diff options
| author | Alex Elder <[email protected]> | 2021-06-02 07:41:30 -0500 |
|---|---|---|
| committer | David S. Miller <[email protected]> | 2021-06-03 15:09:40 -0700 |
| commit | 5567d4d9e7381230462a564d4f466177f3ba9dd5 (patch) | |
| tree | 0102afcf7689e9172a1d2a31c56e2940d7efb238 /tools/perf/scripts/python | |
| parent | fcd1a53064cf44ef912c354859027ef291147848 (diff) | |
net: ipa: add support for inline checksum offload
Starting with IPA v4.5, IP payload checksum offload is implemented
differently.
Prior to v4.5, the IPA hardware appends an rmnet_map_dl_csum_trailer
structure to each packet if checksum offload is enabled in the
download direction (modem->AP). In the upload direction (AP->modem)
a rmnet_map_ul_csum_header structure is prepended before each sent
packet.
Starting with IPA v4.5, checksum offload is implemented using a
single new rmnet_map_v5_csum_header structure which sits between
the QMAP header and the packet data. The same header structure
is used in both directions.
The new header contains a header type (CSUM_OFFLOAD); a checksum
flag; and a flag indicating whether any other headers follow this
one. The checksum flag indicates whether the hardware should
compute (and insert) the checksum on a sent packet. On a received
packet the checksum flag indicates whether the hardware confirms the
checksum value in the payload is correct.
Signed-off-by: Alex Elder <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
Diffstat (limited to 'tools/perf/scripts/python')
0 files changed, 0 insertions, 0 deletions