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path: root/drivers/infiniband/core/uverbs_cmd.c
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Diffstat (limited to 'drivers/infiniband/core/uverbs_cmd.c')
-rw-r--r--drivers/infiniband/core/uverbs_cmd.c23
1 files changed, 22 insertions, 1 deletions
diff --git a/drivers/infiniband/core/uverbs_cmd.c b/drivers/infiniband/core/uverbs_cmd.c
index d048cabc4246..1bc9ceb16b70 100644
--- a/drivers/infiniband/core/uverbs_cmd.c
+++ b/drivers/infiniband/core/uverbs_cmd.c
@@ -241,6 +241,27 @@ ssize_t ib_uverbs_query_device(struct ib_uverbs_file *file,
return in_len;
}
+/*
+ * ib_uverbs_query_port_resp.port_cap_flags started out as just a copy of the
+ * PortInfo CapabilityMask, but was extended with unique bits.
+ */
+static u32 make_port_cap_flags(const struct ib_port_attr *attr)
+{
+ u32 res;
+
+ /* All IBA CapabilityMask bits are passed through here, except bit 26,
+ * which is overridden with IP_BASED_GIDS. This is due to a historical
+ * mistake in the implementation of IP_BASED_GIDS. Otherwise all other
+ * bits match the IBA definition across all kernel versions.
+ */
+ res = attr->port_cap_flags & ~(u32)IB_UVERBS_PCF_IP_BASED_GIDS;
+
+ if (attr->ip_gids)
+ res |= IB_UVERBS_PCF_IP_BASED_GIDS;
+
+ return res;
+}
+
ssize_t ib_uverbs_query_port(struct ib_uverbs_file *file,
struct ib_device *ib_dev,
const char __user *buf,
@@ -267,7 +288,7 @@ ssize_t ib_uverbs_query_port(struct ib_uverbs_file *file,
resp.max_mtu = attr.max_mtu;
resp.active_mtu = attr.active_mtu;
resp.gid_tbl_len = attr.gid_tbl_len;
- resp.port_cap_flags = attr.port_cap_flags;
+ resp.port_cap_flags = make_port_cap_flags(&attr);
resp.max_msg_sz = attr.max_msg_sz;
resp.bad_pkey_cntr = attr.bad_pkey_cntr;
resp.qkey_viol_cntr = attr.qkey_viol_cntr;