[dpdk-dev] [PATCH v3] net/tap: fix isolation mode toggling

[Wiles, Keith]

> On May 14, 2018, at 5:26 PM, Ophir Munk <ophirmu at mellanox.com> wrote:
> 
> Running testpmd command "flow isolae <port> 0" (i.e. disabling flow
> isolation) followed by command "flow isolate <port> 1" (i.e. enabling
> flow isolation) may result in a TAP error:
> PMD: Kernel refused TC filter rule creation (17): File exists
> 
> Root cause analysis: when disabling flow isolation we keep the local
> rule to redirect packets on TX (TAP_REMOTE_TX index) while we add it
> again when enabling flow isolation. As a result this rule is added
> two times in a row which results in "File exists" error.
> The fix is to identify the "File exists" error and silently ignore it.
> 
> Another issue occurs when enabling isolation mode several times in a
> row in which case the same tc rules are added consecutively and
> rte_flow structs are added to a linked list before removing the
> previous rte_flow structs.
> The fix is to act upon isolation mode command only when there is a
> change from "0" to "1" (or vice versa).
> 
> Fixes: f503d2694825 ("net/tap: support flow API isolated mode")
> Cc: stable at dpdk.org
> 
> Reviewed-by: Raslan Darawsheh <rasland at mellanox.com>
> Signed-off-by: Ophir Munk <ophirmu at mellanox.com>
> —

Acked by: Keith Wiles<keith.wile at intel.com>

Regards,
Keith