X-Git-Url: https://pintos-os.org/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=lib%2Fdpif-linux.c;h=fa8eea6e7a26c3c5ac4ceaa1869a7a774c5f3a73;hb=2c360fbb2777fba6d35599e4b53287e2ecb26fa9;hp=bdc7703697f1e7b9584d4b558c68e4920a72882b;hpb=d0c23a1a57f5bd994d3af124673a218e21528dd3;p=openvswitch

diff --git a/lib/dpif-linux.c b/lib/dpif-linux.c
index bdc77036..fa8eea6e 100644
--- a/lib/dpif-linux.c
+++ b/lib/dpif-linux.c
@@ -32,6 +32,7 @@
 #include <sys/stat.h>
 #include <unistd.h>
 
+#include "bitmap.h"
 #include "dpif-provider.h"
 #include "netdev.h"
 #include "netdev-vport.h"
@@ -52,6 +53,10 @@
 
 VLOG_DEFINE_THIS_MODULE(dpif_linux);
 
+enum { LRU_MAX_PORTS = 1024 };
+enum { LRU_MASK = LRU_MAX_PORTS - 1};
+BUILD_ASSERT_DECL(IS_POW2(LRU_MAX_PORTS));
+
 struct dpif_linux_dp {
     /* Generic Netlink header. */
     uint8_t cmd;
@@ -128,6 +133,12 @@ struct dpif_linux {
     struct sset changed_ports;  /* Ports that have changed. */
     struct rtnetlink_notifier port_notifier;
     bool change_error;
+
+    /* Queue of unused ports. */
+    unsigned long *lru_bitmap;
+    uint16_t lru_ports[LRU_MAX_PORTS];
+    size_t lru_head;
+    size_t lru_tail;
 };
 
 static struct vlog_rate_limit error_rl = VLOG_RATE_LIMIT_INIT(9999, 5);
@@ -158,6 +169,29 @@ dpif_linux_cast(const struct dpif *dpif)
     return CONTAINER_OF(dpif, struct dpif_linux, dpif);
 }
 
+static void
+dpif_linux_push_port(struct dpif_linux *dp, uint16_t port)
+{
+    if (port < LRU_MAX_PORTS && !bitmap_is_set(dp->lru_bitmap, port)) {
+        bitmap_set1(dp->lru_bitmap, port);
+        dp->lru_ports[dp->lru_head++ & LRU_MASK] = port;
+    }
+}
+
+static uint32_t
+dpif_linux_pop_port(struct dpif_linux *dp)
+{
+    uint16_t port;
+
+    if (dp->lru_head == dp->lru_tail) {
+        return UINT32_MAX;
+    }
+
+    port = dp->lru_ports[dp->lru_tail++ & LRU_MASK];
+    bitmap_set0(dp->lru_bitmap, port);
+    return port;
+}
+
 static int
 dpif_linux_enumerate(struct sset *all_dps)
 {
@@ -235,6 +269,12 @@ open_dpif(const struct dpif_linux_dp *dp, struct dpif **dpifp)
     dpif->change_error = false;
     *dpifp = &dpif->dpif;
 
+    dpif->lru_head = dpif->lru_tail = 0;
+    dpif->lru_bitmap = bitmap_allocate(LRU_MAX_PORTS);
+    bitmap_set1(dpif->lru_bitmap, ODPP_LOCAL);
+    for (i = 1; i < LRU_MAX_PORTS; i++) {
+        dpif_linux_push_port(dpif, i);
+    }
     return 0;
 
 error_free:
@@ -248,6 +288,7 @@ dpif_linux_close(struct dpif *dpif_)
     struct dpif_linux *dpif = dpif_linux_cast(dpif_);
     rtnetlink_link_notifier_unregister(&dpif->port_notifier);
     sset_destroy(&dpif->changed_ports);
+    free(dpif->lru_bitmap);
     free(dpif);
 }
 
@@ -336,11 +377,17 @@ dpif_linux_port_add(struct dpif *dpif_, struct netdev *netdev,
         request.options_len = options->size;
     }
 
-    error = dpif_linux_vport_transact(&request, &reply, &buf);
-    if (!error) {
-        *port_nop = reply.port_no;
+    /* Loop until we find a port that isn't used. */
+    do {
+        request.port_no = dpif_linux_pop_port(dpif);
+        error = dpif_linux_vport_transact(&request, &reply, &buf);
+
+        if (!error) {
+            *port_nop = reply.port_no;
+        }
         ofpbuf_delete(buf);
-    }
+    } while (request.port_no != UINT32_MAX
+             && (error == EBUSY || error == EFBIG));
 
     return error;
 }
@@ -350,12 +397,18 @@ dpif_linux_port_del(struct dpif *dpif_, uint16_t port_no)
 {
     struct dpif_linux *dpif = dpif_linux_cast(dpif_);
     struct dpif_linux_vport vport;
+    int error;
 
     dpif_linux_vport_init(&vport);
     vport.cmd = ODP_VPORT_CMD_DEL;
     vport.dp_ifindex = dpif->dp_ifindex;
     vport.port_no = port_no;
-    return dpif_linux_vport_transact(&vport, NULL, NULL);
+    error = dpif_linux_vport_transact(&vport, NULL, NULL);
+
+    if (!error) {
+        dpif_linux_push_port(dpif, port_no);
+    }
+    return error;
 }
 
 static int
@@ -1019,7 +1072,7 @@ dpif_linux_is_internal_device(const char *name)
     error = dpif_linux_vport_get(name, &reply, &buf);
     if (!error) {
         ofpbuf_delete(buf);
-    } else if (error != ENODEV) {
+    } else if (error != ENODEV && error != ENOENT) {
         VLOG_WARN_RL(&error_rl, "%s: vport query failed (%s)",
                      name, strerror(error));
     }
@@ -1027,6 +1080,34 @@ dpif_linux_is_internal_device(const char *name)
     return reply.type == ODP_VPORT_TYPE_INTERNAL;
 }
 
+int
+dpif_linux_vport_send(int dp_ifindex, uint32_t port_no,
+                      const void *data, size_t size)
+{
+    struct odp_header *execute;
+    struct ofpbuf *buf;
+    size_t actions_ofs;
+    int error;
+
+    buf = ofpbuf_new(128 + size);
+
+    nl_msg_put_genlmsghdr(buf, 0, odp_packet_family, NLM_F_REQUEST,
+                          ODP_PACKET_CMD_EXECUTE, 1);
+
+    execute = ofpbuf_put_uninit(buf, sizeof *execute);
+    execute->dp_ifindex = dp_ifindex;
+
+    nl_msg_put_unspec(buf, ODP_PACKET_ATTR_PACKET, data, size);
+
+    actions_ofs = nl_msg_start_nested(buf, ODP_PACKET_ATTR_ACTIONS);
+    nl_msg_put_u32(buf, ODP_ACTION_ATTR_OUTPUT, port_no);
+    nl_msg_end_nested(buf, actions_ofs);
+
+    error = nl_sock_transact(genl_sock, buf, NULL);
+    ofpbuf_delete(buf);
+    return error;
+}
+
 static void
 dpif_linux_port_changed(const struct rtnetlink_link_change *change,
                         void *dpif_)
@@ -1201,6 +1282,15 @@ dpif_linux_vport_transact(const struct dpif_linux_vport *request,
 
     assert((reply != NULL) == (bufp != NULL));
 
+    error = dpif_linux_init();
+    if (error) {
+        if (reply) {
+            *bufp = NULL;
+            dpif_linux_vport_init(reply);
+        }
+        return error;
+    }
+
     request_buf = ofpbuf_new(1024);
     dpif_linux_vport_to_ofpbuf(request, request_buf);
     error = nl_sock_transact(genl_sock, request_buf, bufp);