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From: Maxime Coquelin <maxime.coquelin@redhat.com>
To: dev@dpdk.org, chenbo.xia@intel.com, amorenoz@redhat.com,
	david.marchand@redhat.com, olivier.matz@6wind.com,
	bnemeth@redhat.com
Cc: Maxime Coquelin <maxime.coquelin@redhat.com>
Subject: [dpdk-dev] [PATCH v4 4/4] net/virtio: pack virtqueue struct
Date: Tue, 16 Mar 2021 10:38:25 +0100	[thread overview]
Message-ID: <20210316093825.478723-5-maxime.coquelin@redhat.com> (raw)
In-Reply-To: <20210316093825.478723-1-maxime.coquelin@redhat.com>

This patch optimizes packing of the virtqueue
struct by moving fields around to fill holes.

Offset field is not used and so can be removed.

Signed-off-by: Maxime Coquelin <maxime.coquelin@redhat.com>
Reviewed-by: Chenbo Xia <chenbo.xia@intel.com>
Reviewed-by: David Marchand <david.marchand@redhat.com>
---
 drivers/net/virtio/virtqueue.h | 18 +++++++++---------
 1 file changed, 9 insertions(+), 9 deletions(-)

diff --git a/drivers/net/virtio/virtqueue.h b/drivers/net/virtio/virtqueue.h
index 17e76f0e8c..e9992b745d 100644
--- a/drivers/net/virtio/virtqueue.h
+++ b/drivers/net/virtio/virtqueue.h
@@ -244,6 +244,15 @@ struct virtqueue {
 	uint16_t vq_avail_idx; /**< sync until needed */
 	uint16_t vq_free_thresh; /**< free threshold */
 
+	/**
+	 * Head of the free chain in the descriptor table. If
+	 * there are no free descriptors, this will be set to
+	 * VQ_RING_DESC_CHAIN_END.
+	 */
+	uint16_t  vq_desc_head_idx;
+	uint16_t  vq_desc_tail_idx;
+	uint16_t  vq_queue_index;   /**< PCI queue index */
+
 	void *vq_ring_virt_mem;  /**< linear address of vring*/
 	unsigned int vq_ring_size;
 
@@ -256,15 +265,6 @@ struct virtqueue {
 	rte_iova_t vq_ring_mem; /**< physical address of vring,
 	                         * or virtual address for virtio_user. */
 
-	/**
-	 * Head of the free chain in the descriptor table. If
-	 * there are no free descriptors, this will be set to
-	 * VQ_RING_DESC_CHAIN_END.
-	 */
-	uint16_t  vq_desc_head_idx;
-	uint16_t  vq_desc_tail_idx;
-	uint16_t  vq_queue_index;
-	uint16_t offset; /**< relative offset to obtain addr in mbuf */
 	uint16_t  *notify_addr;
 	struct rte_mbuf **sw_ring;  /**< RX software ring. */
 	struct vq_desc_extra vq_descx[0];
-- 
2.29.2


  parent reply	other threads:[~2021-03-16  9:39 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-03-16  9:38 [dpdk-dev] [PATCH v4 0/4] net/virtio: make virtqueue struct cache-friendly Maxime Coquelin
2021-03-16  9:38 ` [dpdk-dev] [PATCH v4 1/4] net/virtio: remove reference to virtqueue in vrings Maxime Coquelin
2021-03-16  9:38 ` [dpdk-dev] [PATCH v4 2/4] net/virtio: improve queue init error path Maxime Coquelin
2021-03-17  9:01   ` Xia, Chenbo
2021-03-16  9:38 ` [dpdk-dev] [PATCH v4 3/4] net/virtio: allocate fake mbuf in Rx queue Maxime Coquelin
2021-03-17  9:10   ` Xia, Chenbo
2021-03-16  9:38 ` Maxime Coquelin [this message]
2021-03-29 10:55 ` [dpdk-dev] [PATCH v4 0/4] net/virtio: make virtqueue struct cache-friendly Balazs Nemeth
2021-03-31  5:44 ` Xia, Chenbo

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