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net/tap: add MTU management

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The MTU is assigned to the tap netdevice according to the argument, but
packet transmission and reception just write/read on an fd with the
default limit being the socket buffer size.

As a new rte_eth_dev_data is allocated during tap device init, ensure it
is set again dev->data->mtu.
Once the actual netdevice is created via tun_alloc(), make sure to apply
the desired MTU to the netdevice.

Signed-off-by: Pascal Mazon <pascal.mazon@6wind.com>
Reviewed-by: Ferruh Yigit <ferruh.yigit@intel.com>
This commit is contained in:
Pascal Mazon 2017-03-15 15:48:15 +01:00 committed by Ferruh Yigit
parent f76d46b4ff
commit e5dc143a42
2 changed files with 27 additions and 0 deletions
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1
doc/guides/nics/features/tap.ini
View File

@ -9,6 +9,7 @@ Jumbo frame = Y
Promiscuous mode = Y
Allmulticast mode = Y
Basic stats = Y
MTU update = Y
Unicast MAC filter = Y
Other kdrv = Y
ARMv7 = Y

26
drivers/net/tap/rte_eth_tap.c
View File

@ -350,6 +350,7 @@ tap_ioctl(struct pmd_internals *pmd, unsigned long request,
break;
case SIOCGIFHWADDR:
case SIOCSIFHWADDR:
case SIOCSIFMTU:
break;
default:
RTE_LOG(WARNING, PMD, "%s: ioctl() called with wrong arg\n",
@ -595,6 +596,15 @@ tap_setup_queue(struct rte_eth_dev *dev,
pmd->name, qid);
return -1;
}
if (qid == 0) {
struct ifreq ifr;
ifr.ifr_mtu = dev->data->mtu;
if (tap_ioctl(pmd, SIOCSIFMTU, &ifr, 1) < 0) {
close(fd);
return -1;
}
}
}
}
@ -691,6 +701,20 @@ tap_tx_queue_setup(struct rte_eth_dev *dev,
return 0;
}
static int
tap_mtu_set(struct rte_eth_dev *dev, uint16_t mtu)
{
struct pmd_internals *pmd = dev->data->dev_private;
struct ifreq ifr = { .ifr_mtu = mtu };
int err = 0;
err = tap_ioctl(pmd, SIOCSIFMTU, &ifr, 1);
if (!err)
dev->data->mtu = mtu;
return err;
}
static const struct eth_dev_ops ops = {
.dev_start = tap_dev_start,
.dev_stop = tap_dev_stop,
@ -709,6 +733,7 @@ static const struct eth_dev_ops ops = {
.allmulticast_enable = tap_allmulti_enable,
.allmulticast_disable = tap_allmulti_disable,
.mac_addr_set = tap_mac_set,
.mtu_set = tap_mtu_set,
.stats_get = tap_stats_get,
.stats_reset = tap_stats_reset,
};
@ -759,6 +784,7 @@ eth_dev_tap_create(const char *name, char *tap_name)
/* Setup some default values */
data->dev_private = pmd;
data->port_id = dev->data->port_id;
data->mtu = dev->data->mtu;
data->dev_flags = RTE_ETH_DEV_DETACHABLE;
data->kdrv = RTE_KDRV_NONE;
data->drv_name = pmd_tap_drv.driver.name;