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authorAnton Vorontsov <avorontsov@mvista.com>2010-06-30 08:39:12 +0200
committerDavid S. Miller <davem@davemloft.net>2010-06-30 20:35:42 +0200
commit7d3509774c2ef4ffd1c5fd2fac65dc4e071a6f21 (patch)
tree54d32c6f6f6c72fee208ab8dea9879697b613765 /arch
parentnet/core: use ntohs for skb->protocol (diff)
downloadlinux-7d3509774c2ef4ffd1c5fd2fac65dc4e071a6f21.tar.xz
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gianfar: Implement workaround for eTSEC74 erratum
MPC8313ECE says: "If MACCFG2[Huge Frame]=0 and the Ethernet controller receives frames which are larger than MAXFRM, the controller truncates the frames to length MAXFRM and marks RxBD[TR]=1 to indicate the error. The controller also erroneously marks RxBD[TR]=1 if the received frame length is MAXFRM or MAXFRM-1, even though those frames are not truncated. No truncation or truncation error occurs if MACCFG2[Huge Frame]=1." There are two options to workaround the issue: "1. Set MACCFG2[Huge Frame]=1, so no truncation occurs for invalid large frames. Software can determine if a frame is larger than MAXFRM by reading RxBD[LG] or RxBD[Data Length]. 2. Set MAXFRM to 1538 (0x602) instead of the default 1536 (0x600), so normal-length frames are not marked as truncated. Software can examine RxBD[Data Length] to determine if the frame was larger than MAXFRM-2." This patch implements the first workaround option by setting HUGEFRAME bit, and gfar_clean_rx_ring() already checks the RxBD[Data Length]. Signed-off-by: Anton Vorontsov <avorontsov@mvista.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'arch')
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