network: TC introduce PFIFO

4 files changed, 107 insertions, 0 deletions

diff --git a/src/network/tc/fifo.c b/src/network/tc/fifo.c
new file mode 100644
index 0000000000..2d2a863e3a
--- /dev/null
+++ b/src/network/tc/fifo.c
@@ -0,0 +1,87 @@
+/* SPDX-License-Identifier: LGPL-2.1+
+ * Copyright © 2020 VMware, Inc. */
+
+#include <linux/pkt_sched.h>
+
+#include "alloc-util.h"
+#include "conf-parser.h"
+#include "fifo.h"
+#include "netlink-util.h"
+#include "parse-util.h"
+#include "string-util.h"
+
+static int fifo_fill_message(Link *link, QDisc *qdisc, sd_netlink_message *req) {
+        struct tc_fifo_qopt opt = {};
+        FirstInFirstOut *fifo;
+        int r;
+
+        assert(link);
+        assert(qdisc);
+        assert(req);
+
+        fifo = PFIFO(qdisc);
+
+        opt.limit = fifo->limit;
+
+        r = sd_netlink_message_append_data(req, TCA_OPTIONS, &opt, sizeof(struct tc_fifo_qopt));
+        if (r < 0)
+                return log_link_error_errno(link, r, "Could not append TCA_OPTIONS attribute: %m");
+
+        return 0;
+}
+
+int config_parse_fifo_size(
+                const char *unit,
+                const char *filename,
+                unsigned line,
+                const char *section,
+                unsigned section_line,
+                const char *lvalue,
+                int ltype,
+                const char *rvalue,
+                void *data,
+                void *userdata) {
+
+        _cleanup_(qdisc_free_or_set_invalidp) QDisc *qdisc = NULL;
+        Network *network = data;
+        FirstInFirstOut *fifo;
+        int r;
+
+        assert(filename);
+        assert(lvalue);
+        assert(rvalue);
+        assert(data);
+
+        r = qdisc_new_static(QDISC_KIND_PFIFO, network, filename, section_line, &qdisc);
+        if (r == -ENOMEM)
+                return log_oom();
+        if (r < 0)
+                return log_syntax(unit, LOG_ERR, filename, line, r,
+                                  "More than one kind of queueing discipline, ignoring assignment: %m");
+
+        fifo = PFIFO(qdisc);
+
+        if (isempty(rvalue)) {
+                fifo->limit = 0;
+
+                qdisc = NULL;
+                return 0;
+        }
+
+        r = safe_atou32(rvalue, &fifo->limit);
+        if (r < 0) {
+                log_syntax(unit, LOG_ERR, filename, line, r,
+                           "Failed to parse '%s=', ignoring assignment: %s",
+                           lvalue, rvalue);
+                return 0;
+        }
+
+        qdisc = NULL;
+        return 0;
+}
+
+const QDiscVTable pfifo_vtable = {
+        .object_size = sizeof(FirstInFirstOut),
+        .tca_kind = "pfifo",
+        .fill_message = fifo_fill_message,
+};
diff --git a/src/network/tc/fifo.h b/src/network/tc/fifo.h
new file mode 100644
index 0000000000..02976568dd
--- /dev/null
+++ b/src/network/tc/fifo.h
@@ -0,0 +1,17 @@
+/* SPDX-License-Identifier: LGPL-2.1+
+ * Copyright © 2020 VMware, Inc. */
+#pragma once
+
+#include "conf-parser.h"
+#include "qdisc.h"
+
+typedef struct FirstInFirstOut {
+        QDisc meta;
+
+        uint32_t limit;
+} FirstInFirstOut;
+
+DEFINE_QDISC_CAST(PFIFO, FirstInFirstOut);
+extern const QDiscVTable pfifo_vtable;
+
+CONFIG_PARSER_PROTOTYPE(config_parse_fifo_size);
diff --git a/src/network/tc/qdisc.c b/src/network/tc/qdisc.c
index 2168234a71..01b89ca5ad 100644
--- a/src/network/tc/qdisc.c
+++ b/src/network/tc/qdisc.c
@@ -21,6 +21,7 @@ const QDiscVTable * const qdisc_vtable[_QDISC_KIND_MAX] = {
         [QDISC_KIND_FQ_CODEL] = &fq_codel_vtable,
         [QDISC_KIND_HTB] = &htb_vtable,
         [QDISC_KIND_NETEM] = &netem_vtable,
+        [QDISC_KIND_PFIFO] = &pfifo_vtable,
         [QDISC_KIND_SFQ] = &sfq_vtable,
         [QDISC_KIND_TBF] = &tbf_vtable,
         [QDISC_KIND_TEQL] = &teql_vtable,
diff --git a/src/network/tc/qdisc.h b/src/network/tc/qdisc.h
index f33939d197..0de13bd51a 100644
--- a/src/network/tc/qdisc.h
+++ b/src/network/tc/qdisc.h
@@ -14,6 +14,7 @@ typedef enum QDiscKind {
         QDISC_KIND_FQ_CODEL,
         QDISC_KIND_HTB,
         QDISC_KIND_NETEM,
+        QDISC_KIND_PFIFO,
         QDISC_KIND_SFQ,
         QDISC_KIND_TBF,
         QDISC_KIND_TEQL,
@@ -75,6 +76,7 @@ CONFIG_PARSER_PROTOTYPE(config_parse_qdisc_parent);
 CONFIG_PARSER_PROTOTYPE(config_parse_qdisc_handle);
 
 #include "codel.h"
+#include "fifo.h"
 #include "fq-codel.h"
 #include "fq.h"
 #include "htb.h"