[PATCH v2] net/ixgbe: fix repeated Rx packet buffer shrink for FDIR

[Bruce Richardson]

On Tue, Oct 06, 2026 at 11:23:06AM +0200, Burakov, Anatoly wrote:
> On 9/27/2026 6:25 AM, Zhang Tengfei wrote:
> > Enabling Flow Director reduces RXPBSIZE(0) to reserve packet buffer
> > memory for the filter table. The new size was computed from the current
> > register value, and nothing restored it when FDIR state was reset. After
> > the last FDIR rule was removed, or when the first rule failed after FDIR
> > had been enabled, the next rule created enabled FDIR again and reduced
> > the buffer a second time.
> > 
> > Compute RXPBSIZE(0) from the default packet buffer size, and disable
> > FDIR and restore the buffer when the last rule is removed, on flush, and
> > on the enable error paths.
> > 
> > Fixes: 301abd26b118 ("net/ixgbe: reset flow state on clear paths")
> > Fixes: 5007ac13189d ("ethdev: remove deprecated Flow Director configuration")
> > Cc: stable at dpdk.org
> > 
> > Signed-off-by: Zhang Tengfei <zhtfdev at gmail.com>
> > ---
> 
> Acked-by: Anatoly Burakov <anatoly.burakov at intel.com>
> 
Applied to dpdk-next-net-intel

/Bruce