rocker: add new rocker switch device

Rocker is a simulated ethernet switch device.  The device supports up to 62
front-panel ports and supports L2 switching and L3 routing functions, as well
as L2/L3/L4 ACLs.  The device presents a single PCI device for each switch,
with a memory-mapped register space for device driver access.

Rocker device is invoked with -device, for example a 4-port switch:

  -device rocker,name=sw1,len-ports=4,ports[0]=dev0,ports[1]=dev1, \
         ports[2]=dev2,ports[3]=dev3

Each port is a netdev and can be paired with using -netdev id=<port name>.

Signed-off-by: Scott Feldman <sfeldma@gmail.com>
Signed-off-by: Jiri Pirko <jiri@resnulli.us>
Acked-by: Scott Feldman <sfeldma@gmail.com>
Acked-by: Jiri Pirko <jiri@resnulli.us>
Signed-off-by: David Ahern <dsahern@gmail.com>
Message-id: 1426306173-24884-7-git-send-email-sfeldma@gmail.com

rocker: fix clang compiler errors

Consolidate all forward typedef declarations to rocker.h.

Signed-off-by: David Ahern <dsahern@gmail.com>
Acked-by: Scott Feldman <sfeldma@gmail.com>
Acked-by: Jiri Pirko <jiri@resnulli.us>

rocker: add support for flow modification

We had support for flow add/del.  This adds support for flow mod.  I needed
this for L3 support where an existing route is modified using NLM_F_REPLACE.
For example:

  ip route add 12.0.0.0/30 nexthop via 11.0.0.1 dev swp1
  ip route change 12.0.0.0/30 nexthop via 11.0.0.9 dev swp2

The first cmd adds the route.  The second cmd changes the existing route by
changing its nexthop info.

In the device, a mod operation results in the matching flow enty being modified
with the new settings.  This is atomic to the device.

Signed-off-by: Scott Feldman <sfeldma@gmail.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>

1 files changed, 234 insertions, 0 deletions

diff --git a/hw/net/rocker/rocker_fp.c b/hw/net/rocker/rocker_fp.c
new file mode 100644
index 0000000000..2f1e3b348a
--- /dev/null
+++ b/hw/net/rocker/rocker_fp.c
@@ -0,0 +1,234 @@
+/*
+ * QEMU rocker switch emulation - front-panel ports
+ *
+ * Copyright (c) 2014 Scott Feldman <sfeldma@gmail.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#include "net/clients.h"
+
+#include "rocker.h"
+#include "rocker_hw.h"
+#include "rocker_fp.h"
+#include "rocker_world.h"
+
+enum duplex {
+    DUPLEX_HALF = 0,
+    DUPLEX_FULL
+};
+
+struct fp_port {
+    Rocker *r;
+    World *world;
+    unsigned int index;
+    char *name;
+    uint32_t pport;
+    bool enabled;
+    uint32_t speed;
+    uint8_t duplex;
+    uint8_t autoneg;
+    uint8_t learning;
+    NICState *nic;
+    NICConf conf;
+};
+
+bool fp_port_get_link_up(FpPort *port)
+{
+    return !qemu_get_queue(port->nic)->link_down;
+}
+
+void fp_port_get_macaddr(FpPort *port, MACAddr *macaddr)
+{
+    memcpy(macaddr->a, port->conf.macaddr.a, sizeof(macaddr->a));
+}
+
+void fp_port_set_macaddr(FpPort *port, MACAddr *macaddr)
+{
+/* XXX TODO implement and test setting mac addr
+ * XXX memcpy(port->conf.macaddr.a, macaddr.a, sizeof(port->conf.macaddr.a));
+ */
+}
+
+uint8_t fp_port_get_learning(FpPort *port)
+{
+    return port->learning;
+}
+
+void fp_port_set_learning(FpPort *port, uint8_t learning)
+{
+    port->learning = learning;
+}
+
+int fp_port_get_settings(FpPort *port, uint32_t *speed,
+                         uint8_t *duplex, uint8_t *autoneg)
+{
+    *speed = port->speed;
+    *duplex = port->duplex;
+    *autoneg = port->autoneg;
+
+    return ROCKER_OK;
+}
+
+int fp_port_set_settings(FpPort *port, uint32_t speed,
+                         uint8_t duplex, uint8_t autoneg)
+{
+    /* XXX validate inputs */
+
+    port->speed = speed;
+    port->duplex = duplex;
+    port->autoneg = autoneg;
+
+    return ROCKER_OK;
+}
+
+bool fp_port_from_pport(uint32_t pport, uint32_t *port)
+{
+    if (pport < 1 || pport > ROCKER_FP_PORTS_MAX) {
+        return false;
+    }
+    *port = pport - 1;
+    return true;
+}
+
+int fp_port_eg(FpPort *port, const struct iovec *iov, int iovcnt)
+{
+    NetClientState *nc = qemu_get_queue(port->nic);
+
+    if (port->enabled) {
+        qemu_sendv_packet(nc, iov, iovcnt);
+    }
+
+    return ROCKER_OK;
+}
+
+static int fp_port_can_receive(NetClientState *nc)
+{
+    FpPort *port = qemu_get_nic_opaque(nc);
+
+    return port->enabled;
+}
+
+static ssize_t fp_port_receive_iov(NetClientState *nc, const struct iovec *iov,
+                                   int iovcnt)
+{
+    FpPort *port = qemu_get_nic_opaque(nc);
+
+    return world_ingress(port->world, port->pport, iov, iovcnt);
+}
+
+static ssize_t fp_port_receive(NetClientState *nc, const uint8_t *buf,
+                               size_t size)
+{
+    const struct iovec iov = {
+        .iov_base = (uint8_t *)buf,
+        .iov_len = size
+    };
+
+    return fp_port_receive_iov(nc, &iov, 1);
+}
+
+static void fp_port_cleanup(NetClientState *nc)
+{
+}
+
+static void fp_port_set_link_status(NetClientState *nc)
+{
+    FpPort *port = qemu_get_nic_opaque(nc);
+
+    rocker_event_link_changed(port->r, port->pport, !nc->link_down);
+}
+
+static NetClientInfo fp_port_info = {
+    .type = NET_CLIENT_OPTIONS_KIND_NIC,
+    .size = sizeof(NICState),
+    .can_receive = fp_port_can_receive,
+    .receive = fp_port_receive,
+    .receive_iov = fp_port_receive_iov,
+    .cleanup = fp_port_cleanup,
+    .link_status_changed = fp_port_set_link_status,
+};
+
+World *fp_port_get_world(FpPort *port)
+{
+    return port->world;
+}
+
+void fp_port_set_world(FpPort *port, World *world)
+{
+    DPRINTF("port %d setting world \"%s\"\n", port->index, world_name(world));
+    port->world = world;
+}
+
+bool fp_port_enabled(FpPort *port)
+{
+    return port->enabled;
+}
+
+void fp_port_enable(FpPort *port)
+{
+    port->enabled = true;
+    DPRINTF("port %d enabled\n", port->index);
+}
+
+void fp_port_disable(FpPort *port)
+{
+    port->enabled = false;
+    DPRINTF("port %d disabled\n", port->index);
+}
+
+FpPort *fp_port_alloc(Rocker *r, char *sw_name,
+                      MACAddr *start_mac, unsigned int index,
+                      NICPeers *peers)
+{
+    FpPort *port = g_malloc0(sizeof(FpPort));
+
+    if (!port) {
+        return NULL;
+    }
+
+    port->r = r;
+    port->index = index;
+    port->pport = index + 1;
+
+    /* front-panel switch port names are 1-based */
+
+    port->name = g_strdup_printf("%s.%d", sw_name, port->pport);
+
+    memcpy(port->conf.macaddr.a, start_mac, sizeof(port->conf.macaddr.a));
+    port->conf.macaddr.a[5] += index;
+    port->conf.bootindex = -1;
+    port->conf.peers = *peers;
+
+    port->nic = qemu_new_nic(&fp_port_info, &port->conf,
+                             sw_name, NULL, port);
+    qemu_format_nic_info_str(qemu_get_queue(port->nic),
+                             port->conf.macaddr.a);
+
+    fp_port_reset(port);
+
+    return port;
+}
+
+void fp_port_free(FpPort *port)
+{
+    qemu_del_nic(port->nic);
+    g_free(port->name);
+    g_free(port);
+}
+
+void fp_port_reset(FpPort *port)
+{
+    fp_port_disable(port);
+    port->speed = 10000;   /* 10Gbps */
+    port->duplex = DUPLEX_FULL;
+    port->autoneg = 0;
+}