From: Maxime Coquelin <maxime.coquelin@redhat.com>
To: olivier.matz@6wind.com, david.marchand@redhat.com,
chenbo.xia@intel.com, dev@dpdk.org
Cc: Maxime Coquelin <maxime.coquelin@redhat.com>, stable@dpdk.org
Subject: [dpdk-dev] [PATCH] net/virtio: revert forcing IOVA as VA mode for virtio-user
Date: Wed, 29 Sep 2021 22:17:39 +0200 [thread overview]
Message-ID: <20210929201739.176306-1-maxime.coquelin@redhat.com> (raw)
This patch removes the simplification in Virtio descriptors
handling, where their buffer addresses are IOVAs for Virtio
PCI devices, and VA-only for Virtio-user devices, which
added a requirement on Virtio-user that it only supported
IOVA as VA.
This change introduced a regression for applications using
Virtio-user and other physical PMDs that require IOVA as PA
because they don't use an IOMMU.
This patch reverts to the old behaviour, but needed to be
reworked because of the refactoring that happened in v21.02.
Fixes: 17043a2909bb ("net/virtio: force IOVA as VA mode for virtio-user")
Cc: stable@dpdk.org
Reported-by: Olivier Matz <olivier.matz@6wind.com>
Signed-off-by: Maxime Coquelin <maxime.coquelin@redhat.com>
---
drivers/net/virtio/virtio.h | 1 +
drivers/net/virtio/virtio_ethdev.c | 25 +++++++++++++----
drivers/net/virtio/virtio_rxtx.c | 28 ++++++++++++--------
drivers/net/virtio/virtio_rxtx_packed.h | 2 +-
drivers/net/virtio/virtio_rxtx_packed_avx.h | 8 +++---
drivers/net/virtio/virtio_rxtx_packed_neon.h | 8 +++---
drivers/net/virtio/virtio_rxtx_simple.h | 3 ++-
drivers/net/virtio/virtio_user_ethdev.c | 7 ++++-
drivers/net/virtio/virtqueue.h | 22 ++++++++++++++-
9 files changed, 76 insertions(+), 28 deletions(-)
diff --git a/drivers/net/virtio/virtio.h b/drivers/net/virtio/virtio.h
index b4f21dc0c7..7118e5d24c 100644
--- a/drivers/net/virtio/virtio.h
+++ b/drivers/net/virtio/virtio.h
@@ -221,6 +221,7 @@ struct virtio_hw {
uint8_t *rss_key;
uint64_t req_guest_features;
struct virtnet_ctl *cvq;
+ bool use_va;
};
struct virtio_ops {
diff --git a/drivers/net/virtio/virtio_ethdev.c b/drivers/net/virtio/virtio_ethdev.c
index b4bd1f07c1..8055be88a2 100644
--- a/drivers/net/virtio/virtio_ethdev.c
+++ b/drivers/net/virtio/virtio_ethdev.c
@@ -567,12 +567,16 @@ virtio_init_queue(struct rte_eth_dev *dev, uint16_t queue_idx)
memset(mz->addr, 0, mz->len);
- vq->vq_ring_mem = mz->iova;
+ if (hw->use_va)
+ vq->vq_ring_mem = (uintptr_t)mz->addr;
+ else
+ vq->vq_ring_mem = mz->iova;
+
vq->vq_ring_virt_mem = mz->addr;
PMD_INIT_LOG(DEBUG, "vq->vq_ring_mem: 0x%" PRIx64,
- (uint64_t)mz->iova);
+ (uint64_t)vq->vq_ring_mem);
PMD_INIT_LOG(DEBUG, "vq->vq_ring_virt_mem: 0x%" PRIx64,
- (uint64_t)(uintptr_t)mz->addr);
+ (uint64_t)(uintptr_t)vq->vq_ring_virt_mem);
virtio_init_vring(vq);
@@ -622,17 +626,28 @@ virtio_init_queue(struct rte_eth_dev *dev, uint16_t queue_idx)
txvq->port_id = dev->data->port_id;
txvq->mz = mz;
txvq->virtio_net_hdr_mz = hdr_mz;
- txvq->virtio_net_hdr_mem = hdr_mz->iova;
+ if (hw->use_va)
+ txvq->virtio_net_hdr_mem = (uintptr_t)hdr_mz->addr;
+ else
+ txvq->virtio_net_hdr_mem = hdr_mz->iova;
} else if (queue_type == VTNET_CQ) {
cvq = &vq->cq;
cvq->mz = mz;
cvq->virtio_net_hdr_mz = hdr_mz;
- cvq->virtio_net_hdr_mem = hdr_mz->iova;
+ if (hw->use_va)
+ cvq->virtio_net_hdr_mem = (uintptr_t)hdr_mz->addr;
+ else
+ cvq->virtio_net_hdr_mem = hdr_mz->iova;
memset(cvq->virtio_net_hdr_mz->addr, 0, rte_mem_page_size());
hw->cvq = cvq;
}
+ if (hw->use_va)
+ vq->mbuf_addr_offset = offsetof(struct rte_mbuf, buf_addr);
+ else
+ vq->mbuf_addr_offset = offsetof(struct rte_mbuf, buf_iova);
+
if (queue_type == VTNET_TQ) {
struct virtio_tx_region *txr;
unsigned int i;
diff --git a/drivers/net/virtio/virtio_rxtx.c b/drivers/net/virtio/virtio_rxtx.c
index b9d7c8d18f..0f3c286438 100644
--- a/drivers/net/virtio/virtio_rxtx.c
+++ b/drivers/net/virtio/virtio_rxtx.c
@@ -271,10 +271,13 @@ virtqueue_enqueue_refill_inorder(struct virtqueue *vq,
dxp->cookie = (void *)cookies[i];
dxp->ndescs = 1;
- start_dp[idx].addr = cookies[i]->buf_iova +
- RTE_PKTMBUF_HEADROOM - hw->vtnet_hdr_size;
- start_dp[idx].len = cookies[i]->buf_len -
- RTE_PKTMBUF_HEADROOM + hw->vtnet_hdr_size;
+ start_dp[idx].addr =
+ VIRTIO_MBUF_ADDR(cookies[i], vq) +
+ RTE_PKTMBUF_HEADROOM - hw->vtnet_hdr_size;
+ start_dp[idx].len =
+ cookies[i]->buf_len -
+ RTE_PKTMBUF_HEADROOM +
+ hw->vtnet_hdr_size;
start_dp[idx].flags = VRING_DESC_F_WRITE;
vq_update_avail_ring(vq, idx);
@@ -310,10 +313,12 @@ virtqueue_enqueue_recv_refill(struct virtqueue *vq, struct rte_mbuf **cookie,
dxp->cookie = (void *)cookie[i];
dxp->ndescs = 1;
- start_dp[idx].addr = cookie[i]->buf_iova +
+ start_dp[idx].addr =
+ VIRTIO_MBUF_ADDR(cookie[i], vq) +
RTE_PKTMBUF_HEADROOM - hw->vtnet_hdr_size;
- start_dp[idx].len = cookie[i]->buf_len -
- RTE_PKTMBUF_HEADROOM + hw->vtnet_hdr_size;
+ start_dp[idx].len =
+ cookie[i]->buf_len - RTE_PKTMBUF_HEADROOM +
+ hw->vtnet_hdr_size;
start_dp[idx].flags = VRING_DESC_F_WRITE;
vq->vq_desc_head_idx = start_dp[idx].next;
vq_update_avail_ring(vq, idx);
@@ -336,7 +341,7 @@ virtqueue_refill_single_packed(struct virtqueue *vq,
uint16_t flags = vq->vq_packed.cached_flags;
struct virtio_hw *hw = vq->hw;
- dp->addr = cookie->buf_iova +
+ dp->addr = VIRTIO_MBUF_ADDR(cookie, vq) +
RTE_PKTMBUF_HEADROOM - hw->vtnet_hdr_size;
dp->len = cookie->buf_len -
RTE_PKTMBUF_HEADROOM + hw->vtnet_hdr_size;
@@ -482,7 +487,8 @@ virtqueue_enqueue_xmit_inorder(struct virtnet_tx *txvq,
else
virtqueue_xmit_offload(hdr, cookies[i]);
- start_dp[idx].addr = rte_mbuf_data_iova(cookies[i]) - head_size;
+ start_dp[idx].addr =
+ VIRTIO_MBUF_DATA_DMA_ADDR(cookies[i], vq) - head_size;
start_dp[idx].len = cookies[i]->data_len + head_size;
start_dp[idx].flags = 0;
@@ -529,7 +535,7 @@ virtqueue_enqueue_xmit_packed_fast(struct virtnet_tx *txvq,
else
virtqueue_xmit_offload(hdr, cookie);
- dp->addr = rte_mbuf_data_iova(cookie) - head_size;
+ dp->addr = VIRTIO_MBUF_DATA_DMA_ADDR(cookie, vq) - head_size;
dp->len = cookie->data_len + head_size;
dp->id = id;
@@ -617,7 +623,7 @@ virtqueue_enqueue_xmit(struct virtnet_tx *txvq, struct rte_mbuf *cookie,
virtqueue_xmit_offload(hdr, cookie);
do {
- start_dp[idx].addr = rte_mbuf_data_iova(cookie);
+ start_dp[idx].addr = VIRTIO_MBUF_DATA_DMA_ADDR(cookie, vq);
start_dp[idx].len = cookie->data_len;
if (prepend_header) {
start_dp[idx].addr -= head_size;
diff --git a/drivers/net/virtio/virtio_rxtx_packed.h b/drivers/net/virtio/virtio_rxtx_packed.h
index 1d1db60da8..77e5cb37e7 100644
--- a/drivers/net/virtio/virtio_rxtx_packed.h
+++ b/drivers/net/virtio/virtio_rxtx_packed.h
@@ -288,7 +288,7 @@ virtio_recv_refill_packed_vec(struct virtnet_rx *rxvq,
dxp = &vq->vq_descx[idx + i];
dxp->cookie = (void *)cookie[total_num + i];
- addr = cookie[total_num + i]->buf_iova +
+ addr = VIRTIO_MBUF_ADDR(cookie[total_num + i], vq) +
RTE_PKTMBUF_HEADROOM - hw->vtnet_hdr_size;
start_dp[idx + i].addr = addr;
start_dp[idx + i].len = cookie[total_num + i]->buf_len
diff --git a/drivers/net/virtio/virtio_rxtx_packed_avx.h b/drivers/net/virtio/virtio_rxtx_packed_avx.h
index c819d2e4f2..8cb71f3fe6 100644
--- a/drivers/net/virtio/virtio_rxtx_packed_avx.h
+++ b/drivers/net/virtio/virtio_rxtx_packed_avx.h
@@ -71,13 +71,13 @@ virtqueue_enqueue_batch_packed_vec(struct virtnet_tx *txvq,
}
__m512i descs_base = _mm512_set_epi64(tx_pkts[3]->data_len,
- tx_pkts[3]->buf_iova,
+ VIRTIO_MBUF_ADDR(tx_pkts[3], vq),
tx_pkts[2]->data_len,
- tx_pkts[2]->buf_iova,
+ VIRTIO_MBUF_ADDR(tx_pkts[2], vq),
tx_pkts[1]->data_len,
- tx_pkts[1]->buf_iova,
+ VIRTIO_MBUF_ADDR(tx_pkts[1], vq),
tx_pkts[0]->data_len,
- tx_pkts[0]->buf_iova);
+ VIRTIO_MBUF_ADDR(tx_pkts[0], vq));
/* id offset and data offset */
__m512i data_offsets = _mm512_set_epi64((uint64_t)3 << ID_BITS_OFFSET,
diff --git a/drivers/net/virtio/virtio_rxtx_packed_neon.h b/drivers/net/virtio/virtio_rxtx_packed_neon.h
index f19e618635..c222ebf00c 100644
--- a/drivers/net/virtio/virtio_rxtx_packed_neon.h
+++ b/drivers/net/virtio/virtio_rxtx_packed_neon.h
@@ -97,12 +97,12 @@ virtqueue_enqueue_batch_packed_vec(struct virtnet_tx *txvq,
uint64x2x2_t desc[PACKED_BATCH_SIZE / 2];
uint64x2_t base_addr0 = {
- tx_pkts[0]->buf_iova + tx_pkts[0]->data_off,
- tx_pkts[1]->buf_iova + tx_pkts[1]->data_off
+ VIRTIO_MBUF_ADDR(tx_pkts[0], vq) + tx_pkts[0]->data_off,
+ VIRTIO_MBUF_ADDR(tx_pkts[1], vq) + tx_pkts[1]->data_off
};
uint64x2_t base_addr1 = {
- tx_pkts[2]->buf_iova + tx_pkts[2]->data_off,
- tx_pkts[3]->buf_iova + tx_pkts[3]->data_off
+ VIRTIO_MBUF_ADDR(tx_pkts[2], vq) + tx_pkts[2]->data_off,
+ VIRTIO_MBUF_ADDR(tx_pkts[3], vq) + tx_pkts[3]->data_off
};
desc[0].val[0] = base_addr0;
diff --git a/drivers/net/virtio/virtio_rxtx_simple.h b/drivers/net/virtio/virtio_rxtx_simple.h
index f258771fcf..497c9a0e32 100644
--- a/drivers/net/virtio/virtio_rxtx_simple.h
+++ b/drivers/net/virtio/virtio_rxtx_simple.h
@@ -43,7 +43,8 @@ virtio_rxq_rearm_vec(struct virtnet_rx *rxvq)
p = (uintptr_t)&sw_ring[i]->rearm_data;
*(uint64_t *)p = rxvq->mbuf_initializer;
- start_dp[i].addr = sw_ring[i]->buf_iova +
+ start_dp[i].addr =
+ VIRTIO_MBUF_ADDR(sw_ring[i], vq) +
RTE_PKTMBUF_HEADROOM - vq->hw->vtnet_hdr_size;
start_dp[i].len = sw_ring[i]->buf_len -
RTE_PKTMBUF_HEADROOM + vq->hw->vtnet_hdr_size;
diff --git a/drivers/net/virtio/virtio_user_ethdev.c b/drivers/net/virtio/virtio_user_ethdev.c
index 688c1104d5..0271098f0d 100644
--- a/drivers/net/virtio/virtio_user_ethdev.c
+++ b/drivers/net/virtio/virtio_user_ethdev.c
@@ -657,6 +657,12 @@ virtio_user_pmd_probe(struct rte_vdev_device *vdev)
goto end;
}
+ /*
+ * Virtio-user requires using virtual addresses for the descriptors
+ * buffers, whatever other devices require
+ */
+ hw->use_va = true;
+
/* previously called by pci probing for physical dev */
if (eth_virtio_dev_init(eth_dev) < 0) {
PMD_INIT_LOG(ERR, "eth_virtio_dev_init fails");
@@ -769,7 +775,6 @@ static struct rte_vdev_driver virtio_user_driver = {
.remove = virtio_user_pmd_remove,
.dma_map = virtio_user_pmd_dma_map,
.dma_unmap = virtio_user_pmd_dma_unmap,
- .drv_flags = RTE_VDEV_DRV_NEED_IOVA_AS_VA,
};
RTE_PMD_REGISTER_VDEV(net_virtio_user, virtio_user_driver);
diff --git a/drivers/net/virtio/virtqueue.h b/drivers/net/virtio/virtqueue.h
index bee03182d6..8780b7f27a 100644
--- a/drivers/net/virtio/virtqueue.h
+++ b/drivers/net/virtio/virtqueue.h
@@ -113,6 +113,25 @@ virtqueue_store_flags_packed(struct vring_packed_desc *dp,
#define VIRTQUEUE_MAX_NAME_SZ 32
+/**
+ * Return the IOVA (or virtual address in case of virtio-user) of mbuf
+ * data buffer.
+ *
+ * The address is firstly casted to the word size (sizeof(uintptr_t))
+ * before casting it to uint64_t. This is to make it work with different
+ * combination of word size (64 bit and 32 bit) and virtio device
+ * (virtio-pci and virtio-user).
+ */
+#define VIRTIO_MBUF_ADDR(mb, vq) \
+ ((uint64_t)(*(uintptr_t *)((uintptr_t)(mb) + (vq)->mbuf_addr_offset)))
+
+/**
+ * Return the physical address (or virtual address in case of
+ * virtio-user) of mbuf data buffer, taking care of mbuf data offset
+ */
+#define VIRTIO_MBUF_DATA_DMA_ADDR(mb, vq) \
+ (VIRTIO_MBUF_ADDR(mb, vq) + (mb)->data_off)
+
#define VTNET_SQ_RQ_QUEUE_IDX 0
#define VTNET_SQ_TQ_QUEUE_IDX 1
#define VTNET_SQ_CQ_QUEUE_IDX 2
@@ -273,6 +292,7 @@ struct virtqueue {
void *vq_ring_virt_mem; /**< linear address of vring*/
unsigned int vq_ring_size;
+ uint16_t mbuf_addr_offset;
union {
struct virtnet_rx rxq;
@@ -760,7 +780,7 @@ virtqueue_enqueue_xmit_packed(struct virtnet_tx *txvq, struct rte_mbuf *cookie,
do {
uint16_t flags;
- start_dp[idx].addr = rte_mbuf_data_iova(cookie);
+ start_dp[idx].addr = VIRTIO_MBUF_DATA_DMA_ADDR(cookie, vq);
start_dp[idx].len = cookie->data_len;
if (prepend_header) {
start_dp[idx].addr -= head_size;
--
2.31.1
next reply other threads:[~2021-09-29 20:18 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-09-29 20:17 Maxime Coquelin [this message]
2021-09-29 21:15 ` Olivier Matz
2021-09-30 8:25 ` Maxime Coquelin
2021-09-30 7:26 ` David Marchand
2021-09-30 7:43 ` Maxime Coquelin
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20210929201739.176306-1-maxime.coquelin@redhat.com \
--to=maxime.coquelin@redhat.com \
--cc=chenbo.xia@intel.com \
--cc=david.marchand@redhat.com \
--cc=dev@dpdk.org \
--cc=olivier.matz@6wind.com \
--cc=stable@dpdk.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).