drivers/net/ethernet/cisco/enic/enic_clsf.c

   1 #include <linux/if.h>
   2 #include <linux/if_ether.h>
   3 #include <linux/if_link.h>
   4 #include <linux/netdevice.h>
   5 #include <linux/in.h>
   6 #include <linux/types.h>
   7 #include <linux/skbuff.h>
   8 #include <net/flow_keys.h>
   9 #include "enic_res.h"
  10 #include "enic_clsf.h"
  11
  12 /* enic_addfltr_5t - Add ipv4 5tuple filter
  13  *      @enic: enic struct of vnic
  14  *      @keys: flow_keys of ipv4 5tuple
  15  *      @rq: rq number to steer to
  16  *
  17  * This function returns filter_id(hardware_id) of the filter
  18  * added. In case of error it returns an negative number.
  19  */
  20 int enic_addfltr_5t(struct enic *enic, struct flow_keys *keys, u16 rq)
  21 {
  22         int res;
  23         struct filter data;
  24
  25         switch (keys->ip_proto) {
  26         case IPPROTO_TCP:
  27                 data.u.ipv4.protocol = PROTO_TCP;
  28                 break;
  29         case IPPROTO_UDP:
  30                 data.u.ipv4.protocol = PROTO_UDP;
  31                 break;
  32         default:
  33                 return -EPROTONOSUPPORT;
  34         };
  35         data.type = FILTER_IPV4_5TUPLE;
  36         data.u.ipv4.src_addr = ntohl(keys->src);
  37         data.u.ipv4.dst_addr = ntohl(keys->dst);
  38         data.u.ipv4.src_port = ntohs(keys->port16[0]);
  39         data.u.ipv4.dst_port = ntohs(keys->port16[1]);
  40         data.u.ipv4.flags = FILTER_FIELDS_IPV4_5TUPLE;
  41
  42         spin_lock_bh(&enic->devcmd_lock);
  43         res = vnic_dev_classifier(enic->vdev, CLSF_ADD, &rq, &data);
  44         spin_unlock_bh(&enic->devcmd_lock);
  45         res = (res == 0) ? rq : res;
  46
  47         return res;
  48 }
  49
  50 /* enic_delfltr - Delete clsf filter
  51  *      @enic: enic struct of vnic
  52  *      @filter_id: filter_is(hardware_id) of filter to be deleted
  53  *
  54  * This function returns zero in case of success, negative number incase of
  55  * error.
  56  */
  57 int enic_delfltr(struct enic *enic, u16 filter_id)
  58 {
  59         int ret;
  60
  61         spin_lock_bh(&enic->devcmd_lock);
  62         ret = vnic_dev_classifier(enic->vdev, CLSF_DEL, &filter_id, NULL);
  63         spin_unlock_bh(&enic->devcmd_lock);
  64
  65         return ret;
  66 }
  67
  68 /* enic_rfs_flw_tbl_init - initialize enic->rfs_h members
  69  *      @enic: enic data
  70  */
  71 void enic_rfs_flw_tbl_init(struct enic *enic)
  72 {
  73         int i;
  74
  75         spin_lock_init(&enic->rfs_h.lock);
  76         for (i = 0; i <= ENIC_RFS_FLW_MASK; i++)
  77                 INIT_HLIST_HEAD(&enic->rfs_h.ht_head[i]);
  78         enic->rfs_h.max = enic->config.num_arfs;
  79         enic->rfs_h.free = enic->rfs_h.max;
  80         enic->rfs_h.toclean = 0;
  81         enic_rfs_timer_start(enic);
  82 }
  83
  84 void enic_rfs_flw_tbl_free(struct enic *enic)
  85 {
  86         int i;
  87
  88         enic_rfs_timer_stop(enic);
  89         spin_lock(&enic->rfs_h.lock);
  90         enic->rfs_h.free = 0;
  91         for (i = 0; i < (1 << ENIC_RFS_FLW_BITSHIFT); i++) {
  92                 struct hlist_head *hhead;
  93                 struct hlist_node *tmp;
  94                 struct enic_rfs_fltr_node *n;
  95
  96                 hhead = &enic->rfs_h.ht_head[i];
  97                 hlist_for_each_entry_safe(n, tmp, hhead, node) {
  98                         enic_delfltr(enic, n->fltr_id);
  99                         hlist_del(&n->node);
 100                         kfree(n);
 101                 }
 102         }
 103         spin_unlock(&enic->rfs_h.lock);
 104 }
 105
 106 struct 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
 125 void enic_flow_may_expire(unsigned long data)
 126 {
 127         struct enic *enic = (struct enic *)data;
 128         bool res;
 129         int j;
 130
 131         spin_lock(&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(&enic->rfs_h.lock);
 152         mod_timer(&enic->rfs_h.rfs_may_expire, jiffies + HZ/4);
 153 }
 154
 155 static 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.src == k->src &&
 162                     tpos->keys.dst == k->dst &&
 163                     tpos->keys.ports == k->ports &&
 164                     tpos->keys.ip_proto == k->ip_proto &&
 165                     tpos->keys.n_proto == k->n_proto)
 166                         return tpos;
 167         return NULL;
 168 }
 169
 170 int 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(skb, &keys);
 181         if (!res || keys.n_proto != htons(ETH_P_IP) ||
 182             (keys.ip_proto != IPPROTO_TCP && keys.ip_proto != IPPROTO_UDP))
 183                 return -EPROTONOSUPPORT;
 184
 185         tbl_idx = skb_get_hash_raw(skb) & ENIC_RFS_FLW_MASK;
 186         spin_lock(&enic->rfs_h.lock);
 187         n = htbl_key_search(&enic->rfs_h.ht_head[tbl_idx], &keys);
 188
 189         if (n) { /* entry already present  */
 190                 if (rxq_index == n->rq_id) {
 191                         res = -EEXIST;
 192                         goto ret_unlock;
 193                 }
 194
 195                 /* desired rq changed for the flow, we need to delete
 196                  * old fltr and add new one
 197                  *
 198                  * The moment we delete the fltr, the upcoming pkts
 199                  * are put it default rq based on rss. When we add
 200                  * new filter, upcoming pkts are put in desired queue.
 201                  * This could cause ooo pkts.
 202                  *
 203                  * Lets 1st try adding new fltr and then del old one.
 204                  */
 205                 i = --enic->rfs_h.free;
 206                 /* clsf tbl is full, we have to del old fltr first*/
 207                 if (unlikely(i < 0)) {
 208                         enic->rfs_h.free++;
 209                         res = enic_delfltr(enic, n->fltr_id);
 210                         if (unlikely(res < 0))
 211                                 goto ret_unlock;
 212                         res = enic_addfltr_5t(enic, &keys, rxq_index);
 213                         if (res < 0) {
 214                                 hlist_del(&n->node);
 215                                 enic->rfs_h.free++;
 216                                 goto ret_unlock;
 217                         }
 218                 /* add new fltr 1st then del old fltr */
 219                 } else {
 220                         int ret;
 221
 222                         res = enic_addfltr_5t(enic, &keys, rxq_index);
 223                         if (res < 0) {
 224                                 enic->rfs_h.free++;
 225                                 goto ret_unlock;
 226                         }
 227                         ret = enic_delfltr(enic, n->fltr_id);
 228                         /* deleting old fltr failed. Add old fltr to list.
 229                          * enic_flow_may_expire() will try to delete it later.
 230                          */
 231                         if (unlikely(ret < 0)) {
 232                                 struct enic_rfs_fltr_node *d;
 233                                 struct hlist_head *head;
 234
 235                                 head = &enic->rfs_h.ht_head[tbl_idx];
 236                                 d = kmalloc(sizeof(*d), GFP_ATOMIC);
 237                                 if (d) {
 238                                         d->fltr_id = n->fltr_id;
 239                                         INIT_HLIST_NODE(&d->node);
 240                                         hlist_add_head(&d->node, head);
 241                                 }
 242                         } else {
 243                                 enic->rfs_h.free++;
 244                         }
 245                 }
 246                 n->rq_id = rxq_index;
 247                 n->fltr_id = res;
 248                 n->flow_id = flow_id;
 249         /* entry not present */
 250         } else {
 251                 i = --enic->rfs_h.free;
 252                 if (i <= 0) {
 253                         enic->rfs_h.free++;
 254                         res = -EBUSY;
 255                         goto ret_unlock;
 256                 }
 257
 258                 n = kmalloc(sizeof(*n), GFP_ATOMIC);
 259                 if (!n) {
 260                         res = -ENOMEM;
 261                         enic->rfs_h.free++;
 262                         goto ret_unlock;
 263                 }
 264
 265                 res = enic_addfltr_5t(enic, &keys, rxq_index);
 266                 if (res < 0) {
 267                         kfree(n);
 268                         enic->rfs_h.free++;
 269                         goto ret_unlock;
 270                 }
 271                 n->rq_id = rxq_index;
 272                 n->fltr_id = res;
 273                 n->flow_id = flow_id;
 274                 n->keys = keys;
 275                 INIT_HLIST_NODE(&n->node);
 276                 hlist_add_head(&n->node, &enic->rfs_h.ht_head[tbl_idx]);
 277         }
 278
 279 ret_unlock:
 280         spin_unlock(&enic->rfs_h.lock);
 281         return res;
 282 }
 283
 284 #endif /* CONFIG_RFS_ACCEL */