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Message-ID: <5547C23B.2080509@ni.com>
Date: Mon, 04 May 2015 14:02:19 -0500
From: Jaeden Amero <jaeden.amero@...com>
To: Harini Katakam <harini.katakam@...inx.com>,
nicolas.ferre@...el.com, davem@...emloft.net, robh+dt@...nel.org,
pawel.moll@....com, mark.rutland@....com,
ijc+devicetree@...lion.org.uk, galak@...eaurora.org,
boris.brezillon@...e-electrons.com,
alexandre.belloni@...e-electrons.com, harinikatakamlinux@...il.com
CC: netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
devicetree@...r.kernel.org, harinik@...inx.com, punnaia@...inx.com,
michals@...inx.com
Subject: Re: [net-next PATCH v2 2/3] net: macb: Add support for jumbo frames
On 05/04/2015 02:52 AM, Harini Katakam wrote:
> Check for "cdns,zynqmp-gem" compatible string and enable jumbo frame support
> in NWCFG register, update descriptor length masks and registers accordingly.
> Jumbo max length register should be set according to support in SoC; it is
> set to 10240 for Zynq Ultrascale+ MPSoC.
>
> Signed-off-by: Harini Katakam <harinik@...inx.com>
> Reviewed-by: Punnaiah Choudary Kalluri <punnaia@...inx.com>
> ---
>
> On v1, Michal commented that I should use macb_config for jumbo parameters
> instead of defining them by reading the compatible string directly.
> I can use .caps for isjumbo. But jumbo-max-length needs to be defined.
> Can I add this to the structure? Any suggestions on how to handle this?
>
> v2:
> Add constant definition and update SoC name
>
> ---
> drivers/net/ethernet/cadence/macb.c | 21 ++++++++++++++++++---
> drivers/net/ethernet/cadence/macb.h | 8 ++++++++
> 2 files changed, 26 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/net/ethernet/cadence/macb.c b/drivers/net/ethernet/cadence/macb.c
> index 4104d49..a065283 100644
> --- a/drivers/net/ethernet/cadence/macb.c
> +++ b/drivers/net/ethernet/cadence/macb.c
> @@ -54,6 +54,8 @@
> #define MACB_MAX_TX_LEN ((unsigned int)((1 << MACB_TX_FRMLEN_SIZE) - 1))
> #define GEM_MAX_TX_LEN ((unsigned int)((1 << GEM_TX_FRMLEN_SIZE) - 1))
>
> +#define GEM_ZYNQMP_JUMBO_MAX 10240
> +
> /*
> * Graceful stop timeouts in us. We should allow up to
> * 1 frame time (10 Mbits/s, full-duplex, ignoring collisions)
> @@ -782,7 +784,7 @@ static int gem_rx(struct macb *bp, int budget)
> }
> /* now everything is ready for receiving packet */
> bp->rx_skbuff[entry] = NULL;
> - len = MACB_BFEXT(RX_FRMLEN, ctrl);
> + len = ctrl & bp->rx_frm_len_mask;
>
> netdev_vdbg(bp->dev, "gem_rx %u (len %u)\n", entry, len);
>
> @@ -828,7 +830,7 @@ static int macb_rx_frame(struct macb *bp, unsigned int first_frag,
> struct macb_dma_desc *desc;
>
> desc = macb_rx_desc(bp, last_frag);
> - len = MACB_BFEXT(RX_FRMLEN, desc->ctrl);
> + len = desc->ctrl & bp->rx_frm_len_mask;
>
> netdev_vdbg(bp->dev, "macb_rx_frame frags %u - %u (len %u)\n",
> macb_rx_ring_wrap(first_frag),
> @@ -1633,7 +1635,10 @@ static void macb_init_hw(struct macb *bp)
> config |= MACB_BF(RBOF, NET_IP_ALIGN); /* Make eth data aligned */
> config |= MACB_BIT(PAE); /* PAuse Enable */
> config |= MACB_BIT(DRFCS); /* Discard Rx FCS */
> - config |= MACB_BIT(BIG); /* Receive oversized frames */
> + if (bp->isjumbo)
> + config |= MACB_BIT(JFRAME); /* Enable jumbo frames */
> + else
> + config |= MACB_BIT(BIG); /* Receive oversized frames */
> if (bp->dev->flags & IFF_PROMISC)
> config |= MACB_BIT(CAF); /* Copy All Frames */
> else if (macb_is_gem(bp) && bp->dev->features & NETIF_F_RXCSUM)
> @@ -1642,8 +1647,13 @@ static void macb_init_hw(struct macb *bp)
> config |= MACB_BIT(NBC); /* No BroadCast */
> config |= macb_dbw(bp);
> macb_writel(bp, NCFGR, config);
> + if (bp->isjumbo && bp->jumbo_max_len)
> + gem_writel(bp, JML, bp->jumbo_max_len);
> bp->speed = SPEED_10;
> bp->duplex = DUPLEX_HALF;
> + bp->rx_frm_len_mask = MACB_RX_FRMLEN_MASK;
> + if (bp->isjumbo)
> + bp->rx_frm_len_mask = MACB_RX_JFRMLEN_MASK;
>
> macb_configure_dma(bp);
>
> @@ -2762,6 +2772,11 @@ static int macb_probe(struct platform_device *pdev)
> bp->pclk = pclk;
> bp->hclk = hclk;
> bp->tx_clk = tx_clk;
> + if (of_device_is_compatible(pdev->dev.of_node, "cdns,zynqmp-gem")) {
> + bp->isjumbo = 1;
> + bp->jumbo_max_len = GEM_ZYNQMP_JUMBO_MAX;
Could you use the bottom 16 bits of DCFG2 instead of GEM_ZYNQMP_JUMBO_MAX?
> + }
> +
> spin_lock_init(&bp->lock);
>
> /* setup capabilities */
> diff --git a/drivers/net/ethernet/cadence/macb.h b/drivers/net/ethernet/cadence/macb.h
> index eb7d76f..e25f77e 100644
> --- a/drivers/net/ethernet/cadence/macb.h
> +++ b/drivers/net/ethernet/cadence/macb.h
> @@ -71,6 +71,7 @@
> #define GEM_NCFGR 0x0004 /* Network Config */
> #define GEM_USRIO 0x000c /* User IO */
> #define GEM_DMACFG 0x0010 /* DMA Configuration */
> +#define GEM_JML 0x0048 /* Jumbo Max Length */
> #define GEM_HRB 0x0080 /* Hash Bottom */
> #define GEM_HRT 0x0084 /* Hash Top */
> #define GEM_SA1B 0x0088 /* Specific1 Bottom */
> @@ -514,6 +515,9 @@ struct macb_dma_desc {
> #define MACB_RX_BROADCAST_OFFSET 31
> #define MACB_RX_BROADCAST_SIZE 1
>
> +#define MACB_RX_FRMLEN_MASK 0xFFF
> +#define MACB_RX_JFRMLEN_MASK 0x3FFF
> +
> /* RX checksum offload disabled: bit 24 clear in NCFGR */
> #define GEM_RX_TYPEID_MATCH_OFFSET 22
> #define GEM_RX_TYPEID_MATCH_SIZE 2
> @@ -826,6 +830,10 @@ struct macb {
> unsigned int max_tx_length;
>
> u64 ethtool_stats[GEM_STATS_LEN];
> +
> + unsigned int rx_frm_len_mask;
> + unsigned int jumbo_max_len;
> + bool isjumbo;
> };
>
> static inline bool macb_is_gem(struct macb *bp)
>
--
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