[dpdk-dev] [PATCH] lpm: rte_lpm_iterate() - iterate through the routes
chunguang yang
chunguang.yang at windriver.com
Fri Nov 25 07:31:31 CET 2016
From: Jörgen Grahn <grahn+src at snipabacken.se>
In practice, there's a need to iterate through the entries
of a rte_lpm, apart from the usual insert/delete/lookup
operations. This is useful for debugging and perhaps for
things like removing all entries referencing a certain nexthop.
This patch implements this through rte_lpm_iterate(), which
uses a cursor (or iterator) to keep track of the current
position. Client code doesn't need to be aware of rte_lpm
implementation details.
Change-Id: I28ea3d7d92f318988444553ee2bb30b709bcb3b6
Signed-off-by: Jorgen Grahn <jorgen.grahn at hiq.se>
Signed-off-by: alloc <alloc.young at gmail.com>
---
lib/librte_lpm/Makefile | 4 +-
lib/librte_lpm/rte_lpm_iterate.c | 81 ++++++++++++++++++++++++++++++++++++++++
lib/librte_lpm/rte_lpm_iterate.h | 56 +++++++++++++++++++++++++++
3 files changed, 139 insertions(+), 2 deletions(-)
create mode 100644 lib/librte_lpm/rte_lpm_iterate.c
create mode 100644 lib/librte_lpm/rte_lpm_iterate.h
diff --git a/lib/librte_lpm/Makefile b/lib/librte_lpm/Makefile
index 3dc549d..c45da19 100644
--- a/lib/librte_lpm/Makefile
+++ b/lib/librte_lpm/Makefile
@@ -42,10 +42,10 @@ EXPORT_MAP := rte_lpm_version.map
LIBABIVER := 2
# all source are stored in SRCS-y
-SRCS-$(CONFIG_RTE_LIBRTE_LPM) := rte_lpm.c rte_lpm6.c
+SRCS-$(CONFIG_RTE_LIBRTE_LPM) := rte_lpm.c rte_lpm6.c rte_lpm_iterate.c
# install this header file
-SYMLINK-$(CONFIG_RTE_LIBRTE_LPM)-include := rte_lpm.h rte_lpm6.h
+SYMLINK-$(CONFIG_RTE_LIBRTE_LPM)-include := rte_lpm.h rte_lpm6.h rte_lpm_iterate.h
ifneq ($(filter y,$(CONFIG_RTE_ARCH_ARM) $(CONFIG_RTE_ARCH_ARM64)),)
SYMLINK-$(CONFIG_RTE_LIBRTE_LPM)-include += rte_lpm_neon.h
diff --git a/lib/librte_lpm/rte_lpm_iterate.c b/lib/librte_lpm/rte_lpm_iterate.c
new file mode 100644
index 0000000..f643764
--- /dev/null
+++ b/lib/librte_lpm/rte_lpm_iterate.c
@@ -0,0 +1,81 @@
+/*-
+ * BSD LICENSE
+ *
+ * Copyright(c) 2014 Jörgen Grahn. All rights reserved.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * * Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in
+ * the documentation and/or other materials provided with the
+ * distribution.
+ * * Neither the name of Intel Corporation nor the names of its
+ * contributors may be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+#include "rte_lpm_iterate.h"
+#include "rte_lpm.h"
+
+#include <arpa/inet.h>
+
+
+/**
+ * Iterate through the lpm, pulling out at most 'buflen' valid routes
+ * (less means we've hit the end). The cursor should be initialized
+ * to { 0, 0 } before the first call.
+ *
+ * The routes are partially sorted, by prefix length. Undefined
+ * results if the lpm is modified in parallel with or inbetween calls,
+ * although the iteration will still terminate properly.
+ */
+unsigned
+rte_lpm_iterate(struct rte_lpm_route* const buf, unsigned buflen,
+ const struct rte_lpm* lpm,
+ struct rte_lpm_cursor* const cursor)
+{
+ struct rte_lpm_route* p = buf;
+ struct rte_lpm_route* const end = p + buflen;
+
+ const struct rte_lpm_rule_info* const rinfo = lpm->rule_info;
+ const struct rte_lpm_rule* const rtbl = lpm->rules_tbl;
+
+ unsigned d = cursor->d;
+ unsigned n = cursor->n;
+
+ while(p!=end) {
+ if(d==32) break;
+ if(n>=rinfo[d].used_rules) {
+ d++;
+ n = 0;
+ continue;
+ }
+ const struct rte_lpm_rule rule = rtbl[rinfo[d].first_rule + n];
+ p->addr.s_addr = htonl(rule.ip);
+ p->plen = d+1;
+ p->nh = rule.next_hop;
+ p++;
+ n++;
+ }
+
+ cursor->d = d;
+ cursor->n = n;
+
+ return p - buf;
+}
diff --git a/lib/librte_lpm/rte_lpm_iterate.h b/lib/librte_lpm/rte_lpm_iterate.h
new file mode 100644
index 0000000..25c7841
--- /dev/null
+++ b/lib/librte_lpm/rte_lpm_iterate.h
@@ -0,0 +1,56 @@
+/*-
+ * BSD LICENSE
+ *
+ * Copyright(c) 2014 Jörgen Grahn. All rights reserved.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * * Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in
+ * the documentation and/or other materials provided with the
+ * distribution.
+ * * Neither the name of Intel Corporation nor the names of its
+ * contributors may be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+#ifndef _RTE_LPM_ITERATE_H_
+#define _RTE_LPM_ITERATE_H_
+
+#include <stdint.h>
+#include <netinet/in.h>
+
+struct rte_lpm;
+
+struct rte_lpm_cursor {
+ unsigned d;
+ unsigned n;
+};
+
+struct rte_lpm_route {
+ struct in_addr addr;
+ uint8_t plen;
+ uint8_t nh;
+};
+
+unsigned rte_lpm_iterate(struct rte_lpm_route* buf, unsigned buflen,
+ const struct rte_lpm* lpm,
+ struct rte_lpm_cursor* cursor);
+
+#endif
--
2.7.4
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