forked from kevintraynor/dpdk-stable-queue-1811
/
rte_eth_memif.c
1821 lines (1559 loc) · 46.6 KB
/
rte_eth_memif.c
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/* SPDX-License-Identifier: BSD-3-Clause
* Copyright 2018-2019 Cisco Systems, Inc. All rights reserved.
*/
#include <stdlib.h>
#include <fcntl.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <sys/ioctl.h>
#include <sys/mman.h>
#include <linux/if_ether.h>
#include <errno.h>
#include <sys/eventfd.h>
#include <rte_version.h>
#include <rte_mbuf.h>
#include <rte_ether.h>
#include <rte_ethdev_driver.h>
#include <rte_ethdev_vdev.h>
#include <rte_malloc.h>
#include <rte_kvargs.h>
#include <rte_bus_vdev.h>
#include <rte_string_fns.h>
#include <rte_errno.h>
#include <rte_memory.h>
#include <rte_memzone.h>
#include <rte_eal_memconfig.h>
#include "rte_eth_memif.h"
#include "memif_socket.h"
#define ETH_MEMIF_ID_ARG "id"
#define ETH_MEMIF_ROLE_ARG "role"
#define ETH_MEMIF_PKT_BUFFER_SIZE_ARG "bsize"
#define ETH_MEMIF_RING_SIZE_ARG "rsize"
#define ETH_MEMIF_SOCKET_ARG "socket"
#define ETH_MEMIF_MAC_ARG "mac"
#define ETH_MEMIF_ZC_ARG "zero-copy"
#define ETH_MEMIF_SECRET_ARG "secret"
static const char * const valid_arguments[] = {
ETH_MEMIF_ID_ARG,
ETH_MEMIF_ROLE_ARG,
ETH_MEMIF_PKT_BUFFER_SIZE_ARG,
ETH_MEMIF_RING_SIZE_ARG,
ETH_MEMIF_SOCKET_ARG,
ETH_MEMIF_MAC_ARG,
ETH_MEMIF_ZC_ARG,
ETH_MEMIF_SECRET_ARG,
NULL
};
#define MEMIF_MP_SEND_REGION "memif_mp_send_region"
static int memif_region_init_zc(const struct rte_memseg_list *msl,
const struct rte_memseg *ms, void *arg);
const char *
memif_version(void)
{
return ("memif-" RTE_STR(MEMIF_VERSION_MAJOR) "." RTE_STR(MEMIF_VERSION_MINOR));
}
/* Message header to synchronize regions */
struct mp_region_msg {
char port_name[RTE_DEV_NAME_MAX_LEN];
memif_region_index_t idx;
memif_region_size_t size;
};
static int
memif_mp_send_region(const struct rte_mp_msg *msg, const void *peer)
{
struct rte_eth_dev *dev;
struct pmd_process_private *proc_private;
const struct mp_region_msg *msg_param = (const struct mp_region_msg *)msg->param;
struct rte_mp_msg reply;
struct mp_region_msg *reply_param = (struct mp_region_msg *)reply.param;
uint16_t port_id;
int ret;
/* Get requested port */
ret = rte_eth_dev_get_port_by_name(msg_param->port_name, &port_id);
if (ret) {
MIF_LOG(ERR, "Failed to get port id for %s",
msg_param->port_name);
return -1;
}
dev = &rte_eth_devices[port_id];
proc_private = dev->process_private;
memset(&reply, 0, sizeof(reply));
strlcpy(reply.name, msg->name, sizeof(reply.name));
reply_param->idx = msg_param->idx;
if (proc_private->regions[msg_param->idx] != NULL) {
reply_param->size = proc_private->regions[msg_param->idx]->region_size;
reply.fds[0] = proc_private->regions[msg_param->idx]->fd;
reply.num_fds = 1;
}
reply.len_param = sizeof(*reply_param);
if (rte_mp_reply(&reply, peer) < 0) {
MIF_LOG(ERR, "Failed to reply to an add region request");
return -1;
}
return 0;
}
/*
* Request regions
* Called by secondary process, when ports link status goes up.
*/
static int
memif_mp_request_regions(struct rte_eth_dev *dev)
{
int ret, i;
struct timespec timeout = {.tv_sec = 5, .tv_nsec = 0};
struct rte_mp_msg msg, *reply;
struct rte_mp_reply replies;
struct mp_region_msg *msg_param = (struct mp_region_msg *)msg.param;
struct mp_region_msg *reply_param;
struct memif_region *r;
struct pmd_process_private *proc_private = dev->process_private;
struct pmd_internals *pmd = dev->data->dev_private;
/* in case of zero-copy slave, only request region 0 */
uint16_t max_region_num = (pmd->flags & ETH_MEMIF_FLAG_ZERO_COPY) ?
1 : ETH_MEMIF_MAX_REGION_NUM;
MIF_LOG(DEBUG, "Requesting memory regions");
for (i = 0; i < max_region_num; i++) {
/* Prepare the message */
memset(&msg, 0, sizeof(msg));
strlcpy(msg.name, MEMIF_MP_SEND_REGION, sizeof(msg.name));
strlcpy(msg_param->port_name, dev->data->name,
sizeof(msg_param->port_name));
msg_param->idx = i;
msg.len_param = sizeof(*msg_param);
/* Send message */
ret = rte_mp_request_sync(&msg, &replies, &timeout);
if (ret < 0 || replies.nb_received != 1) {
MIF_LOG(ERR, "Failed to send mp msg: %d",
rte_errno);
return -1;
}
reply = &replies.msgs[0];
reply_param = (struct mp_region_msg *)reply->param;
if (reply_param->size > 0) {
r = rte_zmalloc("region", sizeof(struct memif_region), 0);
if (r == NULL) {
MIF_LOG(ERR, "Failed to alloc memif region.");
free(reply);
return -ENOMEM;
}
r->region_size = reply_param->size;
if (reply->num_fds < 1) {
MIF_LOG(ERR, "Missing file descriptor.");
free(reply);
return -1;
}
r->fd = reply->fds[0];
r->addr = NULL;
proc_private->regions[reply_param->idx] = r;
proc_private->regions_num++;
}
free(reply);
}
if (pmd->flags & ETH_MEMIF_FLAG_ZERO_COPY) {
ret = rte_memseg_walk(memif_region_init_zc, (void *)proc_private);
if (ret < 0)
return ret;
}
return memif_connect(dev);
}
static int
memif_dev_info(struct rte_eth_dev *dev __rte_unused, struct rte_eth_dev_info *dev_info)
{
dev_info->max_mac_addrs = 1;
dev_info->max_rx_pktlen = (uint32_t)ETH_FRAME_LEN;
dev_info->max_rx_queues = ETH_MEMIF_MAX_NUM_Q_PAIRS;
dev_info->max_tx_queues = ETH_MEMIF_MAX_NUM_Q_PAIRS;
dev_info->min_rx_bufsize = 0;
return 0;
}
static memif_ring_t *
memif_get_ring(struct pmd_internals *pmd, struct pmd_process_private *proc_private,
memif_ring_type_t type, uint16_t ring_num)
{
/* rings only in region 0 */
void *p = proc_private->regions[0]->addr;
int ring_size = sizeof(memif_ring_t) + sizeof(memif_desc_t) *
(1 << pmd->run.log2_ring_size);
p = (uint8_t *)p + (ring_num + type * pmd->run.num_s2m_rings) * ring_size;
return (memif_ring_t *)p;
}
static memif_region_offset_t
memif_get_ring_offset(struct rte_eth_dev *dev, struct memif_queue *mq,
memif_ring_type_t type, uint16_t num)
{
struct pmd_internals *pmd = dev->data->dev_private;
struct pmd_process_private *proc_private = dev->process_private;
return ((uint8_t *)memif_get_ring(pmd, proc_private, type, num) -
(uint8_t *)proc_private->regions[mq->region]->addr);
}
static memif_ring_t *
memif_get_ring_from_queue(struct pmd_process_private *proc_private,
struct memif_queue *mq)
{
struct memif_region *r;
r = proc_private->regions[mq->region];
if (r == NULL)
return NULL;
return (memif_ring_t *)((uint8_t *)r->addr + mq->ring_offset);
}
static void *
memif_get_buffer(struct pmd_process_private *proc_private, memif_desc_t *d)
{
return ((uint8_t *)proc_private->regions[d->region]->addr + d->offset);
}
/* Free mbufs received by master */
static void
memif_free_stored_mbufs(struct pmd_process_private *proc_private, struct memif_queue *mq)
{
uint16_t mask = (1 << mq->log2_ring_size) - 1;
memif_ring_t *ring = memif_get_ring_from_queue(proc_private, mq);
/* FIXME: improve performance */
while (mq->last_tail != ring->tail) {
RTE_MBUF_PREFETCH_TO_FREE(mq->buffers[(mq->last_tail + 1) & mask]);
/* Decrement refcnt and free mbuf. (current segment) */
rte_mbuf_refcnt_update(mq->buffers[mq->last_tail & mask], -1);
rte_pktmbuf_free_seg(mq->buffers[mq->last_tail & mask]);
mq->last_tail++;
}
}
static int
memif_pktmbuf_chain(struct rte_mbuf *head, struct rte_mbuf *cur_tail,
struct rte_mbuf *tail)
{
/* Check for number-of-segments-overflow */
if (unlikely(head->nb_segs + tail->nb_segs > RTE_MBUF_MAX_NB_SEGS))
return -EOVERFLOW;
/* Chain 'tail' onto the old tail */
cur_tail->next = tail;
/* accumulate number of segments and total length. */
head->nb_segs = (uint16_t)(head->nb_segs + tail->nb_segs);
tail->pkt_len = tail->data_len;
head->pkt_len += tail->pkt_len;
return 0;
}
static uint16_t
eth_memif_rx(void *queue, struct rte_mbuf **bufs, uint16_t nb_pkts)
{
struct memif_queue *mq = queue;
struct pmd_internals *pmd = rte_eth_devices[mq->in_port].data->dev_private;
struct pmd_process_private *proc_private =
rte_eth_devices[mq->in_port].process_private;
memif_ring_t *ring = memif_get_ring_from_queue(proc_private, mq);
uint16_t cur_slot, last_slot, n_slots, ring_size, mask, s0;
uint16_t n_rx_pkts = 0;
uint16_t mbuf_size = rte_pktmbuf_data_room_size(mq->mempool) -
RTE_PKTMBUF_HEADROOM;
uint16_t src_len, src_off, dst_len, dst_off, cp_len;
memif_ring_type_t type = mq->type;
memif_desc_t *d0;
struct rte_mbuf *mbuf, *mbuf_head, *mbuf_tail;
uint64_t b;
ssize_t size __rte_unused;
uint16_t head;
int ret;
struct rte_eth_link link;
if (unlikely((pmd->flags & ETH_MEMIF_FLAG_CONNECTED) == 0))
return 0;
if (unlikely(ring == NULL)) {
/* Secondary process will attempt to request regions. */
ret = rte_eth_link_get(mq->in_port, &link);
if (ret < 0)
MIF_LOG(ERR, "Failed to get port %u link info: %s",
mq->in_port, rte_strerror(-ret));
return 0;
}
/* consume interrupt */
if ((ring->flags & MEMIF_RING_FLAG_MASK_INT) == 0)
size = read(mq->intr_handle.fd, &b, sizeof(b));
ring_size = 1 << mq->log2_ring_size;
mask = ring_size - 1;
if (type == MEMIF_RING_S2M) {
cur_slot = mq->last_head;
last_slot = __atomic_load_n(&ring->head, __ATOMIC_ACQUIRE);
} else {
cur_slot = mq->last_tail;
last_slot = __atomic_load_n(&ring->tail, __ATOMIC_ACQUIRE);
}
if (cur_slot == last_slot)
goto refill;
n_slots = last_slot - cur_slot;
while (n_slots && n_rx_pkts < nb_pkts) {
mbuf_head = rte_pktmbuf_alloc(mq->mempool);
if (unlikely(mbuf_head == NULL))
goto no_free_bufs;
mbuf = mbuf_head;
mbuf->port = mq->in_port;
next_slot:
s0 = cur_slot & mask;
d0 = &ring->desc[s0];
src_len = d0->length;
dst_off = 0;
src_off = 0;
do {
dst_len = mbuf_size - dst_off;
if (dst_len == 0) {
dst_off = 0;
dst_len = mbuf_size;
/* store pointer to tail */
mbuf_tail = mbuf;
mbuf = rte_pktmbuf_alloc(mq->mempool);
if (unlikely(mbuf == NULL))
goto no_free_bufs;
mbuf->port = mq->in_port;
ret = memif_pktmbuf_chain(mbuf_head, mbuf_tail, mbuf);
if (unlikely(ret < 0)) {
MIF_LOG(ERR, "number-of-segments-overflow");
rte_pktmbuf_free(mbuf);
goto no_free_bufs;
}
}
cp_len = RTE_MIN(dst_len, src_len);
rte_pktmbuf_data_len(mbuf) += cp_len;
rte_pktmbuf_pkt_len(mbuf) = rte_pktmbuf_data_len(mbuf);
if (mbuf != mbuf_head)
rte_pktmbuf_pkt_len(mbuf_head) += cp_len;
memcpy(rte_pktmbuf_mtod_offset(mbuf, void *, dst_off),
(uint8_t *)memif_get_buffer(proc_private, d0) + src_off,
cp_len);
src_off += cp_len;
dst_off += cp_len;
src_len -= cp_len;
} while (src_len);
cur_slot++;
n_slots--;
if (d0->flags & MEMIF_DESC_FLAG_NEXT)
goto next_slot;
mq->n_bytes += rte_pktmbuf_pkt_len(mbuf_head);
*bufs++ = mbuf_head;
n_rx_pkts++;
}
no_free_bufs:
if (type == MEMIF_RING_S2M) {
__atomic_store_n(&ring->tail, cur_slot, __ATOMIC_RELEASE);
mq->last_head = cur_slot;
} else {
mq->last_tail = cur_slot;
}
refill:
if (type == MEMIF_RING_M2S) {
/* ring->head is updated by the receiver and this function
* is called in the context of receiver thread. The loads in
* the receiver do not need to synchronize with its own stores.
*/
head = __atomic_load_n(&ring->head, __ATOMIC_RELAXED);
n_slots = ring_size - head + mq->last_tail;
while (n_slots--) {
s0 = head++ & mask;
d0 = &ring->desc[s0];
d0->length = pmd->run.pkt_buffer_size;
}
__atomic_store_n(&ring->head, head, __ATOMIC_RELEASE);
}
mq->n_pkts += n_rx_pkts;
return n_rx_pkts;
}
static uint16_t
eth_memif_rx_zc(void *queue, struct rte_mbuf **bufs, uint16_t nb_pkts)
{
struct memif_queue *mq = queue;
struct pmd_internals *pmd = rte_eth_devices[mq->in_port].data->dev_private;
struct pmd_process_private *proc_private =
rte_eth_devices[mq->in_port].process_private;
memif_ring_t *ring = memif_get_ring_from_queue(proc_private, mq);
uint16_t cur_slot, last_slot, n_slots, ring_size, mask, s0, head;
uint16_t n_rx_pkts = 0;
memif_desc_t *d0;
struct rte_mbuf *mbuf, *mbuf_tail;
struct rte_mbuf *mbuf_head = NULL;
int ret;
struct rte_eth_link link;
if (unlikely((pmd->flags & ETH_MEMIF_FLAG_CONNECTED) == 0))
return 0;
if (unlikely(ring == NULL)) {
/* Secondary process will attempt to request regions. */
rte_eth_link_get(mq->in_port, &link);
return 0;
}
/* consume interrupt */
if ((ring->flags & MEMIF_RING_FLAG_MASK_INT) == 0) {
uint64_t b;
ssize_t size __rte_unused;
size = read(mq->intr_handle.fd, &b, sizeof(b));
}
ring_size = 1 << mq->log2_ring_size;
mask = ring_size - 1;
cur_slot = mq->last_tail;
last_slot = ring->tail;
if (cur_slot == last_slot)
goto refill;
n_slots = last_slot - cur_slot;
while (n_slots && n_rx_pkts < nb_pkts) {
s0 = cur_slot & mask;
d0 = &ring->desc[s0];
mbuf_head = mq->buffers[s0];
mbuf = mbuf_head;
next_slot:
/* prefetch next descriptor */
if (n_rx_pkts + 1 < nb_pkts)
rte_prefetch0(&ring->desc[(cur_slot + 1) & mask]);
mbuf->port = mq->in_port;
rte_pktmbuf_data_len(mbuf) = d0->length;
rte_pktmbuf_pkt_len(mbuf) = rte_pktmbuf_data_len(mbuf);
mq->n_bytes += rte_pktmbuf_data_len(mbuf);
cur_slot++;
n_slots--;
if (d0->flags & MEMIF_DESC_FLAG_NEXT) {
s0 = cur_slot & mask;
d0 = &ring->desc[s0];
mbuf_tail = mbuf;
mbuf = mq->buffers[s0];
ret = memif_pktmbuf_chain(mbuf_head, mbuf_tail, mbuf);
if (unlikely(ret < 0)) {
MIF_LOG(ERR, "number-of-segments-overflow");
goto refill;
}
goto next_slot;
}
*bufs++ = mbuf_head;
n_rx_pkts++;
}
mq->last_tail = cur_slot;
/* Supply master with new buffers */
refill:
head = ring->head;
n_slots = ring_size - head + mq->last_tail;
if (n_slots < 32)
goto no_free_mbufs;
ret = rte_pktmbuf_alloc_bulk(mq->mempool, &mq->buffers[head & mask], n_slots);
if (unlikely(ret < 0))
goto no_free_mbufs;
while (n_slots--) {
s0 = head++ & mask;
if (n_slots > 0)
rte_prefetch0(mq->buffers[head & mask]);
d0 = &ring->desc[s0];
/* store buffer header */
mbuf = mq->buffers[s0];
/* populate descriptor */
d0->length = rte_pktmbuf_data_room_size(mq->mempool) -
RTE_PKTMBUF_HEADROOM;
d0->region = 1;
d0->offset = rte_pktmbuf_mtod(mbuf, uint8_t *) -
(uint8_t *)proc_private->regions[d0->region]->addr;
}
no_free_mbufs:
rte_mb();
ring->head = head;
mq->n_pkts += n_rx_pkts;
return n_rx_pkts;
}
static uint16_t
eth_memif_tx(void *queue, struct rte_mbuf **bufs, uint16_t nb_pkts)
{
struct memif_queue *mq = queue;
struct pmd_internals *pmd = rte_eth_devices[mq->in_port].data->dev_private;
struct pmd_process_private *proc_private =
rte_eth_devices[mq->in_port].process_private;
memif_ring_t *ring = memif_get_ring_from_queue(proc_private, mq);
uint16_t slot, saved_slot, n_free, ring_size, mask, n_tx_pkts = 0;
uint16_t src_len, src_off, dst_len, dst_off, cp_len;
memif_ring_type_t type = mq->type;
memif_desc_t *d0;
struct rte_mbuf *mbuf;
struct rte_mbuf *mbuf_head;
uint64_t a;
ssize_t size;
struct rte_eth_link link;
if (unlikely((pmd->flags & ETH_MEMIF_FLAG_CONNECTED) == 0))
return 0;
if (unlikely(ring == NULL)) {
int ret;
/* Secondary process will attempt to request regions. */
ret = rte_eth_link_get(mq->in_port, &link);
if (ret < 0)
MIF_LOG(ERR, "Failed to get port %u link info: %s",
mq->in_port, rte_strerror(-ret));
return 0;
}
ring_size = 1 << mq->log2_ring_size;
mask = ring_size - 1;
if (type == MEMIF_RING_S2M) {
/* For S2M queues ring->head is updated by the sender and
* this function is called in the context of sending thread.
* The loads in the sender do not need to synchronize with
* its own stores. Hence, the following load can be a
* relaxed load.
*/
slot = __atomic_load_n(&ring->head, __ATOMIC_RELAXED);
n_free = ring_size - slot +
__atomic_load_n(&ring->tail, __ATOMIC_ACQUIRE);
} else {
/* For M2S queues ring->tail is updated by the sender and
* this function is called in the context of sending thread.
* The loads in the sender do not need to synchronize with
* its own stores. Hence, the following load can be a
* relaxed load.
*/
slot = __atomic_load_n(&ring->tail, __ATOMIC_RELAXED);
n_free = __atomic_load_n(&ring->head, __ATOMIC_ACQUIRE) - slot;
}
while (n_tx_pkts < nb_pkts && n_free) {
mbuf_head = *bufs++;
mbuf = mbuf_head;
saved_slot = slot;
d0 = &ring->desc[slot & mask];
dst_off = 0;
dst_len = (type == MEMIF_RING_S2M) ?
pmd->run.pkt_buffer_size : d0->length;
next_in_chain:
src_off = 0;
src_len = rte_pktmbuf_data_len(mbuf);
while (src_len) {
if (dst_len == 0) {
if (n_free) {
slot++;
n_free--;
d0->flags |= MEMIF_DESC_FLAG_NEXT;
d0 = &ring->desc[slot & mask];
dst_off = 0;
dst_len = (type == MEMIF_RING_S2M) ?
pmd->run.pkt_buffer_size : d0->length;
d0->flags = 0;
} else {
slot = saved_slot;
goto no_free_slots;
}
}
cp_len = RTE_MIN(dst_len, src_len);
memcpy((uint8_t *)memif_get_buffer(proc_private, d0) + dst_off,
rte_pktmbuf_mtod_offset(mbuf, void *, src_off),
cp_len);
mq->n_bytes += cp_len;
src_off += cp_len;
dst_off += cp_len;
src_len -= cp_len;
dst_len -= cp_len;
d0->length = dst_off;
}
if (rte_pktmbuf_is_contiguous(mbuf) == 0) {
mbuf = mbuf->next;
goto next_in_chain;
}
n_tx_pkts++;
slot++;
n_free--;
rte_pktmbuf_free(mbuf_head);
}
no_free_slots:
if (type == MEMIF_RING_S2M)
__atomic_store_n(&ring->head, slot, __ATOMIC_RELEASE);
else
__atomic_store_n(&ring->tail, slot, __ATOMIC_RELEASE);
if ((ring->flags & MEMIF_RING_FLAG_MASK_INT) == 0) {
a = 1;
size = write(mq->intr_handle.fd, &a, sizeof(a));
if (unlikely(size < 0)) {
MIF_LOG(WARNING,
"Failed to send interrupt. %s", strerror(errno));
}
}
mq->n_pkts += n_tx_pkts;
return n_tx_pkts;
}
static int
memif_tx_one_zc(struct pmd_process_private *proc_private, struct memif_queue *mq,
memif_ring_t *ring, struct rte_mbuf *mbuf, const uint16_t mask,
uint16_t slot, uint16_t n_free)
{
memif_desc_t *d0;
int used_slots = 1;
next_in_chain:
/* store pointer to mbuf to free it later */
mq->buffers[slot & mask] = mbuf;
/* Increment refcnt to make sure the buffer is not freed before master
* receives it. (current segment)
*/
rte_mbuf_refcnt_update(mbuf, 1);
/* populate descriptor */
d0 = &ring->desc[slot & mask];
d0->length = rte_pktmbuf_data_len(mbuf);
mq->n_bytes += rte_pktmbuf_data_len(mbuf);
/* FIXME: get region index */
d0->region = 1;
d0->offset = rte_pktmbuf_mtod(mbuf, uint8_t *) -
(uint8_t *)proc_private->regions[d0->region]->addr;
d0->flags = 0;
/* check if buffer is chained */
if (rte_pktmbuf_is_contiguous(mbuf) == 0) {
if (n_free < 2)
return 0;
/* mark buffer as chained */
d0->flags |= MEMIF_DESC_FLAG_NEXT;
/* advance mbuf */
mbuf = mbuf->next;
/* update counters */
used_slots++;
slot++;
n_free--;
goto next_in_chain;
}
return used_slots;
}
static uint16_t
eth_memif_tx_zc(void *queue, struct rte_mbuf **bufs, uint16_t nb_pkts)
{
struct memif_queue *mq = queue;
struct pmd_internals *pmd = rte_eth_devices[mq->in_port].data->dev_private;
struct pmd_process_private *proc_private =
rte_eth_devices[mq->in_port].process_private;
memif_ring_t *ring = memif_get_ring_from_queue(proc_private, mq);
uint16_t slot, n_free, ring_size, mask, n_tx_pkts = 0;
memif_ring_type_t type = mq->type;
struct rte_eth_link link;
if (unlikely((pmd->flags & ETH_MEMIF_FLAG_CONNECTED) == 0))
return 0;
if (unlikely(ring == NULL)) {
/* Secondary process will attempt to request regions. */
rte_eth_link_get(mq->in_port, &link);
return 0;
}
ring_size = 1 << mq->log2_ring_size;
mask = ring_size - 1;
/* free mbufs received by master */
memif_free_stored_mbufs(proc_private, mq);
/* ring type always MEMIF_RING_S2M */
slot = ring->head;
n_free = ring_size - ring->head + mq->last_tail;
int used_slots;
while (n_free && (n_tx_pkts < nb_pkts)) {
while ((n_free > 4) && ((nb_pkts - n_tx_pkts) > 4)) {
if ((nb_pkts - n_tx_pkts) > 8) {
rte_prefetch0(*bufs + 4);
rte_prefetch0(*bufs + 5);
rte_prefetch0(*bufs + 6);
rte_prefetch0(*bufs + 7);
}
used_slots = memif_tx_one_zc(proc_private, mq, ring, *bufs++,
mask, slot, n_free);
if (unlikely(used_slots < 1))
goto no_free_slots;
n_tx_pkts++;
slot += used_slots;
n_free -= used_slots;
used_slots = memif_tx_one_zc(proc_private, mq, ring, *bufs++,
mask, slot, n_free);
if (unlikely(used_slots < 1))
goto no_free_slots;
n_tx_pkts++;
slot += used_slots;
n_free -= used_slots;
used_slots = memif_tx_one_zc(proc_private, mq, ring, *bufs++,
mask, slot, n_free);
if (unlikely(used_slots < 1))
goto no_free_slots;
n_tx_pkts++;
slot += used_slots;
n_free -= used_slots;
used_slots = memif_tx_one_zc(proc_private, mq, ring, *bufs++,
mask, slot, n_free);
if (unlikely(used_slots < 1))
goto no_free_slots;
n_tx_pkts++;
slot += used_slots;
n_free -= used_slots;
}
used_slots = memif_tx_one_zc(proc_private, mq, ring, *bufs++,
mask, slot, n_free);
if (unlikely(used_slots < 1))
goto no_free_slots;
n_tx_pkts++;
slot += used_slots;
n_free -= used_slots;
}
no_free_slots:
rte_mb();
/* update ring pointers */
if (type == MEMIF_RING_S2M)
ring->head = slot;
else
ring->tail = slot;
/* Send interrupt, if enabled. */
if ((ring->flags & MEMIF_RING_FLAG_MASK_INT) == 0) {
uint64_t a = 1;
ssize_t size = write(mq->intr_handle.fd, &a, sizeof(a));
if (unlikely(size < 0)) {
MIF_LOG(WARNING,
"Failed to send interrupt. %s", strerror(errno));
}
}
/* increment queue counters */
mq->n_pkts += n_tx_pkts;
return n_tx_pkts;
}
void
memif_free_regions(struct rte_eth_dev *dev)
{
struct pmd_process_private *proc_private = dev->process_private;
struct pmd_internals *pmd = dev->data->dev_private;
int i;
struct memif_region *r;
/* regions are allocated contiguously, so it's
* enough to loop until 'proc_private->regions_num'
*/
for (i = 0; i < proc_private->regions_num; i++) {
r = proc_private->regions[i];
if (r != NULL) {
/* This is memzone */
if (i > 0 && (pmd->flags & ETH_MEMIF_FLAG_ZERO_COPY)) {
r->addr = NULL;
if (r->fd > 0)
close(r->fd);
}
if (r->addr != NULL) {
munmap(r->addr, r->region_size);
if (r->fd > 0) {
close(r->fd);
r->fd = -1;
}
}
rte_free(r);
proc_private->regions[i] = NULL;
}
}
proc_private->regions_num = 0;
}
static int
memif_region_init_zc(const struct rte_memseg_list *msl, const struct rte_memseg *ms,
void *arg)
{
struct pmd_process_private *proc_private = (struct pmd_process_private *)arg;
struct memif_region *r;
if (proc_private->regions_num < 1) {
MIF_LOG(ERR, "Missing descriptor region");
return -1;
}
r = proc_private->regions[proc_private->regions_num - 1];
if (r->addr != msl->base_va)
r = proc_private->regions[++proc_private->regions_num - 1];
if (r == NULL) {
r = rte_zmalloc("region", sizeof(struct memif_region), 0);
if (r == NULL) {
MIF_LOG(ERR, "Failed to alloc memif region.");
return -ENOMEM;
}
r->addr = msl->base_va;
r->region_size = ms->len;
r->fd = rte_memseg_get_fd(ms);
if (r->fd < 0)
return -1;
r->pkt_buffer_offset = 0;
proc_private->regions[proc_private->regions_num - 1] = r;
} else {
r->region_size += ms->len;
}
return 0;
}
static int
memif_region_init_shm(struct rte_eth_dev *dev, uint8_t has_buffers)
{
struct pmd_internals *pmd = dev->data->dev_private;
struct pmd_process_private *proc_private = dev->process_private;
char shm_name[ETH_MEMIF_SHM_NAME_SIZE];
int ret = 0;
struct memif_region *r;
if (proc_private->regions_num >= ETH_MEMIF_MAX_REGION_NUM) {
MIF_LOG(ERR, "Too many regions.");
return -1;
}
r = rte_zmalloc("region", sizeof(struct memif_region), 0);
if (r == NULL) {
MIF_LOG(ERR, "Failed to alloc memif region.");
return -ENOMEM;
}
/* calculate buffer offset */
r->pkt_buffer_offset = (pmd->run.num_s2m_rings + pmd->run.num_m2s_rings) *
(sizeof(memif_ring_t) + sizeof(memif_desc_t) *
(1 << pmd->run.log2_ring_size));
r->region_size = r->pkt_buffer_offset;
/* if region has buffers, add buffers size to region_size */
if (has_buffers == 1)
r->region_size += (uint32_t)(pmd->run.pkt_buffer_size *
(1 << pmd->run.log2_ring_size) *
(pmd->run.num_s2m_rings +
pmd->run.num_m2s_rings));
memset(shm_name, 0, sizeof(char) * ETH_MEMIF_SHM_NAME_SIZE);
snprintf(shm_name, ETH_MEMIF_SHM_NAME_SIZE, "memif_region_%d",
proc_private->regions_num);
r->fd = memfd_create(shm_name, MFD_ALLOW_SEALING);
if (r->fd < 0) {
MIF_LOG(ERR, "Failed to create shm file: %s.", strerror(errno));
ret = -1;
goto error;
}
ret = fcntl(r->fd, F_ADD_SEALS, F_SEAL_SHRINK);
if (ret < 0) {
MIF_LOG(ERR, "Failed to add seals to shm file: %s.", strerror(errno));
goto error;
}
ret = ftruncate(r->fd, r->region_size);
if (ret < 0) {
MIF_LOG(ERR, "Failed to truncate shm file: %s.", strerror(errno));
goto error;
}
r->addr = mmap(NULL, r->region_size, PROT_READ |
PROT_WRITE, MAP_SHARED, r->fd, 0);
if (r->addr == MAP_FAILED) {
MIF_LOG(ERR, "Failed to mmap shm region: %s.", strerror(ret));
ret = -1;
goto error;
}
proc_private->regions[proc_private->regions_num] = r;
proc_private->regions_num++;
return ret;
error:
if (r->fd > 0)
close(r->fd);
r->fd = -1;
return ret;
}
static int
memif_regions_init(struct rte_eth_dev *dev)
{
struct pmd_internals *pmd = dev->data->dev_private;
int ret;
/*
* Zero-copy exposes dpdk memory.
* Each memseg list will be represented by memif region.
* Zero-copy regions indexing: memseg list idx + 1,
* as we already have region 0 reserved for descriptors.
*/
if (pmd->flags & ETH_MEMIF_FLAG_ZERO_COPY) {
/* create region idx 0 containing descriptors */
ret = memif_region_init_shm(dev, 0);
if (ret < 0)
return ret;
ret = rte_memseg_walk(memif_region_init_zc, (void *)dev->process_private);
if (ret < 0)
return ret;
} else {
/* create one memory region contaning rings and buffers */
ret = memif_region_init_shm(dev, /* has buffers */ 1);
if (ret < 0)
return ret;
}
return 0;
}
static void
memif_init_rings(struct rte_eth_dev *dev)
{
struct pmd_internals *pmd = dev->data->dev_private;
struct pmd_process_private *proc_private = dev->process_private;
memif_ring_t *ring;
int i, j;
uint16_t slot;