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From: Maxime Coquelin <maxime.coquelin@redhat.com>
To: dev@dpdk.org, chenbo.xia@intel.com, yong.liu@intel.com
Cc: Maxime Coquelin <maxime.coquelin@redhat.com>
Subject: [dpdk-dev] [PATCH 2/2] vhost: use fixed Virtio-net header len packed ring
Date: Thu,  1 Oct 2020 12:11:55 +0200	[thread overview]
Message-ID: <20201001101155.206237-3-maxime.coquelin@redhat.com> (raw)
In-Reply-To: <20201001101155.206237-1-maxime.coquelin@redhat.com>

This small optimization uses static the Virtio-net header len
in packed datapath, since Virtio-net header cannot be the
legacy one in case of packed ring.

Signed-off-by: Maxime Coquelin <maxime.coquelin@redhat.com>
---
 lib/librte_vhost/virtio_net.c | 11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

diff --git a/lib/librte_vhost/virtio_net.c b/lib/librte_vhost/virtio_net.c
index 0a0bea1a5a..5865fa5f65 100644
--- a/lib/librte_vhost/virtio_net.c
+++ b/lib/librte_vhost/virtio_net.c
@@ -1147,7 +1147,7 @@ vhost_enqueue_single_packed(struct virtio_net *dev,
 	uint16_t buf_id = 0;
 	uint32_t len = 0;
 	uint16_t desc_count;
-	uint32_t size = pkt->pkt_len + dev->vhost_hlen;
+	uint32_t size = pkt->pkt_len + sizeof(struct virtio_net_hdr_mrg_rxbuf);
 	uint16_t num_buffers = 0;
 	uint32_t buffer_len[vq->size];
 	uint16_t buffer_buf_id[vq->size];
@@ -1262,7 +1262,7 @@ virtio_dev_rx_batch_packed(struct virtio_net *dev,
 	uint16_t avail_idx = vq->last_avail_idx;
 	uint64_t desc_addrs[PACKED_BATCH_SIZE];
 	struct virtio_net_hdr_mrg_rxbuf *hdrs[PACKED_BATCH_SIZE];
-	uint32_t buf_offset = dev->vhost_hlen;
+	uint32_t buf_offset = sizeof(struct virtio_net_hdr_mrg_rxbuf);
 	uint64_t lens[PACKED_BATCH_SIZE];
 	uint16_t ids[PACKED_BATCH_SIZE];
 	uint16_t i;
@@ -1308,7 +1308,8 @@ virtio_dev_rx_batch_packed(struct virtio_net *dev,
 		rte_prefetch0((void *)(uintptr_t)desc_addrs[i]);
 		hdrs[i] = (struct virtio_net_hdr_mrg_rxbuf *)
 					(uintptr_t)desc_addrs[i];
-		lens[i] = pkts[i]->pkt_len + dev->vhost_hlen;
+		lens[i] = pkts[i]->pkt_len +
+			sizeof(struct virtio_net_hdr_mrg_rxbuf);
 	}
 
 	vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE)
@@ -2277,7 +2278,7 @@ vhost_reserve_avail_batch_packed(struct virtio_net *dev,
 	struct virtio_net_hdr *hdr;
 	uint64_t lens[PACKED_BATCH_SIZE];
 	uint64_t buf_lens[PACKED_BATCH_SIZE];
-	uint32_t buf_offset = dev->vhost_hlen;
+	uint32_t buf_offset = sizeof(struct virtio_net_hdr_mrg_rxbuf);
 	uint16_t flags, i;
 
 	if (unlikely(avail_idx & PACKED_BATCH_MASK))
@@ -2354,7 +2355,7 @@ virtio_dev_tx_batch_packed(struct virtio_net *dev,
 			   struct rte_mbuf **pkts)
 {
 	uint16_t avail_idx = vq->last_avail_idx;
-	uint32_t buf_offset = dev->vhost_hlen;
+	uint32_t buf_offset = sizeof(struct virtio_net_hdr_mrg_rxbuf);
 	uintptr_t desc_addrs[PACKED_BATCH_SIZE];
 	uint16_t ids[PACKED_BATCH_SIZE];
 	uint16_t i;
-- 
2.26.2


  parent reply	other threads:[~2020-10-01 10:12 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-10-01 10:11 [dpdk-dev] [PATCH 0/2] Fix packed ring header len Maxime Coquelin
2020-10-01 10:11 ` [dpdk-dev] [PATCH 1/2] vhost: fix Virtio-net header len with packed ring Maxime Coquelin
2020-10-09  6:33   ` Xia, Chenbo
2020-10-01 10:11 ` Maxime Coquelin [this message]
2020-10-09  6:36   ` [dpdk-dev] [PATCH 2/2] vhost: use fixed Virtio-net header len " Xia, Chenbo
2020-10-09  7:23     ` Maxime Coquelin
2020-10-09  7:23 ` [dpdk-dev] [PATCH 0/2] Fix packed ring header len Maxime Coquelin

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