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From:   Breno Leitao <leitao@debian.org>
To:     io-uring@vger.kernel.org, linux-nvme@lists.infradead.org,
        asml.silence@gmail.com, hch@lst.de, axboe@kernel.dk,
        ming.lei@redhat.com
Cc:     leit@fb.com, linux-kernel@vger.kernel.org,
        linux-block@vger.kernel.org, sagi@grimberg.me, joshi.k@samsung.com,
        kbusch@kernel.org
Subject: [PATCH v4 1/3] io_uring: Create a helper to return the SQE size
Date:   Thu,  4 May 2023 05:18:54 -0700
Message-Id: <20230504121856.904491-2-leitao@debian.org>
In-Reply-To: <20230504121856.904491-1-leitao@debian.org>
References: <20230504121856.904491-1-leitao@debian.org>
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
Precedence: bulk

Create a simple helper that returns the size of the SQE. The SQE could
have two size, depending of the flags.

If IO_URING_SETUP_SQE128 flag is set, then return a double SQE,
otherwise returns the sizeof of io_uring_sqe (64 bytes).

Signed-off-by: Breno Leitao <leitao@debian.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
---
 io_uring/io_uring.h | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/io_uring/io_uring.h b/io_uring/io_uring.h
index 25515d69d205..259bf798a390 100644
--- a/io_uring/io_uring.h
+++ b/io_uring/io_uring.h
@@ -394,4 +394,14 @@ static inline void io_req_queue_tw_complete(struct io_kiocb *req, s32 res)
 	io_req_task_work_add(req);
 }
 
+/*
+ * IORING_SETUP_SQE128 contexts allocate twice the normal SQE size for each
+ * slot.
+ */
+static inline size_t uring_sqe_size(struct io_ring_ctx *ctx)
+{
+	if (ctx->flags & IORING_SETUP_SQE128)
+		return 2 * sizeof(struct io_uring_sqe);
+	return sizeof(struct io_uring_sqe);
+}
 #endif
-- 
2.34.1