This was introduced with the message ring opcode, but isn't strictly required for the request itself. The sender can encode what is needed in user_data, which is passed to the receiver. It's unclear if having a separate flag that essentially says "This CQE did not originate from an SQE on this ring" provides any real utility to applications. While we can always re-introduce a flag to provide this information, we cannot take it away at a later point in time. Remove the flag while we still can, before it's in a released kernel.
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| @@ -201,11 +201,9 @@ struct io_uring_cqe { · 200 unmodified lines | ||
| 201 | 201 | * |
| 202 | 202 | * IORING_CQE_F_BUFFER If set, the upper 16 bits are the buffer ID |
| 203 | 203 | * IORING_CQE_F_MORE If set, parent SQE will generate more CQE entries |
| 204 | − * IORING_CQE_F_MSG If set, CQE was generated with IORING_OP_MSG_RING | |
| 205 | 204 | */ |
| 206 | 205 | #define IORING_CQE_F_BUFFER (1U << 0) |
| 207 | 206 | #define IORING_CQE_F_MORE (1U << 1) |
| 208 | −#define IORING_CQE_F_MSG (1U << 2) | |
| 209 | 207 | |
| 210 | 208 | enum { |
| 211 | 209 | IORING_CQE_BUFFER_SHIFT = 16, |