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rte_lpm.h(3) DPDK rte_lpm.h(3)

NAME

rte_lpm.h

SYNOPSIS

#include <errno.h>
#include <stdint.h>
#include <rte_branch_prediction.h>
#include <rte_byteorder.h>
#include <rte_common.h>
#include <rte_vect.h>
#include <rte_rcu_qsbr.h>
#include 'rte_lpm_scalar.h'

Data Structures


struct rte_lpm_config
struct rte_lpm_rcu_config

Macros


#define RTE_LPM_NAMESIZE 32
#define RTE_LPM_MAX_DEPTH 32
#define RTE_LPM_LOOKUP_SUCCESS 0x01000000
#define rte_lpm_lookup_bulk(lpm, ips, next_hops, n) rte_lpm_lookup_bulk_func(lpm, ips, next_hops, n)

Enumerations


enum rte_lpm_qsbr_mode { RTE_LPM_QSBR_MODE_DQ = 0, RTE_LPM_QSBR_MODE_SYNC }

Functions


struct rte_lpm * rte_lpm_create (const char *name, int socket_id, const struct rte_lpm_config *config)
struct rte_lpm * rte_lpm_find_existing (const char *name)
void rte_lpm_free (struct rte_lpm *lpm)
int rte_lpm_rcu_qsbr_add (struct rte_lpm *lpm, struct rte_lpm_rcu_config *cfg)
int rte_lpm_add (struct rte_lpm *lpm, uint32_t ip, uint8_t depth, uint32_t next_hop)
int rte_lpm_is_rule_present (struct rte_lpm *lpm, uint32_t ip, uint8_t depth, uint32_t *next_hop)
int rte_lpm_delete (struct rte_lpm *lpm, uint32_t ip, uint8_t depth)
void rte_lpm_delete_all (struct rte_lpm *lpm)
static int rte_lpm_lookup (const struct rte_lpm *lpm, uint32_t ip, uint32_t *next_hop)
static void rte_lpm_lookupx4 (const struct rte_lpm *lpm, xmm_t ip, uint32_t hop[4], uint32_t defv)

Detailed Description

RTE Longest Prefix Match (LPM)

Definition in file rte_lpm.h.

Macro Definition Documentation

#define RTE_LPM_NAMESIZE 32

Max number of characters in LPM name.

Definition at line 28 of file rte_lpm.h.

#define RTE_LPM_MAX_DEPTH 32

Maximum depth value possible for IPv4 LPM.

Definition at line 31 of file rte_lpm.h.

#define RTE_LPM_LOOKUP_SUCCESS 0x01000000

Bitmask used to indicate successful lookup

Definition at line 62 of file rte_lpm.h.

#define rte_lpm_lookup_bulk(lpm, ips, next_hops, n) rte_lpm_lookup_bulk_func(lpm, ips, next_hops, n)

Lookup multiple IP addresses in an LPM table. This may be implemented as a macro, so the address of the function should not be used.

Parameters

lpm LPM object handle
ips Array of IPs to be looked up in the LPM table
next_hops Next hop of the most specific rule found for IP (valid on lookup hit only). This is an array of two byte values. The most significant byte in each value says whether the lookup was successful (bitmask RTE_LPM_LOOKUP_SUCCESS is set). The least significant byte is the actual next hop.
n Number of elements in ips (and next_hops) array to lookup. This should be a compile time constant, and divisible by 8 for best performance.

Returns

-EINVAL for incorrect arguments, otherwise 0

Definition at line 331 of file rte_lpm.h.

Enumeration Type Documentation

enum rte_lpm_qsbr_mode

RCU reclamation modes

Enumerator

Create defer queue for reclaim.
Use blocking mode reclaim. No defer queue created.

Definition at line 68 of file rte_lpm.h.

Function Documentation

struct rte_lpm* rte_lpm_create (const char * name, int socket_id, const struct rte_lpm_config * config)

Create an LPM object.

Parameters

name LPM object name
socket_id NUMA socket ID for LPM table memory allocation
config Structure containing the configuration

Returns

Handle to LPM object on success, NULL otherwise with rte_errno set to an appropriate values. Possible rte_errno values include:
  • E_RTE_NO_CONFIG - function could not get pointer to rte_config structure
  • E_RTE_SECONDARY - function was called from a secondary process instance
  • EINVAL - invalid parameter passed to function
  • ENOSPC - the maximum number of memzones has already been allocated
  • EEXIST - a memzone with the same name already exists
  • ENOMEM - no appropriate memory area found in which to create memzone

struct rte_lpm* rte_lpm_find_existing (const char * name)

Find an existing LPM object and return a pointer to it.

Parameters

name Name of the lpm object as passed to rte_lpm_create()

Returns

Pointer to lpm object or NULL if object not found with rte_errno set appropriately. Possible rte_errno values include:
•
ENOENT - required entry not available to return.

void rte_lpm_free (struct rte_lpm * lpm)

Free an LPM object.

Parameters

lpm LPM object handle If lpm is NULL, no operation is performed.

int rte_lpm_rcu_qsbr_add (struct rte_lpm * lpm, struct rte_lpm_rcu_config * cfg)

Associate RCU QSBR variable with an LPM object.

Parameters

lpm the lpm object to add RCU QSBR
cfg RCU QSBR configuration

Returns

On success - 0 On error - 1 with error code set in rte_errno. Possible rte_errno codes are:
  • EINVAL - invalid pointer
  • EEXIST - already added QSBR
  • ENOMEM - memory allocation failure

int rte_lpm_add (struct rte_lpm * lpm, uint32_t ip, uint8_t depth, uint32_t next_hop)

Add a rule to the LPM table.

Parameters

lpm LPM object handle
ip IP of the rule to be added to the LPM table
depth Depth of the rule to be added to the LPM table
next_hop Next hop of the rule to be added to the LPM table

Returns

0 on success, negative value otherwise

int rte_lpm_is_rule_present (struct rte_lpm * lpm, uint32_t ip, uint8_t depth, uint32_t * next_hop)

Check if a rule is present in the LPM table, and provide its next hop if it is.

Parameters

lpm LPM object handle
ip IP of the rule to be searched
depth Depth of the rule to searched
next_hop Next hop of the rule (valid only if it is found)

Returns

1 if the rule exists, 0 if it does not, a negative value on failure

int rte_lpm_delete (struct rte_lpm * lpm, uint32_t ip, uint8_t depth)

Delete a rule from the LPM table.

Parameters

lpm LPM object handle
ip IP of the rule to be deleted from the LPM table
depth Depth of the rule to be deleted from the LPM table

Returns

0 on success, negative value otherwise

void rte_lpm_delete_all (struct rte_lpm * lpm)

Delete all rules from the LPM table.

Parameters

lpm LPM object handle

static int rte_lpm_lookup (const struct rte_lpm * lpm, uint32_t ip, uint32_t * next_hop) [inline], [static]

Lookup an IP into the LPM table.

Parameters

lpm LPM object handle
ip IP to be looked up in the LPM table
next_hop Next hop of the most specific rule found for IP (valid on lookup hit only)

Returns

-EINVAL for incorrect arguments, -ENOENT on lookup miss, 0 on lookup hit

Definition at line 278 of file rte_lpm.h.

static void rte_lpm_lookupx4 (const struct rte_lpm * lpm, xmm_t ip, uint32_t hop[4], uint32_t defv) [inline], [static]

Lookup four IP addresses in an LPM table.

Parameters

lpm LPM object handle
ip Four IPs to be looked up in the LPM table
hop Next hop of the most specific rule found for IP (valid on lookup hit only). This is an 4 elements array of two byte values. If the lookup was successful for the given IP, then least significant byte of the corresponding element is the actual next hop and the most significant byte is zero. If the lookup for the given IP failed, then corresponding element would contain default value, see description of then next parameter.
defv Default value to populate into corresponding element of hop[] array, if lookup would fail.

Author

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Fri Dec 15 2023 Version 23.11.0