https://bugs.dpdk.org/show_bug.cgi?id=665
Bug ID: 665
Summary: i40e MBUF_FAST_FREE wrong check
Product: DPDK
Version: 20.05
Hardware: All
OS: All
Status: UNCONFIRMED
Severity: normal
Priority: Normal
Component: ethdev
Assignee: dev@dpdk.org
Reporter: sbaran...@gmail.com
Target Milestone: ---
In i40e_rxtx.c in i40e_set_tx_function_flag there's an assignment to
ad->tx_simple_allowed that includes a check for enabling "tx_simple_allowed":
txq->offloads == (txq->offloads & DEV_TX_OFFLOAD_MBUF_FAST_FREE)
This appears to be wrong to me. If no offload flags are set then 0 == 0 &
<anything> is true. This means that if DEV_TX_OFFLOAD_MBUF_FAST_FREE is NOT set
(and no other flags are set) then this check will still enable
`tx_simple_allowed`.
As best I can tell, this causes an issue with multiple mbuf pools are being
used to feed a single TX queue and no offload flags enable.
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