[PATCH 0/3] net/txgbe: fix FDIR Rx packet buffer handling

[Jiawen Wu]

> -----Original Message-----
> From: Zhang Tengfei <zhtfdev at gmail.com>
> Sent: Tuesday, October 13, 2026 10:00 PM
> To: dev at dpdk.org; dev at dpdk.org
> Cc: stephen at networkplumber.org; Zhang Tengfei <zhtfdev at gmail.com>; jiawenwu at trustnetic.com; zaiyuwang at trustnetic.com;
> stephen at networkplumber.org; Zhang Tengfei <zhtfdev at gmail.com>; jiawenwu at trustnetic.com; zaiyuwang at trustnetic.com
> Subject: [PATCH 0/3] net/txgbe: fix FDIR Rx packet buffer handling
> 
> Enabling Flow Director reduces the Rx packet buffer 0 to reserve memory
> for the filter table, but the size was computed from the current
> register value and never restored when FDIR was no longer used. Since
> the FDIR mode is reset when the last rule is removed, on flush, or when
> enabling FDIR fails, the next rule enabled FDIR again and shrank the
> buffer once more, until it underflowed. Validating a rule also enabled
> FDIR.
> 
> Patch 1 computes the buffer size from the default packet buffer size,
> which alone stops the repeated reduction.
> Patch 2 stops enabling FDIR from flow validate and rolls back the mode
> when the first rule fails.
> Patch 3 disables FDIR and restores the buffer when no rule is left.
> 
> The same issue was fixed in ixgbe:
> <https://patches.dpdk.org/project/dpdk/patch/20260927042545.45152-1-zhtfdev@gmail.com>
> 
> Compile tested only.

It should to be tested with the actual NICs.

> 
> Zhang Tengfei (3):
>   net/txgbe: fix Rx packet buffer size with flow director
>   net/txgbe: do not enable flow director on flow validate
>   net/txgbe: disable flow director when no rule is left
> 
>  drivers/net/txgbe/txgbe_ethdev.h |  1 +
>  drivers/net/txgbe/txgbe_fdir.c   | 36 +++++++++++++++----
>  drivers/net/txgbe/txgbe_flow.c   | 60 +++++++++++++++++---------------
>  3 files changed, 62 insertions(+), 35 deletions(-)
> 
> --
> 2.53.0
> 
>