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[204.195.123.141]) by smtp.gmail.com with ESMTPSA id w70-20020a638249000000b005d5445349edsm2166075pgd.19.2024.02.07.14.16.28 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 07 Feb 2024 14:16:28 -0800 (PST) From: Stephen Hemminger To: dev@dpdk.org Cc: Stephen Hemminger Subject: [PATCH v2 5/7] net/tap: use libbpf to load new BPF program Date: Wed, 7 Feb 2024 14:11:23 -0800 Message-ID: <20240207221623.195157-6-stephen@networkplumber.org> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20240207221623.195157-1-stephen@networkplumber.org> References: <20240130034925.44869-1-stephen@networkplumber.org> <20240207221623.195157-1-stephen@networkplumber.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-BeenThere: dev@dpdk.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: DPDK patches and discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dev-bounces@dpdk.org There were multiple issues in the RSS queue support in the TAP driver. This required extensive rework of the BPF support. Change the BPF loading to use bpftool to create a skeleton header file, and load with libbpf. The BPF is always compiled from source so less chance that source and instructions diverge. Also resolves issue where libbpf and source get out of sync. The program is only loaded once, so if multiple rules are created only one BPF program is loaded in kernel. The new BPF program only needs a single action. No need for action and re-classification step. It alsow fixes the missing bits from the original. - supports setting RSS key per flow - level of hash can be L3 or L3/L4. Signed-off-by: Stephen Hemminger --- drivers/net/tap/meson.build | 26 +-- drivers/net/tap/rte_eth_tap.c | 2 + drivers/net/tap/rte_eth_tap.h | 9 +- drivers/net/tap/tap_flow.c | 391 +++++++++------------------------ drivers/net/tap/tap_flow.h | 11 +- drivers/net/tap/tap_rss.h | 3 + drivers/net/tap/tap_rss.stub.h | 45 ++++ drivers/net/tap/tap_tcmsgs.h | 4 +- 8 files changed, 163 insertions(+), 328 deletions(-) create mode 100644 drivers/net/tap/tap_rss.stub.h diff --git a/drivers/net/tap/meson.build b/drivers/net/tap/meson.build index 5099ccdff11b..ad51b6bbbb7c 100644 --- a/drivers/net/tap/meson.build +++ b/drivers/net/tap/meson.build @@ -7,33 +7,21 @@ if not is_linux endif sources = files( 'rte_eth_tap.c', - 'tap_bpf_api.c', 'tap_flow.c', 'tap_intr.c', 'tap_netlink.c', 'tap_tcmsgs.c', ) +subdir('bpf') +if enable_tap_rss + cflags += '-DHAVE_BPF_RSS' + ext_deps += libbpf + sources += tap_rss_skel_h +endif + deps = ['bus_vdev', 'gso', 'hash'] cflags += '-DTAP_MAX_QUEUES=16' -# input array for meson symbol search: -# [ "MACRO to define if found", "header for the search", -# "enum/define", "symbol to search" ] -# -args = [ - [ 'HAVE_TC_FLOWER', 'linux/pkt_cls.h', 'TCA_FLOWER_UNSPEC' ], - [ 'HAVE_TC_VLAN_ID', 'linux/pkt_cls.h', 'TCA_FLOWER_KEY_VLAN_PRIO' ], - [ 'HAVE_TC_BPF', 'linux/pkt_cls.h', 'TCA_BPF_UNSPEC' ], - [ 'HAVE_TC_BPF_FD', 'linux/pkt_cls.h', 'TCA_BPF_FD' ], - [ 'HAVE_TC_ACT_BPF', 'linux/tc_act/tc_bpf.h', 'TCA_ACT_BPF_UNSPEC' ], - [ 'HAVE_TC_ACT_BPF_FD', 'linux/tc_act/tc_bpf.h', 'TCA_ACT_BPF_FD' ], -] -config = configuration_data() -foreach arg:args - config.set(arg[0], cc.has_header_symbol(arg[1], arg[2])) -endforeach -configure_file(output : 'tap_autoconf.h', configuration : config) - require_iova_in_mbuf = false diff --git a/drivers/net/tap/rte_eth_tap.c b/drivers/net/tap/rte_eth_tap.c index b41fa971cb7e..a98cc8f01ae1 100644 --- a/drivers/net/tap/rte_eth_tap.c +++ b/drivers/net/tap/rte_eth_tap.c @@ -1138,6 +1138,7 @@ tap_dev_close(struct rte_eth_dev *dev) tap_flow_implicit_flush(internals, NULL); tap_nl_final(internals->nlsk_fd); internals->nlsk_fd = -1; + tap_flow_bpf_destroy(internals); } for (i = 0; i < RTE_PMD_TAP_MAX_QUEUES; i++) { @@ -1959,6 +1960,7 @@ eth_dev_tap_create(struct rte_vdev_device *vdev, const char *tap_name, strlcpy(pmd->name, tap_name, sizeof(pmd->name)); pmd->type = type; pmd->ka_fd = -1; + pmd->rss = NULL; pmd->nlsk_fd = -1; pmd->gso_ctx_mp = NULL; diff --git a/drivers/net/tap/rte_eth_tap.h b/drivers/net/tap/rte_eth_tap.h index 5ac93f93e961..0cf2b30bb03b 100644 --- a/drivers/net/tap/rte_eth_tap.h +++ b/drivers/net/tap/rte_eth_tap.h @@ -79,12 +79,11 @@ struct pmd_internals { int flow_isolate; /* 1 if flow isolation is enabled */ int flower_support; /* 1 if kernel supports, else 0 */ int flower_vlan_support; /* 1 if kernel supports, else 0 */ - int rss_enabled; /* 1 if RSS is enabled, else 0 */ int persist; /* 1 if keep link up, else 0 */ - /* implicit rules set when RSS is enabled */ - int map_fd; /* BPF RSS map fd */ - int bpf_fd[RTE_PMD_TAP_MAX_QUEUES];/* List of bpf fds per queue */ - LIST_HEAD(tap_rss_flows, rte_flow) rss_flows; + + struct tap_rss *rss; /* BPF program */ + uint16_t bpf_flowid; /* next BPF class id */ + LIST_HEAD(tap_flows, rte_flow) flows; /* rte_flow rules */ /* implicit rte_flow rules set when a remote device is active */ LIST_HEAD(tap_implicit_flows, rte_flow) implicit_flows; diff --git a/drivers/net/tap/tap_flow.c b/drivers/net/tap/tap_flow.c index 94436af55ce8..ef34e85c423b 100644 --- a/drivers/net/tap/tap_flow.c +++ b/drivers/net/tap/tap_flow.c @@ -16,24 +16,19 @@ #include #include -#include #include #include - -/* RSS key management */ -enum bpf_rss_key_e { - KEY_CMD_GET = 1, - KEY_CMD_RELEASE, - KEY_CMD_INIT, - KEY_CMD_DEINIT, -}; - -enum key_status_e { - KEY_STAT_UNSPEC, - KEY_STAT_USED, - KEY_STAT_AVAILABLE, -}; +#pragma GCC diagnostic push +#ifdef HAVE_BPF_RSS +/* Workaround for warning in bpftool generated skeleton code */ +#pragma GCC diagnostic ignored "-Wcast-qual" +#include "tap_rss.skel.h" +#else +#pragma GCC diagnostic ignored "-Wunused-parameter" +#include "tap_rss.stub.h" +#endif +#pragma GCC diagnostic pop #define ISOLATE_HANDLE 1 #define REMOTE_PROMISCUOUS_HANDLE 2 @@ -41,8 +36,7 @@ enum key_status_e { struct rte_flow { LIST_ENTRY(rte_flow) next; /* Pointer to the next rte_flow structure */ struct rte_flow *remote_flow; /* associated remote flow */ - int bpf_fd[SEC_MAX]; /* list of bfs fds per ELF section */ - uint32_t key_idx; /* RSS rule key index into BPF map */ + uint16_t flowid; struct nlmsg msg; }; @@ -72,7 +66,7 @@ struct action_data { } skbedit; struct bpf { struct tc_act_bpf bpf; - int bpf_fd; + uint16_t classid; const char *annotation; } bpf; }; @@ -112,10 +106,7 @@ tap_flow_isolate(struct rte_eth_dev *dev, int set, struct rte_flow_error *error); -static int bpf_rss_key(enum bpf_rss_key_e cmd, __u32 *key_idx); -static int rss_enable(struct pmd_internals *pmd, - const struct rte_flow_attr *attr, - struct rte_flow_error *error); +static int rss_enable(struct pmd_internals *pmd, struct rte_flow_error *error); static int rss_add_actions(struct rte_flow *flow, struct pmd_internals *pmd, const struct rte_flow_action_rss *rss, struct rte_flow_error *error); @@ -829,7 +820,8 @@ tap_flow_item_validate(const struct rte_flow_item *item, * -1 on failure, 0 on success */ static int -add_action(struct rte_flow *flow, size_t *act_index, struct action_data *adata) +add_action(struct rte_flow *flow, struct pmd_internals *pmd, + size_t *act_index, struct action_data *adata) { struct nlmsg *msg = &flow->msg; @@ -858,13 +850,18 @@ add_action(struct rte_flow *flow, size_t *act_index, struct action_data *adata) tap_nlattr_add16(&msg->nh, TCA_SKBEDIT_QUEUE_MAPPING, adata->skbedit.queue); } else if (strcmp("bpf", adata->id) == 0) { - tap_nlattr_add32(&msg->nh, TCA_ACT_BPF_FD, adata->bpf.bpf_fd); + struct bpf_program *rss_prog = pmd->rss->progs.rss_flow_action; + + tap_nlattr_add32(&msg->nh, TCA_ACT_BPF_FD, bpf_program__fd(rss_prog)); tap_nlattr_add(&msg->nh, TCA_ACT_BPF_NAME, strlen(adata->bpf.annotation) + 1, adata->bpf.annotation); tap_nlattr_add(&msg->nh, TCA_ACT_BPF_PARMS, sizeof(adata->bpf.bpf), &adata->bpf.bpf); + tap_nlattr_add(&msg->nh, TCA_BPF_CLASSID, + sizeof(adata->bpf.classid), + &adata->bpf.classid); } else { return -1; } @@ -892,7 +889,8 @@ add_action(struct rte_flow *flow, size_t *act_index, struct action_data *adata) * -1 on failure, 0 on success */ static int -add_actions(struct rte_flow *flow, int nb_actions, struct action_data *data, +add_actions(struct rte_flow *flow, struct pmd_internals *pmd, + int nb_actions, struct action_data *data, int classifier_action) { struct nlmsg *msg = &flow->msg; @@ -902,7 +900,7 @@ add_actions(struct rte_flow *flow, int nb_actions, struct action_data *data, if (tap_nlattr_nested_start(msg, classifier_action) < 0) return -1; for (i = 0; i < nb_actions; i++) - if (add_action(flow, &act_index, data + i) < 0) + if (add_action(flow, pmd, &act_index, data + i) < 0) return -1; tap_nlattr_nested_finish(msg); /* nested TCA_FLOWER_ACT */ return 0; @@ -1062,7 +1060,7 @@ priv_flow_process(struct pmd_internals *pmd, adata.mirred.action = TC_ACT_PIPE; else adata.mirred.action = TC_ACT_STOLEN; - if (add_actions(flow, 1, &adata, TCA_FLOWER_ACT) < 0) + if (add_actions(flow, pmd, 1, &adata, TCA_FLOWER_ACT) < 0) goto exit_action_not_supported; else goto end; @@ -1085,7 +1083,7 @@ priv_flow_process(struct pmd_internals *pmd, }, }; - err = add_actions(flow, 1, &adata, + err = add_actions(flow, pmd, 1, &adata, TCA_FLOWER_ACT); } } else if (actions->type == RTE_FLOW_ACTION_TYPE_PASSTHRU) { @@ -1101,7 +1099,7 @@ priv_flow_process(struct pmd_internals *pmd, }, }; - err = add_actions(flow, 1, &adata, + err = add_actions(flow, pmd, 1, &adata, TCA_FLOWER_ACT); } } else if (actions->type == RTE_FLOW_ACTION_TYPE_QUEUE) { @@ -1126,8 +1124,8 @@ priv_flow_process(struct pmd_internals *pmd, }, }; - err = add_actions(flow, 1, &adata, - TCA_FLOWER_ACT); + err = add_actions(flow, pmd, 1, &adata, + TCA_FLOWER_ACT); } } else if (actions->type == RTE_FLOW_ACTION_TYPE_RSS) { const struct rte_flow_action_rss *rss = @@ -1137,8 +1135,8 @@ priv_flow_process(struct pmd_internals *pmd, if (action++) goto exit_action_not_supported; - if (!pmd->rss_enabled) { - err = rss_enable(pmd, attr, error); + if (pmd->rss == NULL) { + err = rss_enable(pmd, error); if (err) goto exit_action_not_supported; } @@ -1241,23 +1239,14 @@ tap_flow_set_handle(struct rte_flow *flow) static void tap_flow_free(struct pmd_internals *pmd, struct rte_flow *flow) { - int i; + struct tap_rss *rss = pmd->rss; if (!flow) return; - if (pmd->rss_enabled) { - /* Close flow BPF file descriptors */ - for (i = 0; i < SEC_MAX; i++) - if (flow->bpf_fd[i] != 0) { - close(flow->bpf_fd[i]); - flow->bpf_fd[i] = 0; - } - - /* Release the map key for this RSS rule */ - bpf_rss_key(KEY_CMD_RELEASE, &flow->key_idx); - flow->key_idx = 0; - } + if (rss) + bpf_map__delete_elem(rss->maps.rss_map, &flow->flowid, + sizeof(flow->flowid), 0); /* Free flow allocated memory */ rte_free(flow); @@ -1725,13 +1714,16 @@ tap_flow_implicit_flush(struct pmd_internals *pmd, struct rte_flow_error *error) return 0; } -#define MAX_RSS_KEYS 256 -#define KEY_IDX_OFFSET (3 * MAX_RSS_KEYS) -#define SEC_NAME_CLS_Q "cls_q" - -static const char *sec_name[SEC_MAX] = { - [SEC_L3_L4] = "l3_l4", -}; +/** + * Cleanup when device is closed + */ +void tap_flow_bpf_destroy(struct pmd_internals *pmd) +{ + if (pmd->rss == NULL) + return; + tap_rss__destroy(pmd->rss); + pmd->rss = NULL; +} /** * Enable RSS on tap: create TC rules for queuing. @@ -1747,226 +1739,62 @@ static const char *sec_name[SEC_MAX] = { * * @return 0 on success, negative value on failure. */ -static int rss_enable(struct pmd_internals *pmd, - const struct rte_flow_attr *attr, - struct rte_flow_error *error) +static int rss_enable(struct pmd_internals *pmd, struct rte_flow_error *error) { - struct rte_flow *rss_flow = NULL; - struct nlmsg *msg = NULL; - /* 4096 is the maximum number of instructions for a BPF program */ - char annotation[64]; - int i; - int err = 0; - - /* unlimit locked memory */ - struct rlimit memlock_limit = { - .rlim_cur = RLIM_INFINITY, - .rlim_max = RLIM_INFINITY, - }; - setrlimit(RLIMIT_MEMLOCK, &memlock_limit); - - /* Get a new map key for a new RSS rule */ - err = bpf_rss_key(KEY_CMD_INIT, NULL); - if (err < 0) { - rte_flow_error_set( - error, EINVAL, RTE_FLOW_ERROR_TYPE_HANDLE, NULL, - "Failed to initialize BPF RSS keys"); - - return -1; - } - - /* - * Create BPF RSS MAP - */ - pmd->map_fd = tap_flow_bpf_rss_map_create(sizeof(__u32), /* key size */ - sizeof(struct rss_key), - MAX_RSS_KEYS); - if (pmd->map_fd < 0) { - TAP_LOG(ERR, - "Failed to create BPF map (%d): %s", - errno, strerror(errno)); - rte_flow_error_set( - error, ENOTSUP, RTE_FLOW_ERROR_TYPE_HANDLE, NULL, - "Kernel too old or not configured " - "to support BPF maps"); + int err; - return -ENOTSUP; + /* Load the BPF program (defined in tap_bpf.h from skeleton) */ + pmd->rss = tap_rss__open_and_load(); + if (pmd->rss == NULL) { + TAP_LOG(ERR, "Failed to load BPF object: %s", strerror(errno)); + rte_flow_error_set(error, errno, RTE_FLOW_ERROR_TYPE_HANDLE, NULL, + "BPF object could not be loaded"); + return -errno; } - /* - * Add a rule per queue to match reclassified packets and direct them to - * the correct queue. - */ - for (i = 0; i < pmd->dev->data->nb_rx_queues; i++) { - pmd->bpf_fd[i] = tap_flow_bpf_cls_q(i); - if (pmd->bpf_fd[i] < 0) { - TAP_LOG(ERR, - "Failed to load BPF section %s for queue %d", - SEC_NAME_CLS_Q, i); - rte_flow_error_set( - error, ENOTSUP, RTE_FLOW_ERROR_TYPE_HANDLE, - NULL, - "Kernel too old or not configured " - "to support BPF programs loading"); - - return -ENOTSUP; - } - - rss_flow = rte_zmalloc(__func__, sizeof(struct rte_flow), 0); - if (!rss_flow) { - TAP_LOG(ERR, - "Cannot allocate memory for rte_flow"); - return -1; - } - msg = &rss_flow->msg; - tc_init_msg(msg, pmd->if_index, RTM_NEWTFILTER, NLM_F_REQUEST | - NLM_F_ACK | NLM_F_EXCL | NLM_F_CREATE); - msg->t.tcm_info = TC_H_MAKE(0, htons(ETH_P_ALL)); - tap_flow_set_handle(rss_flow); - uint16_t group = attr->group << GROUP_SHIFT; - uint16_t prio = group | (i + PRIORITY_OFFSET); - msg->t.tcm_info = TC_H_MAKE(prio << 16, msg->t.tcm_info); - msg->t.tcm_parent = TC_H_MAKE(MULTIQ_MAJOR_HANDLE, 0); - - tap_nlattr_add(&msg->nh, TCA_KIND, sizeof("bpf"), "bpf"); - if (tap_nlattr_nested_start(msg, TCA_OPTIONS) < 0) - return -1; - tap_nlattr_add32(&msg->nh, TCA_BPF_FD, pmd->bpf_fd[i]); - snprintf(annotation, sizeof(annotation), "[%s%d]", - SEC_NAME_CLS_Q, i); - tap_nlattr_add(&msg->nh, TCA_BPF_NAME, strlen(annotation) + 1, - annotation); - /* Actions */ - { - struct action_data adata = { - .id = "skbedit", - .skbedit = { - .skbedit = { - .action = TC_ACT_PIPE, - }, - .queue = i, - }, - }; - if (add_actions(rss_flow, 1, &adata, TCA_BPF_ACT) < 0) - return -1; - } - tap_nlattr_nested_finish(msg); /* nested TCA_OPTIONS */ - - /* Netlink message is now ready to be sent */ - if (tap_nl_send(pmd->nlsk_fd, &msg->nh) < 0) - return -1; - err = tap_nl_recv_ack(pmd->nlsk_fd); - if (err < 0) { - TAP_LOG(ERR, - "Kernel refused TC filter rule creation (%d): %s", - errno, strerror(errno)); - return err; - } - LIST_INSERT_HEAD(&pmd->rss_flows, rss_flow, next); + /* Attach the maps defined in BPF program */ + err = tap_rss__attach(pmd->rss); + if (err < 0) { + TAP_LOG(ERR, "Failed to attach BPF object: %d", err); + rte_flow_error_set(error, -err, RTE_FLOW_ERROR_TYPE_HANDLE, NULL, + "BPF object could not be attached"); + tap_flow_bpf_destroy(pmd); + return err; } - pmd->rss_enabled = 1; - return err; + return 0; } -/** - * Manage bpf RSS keys repository with operations: init, get, release - * - * @param[in] cmd - * Command on RSS keys: init, get, release - * - * @param[in, out] key_idx - * Pointer to RSS Key index (out for get command, in for release command) - * - * @return -1 if couldn't get, release or init the RSS keys, 0 otherwise. - */ -static int bpf_rss_key(enum bpf_rss_key_e cmd, __u32 *key_idx) -{ - __u32 i; - int err = 0; - static __u32 num_used_keys; - static __u32 rss_keys[MAX_RSS_KEYS] = {KEY_STAT_UNSPEC}; - static __u32 rss_keys_initialized; - __u32 key; - - switch (cmd) { - case KEY_CMD_GET: - if (!rss_keys_initialized) { - err = -1; - break; - } - - if (num_used_keys == RTE_DIM(rss_keys)) { - err = -1; - break; - } - - *key_idx = num_used_keys % RTE_DIM(rss_keys); - while (rss_keys[*key_idx] == KEY_STAT_USED) - *key_idx = (*key_idx + 1) % RTE_DIM(rss_keys); - - rss_keys[*key_idx] = KEY_STAT_USED; - - /* - * Add an offset to key_idx in order to handle a case of - * RSS and non RSS flows mixture. - * If a non RSS flow is destroyed it has an eBPF map - * index 0 (initialized on flow creation) and might - * unintentionally remove RSS entry 0 from eBPF map. - * To avoid this issue, add an offset to the real index - * during a KEY_CMD_GET operation and subtract this offset - * during a KEY_CMD_RELEASE operation in order to restore - * the real index. - */ - *key_idx += KEY_IDX_OFFSET; - num_used_keys++; - break; - - case KEY_CMD_RELEASE: - if (!rss_keys_initialized) - break; - - /* - * Subtract offset to restore real key index - * If a non RSS flow is falsely trying to release map - * entry 0 - the offset subtraction will calculate the real - * map index as an out-of-range value and the release operation - * will be silently ignored. - */ - key = *key_idx - KEY_IDX_OFFSET; - if (key >= RTE_DIM(rss_keys)) - break; - if (rss_keys[key] == KEY_STAT_USED) { - rss_keys[key] = KEY_STAT_AVAILABLE; - num_used_keys--; - } - break; - - case KEY_CMD_INIT: - for (i = 0; i < RTE_DIM(rss_keys); i++) - rss_keys[i] = KEY_STAT_AVAILABLE; +/* Choose next flow id to use for BPF action */ +static int tap_rss_flow_assign(struct pmd_internals *pmd, uint16_t *flow_id) +{ + struct rte_flow *flow; + uint16_t id; - rss_keys_initialized = 1; - num_used_keys = 0; - break; + id = pmd->bpf_flowid; - case KEY_CMD_DEINIT: - for (i = 0; i < RTE_DIM(rss_keys); i++) - rss_keys[i] = KEY_STAT_UNSPEC; +next_id: + /* Skip 0xffff and 0 as id's */ + if (++id == UINT16_MAX) + id = 1; - rss_keys_initialized = 0; - num_used_keys = 0; - break; + /* Wrapped around, all id's have been used */ + if (id == pmd->bpf_flowid) + return -1; - default: - break; + /* Make sure this id has not been used already */ + for (flow = LIST_FIRST(&pmd->flows); flow; flow = LIST_NEXT(flow, next)) { + if (flow->flowid == id) + goto next_id; } - return err; + /* Record starting point for next time */ + pmd->bpf_flowid = id; + *flow_id = id; + return 0; } - /* Default RSS hash key also used by mlx devices */ static const uint8_t rss_hash_default_key[] = { 0x2c, 0xc6, 0x81, 0xd1, @@ -2050,34 +1878,34 @@ static int rss_add_actions(struct rte_flow *flow, struct pmd_internals *pmd, else if (rss->types & (RTE_ETH_RSS_IPV6 | RTE_ETH_RSS_FRAG_IPV6 | RTE_ETH_RSS_IPV6_EX)) hash_type |= RTE_BIT32(HASH_FIELD_IPV6_L3); - /* Get a new map key for a new RSS rule */ - err = bpf_rss_key(KEY_CMD_GET, &flow->key_idx); + + /* Choose new flow id, which is used as index into the BPF map */ + err = tap_rss_flow_assign(pmd, &flow->flowid); if (err < 0) { rte_flow_error_set( error, EINVAL, RTE_FLOW_ERROR_TYPE_HANDLE, NULL, - "Failed to get BPF RSS key"); + "Failed to get BPF flowid"); return -1; } - /* Update RSS map entry with queues */ - rss_entry.nb_queues = rss->queue_num; - for (i = 0; i < rss->queue_num; i++) - rss_entry.queues[i] = rss->queue[i]; - rss_entry.hash_fields = hash_type; rte_convert_rss_key((const uint32_t *)key_in, (uint32_t *)rss_entry.key, TAP_RSS_HASH_KEY_SIZE); + /* Update RSS map entry with queues */ + rss_entry.nb_queues = rss->queue_num; + for (i = 0; i < rss->queue_num; i++) + rss_entry.queues[i] = rss->queue[i]; /* Add this RSS entry to map */ - err = tap_flow_bpf_update_rss_elem(pmd->map_fd, - &flow->key_idx, &rss_entry); - + err = bpf_map__update_elem(pmd->rss->maps.rss_map, + &flow->flowid, sizeof(uint16_t), + &rss_entry, sizeof(rss_entry), 0); if (err) { TAP_LOG(ERR, "Failed to update BPF map entry #%u (%d): %s", - flow->key_idx, errno, strerror(errno)); + flow->flowid, errno, strerror(errno)); rte_flow_error_set( error, ENOTSUP, RTE_FLOW_ERROR_TYPE_HANDLE, NULL, "Kernel too old or not configured " @@ -2086,33 +1914,14 @@ static int rss_add_actions(struct rte_flow *flow, struct pmd_internals *pmd, return -ENOTSUP; } - - /* - * Load bpf rules to calculate hash for this key_idx - */ - - flow->bpf_fd[SEC_L3_L4] = - tap_flow_bpf_calc_l3_l4_hash(flow->key_idx, pmd->map_fd); - if (flow->bpf_fd[SEC_L3_L4] < 0) { - TAP_LOG(ERR, - "Failed to load BPF section %s (%d): %s", - sec_name[SEC_L3_L4], errno, strerror(errno)); - rte_flow_error_set( - error, ENOTSUP, RTE_FLOW_ERROR_TYPE_HANDLE, NULL, - "Kernel too old or not configured " - "to support BPF program loading"); - - return -ENOTSUP; - } - /* Actions */ { struct action_data adata[] = { { .id = "bpf", .bpf = { - .bpf_fd = flow->bpf_fd[SEC_L3_L4], - .annotation = sec_name[SEC_L3_L4], + .annotation = "tap_rss", + .classid = flow->flowid, .bpf = { .action = TC_ACT_PIPE, }, @@ -2120,8 +1929,8 @@ static int rss_add_actions(struct rte_flow *flow, struct pmd_internals *pmd, }, }; - if (add_actions(flow, RTE_DIM(adata), adata, - TCA_FLOWER_ACT) < 0) + if (add_actions(flow, pmd, RTE_DIM(adata), adata, + TCA_FLOWER_ACT) < 0) return -1; } diff --git a/drivers/net/tap/tap_flow.h b/drivers/net/tap/tap_flow.h index 240fbc3dfaef..41f9833619a1 100644 --- a/drivers/net/tap/tap_flow.h +++ b/drivers/net/tap/tap_flow.h @@ -9,7 +9,6 @@ #include #include #include -#include /** * In TC, priority 0 means we require the kernel to allocate one for us. @@ -41,10 +40,6 @@ enum implicit_rule_index { TAP_REMOTE_MAX_IDX, }; -enum bpf_fd_idx { - SEC_L3_L4, - SEC_MAX, -}; int tap_dev_flow_ops_get(struct rte_eth_dev *dev, const struct rte_flow_ops **ops); @@ -57,10 +52,6 @@ int tap_flow_implicit_destroy(struct pmd_internals *pmd, int tap_flow_implicit_flush(struct pmd_internals *pmd, struct rte_flow_error *error); -int tap_flow_bpf_cls_q(__u32 queue_idx); -int tap_flow_bpf_calc_l3_l4_hash(__u32 key_idx, int map_fd); -int tap_flow_bpf_rss_map_create(unsigned int key_size, unsigned int value_size, - unsigned int max_entries); -int tap_flow_bpf_update_rss_elem(int fd, void *key, void *value); +void tap_flow_bpf_destroy(struct pmd_internals *pmd); #endif /* _TAP_FLOW_H_ */ diff --git a/drivers/net/tap/tap_rss.h b/drivers/net/tap/tap_rss.h index 6009be7031b0..51b7ff0d007e 100644 --- a/drivers/net/tap/tap_rss.h +++ b/drivers/net/tap/tap_rss.h @@ -9,6 +9,9 @@ #define TAP_MAX_QUEUES 16 #endif +/* Size of the map from BPF classid to queue table */ +#define TAP_RSS_MAX TAP_MAX_QUEUES + /* Fixed RSS hash key size in bytes. */ #define TAP_RSS_HASH_KEY_SIZE 40 diff --git a/drivers/net/tap/tap_rss.stub.h b/drivers/net/tap/tap_rss.stub.h new file mode 100644 index 000000000000..10a1692e1e15 --- /dev/null +++ b/drivers/net/tap/tap_rss.stub.h @@ -0,0 +1,45 @@ +/* SPDX-License-Identifier: BSD-3-Clause + * Stub if libbpf is not available + */ + +struct bpf_object; +struct bpf_map; + +struct tap_rss { + struct bpf_object *obj; + struct { + struct bpf_map *rss_map; + } maps; +}; + +static struct tap_rss *tap_rss__open_and_load(void) +{ + errno = ENOTSUP; + return NULL; +} + +static void tap_rss__destroy(struct tap_rss *obj) +{ +} + +static int tap_rss__attach(struct tap_rss *obj) +{ + return -1; +} + +static int bpf_object__btf_fd(struct bpf_object *obj) +{ + return -1; +} + +static int bpf_map__update_elem(const struct bpf_map *map, const void *key, size_t key_size, + const void *value, size_t value_size, int flags) +{ + return -1; +} + +static int bpf_map__delete_elem(const struct bpf_map *map, + const void *key, size_t key_size, int flags) +{ + return -1; +} diff --git a/drivers/net/tap/tap_tcmsgs.h b/drivers/net/tap/tap_tcmsgs.h index a64cb29d6fa8..00a0f22e3108 100644 --- a/drivers/net/tap/tap_tcmsgs.h +++ b/drivers/net/tap/tap_tcmsgs.h @@ -6,7 +6,6 @@ #ifndef _TAP_TCMSGS_H_ #define _TAP_TCMSGS_H_ -#include #include #include #include @@ -14,9 +13,8 @@ #include #include #include -#ifdef HAVE_TC_ACT_BPF #include -#endif + #include #include -- 2.43.0