This patch enables posting Verb requests and receiving responses to/from the backend PVRDMA emulation layer.
Reviewed-by: Yuval Shaia <yuval.sh...@oracle.com> Reviewed-by: Jorgen Hansen <jhan...@vmware.com> Reviewed-by: George Zhang <georgezh...@vmware.com> Reviewed-by: Aditya Sarwade <asarw...@vmware.com> Reviewed-by: Bryan Tan <bryan...@vmware.com> Signed-off-by: Adit Ranadive <ad...@vmware.com> --- Changes v4->v5: - Moved the timeout to pvrdma_cmd_recv. - Added additional response code parameter to pvrdma_cmd_post. Changes v3->v4: - Removed the min check and added a BUILD_BUG_ON check for size. Changes v2->v3: - Converted pvrdma_cmd_recv to inline. - Added a min check in the memcpy to cmd_slot. - Removed the boolean from pvrdma_cmd_post. --- drivers/infiniband/hw/pvrdma/pvrdma_cmd.c | 117 ++++++++++++++++++++++++++++++ 1 file changed, 117 insertions(+) create mode 100644 drivers/infiniband/hw/pvrdma/pvrdma_cmd.c diff --git a/drivers/infiniband/hw/pvrdma/pvrdma_cmd.c b/drivers/infiniband/hw/pvrdma/pvrdma_cmd.c new file mode 100644 index 0000000..21f1af8 --- /dev/null +++ b/drivers/infiniband/hw/pvrdma/pvrdma_cmd.c @@ -0,0 +1,117 @@ +/* + * Copyright (c) 2012-2016 VMware, Inc. All rights reserved. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of EITHER the GNU General Public License + * version 2 as published by the Free Software Foundation or the BSD + * 2-Clause License. This program is distributed in the hope that it + * will be useful, but WITHOUT ANY WARRANTY; WITHOUT EVEN THE IMPLIED + * WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. + * See the GNU General Public License version 2 for more details at + * http://www.gnu.org/licenses/old-licenses/gpl-2.0.en.html. + * + * You should have received a copy of the GNU General Public License + * along with this program available in the file COPYING in the main + * directory of this source tree. + * + * The BSD 2-Clause License + * + * 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. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS + * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE + * COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, + * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES + * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR + * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, + * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) + * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED + * OF THE POSSIBILITY OF SUCH DAMAGE. + */ + +#include <linux/list.h> + +#include "pvrdma.h" + +#define PVRDMA_CMD_TIMEOUT 10000 /* ms */ + +static inline int pvrdma_cmd_recv(struct pvrdma_dev *dev, + union pvrdma_cmd_resp *resp, + unsigned resp_code) +{ + int err; + + dev_dbg(&dev->pdev->dev, "receive response from device\n"); + + err = wait_for_completion_interruptible_timeout(&dev->cmd_done, + msecs_to_jiffies(PVRDMA_CMD_TIMEOUT)); + if (err == 0 || err == -ERESTARTSYS) { + dev_warn(&dev->pdev->dev, + "completion timeout or interrupted\n"); + return -ETIMEDOUT; + } + + spin_lock(&dev->cmd_lock); + memcpy(resp, dev->resp_slot, sizeof(*resp)); + spin_unlock(&dev->cmd_lock); + + if (resp->hdr.ack != resp_code) { + dev_warn(&dev->pdev->dev, + "unknown response %#x expected %#x\n", + resp->hdr.ack, resp_code); + return -EFAULT; + } + + return 0; +} + +int +pvrdma_cmd_post(struct pvrdma_dev *dev, union pvrdma_cmd_req *req, + union pvrdma_cmd_resp *resp, unsigned resp_code) +{ + int err; + + dev_dbg(&dev->pdev->dev, "post request to device\n"); + + /* Serializiation */ + down(&dev->cmd_sema); + + BUILD_BUG_ON(sizeof(union pvrdma_cmd_req) != + sizeof(struct pvrdma_cmd_modify_qp)); + + spin_lock(&dev->cmd_lock); + memcpy(dev->cmd_slot, req, sizeof(*req)); + spin_unlock(&dev->cmd_lock); + + init_completion(&dev->cmd_done); + pvrdma_write_reg(dev, PVRDMA_REG_REQUEST, 0); + + /* Make sure the request is written before reading status. */ + mb(); + + err = pvrdma_read_reg(dev, PVRDMA_REG_ERR); + if (err == 0) { + if (resp != NULL) + err = pvrdma_cmd_recv(dev, resp, resp_code); + } else { + dev_warn(&dev->pdev->dev, "failed to write request %d\n", err); + } + + up(&dev->cmd_sema); + + return err; +} -- 2.7.4
