAT_MIISEL);
>
> /* MAC HW feature1 */
> hw_cap = readl(ioaddr + GMAC_HW_FEATURE1);
> @@ -408,7 +408,6 @@ static int dwmac4_get_hw_feature(void __iomem *ioaddr,
> dma_cap->av = (hw_cap & GMAC_HW_FEAT_AVSEL) >> 20;
> dma_cap->tsoen = (hw_cap & GMAC_HW_TSOEN) >> 18;
> dma_cap->sphen = (hw_cap & GMAC_HW_FEAT_SPHEN) >> 17;
> -
> dma_cap->addr64 = (hw_cap & GMAC_HW_ADDR64) >> 14;
> switch (dma_cap->addr64) {
> case 0:
> @@ -424,31 +423,30 @@ static int dwmac4_get_hw_feature(void __iomem *ioaddr,
> dma_cap->addr64 = 32;
> break;
> }
> -
> /* RX and TX FIFO sizes are encoded as log2(n / 128). Undo that by
> * shifting and store the sizes in bytes.
> */
> dma_cap->tx_fifo_size = 128 << ((hw_cap & GMAC_HW_TXFIFOSIZE) >> 6);
> dma_cap->rx_fifo_size = 128 << ((hw_cap & GMAC_HW_RXFIFOSIZE) >> 0);
> +
> /* MAC HW feature2 */
> hw_cap = readl(ioaddr + GMAC_HW_FEATURE2);
> + /* Number of Auxiliary Snapshot Inputs */
> + dma_cap->aux_snapshot_n = (hw_cap & GMAC_HW_FEAT_AUXSNAPNUM) >> 28;
> + /* PPS output */
> + dma_cap->pps_out_num = (hw_cap & GMAC_HW_FEAT_PPSOUTNUM) >> 24;
> /* TX and RX number of channels */
> - dma_cap->number_rx_channel =
> - ((hw_cap & GMAC_HW_FEAT_RXCHCNT) >> 12) + 1;
> dma_cap->number_tx_channel =
> ((hw_cap & GMAC_HW_FEAT_TXCHCNT) >> 18) + 1;
> + dma_cap->number_rx_channel =
> + ((hw_cap & GMAC_HW_FEAT_RXCHCNT) >> 12) + 1;
> /* TX and RX number of queues */
> - dma_cap->number_rx_queues =
> - ((hw_cap & GMAC_HW_FEAT_RXQCNT) >> 0) + 1;
> dma_cap->number_tx_queues =
> ((hw_cap & GMAC_HW_FEAT_TXQCNT) >> 6) + 1;
> - /* PPS output */
> - dma_cap->pps_out_num = (hw_cap & GMAC_HW_FEAT_PPSOUTNUM) >> 24;
> -
> + dma_cap->number_rx_queues =
> + ((hw_cap & GMAC_HW_FEAT_RXQCNT) >> 0) + 1;
> /* IEEE 1588-2002 */
> dma_cap->time_stamp = 0;
> - /* Number of Auxiliary Snapshot Inputs */
> - dma_cap->aux_snapshot_n = (hw_cap & GMAC_HW_FEAT_AUXSNAPNUM) >> 28;
>
> /* MAC HW feature3 */
> hw_cap = readl(ioaddr + GMAC_HW_FEATURE3);
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