numam-dpdk/drivers/net/virtio/virtio_rxtx.c
Rich Lane 610e0a8b62 virtio: use zeroed memory for simple Tx header
For simple TX the virtio-net header must be zeroed, but it was using memory
that had been initialized with indirect descriptor tables. This resulted in
"unsupported gso type" errors from librte_vhost.

We can use the same memory for every descriptor to save cachelines in the
vswitch.

Fixes: 6dc5de3a ("virtio: use indirect ring elements")

Signed-off-by: Rich Lane <rich.lane@bigswitch.com>
Acked-by: Yuanhan Liu <yuanhan.liu@linux.intel.com>
Acked-by: Jianfeng Tan <jianfeng.tan@intel.com>
2016-04-06 12:27:57 +02:00

941 lines
24 KiB
C

/*-
* BSD LICENSE
*
* Copyright(c) 2010-2014 Intel Corporation. All rights reserved.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Intel Corporation nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#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_memzone.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.h>
#include <rte_prefetch.h>
#include <rte_string_fns.h>
#include <rte_errno.h>
#include <rte_byteorder.h>
#include "virtio_logs.h"
#include "virtio_ethdev.h"
#include "virtio_pci.h"
#include "virtqueue.h"
#include "virtio_rxtx.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
#define VIRTIO_SIMPLE_FLAGS ((uint32_t)ETH_TXQ_FLAGS_NOMULTSEGS | \
ETH_TXQ_FLAGS_NOOFFLOADS)
#ifdef RTE_MACHINE_CPUFLAG_SSSE3
static int use_simple_rxtx;
#endif
static 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\n",
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;
}
#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;
}
}
}
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 =
(uint64_t)(cookie->buf_physaddr + 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;
}
static inline void
virtqueue_enqueue_xmit(struct virtqueue *txvq, struct rte_mbuf *cookie,
uint16_t needed, int use_indirect, int can_push)
{
struct vq_desc_extra *dxp;
struct vring_desc *start_dp;
uint16_t seg_num = cookie->nb_segs;
uint16_t head_idx, idx;
uint16_t head_size = txvq->hw->vtnet_hdr_size;
unsigned long offs;
head_idx = txvq->vq_desc_head_idx;
idx = head_idx;
dxp = &txvq->vq_descx[idx];
dxp->cookie = (void *)cookie;
dxp->ndescs = needed;
start_dp = txvq->vq_ring.desc;
if (can_push) {
/* put on zero'd transmit header (no offloads) */
void *hdr = rte_pktmbuf_prepend(cookie, head_size);
memset(hdr, 0, head_size);
} 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
*/
struct virtio_tx_region *txr = txvq->virtio_net_hdr_mz->addr;
offs = idx * sizeof(struct virtio_tx_region)
+ offsetof(struct virtio_tx_region, tx_indir);
start_dp[idx].addr = txvq->virtio_net_hdr_mem + offs;
start_dp[idx].len = (seg_num + 1) * sizeof(struct vring_desc);
start_dp[idx].flags = VRING_DESC_F_INDIRECT;
/* 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.
*/
offs = idx * sizeof(struct virtio_tx_region)
+ offsetof(struct virtio_tx_region, tx_hdr);
start_dp[idx].addr = txvq->virtio_net_hdr_mem + offs;
start_dp[idx].len = txvq->hw->vtnet_hdr_size;
start_dp[idx].flags = VRING_DESC_F_NEXT;
idx = start_dp[idx].next;
}
do {
start_dp[idx].addr = rte_mbuf_data_dma_addr(cookie);
start_dp[idx].len = cookie->data_len;
start_dp[idx].flags = cookie->next ? VRING_DESC_F_NEXT : 0;
idx = start_dp[idx].next;
} while ((cookie = cookie->next) != NULL);
start_dp[idx].flags &= ~VRING_DESC_F_NEXT;
if (use_indirect)
idx = txvq->vq_ring.desc[head_idx].next;
txvq->vq_desc_head_idx = idx;
if (txvq->vq_desc_head_idx == VQ_RING_DESC_CHAIN_END)
txvq->vq_desc_tail_idx = idx;
txvq->vq_free_cnt = (uint16_t)(txvq->vq_free_cnt - needed);
vq_update_avail_ring(txvq, head_idx);
}
static inline struct rte_mbuf *
rte_rxmbuf_alloc(struct rte_mempool *mp)
{
struct rte_mbuf *m;
m = __rte_mbuf_raw_alloc(mp);
__rte_mbuf_sanity_check_raw(m, 0);
return m;
}
static void
virtio_dev_vring_start(struct virtqueue *vq, int queue_type)
{
struct rte_mbuf *m;
int i, nbufs, error, size = vq->vq_nentries;
struct vring *vr = &vq->vq_ring;
uint8_t *ring_mem = vq->vq_ring_virt_mem;
PMD_INIT_FUNC_TRACE();
/*
* Reinitialise since virtio port might have been stopped and restarted
*/
memset(vq->vq_ring_virt_mem, 0, vq->vq_ring_size);
vring_init(vr, size, ring_mem, VIRTIO_PCI_VRING_ALIGN);
vq->vq_used_cons_idx = 0;
vq->vq_desc_head_idx = 0;
vq->vq_avail_idx = 0;
vq->vq_desc_tail_idx = (uint16_t)(vq->vq_nentries - 1);
vq->vq_free_cnt = vq->vq_nentries;
memset(vq->vq_descx, 0, sizeof(struct vq_desc_extra) * vq->vq_nentries);
vring_desc_init(vr->desc, size);
/*
* Disable device(host) interrupting guest
*/
virtqueue_disable_intr(vq);
/* Only rx virtqueue needs mbufs to be allocated at initialization */
if (queue_type == VTNET_RQ) {
if (vq->mpool == NULL)
rte_exit(EXIT_FAILURE,
"Cannot allocate initial mbufs for rx virtqueue");
/* Allocate blank mbufs for the each rx descriptor */
nbufs = 0;
error = ENOSPC;
#ifdef RTE_MACHINE_CPUFLAG_SSSE3
if (use_simple_rxtx)
for (i = 0; i < vq->vq_nentries; i++) {
vq->vq_ring.avail->ring[i] = i;
vq->vq_ring.desc[i].flags = VRING_DESC_F_WRITE;
}
#endif
memset(&vq->fake_mbuf, 0, sizeof(vq->fake_mbuf));
for (i = 0; i < RTE_PMD_VIRTIO_RX_MAX_BURST; i++)
vq->sw_ring[vq->vq_nentries + i] = &vq->fake_mbuf;
while (!virtqueue_full(vq)) {
m = rte_rxmbuf_alloc(vq->mpool);
if (m == NULL)
break;
/******************************************
* Enqueue allocated buffers *
*******************************************/
#ifdef RTE_MACHINE_CPUFLAG_SSSE3
if (use_simple_rxtx)
error = virtqueue_enqueue_recv_refill_simple(vq, m);
else
#endif
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);
} else if (queue_type == VTNET_TQ) {
#ifdef RTE_MACHINE_CPUFLAG_SSSE3
if (use_simple_rxtx) {
int mid_idx = vq->vq_nentries >> 1;
for (i = 0; i < mid_idx; i++) {
vq->vq_ring.avail->ring[i] = i + mid_idx;
vq->vq_ring.desc[i + mid_idx].next = i;
vq->vq_ring.desc[i + mid_idx].addr =
vq->virtio_net_hdr_mem +
offsetof(struct virtio_tx_region, tx_hdr);
vq->vq_ring.desc[i + mid_idx].len =
vq->hw->vtnet_hdr_size;
vq->vq_ring.desc[i + mid_idx].flags =
VRING_DESC_F_NEXT;
vq->vq_ring.desc[i].flags = 0;
}
for (i = mid_idx; i < vq->vq_nentries; i++)
vq->vq_ring.avail->ring[i] = i;
}
#endif
}
}
void
virtio_dev_cq_start(struct rte_eth_dev *dev)
{
struct virtio_hw *hw = dev->data->dev_private;
if (hw->cvq) {
virtio_dev_vring_start(hw->cvq, VTNET_CQ);
VIRTQUEUE_DUMP((struct virtqueue *)hw->cvq);
}
}
void
virtio_dev_rxtx_start(struct rte_eth_dev *dev)
{
/*
* Start receive and transmit vrings
* - Setup vring structure for all queues
* - Initialize descriptor for the rx vring
* - Allocate blank mbufs for the each rx descriptor
*
*/
int i;
PMD_INIT_FUNC_TRACE();
/* Start rx vring. */
for (i = 0; i < dev->data->nb_rx_queues; i++) {
virtio_dev_vring_start(dev->data->rx_queues[i], VTNET_RQ);
VIRTQUEUE_DUMP((struct virtqueue *)dev->data->rx_queues[i]);
}
/* Start tx vring. */
for (i = 0; i < dev->data->nb_tx_queues; i++) {
virtio_dev_vring_start(dev->data->tx_queues[i], VTNET_TQ);
VIRTQUEUE_DUMP((struct virtqueue *)dev->data->tx_queues[i]);
}
}
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 virtqueue *vq;
int ret;
PMD_INIT_FUNC_TRACE();
ret = virtio_dev_queue_setup(dev, VTNET_RQ, queue_idx, vtpci_queue_idx,
nb_desc, socket_id, &vq);
if (ret < 0) {
PMD_INIT_LOG(ERR, "rvq initialization failed");
return ret;
}
/* Create mempool for rx mbuf allocation */
vq->mpool = mp;
dev->data->rx_queues[queue_idx] = vq;
#ifdef RTE_MACHINE_CPUFLAG_SSSE3
virtio_rxq_vec_setup(vq);
#endif
return 0;
}
void
virtio_dev_rx_queue_release(void *rxq)
{
virtio_dev_queue_release(rxq);
}
/*
* 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,
const struct rte_eth_txconf *tx_conf)
{
uint8_t vtpci_queue_idx = 2 * queue_idx + VTNET_SQ_TQ_QUEUE_IDX;
#ifdef RTE_MACHINE_CPUFLAG_SSSE3
struct virtio_hw *hw = dev->data->dev_private;
#endif
struct virtqueue *vq;
uint16_t tx_free_thresh;
int ret;
PMD_INIT_FUNC_TRACE();
if ((tx_conf->txq_flags & ETH_TXQ_FLAGS_NOXSUMS)
!= ETH_TXQ_FLAGS_NOXSUMS) {
PMD_INIT_LOG(ERR, "TX checksum offload not supported\n");
return -EINVAL;
}
#ifdef RTE_MACHINE_CPUFLAG_SSSE3
/* Use simple rx/tx func if single segment and no offloads */
if ((tx_conf->txq_flags & VIRTIO_SIMPLE_FLAGS) == VIRTIO_SIMPLE_FLAGS &&
!vtpci_with_feature(hw, VIRTIO_NET_F_MRG_RXBUF)) {
PMD_INIT_LOG(INFO, "Using simple rx/tx path");
dev->tx_pkt_burst = virtio_xmit_pkts_simple;
dev->rx_pkt_burst = virtio_recv_pkts_vec;
use_simple_rxtx = 1;
}
#endif
ret = virtio_dev_queue_setup(dev, VTNET_TQ, queue_idx, vtpci_queue_idx,
nb_desc, socket_id, &vq);
if (ret < 0) {
PMD_INIT_LOG(ERR, "rvq initialization failed");
return ret;
}
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)) {
RTE_LOG(ERR, PMD, "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] = vq;
return 0;
}
void
virtio_dev_tx_queue_release(void *txq)
{
virtio_dev_queue_release(txq);
}
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)) {
RTE_LOG(ERR, PMD, "cannot requeue discarded mbuf");
rte_pktmbuf_free(m);
}
}
static void
virtio_update_packet_stats(struct virtqueue *vq, struct rte_mbuf *mbuf)
{
uint32_t s = mbuf->pkt_len;
struct ether_addr *ea;
if (s == 64) {
vq->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;
vq->size_bins[bin]++;
} else {
if (s < 64)
vq->size_bins[0]++;
else if (s < 1519)
vq->size_bins[6]++;
else if (s >= 1519)
vq->size_bins[7]++;
}
ea = rte_pktmbuf_mtod(mbuf, struct ether_addr *);
if (is_multicast_ether_addr(ea)) {
if (is_broadcast_ether_addr(ea))
vq->broadcast++;
else
vq->multicast++;
}
}
#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 virtqueue *rxvq = rx_queue;
struct virtio_hw *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;
nb_used = VIRTQUEUE_NUSED(rxvq);
virtio_rmb();
num = (uint16_t)(likely(nb_used <= nb_pkts) ? nb_used : nb_pkts);
num = (uint16_t)(likely(num <= VIRTIO_MBUF_BURST_SZ) ? num : VIRTIO_MBUF_BURST_SZ);
if (likely(num > DESC_PER_CACHELINE))
num = num - ((rxvq->vq_used_cons_idx + num) % DESC_PER_CACHELINE);
num = virtqueue_dequeue_burst_rx(rxvq, rcv_pkts, len, num);
PMD_RX_LOG(DEBUG, "used:%d dequeue:%d", nb_used, num);
hw = rxvq->hw;
nb_rx = 0;
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(rxvq, rxm);
rxvq->errors++;
continue;
}
rxm->port = rxvq->port_id;
rxm->data_off = RTE_PKTMBUF_HEADROOM;
rxm->ol_flags = 0;
rxm->vlan_tci = 0;
rxm->nb_segs = 1;
rxm->next = NULL;
rxm->pkt_len = (uint32_t)(len[i] - hdr_size);
rxm->data_len = (uint16_t)(len[i] - hdr_size);
if (hw->vlan_strip)
rte_vlan_strip(rxm);
VIRTIO_DUMP_PACKET(rxm, rxm->data_len);
rx_pkts[nb_rx++] = rxm;
rxvq->bytes += rx_pkts[nb_rx - 1]->pkt_len;
virtio_update_packet_stats(rxvq, rxm);
}
rxvq->packets += nb_rx;
/* Allocate new mbuf for the used descriptor */
error = ENOSPC;
while (likely(!virtqueue_full(rxvq))) {
new_mbuf = rte_rxmbuf_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(rxvq, new_mbuf);
if (unlikely(error)) {
rte_pktmbuf_free(new_mbuf);
break;
}
nb_enqueued++;
}
if (likely(nb_enqueued)) {
vq_update_avail_idx(rxvq);
if (unlikely(virtqueue_kick_prepare(rxvq))) {
virtqueue_notify(rxvq);
PMD_RX_LOG(DEBUG, "Notified\n");
}
}
return nb_rx;
}
uint16_t
virtio_recv_mergeable_pkts(void *rx_queue,
struct rte_mbuf **rx_pkts,
uint16_t nb_pkts)
{
struct virtqueue *rxvq = rx_queue;
struct virtio_hw *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];
struct rte_mbuf *prev;
int error;
uint32_t i, nb_enqueued;
uint32_t seg_num;
uint16_t extra_idx;
uint32_t seg_res;
uint32_t hdr_size;
nb_used = VIRTQUEUE_NUSED(rxvq);
virtio_rmb();
PMD_RX_LOG(DEBUG, "used:%d\n", nb_used);
hw = rxvq->hw;
nb_rx = 0;
i = 0;
nb_enqueued = 0;
seg_num = 0;
extra_idx = 0;
seg_res = 0;
hdr_size = hw->vtnet_hdr_size;
while (i < nb_used) {
struct virtio_net_hdr_mrg_rxbuf *header;
if (nb_rx == nb_pkts)
break;
num = virtqueue_dequeue_burst_rx(rxvq, rcv_pkts, len, 1);
if (num != 1)
continue;
i++;
PMD_RX_LOG(DEBUG, "dequeue:%d\n", num);
PMD_RX_LOG(DEBUG, "packet len:%d\n", len[0]);
rxm = rcv_pkts[0];
if (unlikely(len[0] < hdr_size + ETHER_HDR_LEN)) {
PMD_RX_LOG(ERR, "Packet drop\n");
nb_enqueued++;
virtio_discard_rxbuf(rxvq, rxm);
rxvq->errors++;
continue;
}
header = (struct virtio_net_hdr_mrg_rxbuf *)((char *)rxm->buf_addr +
RTE_PKTMBUF_HEADROOM - hdr_size);
seg_num = header->num_buffers;
if (seg_num == 0)
seg_num = 1;
rxm->data_off = RTE_PKTMBUF_HEADROOM;
rxm->nb_segs = seg_num;
rxm->next = NULL;
rxm->ol_flags = 0;
rxm->vlan_tci = 0;
rxm->pkt_len = (uint32_t)(len[0] - hdr_size);
rxm->data_len = (uint16_t)(len[0] - hdr_size);
rxm->port = rxvq->port_id;
rx_pkts[nb_rx] = rxm;
prev = rxm;
seg_res = seg_num - 1;
while (seg_res != 0) {
/*
* Get extra segments for current uncompleted packet.
*/
uint16_t rcv_cnt =
RTE_MIN(seg_res, RTE_DIM(rcv_pkts));
if (likely(VIRTQUEUE_NUSED(rxvq) >= rcv_cnt)) {
uint32_t rx_num =
virtqueue_dequeue_burst_rx(rxvq,
rcv_pkts, len, rcv_cnt);
i += rx_num;
rcv_cnt = rx_num;
} else {
PMD_RX_LOG(ERR,
"No enough segments for packet.\n");
nb_enqueued++;
virtio_discard_rxbuf(rxvq, rxm);
rxvq->errors++;
break;
}
extra_idx = 0;
while (extra_idx < rcv_cnt) {
rxm = rcv_pkts[extra_idx];
rxm->data_off = RTE_PKTMBUF_HEADROOM - hdr_size;
rxm->next = NULL;
rxm->pkt_len = (uint32_t)(len[extra_idx]);
rxm->data_len = (uint16_t)(len[extra_idx]);
if (prev)
prev->next = rxm;
prev = rxm;
rx_pkts[nb_rx]->pkt_len += rxm->pkt_len;
extra_idx++;
};
seg_res -= rcv_cnt;
}
if (hw->vlan_strip)
rte_vlan_strip(rx_pkts[nb_rx]);
VIRTIO_DUMP_PACKET(rx_pkts[nb_rx],
rx_pkts[nb_rx]->data_len);
rxvq->bytes += rx_pkts[nb_rx]->pkt_len;
virtio_update_packet_stats(rxvq, rx_pkts[nb_rx]);
nb_rx++;
}
rxvq->packets += nb_rx;
/* Allocate new mbuf for the used descriptor */
error = ENOSPC;
while (likely(!virtqueue_full(rxvq))) {
new_mbuf = rte_rxmbuf_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(rxvq, new_mbuf);
if (unlikely(error)) {
rte_pktmbuf_free(new_mbuf);
break;
}
nb_enqueued++;
}
if (likely(nb_enqueued)) {
vq_update_avail_idx(rxvq);
if (unlikely(virtqueue_kick_prepare(rxvq))) {
virtqueue_notify(rxvq);
PMD_RX_LOG(DEBUG, "Notified");
}
}
return nb_rx;
}
uint16_t
virtio_xmit_pkts(void *tx_queue, struct rte_mbuf **tx_pkts, uint16_t nb_pkts)
{
struct virtqueue *txvq = tx_queue;
struct virtio_hw *hw = txvq->hw;
uint16_t hdr_size = hw->vtnet_hdr_size;
uint16_t nb_used, nb_tx;
int error;
if (unlikely(nb_pkts < 1))
return nb_pkts;
PMD_TX_LOG(DEBUG, "%d packets to xmit", nb_pkts);
nb_used = VIRTQUEUE_NUSED(txvq);
virtio_rmb();
if (likely(nb_used > txvq->vq_nentries - txvq->vq_free_thresh))
virtio_xmit_cleanup(txvq, nb_used);
for (nb_tx = 0; nb_tx < nb_pkts; nb_tx++) {
struct rte_mbuf *txm = tx_pkts[nb_tx];
int can_push = 0, use_indirect = 0, slots, need;
/* Do VLAN tag insertion */
if (unlikely(txm->ol_flags & PKT_TX_VLAN_PKT)) {
error = rte_vlan_insert(&txm);
if (unlikely(error)) {
rte_pktmbuf_free(txm);
continue;
}
}
/* optimize ring usage */
if (vtpci_with_feature(hw, VIRTIO_F_ANY_LAYOUT) &&
rte_mbuf_refcnt_read(txm) == 1 &&
txm->nb_segs == 1 &&
rte_pktmbuf_headroom(txm) >= hdr_size &&
rte_is_aligned(rte_pktmbuf_mtod(txm, char *),
__alignof__(struct virtio_net_hdr_mrg_rxbuf)))
can_push = 1;
else if (vtpci_with_feature(hw, VIRTIO_RING_F_INDIRECT_DESC) &&
txm->nb_segs < VIRTIO_MAX_TX_INDIRECT)
use_indirect = 1;
/* How many main ring entries are needed to this Tx?
* any_layout => number of segments
* indirect => 1
* default => number of segments + 1
*/
slots = use_indirect ? 1 : (txm->nb_segs + !can_push);
need = slots - txvq->vq_free_cnt;
/* Positive value indicates it need free vring descriptors */
if (unlikely(need > 0)) {
nb_used = VIRTQUEUE_NUSED(txvq);
virtio_rmb();
need = RTE_MIN(need, (int)nb_used);
virtio_xmit_cleanup(txvq, need);
need = slots - txvq->vq_free_cnt;
if (unlikely(need > 0)) {
PMD_TX_LOG(ERR,
"No free tx descriptors to transmit");
break;
}
}
/* Enqueue Packet buffers */
virtqueue_enqueue_xmit(txvq, txm, slots, use_indirect, can_push);
txvq->bytes += txm->pkt_len;
virtio_update_packet_stats(txvq, txm);
}
txvq->packets += nb_tx;
if (likely(nb_tx)) {
vq_update_avail_idx(txvq);
if (unlikely(virtqueue_kick_prepare(txvq))) {
virtqueue_notify(txvq);
PMD_TX_LOG(DEBUG, "Notified backend after xmit");
}
}
return nb_tx;
}