IB/uverbs: Support for query QP from userspace
Dotan Barak [Tue, 14 Feb 2006 00:31:25 +0000 (16:31 -0800)]
Add support to uverbs to handle querying userspace QPs (queue pairs),
including adding an ABI for marshalling requests and responses.  The
kernel midlayer already has the underlying ib_query_qp() function.

Signed-off-by: Dotan Barak <dotanb@mellanox.co.il>
Signed-off-by: Roland Dreier <rolandd@cisco.com>

drivers/infiniband/core/uverbs.h
drivers/infiniband/core/uverbs_cmd.c
drivers/infiniband/core/uverbs_main.c
include/rdma/ib_user_verbs.h

index 3207239..89c798e 100644 (file)
@@ -183,6 +183,7 @@ IB_UVERBS_DECLARE_CMD(poll_cq);
 IB_UVERBS_DECLARE_CMD(req_notify_cq);
 IB_UVERBS_DECLARE_CMD(destroy_cq);
 IB_UVERBS_DECLARE_CMD(create_qp);
+IB_UVERBS_DECLARE_CMD(query_qp);
 IB_UVERBS_DECLARE_CMD(modify_qp);
 IB_UVERBS_DECLARE_CMD(destroy_qp);
 IB_UVERBS_DECLARE_CMD(post_send);
index 398c125..4cbef8c 100644 (file)
@@ -996,6 +996,106 @@ err_up:
        return ret;
 }
 
+ssize_t ib_uverbs_query_qp(struct ib_uverbs_file *file,
+                          const char __user *buf, int in_len,
+                          int out_len)
+{
+       struct ib_uverbs_query_qp      cmd;
+       struct ib_uverbs_query_qp_resp resp;
+       struct ib_qp                   *qp;
+       struct ib_qp_attr              *attr;
+       struct ib_qp_init_attr         *init_attr;
+       int                            ret;
+
+       if (copy_from_user(&cmd, buf, sizeof cmd))
+               return -EFAULT;
+
+       attr      = kmalloc(sizeof *attr, GFP_KERNEL);
+       init_attr = kmalloc(sizeof *init_attr, GFP_KERNEL);
+       if (!attr || !init_attr) {
+               ret = -ENOMEM;
+               goto out;
+       }
+
+       mutex_lock(&ib_uverbs_idr_mutex);
+
+       qp = idr_find(&ib_uverbs_qp_idr, cmd.qp_handle);
+       if (qp && qp->uobject->context == file->ucontext)
+               ret = ib_query_qp(qp, attr, cmd.attr_mask, init_attr);
+       else
+               ret = -EINVAL;
+
+       mutex_unlock(&ib_uverbs_idr_mutex);
+
+       if (ret)
+               goto out;
+
+       memset(&resp, 0, sizeof resp);
+
+       resp.qp_state               = attr->qp_state;
+       resp.cur_qp_state           = attr->cur_qp_state;
+       resp.path_mtu               = attr->path_mtu;
+       resp.path_mig_state         = attr->path_mig_state;
+       resp.qkey                   = attr->qkey;
+       resp.rq_psn                 = attr->rq_psn;
+       resp.sq_psn                 = attr->sq_psn;
+       resp.dest_qp_num            = attr->dest_qp_num;
+       resp.qp_access_flags        = attr->qp_access_flags;
+       resp.pkey_index             = attr->pkey_index;
+       resp.alt_pkey_index         = attr->alt_pkey_index;
+       resp.en_sqd_async_notify    = attr->en_sqd_async_notify;
+       resp.max_rd_atomic          = attr->max_rd_atomic;
+       resp.max_dest_rd_atomic     = attr->max_dest_rd_atomic;
+       resp.min_rnr_timer          = attr->min_rnr_timer;
+       resp.port_num               = attr->port_num;
+       resp.timeout                = attr->timeout;
+       resp.retry_cnt              = attr->retry_cnt;
+       resp.rnr_retry              = attr->rnr_retry;
+       resp.alt_port_num           = attr->alt_port_num;
+       resp.alt_timeout            = attr->alt_timeout;
+
+       memcpy(resp.dest.dgid, attr->ah_attr.grh.dgid.raw, 16);
+       resp.dest.flow_label        = attr->ah_attr.grh.flow_label;
+       resp.dest.sgid_index        = attr->ah_attr.grh.sgid_index;
+       resp.dest.hop_limit         = attr->ah_attr.grh.hop_limit;
+       resp.dest.traffic_class     = attr->ah_attr.grh.traffic_class;
+       resp.dest.dlid              = attr->ah_attr.dlid;
+       resp.dest.sl                = attr->ah_attr.sl;
+       resp.dest.src_path_bits     = attr->ah_attr.src_path_bits;
+       resp.dest.static_rate       = attr->ah_attr.static_rate;
+       resp.dest.is_global         = !!(attr->ah_attr.ah_flags & IB_AH_GRH);
+       resp.dest.port_num          = attr->ah_attr.port_num;
+
+       memcpy(resp.alt_dest.dgid, attr->alt_ah_attr.grh.dgid.raw, 16);
+       resp.alt_dest.flow_label    = attr->alt_ah_attr.grh.flow_label;
+       resp.alt_dest.sgid_index    = attr->alt_ah_attr.grh.sgid_index;
+       resp.alt_dest.hop_limit     = attr->alt_ah_attr.grh.hop_limit;
+       resp.alt_dest.traffic_class = attr->alt_ah_attr.grh.traffic_class;
+       resp.alt_dest.dlid          = attr->alt_ah_attr.dlid;
+       resp.alt_dest.sl            = attr->alt_ah_attr.sl;
+       resp.alt_dest.src_path_bits = attr->alt_ah_attr.src_path_bits;
+       resp.alt_dest.static_rate   = attr->alt_ah_attr.static_rate;
+       resp.alt_dest.is_global     = !!(attr->alt_ah_attr.ah_flags & IB_AH_GRH);
+       resp.alt_dest.port_num      = attr->alt_ah_attr.port_num;
+
+       resp.max_send_wr            = init_attr->cap.max_send_wr;
+       resp.max_recv_wr            = init_attr->cap.max_recv_wr;
+       resp.max_send_sge           = init_attr->cap.max_send_sge;
+       resp.max_recv_sge           = init_attr->cap.max_recv_sge;
+       resp.max_inline_data        = init_attr->cap.max_inline_data;
+       resp.sq_sig_all             = !!init_attr->sq_sig_type;
+
+       if (copy_to_user((void __user *) (unsigned long) cmd.response,
+                        &resp, sizeof resp))
+               ret = -EFAULT;
+
+out:
+       kfree(attr);
+       kfree(init_attr);
+
+       return ret ? ret : in_len;
+}
+
 ssize_t ib_uverbs_modify_qp(struct ib_uverbs_file *file,
                            const char __user *buf, int in_len,
                            int out_len)
index 335b693..91e4750 100644 (file)
@@ -96,6 +96,7 @@ static ssize_t (*uverbs_cmd_table[])(struct ib_uverbs_file *file,
        [IB_USER_VERBS_CMD_REQ_NOTIFY_CQ]       = ib_uverbs_req_notify_cq,
        [IB_USER_VERBS_CMD_DESTROY_CQ]          = ib_uverbs_destroy_cq,
        [IB_USER_VERBS_CMD_CREATE_QP]           = ib_uverbs_create_qp,
+       [IB_USER_VERBS_CMD_QUERY_QP]            = ib_uverbs_query_qp,
        [IB_USER_VERBS_CMD_MODIFY_QP]           = ib_uverbs_modify_qp,
        [IB_USER_VERBS_CMD_DESTROY_QP]          = ib_uverbs_destroy_qp,
        [IB_USER_VERBS_CMD_POST_SEND]           = ib_uverbs_post_send,
index fb94c08..58662c3 100644 (file)
@@ -370,6 +370,47 @@ struct ib_uverbs_qp_dest {
        __u8  port_num;
 };
 
+struct ib_uverbs_query_qp {
+       __u64 response;
+       __u32 qp_handle;
+       __u32 attr_mask;
+       __u64 driver_data[0];
+};
+
+struct ib_uverbs_query_qp_resp {
+       struct ib_uverbs_qp_dest dest;
+       struct ib_uverbs_qp_dest alt_dest;
+       __u32 max_send_wr;
+       __u32 max_recv_wr;
+       __u32 max_send_sge;
+       __u32 max_recv_sge;
+       __u32 max_inline_data;
+       __u32 qkey;
+       __u32 rq_psn;
+       __u32 sq_psn;
+       __u32 dest_qp_num;
+       __u32 qp_access_flags;
+       __u16 pkey_index;
+       __u16 alt_pkey_index;
+       __u8  qp_state;
+       __u8  cur_qp_state;
+       __u8  path_mtu;
+       __u8  path_mig_state;
+       __u8  en_sqd_async_notify;
+       __u8  max_rd_atomic;
+       __u8  max_dest_rd_atomic;
+       __u8  min_rnr_timer;
+       __u8  port_num;
+       __u8  timeout;
+       __u8  retry_cnt;
+       __u8  rnr_retry;
+       __u8  alt_port_num;
+       __u8  alt_timeout;
+       __u8  sq_sig_all;
+       __u8  reserved[5];
+       __u64 driver_data[0];
+};
+
 struct ib_uverbs_modify_qp {
        struct ib_uverbs_qp_dest dest;
        struct ib_uverbs_qp_dest alt_dest;