// SPDX-License-Identifier: GPL-2.0 /* Copyright (C) 2018-2020, Intel Corporation. */ #include "ice.h" /** * ice_is_arfs_active - helper to check is aRFS is active * @vsi: VSI to check */ static bool ice_is_arfs_active(struct ice_vsi *vsi) { return !!vsi->arfs_fltr_list; } /** * ice_is_arfs_using_perfect_flow - check if aRFS has active perfect filters * @hw: pointer to the HW structure * @flow_type: flow type as Flow Director understands it * * Flow Director will query this function to see if aRFS is currently using * the specified flow_type for perfect (4-tuple) filters. */ bool ice_is_arfs_using_perfect_flow(struct ice_hw *hw, enum ice_fltr_ptype flow_type) { struct ice_arfs_active_fltr_cntrs *arfs_fltr_cntrs; struct ice_pf *pf = hw->back; struct ice_vsi *vsi; vsi = ice_get_main_vsi(pf); if (!vsi) return false; arfs_fltr_cntrs = vsi->arfs_fltr_cntrs; /* active counters can be updated by multiple CPUs */ smp_mb__before_atomic(); switch (flow_type) { case ICE_FLTR_PTYPE_NONF_IPV4_UDP: return atomic_read(&arfs_fltr_cntrs->active_udpv4_cnt) > 0; case ICE_FLTR_PTYPE_NONF_IPV6_UDP: return atomic_read(&arfs_fltr_cntrs->active_udpv6_cnt) > 0; case ICE_FLTR_PTYPE_NONF_IPV4_TCP: return atomic_read(&arfs_fltr_cntrs->active_tcpv4_cnt) > 0; case ICE_FLTR_PTYPE_NONF_IPV6_TCP: return atomic_read(&arfs_fltr_cntrs->active_tcpv6_cnt) > 0; default: return false; } } /** * ice_arfs_update_active_fltr_cntrs - update active filter counters for aRFS * @vsi: VSI that aRFS is active on * @entry: aRFS entry used to change counters * @add: true to increment counter, false to decrement */ static void ice_arfs_update_active_fltr_cntrs(struct ice_vsi *vsi, struct ice_arfs_entry *entry, bool add) { struct ice_arfs_active_fltr_cntrs *fltr_cntrs = vsi->arfs_fltr_cntrs; switch (entry->fltr_info.flow_type) { case ICE_FLTR_PTYPE_NONF_IPV4_TCP: if (add) atomic_inc(&fltr_cntrs->active_tcpv4_cnt); else atomic_dec(&fltr_cntrs->active_tcpv4_cnt); break; case ICE_FLTR_PTYPE_NONF_IPV6_TCP: if (add) atomic_inc(&fltr_cntrs->active_tcpv6_cnt); else atomic_dec(&fltr_cntrs->active_tcpv6_cnt); break; case ICE_FLTR_PTYPE_NONF_IPV4_UDP: if (add) atomic_inc(&fltr_cntrs->active_udpv4_cnt); else atomic_dec(&fltr_cntrs->active_udpv4_cnt); break; case ICE_FLTR_PTYPE_NONF_IPV6_UDP: if (add) atomic_inc(&fltr_cntrs->active_udpv6_cnt); else atomic_dec(&fltr_cntrs->active_udpv6_cnt); break; default: dev_err(ice_pf_to_dev(vsi->back), "aRFS: Failed to update filter counters, invalid filter type %d\n", entry->fltr_info.flow_type); } } /** * ice_arfs_del_flow_rules - delete the rules passed in from HW * @vsi: VSI for the flow rules that need to be deleted * @del_list_head: head of the list of ice_arfs_entry(s) for rule deletion * * Loop through the delete list passed in and remove the rules from HW. After * each rule is deleted, disconnect and free the ice_arfs_entry because it is no * longer being referenced by the aRFS hash table. */ static void ice_arfs_del_flow_rules(struct ice_vsi *vsi, struct hlist_head *del_list_head) { struct ice_arfs_entry *e; struct hlist_node *n; struct device *dev; dev = ice_pf_to_dev(vsi->back); hlist_for_each_entry_safe(e, n, del_list_head, list_entry) { int result; result = ice_fdir_write_fltr(vsi->back, &e->fltr_info, false, false); if (!result) ice_arfs_update_active_fltr_cntrs(vsi, e, false); else dev_dbg(dev, "Unable to delete aRFS entry, err %d fltr_state %d fltr_id %d flow_id %d Q %d\n", result, e->fltr_state, e->fltr_info.fltr_id, e->flow_id, e->fltr_info.q_index); /* The aRFS hash table is no longer referencing this entry */ hlist_del(&e->list_entry); devm_kfree(dev, e); } } /** * ice_arfs_add_flow_rules - add the rules passed in from HW * @vsi: VSI for the flow rules that need to be added * @add_list_head: head of the list of ice_arfs_entry_ptr(s) for rule addition * * Loop through the add list passed in and remove the rules from HW. After each * rule is added, disconnect and free the ice_arfs_entry_ptr node. Don't free * the ice_arfs_entry(s) because they are still being referenced in the aRFS * hash table. */ static void ice_arfs_add_flow_rules(struct ice_vsi *vsi, struct hlist_head *add_list_head) { struct ice_arfs_entry_ptr *ep; struct hlist_node *n; struct device *dev; dev = ice_pf_to_dev(vsi->back); hlist_for_each_entry_safe(ep, n, add_list_head, list_entry) { int result; result = ice_fdir_write_fltr(vsi->back, &ep->arfs_entry->fltr_info, true, false); if (!result) ice_arfs_update_active_fltr_cntrs(vsi, ep->arfs_entry, true); else dev_dbg(dev, "Unable to add aRFS entry, err %d fltr_state %d fltr_id %d flow_id %d Q %d\n", result, ep->arfs_entry->fltr_state, ep->arfs_entry->fltr_info.fltr_id, ep->arfs_entry->flow_id, ep->arfs_entry->fltr_info.q_index); hlist_del(&ep->list_entry); devm_kfree(dev, ep); } } /** * ice_arfs_is_flow_expired - check if the aRFS entry has expired * @vsi: VSI containing the aRFS entry * @arfs_entry: aRFS entry that's being checked for expiration * * Return true if the flow has expired, else false. This function should be used * to determine whether or not an aRFS entry should be removed from the hardware * and software structures. */ static bool ice_arfs_is_flow_expired(struct ice_vsi *vsi, struct ice_arfs_entry *arfs_entry) { #define ICE_ARFS_TIME_DELTA_EXPIRATION msecs_to_jiffies(5000) if (rps_may_expire_flow(vsi->netdev, arfs_entry->fltr_info.q_index, arfs_entry->flow_id, arfs_entry->fltr_info.fltr_id)) return true; /* expiration timer only used for UDP filters */ if (arfs_entry->fltr_info.flow_type != ICE_FLTR_PTYPE_NONF_IPV4_UDP && arfs_entry->fltr_info.flow_type != ICE_FLTR_PTYPE_NONF_IPV6_UDP) return false; return time_in_range64(arfs_entry->time_activated + ICE_ARFS_TIME_DELTA_EXPIRATION, arfs_entry->time_activated, get_jiffies_64()); } /** * ice_arfs_update_flow_rules - add/delete aRFS rules in HW * @vsi: the VSI to be forwarded to * @idx: index into the table of aRFS filter lists. Obtained from skb->hash * @add_list: list to populate with filters to be added to Flow Director * @del_list: list to populate with filters to be deleted from Flow Director * * Iterate over the hlist at the index given in the aRFS hash table and * determine if there are any aRFS entries that need to be either added or * deleted in the HW. If the aRFS entry is marked as ICE_ARFS_INACTIVE the * filter needs to be added to HW, else if it's marked as ICE_ARFS_ACTIVE and * the flow has expired delete the filter from HW. The caller of this function * is expected to add/delete rules on the add_list/del_list respectively. */ static void ice_arfs_update_flow_rules(struct ice_vsi *vsi, u16 idx, struct hlist_head *add_list, struct hlist_head *del_list) { struct ice_arfs_entry *e; struct hlist_node *n; struct device *dev; dev = ice_pf_to_dev(vsi->back); /* go through the aRFS hlist at this idx and check for needed updates */ hlist_for_each_entry_safe(e, n, &vsi->arfs_fltr_list[idx], list_entry) /* check if filter needs to be added to HW */ if (e->fltr_state == ICE_ARFS_INACTIVE) { enum ice_fltr_ptype flow_type = e->fltr_info.flow_type; struct ice_arfs_entry_ptr *ep = devm_kzalloc(dev, sizeof(*ep), GFP_ATOMIC); if (!ep) continue; INIT_HLIST_NODE(&ep->list_entry); /* reference aRFS entry to add HW filter */ ep->arfs_entry = e; hlist_add_head(&ep->list_entry, add_list); e->fltr_state = ICE_ARFS_ACTIVE; /* expiration timer only used for UDP flows */ if (flow_type == ICE_FLTR_PTYPE_NONF_IPV4_UDP || flow_type == ICE_FLTR_PTYPE_NONF_IPV6_UDP) e->time_activated = get_jiffies_64(); } else if (e->fltr_state == ICE_ARFS_ACTIVE) { /* check if filter needs to be removed from HW */ if (ice_arfs_is_flow_expired(vsi, e)) { /* remove aRFS entry from hash table for delete * and to prevent referencing it the next time * through this hlist index */ hlist_del(&e->list_entry); e->fltr_state = ICE_ARFS_TODEL; /* save reference to aRFS entry for delete */ hlist_add_head(&e->list_entry, del_list); } } } /** * ice_sync_arfs_fltrs - update all aRFS filters * @pf: board private structure */ void ice_sync_arfs_fltrs(struct ice_pf *pf) { HLIST_HEAD(tmp_del_list); HLIST_HEAD(tmp_add_list); struct ice_vsi *pf_vsi; unsigned int i; pf_vsi = ice_get_main_vsi(pf); if (!pf_vsi) return; if (!ice_is_arfs_active(pf_vsi)) return; spin_lock_bh(&pf_vsi->arfs_lock); /* Once we process aRFS for the PF VSI get out */ for (i = 0; i < ICE_MAX_ARFS_LIST; i++) ice_arfs_update_flow_rules(pf_vsi, i, &tmp_add_list, &tmp_del_list); spin_unlock_bh(&pf_vsi->arfs_lock); /* use list of ice_arfs_entry(s) for delete */ ice_arfs_del_flow_rules(pf_vsi, &tmp_del_list); /* use list of ice_arfs_entry_ptr(s) for add */ ice_arfs_add_flow_rules(pf_vsi, &tmp_add_list); } /** * ice_arfs_build_entry - builds an aRFS entry based on input * @vsi: destination VSI for this flow * @fk: flow dissector keys for creating the tuple * @rxq_idx: Rx queue to steer this flow to * @flow_id: passed down from the stack and saved for flow expiration * * returns an aRFS entry on success and NULL on failure */ static struct ice_arfs_entry * ice_arfs_build_entry(struct ice_vsi *vsi, const struct flow_keys *fk, u16 rxq_idx, u32 flow_id) { struct ice_arfs_entry *arfs_entry; struct ice_fdir_fltr *fltr_info; u8 ip_proto; arfs_entry = devm_kzalloc(ice_pf_to_dev(vsi->back), sizeof(*arfs_entry), GFP_ATOMIC | __GFP_NOWARN); if (!arfs_entry) return NULL; fltr_info = &arfs_entry->fltr_info; fltr_info->q_index = rxq_idx; fltr_info->dest_ctl = ICE_FLTR_PRGM_DESC_DEST_DIRECT_PKT_QINDEX; fltr_info->dest_vsi = vsi->idx; ip_proto = fk->basic.ip_proto; if (fk->basic.n_proto == htons(ETH_P_IP)) { fltr_info->ip.v4.proto = ip_proto; fltr_info->flow_type = (ip_proto == IPPROTO_TCP) ? ICE_FLTR_PTYPE_NONF_IPV4_TCP : ICE_FLTR_PTYPE_NONF_IPV4_UDP; fltr_info->ip.v4.src_ip = fk->addrs.v4addrs.src; fltr_info->ip.v4.dst_ip = fk->addrs.v4addrs.dst; fltr_info->ip.v4.src_port = fk->ports.src; fltr_info->ip.v4.dst_port = fk->ports.dst; } else { /* ETH_P_IPV6 */ fltr_info->ip.v6.proto = ip_proto; fltr_info->flow_type = (ip_proto == IPPROTO_TCP) ? ICE_FLTR_PTYPE_NONF_IPV6_TCP : ICE_FLTR_PTYPE_NONF_IPV6_UDP; memcpy(&fltr_info->ip.v6.src_ip, &fk->addrs.v6addrs.src, sizeof(struct in6_addr)); memcpy(&fltr_info->ip.v6.dst_ip, &fk->addrs.v6addrs.dst, sizeof(struct in6_addr)); fltr_info->ip.v6.src_port = fk->ports.src; fltr_info->ip.v6.dst_port = fk->ports.dst; } arfs_entry->flow_id = flow_id; fltr_info->fltr_id = atomic_inc_return(vsi->arfs_last_fltr_id) % RPS_NO_FILTER; return arfs_entry; } /** * ice_arfs_is_perfect_flow_set - Check to see if perfect flow is set * @hw: pointer to HW structure * @l3_proto: ETH_P_IP or ETH_P_IPV6 in network order * @l4_proto: IPPROTO_UDP or IPPROTO_TCP * * We only support perfect (4-tuple) filters for aRFS. This function allows aRFS * to check if perfect (4-tuple) flow rules are currently in place by Flow * Director. */ static bool ice_arfs_is_perfect_flow_set(struct ice_hw *hw, __be16 l3_proto, u8 l4_proto) { unsigned long *perfect_fltr = hw->fdir_perfect_fltr; /* advanced Flow Director disabled, perfect filters always supported */ if (!perfect_fltr) return true; if (l3_proto == htons(ETH_P_IP) && l4_proto == IPPROTO_UDP) return test_bit(ICE_FLTR_PTYPE_NONF_IPV4_UDP, perfect_fltr); else if (l3_proto == htons(ETH_P_IP) && l4_proto == IPPROTO_TCP) return test_bit(ICE_FLTR_PTYPE_NONF_IPV4_TCP, perfect_fltr); else if (l3_proto == htons(ETH_P_IPV6) && l4_proto == IPPROTO_UDP) return test_bit(ICE_FLTR_PTYPE_NONF_IPV6_UDP, perfect_fltr); else if (l3_proto == htons(ETH_P_IPV6) && l4_proto == IPPROTO_TCP) return test_bit(ICE_FLTR_PTYPE_NONF_IPV6_TCP, perfect_fltr); return false; } /** * ice_rx_flow_steer - steer the Rx flow to where application is being run * @netdev: ptr to the netdev being adjusted * @skb: buffer with required header information * @rxq_idx: queue to which the flow needs to move * @flow_id: flow identifier provided by the netdev * * Based on the skb, rxq_idx, and flow_id passed in add/update an entry in the * aRFS hash table. Iterate over one of the hlists in the aRFS hash table and * if the flow_id already exists in the hash table but the rxq_idx has changed * mark the entry as ICE_ARFS_INACTIVE so it can get updated in HW, else * if the entry is marked as ICE_ARFS_TODEL delete it from the aRFS hash table. * If neither of the previous conditions are true then add a new entry in the * aRFS hash table, which gets set to ICE_ARFS_INACTIVE by default so it can be * added to HW. */ int ice_rx_flow_steer(struct net_device *netdev, const struct sk_buff *skb, u16 rxq_idx, u32 flow_id) { struct ice_netdev_priv *np = netdev_priv(netdev); struct ice_arfs_entry *arfs_entry; struct ice_vsi *vsi = np->vsi; struct flow_keys fk; struct ice_pf *pf; __be16 n_proto; u8 ip_proto; u16 idx; int ret; /* failed to allocate memory for aRFS so don't crash */ if (unlikely(!vsi->arfs_fltr_list)) return -ENODEV; pf = vsi->back; if (skb->encapsulation) return -EPROTONOSUPPORT; if (!skb_flow_dissect_flow_keys(skb, &fk, 0)) return -EPROTONOSUPPORT; n_proto = fk.basic.n_proto; /* Support only IPV4 and IPV6 */ if ((n_proto == htons(ETH_P_IP) && !ip_is_fragment(ip_hdr(skb))) || n_proto == htons(ETH_P_IPV6)) ip_proto = fk.basic.ip_proto; else return -EPROTONOSUPPORT; /* Support only TCP and UDP */ if (ip_proto != IPPROTO_TCP && ip_proto != IPPROTO_UDP) return -EPROTONOSUPPORT; /* only support 4-tuple filters for aRFS */ if (!ice_arfs_is_perfect_flow_set(&pf->hw, n_proto, ip_proto)) return -EOPNOTSUPP; /* choose the aRFS list bucket based on skb hash */ idx = skb_get_hash_raw(skb) & ICE_ARFS_LST_MASK; /* search for entry in the bucket */ spin_lock_bh(&vsi->arfs_lock); hlist_for_each_entry(arfs_entry, &vsi->arfs_fltr_list[idx], list_entry) { struct ice_fdir_fltr *fltr_info; /* keep searching for the already existing arfs_entry flow */ if (arfs_entry->flow_id != flow_id) continue; fltr_info = &arfs_entry->fltr_info; ret = fltr_info->fltr_id; if (fltr_info->q_index == rxq_idx || arfs_entry->fltr_state != ICE_ARFS_ACTIVE) goto out; /* update the queue to forward to on an already existing flow */ fltr_info->q_index = rxq_idx; arfs_entry->fltr_state = ICE_ARFS_INACTIVE; ice_arfs_update_active_fltr_cntrs(vsi, arfs_entry, false); goto out_schedule_service_task; } arfs_entry = ice_arfs_build_entry(vsi, &fk, rxq_idx, flow_id); if (!arfs_entry) { ret = -ENOMEM; goto out; } ret = arfs_entry->fltr_info.fltr_id; INIT_HLIST_NODE(&arfs_entry->list_entry); hlist_add_head(&arfs_entry->list_entry, &vsi->arfs_fltr_list[idx]); out_schedule_service_task: ice_service_task_schedule(pf); out: spin_unlock_bh(&vsi->arfs_lock); return ret; } /** * ice_init_arfs_cntrs - initialize aRFS counter values * @vsi: VSI that aRFS counters need to be initialized on */ static int ice_init_arfs_cntrs(struct ice_vsi *vsi) { if (!vsi || vsi->type != ICE_VSI_PF) return -EINVAL; vsi->arfs_fltr_cntrs = kzalloc(sizeof(*vsi->arfs_fltr_cntrs), GFP_KERNEL); if (!vsi->arfs_fltr_cntrs) return -ENOMEM; vsi->arfs_last_fltr_id = kzalloc(sizeof(*vsi->arfs_last_fltr_id), GFP_KERNEL); if (!vsi->arfs_last_fltr_id) { kfree(vsi->arfs_fltr_cntrs); vsi->arfs_fltr_cntrs = NULL; return -ENOMEM; } return 0; } /** * ice_init_arfs - initialize aRFS resources * @vsi: the VSI to be forwarded to */ void ice_init_arfs(struct ice_vsi *vsi) { struct hlist_head *arfs_fltr_list; unsigned int i; if (!vsi || vsi->type != ICE_VSI_PF) return; arfs_fltr_list = kcalloc(ICE_MAX_ARFS_LIST, sizeof(*arfs_fltr_list), GFP_KERNEL); if (!arfs_fltr_list) return; if (ice_init_arfs_cntrs(vsi)) goto free_arfs_fltr_list; for (i = 0; i < ICE_MAX_ARFS_LIST; i++) INIT_HLIST_HEAD(&arfs_fltr_list[i]); spin_lock_init(&vsi->arfs_lock); vsi->arfs_fltr_list = arfs_fltr_list; return; free_arfs_fltr_list: kfree(arfs_fltr_list); } /** * ice_clear_arfs - clear the aRFS hash table and any memory used for aRFS * @vsi: the VSI to be forwarded to */ void ice_clear_arfs(struct ice_vsi *vsi) { struct device *dev; unsigned int i; if (!vsi || vsi->type != ICE_VSI_PF || !vsi->back || !vsi->arfs_fltr_list) return; dev = ice_pf_to_dev(vsi->back); for (i = 0; i < ICE_MAX_ARFS_LIST; i++) { struct ice_arfs_entry *r; struct hlist_node *n; spin_lock_bh(&vsi->arfs_lock); hlist_for_each_entry_safe(r, n, &vsi->arfs_fltr_list[i], list_entry) { hlist_del(&r->list_entry); devm_kfree(dev, r); } spin_unlock_bh(&vsi->arfs_lock); } kfree(vsi->arfs_fltr_list); vsi->arfs_fltr_list = NULL; kfree(vsi->arfs_last_fltr_id); vsi->arfs_last_fltr_id = NULL; kfree(vsi->arfs_fltr_cntrs); vsi->arfs_fltr_cntrs = NULL; } /** * ice_free_cpu_rx_rmap - free setup CPU reverse map * @vsi: the VSI to be forwarded to */ void ice_free_cpu_rx_rmap(struct ice_vsi *vsi) { struct net_device *netdev; if (!vsi || vsi->type != ICE_VSI_PF || !vsi->arfs_fltr_list) return; netdev = vsi->netdev; if (!netdev || !netdev->rx_cpu_rmap) return; free_irq_cpu_rmap(netdev->rx_cpu_rmap); netdev->rx_cpu_rmap = NULL; } /** * ice_set_cpu_rx_rmap - setup CPU reverse map for each queue * @vsi: the VSI to be forwarded to */ int ice_set_cpu_rx_rmap(struct ice_vsi *vsi) { struct net_device *netdev; struct ice_pf *pf; int base_idx, i; if (!vsi || vsi->type != ICE_VSI_PF) return -EINVAL; pf = vsi->back; netdev = vsi->netdev; if (!pf || !netdev || !vsi->num_q_vectors) return -EINVAL; netdev_dbg(netdev, "Setup CPU RMAP: vsi type 0x%x, ifname %s, q_vectors %d\n", vsi->type, netdev->name, vsi->num_q_vectors); netdev->rx_cpu_rmap = alloc_irq_cpu_rmap(vsi->num_q_vectors); if (unlikely(!netdev->rx_cpu_rmap)) return -EINVAL; base_idx = vsi->base_vector; for (i = 0; i < vsi->num_q_vectors; i++) if (irq_cpu_rmap_add(netdev->rx_cpu_rmap, pf->msix_entries[base_idx + i].vector)) { ice_free_cpu_rx_rmap(vsi); return -EINVAL; } return 0; } /** * ice_remove_arfs - remove/clear all aRFS resources * @pf: device private structure */ void ice_remove_arfs(struct ice_pf *pf) { struct ice_vsi *pf_vsi; pf_vsi = ice_get_main_vsi(pf); if (!pf_vsi) return; ice_free_cpu_rx_rmap(pf_vsi); ice_clear_arfs(pf_vsi); } /** * ice_rebuild_arfs - remove/clear all aRFS resources and rebuild after reset * @pf: device private structure */ void ice_rebuild_arfs(struct ice_pf *pf) { struct ice_vsi *pf_vsi; pf_vsi = ice_get_main_vsi(pf); if (!pf_vsi) return; ice_remove_arfs(pf); if (ice_set_cpu_rx_rmap(pf_vsi)) { dev_err(ice_pf_to_dev(pf), "Failed to rebuild aRFS\n"); return; } ice_init_arfs(pf_vsi); }