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Date: Mon, 4 Dec 2023 14:35:31 +0200
From: Vladimir Oltean <vladimir.oltean@....com>
To: Roger Quadros <rogerq@...nel.org>
Cc: davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
	pabeni@...hat.com, s-vadapalli@...com, r-gunasekaran@...com,
	vigneshr@...com, srk@...com, horms@...nel.org, p-varis@...com,
	netdev@...r.kernel.org
Subject: Re: [PATCH v7 net-next 6/8] net: ethernet: ti: am65-cpsw-qos: Add
 Frame Preemption MAC Merge support

On Fri, Dec 01, 2023 at 03:58:00PM +0200, Roger Quadros wrote:
> Add driver support for viewing / changing the MAC Merge sublayer
> parameters and seeing the verification state machine's current state
> via ethtool.
> 
> As hardware does not support interrupt notification for verification
> events we resort to polling on link up. On link up we try a couple of
> times for verification success and if unsuccessful then give up.
> 
> The Frame Preemption feature is described in the Technical Reference
> Manual [1] in section:
> 	12.3.1.4.6.7 Intersperced Express Traffic (IET – P802.3br/D2.0)
> 
> Due to Silicon Errata i2208 [2] we set limit min IET fragment size to 124.
> 
> [1] AM62x TRM - https://www.ti.com/lit/ug/spruiv7a/spruiv7a.pdf
> [2] AM62x Silicon Errata - https://www.ti.com/lit/er/sprz487c/sprz487c.pdf
> 
> Signed-off-by: Roger Quadros <rogerq@...nel.org>
> ---

Actually...

ld.lld: error: undefined symbol: am65_cpsw_iet_common_enable
>>> referenced by am65-cpsw-ethtool.c:755 (drivers/net/ethernet/ti/am65-cpsw-ethtool.c:755)
>>>               drivers/net/ethernet/ti/am65-cpsw-ethtool.o:(am65_cpsw_set_mm) in archive vmlinux.a

ld.lld: error: undefined symbol: am65_cpsw_iet_commit_preemptible_tcs
>>> referenced by am65-cpsw-ethtool.c:876 (drivers/net/ethernet/ti/am65-cpsw-ethtool.c:876)
>>>               drivers/net/ethernet/ti/am65-cpsw-ethtool.o:(am65_cpsw_set_mm) in archive vmlinux.a

cat $KBUILD_OUTPUT/.config | grep AM65
CONFIG_TI_K3_AM65_CPSW_NUSS=y
# CONFIG_TI_K3_AM65_CPSW_SWITCHDEV is not set
# CONFIG_TI_K3_AM65_CPTS is not set
CONFIG_MMC_SDHCI_AM654=y
CONFIG_PHY_AM654_SERDES=m

am65-cpsw-qos.c is built only if CONFIG_TI_AM65_CPSW_TAS is enabled, yet am65-cpsw-ethtool.c,
built by CONFIG_TI_K3_AM65_CPSW_NUSS, depends on it.

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