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udev: introduce TxQueueLength= setting

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Enable udev to set the transmit queue length of a device via a new directive to
be used in link files. The kernel stores this parameter as an unsigned 32 bit
integer. As typical values currently range in the order of 10 to a few 10,000
packets reduce the domain of valid values for this directive to 0..4294967294
and take the excluded 4294967295 == UINT32_MAX to indicate that the directive
is unset.
This commit is contained in:
Ulrich Ölmann
2021-01-13 06:41:06 +01:00
parent 42e15a6f1a
commit ef4a91a7e8
7 changed files with 61 additions and 9 deletions
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src/libsystemd/sd-netlink/netlink-util.c
+9 -4
View File
@@ -57,16 +57,15 @@ int rtnl_set_link_name(sd_netlink **rtnl, int ifindex, const char *name) {
return 0;
}
int rtnl_set_link_properties(sd_netlink **rtnl, int ifindex, const char *alias,
const struct ether_addr *mac, uint32_t mtu,
uint32_t gso_max_size, size_t gso_max_segments) {
int rtnl_set_link_properties(sd_netlink **rtnl, int ifindex, const char *alias, const struct ether_addr *mac,
uint32_t txqueuelen, uint32_t mtu, uint32_t gso_max_size, size_t gso_max_segments) {
_cleanup_(sd_netlink_message_unrefp) sd_netlink_message *message = NULL;
int r;
assert(rtnl);
assert(ifindex > 0);
if (!alias && !mac && mtu == 0 && gso_max_size == 0 && gso_max_segments == 0)
if (!alias && !mac && txqueuelen == UINT32_MAX && mtu == 0 && gso_max_size == 0 && gso_max_segments == 0)
return 0;
if (!*rtnl) {
@@ -91,6 +90,12 @@ int rtnl_set_link_properties(sd_netlink **rtnl, int ifindex, const char *alias,
return r;
}
if (txqueuelen < UINT32_MAX) {
r = sd_netlink_message_append_u32(message, IFLA_TXQLEN, txqueuelen);
if (r < 0)
return r;
}
if (mtu != 0) {
r = sd_netlink_message_append_u32(message, IFLA_MTU, mtu);
if (r < 0)
src/libsystemd/sd-netlink/netlink-util.h
+2 -2
View File
@@ -70,8 +70,8 @@ static inline bool rtnl_message_type_is_mdb(uint16_t type) {
}
int rtnl_set_link_name(sd_netlink **rtnl, int ifindex, const char *name);
int rtnl_set_link_properties(sd_netlink **rtnl, int ifindex, const char *alias, const struct ether_addr *mac, uint32_t mtu,
uint32_t gso_max_size, size_t gso_max_segments);
int rtnl_set_link_properties(sd_netlink **rtnl, int ifindex, const char *alias, const struct ether_addr *mac,
uint32_t txqueuelen, uint32_t mtu, uint32_t gso_max_size, size_t gso_max_segments);
int rtnl_get_link_alternative_names(sd_netlink **rtnl, int ifindex, char ***ret);
int rtnl_set_link_alternative_names(sd_netlink **rtnl, int ifindex, char * const *alternative_names);
int rtnl_set_link_alternative_names_by_ifname(sd_netlink **rtnl, const char *ifname, char * const *alternative_names);