efi: cache test results of boolean EFI state functions

EFI variable access is nowadays subject to rate limiting by the kernel.
Thus, let's cache the results of checking them, in order to minimize how
often we access them.

Fixes: #14828

man/systemd.link.xml

@@ -691,13 +691,29 @@
       <varlistentry>
         <term><varname>RxBufferSize=</varname></term>
         <listitem>
-          <para>Takes a integer. Specifies the NIC receive ring buffer size. When unset, the kernel's default will be used.</para>
+          <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>
+        </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>
+        </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>
         </listitem>
       </varlistentry>
       <varlistentry>
         <term><varname>TxBufferSize=</varname></term>
         <listitem>
-          <para>Takes a integer. Specifies the NIC transmit ring buffer size. When unset, the kernel's default will be used.</para>
+          <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>
         </listitem>
       </varlistentry>
       <varlistentry>

src/basic/efivars.c

@@ -244,10 +244,16 @@ int efi_set_variable_string(sd_id128_t vendor, const char *name, const char *v)
 }
 
 bool is_efi_boot(void) {
-        if (detect_container() > 0)
+        static int cache = -1;
-                return false;
 
-        return access("/sys/firmware/efi/", F_OK) >= 0;
+        if (cache < 0) {
+                if (detect_container() > 0)
+                        cache = false;
+                else
+                        cache = access("/sys/firmware/efi/", F_OK) >= 0;
+        }
+
+        return cache;
 }
 
 static int read_flag(const char *varname) {
@@ -271,11 +277,21 @@ static int read_flag(const char *varname) {
 }
 
 bool is_efi_secure_boot(void) {
-        return read_flag("SecureBoot") > 0;
+        static int cache = -1;
+
+        if (cache < 0)
+                cache = read_flag("SecureBoot");
+
+        return cache > 0;
 }
 
 bool is_efi_secure_boot_setup_mode(void) {
-        return read_flag("SetupMode") > 0;
+        static int cache = -1;
+
+        if (cache < 0)
+                cache = read_flag("SetupMode");
+
+        return cache > 0;
 }
 
 int systemd_efi_options_variable(char **line) {

src/shared/ethtool-util.c

@@ -431,18 +431,24 @@ int ethtool_set_nic_buffer_size(int *ethtool_fd, const char *ifname, netdev_ring
         if (r < 0)
                 return -errno;
 
-        if (ring->rx_pending_set) {
+        if (ring->rx_pending_set && ecmd.rx_pending != ring->rx_pending) {
-                if (ecmd.rx_pending != ring->rx_pending) {
                 ecmd.rx_pending = ring->rx_pending;
                 need_update = true;
         }
-        }
 
-        if (ring->tx_pending_set) {
+        if (ring->rx_mini_pending_set && ecmd.rx_mini_pending != ring->rx_mini_pending) {
-                   if (ecmd.tx_pending != ring->tx_pending) {
+                ecmd.rx_mini_pending = ring->rx_mini_pending;
-                           ecmd.tx_pending = ring->tx_pending;
                 need_update = true;
         }
+
+        if (ring->rx_jumbo_pending_set && ecmd.rx_jumbo_pending != ring->rx_jumbo_pending) {
+                ecmd.rx_jumbo_pending = ring->rx_jumbo_pending;
+                need_update = true;
+        }
+
+        if (ring->tx_pending_set && ecmd.tx_pending != ring->tx_pending) {
+                ecmd.tx_pending = ring->tx_pending;
+                need_update = true;
         }
 
         if (need_update) {
@@ -1036,6 +1042,12 @@ int config_parse_nic_buffer_size(const char *unit,
         if (streq(lvalue, "RxBufferSize")) {
                 ring->rx_pending = k;
                 ring->rx_pending_set = true;
+        } else if (streq(lvalue, "RxMiniBufferSize")) {
+                ring->rx_mini_pending = k;
+                ring->rx_mini_pending_set = true;
+        } else if (streq(lvalue, "RxJumboBufferSize")) {
+                ring->rx_jumbo_pending = k;
+                ring->rx_jumbo_pending_set = true;
         } else if (streq(lvalue, "TxBufferSize")) {
                 ring->tx_pending = k;
                 ring->tx_pending_set = true;

src/shared/ethtool-util.h

@@ -84,9 +84,13 @@ typedef struct netdev_channels {
 
 typedef struct netdev_ring_param {
         uint32_t rx_pending;
+        uint32_t rx_mini_pending;
+        uint32_t rx_jumbo_pending;
         uint32_t tx_pending;
 
         bool rx_pending_set;
+        bool rx_mini_pending_set;
+        bool rx_jumbo_pending_set;
         bool tx_pending_set;
 } netdev_ring_param;
 

src/udev/net/link-config-gperf.gperf

@@ -59,6 +59,8 @@ Link.OtherChannels,              config_parse_channel,                  0,
 Link.CombinedChannels,           config_parse_channel,                  0,                             offsetof(link_config, channels)
 Link.Advertise,                  config_parse_advertise,                0,                             offsetof(link_config, advertise)
 Link.RxBufferSize,               config_parse_nic_buffer_size,          0,                             offsetof(link_config, ring)
+Link.RxMiniBufferSize,           config_parse_nic_buffer_size,          0,                             offsetof(link_config, ring)
+Link.RxJumboBufferSize,          config_parse_nic_buffer_size,          0,                             offsetof(link_config, ring)
 Link.TxBufferSize,               config_parse_nic_buffer_size,          0,                             offsetof(link_config, ring)
 Link.RxFlowControl,              config_parse_tristate,                 0,                             offsetof(link_config, rx_flow_control)
 Link.TxFlowControl,              config_parse_tristate,                 0,                             offsetof(link_config, tx_flow_control)

src/udev/net/link-config.c

@@ -407,7 +407,7 @@ int link_config_apply(link_config_ctx *ctx, link_config *config,
                         log_warning_errno(r, "Could not set channels of %s: %m", old_name);
         }
 
-        if (config->ring.rx_pending_set || config->ring.tx_pending_set) {
+        if (config->ring.rx_pending_set || config->ring.rx_mini_pending_set || config->ring.rx_jumbo_pending_set || config->ring.tx_pending_set) {
                 r = ethtool_set_nic_buffer_size(&ctx->ethtool_fd, old_name, &config->ring);
                 if (r < 0)
                         log_warning_errno(r, "Could not set ring buffer of %s: %m", old_name);

test/fuzz/fuzz-link-parser/directives.link

@@ -40,6 +40,8 @@ OtherChannels=
 CombinedChannels=
 Advertise=
 RxBufferSize=
+RxMiniBufferSize=
+RxJumboBufferSize=
 TxBufferSize=
 RxFlowControl=
 TxFlowControl=