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Lu, Wenzhuo ; Changchun Ouyang >> ; Zhang, Helin >> Cc: dev@dpdk.org; Wang, Wen ; stable@dpdk.org >> Subject: Re: [PATCH v2 3/7] net/ixgbe: Check that SFF-8472 soft rate select is supported before write >> >> On 12/20/21 02:53, Wang, Haiyue wrote: >>>> -----Original Message----- >>>> From: Stephen Douthit >>>> Sent: Tuesday, December 7, 2021 06:19 >>>> To: Wang, Haiyue ; Lu, Wenzhuo ; Changchun Ouyang >>>> ; Zhang, Helin >>>> Cc: dev@dpdk.org; Wen Wang ; Stephen Douthit ; >>>> stable@dpdk.org >>>> Subject: [PATCH v2 3/7] net/ixgbe: Check that SFF-8472 soft rate select is supported before write >>>> >>>> Make sure an SFP is really a SFF-8472 device that supports the optional >>>> soft rate select feature before just blindly poking those I2C registers. >>>> >>>> Skip all I2C traffic if we know there's no SFP. >>>> >>>> Fixes: f3430431aba ("ixgbe/base: add SFP+ dual-speed support") >>>> Cc: stable@dpdk.org >>>> >>>> Signed-off-by: Stephen Douthit >>>> --- >>> >>> >>>> /* Set RS0 */ >>>> status = hw->phy.ops.read_i2c_byte(hw, IXGBE_SFF_SFF_8472_OSCB, >>>> IXGBE_I2C_EEPROM_DEV_ADDR2, >>>> diff --git a/drivers/net/ixgbe/base/ixgbe_phy.h b/drivers/net/ixgbe/base/ixgbe_phy.h >>>> index ceefbb3e68..cd57ce040f 100644 >>>> --- a/drivers/net/ixgbe/base/ixgbe_phy.h >>>> +++ b/drivers/net/ixgbe/base/ixgbe_phy.h >>>> @@ -21,6 +21,7 @@ >>>> #define IXGBE_SFF_CABLE_TECHNOLOGY 0x8 >>>> #define IXGBE_SFF_CABLE_SPEC_COMP 0x3C >>>> #define IXGBE_SFF_SFF_8472_SWAP 0x5C >>>> +#define IXGBE_SFF_SFF_8472_EOPT 0x5D >>> >>> Looks like this is YOUR platform specific, then this patchset can't be >>> merged. : - ( >> >> This isn't anything unique to our hardware, these values are coming from >> the SFF-8472 SFP+ I2C specification. >> >> The ability to do a soft rate select via I2C is an optional feature, and >> modules that support it are supposed to set bit 3 in byte 93 (0x5d), the >> "Enhanced Options" register, to advertise the functionality. >> >> Please see section 8.10 and Table 8-6 in the SFF-8472 spec. >> >> Checking the RATE_SELECT bit flag may be overkill since the transceiver >> is supposed to ignore writes to rate select control bits if the feature >> isn't implemented. I can drop that check if you like, but the other >> checks for a 8472 device (vs 8079) aren't anything different than what >> already happens in the driver elsewhere[1]. I'd argue that testing that >> a feature is supported in hardware before trying to use it is normal >> driver behavior. >> >> If instead you mean that the entire series is somehow applicable only to >> our hardware, I'm not sure why. >> >> That hotplug issue isn't seen on the same hardware when using the Linux >> driver; so it's a dpdk problem (at least on C3000 ixgbe devs), and not a > > I can't find your related fix in two official Linux drivers: There's no submission from me on the hotplug issue for the mainline, because the issue isn't present in Linux, only in DPDK. > https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/drivers/net/ethernet/intel/ixgbe > https://www.intel.com/content/www/us/en/download/14302/14687/intel-network-adapter-driver-for-pcie-intel-10-gigabit-ethernet-network-connections-under-linux.html? > > Normally, DPDK keeps sync with this kind of release. > >> hardware problem. Fixing the hotplug/rateswap issue was my primary >> goal, the other patches fix problems I found along the way while >> debugging. >> >> I can also reproduce the hotplug/rateswap issue on the PLCC-B, an Intel >> reference design for the C3000 family, so again, not unique to this >> platform. > > I guess this is just in C3000 reference board SDK ? It's the board covered by Intel Doc # 574437. > I recommend you submit the fix to kernel firstly, you will get more > experts' reviews and fully test: Since patch 3 isn't directly related to the hotplug issue should I pull it from the series for v3 to keep the hotplug fixes moving forward here, and in parallel submit just that one to Linux? Thanks, Steve > https://patchwork.ozlabs.org/project/intel-wired-lan/list/ > https://lists.osuosl.org/mailman/listinfo/intel-wired-lan > >> >> Please let me know if that addresses your concerns, or if I've missed >> your point. >> > > > > > >> Thanks, >> Steve >> >> [1] >> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/drivers/net/ethernet/intel/ixg >> be/ixgbe_ethtool.c?h=v5.16-rc6 >> >>>> #define IXGBE_SFF_SFF_8472_COMP 0x5E >>>> #define IXGBE_SFF_SFF_8472_OSCB 0x6E >>>> #define IXGBE_SFF_SFF_8472_ESCB 0x76 >>>> @@ -48,6 +49,8 @@ >>>> #define IXGBE_SFF_SOFT_RS_SELECT_10G 0x8 >>>> -- >>>> 2.31.1 >>> >