> -----Original Message-----
> From: Zhang Tengfei <[email protected]>
> Sent: Tuesday, October 13, 2026 10:00 PM
> To: [email protected]; [email protected]
> Cc: [email protected]; Zhang Tengfei <[email protected]>;
> [email protected]; [email protected];
> [email protected]; Zhang Tengfei <[email protected]>;
> [email protected]; [email protected]
> 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/[email protected]>
>
> 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
>
>
