On 4/21/22 6:51 PM, Kanchan Joshi wrote:
> On Thu, Apr 21, 2022 at 12:02 PM Stefan Roesch <shr@xxxxxx> wrote:
>>
>> This adds the struct io_uring_cqe_extra in the structure io_uring_cqe to
>> support large CQE's.
>>
>> Co-developed-by: Jens Axboe <axboe@xxxxxxxxx>
>> Signed-off-by: Stefan Roesch <shr@xxxxxx>
>> Signed-off-by: Jens Axboe <axboe@xxxxxxxxx>
>> ---
>> include/uapi/linux/io_uring.h | 12 ++++++++++++
>> 1 file changed, 12 insertions(+)
>>
>> diff --git a/include/uapi/linux/io_uring.h b/include/uapi/linux/io_uring.h
>> index ee677dbd6a6d..6f9f9b6a9d15 100644
>> --- a/include/uapi/linux/io_uring.h
>> +++ b/include/uapi/linux/io_uring.h
>> @@ -111,6 +111,7 @@ enum {
>> #define IORING_SETUP_R_DISABLED (1U << 6) /* start with ring disabled */
>> #define IORING_SETUP_SUBMIT_ALL (1U << 7) /* continue submit on error */
>> #define IORING_SETUP_SQE128 (1U << 8) /* SQEs are 128b */
>> +#define IORING_SETUP_CQE32 (1U << 9) /* CQEs are 32b */
>>
>> enum {
>> IORING_OP_NOP,
>> @@ -201,6 +202,11 @@ enum {
>> #define IORING_POLL_UPDATE_EVENTS (1U << 1)
>> #define IORING_POLL_UPDATE_USER_DATA (1U << 2)
>>
>> +struct io_uring_cqe_extra {
>> + __u64 extra1;
>> + __u64 extra2;
>> +};
>> +
>> /*
>> * IO completion data structure (Completion Queue Entry)
>> */
>> @@ -208,6 +214,12 @@ struct io_uring_cqe {
>> __u64 user_data; /* sqe->data submission passed back */
>> __s32 res; /* result code for this event */
>> __u32 flags;
>> +
>> + /*
>> + * If the ring is initialized with IORING_SETUP_CQE32, then this field
>> + * contains 16-bytes of padding, doubling the size of the CQE.
>> + */
>> + struct io_uring_cqe_extra b[0];
>> };
> Will it be any better to replace struct b[0] with "u64 extra[ ]" ?
> With that new fields will be referred as cqe->extra[0] and cqe->extra[1].
>
> And if we go that route, maybe "aux" sounds better than "extra".
Let's use __u64 big_cqe[];
