drivers/infiniband/hw/usnic/usnic_fwd.c

   1 /*
   2  * Copyright (c) 2013, Cisco Systems, Inc. All rights reserved.
   3  *
   4  * This software is available to you under a choice of one of two
   5  * licenses.  You may choose to be licensed under the terms of the GNU
   6  * General Public License (GPL) Version 2, available from the file
   7  * COPYING in the main directory of this source tree, or the
   8  * BSD license below:
   9  *
  10  *     Redistribution and use in source and binary forms, with or
  11  *     without modification, are permitted provided that the following
  12  *     conditions are met:
  13  *
  14  *      - Redistributions of source code must retain the above
  15  *        copyright notice, this list of conditions and the following
  16  *        disclaimer.
  17  *
  18  *      - Redistributions in binary form must reproduce the above
  19  *        copyright notice, this list of conditions and the following
  20  *        disclaimer in the documentation and/or other materials
  21  *        provided with the distribution.
  22  *
  23  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  24  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  25  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  26  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  27  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  28  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  29  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  30  * SOFTWARE.
  31  *
  32  */
  33 #include <linux/netdevice.h>
  34 #include <linux/pci.h>
  35
  36 #include "enic_api.h"
  37 #include "usnic_common_pkt_hdr.h"
  38 #include "usnic_fwd.h"
  39 #include "usnic_log.h"
  40
  41 static int usnic_fwd_devcmd_locked(struct usnic_fwd_dev *ufdev, int vnic_idx,
  42                                         enum vnic_devcmd_cmd cmd, u64 *a0,
  43                                         u64 *a1)
  44 {
  45         int status;
  46         struct net_device *netdev = ufdev->netdev;
  47
  48         lockdep_assert_held(&ufdev->lock);
  49
  50         status = enic_api_devcmd_proxy_by_index(netdev,
  51                         vnic_idx,
  52                         cmd,
  53                         a0, a1,
  54                         1000);
  55         if (status) {
  56                 if (status == ERR_EINVAL && cmd == CMD_DEL_FILTER) {
  57                         usnic_dbg("Dev %s vnic idx %u cmd %u already deleted",
  58                                         ufdev->name, vnic_idx, cmd);
  59                 } else {
  60                         usnic_err("Dev %s vnic idx %u cmd %u failed with status %d\n",
  61                                         ufdev->name, vnic_idx, cmd,
  62                                         status);
  63                 }
  64         } else {
  65                 usnic_dbg("Dev %s vnic idx %u cmd %u success",
  66                                 ufdev->name, vnic_idx, cmd);
  67         }
  68
  69         return status;
  70 }
  71
  72 static int usnic_fwd_devcmd(struct usnic_fwd_dev *ufdev, int vnic_idx,
  73                                 enum vnic_devcmd_cmd cmd, u64 *a0, u64 *a1)
  74 {
  75         int status;
  76
  77         spin_lock(&ufdev->lock);
  78         status = usnic_fwd_devcmd_locked(ufdev, vnic_idx, cmd, a0, a1);
  79         spin_unlock(&ufdev->lock);
  80
  81         return status;
  82 }
  83
  84 struct usnic_fwd_dev *usnic_fwd_dev_alloc(struct pci_dev *pdev)
  85 {
  86         struct usnic_fwd_dev *ufdev;
  87
  88         ufdev = kzalloc(sizeof(*ufdev), GFP_KERNEL);
  89         if (!ufdev)
  90                 return NULL;
  91
  92         ufdev->pdev = pdev;
  93         ufdev->netdev = pci_get_drvdata(pdev);
  94         spin_lock_init(&ufdev->lock);
  95         strncpy(ufdev->name, netdev_name(ufdev->netdev),
  96                         sizeof(ufdev->name) - 1);
  97
  98         return ufdev;
  99 }
 100
 101 void usnic_fwd_dev_free(struct usnic_fwd_dev *ufdev)
 102 {
 103         kfree(ufdev);
 104 }
 105
 106 void usnic_fwd_set_mac(struct usnic_fwd_dev *ufdev, char mac[ETH_ALEN])
 107 {
 108         spin_lock(&ufdev->lock);
 109         memcpy(&ufdev->mac, mac, sizeof(ufdev->mac));
 110         spin_unlock(&ufdev->lock);
 111 }
 112
 113 void usnic_fwd_add_ipaddr(struct usnic_fwd_dev *ufdev, __be32 inaddr)
 114 {
 115         spin_lock(&ufdev->lock);
 116         if (!ufdev->inaddr)
 117                 ufdev->inaddr = inaddr;
 118         spin_unlock(&ufdev->lock);
 119 }
 120
 121 void usnic_fwd_del_ipaddr(struct usnic_fwd_dev *ufdev)
 122 {
 123         spin_lock(&ufdev->lock);
 124         ufdev->inaddr = 0;
 125         spin_unlock(&ufdev->lock);
 126 }
 127
 128 void usnic_fwd_carrier_up(struct usnic_fwd_dev *ufdev)
 129 {
 130         spin_lock(&ufdev->lock);
 131         ufdev->link_up = 1;
 132         spin_unlock(&ufdev->lock);
 133 }
 134
 135 void usnic_fwd_carrier_down(struct usnic_fwd_dev *ufdev)
 136 {
 137         spin_lock(&ufdev->lock);
 138         ufdev->link_up = 0;
 139         spin_unlock(&ufdev->lock);
 140 }
 141
 142 void usnic_fwd_set_mtu(struct usnic_fwd_dev *ufdev, unsigned int mtu)
 143 {
 144         spin_lock(&ufdev->lock);
 145         ufdev->mtu = mtu;
 146         spin_unlock(&ufdev->lock);
 147 }
 148
 149 static int usnic_fwd_dev_ready_locked(struct usnic_fwd_dev *ufdev)
 150 {
 151         lockdep_assert_held(&ufdev->lock);
 152
 153         if (!ufdev->link_up)
 154                 return -EPERM;
 155
 156         return 0;
 157 }
 158
 159 static int validate_filter_locked(struct usnic_fwd_dev *ufdev,
 160                                         struct filter *filter)
 161 {
 162
 163         lockdep_assert_held(&ufdev->lock);
 164
 165         if (filter->type == FILTER_IPV4_5TUPLE) {
 166                 if (!(filter->u.ipv4.flags & FILTER_FIELD_5TUP_DST_AD))
 167                         return -EACCES;
 168                 if (!(filter->u.ipv4.flags & FILTER_FIELD_5TUP_DST_PT))
 169                         return -EBUSY;
 170                 else if (ufdev->inaddr == 0)
 171                         return -EINVAL;
 172                 else if (filter->u.ipv4.dst_port == 0)
 173                         return -ERANGE;
 174                 else if (ntohl(ufdev->inaddr) != filter->u.ipv4.dst_addr)
 175                         return -EFAULT;
 176                 else
 177                         return 0;
 178         }
 179
 180         return 0;
 181 }
 182
 183 static void fill_tlv(struct filter_tlv *tlv, struct filter *filter,
 184                 struct filter_action *action)
 185 {
 186         tlv->type = CLSF_TLV_FILTER;
 187         tlv->length = sizeof(struct filter);
 188         *((struct filter *)&tlv->val) = *filter;
 189
 190         tlv = (struct filter_tlv *)((char *)tlv + sizeof(struct filter_tlv) +
 191                         sizeof(struct filter));
 192         tlv->type = CLSF_TLV_ACTION;
 193         tlv->length = sizeof(struct filter_action);
 194         *((struct filter_action *)&tlv->val) = *action;
 195 }
 196
 197 struct usnic_fwd_flow*
 198 usnic_fwd_alloc_flow(struct usnic_fwd_dev *ufdev, struct filter *filter,
 199                                 struct usnic_filter_action *uaction)
 200 {
 201         struct filter_tlv *tlv;
 202         struct pci_dev *pdev;
 203         struct usnic_fwd_flow *flow;
 204         uint64_t a0, a1;
 205         uint64_t tlv_size;
 206         dma_addr_t tlv_pa;
 207         int status;
 208
 209         pdev = ufdev->pdev;
 210         tlv_size = (2*sizeof(struct filter_tlv) + sizeof(struct filter) +
 211                         sizeof(struct filter_action));
 212
 213         flow = kzalloc(sizeof(*flow), GFP_ATOMIC);
 214         if (!flow)
 215                 return ERR_PTR(-ENOMEM);
 216
 217         tlv = pci_alloc_consistent(pdev, tlv_size, &tlv_pa);
 218         if (!tlv) {
 219                 usnic_err("Failed to allocate memory\n");
 220                 status = -ENOMEM;
 221                 goto out_free_flow;
 222         }
 223
 224         fill_tlv(tlv, filter, &uaction->action);
 225
 226         spin_lock(&ufdev->lock);
 227         status = usnic_fwd_dev_ready_locked(ufdev);
 228         if (status) {
 229                 usnic_err("Forwarding dev %s not ready with status %d\n",
 230                                 ufdev->name, status);
 231                 goto out_free_tlv;
 232         }
 233
 234         status = validate_filter_locked(ufdev, filter);
 235         if (status) {
 236                 usnic_err("Failed to validate filter with status %d\n",
 237                                 status);
 238                 goto out_free_tlv;
 239         }
 240
 241         /* Issue Devcmd */
 242         a0 = tlv_pa;
 243         a1 = tlv_size;
 244         status = usnic_fwd_devcmd_locked(ufdev, uaction->vnic_idx,
 245                                                 CMD_ADD_FILTER, &a0, &a1);
 246         if (status) {
 247                 usnic_err("VF %s Filter add failed with status:%d",
 248                                 ufdev->name, status);
 249                 status = -EFAULT;
 250                 goto out_free_tlv;
 251         } else {
 252                 usnic_dbg("VF %s FILTER ID:%llu", ufdev->name, a0);
 253         }
 254
 255         flow->flow_id = (uint32_t) a0;
 256         flow->vnic_idx = uaction->vnic_idx;
 257         flow->ufdev = ufdev;
 258
 259 out_free_tlv:
 260         spin_unlock(&ufdev->lock);
 261         pci_free_consistent(pdev, tlv_size, tlv, tlv_pa);
 262         if (!status)
 263                 return flow;
 264 out_free_flow:
 265         kfree(flow);
 266         return ERR_PTR(status);
 267 }
 268
 269 int usnic_fwd_dealloc_flow(struct usnic_fwd_flow *flow)
 270 {
 271         int status;
 272         u64 a0, a1;
 273
 274         a0 = flow->flow_id;
 275
 276         status = usnic_fwd_devcmd(flow->ufdev, flow->vnic_idx,
 277                                         CMD_DEL_FILTER, &a0, &a1);
 278         if (status) {
 279                 if (status == ERR_EINVAL) {
 280                         usnic_dbg("Filter %u already deleted for VF Idx %u pf: %s status: %d",
 281                                         flow->flow_id, flow->vnic_idx,
 282                                         flow->ufdev->name, status);
 283                 } else {
 284                         usnic_err("PF %s VF Idx %u Filter: %u FILTER DELETE failed with status %d",
 285                                         flow->ufdev->name, flow->vnic_idx,
 286                                         flow->flow_id, status);
 287                 }
 288                 status = 0;
 289                 /*
 290                  * Log the error and fake success to the caller because if
 291                  * a flow fails to be deleted in the firmware, it is an
 292                  * unrecoverable error.
 293                  */
 294         } else {
 295                 usnic_dbg("PF %s VF Idx %u Filter: %u FILTER DELETED",
 296                                 flow->ufdev->name, flow->vnic_idx,
 297                                 flow->flow_id);
 298         }
 299
 300         kfree(flow);
 301         return status;
 302 }
 303
 304 int usnic_fwd_enable_qp(struct usnic_fwd_dev *ufdev, int vnic_idx, int qp_idx)
 305 {
 306         int status;
 307         struct net_device *pf_netdev;
 308         u64 a0, a1;
 309
 310         pf_netdev = ufdev->netdev;
 311         a0 = qp_idx;
 312         a1 = CMD_QP_RQWQ;
 313
 314         status = usnic_fwd_devcmd(ufdev, vnic_idx, CMD_QP_ENABLE,
 315                                                 &a0, &a1);
 316         if (status) {
 317                 usnic_err("PF %s VNIC Index %u RQ Index: %u ENABLE Failed with status %d",
 318                                 netdev_name(pf_netdev),
 319                                 vnic_idx,
 320                                 qp_idx,
 321                                 status);
 322         } else {
 323                 usnic_dbg("PF %s VNIC Index %u RQ Index: %u ENABLED",
 324                                 netdev_name(pf_netdev),
 325                                 vnic_idx, qp_idx);
 326         }
 327
 328         return status;
 329 }
 330
 331 int usnic_fwd_disable_qp(struct usnic_fwd_dev *ufdev, int vnic_idx, int qp_idx)
 332 {
 333         int status;
 334         u64 a0, a1;
 335         struct net_device *pf_netdev;
 336
 337         pf_netdev = ufdev->netdev;
 338         a0 = qp_idx;
 339         a1 = CMD_QP_RQWQ;
 340
 341         status = usnic_fwd_devcmd(ufdev, vnic_idx, CMD_QP_DISABLE,
 342                         &a0, &a1);
 343         if (status) {
 344                 usnic_err("PF %s VNIC Index %u RQ Index: %u DISABLE Failed with status %d",
 345                                 netdev_name(pf_netdev),
 346                                 vnic_idx,
 347                                 qp_idx,
 348                                 status);
 349         } else {
 350                 usnic_dbg("PF %s VNIC Index %u RQ Index: %u DISABLED",
 351                                 netdev_name(pf_netdev),
 352                                 vnic_idx,
 353                                 qp_idx);
 354         }
 355
 356         return status;
 357 }