/**
* Before the last deliver skb to ETH_P_ALL is called, this registered handler will
* be called. During this time, we will revert the pkt_type from control buf in skb
*
* @param[in] skb - double pointer to the skb in case we need to clone..
*
* @returns action that needs to be taken on the skb. we can consume it.
*/
rx_handler_result_t rw_fpath_kni_handle_frame(struct sk_buff **pskb)
{
struct sk_buff *skb = (struct sk_buff *)*pskb;
struct kni_dev *kni;
rx_handler_result_t ret = RX_HANDLER_PASS;
skb = skb_share_check(skb, GFP_ATOMIC);
if (unlikely(!skb))
return RX_HANDLER_CONSUMED;
if (!skb->dev){
KNI_ERR("No device in the skb in rx_handler\n");
return RX_HANDLER_PASS;
}
kni = netdev_priv(skb->dev);
if (!kni){
KNI_ERR("no kni private data in the device in rx_handler\n");
return RX_HANDLER_PASS;
}
*pskb = skb;
switch (skb->pkt_type){
case PACKET_OUTGOING:
skb->pkt_type = PACKET_OTHERHOST;
kni->rx_treat_as_tx_filtered++;
consume_skb(skb);
ret = RX_HANDLER_CONSUMED;
break;
case PACKET_LOOPBACK:
skb->pkt_type = skb->mark;
if (skb->pkt_type == PACKET_OTHERHOST){
/*Force the packet to be accepted by the IP stack*/
skb->pkt_type = 0;
}
kni->rx_treat_as_tx_delivered++;
skb->mark = 0;
break;
case PACKET_OTHERHOST:
kni->rx_filtered++;
consume_skb(skb);
ret = RX_HANDLER_CONSUMED;
break;
default:
kni->rx_delivered++;
break;
}
return ret;
}
/**
* This function is called before delivering the skb to the core network in dev.c
* Dependding on the mbuf flags, we modify the packet-type. The original packet type
* cannot be copied into the control block of the skb since the control block is used
* by different layers. If we need to use the control block then we need to clone the skb
*
* @param[in] mbuf
* @param[in] skb - pointer to the skb
*
* @returns none
*/
static void rw_fpath_kni_set_skb_packet_type(struct rw_kni_mbuf_metadata *mbuf,
struct sk_buff *skb)
{
int pkt_type;
struct kni_dev *kni;
if (!mbuf || !skb)
return;
if (!skb->dev){
KNI_ERR("No device in the skb on receive\n");
return;
}
kni = netdev_priv(skb->dev);
if (!kni){
KNI_ERR("no kni private data in the device on recv\n");
return;
}
skb->vlan_tci = 0;
/*Store the original packet type*/
pkt_type = skb->pkt_type;
if (RW_KNI_VF_VALID_MDATA_ACTION_FLAGS(mbuf)){
if (RW_KNI_VF_GET_MDATA_ACTION_FLAGS(mbuf) & RW_FPATH_PKT_KNI_NEED_FLOW_LOOKUP) {
skb->vlan_tci = 1;
}
if (RW_KNI_VF_GET_MDATA_ACTION_FLAGS(mbuf) & RW_FPATH_PKT_KNI_TREAT_AS_TX){
/*The read lock is taken at this time. Ideally it should be the write lock here
but this is the only place where the counters are increasing*/
kni->rx_treat_as_tx++;
if (RW_KNI_VF_GET_MDATA_ACTION_FLAGS(mbuf) & RW_FPATH_PKT_KNI_DISCARD_ON_RX){
skb->pkt_type = PACKET_OUTGOING;
}else{
skb->pkt_type = PACKET_LOOPBACK;
}
}else{
kni->rx_only++;
if (RW_KNI_VF_GET_MDATA_ACTION_FLAGS(mbuf) & RW_FPATH_PKT_KNI_DISCARD_ON_RX){
skb->pkt_type = PACKET_OTHERHOST;
}
}
}else{
kni->rx_only++;
}
/*Update the packet type in the mark */
skb->mark = pkt_type;
}
/*
* It can be called to process the request.
*/
static int
kni_net_process_request(struct kni_dev *kni, struct rte_kni_request *req)
{
int ret = -1;
void *resp_va;
unsigned num;
int ret_val;
if (!kni || !req) {
KNI_ERR("No kni instance or request\n");
return -EINVAL;
}
mutex_lock(&kni->sync_lock);
/* Construct data */
memcpy(kni->sync_kva, req, sizeof(struct rte_kni_request));
num = kni_fifo_put(kni->req_q, &kni->sync_va, 1);
if (num < 1) {
KNI_ERR("Cannot send to req_q\n");
ret = -EBUSY;
goto fail;
}
ret_val = wait_event_interruptible_timeout(kni->wq,
kni_fifo_count(kni->resp_q), 3 * HZ);
if (signal_pending(current) || ret_val <= 0) {
ret = -ETIME;
goto fail;
}
num = kni_fifo_get(kni->resp_q, (void **)&resp_va, 1);
if (num != 1 || resp_va != kni->sync_va) {
/* This should never happen */
KNI_ERR("No data in resp_q\n");
ret = -ENODATA;
goto fail;
}
memcpy(req, kni->sync_kva, sizeof(struct rte_kni_request));
ret = 0;
fail:
mutex_unlock(&kni->sync_lock);
return ret;
}
/* Free skb and update statistics */
dev_kfree_skb(skb);
kni->stats.tx_dropped++;
return NETDEV_TX_OK;
}
#else /*RTE_LIBRW_PIOT*/
static int
kni_net_tx(struct sk_buff *skb, struct net_device *dev)
{
int len = 0;
unsigned ret;
struct kni_dev *kni = netdev_priv(dev);
struct rte_kni_mbuf *pkt_kva = NULL;
struct rte_kni_mbuf *pkt_va = NULL;
dev->trans_start = jiffies; /* save the timestamp */
/* Check if the length of skb is less than mbuf size */
if (skb->len > kni->mbuf_size){
goto drop;
}
/**
* Check if it has at least one free entry in tx_q and
* one entry in alloc_q.
*/
if (kni_fifo_free_count(kni->tx_q) == 0 ||
kni_fifo_count(kni->alloc_q) == 0) {
/**
* If no free entry in tx_q or no entry in alloc_q,
* drops skb and goes out.
*/
goto drop;
}
/* dequeue a mbuf from alloc_q */
ret = kni_fifo_get(kni->alloc_q, (void **)&pkt_va, 1);
if (likely(ret == 1)) {
void *data_kva;
pkt_kva = (void *)pkt_va - kni->mbuf_va + kni->mbuf_kva;
data_kva = pkt_kva->buf_addr + pkt_kva->data_off - kni->mbuf_va
+ kni->mbuf_kva;
len = skb->len;
memcpy(data_kva, skb->data, len);
if (unlikely(len < ETH_ZLEN)) {
memset(data_kva + len, 0, ETH_ZLEN - len);
len = ETH_ZLEN;
}
pkt_kva->pkt_len = len;
pkt_kva->data_len = len;
/* enqueue mbuf into tx_q */
ret = kni_fifo_put(kni->tx_q, (void **)&pkt_va, 1);
if (unlikely(ret != 1)) {
/* Failing should not happen */
KNI_ERR("Fail to enqueue mbuf into tx_q\n");
goto drop;
}
} else {
/* Failing should not happen */
KNI_ERR("Fail to dequeue mbuf from alloc_q\n");
goto drop;
}
/* Free skb and update statistics */
dev_kfree_skb(skb);
kni->stats.tx_bytes += len;
kni->stats.tx_packets++;
return NETDEV_TX_OK;
drop:
/* Free skb and update statistics */
dev_kfree_skb(skb);
kni->stats.tx_dropped++;
return NETDEV_TX_OK;
}
static int
kni_net_tx(struct sk_buff *skb, struct net_device *dev)
{
int len = 0;
unsigned ret;
struct kni_dev *kni = netdev_priv(dev);
struct rte_kni_mbuf *pkt_kva;
struct rte_kni_mbuf *pkt_va[RW_FPATH_KNI_MAX_SEGS];
int num_req_mbuf = 1;
int err;
kni->tx_attempted++;
err = skb_linearize(skb);
if (unlikely(err)){
goto drop;
}
#ifdef RTE_LIBRW_NOHUGE
if (kni->nohuge){
kni->nl_tx_queued++;
skb_queue_tail(&kni->skb_tx_queue,
skb);
return NETDEV_TX_OK;
}
#endif
dev->trans_start = jiffies; /* save the timestamp */
/* Check if the length of skb is less than mbuf size */
if (skb->len > kni->mbuf_size){
num_req_mbuf = (skb->len/kni->mbuf_size) + 1;
if (num_req_mbuf > RW_FPATH_KNI_MAX_SEGS){
goto drop;
}
}
if (kni->no_tx ||
kni->no_data){
goto drop;
}
if (kni_fifo_free_count(kni->tx_q) < num_req_mbuf){
kni->tx_no_txq++;
/**
* If no free entry in tx_q or no entry in alloc_q,
* drops skb and goes out.
*/
goto drop;
}
if (kni_fifo_count(kni->alloc_q) < num_req_mbuf) {
kni->tx_no_allocq++;
/**
* If no free entry in tx_q or no entry in alloc_q,
* drops skb and goes out.
*/
goto drop;
}
/* dequeue a mbuf from alloc_q */
ret = kni_fifo_get(kni->alloc_q, (void **)&pkt_va[0], num_req_mbuf);
if (likely(ret == num_req_mbuf)) {
int seg_no = 0;
int copylen, remlen;
unsigned char *to, *from;
int next;
struct rte_kni_mbuf **prev;
len = skb->len;
prev = (struct rte_kni_mbuf **)&pkt_va[seg_no]->next;
pkt_kva = (void *)pkt_va[seg_no] - kni->mbuf_va + kni->mbuf_kva;
pkt_kva->pkt_len = len;
RW_KNI_VF_SET_MDATA_PAYLOAD(&pkt_kva->meta_data,
skb->protocol);
from = (unsigned char*)skb->data;
to = (unsigned char*)(pkt_kva->buf_addr + pkt_kva->data_off - kni->mbuf_va
+ kni->mbuf_kva);
remlen = kni->mbuf_size;
next = 0;
while (len > 0) {
copylen = len;
if (copylen > remlen){
next= 1;
copylen = remlen;
}
memcpy(to, from, remlen);
to += copylen;
from += copylen;
len -= copylen;
remlen -= copylen;
if (unlikely(len < ETH_ZLEN)) {
#if 0
//AKKI
memset(data_kva + len, 0, ETH_ZLEN - len);
len = ETH_ZLEN;
#endif
}
pkt_kva->data_len += copylen;
if (next){
seg_no++;
*prev = pkt_va[seg_no];
prev = (struct rte_kni_mbuf **)&pkt_va[seg_no]->next;
pkt_kva = (void *)pkt_va[seg_no] - kni->mbuf_va + kni->mbuf_kva;
to = (unsigned char*)(pkt_kva->buf_addr + pkt_kva->data_off - kni->mbuf_va+ kni->mbuf_kva);
remlen = kni->mbuf_size;
next = 0;
//AKKI increment the nb_segs.. bug bug
}
}
/* enqueue mbuf into tx_q */
ret = kni_fifo_put(kni->tx_q, (void **)&pkt_va[0], 1);
if (unlikely(ret != 1)) {
/* Failing should not happen */
KNI_ERR("Fail to enqueue mbuf into tx_q\n");
goto drop;
}
} else {
/* Failing should not happen */
KNI_ERR("Fail to dequeue mbuf from alloc_q\n");
goto drop;
}
/* Free skb and update statistics */
dev_kfree_skb(skb);
kni->stats.tx_bytes += len;
kni->stats.tx_packets++;
return NETDEV_TX_OK;
drop:
/* Free skb and update statistics */
dev_kfree_skb(skb);
kni->stats.tx_dropped++;
return NETDEV_TX_OK;
}
/*
* RX: loopback with enqueue/dequeue fifos and sk buffer copies.
*/
static void
kni_net_rx_lo_fifo_skb(struct kni_dev *kni)
{
unsigned ret;
uint32_t len;
unsigned i, num_rq, num_fq, num;
struct rte_kni_mbuf *kva;
struct rte_kni_mbuf *va[MBUF_BURST_SZ];
void * data_kva;
struct sk_buff *skb;
struct net_device *dev = kni->net_dev;
/* Get the number of entries in rx_q */
num_rq = kni_fifo_count(kni->rx_q);
/* Get the number of free entries in free_q */
num_fq = kni_fifo_free_count(kni->free_q);
/* Calculate the number of entries to dequeue from rx_q */
num = min(num_rq, num_fq);
num = min(num, (unsigned)MBUF_BURST_SZ);
/* Return if no entry to dequeue from rx_q */
if (num == 0)
return;
/* Burst dequeue mbufs from rx_q */
ret = kni_fifo_get(kni->rx_q, (void **)va, num);
if (ret == 0)
return;
/* Copy mbufs to sk buffer and then call tx interface */
for (i = 0; i < num; i++) {
kva = (void *)va[i] - kni->mbuf_va + kni->mbuf_kva;
len = kva->data_len;
data_kva = kva->buf_addr + kva->data_off - kni->mbuf_va +
kni->mbuf_kva;
skb = dev_alloc_skb(len + 2);
if (skb == NULL)
KNI_ERR("Out of mem, dropping pkts\n");
else {
/* Align IP on 16B boundary */
skb_reserve(skb, 2);
memcpy(skb_put(skb, len), data_kva, len);
skb->dev = dev;
skb->ip_summed = CHECKSUM_UNNECESSARY;
dev_kfree_skb(skb);
}
/* Simulate real usage, allocate/copy skb twice */
skb = dev_alloc_skb(len + 2);
if (skb == NULL) {
KNI_ERR("Out of mem, dropping pkts\n");
kni->stats.rx_dropped++;
}
else {
/* Align IP on 16B boundary */
skb_reserve(skb, 2);
memcpy(skb_put(skb, len), data_kva, len);
skb->dev = dev;
skb->ip_summed = CHECKSUM_UNNECESSARY;
kni->stats.rx_bytes += len;
kni->stats.rx_packets++;
/* call tx interface */
kni_net_tx(skb, dev);
}
}
/* enqueue all the mbufs from rx_q into free_q */
ret = kni_fifo_put(kni->free_q, (void **)&va, num);
if (ret != num)
/* Failing should not happen */
KNI_ERR("Fail to enqueue mbufs into free_q\n");
}
/*
* RX: loopback with enqueue/dequeue fifos.
*/
static void
kni_net_rx_lo_fifo(struct kni_dev *kni)
{
unsigned ret;
uint32_t len;
unsigned i, num, num_rq, num_tq, num_aq, num_fq;
struct rte_kni_mbuf *kva;
struct rte_kni_mbuf *va[MBUF_BURST_SZ];
void * data_kva;
struct rte_kni_mbuf *alloc_kva;
struct rte_kni_mbuf *alloc_va[MBUF_BURST_SZ];
void *alloc_data_kva;
/* Get the number of entries in rx_q */
num_rq = kni_fifo_count(kni->rx_q);
/* Get the number of free entrie in tx_q */
num_tq = kni_fifo_free_count(kni->tx_q);
/* Get the number of entries in alloc_q */
num_aq = kni_fifo_count(kni->alloc_q);
/* Get the number of free entries in free_q */
num_fq = kni_fifo_free_count(kni->free_q);
/* Calculate the number of entries to be dequeued from rx_q */
num = min(num_rq, num_tq);
num = min(num, num_aq);
num = min(num, num_fq);
num = min(num, (unsigned)MBUF_BURST_SZ);
/* Return if no entry to dequeue from rx_q */
if (num == 0)
return;
/* Burst dequeue from rx_q */
ret = kni_fifo_get(kni->rx_q, (void **)va, num);
if (ret == 0)
return; /* Failing should not happen */
/* Dequeue entries from alloc_q */
ret = kni_fifo_get(kni->alloc_q, (void **)alloc_va, num);
if (ret) {
num = ret;
/* Copy mbufs */
for (i = 0; i < num; i++) {
kva = (void *)va[i] - kni->mbuf_va + kni->mbuf_kva;
len = kva->pkt_len;
data_kva = kva->buf_addr + kva->data_off -
kni->mbuf_va + kni->mbuf_kva;
alloc_kva = (void *)alloc_va[i] - kni->mbuf_va +
kni->mbuf_kva;
alloc_data_kva = alloc_kva->buf_addr +
alloc_kva->data_off - kni->mbuf_va +
kni->mbuf_kva;
memcpy(alloc_data_kva, data_kva, len);
alloc_kva->pkt_len = len;
alloc_kva->data_len = len;
kni->stats.tx_bytes += len;
kni->stats.rx_bytes += len;
}
/* Burst enqueue mbufs into tx_q */
ret = kni_fifo_put(kni->tx_q, (void **)alloc_va, num);
if (ret != num)
/* Failing should not happen */
KNI_ERR("Fail to enqueue mbufs into tx_q\n");
}
/* Burst enqueue mbufs into free_q */
ret = kni_fifo_put(kni->free_q, (void **)va, num);
if (ret != num)
/* Failing should not happen */
KNI_ERR("Fail to enqueue mbufs into free_q\n");
/**
* Update statistic, and enqueue/dequeue failure is impossible,
* as all queues are checked at first.
*/
kni->stats.tx_packets += num;
kni->stats.rx_packets += num;
}
/*
* RX: normal working mode
*/
static void
kni_net_rx_normal(struct kni_dev *kni)
{
unsigned ret;
uint32_t len;
unsigned i, num, num_rq, num_fq;
struct rte_kni_mbuf *kva;
struct rte_kni_mbuf *va[MBUF_BURST_SZ];
void * data_kva;
struct sk_buff *skb;
struct net_device *dev = kni->net_dev;
/* Get the number of entries in rx_q */
num_rq = kni_fifo_count(kni->rx_q);
/* Get the number of free entries in free_q */
num_fq = kni_fifo_free_count(kni->free_q);
/* Calculate the number of entries to dequeue in rx_q */
num = min(num_rq, num_fq);
num = min(num, (unsigned)MBUF_BURST_SZ);
/* Return if no entry in rx_q and no free entry in free_q */
if (num == 0)
return;
/* Burst dequeue from rx_q */
ret = kni_fifo_get(kni->rx_q, (void **)va, num);
if (ret == 0)
return; /* Failing should not happen */
/* Transfer received packets to netif */
for (i = 0; i < num; i++) {
kva = (void *)va[i] - kni->mbuf_va + kni->mbuf_kva;
len = kva->data_len;
data_kva = kva->buf_addr + kva->data_off - kni->mbuf_va
+ kni->mbuf_kva;
skb = dev_alloc_skb(len + 2);
if (!skb) {
KNI_ERR("Out of mem, dropping pkts\n");
/* Update statistics */
kni->stats.rx_dropped++;
}
else {
/* Align IP on 16B boundary */
skb_reserve(skb, 2);
memcpy(skb_put(skb, len), data_kva, len);
skb->dev = dev;
skb->protocol = eth_type_trans(skb, dev);
skb->ip_summed = CHECKSUM_UNNECESSARY;
/* Call netif interface */
netif_rx(skb);
/* Update statistics */
kni->stats.rx_bytes += len;
kni->stats.rx_packets++;
}
}
/* Burst enqueue mbufs into free_q */
ret = kni_fifo_put(kni->free_q, (void **)va, num);
if (ret != num)
/* Failing should not happen */
KNI_ERR("Fail to enqueue entries into free_q\n");
}
/*
* RX: normal working mode
*/
static void
kni_net_rx_normal(struct kni_dev *kni)
{
unsigned ret;
uint32_t pkt_len;
uint32_t data_len;
unsigned i, num, num_rq, num_fq;
struct rte_kni_mbuf *kva;
struct rte_kni_mbuf *va[MBUF_BURST_SZ];
void * data_kva;
int copied_len = 0;
int num_segs = 0;
struct sk_buff *skb;
struct net_device *dev = kni->net_dev;
if (kni->no_data){
return;
}
/* Get the number of entries in rx_q */
num_rq = kni_fifo_count(kni->rx_q);
/* Get the number of free entries in free_q */
num_fq = kni_fifo_free_count(kni->free_q);
/* Calculate the number of entries to dequeue in rx_q */
num = min(num_rq, num_fq);
num = min(num, (unsigned)MBUF_BURST_SZ);
/* Return if no entry in rx_q and no free entry in free_q */
if (num == 0)
return;
/* Burst dequeue from rx_q */
ret = kni_fifo_get(kni->rx_q, (void **)va, num);
if (ret == 0)
return; /* Failing should not happen */
/* Transfer received packets to netif */
for (i = 0; i < num; i++) {
kva = (void *)va[i] - kni->mbuf_va + kni->mbuf_kva;
pkt_len = kva->pkt_len;
skb = dev_alloc_skb(pkt_len + 2);
if (!skb) {
KNI_ERR("Out of mem, dropping pkts\n");
/* Update statistics */
kni->stats.rx_dropped++;
continue;
}
/* Align IP on 16B boundary */
skb_reserve(skb, 2);
copied_len = 0;
num_segs = 0;
kva = (void *)va[i];
do {
kva = (void *)kva - kni->mbuf_va + kni->mbuf_kva;
data_kva = kva->buf_addr + kva->data_off - kni->mbuf_va
+ kni->mbuf_kva;
data_len = kva->data_len;
memcpy(skb_put(skb, data_len), data_kva, data_len);
copied_len += data_len;
num_segs++;
}while((kva = (void *)kva->next) != NULL);
/*Go back to the head*/
kva = (void *)va[i] - kni->mbuf_va + kni->mbuf_kva;
kni_net_process_rx_packet(skb, dev, &kva->meta_data);
kni->stats.rx_bytes += pkt_len;
}
/* Burst enqueue mbufs into free_q */
ret = kni_fifo_put(kni->free_q, (void **)va, num);
if (ret != num)
/* Failing should not happen */
KNI_ERR("Fail to enqueue entries into free_q\n");
}
static inline int
kni_vhost_net_tx(struct kni_dev *kni, struct msghdr *m,
unsigned offset, unsigned len)
{
struct rte_kni_mbuf *pkt_kva = NULL;
struct rte_kni_mbuf *pkt_va = NULL;
int ret;
KNI_DBG_TX("tx offset=%d, len=%d, iovlen=%d\n",
#ifdef HAVE_IOV_ITER_MSGHDR
offset, len, (int)m->msg_iter.iov->iov_len);
#else
offset, len, (int)m->msg_iov->iov_len);
#endif
/**
* Check if it has at least one free entry in tx_q and
* one entry in alloc_q.
*/
if (kni_fifo_free_count(kni->tx_q) == 0 ||
kni_fifo_count(kni->alloc_q) == 0) {
/**
* If no free entry in tx_q or no entry in alloc_q,
* drops skb and goes out.
*/
goto drop;
}
/* dequeue a mbuf from alloc_q */
ret = kni_fifo_get(kni->alloc_q, (void **)&pkt_va, 1);
if (likely(ret == 1)) {
void *data_kva;
pkt_kva = (void *)pkt_va - kni->mbuf_va + kni->mbuf_kva;
data_kva = pkt_kva->buf_addr + pkt_kva->data_off
- kni->mbuf_va + kni->mbuf_kva;
#ifdef HAVE_IOV_ITER_MSGHDR
copy_from_iter(data_kva, len, &m->msg_iter);
#else
memcpy_fromiovecend(data_kva, m->msg_iov, offset, len);
#endif
if (unlikely(len < ETH_ZLEN)) {
memset(data_kva + len, 0, ETH_ZLEN - len);
len = ETH_ZLEN;
}
pkt_kva->pkt_len = len;
pkt_kva->data_len = len;
/* enqueue mbuf into tx_q */
ret = kni_fifo_put(kni->tx_q, (void **)&pkt_va, 1);
if (unlikely(ret != 1)) {
/* Failing should not happen */
KNI_ERR("Fail to enqueue mbuf into tx_q\n");
goto drop;
}
} else {
/* Failing should not happen */
KNI_ERR("Fail to dequeue mbuf from alloc_q\n");
goto drop;
}
/* update statistics */
kni->stats.tx_bytes += len;
kni->stats.tx_packets++;
return 0;
drop:
/* update statistics */
kni->stats.tx_dropped++;
return 0;
}
int
kni_chk_vhost_rx(struct kni_dev *kni)
{
struct kni_vhost_queue *q = kni->vhost_queue;
unsigned nb_in, nb_mbuf, nb_skb;
const unsigned BURST_MASK = RX_BURST_SZ - 1;
unsigned nb_burst, nb_backlog, i;
struct sk_buff *skb[RX_BURST_SZ];
struct rte_kni_mbuf *va[RX_BURST_SZ];
if (unlikely(BE_STOP & kni->vq_status)) {
kni->vq_status |= BE_FINISH;
return 0;
}
if (unlikely(q == NULL))
return 0;
nb_skb = kni_fifo_count(q->fifo);
nb_mbuf = kni_fifo_count(kni->rx_q);
nb_in = min(nb_mbuf, nb_skb);
nb_in = min(nb_in, (unsigned)RX_BURST_SZ);
nb_burst = (nb_in & ~BURST_MASK);
nb_backlog = (nb_in & BURST_MASK);
/* enqueue skb_queue per BURST_SIZE bulk */
if (0 != nb_burst) {
if (unlikely(RX_BURST_SZ != kni_fifo_get(
kni->rx_q, (void **)&va,
RX_BURST_SZ)))
goto except;
if (unlikely(RX_BURST_SZ != kni_fifo_get(
q->fifo, (void **)&skb,
RX_BURST_SZ)))
goto except;
kni_vhost_enqueue_burst(kni, q, skb, va);
}
/* all leftover, do one by one */
for (i = 0; i < nb_backlog; ++i) {
if (unlikely(1 != kni_fifo_get(
kni->rx_q,(void **)&va, 1)))
goto except;
if (unlikely(1 != kni_fifo_get(
q->fifo, (void **)&skb, 1)))
goto except;
kni_vhost_enqueue(kni, q, *skb, *va);
}
/* Ondemand wake up */
if ((nb_in == RX_BURST_SZ) || (nb_skb == 0) ||
((nb_mbuf < RX_BURST_SZ) && (nb_mbuf != 0))) {
wake_up_interruptible_poll(sk_sleep(&q->sk),
POLLIN | POLLRDNORM | POLLRDBAND);
KNI_DBG_RX("RX CHK KICK nb_mbuf %d, nb_skb %d, nb_in %d\n",
nb_mbuf, nb_skb, nb_in);
}
return 0;
except:
/* Failing should not happen */
KNI_ERR("Fail to enqueue fifo, it shouldn't happen \n");
BUG_ON(1);
return 0;
}
static inline int
kni_vhost_net_rx(struct kni_dev *kni, struct msghdr *m,
unsigned offset, unsigned len)
{
uint32_t pkt_len;
struct rte_kni_mbuf *kva;
struct rte_kni_mbuf *va;
void * data_kva;
struct sk_buff *skb;
struct kni_vhost_queue *q = kni->vhost_queue;
if (unlikely(q == NULL))
return 0;
/* ensure at least one entry in free_q */
if (unlikely(kni_fifo_free_count(kni->free_q) == 0))
return 0;
skb = skb_dequeue(&q->sk.sk_receive_queue);
if (unlikely(skb == NULL))
return 0;
kva = (struct rte_kni_mbuf*)skb->data;
/* free skb to cache */
skb->data = NULL;
if (unlikely(1 != kni_fifo_put(q->fifo, (void **)&skb, 1)))
/* Failing should not happen */
KNI_ERR("Fail to enqueue entries into rx cache fifo\n");
pkt_len = kva->data_len;
if (unlikely(pkt_len > len))
goto drop;
KNI_DBG_RX("rx offset=%d, len=%d, pkt_len=%d, iovlen=%d\n",
#ifdef HAVE_IOV_ITER_MSGHDR
offset, len, pkt_len, (int)m->msg_iter.iov->iov_len);
#else
offset, len, pkt_len, (int)m->msg_iov->iov_len);
#endif
data_kva = kva->buf_addr + kva->data_off - kni->mbuf_va + kni->mbuf_kva;
#ifdef HAVE_IOV_ITER_MSGHDR
if (unlikely(copy_to_iter(data_kva, pkt_len, &m->msg_iter)))
#else
if (unlikely(memcpy_toiovecend(m->msg_iov, data_kva, offset, pkt_len)))
#endif
goto drop;
/* Update statistics */
kni->stats.rx_bytes += pkt_len;
kni->stats.rx_packets++;
/* enqueue mbufs into free_q */
va = (void*)kva - kni->mbuf_kva + kni->mbuf_va;
if (unlikely(1 != kni_fifo_put(kni->free_q, (void **)&va, 1)))
/* Failing should not happen */
KNI_ERR("Fail to enqueue entries into free_q\n");
KNI_DBG_RX("receive done %d\n", pkt_len);
return pkt_len;
drop:
/* Update drop statistics */
kni->stats.rx_dropped++;
return 0;
}
