--- /dev/null
+/* SPDX-License-Identifier: BSD-3-Clause
+ * Copyright(c) 2018 Intel Corporation
+ */
+
+#include <stdarg.h>
+#include <stdio.h>
+#include <string.h>
+#include <errno.h>
+#include <stdint.h>
+#include <unistd.h>
+#include <inttypes.h>
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <sys/queue.h>
+
+#include <rte_common.h>
+#include <rte_byteorder.h>
+#include <rte_malloc.h>
+#include <rte_log.h>
+#include <rte_debug.h>
+#include <rte_cycles.h>
+#include <rte_eal.h>
+#include <rte_per_lcore.h>
+#include <rte_lcore.h>
+#include <rte_atomic.h>
+#include <rte_mbuf.h>
+#include <rte_ethdev.h>
+
+#include <rte_bpf_ethdev.h>
+#include "bpf_impl.h"
+
+/*
+ * information about installed BPF rx/tx callback
+ */
+
+struct bpf_eth_cbi {
+ /* used by both data & control path */
+ uint32_t use; /*usage counter */
+ const struct rte_eth_rxtx_callback *cb; /* callback handle */
+ struct rte_bpf *bpf;
+ struct rte_bpf_jit jit;
+ /* used by control path only */
+ LIST_ENTRY(bpf_eth_cbi) link;
+ uint16_t port;
+ uint16_t queue;
+} __rte_cache_aligned;
+
+/*
+ * Odd number means that callback is used by datapath.
+ * Even number means that callback is not used by datapath.
+ */
+#define BPF_ETH_CBI_INUSE 1
+
+/*
+ * List to manage RX/TX installed callbacks.
+ */
+LIST_HEAD(bpf_eth_cbi_list, bpf_eth_cbi);
+
+enum {
+ BPF_ETH_RX,
+ BPF_ETH_TX,
+ BPF_ETH_NUM,
+};
+
+/*
+ * information about all installed BPF rx/tx callbacks
+ */
+struct bpf_eth_cbh {
+ rte_spinlock_t lock;
+ struct bpf_eth_cbi_list list;
+ uint32_t type;
+};
+
+static struct bpf_eth_cbh rx_cbh = {
+ .lock = RTE_SPINLOCK_INITIALIZER,
+ .list = LIST_HEAD_INITIALIZER(list),
+ .type = BPF_ETH_RX,
+};
+
+static struct bpf_eth_cbh tx_cbh = {
+ .lock = RTE_SPINLOCK_INITIALIZER,
+ .list = LIST_HEAD_INITIALIZER(list),
+ .type = BPF_ETH_TX,
+};
+
+/*
+ * Marks given callback as used by datapath.
+ */
+static __rte_always_inline void
+bpf_eth_cbi_inuse(struct bpf_eth_cbi *cbi)
+{
+ cbi->use++;
+ /* make sure no store/load reordering could happen */
+ rte_smp_mb();
+}
+
+/*
+ * Marks given callback list as not used by datapath.
+ */
+static __rte_always_inline void
+bpf_eth_cbi_unuse(struct bpf_eth_cbi *cbi)
+{
+ /* make sure all previous loads are completed */
+ rte_smp_rmb();
+ cbi->use++;
+}
+
+/*
+ * Waits till datapath finished using given callback.
+ */
+static void
+bpf_eth_cbi_wait(const struct bpf_eth_cbi *cbi)
+{
+ uint32_t nuse, puse;
+
+ /* make sure all previous loads and stores are completed */
+ rte_smp_mb();
+
+ puse = cbi->use;
+
+ /* in use, busy wait till current RX/TX iteration is finished */
+ if ((puse & BPF_ETH_CBI_INUSE) != 0) {
+ do {
+ rte_pause();
+ rte_compiler_barrier();
+ nuse = cbi->use;
+ } while (nuse == puse);
+ }
+}
+
+static void
+bpf_eth_cbi_cleanup(struct bpf_eth_cbi *bc)
+{
+ bc->bpf = NULL;
+ memset(&bc->jit, 0, sizeof(bc->jit));
+}
+
+static struct bpf_eth_cbi *
+bpf_eth_cbh_find(struct bpf_eth_cbh *cbh, uint16_t port, uint16_t queue)
+{
+ struct bpf_eth_cbi *cbi;
+
+ LIST_FOREACH(cbi, &cbh->list, link) {
+ if (cbi->port == port && cbi->queue == queue)
+ break;
+ }
+ return cbi;
+}
+
+static struct bpf_eth_cbi *
+bpf_eth_cbh_add(struct bpf_eth_cbh *cbh, uint16_t port, uint16_t queue)
+{
+ struct bpf_eth_cbi *cbi;
+
+ /* return an existing one */
+ cbi = bpf_eth_cbh_find(cbh, port, queue);
+ if (cbi != NULL)
+ return cbi;
+
+ cbi = rte_zmalloc(NULL, sizeof(*cbi), RTE_CACHE_LINE_SIZE);
+ if (cbi != NULL) {
+ cbi->port = port;
+ cbi->queue = queue;
+ LIST_INSERT_HEAD(&cbh->list, cbi, link);
+ }
+ return cbi;
+}
+
+/*
+ * BPF packet processing routinies.
+ */
+
+static inline uint32_t
+apply_filter(struct rte_mbuf *mb[], const uint64_t rc[], uint32_t num,
+ uint32_t drop)
+{
+ uint32_t i, j, k;
+ struct rte_mbuf *dr[num];
+
+ for (i = 0, j = 0, k = 0; i != num; i++) {
+
+ /* filter matches */
+ if (rc[i] != 0)
+ mb[j++] = mb[i];
+ /* no match */
+ else
+ dr[k++] = mb[i];
+ }
+
+ if (drop != 0) {
+ /* free filtered out mbufs */
+ for (i = 0; i != k; i++)
+ rte_pktmbuf_free(dr[i]);
+ } else {
+ /* copy filtered out mbufs beyond good ones */
+ for (i = 0; i != k; i++)
+ mb[j + i] = dr[i];
+ }
+
+ return j;
+}
+
+static inline uint32_t
+pkt_filter_vm(const struct rte_bpf *bpf, struct rte_mbuf *mb[], uint32_t num,
+ uint32_t drop)
+{
+ uint32_t i;
+ void *dp[num];
+ uint64_t rc[num];
+
+ for (i = 0; i != num; i++)
+ dp[i] = rte_pktmbuf_mtod(mb[i], void *);
+
+ rte_bpf_exec_burst(bpf, dp, rc, num);
+ return apply_filter(mb, rc, num, drop);
+}
+
+static inline uint32_t
+pkt_filter_jit(const struct rte_bpf_jit *jit, struct rte_mbuf *mb[],
+ uint32_t num, uint32_t drop)
+{
+ uint32_t i, n;
+ void *dp;
+ uint64_t rc[num];
+
+ n = 0;
+ for (i = 0; i != num; i++) {
+ dp = rte_pktmbuf_mtod(mb[i], void *);
+ rc[i] = jit->func(dp);
+ n += (rc[i] == 0);
+ }
+
+ if (n != 0)
+ num = apply_filter(mb, rc, num, drop);
+
+ return num;
+}
+
+static inline uint32_t
+pkt_filter_mb_vm(const struct rte_bpf *bpf, struct rte_mbuf *mb[], uint32_t num,
+ uint32_t drop)
+{
+ uint64_t rc[num];
+
+ rte_bpf_exec_burst(bpf, (void **)mb, rc, num);
+ return apply_filter(mb, rc, num, drop);
+}
+
+static inline uint32_t
+pkt_filter_mb_jit(const struct rte_bpf_jit *jit, struct rte_mbuf *mb[],
+ uint32_t num, uint32_t drop)
+{
+ uint32_t i, n;
+ uint64_t rc[num];
+
+ n = 0;
+ for (i = 0; i != num; i++) {
+ rc[i] = jit->func(mb[i]);
+ n += (rc[i] == 0);
+ }
+
+ if (n != 0)
+ num = apply_filter(mb, rc, num, drop);
+
+ return num;
+}
+
+/*
+ * RX/TX callbacks for raw data bpf.
+ */
+
+static uint16_t
+bpf_rx_callback_vm(__rte_unused uint16_t port, __rte_unused uint16_t queue,
+ struct rte_mbuf *pkt[], uint16_t nb_pkts,
+ __rte_unused uint16_t max_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_vm(cbi->bpf, pkt, nb_pkts, 1) :
+ nb_pkts;
+ bpf_eth_cbi_unuse(cbi);
+ return rc;
+}
+
+static uint16_t
+bpf_rx_callback_jit(__rte_unused uint16_t port, __rte_unused uint16_t queue,
+ struct rte_mbuf *pkt[], uint16_t nb_pkts,
+ __rte_unused uint16_t max_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_jit(&cbi->jit, pkt, nb_pkts, 1) :
+ nb_pkts;
+ bpf_eth_cbi_unuse(cbi);
+ return rc;
+}
+
+static uint16_t
+bpf_tx_callback_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_vm(cbi->bpf, pkt, nb_pkts, 0) :
+ nb_pkts;
+ bpf_eth_cbi_unuse(cbi);
+ return rc;
+}
+
+static uint16_t
+bpf_tx_callback_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_jit(&cbi->jit, pkt, nb_pkts, 0) :
+ nb_pkts;
+ bpf_eth_cbi_unuse(cbi);
+ return rc;
+}
+
+/*
+ * RX/TX callbacks for mbuf.
+ */
+
+static uint16_t
+bpf_rx_callback_mb_vm(__rte_unused uint16_t port, __rte_unused uint16_t queue,
+ struct rte_mbuf *pkt[], uint16_t nb_pkts,
+ __rte_unused uint16_t max_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, 1) :
+ nb_pkts;
+ bpf_eth_cbi_unuse(cbi);
+ return rc;
+}
+
+static uint16_t
+bpf_rx_callback_mb_jit(__rte_unused uint16_t port, __rte_unused uint16_t queue,
+ struct rte_mbuf *pkt[], uint16_t nb_pkts,
+ __rte_unused uint16_t max_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, 1) :
+ nb_pkts;
+ 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;
+}
--- /dev/null
+/* SPDX-License-Identifier: BSD-3-Clause
+ * Copyright(c) 2018 Intel Corporation
+ */
+
+#ifndef _RTE_BPF_ETHDEV_H_
+#define _RTE_BPF_ETHDEV_H_
+
+/**
+ * @file
+ *
+ * API to install BPF filter as RX/TX callbacks for eth devices.
+ * Note that right now:
+ * - it is not MT safe, i.e. it is not allowed to do load/unload for the
+ * same port/queue from different threads in parallel.
+ * - though it allows to do load/unload at runtime
+ * (while RX/TX is ongoing on given port/queue).
+ * - allows only one BPF program per port/queue,
+ * i.e. new load will replace previously loaded for that port/queue BPF program.
+ * Filter behaviour - if BPF program returns zero value for a given packet,
+ * then it will be dropped inside callback and no further processing
+ * on RX - it will be dropped inside callback and no further processing
+ * for that packet will happen.
+ * on TX - packet will remain unsent, and it is responsibility of the user
+ * to handle such situation (drop, try to send again, etc.).
+ */
+
+#include <rte_bpf.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+enum {
+ RTE_BPF_ETH_F_NONE = 0,
+ RTE_BPF_ETH_F_JIT = 0x1, /*< use compiled into native ISA code */
+};
+
+/**
+ * Unload previously loaded BPF program (if any) from given RX port/queue
+ * and remove appropriate RX port/queue callback.
+ *
+ * @param port
+ * The identifier of the ethernet port
+ * @param queue
+ * The identifier of the RX queue on the given port
+ */
+void rte_bpf_eth_rx_unload(uint16_t port, uint16_t queue);
+
+/**
+ * Unload previously loaded BPF program (if any) from given TX port/queue
+ * and remove appropriate TX port/queue callback.
+ *
+ * @param port
+ * The identifier of the ethernet port
+ * @param queue
+ * The identifier of the TX queue on the given port
+ */
+void rte_bpf_eth_tx_unload(uint16_t port, uint16_t queue);
+
+/**
+ * Load BPF program from the ELF file and install callback to execute it
+ * on given RX port/queue.
+ *
+ * @param port
+ * The identifier of the ethernet port
+ * @param queue
+ * The identifier of the RX queue on the given port
+ * @param fname
+ * Pathname for a ELF file.
+ * @param sname
+ * Name of the executable section within the file to load.
+ * @param prm
+ * Parameters used to create and initialise the BPF exeution context.
+ * @param flags
+ * Flags that define expected expected behavior of the loaded filter
+ * (i.e. jited/non-jited version to use).
+ * @return
+ * Zero on successful completion or negative error code otherwise.
+ */
+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);
+
+/**
+ * Load BPF program from the ELF file and install callback to execute it
+ * on given TX port/queue.
+ *
+ * @param port
+ * The identifier of the ethernet port
+ * @param queue
+ * The identifier of the TX queue on the given port
+ * @param fname
+ * Pathname for a ELF file.
+ * @param sname
+ * Name of the executable section within the file to load.
+ * @param prm
+ * Parameters used to create and initialise the BPF exeution context.
+ * @param flags
+ * Flags that define expected expected behavior of the loaded filter
+ * (i.e. jited/non-jited version to use).
+ * @return
+ * Zero on successful completion or negative error code otherwise.
+ */
+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);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* _RTE_BPF_ETHDEV_H_ */
git.droids-corp.org / dpdk.git / commitdiff