LXR linux/drivers/net/ethernet/cisco/enic/enic

   1// SPDX-License-Identifier: GPL-2.0
   2#include <linux/if.h>
   3#include <linux/if_ether.h>
   4#include <linux/if_link.h>
   5#include <linux/netdevice.h>
   6#include <linux/in.h>
   7#include <linux/types.h>
   8#include <linux/skbuff.h>
   9#include <net/flow_dissector.h>
  10#include "enic_res.h"
  11#include "enic_clsf.h"
  12
  13/* enic_addfltr_5t - Add ipv4 5tuple filter
  14 *      @enic: enic struct of vnic
  15 *      @keys: flow_keys of ipv4 5tuple
  16 *      @rq: rq number to steer to
  17 *
  18 * This function returns filter_id(hardware_id) of the filter
  19 * added. In case of error it returns a negative number.
  20 */
  21int enic_addfltr_5t(struct enic *enic, struct flow_keys *keys, u16 rq)
  22{
  23        int res;
  24        struct filter data;
  25
  26        switch (keys->basic.ip_proto) {
  27        case IPPROTO_TCP:
  28                data.u.ipv4.protocol = PROTO_TCP;
  29                break;
  30        case IPPROTO_UDP:
  31                data.u.ipv4.protocol = PROTO_UDP;
  32                break;
  33        default:
  34                return -EPROTONOSUPPORT;
  35        };
  36        data.type = FILTER_IPV4_5TUPLE;
  37        data.u.ipv4.src_addr = ntohl(keys->addrs.v4addrs.src);
  38        data.u.ipv4.dst_addr = ntohl(keys->addrs.v4addrs.dst);
  39        data.u.ipv4.src_port = ntohs(keys->ports.src);
  40        data.u.ipv4.dst_port = ntohs(keys->ports.dst);
  41        data.u.ipv4.flags = FILTER_FIELDS_IPV4_5TUPLE;
  42
  43        spin_lock_bh(&enic->devcmd_lock);
  44        res = vnic_dev_classifier(enic->vdev, CLSF_ADD, &rq, &data);
  45        spin_unlock_bh(&enic->devcmd_lock);
  46        res = (res == 0) ? rq : res;
  47
  48        return res;
  49}
  50
  51/* enic_delfltr - Delete clsf filter
  52 *      @enic: enic struct of vnic
  53 *      @filter_id: filter_is(hardware_id) of filter to be deleted
  54 *
  55 * This function returns zero in case of success, negative number incase of
  56 * error.
  57 */
  58int enic_delfltr(struct enic *enic, u16 filter_id)
  59{
  60        int ret;
  61
  62        spin_lock_bh(&enic->devcmd_lock);
  63        ret = vnic_dev_classifier(enic->vdev, CLSF_DEL, &filter_id, NULL);
  64        spin_unlock_bh(&enic->devcmd_lock);
  65
  66        return ret;
  67}
  68
  69/* enic_rfs_flw_tbl_init - initialize enic->rfs_h members
  70 *      @enic: enic data
  71 */
  72void enic_rfs_flw_tbl_init(struct enic *enic)
  73{
  74        int i;
  75
  76        spin_lock_init(&enic->rfs_h.lock);
  77        for (i = 0; i <= ENIC_RFS_FLW_MASK; i++)
  78                INIT_HLIST_HEAD(&enic->rfs_h.ht_head[i]);
  79        enic->rfs_h.max = enic->config.num_arfs;
  80        enic->rfs_h.free = enic->rfs_h.max;
  81        enic->rfs_h.toclean = 0;
  82}
  83
  84void enic_rfs_flw_tbl_free(struct enic *enic)
  85{
  86        int i;
  87
  88        enic_rfs_timer_stop(enic);
  89        spin_lock_bh(&enic->rfs_h.lock);
  90        for (i = 0; i < (1 << ENIC_RFS_FLW_BITSHIFT); i++) {
  91                struct hlist_head *hhead;
  92                struct hlist_node *tmp;
  93                struct enic_rfs_fltr_node *n;
  94
  95                hhead = &enic->rfs_h.ht_head[i];
  96                hlist_for_each_entry_safe(n, tmp, hhead, node) {
  97                        enic_delfltr(enic, n->fltr_id);
  98                        hlist_del(&n->node);
  99                        kfree(n);
 100                        enic->rfs_h.free++;
 101                }
 102        }
 103        spin_unlock_bh(&enic->rfs_h.lock);
 104}
 105
 106struct enic_rfs_fltr_node *htbl_fltr_search(struct enic *enic, u16 fltr_id)
 107{
 108        int i;
 109
 110        for (i = 0; i < (1 << ENIC_RFS_FLW_BITSHIFT); i++) {
 111                struct hlist_head *hhead;
 112                struct hlist_node *tmp;
 113                struct enic_rfs_fltr_node *n;
 114
 115                hhead = &enic->rfs_h.ht_head[i];
 116                hlist_for_each_entry_safe(n, tmp, hhead, node)
 117                        if (n->fltr_id == fltr_id)
 118                                return n;
 119        }
 120
 121        return NULL;
 122}
 123
 124#ifdef CONFIG_RFS_ACCEL
 125void enic_flow_may_expire(struct timer_list *t)
 126{
 127        struct enic *enic = from_timer(enic, t, rfs_h.rfs_may_expire);
 128        bool res;
 129        int j;
 130
 131        spin_lock_bh(&enic->rfs_h.lock);
 132        for (j = 0; j < ENIC_CLSF_EXPIRE_COUNT; j++) {
 133                struct hlist_head *hhead;
 134                struct hlist_node *tmp;
 135                struct enic_rfs_fltr_node *n;
 136
 137                hhead = &enic->rfs_h.ht_head[enic->rfs_h.toclean++];
 138                hlist_for_each_entry_safe(n, tmp, hhead, node) {
 139                        res = rps_may_expire_flow(enic->netdev, n->rq_id,
 140                                                  n->flow_id, n->fltr_id);
 141                        if (res) {
 142                                res = enic_delfltr(enic, n->fltr_id);
 143                                if (unlikely(res))
 144                                        continue;
 145                                hlist_del(&n->node);
 146                                kfree(n);
 147                                enic->rfs_h.free++;
 148                        }
 149                }
 150        }
 151        spin_unlock_bh(&enic->rfs_h.lock);
 152        mod_timer(&enic->rfs_h.rfs_may_expire, jiffies + HZ/4);
 153}
 154
 155static struct enic_rfs_fltr_node *htbl_key_search(struct hlist_head *h,
 156                                                  struct flow_keys *k)
 157{
 158        struct enic_rfs_fltr_node *tpos;
 159
 160        hlist_for_each_entry(tpos, h, node)
 161                if (tpos->keys.addrs.v4addrs.src == k->addrs.v4addrs.src &&
 162                    tpos->keys.addrs.v4addrs.dst == k->addrs.v4addrs.dst &&
 163                    tpos->keys.ports.ports == k->ports.ports &&
 164                    tpos->keys.basic.ip_proto == k->basic.ip_proto &&
 165                    tpos->keys.basic.n_proto == k->basic.n_proto)
 166                        return tpos;
 167        return NULL;
 168}
 169
 170int enic_rx_flow_steer(struct net_device *dev, const struct sk_buff *skb,
 171                       u16 rxq_index, u32 flow_id)
 172{
 173        struct flow_keys keys;
 174        struct enic_rfs_fltr_node *n;
 175        struct enic *enic;
 176        u16 tbl_idx;
 177        int res, i;
 178
 179        enic = netdev_priv(dev);
 180        res = skb_flow_dissect_flow_keys(skb, &keys, 0);
 181        if (!res || keys.basic.n_proto != htons(ETH_P_IP) ||
 182            (keys.basic.ip_proto != IPPROTO_TCP &&
 183             keys.basic.ip_proto != IPPROTO_UDP))
 184                return -EPROTONOSUPPORT;
 185
 186        tbl_idx = skb_get_hash_raw(skb) & ENIC_RFS_FLW_MASK;
 187        spin_lock_bh(&enic->rfs_h.lock);
 188        n = htbl_key_search(&enic->rfs_h.ht_head[tbl_idx], &keys);
 189
 190        if (n) { /* entry already present  */
 191                if (rxq_index == n->rq_id) {
 192                        res = -EEXIST;
 193                        goto ret_unlock;
 194                }
 195
 196                /* desired rq changed for the flow, we need to delete
 197                 * old fltr and add new one
 198                 *
 199                 * The moment we delete the fltr, the upcoming pkts
 200                 * are put it default rq based on rss. When we add
 201                 * new filter, upcoming pkts are put in desired queue.
 202                 * This could cause ooo pkts.
 203                 *
 204                 * Lets 1st try adding new fltr and then del old one.
 205                 */
 206                i = --enic->rfs_h.free;
 207                /* clsf tbl is full, we have to del old fltr first*/
 208                if (unlikely(i < 0)) {
 209                        enic->rfs_h.free++;
 210                        res = enic_delfltr(enic, n->fltr_id);
 211                        if (unlikely(res < 0))
 212                                goto ret_unlock;
 213                        res = enic_addfltr_5t(enic, &keys, rxq_index);
 214                        if (res < 0) {
 215                                hlist_del(&n->node);
 216                                enic->rfs_h.free++;
 217                                goto ret_unlock;
 218                        }
 219                /* add new fltr 1st then del old fltr */
 220                } else {
 221                        int ret;
 222
 223                        res = enic_addfltr_5t(enic, &keys, rxq_index);
 224                        if (res < 0) {
 225                                enic->rfs_h.free++;
 226                                goto ret_unlock;
 227                        }
 228                        ret = enic_delfltr(enic, n->fltr_id);
 229                        /* deleting old fltr failed. Add old fltr to list.
 230                         * enic_flow_may_expire() will try to delete it later.
 231                         */
 232                        if (unlikely(ret < 0)) {
 233                                struct enic_rfs_fltr_node *d;
 234                                struct hlist_head *head;
 235
 236                                head = &enic->rfs_h.ht_head[tbl_idx];
 237                                d = kmalloc(sizeof(*d), GFP_ATOMIC);
 238                                if (d) {
 239                                        d->fltr_id = n->fltr_id;
 240                                        INIT_HLIST_NODE(&d->node);
 241                                        hlist_add_head(&d->node, head);
 242                                }
 243                        } else {
 244                                enic->rfs_h.free++;
 245                        }
 246                }
 247                n->rq_id = rxq_index;
 248                n->fltr_id = res;
 249                n->flow_id = flow_id;
 250        /* entry not present */
 251        } else {
 252                i = --enic->rfs_h.free;
 253                if (i <= 0) {
 254                        enic->rfs_h.free++;
 255                        res = -EBUSY;
 256                        goto ret_unlock;
 257                }
 258
 259                n = kmalloc(sizeof(*n), GFP_ATOMIC);
 260                if (!n) {
 261                        res = -ENOMEM;
 262                        enic->rfs_h.free++;
 263                        goto ret_unlock;
 264                }
 265
 266                res = enic_addfltr_5t(enic, &keys, rxq_index);
 267                if (res < 0) {
 268                        kfree(n);
 269                        enic->rfs_h.free++;
 270                        goto ret_unlock;
 271                }
 272                n->rq_id = rxq_index;
 273                n->fltr_id = res;
 274                n->flow_id = flow_id;
 275                n->keys = keys;
 276                INIT_HLIST_NODE(&n->node);
 277                hlist_add_head(&n->node, &enic->rfs_h.ht_head[tbl_idx]);
 278        }
 279
 280ret_unlock:
 281        spin_unlock_bh(&enic->rfs_h.lock);
 282        return res;
 283}
 284
 285#endif /* CONFIG_RFS_ACCEL */
 286