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uknetdev.c
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uknetdev.c
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/* SPDX-License-Identifier: BSD-3-Clause */
/*
* Authors: Simon Kuenzer <simon.kuenzer@neclab.eu>
*
* Copyright (c) 2019, NEC Laboratories Europe GmbH, NEC Corporation.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. 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.
* 3. Neither the name of the copyright holder 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 HOLDER 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 <uk/config.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <uk/alloc.h>
#include <uk/print.h>
#include "netif/uknetdev.h"
#include "netbuf.h"
#include "lwip/opt.h"
#include "lwip/def.h"
#include "lwip/pbuf.h"
#include "lwip/stats.h"
#include "lwip/snmp.h"
#include "lwip/sys.h"
#include "lwip/tcpip.h"
#include "lwip/ethip6.h"
#include "netif/etharp.h"
#include "netif/ethernet.h"
#include <uk/atomic.h>
#include <uk/essentials.h>
/*
* NOTE: We do not support ETH_PAD_SIZE with uknetdev.
* According to https://lwn.net/Articles/89597/, the gain of doing padding
* seems to be negligible on the CPU architectures that we currently
* support and may hurt DMA engine performances that may get involved with
* the driver and/or hypervisor. Additionally, it will cause difficulties
* with the current netfront driver because the protocol does not support
* setting an offset for page-aligned receive buffers. Aligning the frame
* could then only be achieved by moving the packet bytes in memory which
* is obviously ways too costly. Because of this, we disable this feature
* completely.
*/
#if ETH_PAD_SIZE
#error ETH_PAD_SIZE is not '0'. This is not supported.
#endif
#define UKNETDEV_BPS 1000000000u
#define UKNETDEV_BUFLEN 2048
#define UKNETDEV_NETIF_NAME0 'e'
#define UKNETDEV_NETIF_NAME1 'n'
struct lwip_netdev_data {
/*
* NOTE: For now we use the same allocator for RX and TX packets.
* However, the uknetdev API enables us to use individual ones
* per queue. The idea could be to avoid competition on
* allocations which are potentially expensive. In such a case,
* this lwip setup can be reconsidered.
*/
struct uk_alloc *pkt_a;
struct uk_netdev_info dev_info;
#ifdef CONFIG_HAVE_SCHED
struct uk_thread *poll_thread; /* Thread per device */
char *_name; /* Thread name */
struct uk_sched *sched; /* Scheduler information */
#endif /* CONFIG_HAVE_SCHED */
};
/*
* Compile-time assertion that ensures that the uknetdev scratch pad can fit
* `struct lwip_netdev_data`. In case this is not fulfilled, please adopt
* LWIP_UKNETDEV_SCRATCH in `Config.uk`. The purpose of using the
* scratch pad is performance: `struct lwip_netdev_data` is on the same
* allocation as `struct uknetdev`. Cache-locality can be utilized better.
*/
UK_CTASSERT((sizeof(struct lwip_netdev_data)) <= CONFIG_UK_NETDEV_SCRATCH_SIZE);
#define netif_to_uknetdev(nf) \
((struct uk_netdev *) (nf)->state)
static uint16_t netif_alloc_rxpkts(void *argp, struct uk_netbuf *nb[],
uint16_t count)
{
struct lwip_netdev_data *lwip_data;
uint16_t i;
UK_ASSERT(argp);
lwip_data = (struct lwip_netdev_data *) argp;
for (i = 0; i < count; ++i) {
nb[i] = lwip_alloc_netbuf(lwip_data->pkt_a,
UKNETDEV_BUFLEN,
lwip_data->dev_info.ioalign,
lwip_data->dev_info.nb_encap_rx);
if (!nb[i]) {
/* we run out of memory */
break;
}
}
return i;
}
static err_t uknetdev_output(struct netif *nf, struct pbuf *p)
{
struct uk_netdev *dev;
struct lwip_netdev_data *lwip_data;
struct pbuf *q;
struct uk_netbuf *nb;
char *wpos;
int ret;
UK_ASSERT(nf);
dev = netif_to_uknetdev(nf);
UK_ASSERT(dev);
lwip_data = (struct lwip_netdev_data *) dev->scratch_pad;
UK_ASSERT(lwip_data);
nb = uk_netbuf_alloc_buf(lwip_data->pkt_a,
UKNETDEV_BUFLEN,
lwip_data->dev_info.ioalign,
lwip_data->dev_info.nb_encap_tx,
0, NULL);
if (!nb)
return ERR_MEM;
if (unlikely(p->tot_len > uk_netbuf_tailroom(nb))) {
LWIP_DEBUGF(NETIF_DEBUG,
("%s: %c%c%u: Cannot send %"PRIu16" bytes, too big (> %"__PRIsz")\n",
__func__, nf->name[0], nf->name[1], nf->num,
p->tot_len, uk_netbuf_tailroom(nb)));
uk_netbuf_free_single(nb);
return ERR_MEM;
}
/*
* Copy pbuf to netbuf
* NOTE: Unfortunately, lwIP seems not to support zero-copy transmit,
* yet. As long as we do not have this, we have to copy.
*/
wpos = nb->data;
for (q = p; q != NULL; q = q->next) {
memcpy(wpos, q->payload, q->len);
wpos += q->len;
}
nb->len = p->tot_len;
/* Transmit packet */
do {
ret = uk_netdev_tx_one(dev, 0, nb);
} while (uk_netdev_status_notready(ret));
if (unlikely(ret < 0)) {
LWIP_DEBUGF(NETIF_DEBUG,
("%s: %c%c%u: Failed to send %"PRIu16" bytes\n",
__func__, nf->name[0], nf->name[1], nf->num,
p->tot_len));
/*
* Decrease refcount again because in
* the error case the netdev did not consume the pbuf
*/
uk_netbuf_free_single(nb);
return ERR_IF;
}
LWIP_DEBUGF(NETIF_DEBUG, ("%s: %c%c%u: Sent %"PRIu16" bytes\n",
__func__, nf->name[0], nf->name[1], nf->num,
p->tot_len));
return ERR_OK;
}
static void uknetdev_input(struct uk_netdev *dev,
uint16_t queue_id __unused, void *argp)
{
struct netif *nf = (struct netif *) argp;
struct uk_netbuf *nb;
struct pbuf *p;
err_t err;
int ret;
UK_ASSERT(dev);
UK_ASSERT(nf);
UK_ASSERT(nf->input);
LWIP_DEBUGF(NETIF_DEBUG, ("%s: %c%c%u: Poll receive queue...\n",
__func__, nf->name[0], nf->name[1], nf->num));
do {
ret = uk_netdev_rx_one(dev, 0, &nb);
LWIP_DEBUGF(NETIF_DEBUG,
("%s: %c%c%u: Input status %d (%c%c%c)\n",
__func__, nf->name[0], nf->name[1], nf->num, ret,
uk_netdev_status_test_set(ret,
UK_NETDEV_STATUS_SUCCESS)
? 'S' : '-',
uk_netdev_status_test_set(ret,
UK_NETDEV_STATUS_MORE)
? 'M' : '-',
uk_netdev_status_test_set(ret,
UK_NETDEV_STATUS_UNDERRUN)
? 'U' : '-'));
if (unlikely(ret < 0)) {
/*
* Ouch, an error happened. We cannot recover from it
* currently, so we will throw an error message, bring
* the interface down, and leave our loop.
*/
uk_pr_crit("%c%c%u: Receive error %d. Stopping interface...\n",
nf->name[0], nf->name[1], nf->num, ret);
netif_set_down(nf);
break;
}
if (uk_netdev_status_notready(ret)) {
/* No (more) packets received */
break;
}
LWIP_DEBUGF(NETIF_DEBUG,
("%s: %c%c%u: Received %"PRIu16" bytes\n",
__func__, nf->name[0], nf->name[1], nf->num,
nb->len));
/* Send packet to lwip */
p = lwip_netbuf_to_pbuf(nb);
p->payload = nb->data;
p->tot_len = p->len = nb->len;
err = nf->input(p, nf);
if (unlikely(err != ERR_OK)) {
#if CONFIG_LWIP_THREADS && CONFIG_LIBUKNETDEV_DISPATCHERTHREADS
/* At this point it is possible that lwIP's input queue
* is full or we run out of memory. In this case, we
* return to the scheduler and hope that lwIP's main
* thread is able to process some packets.
* Afterwards, we try it once again.
*/
if (err == ERR_MEM) {
LWIP_DEBUGF(NETIF_DEBUG,
("%s: %c%c%u: lwIP's input queue full: yielding and trying once again...\n",
__func__, nf->name[0], nf->name[1],
nf->num));
uk_sched_yield();
err = nf->input(p, nf);
if (likely(err == ERR_OK))
continue;
}
#endif
/*
* Drop the packet that we could not send to the stack
*/
uk_pr_err("%c%c%u: Failed to forward packet to lwIP: %d\n",
nf->name[0], nf->name[1], nf->num, err);
uk_netbuf_free_single(nb);
}
} while (uk_netdev_status_more(ret));
}
/*
* TODO: We are not exporting any error states to the user. This is inline
* with what lwip provides for loopback and slipif interfaces. However, this
* does not give the user any chance to react on an receive errors in their
* mainloop. Maybe we should revisit this interface when we add support for
* netif removal in order to let API users re-initialize interfaces.
*/
void uknetdev_poll(struct netif *nf)
{
struct uk_netdev *dev;
UK_ASSERT(nf);
/*
* TODO: Unfortunately, checking the interface name is a weak sanity
* check that uknetdev_poll() is called on a netif that is driven by
* this driver...
*/
UK_ASSERT(nf->name[0] == UKNETDEV_NETIF_NAME0);
UK_ASSERT(nf->name[1] == UKNETDEV_NETIF_NAME1);
dev = netif_to_uknetdev(nf);
UK_ASSERT(dev);
uknetdev_input(dev, 0, nf);
}
#ifdef CONFIG_LWIP_NOTHREADS
void uknetdev_poll_all(void)
{
struct netif *nf;
/*
* TODO: We are going through all netifs and check the interface name.
* This way we are figuring out that the netif is provided by our
* driver. Probably we should find a better and more stable solution at
* some point...
*/
NETIF_FOREACH(nf) {
if (nf->name[0] == UKNETDEV_NETIF_NAME0
&& nf->name[1] == UKNETDEV_NETIF_NAME1)
uknetdev_poll(nf);
}
}
#else /* CONFIG_LWIP_NOTHREADS */
static __noreturn void _poll_netif(void *arg)
{
struct netif *nf = (struct netif *) arg;
while (1) {
uknetdev_poll(nf);
uk_sched_yield();
}
}
static void uknetdev_updown(struct netif *nf)
{
struct uk_netdev *dev;
int ret;
struct lwip_netdev_data *lwip_data;
UK_ASSERT(nf);
dev = netif_to_uknetdev(nf);
UK_ASSERT(dev);
lwip_data = (struct lwip_netdev_data *)dev->scratch_pad;
/* Enable and disable interrupts according to netif's up/down status */
if (nf->flags & NETIF_FLAG_UP) {
if (uk_netdev_rxintr_supported(lwip_data->dev_info.features)) {
ret = uk_netdev_rxq_intr_enable(dev, 0);
if (ret < 0) {
LWIP_DEBUGF(NETIF_DEBUG,
("%s: %c%c%u: Failed to enable rx interrupt mode on netdev %u\n",
__func__, nf->name[0],
nf->name[1],
nf->num,
uk_netdev_id_get(dev)));
} else {
LWIP_DEBUGF(NETIF_DEBUG,
("%s: %c%c%u: Enabled rx interrupt mode on netdev %u\n",
__func__, nf->name[0],
nf->name[1],
nf->num,
uk_netdev_id_get(dev)));
}
if (ret == 1) {
/*
* uk_netdev_rxq_intr_enable() told us that we
* need to flush the receive queue before
* interrupts are enabled. For this purpose
* we do an initial poll.
*/
uknetdev_poll(nf);
}
} else {
#ifdef CONFIG_HAVE_SCHED
LWIP_DEBUGF(NETIF_DEBUG,
("%s: Poll receive enabled\n",
__func__));
/* Create a thread */
lwip_data->sched = uk_sched_current();
UK_ASSERT(lwip_data->sched);
lwip_data->poll_thread =
uk_sched_thread_create(lwip_data->sched,
_poll_netif, nf, NULL);
#else /* CONFIG_HAVE_SCHED */
uk_pr_warn("The netdevice does not support interrupt. Ensure the netdevice is polled to receive packets");
#endif /* CONFIG_HAVE_SCHED */
}
} else {
/**
* TODO:
* Cleanup the thread on stopping the network interface.
*/
if (uk_netdev_rxintr_supported(lwip_data->dev_info.features)) {
uk_netdev_rxq_intr_disable(dev, 0);
LWIP_DEBUGF(NETIF_DEBUG,
("%s: %c%c%u: Disabled rx interrupts on netdev %u\n",
__func__, nf->name[0], nf->name[1],
nf->num, uk_netdev_id_get(dev)));
}
}
}
#endif /* CONFIG_LWIP_NOTHREADS */
#if CONFIG_UK_NETDEV_SCRATCH_SIZE < CONFIG_LWIP_UKNETDEV_SCRATCH
/**
* CONFIG_UK_NETDEV_SCRATCH_SIZE is configured as the max of all scratch pad
* requirements by the Makefile.uk macro uknetdev_scratch_mem. This value
* should atleast be greater CONFIG_LWIP_UKNETDEV_SCRATCH
*/
#error "Insufficient Scratch memory"
#endif
/**
* Make sure the CONFIG_LWIP_UKNETDEV_SCRATCH is still sufficient to
* store lwip_data.
*/
UK_CTASSERT(sizeof(struct lwip_netdev_data) <= CONFIG_LWIP_UKNETDEV_SCRATCH);
err_t uknetdev_init(struct netif *nf)
{
struct uk_alloc *a = NULL;
struct uk_netdev *dev;
struct uk_netdev_conf dev_conf;
struct uk_netdev_rxqueue_conf rxq_conf;
struct uk_netdev_txqueue_conf txq_conf = {0};
struct lwip_netdev_data *lwip_data;
const struct uk_hwaddr *hwaddr;
unsigned int i;
int ret;
UK_ASSERT(nf);
dev = netif_to_uknetdev(nf);
UK_ASSERT(dev);
lwip_data = (struct lwip_netdev_data *)dev->scratch_pad;
LWIP_ASSERT("uknetdev needs an input callback (netif_input or tcpip_input)",
nf->input != NULL);
/* Netdev has to be in unconfigured state */
if (uk_netdev_state_get(dev) != UK_NETDEV_UNCONFIGURED) {
LWIP_DEBUGF(NETIF_DEBUG,
("%s: Netdev %u not in uncofigured state\n",
__func__, uk_netdev_id_get(dev)));
return ERR_ISCONN;
}
/* Interface name, the interface number (nf->num) is assigned by lwip */
nf->name[0] = UKNETDEV_NETIF_NAME0;
nf->name[1] = UKNETDEV_NETIF_NAME1;
/*
* Bring up uknetdev
* Note: We use the default allocator for setting up the rx/tx queues
*/
/* TODO: In case the device initialization should happen manually before
* attaching to lwip, we require another init function that skips
* this initialization steps.
*/
a = uk_alloc_get_default();
if (!a)
return ERR_MEM;
/* Get device information */
uk_netdev_info_get(dev, &lwip_data->dev_info);
if (!lwip_data->dev_info.max_rx_queues
|| !lwip_data->dev_info.max_tx_queues)
return ERR_IF;
#if CONFIG_LWIP_UKNETDEV_POLLONLY
/* Unset receive interrupt support: We force polling mode */
lwip_data->dev_info.features &= ~UK_NETDEV_F_RXQ_INTR;
#endif /* CONFIG_LWIP_UKNETDEV_POLLONLY */
lwip_data->pkt_a = a;
LWIP_DEBUGF(NETIF_DEBUG,
("%s: %c%c%u: Headroom rx:%"PRIu16", tx:%"PRIu16"; I/O align: 0x%"PRIx16"\n",
__func__, nf->name[0], nf->name[1], nf->num,
lwip_data->dev_info.nb_encap_rx,
lwip_data->dev_info.nb_encap_tx,
lwip_data->dev_info.ioalign));
/*
* Device configuration,
* we want to use just one queue for each direction
*/
dev_conf.nb_rx_queues = 1;
dev_conf.nb_tx_queues = 1;
ret = uk_netdev_configure(dev, &dev_conf);
if (ret < 0) {
LWIP_DEBUGF(NETIF_DEBUG,
("%s: %c%c%u: Failed to configure netdev %u\n",
__func__, nf->name[0], nf->name[1], nf->num,
uk_netdev_id_get(dev)));
return ERR_IF;
}
/*
* Receive queue,
* use driver default descriptors
*/
rxq_conf.a = a;
rxq_conf.alloc_rxpkts = netif_alloc_rxpkts;
rxq_conf.alloc_rxpkts_argp = lwip_data;
#ifdef CONFIG_LWIP_NOTHREADS
/*
* In mainloop mode, we will not use interrupts.
*/
rxq_conf.callback = NULL;
rxq_conf.callback_cookie = NULL;
#else /* CONFIG_LWIP_NOTHREADS */
rxq_conf.callback = uknetdev_input;
rxq_conf.callback_cookie = nf;
#ifdef CONFIG_LIBUKNETDEV_DISPATCHERTHREADS
rxq_conf.s = uk_sched_current();
if (!rxq_conf.s)
return ERR_IF;
#endif /* CONFIG_LIBUKNETDEV_DISPATCHERTHREADS */
#endif /* CONFIG_LWIP_NOTHREADS */
ret = uk_netdev_rxq_configure(dev, 0, 0, &rxq_conf);
if (ret < 0) {
LWIP_DEBUGF(NETIF_DEBUG,
("%s: %c%c%u: Failed to configure rx queue of netdev %u\n",
__func__, nf->name[0], nf->name[1], nf->num,
uk_netdev_id_get(dev)));
return ERR_IF;
}
/*
* Transmit queue,
* use driver default descriptors
*/
txq_conf.a = a;
ret = uk_netdev_txq_configure(dev, 0, 0, &txq_conf);
if (ret < 0) {
LWIP_DEBUGF(NETIF_DEBUG,
("%s: %c%c%u: Failed to configure tx queue of netdev %u\n",
__func__, nf->name[0], nf->name[1], nf->num,
uk_netdev_id_get(dev)));
return ERR_IF;
}
/* Start interface */
ret = uk_netdev_start(dev);
if (ret < 0) {
LWIP_DEBUGF(NETIF_DEBUG,
("%s: %c%c%u: Failed to start netdev %u\n",
__func__, nf->name[0], nf->name[1], nf->num,
uk_netdev_id_get(dev)));
return ERR_IF;
}
/* Driver callbacks */
#if LWIP_IPV4
nf->output = etharp_output;
#endif /* LWIP_IPV4 */
#if LWIP_IPV6
nf->output_ip6 = ethip6_output;
#endif /* LWIP_IPV6 */
nf->linkoutput = uknetdev_output;
/* TODO: Set remove callback */
/* Device capabilities */
netif_set_flags(nf, (NETIF_FLAG_BROADCAST
| NETIF_FLAG_ETHARP
| NETIF_FLAG_LINK_UP));
LWIP_DEBUGF(NETIF_DEBUG,
("%s: %c%c%u: flags: %"PRIx8"\n",
__func__, nf->name[0], nf->name[1], nf->num, nf->flags));
#if LWIP_CHECKSUM_CTRL_PER_NETIF
/*
* Checksum settings
* TODO: libuknetdev does not support checksum capabilities yet.
* Because of this, we need to calculate the checksum for every
* outgoing packet in software. We assume that we receive packets
* from a virtual interface, so the host was doing a check for us
* already. In case of guest-to-guest communication, the checksum
* field may be incorrect because the other guest expects that the
* host is offloading the calculation to hardware as soon as a
* packet leaves the physical host machine. At this point, the
* best we can do is not to check any checksums on incoming
* traffic and assume everything is fine.
*/
NETIF_SET_CHECKSUM_CTRL(nf, (NETIF_CHECKSUM_GEN_IP
| NETIF_CHECKSUM_GEN_UDP
| NETIF_CHECKSUM_GEN_TCP
| NETIF_CHECKSUM_GEN_ICMP
| NETIF_CHECKSUM_GEN_ICMP6));
LWIP_DEBUGF(NETIF_DEBUG,
("%s: %c%c%u: chksum_flags: %"PRIx16"\n",
__func__, nf->name[0], nf->name[1], nf->num,
nf->chksum_flags));
#endif /* LWIP_CHECKSUM_CTRL_PER_NETIF */
/* MAC address */
UK_ASSERT(NETIF_MAX_HWADDR_LEN >= UK_NETDEV_HWADDR_LEN);
hwaddr = uk_netdev_hwaddr_get(dev);
UK_ASSERT(hwaddr);
nf->hwaddr_len = UK_NETDEV_HWADDR_LEN;
for (i = 0; i < UK_NETDEV_HWADDR_LEN; ++i)
nf->hwaddr[i] = hwaddr->addr_bytes[i];
#if UK_NETDEV_HWADDR_LEN == 6
LWIP_DEBUGF(NETIF_DEBUG,
("%s: %c%c%u: Hardware address: %02"PRIx8":%02"PRIx8":%02"PRIx8":%02"PRIx8":%02"PRIx8":%02"PRIx8"\n",
__func__, nf->name[0], nf->name[1], nf->num,
nf->hwaddr[0], nf->hwaddr[1], nf->hwaddr[2],
nf->hwaddr[3], nf->hwaddr[4], nf->hwaddr[5]));
#else /* UK_NETDEV_HWADDR_LEN */
LWIP_DEBUGF(NETIF_DEBUG,
("%s: %c%c%u: Hardware address set\n",
__func__, nf->name[0], nf->name[1], nf->num));
#endif /* UK_NETDEV_HWADDR_LEN */
/* Maximum transfer unit */
nf->mtu = uk_netdev_mtu_get(dev);
UK_ASSERT(nf->mtu);
LWIP_DEBUGF(NETIF_DEBUG,
("%s: %c%c%u: MTU: %u\n",
__func__, nf->name[0], nf->name[1], nf->num,
nf->mtu));
#ifndef CONFIG_LWIP_NOTHREADS
/*
* We will use the status update callback to enable and disabled
* receive queue interrupts
*/
netif_set_status_callback(nf, uknetdev_updown);
#endif /* !CONFIG_LWIP_NOTHREADS */
/*
* Initialize the snmp variables and counters inside the struct netif.
* The last argument is the link speed, in units of bits per second.
*/
NETIF_INIT_SNMP(nf, snmp_ifType_ethernet_csmacd, UKNETDEV_BPS);
LWIP_DEBUGF(NETIF_DEBUG,
("%s: %c%c%u: Link speed: %"PRIu32" bps\n",
__func__, nf->name[0], nf->name[1], nf->num,
UKNETDEV_BPS));
return ERR_OK;
}
#if CONFIG_LWIP_NOTHREADS
#define NETIF_INPUT ethernet_input
#else /* CONFIG_LWIP_NOTHREADS */
#define NETIF_INPUT tcpip_input
#endif /*CONFIG_LWIP_NOTHREADS */
struct netif *uknetdev_addif(struct uk_netdev *n
#if LWIP_IPV4
,
const ip4_addr_t *ipaddr,
const ip4_addr_t *netmask,
const ip4_addr_t *gw,
#endif /* LWIP_IPV4 */
const char *hostname
)
{
/*
* This pointer and UK_READ_ONCE on it is an ugly workaround
* against a pretty weird problem. Without it, the last
* parameter of netif_add passed as NULL. It seems to be a
* build time problem because:
*
* - Moving "input" parameter to the first positions helps
* - Removing one parameter helps. Seems does not matter which
* - An extra parameter added after "input" works well. And
* input is still NULL in this case
* - Swapping "init" and "input" helps
*/
static const void *pethernet_input = NETIF_INPUT;
struct netif *nf;
struct netif *ret;
nf = mem_calloc(1, sizeof(*nf));
if (!nf)
return NULL;
ret = netif_add(nf,
#if LWIP_IPV4
ipaddr, netmask, gw,
#endif /* LWIP_IPV4 */
n, uknetdev_init, UK_READ_ONCE(pethernet_input));
UK_ASSERT(nf->input);
if (!ret) {
mem_free(nf);
return NULL;
}
if (hostname) {
netif_set_hostname(nf, hostname);
#if CONFIG_LIBPOSIX_SYSINFO
sethostname(hostname, strlen(hostname));
#endif /* CONFIG_LIBPOSIX_SYSINFO */
}
return ret;
}