Re: [PATCH 1/1] xskmap: reject TX-only AF_XDP sockets

[Yuan Tan]

On 4/15/2026 1:43 AM, Jason Xing wrote:
> On Mon, Mar 30, 2026 at 3:33 AM Linpu Yu <linpu5433@xxxxxxxxx> wrote:
>> Reject TX-only AF_XDP sockets from XSKMAP updates. Redirected
>> packets always enter the Rx path, where the kernel expects the
>> selected socket to have an Rx ring. A TX-only socket can
>> currently be inserted into an XSKMAP, and redirecting a packet
>> to it crashes the kernel in xsk_generic_rcv().
>>
>> Keep TX-only AF_XDP sockets valid for pure Tx use, but prevent
>> them from being published through XSKMAP.
>>
>> Fixes: fbfc504a24f5 ("bpf: introduce new bpf AF_XDP map type BPF_MAP_TYPE_XSKMAP")
>> Reported-by: Juefei Pu <tomapufckgml@xxxxxxxxx>
>> Reported-by: Yuan Tan <yuantan098@xxxxxxxxx>
>> Signed-off-by: Xin Liu <bird@xxxxxxxxxx>
>> Signed-off-by: Yifan Wu <yifanwucs@xxxxxxxxx>
>> Signed-off-by: Linpu Yu <linpu5433@xxxxxxxxx>
> Hi Linpu,
>
> Any plan to post a v2 with our questions resolved?
>
> Thanks,
> Jason

Hi Jason, Linpu has an exam to take this week. He told he can try
preparing the v2 patch this weekend. Best,

Yuan