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Claudiu Beznea says: ==================== net: macb: add pad and fcs support In [1] it was reported that UDP checksum is offloaded to hardware no mather it was previously computed in software or not. The proposal on [1] was to disable TX checksum offload. This series (mostly patch 3/3) address the issue described at [1] by setting NOCRC bit to TX buffer descriptor for SKBs that arrived from networking stack with checksum computed. For these packets padding and FCS need to be added (hardware doesn't compute them if NOCRC bit is set). The minimum packet size that hardware expects is 64 bytes (including FCS). This feature could not be used in case of GSO, so, it was used only for no GSO SKBs. For SKBs wich requires padding and FCS computation macb_pad_and_fcs() checks if there is enough headroom and tailroom in SKB to avoid copying SKB structure. Since macb_pad_and_fcs() may change SKB the macb_pad_and_fcs() was places in macb_start_xmit() b/w macb_csum_clear() and skb_headlen() calls. This patch was tested with pktgen in kernel tool in a script like this: (pktgen_sample01_simple.sh is at [2]): minSize=1 maxSize=1500 for i in `seq $minSize $maxSize` ; do copy="$(shuf -i 1-2000 -n 1)" ./pktgen_sample01_simple.sh -i eth0 \ -m <dst-mac-addr> -d <dst-ip-addr> -x -s $i -c $copy done minStep=1 maxStep=200 for i in `seq $minStep $maxStep` ; do copy="$(shuf -i 1-2000 -n 1)" size="$(shuf -i 1-1500 -n 1)" ./pktgen_sample01_simple.sh -i eth0 \ -m <dst-mac-addr> -d <dst-ip-addr> -x -s $size -c $copy done Changes since RFC: - in patch 3/3 order local variables by their lenght (reverse christmas tree format) [1] https://www.spinics.net/lists/netdev/msg505065.html [2] https://github.com/netoptimizer/network-testing/blob/master/pktgen/pktgen_sample01_simple.sh ==================== Signed-off-by: David S. Miller <davem@davemloft.net> |
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Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
See Documentation/00-INDEX for a list of what is contained in each file.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.