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Date: Mon, 24 Nov 2008 17:33:41 +0100 From: Krzysztof Halasa <khc@...waw.pl> To: Miguel Ángel Álvarez <gotzoncabanes@...il.com> Cc: "Francois Romieu" <romieu@...zoreil.com>, netdev@...r.kernel.org Subject: Re: How to use ixp4xx_hss (or generic-hdlc?) "Miguel Ángel Álvarez" <gotzoncabanes@...il.com> writes: > I am not sure of having understood you. The buffer I send using sendto > should be just the payload and the generic-hdlc (or the hardware) > encapsulates it in an hdlc frame, or should I prepare the whole > frame? You sendto() the payload, but what is a payload? With a normal HDLC hw driver, it (and the hardware) will generate the flag sequences, will do bit-(de)stuffing, will calculate and check the checksums, residual bits, aborts etc. You usually have to add 32-bit header: u8 address (broadcast, multicast, unicast) and control (such as unnumbered frame type), and u16 protocol number (IPv4, IPv6 etc, LCP/IPCP, Cisco keepalive etc). That's why it's called "raw HDLC", you're dealing with raw HDLC packets. > I took a little different approach, using the same PF_PACKET socket to > obtain the ifr_ifindex, but in any case using your method or "my" > method, and activating the debugging in ixp4xx_hss, when I do a two > byte (0x30 0x31) sendto, the traces in debug_pkt give me: > > 1970/01/01,00:00:47 (none) user.debug kernel: hdlc0: hss_hdlc_xmit(2) > <7> 30<7>31<7> It should do just that (those '<7>' are weird, though). -- Krzysztof Halasa -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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