src/network/tc/drr.c

   1 /* SPDX-License-Identifier: LGPL-2.1+
   2  * Copyright © 2020 VMware, Inc. */
   3
   4 #include <linux/pkt_sched.h>
   5
   6 #include "alloc-util.h"
   7 #include "conf-parser.h"
   8 #include "drr.h"
   9 #include "netlink-util.h"
  10 #include "parse-util.h"
  11 #include "string-util.h"
  12
  13 const QDiscVTable drr_vtable = {
  14         .object_size = sizeof(DeficitRoundRobinScheduler),
  15         .tca_kind = "drr",
  16 };
  17
  18 static int drr_class_fill_message(Link *link, TClass *tclass, sd_netlink_message *req) {
  19         DeficitRoundRobinSchedulerClass *drr;
  20         int r;
  21
  22         assert(link);
  23         assert(tclass);
  24         assert(req);
  25
  26         drr = TCLASS_TO_DRR(tclass);
  27
  28         r = sd_netlink_message_open_container_union(req, TCA_OPTIONS, "drr");
  29         if (r < 0)
  30                 return log_link_error_errno(link, r, "Could not open container TCA_OPTIONS: %m");
  31
  32         if (drr->quantum > 0) {
  33                 r = sd_netlink_message_append_u32(req, TCA_DRR_QUANTUM, drr->quantum);
  34                 if (r < 0)
  35                         return log_link_error_errno(link, r, "Could not append TCA_DRR_QUANTUM, attribute: %m");
  36         }
  37
  38         r = sd_netlink_message_close_container(req);
  39         if (r < 0)
  40                 return log_link_error_errno(link, r, "Could not close container TCA_OPTIONS: %m");
  41
  42         return 0;
  43 }
  44
  45 int config_parse_drr_size(
  46                 const char *unit,
  47                 const char *filename,
  48                 unsigned line,
  49                 const char *section,
  50                 unsigned section_line,
  51                 const char *lvalue,
  52                 int ltype,
  53                 const char *rvalue,
  54                 void *data,
  55                 void *userdata) {
  56
  57         _cleanup_(tclass_free_or_set_invalidp) TClass *tclass = NULL;
  58         DeficitRoundRobinSchedulerClass *drr;
  59         Network *network = data;
  60         uint64_t u;
  61         int r;
  62
  63         assert(filename);
  64         assert(lvalue);
  65         assert(rvalue);
  66         assert(data);
  67
  68         r = tclass_new_static(TCLASS_KIND_DRR, network, filename, section_line, &tclass);
  69         if (r < 0)
  70                 return log_syntax(unit, LOG_ERR, filename, line, r,
  71                                   "Failed to create traffic control class, ignoring assignment: %m");
  72
  73         drr = TCLASS_TO_DRR(tclass);
  74
  75         if (isempty(rvalue)) {
  76                 drr->quantum = 0;
  77
  78                 tclass = NULL;
  79                 return 0;
  80         }
  81
  82         r = parse_size(rvalue, 1000, &u);
  83         if (r < 0) {
  84                 log_syntax(unit, LOG_ERR, filename, line, r,
  85                            "Failed to parse '%s=', ignoring assignment: %s",
  86                            lvalue, rvalue);
  87                 return 0;
  88         }
  89         if (u > UINT32_MAX) {
  90                 log_syntax(unit, LOG_ERR, filename, line, 0, "Invalid '%s=', ignoring assignment: %s",
  91                            lvalue, rvalue);
  92                 return 0;
  93         }
  94
  95         drr->quantum = (uint32_t) u;
  96
  97         tclass = NULL;
  98         return 0;
  99 }
 100
 101 const TClassVTable drr_tclass_vtable = {
 102         .object_size = sizeof(DeficitRoundRobinSchedulerClass),
 103         .tca_kind = "drr",
 104         .fill_message = drr_class_fill_message,
 105 };