----- Original Message ----- >Date: Thu, 13 Mar 2008 14:36:06 +0800 >From: Xiu-Yan Wang <[EMAIL PROTECTED]> >Subject: Re: [driver-discuss] EthernetDirver-packet-tcp_mss >To: Masa Murayama <[EMAIL PROTECTED]> >Cc: Andrew Gallatin <[EMAIL PROTECTED]>, driver-discuss@opensolaris.org, > [EMAIL PROTECTED], [EMAIL PROTECTED], > zhenghui xie <[EMAIL PROTECTED]>, [EMAIL PROTECTED] > > >Hi Drew and Masa, > >Does your hardware need partial hardware checksum to be enabled at the >same time to support LSO? That is, the capability of LSO depends on that >of partial hardware checksum?
TCP layer sends both LSO packets and non-LSO packets at the same time. Therefore, I need to set partial cksum flag and LSO, even if the nic doesn't require partial checksum for LSO packets. -masa >Masa Murayama wrote: >> ----- Original Message ----- >>> Xiu-Yan Wang writes: >>>> The reason for my questions is that there're internal requirements to >>>> enhance the implementation of hcksum_retrieve() and hcksum_assoc(). So >>>> I'm soliciting the inputs of guys who work on drivers to make the >>>> interfaces as general as possible. I'm quite sure that Paul, Drew, and >>>> Tom can contribute to this. Please let me know if I'm not clear here.:-) >>> The thing I'd like to see changed is to be able to support both >>> HCK_PARTIALCKSUM and HW_LSO. Right now, I have to do a nasty hack to >>> get the MSS on my device (clear HCK_PARTIALCKSUM, get the mss, and >>> then put things back). >>> >>> Thanks, >>> Drew >> >> Me too. Now I'm writing my version of mervell yukon2 driver, which has >> partial checksum and lso capabilities. When I want to use both of partial >> checksum and lso, mss value of lso packets which hcksum_retrieve() >> returned seemed partial checksum, instead of mss. > >Yes, for packets flagged with LSO and partical checksum, the value >returned is partial checksum. This should be fixed. When >hcksum_retrieve() was originally implemented there was no >consideration on LSO as it appears later. Apparently, it does not work >well in your case. People suggested a separate interface should be >provided to retrieve the information for LSO and this is still under >discussion. > >Copy the email to PradeeP as he also works on a 10 Gigabit driver. > >Thanks, >Lucy > >> >> I also use lso for realtek816x and nVIDIA integrated nics, which have >> full checksum and lso capabilities. They work well for me. >> >> -masa >> >> _______________________________________________ >> driver-discuss mailing list >> driver-discuss@opensolaris.org >> http://mail.opensolaris.org/mailman/listinfo/driver-discuss >> > _______________________________________________ driver-discuss mailing list driver-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/driver-discuss
