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udev: Support "max" string for BufferSize options (#20458)

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"max" indicates the hardware advertised maximum queue buffer size
should be used.

The max sizes can be checked by running `ethtool -g <dev>` (Preset maximums).
Since the buffer sizes can't be set to 0 by users, internally we use 0 to
indicate that the hardware advertised maximum should be used.
This commit is contained in:
Daan De Meyer 2021-08-18 07:59:13 +01:00 committed by GitHub
parent 91546abf9e
commit 406041b7de
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GPG Key ID: 4AEE18F83AFDEB23
3 changed files with 40 additions and 22 deletions
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20
man/systemd.link.xml
View File

@ -735,29 +735,33 @@
<varlistentry>
<term><varname>RxBufferSize=</varname></term>
<listitem>
<para>Takes an integer. Specifies the maximum number of pending packets in the NIC receive buffer.
When unset, the kernel's default will be used.</para>
<para>Takes an integer or <literal>max</literal>. Specifies the maximum number of pending packets
in the NIC receive buffer. When unset, the kernel's default will be used. If set to
<literal>max</literal>, the hardware's advertised maximum size will be used.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><varname>RxMiniBufferSize=</varname></term>
<listitem>
<para>Takes an integer. Specifies the maximum number of pending packets in the NIC mini receive buffer.
When unset, the kernel's default will be used.</para>
<para>Takes an integer or <literal>max</literal>. Specifies the maximum number of pending packets
in the NIC mini receive buffer. When unset, the kernel's default will be used. If set to
<literal>max</literal>, the hardware's advertised maximum size will be used.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><varname>RxJumboBufferSize=</varname></term>
<listitem>
<para>Takes an integer. Specifies the maximum number of pending packets in the NIC jumbo receive buffer.
When unset, the kernel's default will be used.</para>
<para>Takes an integer or <literal>max</literal>. Specifies the maximum number of pending packets
in the NIC jumbo receive buffer. When unset, the kernel's default will be used. If set to
<literal>max</literal>, the hardware's advertised maximum size will be used.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><varname>TxBufferSize=</varname></term>
<listitem>
<para>Takes an integer. Specifies the maximum number of pending packets in the NIC transmit buffer.
When unset, the kernel's default will be used.</para>
<para>Takes an integer or <literal>max</literal>. Specifies the maximum number of pending packets
in the NIC transmit buffer. When unset, the kernel's default will be used. If set to
<literal>max</literal>, the hardware's advertised maximum size will be used.</para>
</listitem>
</varlistentry>
<varlistentry>

40
src/shared/ethtool-util.c
View File

@ -399,16 +399,24 @@ int ethtool_set_nic_buffer_size(int *ethtool_fd, const char *ifname, const netde
return -errno;
if (ring->rx_pending_set)
UPDATE(ecmd.rx_pending, ring->rx_pending, need_update);
UPDATE(ecmd.rx_pending,
ring->rx_pending == 0 ? ecmd.rx_max_pending : ring->rx_pending,
need_update);
if (ring->rx_mini_pending_set)
UPDATE(ecmd.rx_mini_pending, ring->rx_mini_pending, need_update);
UPDATE(ecmd.rx_mini_pending,
ring->rx_mini_pending == 0 ? ecmd.rx_mini_max_pending : ring->rx_mini_pending,
need_update);
if (ring->rx_jumbo_pending_set)
UPDATE(ecmd.rx_jumbo_pending, ring->rx_jumbo_pending, need_update);
UPDATE(ecmd.rx_jumbo_pending,
ring->rx_jumbo_pending == 0 ? ecmd.rx_jumbo_max_pending : ring->rx_jumbo_pending,
need_update);
if (ring->tx_pending_set)
UPDATE(ecmd.tx_pending, ring->tx_pending, need_update);
UPDATE(ecmd.tx_pending,
ring->tx_pending == 0 ? ecmd.tx_max_pending : ring->tx_pending,
need_update);
if (!need_update)
return 0;
@ -1047,16 +1055,20 @@ int config_parse_nic_buffer_size(
assert(rvalue);
assert(data);
r = safe_atou32(rvalue, &k);
if (r < 0) {
log_syntax(unit, LOG_WARNING, filename, line, r,
"Failed to parse interface buffer value, ignoring: %s", rvalue);
return 0;
}
if (k < 1) {
log_syntax(unit, LOG_WARNING, filename, line, 0,
"Invalid %s= value, ignoring: %s", lvalue, rvalue);
return 0;
if (streq(rvalue, "max"))
k = 0;
else {
r = safe_atou32(rvalue, &k);
if (r < 0) {
log_syntax(unit, LOG_WARNING, filename, line, r,
"Failed to parse interface buffer value, ignoring: %s", rvalue);
return 0;
}
if (k < 1) {
log_syntax(unit, LOG_WARNING, filename, line, 0,
"Invalid %s= value, ignoring: %s", lvalue, rvalue);
return 0;
}
}
if (streq(lvalue, "RxBufferSize")) {

2
src/shared/ethtool-util.h
View File

@ -70,6 +70,8 @@ typedef struct netdev_channels {
} netdev_channels;
typedef struct netdev_ring_param {
/* For any of the 4 following settings, a value of 0 indicates the hardware advertised maximum should
* be used. */
uint32_t rx_pending;
uint32_t rx_mini_pending;
uint32_t rx_jumbo_pending;