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| author |   Luca Boccassi <luca.boccassi@gmail.com> | 2018-11-12 16:14:45 +0000 |
|---|---|---|
| committer | Luca Boccassi <luca.boccassi@gmail.com> | 2018-11-12 16:15:06 +0000 |
| commit | 88fab00d4402af240c1b7cc2566133aece115488 (patch) | |
| tree | 54525f2b8784dd20ce6886b429ef85d24df04532 /doc/guides/nics/i40e.rst | |
| parent | 8d01b9cd70a67cdafd5b965a70420c3bd7fb3f82 (diff) | |
New upstream version 18.11-rc2upstream/18.11-rc2
Change-Id: I43ca4edd0747b2dfc38c574ebf3c0aac17d7392c
Signed-off-by: Luca Boccassi <luca.boccassi@gmail.com>
Diffstat (limited to 'doc/guides/nics/i40e.rst')
| -rw-r--r-- | doc/guides/nics/i40e.rst | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/doc/guides/nics/i40e.rst b/doc/guides/nics/i40e.rst index ab3928a6..bfacbd11 100644 --- a/doc/guides/nics/i40e.rst +++ b/doc/guides/nics/i40e.rst @@ -172,6 +172,13 @@ Runtime Config Options -w 84:00.0,use-latest-supported-vec=1 +Vector RX Pre-conditions +~~~~~~~~~~~~~~~~~~~~~~~~ +For Vector RX it is assumed that the number of descriptor rings will be a power +of 2. With this pre-condition, the ring pointer can easily scroll back to the +head after hitting the tail without a conditional check. In addition Vector RX +can use this assumption to do a bit mask using ``ring_size - 1``. + Driver compilation and testing ------------------------------ |