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net/virtio: improve offload check performance

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Instead of checking the multiple Virtio features bits for
every packet, let's do the check once at configure time and
store it in virtio_hw struct.

Signed-off-by: Maxime Coquelin <maxime.coquelin@redhat.com>
Reviewed-by: Tiwei Bie <tiwei.bie@intel.com>
This commit is contained in:
Maxime Coquelin 2018-07-02 17:25:47 +02:00 committed by Ferruh Yigit
parent 2f90113251
commit db8d679059
3 changed files with 33 additions and 35 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

19
drivers/net/virtio/virtio_ethdev.c
View File

@ -1798,6 +1798,22 @@ rte_virtio_pmd_init(void)
rte_pci_register(&rte_virtio_pmd);
}
static bool
rx_offload_enabled(struct virtio_hw *hw)
{
return vtpci_with_feature(hw, VIRTIO_NET_F_GUEST_CSUM) ||
vtpci_with_feature(hw, VIRTIO_NET_F_GUEST_TSO4) ||
vtpci_with_feature(hw, VIRTIO_NET_F_GUEST_TSO6);
}
static bool
tx_offload_enabled(struct virtio_hw *hw)
{
return vtpci_with_feature(hw, VIRTIO_NET_F_CSUM) ||
vtpci_with_feature(hw, VIRTIO_NET_F_HOST_TSO4) ||
vtpci_with_feature(hw, VIRTIO_NET_F_HOST_TSO6);
}
/*
* Configure virtio device
* It returns 0 on success.
@ -1877,6 +1893,9 @@ virtio_dev_configure(struct rte_eth_dev *dev)
return -ENOTSUP;
}
hw->has_tx_offload = tx_offload_enabled(hw);
hw->has_rx_offload = rx_offload_enabled(hw);
if (dev->data->dev_flags & RTE_ETH_DEV_INTR_LSC)
/* Enable vector (0) for Link State Intrerrupt */
if (VTPCI_OPS(hw)->set_config_irq(hw, 0) ==

3
drivers/net/virtio/virtio_pci.h
View File

@ -6,6 +6,7 @@
#define _VIRTIO_PCI_H_
#include <stdint.h>
#include <stdbool.h>
#include <rte_pci.h>
#include <rte_bus_pci.h>
@ -240,6 +241,8 @@ struct virtio_hw {
uint8_t use_simple_rx;
uint8_t use_inorder_rx;
uint8_t use_inorder_tx;
bool has_tx_offload;
bool has_rx_offload;
uint16_t port_id;
uint8_t mac_addr[ETHER_ADDR_LEN];
uint32_t notify_off_multiplier;

46
drivers/net/virtio/virtio_rxtx.c
View File

@ -347,13 +347,6 @@ virtio_tso_fix_cksum(struct rte_mbuf *m)
}
}
static inline int
tx_offload_enabled(struct virtio_hw *hw)
{
return vtpci_with_feature(hw, VIRTIO_NET_F_CSUM) ||
vtpci_with_feature(hw, VIRTIO_NET_F_HOST_TSO4) ||
vtpci_with_feature(hw, VIRTIO_NET_F_HOST_TSO6);
}
/* avoid write operation when necessary, to lessen cache issues */
#define ASSIGN_UNLESS_EQUAL(var, val) do { \
@ -364,7 +357,7 @@ tx_offload_enabled(struct virtio_hw *hw)
static inline void
virtqueue_xmit_offload(struct virtio_net_hdr *hdr,
struct rte_mbuf *cookie,
int offload)
bool offload)
{
if (offload) {
if (cookie->ol_flags & PKT_TX_TCP_SEG)
@ -421,14 +414,11 @@ virtqueue_enqueue_xmit_inorder(struct virtnet_tx *txvq,
struct virtio_net_hdr *hdr;
uint16_t idx;
uint16_t head_size = vq->hw->vtnet_hdr_size;
int offload;
uint16_t i = 0;
idx = vq->vq_desc_head_idx;
start_dp = vq->vq_ring.desc;
offload = tx_offload_enabled(vq->hw);
while (i < num) {
idx = idx & (vq->vq_nentries - 1);
dxp = &vq->vq_descx[idx];
@ -440,7 +430,7 @@ virtqueue_enqueue_xmit_inorder(struct virtnet_tx *txvq,
cookies[i]->pkt_len -= head_size;
/* if offload disabled, it is not zeroed below, do it now */
if (offload == 0) {
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);
@ -449,7 +439,8 @@ virtqueue_enqueue_xmit_inorder(struct virtnet_tx *txvq,
ASSIGN_UNLESS_EQUAL(hdr->hdr_len, 0);
}
virtqueue_xmit_offload(hdr, cookies[i], offload);
virtqueue_xmit_offload(hdr, cookies[i],
vq->hw->has_tx_offload);
start_dp[idx].addr = VIRTIO_MBUF_DATA_DMA_ADDR(cookies[i], vq);
start_dp[idx].len = cookies[i]->data_len;
@ -478,9 +469,6 @@ virtqueue_enqueue_xmit(struct virtnet_tx *txvq, struct rte_mbuf *cookie,
uint16_t head_idx, idx;
uint16_t head_size = vq->hw->vtnet_hdr_size;
struct virtio_net_hdr *hdr;
int offload;
offload = tx_offload_enabled(vq->hw);
head_idx = vq->vq_desc_head_idx;
idx = head_idx;
@ -500,7 +488,7 @@ virtqueue_enqueue_xmit(struct virtnet_tx *txvq, struct rte_mbuf *cookie,
cookie->pkt_len -= head_size;
/* if offload disabled, it is not zeroed below, do it now */
if (offload == 0) {
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);
@ -537,7 +525,7 @@ virtqueue_enqueue_xmit(struct virtnet_tx *txvq, struct rte_mbuf *cookie,
idx = start_dp[idx].next;
}
virtqueue_xmit_offload(hdr, cookie, offload);
virtqueue_xmit_offload(hdr, cookie, vq->hw->has_tx_offload);
do {
start_dp[idx].addr = VIRTIO_MBUF_DATA_DMA_ADDR(cookie, vq);
@ -894,14 +882,6 @@ virtio_rx_offload(struct rte_mbuf *m, struct virtio_net_hdr *hdr)
return 0;
}
static inline int
rx_offload_enabled(struct virtio_hw *hw)
{
return vtpci_with_feature(hw, VIRTIO_NET_F_GUEST_CSUM) ||
vtpci_with_feature(hw, VIRTIO_NET_F_GUEST_TSO4) ||
vtpci_with_feature(hw, VIRTIO_NET_F_GUEST_TSO6);
}
#define VIRTIO_MBUF_BURST_SZ 64
#define DESC_PER_CACHELINE (RTE_CACHE_LINE_SIZE / sizeof(struct vring_desc))
uint16_t
@ -917,7 +897,6 @@ virtio_recv_pkts(void *rx_queue, struct rte_mbuf **rx_pkts, uint16_t nb_pkts)
int error;
uint32_t i, nb_enqueued;
uint32_t hdr_size;
int offload;
struct virtio_net_hdr *hdr;
nb_rx = 0;
@ -939,7 +918,6 @@ virtio_recv_pkts(void *rx_queue, struct rte_mbuf **rx_pkts, uint16_t nb_pkts)
nb_enqueued = 0;
hdr_size = hw->vtnet_hdr_size;
offload = rx_offload_enabled(hw);
for (i = 0; i < num ; i++) {
rxm = rcv_pkts[i];
@ -968,7 +946,7 @@ virtio_recv_pkts(void *rx_queue, struct rte_mbuf **rx_pkts, uint16_t nb_pkts)
if (hw->vlan_strip)
rte_vlan_strip(rxm);
if (offload && virtio_rx_offload(rxm, hdr) < 0) {
if (hw->has_rx_offload && virtio_rx_offload(rxm, hdr) < 0) {
virtio_discard_rxbuf(vq, rxm);
rxvq->stats.errors++;
continue;
@ -1030,7 +1008,6 @@ virtio_recv_mergeable_pkts_inorder(void *rx_queue,
uint32_t seg_res;
uint32_t hdr_size;
int32_t i;
int offload;
nb_rx = 0;
if (unlikely(hw->started == 0))
@ -1048,7 +1025,6 @@ virtio_recv_mergeable_pkts_inorder(void *rx_queue,
seg_num = 1;
seg_res = 0;
hdr_size = hw->vtnet_hdr_size;
offload = rx_offload_enabled(hw);
num = virtqueue_dequeue_rx_inorder(vq, rcv_pkts, len, nb_used);
@ -1088,7 +1064,8 @@ virtio_recv_mergeable_pkts_inorder(void *rx_queue,
rx_pkts[nb_rx] = rxm;
prev = rxm;
if (offload && virtio_rx_offload(rxm, &header->hdr) < 0) {
if (vq->hw->has_rx_offload &&
virtio_rx_offload(rxm, &header->hdr) < 0) {
virtio_discard_rxbuf_inorder(vq, rxm);
rxvq->stats.errors++;
continue;
@ -1218,7 +1195,6 @@ virtio_recv_mergeable_pkts(void *rx_queue,
uint16_t extra_idx;
uint32_t seg_res;
uint32_t hdr_size;
int offload;
nb_rx = 0;
if (unlikely(hw->started == 0))
@ -1236,7 +1212,6 @@ virtio_recv_mergeable_pkts(void *rx_queue,
extra_idx = 0;
seg_res = 0;
hdr_size = hw->vtnet_hdr_size;
offload = rx_offload_enabled(hw);
while (i < nb_used) {
struct virtio_net_hdr_mrg_rxbuf *header;
@ -1281,7 +1256,8 @@ virtio_recv_mergeable_pkts(void *rx_queue,
rx_pkts[nb_rx] = rxm;
prev = rxm;
if (offload && virtio_rx_offload(rxm, &header->hdr) < 0) {
if (hw->has_rx_offload &&
virtio_rx_offload(rxm, &header->hdr) < 0) {
virtio_discard_rxbuf(vq, rxm);
rxvq->stats.errors++;
continue;