From: Parav Pandit <parav@xxxxxxxxxxxx>
The work completion is inspected to determine what dgid table entry was
used to receieve the packet, produces a sgid_attr that matches and
sticks it in the ah_attr.
All callers of this function are now required to release the ah_attr on
success.
Signed-off-by: Parav Pandit <parav@xxxxxxxxxxxx>
Signed-off-by: Jason Gunthorpe <jgg@xxxxxxxxxxxx>
Signed-off-by: Leon Romanovsky <leonro@xxxxxxxxxxxx>
---
drivers/infiniband/core/cm.c | 3 +
drivers/infiniband/core/user_mad.c | 1 +
drivers/infiniband/core/verbs.c | 110 +++++++++++++++++++------------------
include/rdma/ib_verbs.h | 7 +++
4 files changed, 67 insertions(+), 54 deletions(-)
diff --git a/drivers/infiniband/core/cm.c b/drivers/infiniband/core/cm.c
index 0f39a879c91d..11b85933fb39 100644
--- a/drivers/infiniband/core/cm.c
+++ b/drivers/infiniband/core/cm.c
@@ -1091,6 +1091,9 @@ static void cm_destroy_id(struct ib_cm_id *cm_id, int err)
wait_for_completion(&cm_id_priv->comp);
while ((work = cm_dequeue_work(cm_id_priv)) != NULL)
cm_free_work(work);
+
+ rdma_destroy_ah_attr(&cm_id_priv->av.ah_attr);
+ rdma_destroy_ah_attr(&cm_id_priv->alt_av.ah_attr);
kfree(cm_id_priv->private_data);
kfree(cm_id_priv);
}
diff --git a/drivers/infiniband/core/user_mad.c b/drivers/infiniband/core/user_mad.c
index bb98c9e4a7fd..c34a6852d691 100644
--- a/drivers/infiniband/core/user_mad.c
+++ b/drivers/infiniband/core/user_mad.c
@@ -268,6 +268,7 @@ static void recv_handler(struct ib_mad_agent *agent,
packet->mad.hdr.traffic_class = grh->traffic_class;
memcpy(packet->mad.hdr.gid, &grh->dgid, 16);
packet->mad.hdr.flow_label = cpu_to_be32(grh->flow_label);
+ rdma_destroy_ah_attr(&ah_attr);
}
if (queue_packet(file, agent, packet))
diff --git a/drivers/infiniband/core/verbs.c b/drivers/infiniband/core/verbs.c
index b0ad739a7bd0..9a72b88fea80 100644
--- a/drivers/infiniband/core/verbs.c
+++ b/drivers/infiniband/core/verbs.c
@@ -636,16 +636,16 @@ static bool find_gid_index(const union ib_gid *gid,
return true;
}
-static int get_sgid_index_from_eth(struct ib_device *device, u8 port_num,
- u16 vlan_id, const union ib_gid *sgid,
- enum ib_gid_type gid_type,
- u16 *gid_index)
+static const struct ib_gid_attr *
+get_sgid_attr_from_eth(struct ib_device *device, u8 port_num,
+ u16 vlan_id, const union ib_gid *sgid,
+ enum ib_gid_type gid_type)
{
struct find_gid_index_context context = {.vlan_id = vlan_id,
.gid_type = gid_type};
- return ib_find_gid_by_filter(device, sgid, port_num, find_gid_index,
- &context, gid_index);
+ return rdma_find_gid_by_filter(device, sgid, port_num, find_gid_index,
+ &context);
}
int ib_get_gids_from_rdma_hdr(const union rdma_network_hdr *hdr,
@@ -689,37 +689,24 @@ EXPORT_SYMBOL(ib_get_gids_from_rdma_hdr);
static int ib_resolve_unicast_gid_dmac(struct ib_device *device,
struct rdma_ah_attr *ah_attr)
{
- struct ib_gid_attr sgid_attr;
- struct ib_global_route *grh;
+ struct ib_global_route *grh = rdma_ah_retrieve_grh(ah_attr);
+ const struct ib_gid_attr *sgid_attr = grh->sgid_attr;
int hop_limit = 0xff;
- union ib_gid sgid;
- int ret;
-
- grh = rdma_ah_retrieve_grh(ah_attr);
-
- ret = ib_get_cached_gid(device, rdma_ah_get_port_num(ah_attr),
- grh->sgid_index, &sgid, &sgid_attr);
- if (ret || !sgid_attr.ndev) {
- if (!ret)
- ret = -ENXIO;
- return ret;
- }
+ int ret = 0;
/* If destination is link local and source GID is RoCEv1,
* IP stack is not used.
*/
if (rdma_link_local_addr((struct in6_addr *)grh->dgid.raw) &&
- sgid_attr.gid_type == IB_GID_TYPE_ROCE) {
+ sgid_attr->gid_type == IB_GID_TYPE_ROCE) {
rdma_get_ll_mac((struct in6_addr *)grh->dgid.raw,
ah_attr->roce.dmac);
- goto done;
+ return ret;
}
- ret = rdma_addr_find_l2_eth_by_grh(&sgid, &grh->dgid,
+ ret = rdma_addr_find_l2_eth_by_grh(&sgid_attr->gid, &grh->dgid,
ah_attr->roce.dmac,
- sgid_attr.ndev, &hop_limit);
-done:
- dev_put(sgid_attr.ndev);
+ sgid_attr->ndev, &hop_limit);
grh->hop_limit = hop_limit;
return ret;
@@ -734,16 +721,18 @@ static int ib_resolve_unicast_gid_dmac(struct ib_device *device,
* as sgid and, sgid is used as dgid because sgid contains destinations
* GID whom to respond to.
*
+ * On success the caller is responsible to call rdma_destroy_ah_attr on the
+ * attr.
*/
int ib_init_ah_attr_from_wc(struct ib_device *device, u8 port_num,
const struct ib_wc *wc, const struct ib_grh *grh,
struct rdma_ah_attr *ah_attr)
{
u32 flow_class;
- u16 gid_index;
int ret;
enum rdma_network_type net_type = RDMA_NETWORK_IB;
enum ib_gid_type gid_type = IB_GID_TYPE_IB;
+ const struct ib_gid_attr *sgid_attr;
int hoplimit = 0xff;
union ib_gid dgid;
union ib_gid sgid;
@@ -774,40 +763,49 @@ int ib_init_ah_attr_from_wc(struct ib_device *device, u8 port_num,
if (!(wc->wc_flags & IB_WC_GRH))
return -EPROTOTYPE;
- ret = get_sgid_index_from_eth(device, port_num,
- vlan_id, &dgid,
- gid_type, &gid_index);
- if (ret)
- return ret;
+ sgid_attr = get_sgid_attr_from_eth(device, port_num,
+ vlan_id, &dgid,
+ gid_type);
+ if (IS_ERR(sgid_attr))
+ return PTR_ERR(sgid_attr);
flow_class = be32_to_cpu(grh->version_tclass_flow);
- rdma_ah_set_grh(ah_attr, &sgid,
- flow_class & 0xFFFFF,
- (u8)gid_index, hoplimit,
- (flow_class >> 20) & 0xFF);
- return ib_resolve_unicast_gid_dmac(device, ah_attr);
+ rdma_move_grh_sgid_attr(ah_attr,
+ &sgid,
+ flow_class & 0xFFFFF,
+ hoplimit,
+ (flow_class >> 20) & 0xFF,
+ sgid_attr);
+
+ ret = ib_resolve_unicast_gid_dmac(device, ah_attr);
+ if (ret)
+ rdma_destroy_ah_attr(ah_attr);
+
+ return ret;
} else {
rdma_ah_set_dlid(ah_attr, wc->slid);
rdma_ah_set_path_bits(ah_attr, wc->dlid_path_bits);
- if (wc->wc_flags & IB_WC_GRH) {
- if (dgid.global.interface_id != cpu_to_be64(IB_SA_WELL_KNOWN_GUID)) {
- ret = ib_find_cached_gid_by_port(device, &dgid,
- IB_GID_TYPE_IB,
- port_num, NULL,
- &gid_index);
- if (ret)
- return ret;
- } else {
- gid_index = 0;
- }
+ if ((wc->wc_flags & IB_WC_GRH) == 0)
+ return 0;
- flow_class = be32_to_cpu(grh->version_tclass_flow);
- rdma_ah_set_grh(ah_attr, &sgid,
+ if (dgid.global.interface_id !=
+ cpu_to_be64(IB_SA_WELL_KNOWN_GUID)) {
+ sgid_attr = rdma_find_gid_by_port(
+ device, &dgid, IB_GID_TYPE_IB, port_num, NULL);
+ } else
+ sgid_attr = rdma_get_gid_attr(device, port_num, 0);
+
+ if (IS_ERR(sgid_attr))
+ return PTR_ERR(sgid_attr);
+ flow_class = be32_to_cpu(grh->version_tclass_flow);
+ rdma_move_grh_sgid_attr(ah_attr,
+ &sgid,
flow_class & 0xFFFFF,
- (u8)gid_index, hoplimit,
- (flow_class >> 20) & 0xFF);
- }
+ hoplimit,
+ (flow_class >> 20) & 0xFF,
+ sgid_attr);
+
return 0;
}
}
@@ -860,13 +858,17 @@ struct ib_ah *ib_create_ah_from_wc(struct ib_pd *pd, const struct ib_wc *wc,
const struct ib_grh *grh, u8 port_num)
{
struct rdma_ah_attr ah_attr;
+ struct ib_ah *ah;
int ret;
ret = ib_init_ah_attr_from_wc(pd->device, port_num, wc, grh, &ah_attr);
if (ret)
return ERR_PTR(ret);
- return rdma_create_ah(pd, &ah_attr);
+ ah = rdma_create_ah(pd, &ah_attr);
+
+ rdma_destroy_ah_attr(&ah_attr);
+ return ah;
}
EXPORT_SYMBOL(ib_create_ah_from_wc);
diff --git a/include/rdma/ib_verbs.h b/include/rdma/ib_verbs.h
index fec99ec67f8e..f0d36cd60e57 100644
--- a/include/rdma/ib_verbs.h
+++ b/include/rdma/ib_verbs.h
@@ -3150,6 +3150,13 @@ int ib_get_rdma_header_version(const union rdma_network_hdr *hdr);
* ignored unless the work completion indicates that the GRH is valid.
* @ah_attr: Returned attributes that can be used when creating an address
* handle for replying to the message.
+ * When ib_init_ah_attr_from_wc() returns success,
+ * (a) for IB link layer it optionally contains a reference to SGID attribute
+ * when GRH is present for IB link layer.
+ * (b) for RoCE link layer it contains a reference to SGID attribute.
+ * User must invoke rdma_cleanup_ah_attr_gid_attr() to release reference to SGID
+ * attributes which are initialized using ib_init_ah_attr_from_wc().
+ *
*/
int ib_init_ah_attr_from_wc(struct ib_device *device, u8 port_num,
const struct ib_wc *wc, const struct ib_grh *grh,
--
2.14.4
--
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