606 lines
13 KiB
C
606 lines
13 KiB
C
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/* SPDX-License-Identifier: BSD-3-Clause
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* Copyright(c) 2018 Intel Corporation
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*/
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#include <stdarg.h>
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#include <stdio.h>
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#include <string.h>
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#include <errno.h>
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#include <stdint.h>
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#include <unistd.h>
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#include <inttypes.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <sys/queue.h>
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#include <rte_common.h>
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#include <rte_byteorder.h>
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#include <rte_malloc.h>
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#include <rte_log.h>
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#include <rte_debug.h>
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#include <rte_cycles.h>
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#include <rte_eal.h>
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#include <rte_per_lcore.h>
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#include <rte_lcore.h>
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#include <rte_atomic.h>
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#include <rte_mbuf.h>
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#include <rte_ethdev.h>
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#include <rte_bpf_ethdev.h>
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#include "bpf_impl.h"
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/*
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* information about installed BPF rx/tx callback
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*/
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struct bpf_eth_cbi {
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/* used by both data & control path */
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uint32_t use; /*usage counter */
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const struct rte_eth_rxtx_callback *cb; /* callback handle */
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struct rte_bpf *bpf;
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struct rte_bpf_jit jit;
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/* used by control path only */
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LIST_ENTRY(bpf_eth_cbi) link;
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uint16_t port;
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uint16_t queue;
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} __rte_cache_aligned;
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/*
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* Odd number means that callback is used by datapath.
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* Even number means that callback is not used by datapath.
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*/
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#define BPF_ETH_CBI_INUSE 1
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/*
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* List to manage RX/TX installed callbacks.
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*/
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LIST_HEAD(bpf_eth_cbi_list, bpf_eth_cbi);
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enum {
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BPF_ETH_RX,
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BPF_ETH_TX,
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BPF_ETH_NUM,
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};
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/*
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* information about all installed BPF rx/tx callbacks
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*/
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struct bpf_eth_cbh {
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rte_spinlock_t lock;
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struct bpf_eth_cbi_list list;
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uint32_t type;
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};
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static struct bpf_eth_cbh rx_cbh = {
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.lock = RTE_SPINLOCK_INITIALIZER,
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.list = LIST_HEAD_INITIALIZER(list),
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.type = BPF_ETH_RX,
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};
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static struct bpf_eth_cbh tx_cbh = {
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.lock = RTE_SPINLOCK_INITIALIZER,
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.list = LIST_HEAD_INITIALIZER(list),
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.type = BPF_ETH_TX,
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};
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/*
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* Marks given callback as used by datapath.
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*/
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static __rte_always_inline void
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bpf_eth_cbi_inuse(struct bpf_eth_cbi *cbi)
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{
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cbi->use++;
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/* make sure no store/load reordering could happen */
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rte_smp_mb();
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}
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/*
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* Marks given callback list as not used by datapath.
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*/
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static __rte_always_inline void
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bpf_eth_cbi_unuse(struct bpf_eth_cbi *cbi)
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{
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/* make sure all previous loads are completed */
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rte_smp_rmb();
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cbi->use++;
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}
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/*
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* Waits till datapath finished using given callback.
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*/
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static void
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bpf_eth_cbi_wait(const struct bpf_eth_cbi *cbi)
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{
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uint32_t nuse, puse;
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/* make sure all previous loads and stores are completed */
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rte_smp_mb();
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puse = cbi->use;
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/* in use, busy wait till current RX/TX iteration is finished */
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if ((puse & BPF_ETH_CBI_INUSE) != 0) {
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do {
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rte_pause();
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rte_compiler_barrier();
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nuse = cbi->use;
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} while (nuse == puse);
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}
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}
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static void
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bpf_eth_cbi_cleanup(struct bpf_eth_cbi *bc)
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{
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bc->bpf = NULL;
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memset(&bc->jit, 0, sizeof(bc->jit));
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}
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static struct bpf_eth_cbi *
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bpf_eth_cbh_find(struct bpf_eth_cbh *cbh, uint16_t port, uint16_t queue)
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{
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struct bpf_eth_cbi *cbi;
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LIST_FOREACH(cbi, &cbh->list, link) {
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if (cbi->port == port && cbi->queue == queue)
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break;
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}
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return cbi;
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}
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static struct bpf_eth_cbi *
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bpf_eth_cbh_add(struct bpf_eth_cbh *cbh, uint16_t port, uint16_t queue)
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{
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struct bpf_eth_cbi *cbi;
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/* return an existing one */
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cbi = bpf_eth_cbh_find(cbh, port, queue);
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if (cbi != NULL)
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return cbi;
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cbi = rte_zmalloc(NULL, sizeof(*cbi), RTE_CACHE_LINE_SIZE);
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if (cbi != NULL) {
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cbi->port = port;
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cbi->queue = queue;
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LIST_INSERT_HEAD(&cbh->list, cbi, link);
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}
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return cbi;
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}
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/*
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* BPF packet processing routinies.
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*/
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static inline uint32_t
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apply_filter(struct rte_mbuf *mb[], const uint64_t rc[], uint32_t num,
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uint32_t drop)
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{
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uint32_t i, j, k;
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struct rte_mbuf *dr[num];
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for (i = 0, j = 0, k = 0; i != num; i++) {
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/* filter matches */
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if (rc[i] != 0)
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mb[j++] = mb[i];
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/* no match */
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else
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dr[k++] = mb[i];
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}
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if (drop != 0) {
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/* free filtered out mbufs */
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for (i = 0; i != k; i++)
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rte_pktmbuf_free(dr[i]);
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} else {
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/* copy filtered out mbufs beyond good ones */
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for (i = 0; i != k; i++)
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mb[j + i] = dr[i];
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}
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return j;
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}
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static inline uint32_t
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pkt_filter_vm(const struct rte_bpf *bpf, struct rte_mbuf *mb[], uint32_t num,
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uint32_t drop)
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{
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uint32_t i;
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void *dp[num];
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uint64_t rc[num];
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for (i = 0; i != num; i++)
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dp[i] = rte_pktmbuf_mtod(mb[i], void *);
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rte_bpf_exec_burst(bpf, dp, rc, num);
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return apply_filter(mb, rc, num, drop);
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}
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static inline uint32_t
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pkt_filter_jit(const struct rte_bpf_jit *jit, struct rte_mbuf *mb[],
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uint32_t num, uint32_t drop)
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{
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uint32_t i, n;
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void *dp;
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uint64_t rc[num];
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n = 0;
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for (i = 0; i != num; i++) {
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dp = rte_pktmbuf_mtod(mb[i], void *);
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rc[i] = jit->func(dp);
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n += (rc[i] == 0);
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}
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if (n != 0)
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num = apply_filter(mb, rc, num, drop);
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return num;
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}
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static inline uint32_t
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pkt_filter_mb_vm(const struct rte_bpf *bpf, struct rte_mbuf *mb[], uint32_t num,
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uint32_t drop)
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{
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uint64_t rc[num];
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rte_bpf_exec_burst(bpf, (void **)mb, rc, num);
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return apply_filter(mb, rc, num, drop);
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}
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static inline uint32_t
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pkt_filter_mb_jit(const struct rte_bpf_jit *jit, struct rte_mbuf *mb[],
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uint32_t num, uint32_t drop)
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{
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uint32_t i, n;
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uint64_t rc[num];
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n = 0;
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for (i = 0; i != num; i++) {
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rc[i] = jit->func(mb[i]);
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n += (rc[i] == 0);
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}
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if (n != 0)
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num = apply_filter(mb, rc, num, drop);
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return num;
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}
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/*
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* RX/TX callbacks for raw data bpf.
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*/
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static uint16_t
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bpf_rx_callback_vm(__rte_unused uint16_t port, __rte_unused uint16_t queue,
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struct rte_mbuf *pkt[], uint16_t nb_pkts,
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__rte_unused uint16_t max_pkts, void *user_param)
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{
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struct bpf_eth_cbi *cbi;
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uint16_t rc;
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cbi = user_param;
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bpf_eth_cbi_inuse(cbi);
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rc = (cbi->cb != NULL) ?
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pkt_filter_vm(cbi->bpf, pkt, nb_pkts, 1) :
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nb_pkts;
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bpf_eth_cbi_unuse(cbi);
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return rc;
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}
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static uint16_t
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bpf_rx_callback_jit(__rte_unused uint16_t port, __rte_unused uint16_t queue,
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struct rte_mbuf *pkt[], uint16_t nb_pkts,
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__rte_unused uint16_t max_pkts, void *user_param)
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{
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struct bpf_eth_cbi *cbi;
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uint16_t rc;
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cbi = user_param;
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bpf_eth_cbi_inuse(cbi);
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rc = (cbi->cb != NULL) ?
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pkt_filter_jit(&cbi->jit, pkt, nb_pkts, 1) :
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nb_pkts;
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bpf_eth_cbi_unuse(cbi);
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return rc;
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}
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static uint16_t
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bpf_tx_callback_vm(__rte_unused uint16_t port, __rte_unused uint16_t queue,
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struct rte_mbuf *pkt[], uint16_t nb_pkts, void *user_param)
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{
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struct bpf_eth_cbi *cbi;
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uint16_t rc;
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cbi = user_param;
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bpf_eth_cbi_inuse(cbi);
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rc = (cbi->cb != NULL) ?
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pkt_filter_vm(cbi->bpf, pkt, nb_pkts, 0) :
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nb_pkts;
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bpf_eth_cbi_unuse(cbi);
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return rc;
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}
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static uint16_t
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bpf_tx_callback_jit(__rte_unused uint16_t port, __rte_unused uint16_t queue,
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struct rte_mbuf *pkt[], uint16_t nb_pkts, void *user_param)
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{
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struct bpf_eth_cbi *cbi;
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uint16_t rc;
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cbi = user_param;
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bpf_eth_cbi_inuse(cbi);
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rc = (cbi->cb != NULL) ?
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pkt_filter_jit(&cbi->jit, pkt, nb_pkts, 0) :
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nb_pkts;
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bpf_eth_cbi_unuse(cbi);
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return rc;
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}
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/*
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* RX/TX callbacks for mbuf.
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*/
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static uint16_t
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bpf_rx_callback_mb_vm(__rte_unused uint16_t port, __rte_unused uint16_t queue,
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struct rte_mbuf *pkt[], uint16_t nb_pkts,
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__rte_unused uint16_t max_pkts, void *user_param)
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{
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struct bpf_eth_cbi *cbi;
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uint16_t rc;
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cbi = user_param;
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bpf_eth_cbi_inuse(cbi);
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rc = (cbi->cb != NULL) ?
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pkt_filter_mb_vm(cbi->bpf, pkt, nb_pkts, 1) :
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nb_pkts;
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bpf_eth_cbi_unuse(cbi);
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return rc;
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}
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static uint16_t
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bpf_rx_callback_mb_jit(__rte_unused uint16_t port, __rte_unused uint16_t queue,
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struct rte_mbuf *pkt[], uint16_t nb_pkts,
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__rte_unused uint16_t max_pkts, void *user_param)
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{
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struct bpf_eth_cbi *cbi;
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uint16_t rc;
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cbi = user_param;
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bpf_eth_cbi_inuse(cbi);
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rc = (cbi->cb != NULL) ?
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pkt_filter_mb_jit(&cbi->jit, pkt, nb_pkts, 1) :
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nb_pkts;
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|
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bpf_eth_cbi_unuse(cbi);
|
||
|
|
return rc;
|
||
|
|
}
|
||
|
|
|
||
|
|
static uint16_t
|
||
|
|
bpf_tx_callback_mb_vm(__rte_unused uint16_t port, __rte_unused uint16_t queue,
|
||
|
|
struct rte_mbuf *pkt[], uint16_t nb_pkts, void *user_param)
|
||
|
|
{
|
||
|
|
struct bpf_eth_cbi *cbi;
|
||
|
|
uint16_t rc;
|
||
|
|
|
||
|
|
cbi = user_param;
|
||
|
|
bpf_eth_cbi_inuse(cbi);
|
||
|
|
rc = (cbi->cb != NULL) ?
|
||
|
|
pkt_filter_mb_vm(cbi->bpf, pkt, nb_pkts, 0) :
|
||
|
|
nb_pkts;
|
||
|
|
bpf_eth_cbi_unuse(cbi);
|
||
|
|
return rc;
|
||
|
|
}
|
||
|
|
|
||
|
|
static uint16_t
|
||
|
|
bpf_tx_callback_mb_jit(__rte_unused uint16_t port, __rte_unused uint16_t queue,
|
||
|
|
struct rte_mbuf *pkt[], uint16_t nb_pkts, void *user_param)
|
||
|
|
{
|
||
|
|
struct bpf_eth_cbi *cbi;
|
||
|
|
uint16_t rc;
|
||
|
|
|
||
|
|
cbi = user_param;
|
||
|
|
bpf_eth_cbi_inuse(cbi);
|
||
|
|
rc = (cbi->cb != NULL) ?
|
||
|
|
pkt_filter_mb_jit(&cbi->jit, pkt, nb_pkts, 0) :
|
||
|
|
nb_pkts;
|
||
|
|
bpf_eth_cbi_unuse(cbi);
|
||
|
|
return rc;
|
||
|
|
}
|
||
|
|
|
||
|
|
static rte_rx_callback_fn
|
||
|
|
select_rx_callback(enum rte_bpf_arg_type type, uint32_t flags)
|
||
|
|
{
|
||
|
|
if (flags & RTE_BPF_ETH_F_JIT) {
|
||
|
|
if (type == RTE_BPF_ARG_PTR)
|
||
|
|
return bpf_rx_callback_jit;
|
||
|
|
else if (type == RTE_BPF_ARG_PTR_MBUF)
|
||
|
|
return bpf_rx_callback_mb_jit;
|
||
|
|
} else if (type == RTE_BPF_ARG_PTR)
|
||
|
|
return bpf_rx_callback_vm;
|
||
|
|
else if (type == RTE_BPF_ARG_PTR_MBUF)
|
||
|
|
return bpf_rx_callback_mb_vm;
|
||
|
|
|
||
|
|
return NULL;
|
||
|
|
}
|
||
|
|
|
||
|
|
static rte_tx_callback_fn
|
||
|
|
select_tx_callback(enum rte_bpf_arg_type type, uint32_t flags)
|
||
|
|
{
|
||
|
|
if (flags & RTE_BPF_ETH_F_JIT) {
|
||
|
|
if (type == RTE_BPF_ARG_PTR)
|
||
|
|
return bpf_tx_callback_jit;
|
||
|
|
else if (type == RTE_BPF_ARG_PTR_MBUF)
|
||
|
|
return bpf_tx_callback_mb_jit;
|
||
|
|
} else if (type == RTE_BPF_ARG_PTR)
|
||
|
|
return bpf_tx_callback_vm;
|
||
|
|
else if (type == RTE_BPF_ARG_PTR_MBUF)
|
||
|
|
return bpf_tx_callback_mb_vm;
|
||
|
|
|
||
|
|
return NULL;
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
* helper function to perform BPF unload for given port/queue.
|
||
|
|
* have to introduce extra complexity (and possible slowdown) here,
|
||
|
|
* as right now there is no safe generic way to remove RX/TX callback
|
||
|
|
* while IO is active.
|
||
|
|
* Still don't free memory allocated for callback handle itself,
|
||
|
|
* again right now there is no safe way to do that without stopping RX/TX
|
||
|
|
* on given port/queue first.
|
||
|
|
*/
|
||
|
|
static void
|
||
|
|
bpf_eth_cbi_unload(struct bpf_eth_cbi *bc)
|
||
|
|
{
|
||
|
|
/* mark this cbi as empty */
|
||
|
|
bc->cb = NULL;
|
||
|
|
rte_smp_mb();
|
||
|
|
|
||
|
|
/* make sure datapath doesn't use bpf anymore, then destroy bpf */
|
||
|
|
bpf_eth_cbi_wait(bc);
|
||
|
|
rte_bpf_destroy(bc->bpf);
|
||
|
|
bpf_eth_cbi_cleanup(bc);
|
||
|
|
}
|
||
|
|
|
||
|
|
static void
|
||
|
|
bpf_eth_unload(struct bpf_eth_cbh *cbh, uint16_t port, uint16_t queue)
|
||
|
|
{
|
||
|
|
struct bpf_eth_cbi *bc;
|
||
|
|
|
||
|
|
bc = bpf_eth_cbh_find(cbh, port, queue);
|
||
|
|
if (bc == NULL || bc->cb == NULL)
|
||
|
|
return;
|
||
|
|
|
||
|
|
if (cbh->type == BPF_ETH_RX)
|
||
|
|
rte_eth_remove_rx_callback(port, queue, bc->cb);
|
||
|
|
else
|
||
|
|
rte_eth_remove_tx_callback(port, queue, bc->cb);
|
||
|
|
|
||
|
|
bpf_eth_cbi_unload(bc);
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
__rte_experimental void
|
||
|
|
rte_bpf_eth_rx_unload(uint16_t port, uint16_t queue)
|
||
|
|
{
|
||
|
|
struct bpf_eth_cbh *cbh;
|
||
|
|
|
||
|
|
cbh = &rx_cbh;
|
||
|
|
rte_spinlock_lock(&cbh->lock);
|
||
|
|
bpf_eth_unload(cbh, port, queue);
|
||
|
|
rte_spinlock_unlock(&cbh->lock);
|
||
|
|
}
|
||
|
|
|
||
|
|
__rte_experimental void
|
||
|
|
rte_bpf_eth_tx_unload(uint16_t port, uint16_t queue)
|
||
|
|
{
|
||
|
|
struct bpf_eth_cbh *cbh;
|
||
|
|
|
||
|
|
cbh = &tx_cbh;
|
||
|
|
rte_spinlock_lock(&cbh->lock);
|
||
|
|
bpf_eth_unload(cbh, port, queue);
|
||
|
|
rte_spinlock_unlock(&cbh->lock);
|
||
|
|
}
|
||
|
|
|
||
|
|
static int
|
||
|
|
bpf_eth_elf_load(struct bpf_eth_cbh *cbh, uint16_t port, uint16_t queue,
|
||
|
|
const struct rte_bpf_prm *prm, const char *fname, const char *sname,
|
||
|
|
uint32_t flags)
|
||
|
|
{
|
||
|
|
int32_t rc;
|
||
|
|
struct bpf_eth_cbi *bc;
|
||
|
|
struct rte_bpf *bpf;
|
||
|
|
rte_rx_callback_fn frx;
|
||
|
|
rte_tx_callback_fn ftx;
|
||
|
|
struct rte_bpf_jit jit;
|
||
|
|
|
||
|
|
frx = NULL;
|
||
|
|
ftx = NULL;
|
||
|
|
|
||
|
|
if (prm == NULL || rte_eth_dev_is_valid_port(port) == 0 ||
|
||
|
|
queue >= RTE_MAX_QUEUES_PER_PORT)
|
||
|
|
return -EINVAL;
|
||
|
|
|
||
|
|
if (cbh->type == BPF_ETH_RX)
|
||
|
|
frx = select_rx_callback(prm->prog_arg.type, flags);
|
||
|
|
else
|
||
|
|
ftx = select_tx_callback(prm->prog_arg.type, flags);
|
||
|
|
|
||
|
|
if (frx == NULL && ftx == NULL) {
|
||
|
|
RTE_BPF_LOG(ERR, "%s(%u, %u): no callback selected;\n",
|
||
|
|
__func__, port, queue);
|
||
|
|
return -EINVAL;
|
||
|
|
}
|
||
|
|
|
||
|
|
bpf = rte_bpf_elf_load(prm, fname, sname);
|
||
|
|
if (bpf == NULL)
|
||
|
|
return -rte_errno;
|
||
|
|
|
||
|
|
rte_bpf_get_jit(bpf, &jit);
|
||
|
|
|
||
|
|
if ((flags & RTE_BPF_ETH_F_JIT) != 0 && jit.func == NULL) {
|
||
|
|
RTE_BPF_LOG(ERR, "%s(%u, %u): no JIT generated;\n",
|
||
|
|
__func__, port, queue);
|
||
|
|
rte_bpf_destroy(bpf);
|
||
|
|
return -ENOTSUP;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* setup/update global callback info */
|
||
|
|
bc = bpf_eth_cbh_add(cbh, port, queue);
|
||
|
|
if (bc == NULL)
|
||
|
|
return -ENOMEM;
|
||
|
|
|
||
|
|
/* remove old one, if any */
|
||
|
|
if (bc->cb != NULL)
|
||
|
|
bpf_eth_unload(cbh, port, queue);
|
||
|
|
|
||
|
|
bc->bpf = bpf;
|
||
|
|
bc->jit = jit;
|
||
|
|
|
||
|
|
if (cbh->type == BPF_ETH_RX)
|
||
|
|
bc->cb = rte_eth_add_rx_callback(port, queue, frx, bc);
|
||
|
|
else
|
||
|
|
bc->cb = rte_eth_add_tx_callback(port, queue, ftx, bc);
|
||
|
|
|
||
|
|
if (bc->cb == NULL) {
|
||
|
|
rc = -rte_errno;
|
||
|
|
rte_bpf_destroy(bpf);
|
||
|
|
bpf_eth_cbi_cleanup(bc);
|
||
|
|
} else
|
||
|
|
rc = 0;
|
||
|
|
|
||
|
|
return rc;
|
||
|
|
}
|
||
|
|
|
||
|
|
__rte_experimental int
|
||
|
|
rte_bpf_eth_rx_elf_load(uint16_t port, uint16_t queue,
|
||
|
|
const struct rte_bpf_prm *prm, const char *fname, const char *sname,
|
||
|
|
uint32_t flags)
|
||
|
|
{
|
||
|
|
int32_t rc;
|
||
|
|
struct bpf_eth_cbh *cbh;
|
||
|
|
|
||
|
|
cbh = &rx_cbh;
|
||
|
|
rte_spinlock_lock(&cbh->lock);
|
||
|
|
rc = bpf_eth_elf_load(cbh, port, queue, prm, fname, sname, flags);
|
||
|
|
rte_spinlock_unlock(&cbh->lock);
|
||
|
|
|
||
|
|
return rc;
|
||
|
|
}
|
||
|
|
|
||
|
|
__rte_experimental int
|
||
|
|
rte_bpf_eth_tx_elf_load(uint16_t port, uint16_t queue,
|
||
|
|
const struct rte_bpf_prm *prm, const char *fname, const char *sname,
|
||
|
|
uint32_t flags)
|
||
|
|
{
|
||
|
|
int32_t rc;
|
||
|
|
struct bpf_eth_cbh *cbh;
|
||
|
|
|
||
|
|
cbh = &tx_cbh;
|
||
|
|
rte_spinlock_lock(&cbh->lock);
|
||
|
|
rc = bpf_eth_elf_load(cbh, port, queue, prm, fname, sname, flags);
|
||
|
|
rte_spinlock_unlock(&cbh->lock);
|
||
|
|
|
||
|
|
return rc;
|
||
|
|
}
|