Re: [PATCH v2 1/2] io_uring/zcrx: add single shot recvzc

[Jens Axboe <axboe@kernel.dk>]

>> @@ -1250,6 +1251,12 @@ int io_recvzc_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
>>       zc->ifq = req->ctx->ifq;
>>       if (!zc->ifq)
>>           return -EINVAL;
>> +    zc->len = READ_ONCE(sqe->len);
>> +    if (zc->len == UINT_MAX)
>> +        return -EINVAL;
> 
> The uapi gives u32, if we're using a special value it should
> match the type. ~(u32)0

Any syscall in Linux is capped at 2G anyway, so I think all of this
special meaning of ->len just needs to go away. Just ask for whatever
bytes you want, but yes more than 2G will not be supported anyway.

-- 
Jens Axboe