diff options
Diffstat (limited to 'drivers/infiniband/hw/mlx4/ah.c')
| -rw-r--r-- | drivers/infiniband/hw/mlx4/ah.c | 257 |
1 files changed, 257 insertions, 0 deletions
diff --git a/drivers/infiniband/hw/mlx4/ah.c b/drivers/infiniband/hw/mlx4/ah.c new file mode 100644 index 000000000..e9e3a6f39 --- /dev/null +++ b/drivers/infiniband/hw/mlx4/ah.c @@ -0,0 +1,257 @@ +/* + * Copyright (c) 2007 Cisco Systems, Inc. All rights reserved. + * + * This software is available to you under a choice of one of two + * licenses. You may choose to be licensed under the terms of the GNU + * General Public License (GPL) Version 2, available from the file + * COPYING in the main directory of this source tree, or the + * OpenIB.org BSD license below: + * + * Redistribution and use in source and binary forms, with or + * without modification, are permitted provided that the following + * conditions are met: + * + * - Redistributions of source code must retain the above + * copyright notice, this list of conditions and the following + * disclaimer. + * + * - Redistributions in binary form must reproduce the above + * copyright notice, this list of conditions and the following + * disclaimer in the documentation and/or other materials + * provided with the distribution. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, + * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF + * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND + * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS + * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN + * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN + * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE + * SOFTWARE. + */ + +#include <rdma/ib_addr.h> +#include <rdma/ib_cache.h> + +#include <linux/slab.h> +#include <linux/inet.h> +#include <linux/string.h> +#include <linux/mlx4/driver.h> + +#include "mlx4_ib.h" + +static struct ib_ah *create_ib_ah(struct ib_pd *pd, + struct rdma_ah_attr *ah_attr, + struct mlx4_ib_ah *ah) +{ + struct mlx4_dev *dev = to_mdev(pd->device)->dev; + + ah->av.ib.port_pd = cpu_to_be32(to_mpd(pd)->pdn | + (rdma_ah_get_port_num(ah_attr) << 24)); + ah->av.ib.g_slid = rdma_ah_get_path_bits(ah_attr); + ah->av.ib.sl_tclass_flowlabel = + cpu_to_be32(rdma_ah_get_sl(ah_attr) << 28); + if (rdma_ah_get_ah_flags(ah_attr) & IB_AH_GRH) { + const struct ib_global_route *grh = rdma_ah_read_grh(ah_attr); + + ah->av.ib.g_slid |= 0x80; + ah->av.ib.gid_index = grh->sgid_index; + ah->av.ib.hop_limit = grh->hop_limit; + ah->av.ib.sl_tclass_flowlabel |= + cpu_to_be32((grh->traffic_class << 20) | + grh->flow_label); + memcpy(ah->av.ib.dgid, grh->dgid.raw, 16); + } + + ah->av.ib.dlid = cpu_to_be16(rdma_ah_get_dlid(ah_attr)); + if (rdma_ah_get_static_rate(ah_attr)) { + u8 static_rate = rdma_ah_get_static_rate(ah_attr) + + MLX4_STAT_RATE_OFFSET; + + while (static_rate > IB_RATE_2_5_GBPS + MLX4_STAT_RATE_OFFSET && + !(1 << static_rate & dev->caps.stat_rate_support)) + --static_rate; + ah->av.ib.stat_rate = static_rate; + } + + return &ah->ibah; +} + +static struct ib_ah *create_iboe_ah(struct ib_pd *pd, + struct rdma_ah_attr *ah_attr, + struct mlx4_ib_ah *ah) +{ + struct mlx4_ib_dev *ibdev = to_mdev(pd->device); + const struct ib_gid_attr *gid_attr; + struct mlx4_dev *dev = ibdev->dev; + int is_mcast = 0; + struct in6_addr in6; + u16 vlan_tag = 0xffff; + const struct ib_global_route *grh = rdma_ah_read_grh(ah_attr); + int ret; + + memcpy(&in6, grh->dgid.raw, sizeof(in6)); + if (rdma_is_multicast_addr(&in6)) + is_mcast = 1; + + memcpy(ah->av.eth.mac, ah_attr->roce.dmac, ETH_ALEN); + eth_zero_addr(ah->av.eth.s_mac); + + /* + * If sgid_attr is NULL we are being called by mlx4_ib_create_ah_slave + * and we are directly creating an AV for a slave's gid_index. + */ + gid_attr = ah_attr->grh.sgid_attr; + if (gid_attr) { + if (is_vlan_dev(gid_attr->ndev)) + vlan_tag = vlan_dev_vlan_id(gid_attr->ndev); + memcpy(ah->av.eth.s_mac, gid_attr->ndev->dev_addr, ETH_ALEN); + ret = mlx4_ib_gid_index_to_real_index(ibdev, gid_attr); + if (ret < 0) + return ERR_PTR(ret); + ah->av.eth.gid_index = ret; + } else { + /* mlx4_ib_create_ah_slave fills in the s_mac and the vlan */ + ah->av.eth.gid_index = ah_attr->grh.sgid_index; + } + + if (vlan_tag < 0x1000) + vlan_tag |= (rdma_ah_get_sl(ah_attr) & 7) << 13; + ah->av.eth.port_pd = cpu_to_be32(to_mpd(pd)->pdn | + (rdma_ah_get_port_num(ah_attr) << 24)); + ah->av.eth.vlan = cpu_to_be16(vlan_tag); + ah->av.eth.hop_limit = grh->hop_limit; + if (rdma_ah_get_static_rate(ah_attr)) { + ah->av.eth.stat_rate = rdma_ah_get_static_rate(ah_attr) + + MLX4_STAT_RATE_OFFSET; + while (ah->av.eth.stat_rate > IB_RATE_2_5_GBPS + MLX4_STAT_RATE_OFFSET && + !(1 << ah->av.eth.stat_rate & dev->caps.stat_rate_support)) + --ah->av.eth.stat_rate; + } + ah->av.eth.sl_tclass_flowlabel |= + cpu_to_be32((grh->traffic_class << 20) | + grh->flow_label); + /* + * HW requires multicast LID so we just choose one. + */ + if (is_mcast) + ah->av.ib.dlid = cpu_to_be16(0xc000); + + memcpy(ah->av.eth.dgid, grh->dgid.raw, 16); + ah->av.eth.sl_tclass_flowlabel |= cpu_to_be32(rdma_ah_get_sl(ah_attr) + << 29); + return &ah->ibah; +} + +struct ib_ah *mlx4_ib_create_ah(struct ib_pd *pd, struct rdma_ah_attr *ah_attr, + struct ib_udata *udata) + +{ + struct mlx4_ib_ah *ah; + struct ib_ah *ret; + + ah = kzalloc(sizeof *ah, GFP_ATOMIC); + if (!ah) + return ERR_PTR(-ENOMEM); + + if (ah_attr->type == RDMA_AH_ATTR_TYPE_ROCE) { + if (!(rdma_ah_get_ah_flags(ah_attr) & IB_AH_GRH)) { + ret = ERR_PTR(-EINVAL); + } else { + /* + * TBD: need to handle the case when we get + * called in an atomic context and there we + * might sleep. We don't expect this + * currently since we're working with link + * local addresses which we can translate + * without going to sleep. + */ + ret = create_iboe_ah(pd, ah_attr, ah); + } + + if (IS_ERR(ret)) + kfree(ah); + + return ret; + } else + return create_ib_ah(pd, ah_attr, ah); /* never fails */ +} + +/* AH's created via this call must be free'd by mlx4_ib_destroy_ah. */ +struct ib_ah *mlx4_ib_create_ah_slave(struct ib_pd *pd, + struct rdma_ah_attr *ah_attr, + int slave_sgid_index, u8 *s_mac, + u16 vlan_tag) +{ + struct rdma_ah_attr slave_attr = *ah_attr; + struct mlx4_ib_ah *mah; + struct ib_ah *ah; + + slave_attr.grh.sgid_attr = NULL; + slave_attr.grh.sgid_index = slave_sgid_index; + ah = mlx4_ib_create_ah(pd, &slave_attr, NULL); + if (IS_ERR(ah)) + return ah; + + ah->device = pd->device; + ah->pd = pd; + ah->type = ah_attr->type; + mah = to_mah(ah); + + /* get rid of force-loopback bit */ + mah->av.ib.port_pd &= cpu_to_be32(0x7FFFFFFF); + + if (ah_attr->type == RDMA_AH_ATTR_TYPE_ROCE) + memcpy(mah->av.eth.s_mac, s_mac, 6); + + if (vlan_tag < 0x1000) + vlan_tag |= (rdma_ah_get_sl(ah_attr) & 7) << 13; + mah->av.eth.vlan = cpu_to_be16(vlan_tag); + + return ah; +} + +int mlx4_ib_query_ah(struct ib_ah *ibah, struct rdma_ah_attr *ah_attr) +{ + struct mlx4_ib_ah *ah = to_mah(ibah); + int port_num = be32_to_cpu(ah->av.ib.port_pd) >> 24; + + memset(ah_attr, 0, sizeof *ah_attr); + ah_attr->type = ibah->type; + + if (ah_attr->type == RDMA_AH_ATTR_TYPE_ROCE) { + rdma_ah_set_dlid(ah_attr, 0); + rdma_ah_set_sl(ah_attr, + be32_to_cpu(ah->av.eth.sl_tclass_flowlabel) + >> 29); + } else { + rdma_ah_set_dlid(ah_attr, be16_to_cpu(ah->av.ib.dlid)); + rdma_ah_set_sl(ah_attr, + be32_to_cpu(ah->av.ib.sl_tclass_flowlabel) + >> 28); + } + + rdma_ah_set_port_num(ah_attr, port_num); + if (ah->av.ib.stat_rate) + rdma_ah_set_static_rate(ah_attr, + ah->av.ib.stat_rate - + MLX4_STAT_RATE_OFFSET); + rdma_ah_set_path_bits(ah_attr, ah->av.ib.g_slid & 0x7F); + if (mlx4_ib_ah_grh_present(ah)) { + u32 tc_fl = be32_to_cpu(ah->av.ib.sl_tclass_flowlabel); + + rdma_ah_set_grh(ah_attr, NULL, + tc_fl & 0xfffff, ah->av.ib.gid_index, + ah->av.ib.hop_limit, + tc_fl >> 20); + rdma_ah_set_dgid_raw(ah_attr, ah->av.ib.dgid); + } + + return 0; +} + +int mlx4_ib_destroy_ah(struct ib_ah *ah) +{ + kfree(to_mah(ah)); + return 0; +} |