Date: Wed, 17 Jul 2002 07:59:07 -0700 From: Alfred Perlstein <bright@mu.org> To: shubha mr <shubha_mr@yahoo.com> Cc: net@freebsd.org Subject: Re: IP Fragmentation Message-ID: <20020717145907.GY77219@elvis.mu.org> In-Reply-To: <20020717104943.57136.qmail@web14605.mail.yahoo.com> References: <20020717104943.57136.qmail@web14605.mail.yahoo.com>
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* shubha mr <shubha_mr@yahoo.com> [020717 03:50] wrote: > Hi, > I am writing a gigabit ethernet driver for one of the > NICs.My hardware is capable of computing the checksum > and hence I am enabling per-packet handling of > TCP/IP/UDP checksum offload in transmit side.I would > like to know if there is a way by which I can tell the > upperguy that I will not be able to compute the tcp > checksum for the fragmented packets.That is I want to > indicate that checksum offload can be offloaded only > for the non fragmented and hence complete packets > only. From mbuf.h: #define CSUM_IP 0x0001 /* will csum IP */ #define CSUM_TCP 0x0002 /* will csum TCP */ #define CSUM_UDP 0x0004 /* will csum UDP */ #define CSUM_IP_FRAGS 0x0008 /* will csum IP fragments */ #define CSUM_FRAGMENT 0x0010 /* will do IP fragmentation */ Just use the first 3, have a look at the if_bge.c driver for an example. -- -Alfred Perlstein [alfred@freebsd.org] 'Instead of asking why a piece of software is using "1970s technology," start asking why software is ignoring 30 years of accumulated wisdom.' Tax deductible donations for FreeBSD: http://www.freebsdfoundation.org/ To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-net" in the body of the message
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