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 #ifdef CONFIG_RFS_ACCEL
 107 void enic_flow_may_expire(unsigned long data)
 108 {
 109         struct enic *enic = (struct enic *)data;
 110         bool res;
 111         int j;
 112
 113         spin_lock(&enic->rfs_h.lock);
 114         for (j = 0; j < ENIC_CLSF_EXPIRE_COUNT; j++) {
 115                 struct hlist_head *hhead;
 116                 struct hlist_node *tmp;
 117                 struct enic_rfs_fltr_node *n;
 118
 119                 hhead = &enic->rfs_h.ht_head[enic->rfs_h.toclean++];
 120                 hlist_for_each_entry_safe(n, tmp, hhead, node) {
 121                         res = rps_may_expire_flow(enic->netdev, n->rq_id,
 122                                                   n->flow_id, n->fltr_id);
 123                         if (res) {
 124                                 res = enic_delfltr(enic, n->fltr_id);
 125                                 if (unlikely(res))
 126                                         continue;
 127                                 hlist_del(&n->node);
 128                                 kfree(n);
 129                                 enic->rfs_h.free++;
 130                         }
 131                 }
 132         }
 133         spin_unlock(&enic->rfs_h.lock);
 134         mod_timer(&enic->rfs_h.rfs_may_expire, jiffies + HZ/4);
 135 }
 136
 137 static struct enic_rfs_fltr_node *htbl_key_search(struct hlist_head *h,
 138                                                   struct flow_keys *k)
 139 {
 140         struct enic_rfs_fltr_node *tpos;
 141
 142         hlist_for_each_entry(tpos, h, node)
 143                 if (tpos->keys.src == k->src &&
 144                     tpos->keys.dst == k->dst &&
 145                     tpos->keys.ports == k->ports &&
 146                     tpos->keys.ip_proto == k->ip_proto &&
 147                     tpos->keys.n_proto == k->n_proto)
 148                         return tpos;
 149         return NULL;
 150 }
 151
 152 int enic_rx_flow_steer(struct net_device *dev, const struct sk_buff *skb,
 153                        u16 rxq_index, u32 flow_id)
 154 {
 155         struct flow_keys keys;
 156         struct enic_rfs_fltr_node *n;
 157         struct enic *enic;
 158         u16 tbl_idx;
 159         int res, i;
 160
 161         enic = netdev_priv(dev);
 162         res = skb_flow_dissect(skb, &keys);
 163         if (!res || keys.n_proto != htons(ETH_P_IP) ||
 164             (keys.ip_proto != IPPROTO_TCP && keys.ip_proto != IPPROTO_UDP))
 165                 return -EPROTONOSUPPORT;
 166
 167         tbl_idx = skb_get_hash_raw(skb) & ENIC_RFS_FLW_MASK;
 168         spin_lock(&enic->rfs_h.lock);
 169         n = htbl_key_search(&enic->rfs_h.ht_head[tbl_idx], &keys);
 170
 171         if (n) { /* entry already present  */
 172                 if (rxq_index == n->rq_id) {
 173                         res = -EEXIST;
 174                         goto ret_unlock;
 175                 }
 176
 177                 /* desired rq changed for the flow, we need to delete
 178                  * old fltr and add new one
 179                  *
 180                  * The moment we delete the fltr, the upcoming pkts
 181                  * are put it default rq based on rss. When we add
 182                  * new filter, upcoming pkts are put in desired queue.
 183                  * This could cause ooo pkts.
 184                  *
 185                  * Lets 1st try adding new fltr and then del old one.
 186                  */
 187                 i = --enic->rfs_h.free;
 188                 /* clsf tbl is full, we have to del old fltr first*/
 189                 if (unlikely(i < 0)) {
 190                         enic->rfs_h.free++;
 191                         res = enic_delfltr(enic, n->fltr_id);
 192                         if (unlikely(res < 0))
 193                                 goto ret_unlock;
 194                         res = enic_addfltr_5t(enic, &keys, rxq_index);
 195                         if (res < 0) {
 196                                 hlist_del(&n->node);
 197                                 enic->rfs_h.free++;
 198                                 goto ret_unlock;
 199                         }
 200                 /* add new fltr 1st then del old fltr */
 201                 } else {
 202                         int ret;
 203
 204                         res = enic_addfltr_5t(enic, &keys, rxq_index);
 205                         if (res < 0) {
 206                                 enic->rfs_h.free++;
 207                                 goto ret_unlock;
 208                         }
 209                         ret = enic_delfltr(enic, n->fltr_id);
 210                         /* deleting old fltr failed. Add old fltr to list.
 211                          * enic_flow_may_expire() will try to delete it later.
 212                          */
 213                         if (unlikely(ret < 0)) {
 214                                 struct enic_rfs_fltr_node *d;
 215                                 struct hlist_head *head;
 216
 217                                 head = &enic->rfs_h.ht_head[tbl_idx];
 218                                 d = kmalloc(sizeof(*d), GFP_ATOMIC);
 219                                 if (d) {
 220                                         d->fltr_id = n->fltr_id;
 221                                         INIT_HLIST_NODE(&d->node);
 222                                         hlist_add_head(&d->node, head);
 223                                 }
 224                         } else {
 225                                 enic->rfs_h.free++;
 226                         }
 227                 }
 228                 n->rq_id = rxq_index;
 229                 n->fltr_id = res;
 230                 n->flow_id = flow_id;
 231         /* entry not present */
 232         } else {
 233                 i = --enic->rfs_h.free;
 234                 if (i <= 0) {
 235                         enic->rfs_h.free++;
 236                         res = -EBUSY;
 237                         goto ret_unlock;
 238                 }
 239
 240                 n = kmalloc(sizeof(*n), GFP_ATOMIC);
 241                 if (!n) {
 242                         res = -ENOMEM;
 243                         enic->rfs_h.free++;
 244                         goto ret_unlock;
 245                 }
 246
 247                 res = enic_addfltr_5t(enic, &keys, rxq_index);
 248                 if (res < 0) {
 249                         kfree(n);
 250                         enic->rfs_h.free++;
 251                         goto ret_unlock;
 252                 }
 253                 n->rq_id = rxq_index;
 254                 n->fltr_id = res;
 255                 n->flow_id = flow_id;
 256                 n->keys = keys;
 257                 INIT_HLIST_NODE(&n->node);
 258                 hlist_add_head(&n->node, &enic->rfs_h.ht_head[tbl_idx]);
 259         }
 260
 261 ret_unlock:
 262         spin_unlock(&enic->rfs_h.lock);
 263         return res;
 264 }
 265
 266 #endif /* CONFIG_RFS_ACCEL */