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virtio_rxtx.c
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virtio_rxtx.c
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/* SPDX-License-Identifier: BSD-3-Clause
* Copyright(c) 2010-2014 Intel Corporation
*/
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <rte_cycles.h>
#include <rte_memory.h>
#include <rte_branch_prediction.h>
#include <rte_mempool.h>
#include <rte_malloc.h>
#include <rte_mbuf.h>
#include <rte_ether.h>
#include <rte_ethdev_driver.h>
#include <rte_prefetch.h>
#include <rte_string_fns.h>
#include <rte_errno.h>
#include <rte_byteorder.h>
#include <rte_net.h>
#include <rte_ip.h>
#include <rte_udp.h>
#include <rte_tcp.h>
#include "virtio_logs.h"
#include "virtio_ethdev.h"
#include "virtio_pci.h"
#include "virtqueue.h"
#include "virtio_rxtx.h"
#include "virtio_rxtx_simple.h"
#ifdef RTE_LIBRTE_VIRTIO_DEBUG_DUMP
#define VIRTIO_DUMP_PACKET(m, len) rte_pktmbuf_dump(stdout, m, len)
#else
#define VIRTIO_DUMP_PACKET(m, len) do { } while (0)
#endif
int
virtio_dev_rx_queue_done(void *rxq, uint16_t offset)
{
struct virtnet_rx *rxvq = rxq;
struct virtqueue *vq = rxvq->vq;
return VIRTQUEUE_NUSED(vq) >= offset;
}
void
vq_ring_free_inorder(struct virtqueue *vq, uint16_t desc_idx, uint16_t num)
{
vq->vq_free_cnt += num;
vq->vq_desc_tail_idx = desc_idx & (vq->vq_nentries - 1);
}
void
vq_ring_free_chain(struct virtqueue *vq, uint16_t desc_idx)
{
struct vring_desc *dp, *dp_tail;
struct vq_desc_extra *dxp;
uint16_t desc_idx_last = desc_idx;
dp = &vq->vq_ring.desc[desc_idx];
dxp = &vq->vq_descx[desc_idx];
vq->vq_free_cnt = (uint16_t)(vq->vq_free_cnt + dxp->ndescs);
if ((dp->flags & VRING_DESC_F_INDIRECT) == 0) {
while (dp->flags & VRING_DESC_F_NEXT) {
desc_idx_last = dp->next;
dp = &vq->vq_ring.desc[dp->next];
}
}
dxp->ndescs = 0;
/*
* We must append the existing free chain, if any, to the end of
* newly freed chain. If the virtqueue was completely used, then
* head would be VQ_RING_DESC_CHAIN_END (ASSERTed above).
*/
if (vq->vq_desc_tail_idx == VQ_RING_DESC_CHAIN_END) {
vq->vq_desc_head_idx = desc_idx;
} else {
dp_tail = &vq->vq_ring.desc[vq->vq_desc_tail_idx];
dp_tail->next = desc_idx;
}
vq->vq_desc_tail_idx = desc_idx_last;
dp->next = VQ_RING_DESC_CHAIN_END;
}
static uint16_t
virtqueue_dequeue_burst_rx(struct virtqueue *vq, struct rte_mbuf **rx_pkts,
uint32_t *len, uint16_t num)
{
struct vring_used_elem *uep;
struct rte_mbuf *cookie;
uint16_t used_idx, desc_idx;
uint16_t i;
/* Caller does the check */
for (i = 0; i < num ; i++) {
used_idx = (uint16_t)(vq->vq_used_cons_idx & (vq->vq_nentries - 1));
uep = &vq->vq_ring.used->ring[used_idx];
desc_idx = (uint16_t) uep->id;
len[i] = uep->len;
cookie = (struct rte_mbuf *)vq->vq_descx[desc_idx].cookie;
if (unlikely(cookie == NULL)) {
PMD_DRV_LOG(ERR, "vring descriptor with no mbuf cookie at %u",
vq->vq_used_cons_idx);
break;
}
rte_prefetch0(cookie);
rte_packet_prefetch(rte_pktmbuf_mtod(cookie, void *));
rx_pkts[i] = cookie;
vq->vq_used_cons_idx++;
vq_ring_free_chain(vq, desc_idx);
vq->vq_descx[desc_idx].cookie = NULL;
}
return i;
}
static uint16_t
virtqueue_dequeue_rx_inorder(struct virtqueue *vq,
struct rte_mbuf **rx_pkts,
uint32_t *len,
uint16_t num)
{
struct vring_used_elem *uep;
struct rte_mbuf *cookie;
uint16_t used_idx = 0;
uint16_t i;
if (unlikely(num == 0))
return 0;
for (i = 0; i < num; i++) {
used_idx = vq->vq_used_cons_idx & (vq->vq_nentries - 1);
/* Desc idx same as used idx */
uep = &vq->vq_ring.used->ring[used_idx];
len[i] = uep->len;
cookie = (struct rte_mbuf *)vq->vq_descx[used_idx].cookie;
if (unlikely(cookie == NULL)) {
PMD_DRV_LOG(ERR, "vring descriptor with no mbuf cookie at %u",
vq->vq_used_cons_idx);
break;
}
rte_prefetch0(cookie);
rte_packet_prefetch(rte_pktmbuf_mtod(cookie, void *));
rx_pkts[i] = cookie;
vq->vq_used_cons_idx++;
vq->vq_descx[used_idx].cookie = NULL;
}
vq_ring_free_inorder(vq, used_idx, i);
return i;
}
#ifndef DEFAULT_TX_FREE_THRESH
#define DEFAULT_TX_FREE_THRESH 32
#endif
/* Cleanup from completed transmits. */
static void
virtio_xmit_cleanup(struct virtqueue *vq, uint16_t num)
{
uint16_t i, used_idx, desc_idx;
for (i = 0; i < num; i++) {
struct vring_used_elem *uep;
struct vq_desc_extra *dxp;
used_idx = (uint16_t)(vq->vq_used_cons_idx & (vq->vq_nentries - 1));
uep = &vq->vq_ring.used->ring[used_idx];
desc_idx = (uint16_t) uep->id;
dxp = &vq->vq_descx[desc_idx];
vq->vq_used_cons_idx++;
vq_ring_free_chain(vq, desc_idx);
if (dxp->cookie != NULL) {
rte_pktmbuf_free(dxp->cookie);
dxp->cookie = NULL;
}
}
}
/* Cleanup from completed inorder transmits. */
static void
virtio_xmit_cleanup_inorder(struct virtqueue *vq, uint16_t num)
{
uint16_t i, idx = vq->vq_used_cons_idx;
int16_t free_cnt = 0;
struct vq_desc_extra *dxp = NULL;
if (unlikely(num == 0))
return;
for (i = 0; i < num; i++) {
dxp = &vq->vq_descx[idx++ & (vq->vq_nentries - 1)];
free_cnt += dxp->ndescs;
if (dxp->cookie != NULL) {
rte_pktmbuf_free(dxp->cookie);
dxp->cookie = NULL;
}
}
vq->vq_free_cnt += free_cnt;
vq->vq_used_cons_idx = idx;
}
static inline int
virtqueue_enqueue_refill_inorder(struct virtqueue *vq,
struct rte_mbuf **cookies,
uint16_t num)
{
struct vq_desc_extra *dxp;
struct virtio_hw *hw = vq->hw;
struct vring_desc *start_dp;
uint16_t head_idx, idx, i = 0;
if (unlikely(vq->vq_free_cnt == 0))
return -ENOSPC;
if (unlikely(vq->vq_free_cnt < num))
return -EMSGSIZE;
head_idx = vq->vq_desc_head_idx & (vq->vq_nentries - 1);
start_dp = vq->vq_ring.desc;
while (i < num) {
idx = head_idx & (vq->vq_nentries - 1);
dxp = &vq->vq_descx[idx];
dxp->cookie = (void *)cookies[i];
dxp->ndescs = 1;
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);
head_idx++;
i++;
}
vq->vq_desc_head_idx += num;
vq->vq_free_cnt = (uint16_t)(vq->vq_free_cnt - num);
return 0;
}
static inline int
virtqueue_enqueue_recv_refill(struct virtqueue *vq, struct rte_mbuf *cookie)
{
struct vq_desc_extra *dxp;
struct virtio_hw *hw = vq->hw;
struct vring_desc *start_dp;
uint16_t needed = 1;
uint16_t head_idx, idx;
if (unlikely(vq->vq_free_cnt == 0))
return -ENOSPC;
if (unlikely(vq->vq_free_cnt < needed))
return -EMSGSIZE;
head_idx = vq->vq_desc_head_idx;
if (unlikely(head_idx >= vq->vq_nentries))
return -EFAULT;
idx = head_idx;
dxp = &vq->vq_descx[idx];
dxp->cookie = (void *)cookie;
dxp->ndescs = needed;
start_dp = vq->vq_ring.desc;
start_dp[idx].addr =
VIRTIO_MBUF_ADDR(cookie, vq) +
RTE_PKTMBUF_HEADROOM - hw->vtnet_hdr_size;
start_dp[idx].len =
cookie->buf_len - RTE_PKTMBUF_HEADROOM + hw->vtnet_hdr_size;
start_dp[idx].flags = VRING_DESC_F_WRITE;
idx = start_dp[idx].next;
vq->vq_desc_head_idx = idx;
if (vq->vq_desc_head_idx == VQ_RING_DESC_CHAIN_END)
vq->vq_desc_tail_idx = idx;
vq->vq_free_cnt = (uint16_t)(vq->vq_free_cnt - needed);
vq_update_avail_ring(vq, head_idx);
return 0;
}
/* When doing TSO, the IP length is not included in the pseudo header
* checksum of the packet given to the PMD, but for virtio it is
* expected.
*/
static void
virtio_tso_fix_cksum(struct rte_mbuf *m)
{
/* common case: header is not fragmented */
if (likely(rte_pktmbuf_data_len(m) >= m->l2_len + m->l3_len +
m->l4_len)) {
struct ipv4_hdr *iph;
struct ipv6_hdr *ip6h;
struct tcp_hdr *th;
uint16_t prev_cksum, new_cksum, ip_len, ip_paylen;
uint32_t tmp;
iph = rte_pktmbuf_mtod_offset(m, struct ipv4_hdr *, m->l2_len);
th = RTE_PTR_ADD(iph, m->l3_len);
if ((iph->version_ihl >> 4) == 4) {
iph->hdr_checksum = 0;
iph->hdr_checksum = rte_ipv4_cksum(iph);
ip_len = iph->total_length;
ip_paylen = rte_cpu_to_be_16(rte_be_to_cpu_16(ip_len) -
m->l3_len);
} else {
ip6h = (struct ipv6_hdr *)iph;
ip_paylen = ip6h->payload_len;
}
/* calculate the new phdr checksum not including ip_paylen */
prev_cksum = th->cksum;
tmp = prev_cksum;
tmp += ip_paylen;
tmp = (tmp & 0xffff) + (tmp >> 16);
new_cksum = tmp;
/* replace it in the packet */
th->cksum = new_cksum;
}
}
/* avoid write operation when necessary, to lessen cache issues */
#define ASSIGN_UNLESS_EQUAL(var, val) do { \
if ((var) != (val)) \
(var) = (val); \
} while (0)
static inline void
virtqueue_xmit_offload(struct virtio_net_hdr *hdr,
struct rte_mbuf *cookie,
bool offload)
{
if (offload) {
if (cookie->ol_flags & PKT_TX_TCP_SEG)
cookie->ol_flags |= PKT_TX_TCP_CKSUM;
switch (cookie->ol_flags & PKT_TX_L4_MASK) {
case PKT_TX_UDP_CKSUM:
hdr->csum_start = cookie->l2_len + cookie->l3_len;
hdr->csum_offset = offsetof(struct udp_hdr,
dgram_cksum);
hdr->flags = VIRTIO_NET_HDR_F_NEEDS_CSUM;
break;
case PKT_TX_TCP_CKSUM:
hdr->csum_start = cookie->l2_len + cookie->l3_len;
hdr->csum_offset = offsetof(struct tcp_hdr, cksum);
hdr->flags = VIRTIO_NET_HDR_F_NEEDS_CSUM;
break;
default:
ASSIGN_UNLESS_EQUAL(hdr->csum_start, 0);
ASSIGN_UNLESS_EQUAL(hdr->csum_offset, 0);
ASSIGN_UNLESS_EQUAL(hdr->flags, 0);
break;
}
/* TCP Segmentation Offload */
if (cookie->ol_flags & PKT_TX_TCP_SEG) {
hdr->gso_type = (cookie->ol_flags & PKT_TX_IPV6) ?
VIRTIO_NET_HDR_GSO_TCPV6 :
VIRTIO_NET_HDR_GSO_TCPV4;
hdr->gso_size = cookie->tso_segsz;
hdr->hdr_len =
cookie->l2_len +
cookie->l3_len +
cookie->l4_len;
} else {
ASSIGN_UNLESS_EQUAL(hdr->gso_type, 0);
ASSIGN_UNLESS_EQUAL(hdr->gso_size, 0);
ASSIGN_UNLESS_EQUAL(hdr->hdr_len, 0);
}
}
}
static inline void
virtqueue_enqueue_xmit_inorder(struct virtnet_tx *txvq,
struct rte_mbuf **cookies,
uint16_t num)
{
struct vq_desc_extra *dxp;
struct virtqueue *vq = txvq->vq;
struct vring_desc *start_dp;
struct virtio_net_hdr *hdr;
uint16_t idx;
uint16_t head_size = vq->hw->vtnet_hdr_size;
uint16_t i = 0;
idx = vq->vq_desc_head_idx;
start_dp = vq->vq_ring.desc;
while (i < num) {
idx = idx & (vq->vq_nentries - 1);
dxp = &vq->vq_descx[vq->vq_avail_idx & (vq->vq_nentries - 1)];
dxp->cookie = (void *)cookies[i];
dxp->ndescs = 1;
hdr = rte_pktmbuf_mtod_offset(cookies[i],
struct virtio_net_hdr *, -head_size);
cookies[i]->pkt_len -= head_size;
/* if offload disabled, it is not zeroed below, do it now */
if (!vq->hw->has_tx_offload) {
ASSIGN_UNLESS_EQUAL(hdr->csum_start, 0);
ASSIGN_UNLESS_EQUAL(hdr->csum_offset, 0);
ASSIGN_UNLESS_EQUAL(hdr->flags, 0);
ASSIGN_UNLESS_EQUAL(hdr->gso_type, 0);
ASSIGN_UNLESS_EQUAL(hdr->gso_size, 0);
ASSIGN_UNLESS_EQUAL(hdr->hdr_len, 0);
}
virtqueue_xmit_offload(hdr, cookies[i],
vq->hw->has_tx_offload);
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;
vq_update_avail_ring(vq, idx);
idx++;
i++;
};
vq->vq_free_cnt = (uint16_t)(vq->vq_free_cnt - num);
vq->vq_desc_head_idx = idx & (vq->vq_nentries - 1);
}
static inline void
virtqueue_enqueue_xmit(struct virtnet_tx *txvq, struct rte_mbuf *cookie,
uint16_t needed, int use_indirect, int can_push,
int in_order)
{
struct virtio_tx_region *txr = txvq->virtio_net_hdr_mz->addr;
struct vq_desc_extra *dxp;
struct virtqueue *vq = txvq->vq;
struct vring_desc *start_dp;
uint16_t seg_num = cookie->nb_segs;
uint16_t head_idx, idx;
uint16_t head_size = vq->hw->vtnet_hdr_size;
bool prepend_header = false;
struct virtio_net_hdr *hdr;
head_idx = vq->vq_desc_head_idx;
idx = head_idx;
if (in_order)
dxp = &vq->vq_descx[vq->vq_avail_idx & (vq->vq_nentries - 1)];
else
dxp = &vq->vq_descx[idx];
dxp->cookie = (void *)cookie;
dxp->ndescs = needed;
start_dp = vq->vq_ring.desc;
if (can_push) {
/* prepend cannot fail, checked by caller */
hdr = rte_pktmbuf_mtod_offset(cookie, struct virtio_net_hdr *,
-head_size);
prepend_header = true;
/* if offload disabled, it is not zeroed below, do it now */
if (!vq->hw->has_tx_offload) {
ASSIGN_UNLESS_EQUAL(hdr->csum_start, 0);
ASSIGN_UNLESS_EQUAL(hdr->csum_offset, 0);
ASSIGN_UNLESS_EQUAL(hdr->flags, 0);
ASSIGN_UNLESS_EQUAL(hdr->gso_type, 0);
ASSIGN_UNLESS_EQUAL(hdr->gso_size, 0);
ASSIGN_UNLESS_EQUAL(hdr->hdr_len, 0);
}
} else if (use_indirect) {
/* setup tx ring slot to point to indirect
* descriptor list stored in reserved region.
*
* the first slot in indirect ring is already preset
* to point to the header in reserved region
*/
start_dp[idx].addr = txvq->virtio_net_hdr_mem +
RTE_PTR_DIFF(&txr[idx].tx_indir, txr);
start_dp[idx].len = (seg_num + 1) * sizeof(struct vring_desc);
start_dp[idx].flags = VRING_DESC_F_INDIRECT;
hdr = (struct virtio_net_hdr *)&txr[idx].tx_hdr;
/* loop below will fill in rest of the indirect elements */
start_dp = txr[idx].tx_indir;
idx = 1;
} else {
/* setup first tx ring slot to point to header
* stored in reserved region.
*/
start_dp[idx].addr = txvq->virtio_net_hdr_mem +
RTE_PTR_DIFF(&txr[idx].tx_hdr, txr);
start_dp[idx].len = vq->hw->vtnet_hdr_size;
start_dp[idx].flags = VRING_DESC_F_NEXT;
hdr = (struct virtio_net_hdr *)&txr[idx].tx_hdr;
idx = start_dp[idx].next;
}
virtqueue_xmit_offload(hdr, cookie, vq->hw->has_tx_offload);
do {
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;
start_dp[idx].len += head_size;
prepend_header = false;
}
start_dp[idx].flags = cookie->next ? VRING_DESC_F_NEXT : 0;
idx = start_dp[idx].next;
} while ((cookie = cookie->next) != NULL);
if (use_indirect)
idx = vq->vq_ring.desc[head_idx].next;
vq->vq_free_cnt = (uint16_t)(vq->vq_free_cnt - needed);
vq->vq_desc_head_idx = idx;
vq_update_avail_ring(vq, head_idx);
if (!in_order) {
if (vq->vq_desc_head_idx == VQ_RING_DESC_CHAIN_END)
vq->vq_desc_tail_idx = idx;
}
}
void
virtio_dev_cq_start(struct rte_eth_dev *dev)
{
struct virtio_hw *hw = dev->data->dev_private;
if (hw->cvq && hw->cvq->vq) {
rte_spinlock_init(&hw->cvq->lock);
VIRTQUEUE_DUMP((struct virtqueue *)hw->cvq->vq);
}
}
int
virtio_dev_rx_queue_setup(struct rte_eth_dev *dev,
uint16_t queue_idx,
uint16_t nb_desc,
unsigned int socket_id __rte_unused,
const struct rte_eth_rxconf *rx_conf,
struct rte_mempool *mp)
{
uint16_t vtpci_queue_idx = 2 * queue_idx + VTNET_SQ_RQ_QUEUE_IDX;
struct virtio_hw *hw = dev->data->dev_private;
struct virtqueue *vq = hw->vqs[vtpci_queue_idx];
struct virtnet_rx *rxvq;
PMD_INIT_FUNC_TRACE();
if (rx_conf->rx_deferred_start) {
PMD_INIT_LOG(ERR, "Rx deferred start is not supported");
return -EINVAL;
}
if (nb_desc == 0 || nb_desc > vq->vq_nentries)
nb_desc = vq->vq_nentries;
vq->vq_free_cnt = RTE_MIN(vq->vq_free_cnt, nb_desc);
rxvq = &vq->rxq;
rxvq->queue_id = queue_idx;
rxvq->mpool = mp;
dev->data->rx_queues[queue_idx] = rxvq;
return 0;
}
int
virtio_dev_rx_queue_setup_finish(struct rte_eth_dev *dev, uint16_t queue_idx)
{
uint16_t vtpci_queue_idx = 2 * queue_idx + VTNET_SQ_RQ_QUEUE_IDX;
struct virtio_hw *hw = dev->data->dev_private;
struct virtqueue *vq = hw->vqs[vtpci_queue_idx];
struct virtnet_rx *rxvq = &vq->rxq;
struct rte_mbuf *m;
uint16_t desc_idx;
int error, nbufs, i;
PMD_INIT_FUNC_TRACE();
/* Allocate blank mbufs for the each rx descriptor */
nbufs = 0;
if (hw->use_simple_rx) {
for (desc_idx = 0; desc_idx < vq->vq_nentries;
desc_idx++) {
vq->vq_ring.avail->ring[desc_idx] = desc_idx;
vq->vq_ring.desc[desc_idx].flags =
VRING_DESC_F_WRITE;
}
virtio_rxq_vec_setup(rxvq);
}
memset(&rxvq->fake_mbuf, 0, sizeof(rxvq->fake_mbuf));
for (desc_idx = 0; desc_idx < RTE_PMD_VIRTIO_RX_MAX_BURST;
desc_idx++) {
vq->sw_ring[vq->vq_nentries + desc_idx] =
&rxvq->fake_mbuf;
}
if (hw->use_simple_rx) {
while (vq->vq_free_cnt >= RTE_VIRTIO_VPMD_RX_REARM_THRESH) {
virtio_rxq_rearm_vec(rxvq);
nbufs += RTE_VIRTIO_VPMD_RX_REARM_THRESH;
}
} else if (hw->use_inorder_rx) {
if ((!virtqueue_full(vq))) {
uint16_t free_cnt = vq->vq_free_cnt;
struct rte_mbuf *pkts[free_cnt];
if (!rte_pktmbuf_alloc_bulk(rxvq->mpool, pkts,
free_cnt)) {
error = virtqueue_enqueue_refill_inorder(vq,
pkts,
free_cnt);
if (unlikely(error)) {
for (i = 0; i < free_cnt; i++)
rte_pktmbuf_free(pkts[i]);
}
}
nbufs += free_cnt;
vq_update_avail_idx(vq);
}
} else {
while (!virtqueue_full(vq)) {
m = rte_mbuf_raw_alloc(rxvq->mpool);
if (m == NULL)
break;
/* Enqueue allocated buffers */
error = virtqueue_enqueue_recv_refill(vq, m);
if (error) {
rte_pktmbuf_free(m);
break;
}
nbufs++;
}
vq_update_avail_idx(vq);
}
PMD_INIT_LOG(DEBUG, "Allocated %d bufs", nbufs);
VIRTQUEUE_DUMP(vq);
return 0;
}
/*
* struct rte_eth_dev *dev: Used to update dev
* uint16_t nb_desc: Defaults to values read from config space
* unsigned int socket_id: Used to allocate memzone
* const struct rte_eth_txconf *tx_conf: Used to setup tx engine
* uint16_t queue_idx: Just used as an index in dev txq list
*/
int
virtio_dev_tx_queue_setup(struct rte_eth_dev *dev,
uint16_t queue_idx,
uint16_t nb_desc,
unsigned int socket_id __rte_unused,
const struct rte_eth_txconf *tx_conf)
{
uint8_t vtpci_queue_idx = 2 * queue_idx + VTNET_SQ_TQ_QUEUE_IDX;
struct virtio_hw *hw = dev->data->dev_private;
struct virtqueue *vq = hw->vqs[vtpci_queue_idx];
struct virtnet_tx *txvq;
uint16_t tx_free_thresh;
PMD_INIT_FUNC_TRACE();
if (tx_conf->tx_deferred_start) {
PMD_INIT_LOG(ERR, "Tx deferred start is not supported");
return -EINVAL;
}
if (nb_desc == 0 || nb_desc > vq->vq_nentries)
nb_desc = vq->vq_nentries;
vq->vq_free_cnt = RTE_MIN(vq->vq_free_cnt, nb_desc);
txvq = &vq->txq;
txvq->queue_id = queue_idx;
tx_free_thresh = tx_conf->tx_free_thresh;
if (tx_free_thresh == 0)
tx_free_thresh =
RTE_MIN(vq->vq_nentries / 4, DEFAULT_TX_FREE_THRESH);
if (tx_free_thresh >= (vq->vq_nentries - 3)) {
PMD_DRV_LOG(ERR, "tx_free_thresh must be less than the "
"number of TX entries minus 3 (%u)."
" (tx_free_thresh=%u port=%u queue=%u)\n",
vq->vq_nentries - 3,
tx_free_thresh, dev->data->port_id, queue_idx);
return -EINVAL;
}
vq->vq_free_thresh = tx_free_thresh;
dev->data->tx_queues[queue_idx] = txvq;
return 0;
}
int
virtio_dev_tx_queue_setup_finish(struct rte_eth_dev *dev,
uint16_t queue_idx)
{
uint8_t vtpci_queue_idx = 2 * queue_idx + VTNET_SQ_TQ_QUEUE_IDX;
struct virtio_hw *hw = dev->data->dev_private;
struct virtqueue *vq = hw->vqs[vtpci_queue_idx];
PMD_INIT_FUNC_TRACE();
if (hw->use_inorder_tx)
vq->vq_ring.desc[vq->vq_nentries - 1].next = 0;
VIRTQUEUE_DUMP(vq);
return 0;
}
static void
virtio_discard_rxbuf(struct virtqueue *vq, struct rte_mbuf *m)
{
int error;
/*
* Requeue the discarded mbuf. This should always be
* successful since it was just dequeued.
*/
error = virtqueue_enqueue_recv_refill(vq, m);
if (unlikely(error)) {
PMD_DRV_LOG(ERR, "cannot requeue discarded mbuf");
rte_pktmbuf_free(m);
}
}
static void
virtio_discard_rxbuf_inorder(struct virtqueue *vq, struct rte_mbuf *m)
{
int error;
error = virtqueue_enqueue_refill_inorder(vq, &m, 1);
if (unlikely(error)) {
PMD_DRV_LOG(ERR, "cannot requeue discarded mbuf");
rte_pktmbuf_free(m);
}
}
void
virtio_update_packet_stats(struct virtnet_stats *stats, struct rte_mbuf *mbuf)
{
uint32_t s = mbuf->pkt_len;
struct ether_addr *ea;
if (s == 64) {
stats->size_bins[1]++;
} else if (s > 64 && s < 1024) {
uint32_t bin;
/* count zeros, and offset into correct bin */
bin = (sizeof(s) * 8) - __builtin_clz(s) - 5;
stats->size_bins[bin]++;
} else {
if (s < 64)
stats->size_bins[0]++;
else if (s < 1519)
stats->size_bins[6]++;
else
stats->size_bins[7]++;
}
ea = rte_pktmbuf_mtod(mbuf, struct ether_addr *);
if (is_multicast_ether_addr(ea)) {
if (is_broadcast_ether_addr(ea))
stats->broadcast++;
else
stats->multicast++;
}
}
static inline void
virtio_rx_stats_updated(struct virtnet_rx *rxvq, struct rte_mbuf *m)
{
VIRTIO_DUMP_PACKET(m, m->data_len);
rxvq->stats.bytes += m->pkt_len;
virtio_update_packet_stats(&rxvq->stats, m);
}
/* Optionally fill offload information in structure */
static int
virtio_rx_offload(struct rte_mbuf *m, struct virtio_net_hdr *hdr)
{
struct rte_net_hdr_lens hdr_lens;
uint32_t hdrlen, ptype;
int l4_supported = 0;
/* nothing to do */
if (hdr->flags == 0 && hdr->gso_type == VIRTIO_NET_HDR_GSO_NONE)
return 0;
m->ol_flags |= PKT_RX_IP_CKSUM_UNKNOWN;
ptype = rte_net_get_ptype(m, &hdr_lens, RTE_PTYPE_ALL_MASK);
m->packet_type = ptype;
if ((ptype & RTE_PTYPE_L4_MASK) == RTE_PTYPE_L4_TCP ||
(ptype & RTE_PTYPE_L4_MASK) == RTE_PTYPE_L4_UDP ||
(ptype & RTE_PTYPE_L4_MASK) == RTE_PTYPE_L4_SCTP)
l4_supported = 1;
if (hdr->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) {
hdrlen = hdr_lens.l2_len + hdr_lens.l3_len + hdr_lens.l4_len;
if (hdr->csum_start <= hdrlen && l4_supported) {
m->ol_flags |= PKT_RX_L4_CKSUM_NONE;
} else {
/* Unknown proto or tunnel, do sw cksum. We can assume
* the cksum field is in the first segment since the
* buffers we provided to the host are large enough.
* In case of SCTP, this will be wrong since it's a CRC
* but there's nothing we can do.
*/
uint16_t csum = 0, off;
rte_raw_cksum_mbuf(m, hdr->csum_start,
rte_pktmbuf_pkt_len(m) - hdr->csum_start,
&csum);
if (likely(csum != 0xffff))
csum = ~csum;
off = hdr->csum_offset + hdr->csum_start;
if (rte_pktmbuf_data_len(m) >= off + 1)
*rte_pktmbuf_mtod_offset(m, uint16_t *,
off) = csum;
}
} else if (hdr->flags & VIRTIO_NET_HDR_F_DATA_VALID && l4_supported) {
m->ol_flags |= PKT_RX_L4_CKSUM_GOOD;
}
/* GSO request, save required information in mbuf */
if (hdr->gso_type != VIRTIO_NET_HDR_GSO_NONE) {
/* Check unsupported modes */
if ((hdr->gso_type & VIRTIO_NET_HDR_GSO_ECN) ||
(hdr->gso_size == 0)) {
return -EINVAL;
}
/* Update mss lengthes in mbuf */
m->tso_segsz = hdr->gso_size;
switch (hdr->gso_type & ~VIRTIO_NET_HDR_GSO_ECN) {
case VIRTIO_NET_HDR_GSO_TCPV4:
case VIRTIO_NET_HDR_GSO_TCPV6:
m->ol_flags |= PKT_RX_LRO | \
PKT_RX_L4_CKSUM_NONE;
break;
default:
return -EINVAL;
}
}
return 0;
}
#define VIRTIO_MBUF_BURST_SZ 64
#define DESC_PER_CACHELINE (RTE_CACHE_LINE_SIZE / sizeof(struct vring_desc))
uint16_t
virtio_recv_pkts(void *rx_queue, struct rte_mbuf **rx_pkts, uint16_t nb_pkts)
{
struct virtnet_rx *rxvq = rx_queue;
struct virtqueue *vq = rxvq->vq;
struct virtio_hw *hw = vq->hw;
struct rte_mbuf *rxm, *new_mbuf;
uint16_t nb_used, num, nb_rx;
uint32_t len[VIRTIO_MBUF_BURST_SZ];
struct rte_mbuf *rcv_pkts[VIRTIO_MBUF_BURST_SZ];
int error;
uint32_t i, nb_enqueued;
uint32_t hdr_size;
struct virtio_net_hdr *hdr;
nb_rx = 0;
if (unlikely(hw->started == 0))
return nb_rx;
nb_used = VIRTQUEUE_NUSED(vq);
virtio_rmb();
num = likely(nb_used <= nb_pkts) ? nb_used : nb_pkts;
if (unlikely(num > VIRTIO_MBUF_BURST_SZ))
num = VIRTIO_MBUF_BURST_SZ;
if (likely(num > DESC_PER_CACHELINE))
num = num - ((vq->vq_used_cons_idx + num) % DESC_PER_CACHELINE);
num = virtqueue_dequeue_burst_rx(vq, rcv_pkts, len, num);
PMD_RX_LOG(DEBUG, "used:%d dequeue:%d", nb_used, num);
nb_enqueued = 0;
hdr_size = hw->vtnet_hdr_size;
for (i = 0; i < num ; i++) {
rxm = rcv_pkts[i];
PMD_RX_LOG(DEBUG, "packet len:%d", len[i]);
if (unlikely(len[i] < hdr_size + ETHER_HDR_LEN)) {
PMD_RX_LOG(ERR, "Packet drop");
nb_enqueued++;
virtio_discard_rxbuf(vq, rxm);
rxvq->stats.errors++;
continue;
}
rxm->port = rxvq->port_id;
rxm->data_off = RTE_PKTMBUF_HEADROOM;
rxm->ol_flags = 0;
rxm->vlan_tci = 0;
rxm->pkt_len = (uint32_t)(len[i] - hdr_size);
rxm->data_len = (uint16_t)(len[i] - hdr_size);
hdr = (struct virtio_net_hdr *)((char *)rxm->buf_addr +
RTE_PKTMBUF_HEADROOM - hdr_size);
if (hw->vlan_strip)
rte_vlan_strip(rxm);
if (hw->has_rx_offload && virtio_rx_offload(rxm, hdr) < 0) {
virtio_discard_rxbuf(vq, rxm);
rxvq->stats.errors++;
continue;
}
virtio_rx_stats_updated(rxvq, rxm);
rx_pkts[nb_rx++] = rxm;
}
rxvq->stats.packets += nb_rx;
/* Allocate new mbuf for the used descriptor */
while (likely(!virtqueue_full(vq))) {
new_mbuf = rte_mbuf_raw_alloc(rxvq->mpool);
if (unlikely(new_mbuf == NULL)) {
struct rte_eth_dev *dev
= &rte_eth_devices[rxvq->port_id];
dev->data->rx_mbuf_alloc_failed++;
break;
}
error = virtqueue_enqueue_recv_refill(vq, new_mbuf);
if (unlikely(error)) {
rte_pktmbuf_free(new_mbuf);
break;
}
nb_enqueued++;
}
if (likely(nb_enqueued)) {
vq_update_avail_idx(vq);
if (unlikely(virtqueue_kick_prepare(vq))) {
virtqueue_notify(vq);
PMD_RX_LOG(DEBUG, "Notified");
}
}
return nb_rx;
}
uint16_t
virtio_recv_mergeable_pkts_inorder(void *rx_queue,
struct rte_mbuf **rx_pkts,
uint16_t nb_pkts)
{
struct virtnet_rx *rxvq = rx_queue;
struct virtqueue *vq = rxvq->vq;
struct virtio_hw *hw = vq->hw;
struct rte_mbuf *rxm;
struct rte_mbuf *prev = NULL;
uint16_t nb_used, num, nb_rx;