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![Moni Shoua](/assets/img/avatar_default.png)
Soft RoCE (RXE) - The software RoCE driver ib_rxe implements the RDMA transport and registers to the RDMA core device as a kernel verbs provider. It also implements the packet IO layer. On the other hand ib_rxe registers to the Linux netdev stack as a udp encapsulating protocol, in that case RDMA, for sending and receiving packets over any Ethernet device. This yields a RDMA transport over the UDP/Ethernet network layer forming a RoCEv2 compatible device. The configuration procedure of the Soft RoCE drivers requires binding to any existing Ethernet network device. This is done with /sys interface. A userspace Soft RoCE library (librxe) provides user applications the ability to run with Soft RoCE devices. The use of rxe verbs ins user space requires the inclusion of librxe as a device specifics plug-in to libibverbs. librxe is packaged separately. Architecture: +-----------------------------------------------------------+ | Application | +-----------------------------------------------------------+ +-----------------------------------+ | libibverbs | User +-----------------------------------+ +----------------+ +----------------+ | librxe | | HW RoCE lib | +----------------+ +----------------+ +---------------------------------------------------------------+ +--------------+ +------------+ | Sockets | | RDMA ULP | +--------------+ +------------+ +--------------+ +---------------------+ | TCP/IP | | ib_core | +--------------+ +---------------------+ +------------+ +----------------+ Kernel | ib_rxe | | HW RoCE driver | +------------+ +----------------+ +------------------------------------+ | NIC driver | +------------------------------------+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ +-----------------------------------------------------------+ | Application | +-----------------------------------------------------------+ +-----------------------------------+ | libibverbs | User +-----------------------------------+ +----------------+ +----------------+ | librxe | | HW RoCE lib | +----------------+ +----------------+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ +--------------+ +------------+ | Sockets | | RDMA ULP | +--------------+ +------------+ +--------------+ +---------------------+ | TCP/IP | | ib_core | +--------------+ +---------------------+ +------------+ +----------------+ Kernel | ib_rxe | | HW RoCE driver | +------------+ +----------------+ +------------------------------------+ | NIC driver | +------------------------------------+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Soft RoCE resources: [1[ https://github.com/SoftRoCE/librxe-dev librxe - source code in Github [2] https://github.com/SoftRoCE/rxe-dev/wiki/rxe-dev:-Home - Soft RoCE Wiki page [3] https://github.com/SoftRoCE/librxe-dev - Soft RoCE userspace library Signed-off-by: Kamal Heib <kamalh@mellanox.com> Signed-off-by: Amir Vadai <amirv@mellanox.com> Signed-off-by: Moni Shoua <monis@mellanox.com> Reviewed-by: Haggai Eran <haggaie@mellanox.com> Signed-off-by: Doug Ledford <dledford@redhat.com>
1380 lines
32 KiB
C
1380 lines
32 KiB
C
/*
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* Copyright (c) 2016 Mellanox Technologies Ltd. All rights reserved.
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* Copyright (c) 2015 System Fabric Works, Inc. All rights reserved.
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*
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* This software is available to you under a choice of one of two
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* licenses. You may choose to be licensed under the terms of the GNU
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* General Public License (GPL) Version 2, available from the file
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* COPYING in the main directory of this source tree, or the
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* OpenIB.org BSD license below:
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*
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* Redistribution and use in source and binary forms, with or
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* without modification, are permitted provided that the following
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* conditions are met:
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*
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* - Redistributions of source code must retain the above
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* copyright notice, this list of conditions and the following
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* disclaimer.
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*
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* - Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following
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* disclaimer in the documentation and/or other materials
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* provided with the distribution.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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#include <linux/skbuff.h>
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#include "rxe.h"
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#include "rxe_loc.h"
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#include "rxe_queue.h"
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enum resp_states {
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RESPST_NONE,
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RESPST_GET_REQ,
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RESPST_CHK_PSN,
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RESPST_CHK_OP_SEQ,
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RESPST_CHK_OP_VALID,
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RESPST_CHK_RESOURCE,
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RESPST_CHK_LENGTH,
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RESPST_CHK_RKEY,
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RESPST_EXECUTE,
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RESPST_READ_REPLY,
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RESPST_COMPLETE,
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RESPST_ACKNOWLEDGE,
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RESPST_CLEANUP,
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RESPST_DUPLICATE_REQUEST,
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RESPST_ERR_MALFORMED_WQE,
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RESPST_ERR_UNSUPPORTED_OPCODE,
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RESPST_ERR_MISALIGNED_ATOMIC,
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RESPST_ERR_PSN_OUT_OF_SEQ,
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RESPST_ERR_MISSING_OPCODE_FIRST,
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RESPST_ERR_MISSING_OPCODE_LAST_C,
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RESPST_ERR_MISSING_OPCODE_LAST_D1E,
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RESPST_ERR_TOO_MANY_RDMA_ATM_REQ,
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RESPST_ERR_RNR,
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RESPST_ERR_RKEY_VIOLATION,
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RESPST_ERR_LENGTH,
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RESPST_ERR_CQ_OVERFLOW,
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RESPST_ERROR,
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RESPST_RESET,
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RESPST_DONE,
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RESPST_EXIT,
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};
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static char *resp_state_name[] = {
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[RESPST_NONE] = "NONE",
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[RESPST_GET_REQ] = "GET_REQ",
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[RESPST_CHK_PSN] = "CHK_PSN",
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[RESPST_CHK_OP_SEQ] = "CHK_OP_SEQ",
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[RESPST_CHK_OP_VALID] = "CHK_OP_VALID",
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[RESPST_CHK_RESOURCE] = "CHK_RESOURCE",
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[RESPST_CHK_LENGTH] = "CHK_LENGTH",
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[RESPST_CHK_RKEY] = "CHK_RKEY",
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[RESPST_EXECUTE] = "EXECUTE",
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[RESPST_READ_REPLY] = "READ_REPLY",
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[RESPST_COMPLETE] = "COMPLETE",
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[RESPST_ACKNOWLEDGE] = "ACKNOWLEDGE",
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[RESPST_CLEANUP] = "CLEANUP",
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[RESPST_DUPLICATE_REQUEST] = "DUPLICATE_REQUEST",
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[RESPST_ERR_MALFORMED_WQE] = "ERR_MALFORMED_WQE",
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[RESPST_ERR_UNSUPPORTED_OPCODE] = "ERR_UNSUPPORTED_OPCODE",
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[RESPST_ERR_MISALIGNED_ATOMIC] = "ERR_MISALIGNED_ATOMIC",
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[RESPST_ERR_PSN_OUT_OF_SEQ] = "ERR_PSN_OUT_OF_SEQ",
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[RESPST_ERR_MISSING_OPCODE_FIRST] = "ERR_MISSING_OPCODE_FIRST",
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[RESPST_ERR_MISSING_OPCODE_LAST_C] = "ERR_MISSING_OPCODE_LAST_C",
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[RESPST_ERR_MISSING_OPCODE_LAST_D1E] = "ERR_MISSING_OPCODE_LAST_D1E",
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[RESPST_ERR_TOO_MANY_RDMA_ATM_REQ] = "ERR_TOO_MANY_RDMA_ATM_REQ",
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[RESPST_ERR_RNR] = "ERR_RNR",
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[RESPST_ERR_RKEY_VIOLATION] = "ERR_RKEY_VIOLATION",
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[RESPST_ERR_LENGTH] = "ERR_LENGTH",
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[RESPST_ERR_CQ_OVERFLOW] = "ERR_CQ_OVERFLOW",
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[RESPST_ERROR] = "ERROR",
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[RESPST_RESET] = "RESET",
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[RESPST_DONE] = "DONE",
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[RESPST_EXIT] = "EXIT",
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};
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/* rxe_recv calls here to add a request packet to the input queue */
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void rxe_resp_queue_pkt(struct rxe_dev *rxe, struct rxe_qp *qp,
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struct sk_buff *skb)
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{
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int must_sched;
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struct rxe_pkt_info *pkt = SKB_TO_PKT(skb);
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skb_queue_tail(&qp->req_pkts, skb);
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must_sched = (pkt->opcode == IB_OPCODE_RC_RDMA_READ_REQUEST) ||
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(skb_queue_len(&qp->req_pkts) > 1);
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rxe_run_task(&qp->resp.task, must_sched);
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}
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static inline enum resp_states get_req(struct rxe_qp *qp,
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struct rxe_pkt_info **pkt_p)
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{
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struct sk_buff *skb;
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if (qp->resp.state == QP_STATE_ERROR) {
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skb = skb_dequeue(&qp->req_pkts);
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if (skb) {
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/* drain request packet queue */
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rxe_drop_ref(qp);
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kfree_skb(skb);
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return RESPST_GET_REQ;
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}
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/* go drain recv wr queue */
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return RESPST_CHK_RESOURCE;
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}
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skb = skb_peek(&qp->req_pkts);
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if (!skb)
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return RESPST_EXIT;
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*pkt_p = SKB_TO_PKT(skb);
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return (qp->resp.res) ? RESPST_READ_REPLY : RESPST_CHK_PSN;
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}
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static enum resp_states check_psn(struct rxe_qp *qp,
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struct rxe_pkt_info *pkt)
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{
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int diff = psn_compare(pkt->psn, qp->resp.psn);
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switch (qp_type(qp)) {
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case IB_QPT_RC:
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if (diff > 0) {
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if (qp->resp.sent_psn_nak)
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return RESPST_CLEANUP;
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qp->resp.sent_psn_nak = 1;
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return RESPST_ERR_PSN_OUT_OF_SEQ;
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} else if (diff < 0) {
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return RESPST_DUPLICATE_REQUEST;
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}
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if (qp->resp.sent_psn_nak)
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qp->resp.sent_psn_nak = 0;
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break;
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case IB_QPT_UC:
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if (qp->resp.drop_msg || diff != 0) {
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if (pkt->mask & RXE_START_MASK) {
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qp->resp.drop_msg = 0;
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return RESPST_CHK_OP_SEQ;
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}
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qp->resp.drop_msg = 1;
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return RESPST_CLEANUP;
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}
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break;
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default:
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break;
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}
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return RESPST_CHK_OP_SEQ;
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}
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static enum resp_states check_op_seq(struct rxe_qp *qp,
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struct rxe_pkt_info *pkt)
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{
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switch (qp_type(qp)) {
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case IB_QPT_RC:
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switch (qp->resp.opcode) {
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case IB_OPCODE_RC_SEND_FIRST:
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case IB_OPCODE_RC_SEND_MIDDLE:
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switch (pkt->opcode) {
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case IB_OPCODE_RC_SEND_MIDDLE:
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case IB_OPCODE_RC_SEND_LAST:
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case IB_OPCODE_RC_SEND_LAST_WITH_IMMEDIATE:
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case IB_OPCODE_RC_SEND_LAST_WITH_INVALIDATE:
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return RESPST_CHK_OP_VALID;
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default:
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return RESPST_ERR_MISSING_OPCODE_LAST_C;
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}
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case IB_OPCODE_RC_RDMA_WRITE_FIRST:
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case IB_OPCODE_RC_RDMA_WRITE_MIDDLE:
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switch (pkt->opcode) {
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case IB_OPCODE_RC_RDMA_WRITE_MIDDLE:
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case IB_OPCODE_RC_RDMA_WRITE_LAST:
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case IB_OPCODE_RC_RDMA_WRITE_LAST_WITH_IMMEDIATE:
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return RESPST_CHK_OP_VALID;
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default:
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return RESPST_ERR_MISSING_OPCODE_LAST_C;
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}
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default:
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switch (pkt->opcode) {
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case IB_OPCODE_RC_SEND_MIDDLE:
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case IB_OPCODE_RC_SEND_LAST:
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case IB_OPCODE_RC_SEND_LAST_WITH_IMMEDIATE:
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case IB_OPCODE_RC_SEND_LAST_WITH_INVALIDATE:
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case IB_OPCODE_RC_RDMA_WRITE_MIDDLE:
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case IB_OPCODE_RC_RDMA_WRITE_LAST:
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case IB_OPCODE_RC_RDMA_WRITE_LAST_WITH_IMMEDIATE:
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return RESPST_ERR_MISSING_OPCODE_FIRST;
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default:
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return RESPST_CHK_OP_VALID;
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}
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}
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break;
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case IB_QPT_UC:
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switch (qp->resp.opcode) {
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case IB_OPCODE_UC_SEND_FIRST:
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case IB_OPCODE_UC_SEND_MIDDLE:
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switch (pkt->opcode) {
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case IB_OPCODE_UC_SEND_MIDDLE:
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case IB_OPCODE_UC_SEND_LAST:
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case IB_OPCODE_UC_SEND_LAST_WITH_IMMEDIATE:
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return RESPST_CHK_OP_VALID;
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default:
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return RESPST_ERR_MISSING_OPCODE_LAST_D1E;
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}
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case IB_OPCODE_UC_RDMA_WRITE_FIRST:
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case IB_OPCODE_UC_RDMA_WRITE_MIDDLE:
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switch (pkt->opcode) {
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case IB_OPCODE_UC_RDMA_WRITE_MIDDLE:
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case IB_OPCODE_UC_RDMA_WRITE_LAST:
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case IB_OPCODE_UC_RDMA_WRITE_LAST_WITH_IMMEDIATE:
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return RESPST_CHK_OP_VALID;
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default:
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return RESPST_ERR_MISSING_OPCODE_LAST_D1E;
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}
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default:
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switch (pkt->opcode) {
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case IB_OPCODE_UC_SEND_MIDDLE:
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case IB_OPCODE_UC_SEND_LAST:
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case IB_OPCODE_UC_SEND_LAST_WITH_IMMEDIATE:
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case IB_OPCODE_UC_RDMA_WRITE_MIDDLE:
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case IB_OPCODE_UC_RDMA_WRITE_LAST:
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case IB_OPCODE_UC_RDMA_WRITE_LAST_WITH_IMMEDIATE:
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qp->resp.drop_msg = 1;
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return RESPST_CLEANUP;
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default:
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return RESPST_CHK_OP_VALID;
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}
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}
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break;
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default:
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return RESPST_CHK_OP_VALID;
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}
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}
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static enum resp_states check_op_valid(struct rxe_qp *qp,
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struct rxe_pkt_info *pkt)
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{
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switch (qp_type(qp)) {
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case IB_QPT_RC:
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if (((pkt->mask & RXE_READ_MASK) &&
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!(qp->attr.qp_access_flags & IB_ACCESS_REMOTE_READ)) ||
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((pkt->mask & RXE_WRITE_MASK) &&
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!(qp->attr.qp_access_flags & IB_ACCESS_REMOTE_WRITE)) ||
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((pkt->mask & RXE_ATOMIC_MASK) &&
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!(qp->attr.qp_access_flags & IB_ACCESS_REMOTE_ATOMIC))) {
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return RESPST_ERR_UNSUPPORTED_OPCODE;
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}
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break;
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case IB_QPT_UC:
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if ((pkt->mask & RXE_WRITE_MASK) &&
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!(qp->attr.qp_access_flags & IB_ACCESS_REMOTE_WRITE)) {
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qp->resp.drop_msg = 1;
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return RESPST_CLEANUP;
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}
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break;
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case IB_QPT_UD:
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case IB_QPT_SMI:
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case IB_QPT_GSI:
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break;
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default:
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WARN_ON(1);
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break;
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}
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return RESPST_CHK_RESOURCE;
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}
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static enum resp_states get_srq_wqe(struct rxe_qp *qp)
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{
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struct rxe_srq *srq = qp->srq;
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struct rxe_queue *q = srq->rq.queue;
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struct rxe_recv_wqe *wqe;
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struct ib_event ev;
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if (srq->error)
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return RESPST_ERR_RNR;
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spin_lock_bh(&srq->rq.consumer_lock);
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wqe = queue_head(q);
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if (!wqe) {
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spin_unlock_bh(&srq->rq.consumer_lock);
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return RESPST_ERR_RNR;
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}
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/* note kernel and user space recv wqes have same size */
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memcpy(&qp->resp.srq_wqe, wqe, sizeof(qp->resp.srq_wqe));
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qp->resp.wqe = &qp->resp.srq_wqe.wqe;
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advance_consumer(q);
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if (srq->limit && srq->ibsrq.event_handler &&
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(queue_count(q) < srq->limit)) {
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srq->limit = 0;
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goto event;
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}
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spin_unlock_bh(&srq->rq.consumer_lock);
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return RESPST_CHK_LENGTH;
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event:
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spin_unlock_bh(&srq->rq.consumer_lock);
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ev.device = qp->ibqp.device;
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ev.element.srq = qp->ibqp.srq;
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ev.event = IB_EVENT_SRQ_LIMIT_REACHED;
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srq->ibsrq.event_handler(&ev, srq->ibsrq.srq_context);
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return RESPST_CHK_LENGTH;
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}
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static enum resp_states check_resource(struct rxe_qp *qp,
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struct rxe_pkt_info *pkt)
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{
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struct rxe_srq *srq = qp->srq;
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if (qp->resp.state == QP_STATE_ERROR) {
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if (qp->resp.wqe) {
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qp->resp.status = IB_WC_WR_FLUSH_ERR;
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return RESPST_COMPLETE;
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} else if (!srq) {
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qp->resp.wqe = queue_head(qp->rq.queue);
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if (qp->resp.wqe) {
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qp->resp.status = IB_WC_WR_FLUSH_ERR;
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return RESPST_COMPLETE;
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} else {
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return RESPST_EXIT;
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}
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} else {
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return RESPST_EXIT;
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}
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}
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if (pkt->mask & RXE_READ_OR_ATOMIC) {
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/* it is the requesters job to not send
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* too many read/atomic ops, we just
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* recycle the responder resource queue
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*/
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if (likely(qp->attr.max_rd_atomic > 0))
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return RESPST_CHK_LENGTH;
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else
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return RESPST_ERR_TOO_MANY_RDMA_ATM_REQ;
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}
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if (pkt->mask & RXE_RWR_MASK) {
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if (srq)
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return get_srq_wqe(qp);
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qp->resp.wqe = queue_head(qp->rq.queue);
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return (qp->resp.wqe) ? RESPST_CHK_LENGTH : RESPST_ERR_RNR;
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}
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return RESPST_CHK_LENGTH;
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}
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static enum resp_states check_length(struct rxe_qp *qp,
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struct rxe_pkt_info *pkt)
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{
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switch (qp_type(qp)) {
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case IB_QPT_RC:
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return RESPST_CHK_RKEY;
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case IB_QPT_UC:
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return RESPST_CHK_RKEY;
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default:
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return RESPST_CHK_RKEY;
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}
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}
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static enum resp_states check_rkey(struct rxe_qp *qp,
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struct rxe_pkt_info *pkt)
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{
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struct rxe_mem *mem;
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u64 va;
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u32 rkey;
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u32 resid;
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u32 pktlen;
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int mtu = qp->mtu;
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enum resp_states state;
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int access;
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|
|
if (pkt->mask & (RXE_READ_MASK | RXE_WRITE_MASK)) {
|
|
if (pkt->mask & RXE_RETH_MASK) {
|
|
qp->resp.va = reth_va(pkt);
|
|
qp->resp.rkey = reth_rkey(pkt);
|
|
qp->resp.resid = reth_len(pkt);
|
|
}
|
|
access = (pkt->mask & RXE_READ_MASK) ? IB_ACCESS_REMOTE_READ
|
|
: IB_ACCESS_REMOTE_WRITE;
|
|
} else if (pkt->mask & RXE_ATOMIC_MASK) {
|
|
qp->resp.va = atmeth_va(pkt);
|
|
qp->resp.rkey = atmeth_rkey(pkt);
|
|
qp->resp.resid = sizeof(u64);
|
|
access = IB_ACCESS_REMOTE_ATOMIC;
|
|
} else {
|
|
return RESPST_EXECUTE;
|
|
}
|
|
|
|
va = qp->resp.va;
|
|
rkey = qp->resp.rkey;
|
|
resid = qp->resp.resid;
|
|
pktlen = payload_size(pkt);
|
|
|
|
mem = lookup_mem(qp->pd, access, rkey, lookup_remote);
|
|
if (!mem) {
|
|
state = RESPST_ERR_RKEY_VIOLATION;
|
|
goto err1;
|
|
}
|
|
|
|
if (unlikely(mem->state == RXE_MEM_STATE_FREE)) {
|
|
state = RESPST_ERR_RKEY_VIOLATION;
|
|
goto err1;
|
|
}
|
|
|
|
if (mem_check_range(mem, va, resid)) {
|
|
state = RESPST_ERR_RKEY_VIOLATION;
|
|
goto err2;
|
|
}
|
|
|
|
if (pkt->mask & RXE_WRITE_MASK) {
|
|
if (resid > mtu) {
|
|
if (pktlen != mtu || bth_pad(pkt)) {
|
|
state = RESPST_ERR_LENGTH;
|
|
goto err2;
|
|
}
|
|
|
|
resid = mtu;
|
|
} else {
|
|
if (pktlen != resid) {
|
|
state = RESPST_ERR_LENGTH;
|
|
goto err2;
|
|
}
|
|
if ((bth_pad(pkt) != (0x3 & (-resid)))) {
|
|
/* This case may not be exactly that
|
|
* but nothing else fits.
|
|
*/
|
|
state = RESPST_ERR_LENGTH;
|
|
goto err2;
|
|
}
|
|
}
|
|
}
|
|
|
|
WARN_ON(qp->resp.mr);
|
|
|
|
qp->resp.mr = mem;
|
|
return RESPST_EXECUTE;
|
|
|
|
err2:
|
|
rxe_drop_ref(mem);
|
|
err1:
|
|
return state;
|
|
}
|
|
|
|
static enum resp_states send_data_in(struct rxe_qp *qp, void *data_addr,
|
|
int data_len)
|
|
{
|
|
int err;
|
|
struct rxe_dev *rxe = to_rdev(qp->ibqp.device);
|
|
|
|
err = copy_data(rxe, qp->pd, IB_ACCESS_LOCAL_WRITE, &qp->resp.wqe->dma,
|
|
data_addr, data_len, to_mem_obj, NULL);
|
|
if (unlikely(err))
|
|
return (err == -ENOSPC) ? RESPST_ERR_LENGTH
|
|
: RESPST_ERR_MALFORMED_WQE;
|
|
|
|
return RESPST_NONE;
|
|
}
|
|
|
|
static enum resp_states write_data_in(struct rxe_qp *qp,
|
|
struct rxe_pkt_info *pkt)
|
|
{
|
|
enum resp_states rc = RESPST_NONE;
|
|
int err;
|
|
int data_len = payload_size(pkt);
|
|
|
|
err = rxe_mem_copy(qp->resp.mr, qp->resp.va, payload_addr(pkt),
|
|
data_len, to_mem_obj, NULL);
|
|
if (err) {
|
|
rc = RESPST_ERR_RKEY_VIOLATION;
|
|
goto out;
|
|
}
|
|
|
|
qp->resp.va += data_len;
|
|
qp->resp.resid -= data_len;
|
|
|
|
out:
|
|
return rc;
|
|
}
|
|
|
|
/* Guarantee atomicity of atomic operations at the machine level. */
|
|
static DEFINE_SPINLOCK(atomic_ops_lock);
|
|
|
|
static enum resp_states process_atomic(struct rxe_qp *qp,
|
|
struct rxe_pkt_info *pkt)
|
|
{
|
|
u64 iova = atmeth_va(pkt);
|
|
u64 *vaddr;
|
|
enum resp_states ret;
|
|
struct rxe_mem *mr = qp->resp.mr;
|
|
|
|
if (mr->state != RXE_MEM_STATE_VALID) {
|
|
ret = RESPST_ERR_RKEY_VIOLATION;
|
|
goto out;
|
|
}
|
|
|
|
vaddr = iova_to_vaddr(mr, iova, sizeof(u64));
|
|
|
|
/* check vaddr is 8 bytes aligned. */
|
|
if (!vaddr || (uintptr_t)vaddr & 7) {
|
|
ret = RESPST_ERR_MISALIGNED_ATOMIC;
|
|
goto out;
|
|
}
|
|
|
|
spin_lock_bh(&atomic_ops_lock);
|
|
|
|
qp->resp.atomic_orig = *vaddr;
|
|
|
|
if (pkt->opcode == IB_OPCODE_RC_COMPARE_SWAP ||
|
|
pkt->opcode == IB_OPCODE_RD_COMPARE_SWAP) {
|
|
if (*vaddr == atmeth_comp(pkt))
|
|
*vaddr = atmeth_swap_add(pkt);
|
|
} else {
|
|
*vaddr += atmeth_swap_add(pkt);
|
|
}
|
|
|
|
spin_unlock_bh(&atomic_ops_lock);
|
|
|
|
ret = RESPST_NONE;
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
static struct sk_buff *prepare_ack_packet(struct rxe_qp *qp,
|
|
struct rxe_pkt_info *pkt,
|
|
struct rxe_pkt_info *ack,
|
|
int opcode,
|
|
int payload,
|
|
u32 psn,
|
|
u8 syndrome,
|
|
u32 *crcp)
|
|
{
|
|
struct rxe_dev *rxe = to_rdev(qp->ibqp.device);
|
|
struct sk_buff *skb;
|
|
u32 crc = 0;
|
|
u32 *p;
|
|
int paylen;
|
|
int pad;
|
|
int err;
|
|
|
|
/*
|
|
* allocate packet
|
|
*/
|
|
pad = (-payload) & 0x3;
|
|
paylen = rxe_opcode[opcode].length + payload + pad + RXE_ICRC_SIZE;
|
|
|
|
skb = rxe->ifc_ops->init_packet(rxe, &qp->pri_av, paylen, ack);
|
|
if (!skb)
|
|
return NULL;
|
|
|
|
ack->qp = qp;
|
|
ack->opcode = opcode;
|
|
ack->mask = rxe_opcode[opcode].mask;
|
|
ack->offset = pkt->offset;
|
|
ack->paylen = paylen;
|
|
|
|
/* fill in bth using the request packet headers */
|
|
memcpy(ack->hdr, pkt->hdr, pkt->offset + RXE_BTH_BYTES);
|
|
|
|
bth_set_opcode(ack, opcode);
|
|
bth_set_qpn(ack, qp->attr.dest_qp_num);
|
|
bth_set_pad(ack, pad);
|
|
bth_set_se(ack, 0);
|
|
bth_set_psn(ack, psn);
|
|
bth_set_ack(ack, 0);
|
|
ack->psn = psn;
|
|
|
|
if (ack->mask & RXE_AETH_MASK) {
|
|
aeth_set_syn(ack, syndrome);
|
|
aeth_set_msn(ack, qp->resp.msn);
|
|
}
|
|
|
|
if (ack->mask & RXE_ATMACK_MASK)
|
|
atmack_set_orig(ack, qp->resp.atomic_orig);
|
|
|
|
err = rxe->ifc_ops->prepare(rxe, ack, skb, &crc);
|
|
if (err) {
|
|
kfree_skb(skb);
|
|
return NULL;
|
|
}
|
|
|
|
if (crcp) {
|
|
/* CRC computation will be continued by the caller */
|
|
*crcp = crc;
|
|
} else {
|
|
p = payload_addr(ack) + payload + bth_pad(ack);
|
|
*p = ~crc;
|
|
}
|
|
|
|
return skb;
|
|
}
|
|
|
|
/* RDMA read response. If res is not NULL, then we have a current RDMA request
|
|
* being processed or replayed.
|
|
*/
|
|
static enum resp_states read_reply(struct rxe_qp *qp,
|
|
struct rxe_pkt_info *req_pkt)
|
|
{
|
|
struct rxe_dev *rxe = to_rdev(qp->ibqp.device);
|
|
struct rxe_pkt_info ack_pkt;
|
|
struct sk_buff *skb;
|
|
int mtu = qp->mtu;
|
|
enum resp_states state;
|
|
int payload;
|
|
int opcode;
|
|
int err;
|
|
struct resp_res *res = qp->resp.res;
|
|
u32 icrc;
|
|
u32 *p;
|
|
|
|
if (!res) {
|
|
/* This is the first time we process that request. Get a
|
|
* resource
|
|
*/
|
|
res = &qp->resp.resources[qp->resp.res_head];
|
|
|
|
free_rd_atomic_resource(qp, res);
|
|
rxe_advance_resp_resource(qp);
|
|
|
|
res->type = RXE_READ_MASK;
|
|
|
|
res->read.va = qp->resp.va;
|
|
res->read.va_org = qp->resp.va;
|
|
|
|
res->first_psn = req_pkt->psn;
|
|
res->last_psn = req_pkt->psn +
|
|
(reth_len(req_pkt) + mtu - 1) /
|
|
mtu - 1;
|
|
res->cur_psn = req_pkt->psn;
|
|
|
|
res->read.resid = qp->resp.resid;
|
|
res->read.length = qp->resp.resid;
|
|
res->read.rkey = qp->resp.rkey;
|
|
|
|
/* note res inherits the reference to mr from qp */
|
|
res->read.mr = qp->resp.mr;
|
|
qp->resp.mr = NULL;
|
|
|
|
qp->resp.res = res;
|
|
res->state = rdatm_res_state_new;
|
|
}
|
|
|
|
if (res->state == rdatm_res_state_new) {
|
|
if (res->read.resid <= mtu)
|
|
opcode = IB_OPCODE_RC_RDMA_READ_RESPONSE_ONLY;
|
|
else
|
|
opcode = IB_OPCODE_RC_RDMA_READ_RESPONSE_FIRST;
|
|
} else {
|
|
if (res->read.resid > mtu)
|
|
opcode = IB_OPCODE_RC_RDMA_READ_RESPONSE_MIDDLE;
|
|
else
|
|
opcode = IB_OPCODE_RC_RDMA_READ_RESPONSE_LAST;
|
|
}
|
|
|
|
res->state = rdatm_res_state_next;
|
|
|
|
payload = min_t(int, res->read.resid, mtu);
|
|
|
|
skb = prepare_ack_packet(qp, req_pkt, &ack_pkt, opcode, payload,
|
|
res->cur_psn, AETH_ACK_UNLIMITED, &icrc);
|
|
if (!skb)
|
|
return RESPST_ERR_RNR;
|
|
|
|
err = rxe_mem_copy(res->read.mr, res->read.va, payload_addr(&ack_pkt),
|
|
payload, from_mem_obj, &icrc);
|
|
if (err)
|
|
pr_err("Failed copying memory\n");
|
|
|
|
p = payload_addr(&ack_pkt) + payload + bth_pad(&ack_pkt);
|
|
*p = ~icrc;
|
|
|
|
err = rxe_xmit_packet(rxe, qp, &ack_pkt, skb);
|
|
if (err) {
|
|
pr_err("Failed sending RDMA reply.\n");
|
|
kfree_skb(skb);
|
|
return RESPST_ERR_RNR;
|
|
}
|
|
|
|
res->read.va += payload;
|
|
res->read.resid -= payload;
|
|
res->cur_psn = (res->cur_psn + 1) & BTH_PSN_MASK;
|
|
|
|
if (res->read.resid > 0) {
|
|
state = RESPST_DONE;
|
|
} else {
|
|
qp->resp.res = NULL;
|
|
qp->resp.opcode = -1;
|
|
qp->resp.psn = res->cur_psn;
|
|
state = RESPST_CLEANUP;
|
|
}
|
|
|
|
return state;
|
|
}
|
|
|
|
/* Executes a new request. A retried request never reach that function (send
|
|
* and writes are discarded, and reads and atomics are retried elsewhere.
|
|
*/
|
|
static enum resp_states execute(struct rxe_qp *qp, struct rxe_pkt_info *pkt)
|
|
{
|
|
enum resp_states err;
|
|
|
|
if (pkt->mask & RXE_SEND_MASK) {
|
|
if (qp_type(qp) == IB_QPT_UD ||
|
|
qp_type(qp) == IB_QPT_SMI ||
|
|
qp_type(qp) == IB_QPT_GSI) {
|
|
union rdma_network_hdr hdr;
|
|
struct sk_buff *skb = PKT_TO_SKB(pkt);
|
|
|
|
memset(&hdr, 0, sizeof(hdr));
|
|
if (skb->protocol == htons(ETH_P_IP))
|
|
memcpy(&hdr.roce4grh, ip_hdr(skb), sizeof(hdr.roce4grh));
|
|
else if (skb->protocol == htons(ETH_P_IPV6))
|
|
memcpy(&hdr.ibgrh, ipv6_hdr(skb), sizeof(hdr.ibgrh));
|
|
|
|
err = send_data_in(qp, &hdr, sizeof(hdr));
|
|
if (err)
|
|
return err;
|
|
}
|
|
err = send_data_in(qp, payload_addr(pkt), payload_size(pkt));
|
|
if (err)
|
|
return err;
|
|
} else if (pkt->mask & RXE_WRITE_MASK) {
|
|
err = write_data_in(qp, pkt);
|
|
if (err)
|
|
return err;
|
|
} else if (pkt->mask & RXE_READ_MASK) {
|
|
/* For RDMA Read we can increment the msn now. See C9-148. */
|
|
qp->resp.msn++;
|
|
return RESPST_READ_REPLY;
|
|
} else if (pkt->mask & RXE_ATOMIC_MASK) {
|
|
err = process_atomic(qp, pkt);
|
|
if (err)
|
|
return err;
|
|
} else
|
|
/* Unreachable */
|
|
WARN_ON(1);
|
|
|
|
/* We successfully processed this new request. */
|
|
qp->resp.msn++;
|
|
|
|
/* next expected psn, read handles this separately */
|
|
qp->resp.psn = (pkt->psn + 1) & BTH_PSN_MASK;
|
|
|
|
qp->resp.opcode = pkt->opcode;
|
|
qp->resp.status = IB_WC_SUCCESS;
|
|
|
|
if (pkt->mask & RXE_COMP_MASK)
|
|
return RESPST_COMPLETE;
|
|
else if (qp_type(qp) == IB_QPT_RC)
|
|
return RESPST_ACKNOWLEDGE;
|
|
else
|
|
return RESPST_CLEANUP;
|
|
}
|
|
|
|
static enum resp_states do_complete(struct rxe_qp *qp,
|
|
struct rxe_pkt_info *pkt)
|
|
{
|
|
struct rxe_cqe cqe;
|
|
struct ib_wc *wc = &cqe.ibwc;
|
|
struct ib_uverbs_wc *uwc = &cqe.uibwc;
|
|
struct rxe_recv_wqe *wqe = qp->resp.wqe;
|
|
|
|
if (unlikely(!wqe))
|
|
return RESPST_CLEANUP;
|
|
|
|
memset(&cqe, 0, sizeof(cqe));
|
|
|
|
wc->wr_id = wqe->wr_id;
|
|
wc->status = qp->resp.status;
|
|
wc->qp = &qp->ibqp;
|
|
|
|
/* fields after status are not required for errors */
|
|
if (wc->status == IB_WC_SUCCESS) {
|
|
wc->opcode = (pkt->mask & RXE_IMMDT_MASK &&
|
|
pkt->mask & RXE_WRITE_MASK) ?
|
|
IB_WC_RECV_RDMA_WITH_IMM : IB_WC_RECV;
|
|
wc->vendor_err = 0;
|
|
wc->byte_len = wqe->dma.length - wqe->dma.resid;
|
|
|
|
/* fields after byte_len are different between kernel and user
|
|
* space
|
|
*/
|
|
if (qp->rcq->is_user) {
|
|
uwc->wc_flags = IB_WC_GRH;
|
|
|
|
if (pkt->mask & RXE_IMMDT_MASK) {
|
|
uwc->wc_flags |= IB_WC_WITH_IMM;
|
|
uwc->ex.imm_data =
|
|
(__u32 __force)immdt_imm(pkt);
|
|
}
|
|
|
|
if (pkt->mask & RXE_IETH_MASK) {
|
|
uwc->wc_flags |= IB_WC_WITH_INVALIDATE;
|
|
uwc->ex.invalidate_rkey = ieth_rkey(pkt);
|
|
}
|
|
|
|
uwc->qp_num = qp->ibqp.qp_num;
|
|
|
|
if (pkt->mask & RXE_DETH_MASK)
|
|
uwc->src_qp = deth_sqp(pkt);
|
|
|
|
uwc->port_num = qp->attr.port_num;
|
|
} else {
|
|
struct sk_buff *skb = PKT_TO_SKB(pkt);
|
|
|
|
wc->wc_flags = IB_WC_GRH | IB_WC_WITH_NETWORK_HDR_TYPE;
|
|
if (skb->protocol == htons(ETH_P_IP))
|
|
wc->network_hdr_type = RDMA_NETWORK_IPV4;
|
|
else
|
|
wc->network_hdr_type = RDMA_NETWORK_IPV6;
|
|
|
|
if (pkt->mask & RXE_IMMDT_MASK) {
|
|
wc->wc_flags |= IB_WC_WITH_IMM;
|
|
wc->ex.imm_data = immdt_imm(pkt);
|
|
}
|
|
|
|
if (pkt->mask & RXE_IETH_MASK) {
|
|
struct rxe_dev *rxe = to_rdev(qp->ibqp.device);
|
|
struct rxe_mem *rmr;
|
|
|
|
wc->wc_flags |= IB_WC_WITH_INVALIDATE;
|
|
wc->ex.invalidate_rkey = ieth_rkey(pkt);
|
|
|
|
rmr = rxe_pool_get_index(&rxe->mr_pool,
|
|
wc->ex.invalidate_rkey >> 8);
|
|
if (unlikely(!rmr)) {
|
|
pr_err("Bad rkey %#x invalidation\n", wc->ex.invalidate_rkey);
|
|
return RESPST_ERROR;
|
|
}
|
|
rmr->state = RXE_MEM_STATE_FREE;
|
|
}
|
|
|
|
wc->qp = &qp->ibqp;
|
|
|
|
if (pkt->mask & RXE_DETH_MASK)
|
|
wc->src_qp = deth_sqp(pkt);
|
|
|
|
wc->port_num = qp->attr.port_num;
|
|
}
|
|
}
|
|
|
|
/* have copy for srq and reference for !srq */
|
|
if (!qp->srq)
|
|
advance_consumer(qp->rq.queue);
|
|
|
|
qp->resp.wqe = NULL;
|
|
|
|
if (rxe_cq_post(qp->rcq, &cqe, pkt ? bth_se(pkt) : 1))
|
|
return RESPST_ERR_CQ_OVERFLOW;
|
|
|
|
if (qp->resp.state == QP_STATE_ERROR)
|
|
return RESPST_CHK_RESOURCE;
|
|
|
|
if (!pkt)
|
|
return RESPST_DONE;
|
|
else if (qp_type(qp) == IB_QPT_RC)
|
|
return RESPST_ACKNOWLEDGE;
|
|
else
|
|
return RESPST_CLEANUP;
|
|
}
|
|
|
|
static int send_ack(struct rxe_qp *qp, struct rxe_pkt_info *pkt,
|
|
u8 syndrome, u32 psn)
|
|
{
|
|
int err = 0;
|
|
struct rxe_pkt_info ack_pkt;
|
|
struct sk_buff *skb;
|
|
struct rxe_dev *rxe = to_rdev(qp->ibqp.device);
|
|
|
|
skb = prepare_ack_packet(qp, pkt, &ack_pkt, IB_OPCODE_RC_ACKNOWLEDGE,
|
|
0, psn, syndrome, NULL);
|
|
if (!skb) {
|
|
err = -ENOMEM;
|
|
goto err1;
|
|
}
|
|
|
|
err = rxe_xmit_packet(rxe, qp, &ack_pkt, skb);
|
|
if (err) {
|
|
pr_err_ratelimited("Failed sending ack\n");
|
|
kfree_skb(skb);
|
|
}
|
|
|
|
err1:
|
|
return err;
|
|
}
|
|
|
|
static int send_atomic_ack(struct rxe_qp *qp, struct rxe_pkt_info *pkt,
|
|
u8 syndrome)
|
|
{
|
|
int rc = 0;
|
|
struct rxe_pkt_info ack_pkt;
|
|
struct sk_buff *skb;
|
|
struct sk_buff *skb_copy;
|
|
struct rxe_dev *rxe = to_rdev(qp->ibqp.device);
|
|
struct resp_res *res;
|
|
|
|
skb = prepare_ack_packet(qp, pkt, &ack_pkt,
|
|
IB_OPCODE_RC_ATOMIC_ACKNOWLEDGE, 0, pkt->psn,
|
|
syndrome, NULL);
|
|
if (!skb) {
|
|
rc = -ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
skb_copy = skb_clone(skb, GFP_ATOMIC);
|
|
if (skb_copy)
|
|
rxe_add_ref(qp); /* for the new SKB */
|
|
else {
|
|
pr_warn("Could not clone atomic response\n");
|
|
rc = -ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
res = &qp->resp.resources[qp->resp.res_head];
|
|
free_rd_atomic_resource(qp, res);
|
|
rxe_advance_resp_resource(qp);
|
|
|
|
res->type = RXE_ATOMIC_MASK;
|
|
res->atomic.skb = skb;
|
|
res->first_psn = qp->resp.psn;
|
|
res->last_psn = qp->resp.psn;
|
|
res->cur_psn = qp->resp.psn;
|
|
|
|
rc = rxe_xmit_packet(rxe, qp, &ack_pkt, skb_copy);
|
|
if (rc) {
|
|
pr_err_ratelimited("Failed sending ack\n");
|
|
rxe_drop_ref(qp);
|
|
kfree_skb(skb_copy);
|
|
}
|
|
|
|
out:
|
|
return rc;
|
|
}
|
|
|
|
static enum resp_states acknowledge(struct rxe_qp *qp,
|
|
struct rxe_pkt_info *pkt)
|
|
{
|
|
if (qp_type(qp) != IB_QPT_RC)
|
|
return RESPST_CLEANUP;
|
|
|
|
if (qp->resp.aeth_syndrome != AETH_ACK_UNLIMITED)
|
|
send_ack(qp, pkt, qp->resp.aeth_syndrome, pkt->psn);
|
|
else if (pkt->mask & RXE_ATOMIC_MASK)
|
|
send_atomic_ack(qp, pkt, AETH_ACK_UNLIMITED);
|
|
else if (bth_ack(pkt))
|
|
send_ack(qp, pkt, AETH_ACK_UNLIMITED, pkt->psn);
|
|
|
|
return RESPST_CLEANUP;
|
|
}
|
|
|
|
static enum resp_states cleanup(struct rxe_qp *qp,
|
|
struct rxe_pkt_info *pkt)
|
|
{
|
|
struct sk_buff *skb;
|
|
|
|
if (pkt) {
|
|
skb = skb_dequeue(&qp->req_pkts);
|
|
rxe_drop_ref(qp);
|
|
kfree_skb(skb);
|
|
}
|
|
|
|
if (qp->resp.mr) {
|
|
rxe_drop_ref(qp->resp.mr);
|
|
qp->resp.mr = NULL;
|
|
}
|
|
|
|
return RESPST_DONE;
|
|
}
|
|
|
|
static struct resp_res *find_resource(struct rxe_qp *qp, u32 psn)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < qp->attr.max_rd_atomic; i++) {
|
|
struct resp_res *res = &qp->resp.resources[i];
|
|
|
|
if (res->type == 0)
|
|
continue;
|
|
|
|
if (psn_compare(psn, res->first_psn) >= 0 &&
|
|
psn_compare(psn, res->last_psn) <= 0) {
|
|
return res;
|
|
}
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
static enum resp_states duplicate_request(struct rxe_qp *qp,
|
|
struct rxe_pkt_info *pkt)
|
|
{
|
|
enum resp_states rc;
|
|
|
|
if (pkt->mask & RXE_SEND_MASK ||
|
|
pkt->mask & RXE_WRITE_MASK) {
|
|
/* SEND. Ack again and cleanup. C9-105. */
|
|
if (bth_ack(pkt))
|
|
send_ack(qp, pkt, AETH_ACK_UNLIMITED, qp->resp.psn - 1);
|
|
rc = RESPST_CLEANUP;
|
|
goto out;
|
|
} else if (pkt->mask & RXE_READ_MASK) {
|
|
struct resp_res *res;
|
|
|
|
res = find_resource(qp, pkt->psn);
|
|
if (!res) {
|
|
/* Resource not found. Class D error. Drop the
|
|
* request.
|
|
*/
|
|
rc = RESPST_CLEANUP;
|
|
goto out;
|
|
} else {
|
|
/* Ensure this new request is the same as the previous
|
|
* one or a subset of it.
|
|
*/
|
|
u64 iova = reth_va(pkt);
|
|
u32 resid = reth_len(pkt);
|
|
|
|
if (iova < res->read.va_org ||
|
|
resid > res->read.length ||
|
|
(iova + resid) > (res->read.va_org +
|
|
res->read.length)) {
|
|
rc = RESPST_CLEANUP;
|
|
goto out;
|
|
}
|
|
|
|
if (reth_rkey(pkt) != res->read.rkey) {
|
|
rc = RESPST_CLEANUP;
|
|
goto out;
|
|
}
|
|
|
|
res->cur_psn = pkt->psn;
|
|
res->state = (pkt->psn == res->first_psn) ?
|
|
rdatm_res_state_new :
|
|
rdatm_res_state_replay;
|
|
|
|
/* Reset the resource, except length. */
|
|
res->read.va_org = iova;
|
|
res->read.va = iova;
|
|
res->read.resid = resid;
|
|
|
|
/* Replay the RDMA read reply. */
|
|
qp->resp.res = res;
|
|
rc = RESPST_READ_REPLY;
|
|
goto out;
|
|
}
|
|
} else {
|
|
struct resp_res *res;
|
|
|
|
/* Find the operation in our list of responder resources. */
|
|
res = find_resource(qp, pkt->psn);
|
|
if (res) {
|
|
struct sk_buff *skb_copy;
|
|
|
|
skb_copy = skb_clone(res->atomic.skb, GFP_ATOMIC);
|
|
if (skb_copy) {
|
|
rxe_add_ref(qp); /* for the new SKB */
|
|
} else {
|
|
pr_warn("Couldn't clone atomic resp\n");
|
|
rc = RESPST_CLEANUP;
|
|
goto out;
|
|
}
|
|
bth_set_psn(SKB_TO_PKT(skb_copy),
|
|
qp->resp.psn - 1);
|
|
/* Resend the result. */
|
|
rc = rxe_xmit_packet(to_rdev(qp->ibqp.device), qp,
|
|
pkt, skb_copy);
|
|
if (rc) {
|
|
pr_err("Failed resending result. This flow is not handled - skb ignored\n");
|
|
kfree_skb(skb_copy);
|
|
rc = RESPST_CLEANUP;
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
/* Resource not found. Class D error. Drop the request. */
|
|
rc = RESPST_CLEANUP;
|
|
goto out;
|
|
}
|
|
out:
|
|
return rc;
|
|
}
|
|
|
|
/* Process a class A or C. Both are treated the same in this implementation. */
|
|
static void do_class_ac_error(struct rxe_qp *qp, u8 syndrome,
|
|
enum ib_wc_status status)
|
|
{
|
|
qp->resp.aeth_syndrome = syndrome;
|
|
qp->resp.status = status;
|
|
|
|
/* indicate that we should go through the ERROR state */
|
|
qp->resp.goto_error = 1;
|
|
}
|
|
|
|
static enum resp_states do_class_d1e_error(struct rxe_qp *qp)
|
|
{
|
|
/* UC */
|
|
if (qp->srq) {
|
|
/* Class E */
|
|
qp->resp.drop_msg = 1;
|
|
if (qp->resp.wqe) {
|
|
qp->resp.status = IB_WC_REM_INV_REQ_ERR;
|
|
return RESPST_COMPLETE;
|
|
} else {
|
|
return RESPST_CLEANUP;
|
|
}
|
|
} else {
|
|
/* Class D1. This packet may be the start of a
|
|
* new message and could be valid. The previous
|
|
* message is invalid and ignored. reset the
|
|
* recv wr to its original state
|
|
*/
|
|
if (qp->resp.wqe) {
|
|
qp->resp.wqe->dma.resid = qp->resp.wqe->dma.length;
|
|
qp->resp.wqe->dma.cur_sge = 0;
|
|
qp->resp.wqe->dma.sge_offset = 0;
|
|
qp->resp.opcode = -1;
|
|
}
|
|
|
|
if (qp->resp.mr) {
|
|
rxe_drop_ref(qp->resp.mr);
|
|
qp->resp.mr = NULL;
|
|
}
|
|
|
|
return RESPST_CLEANUP;
|
|
}
|
|
}
|
|
|
|
int rxe_responder(void *arg)
|
|
{
|
|
struct rxe_qp *qp = (struct rxe_qp *)arg;
|
|
enum resp_states state;
|
|
struct rxe_pkt_info *pkt = NULL;
|
|
int ret = 0;
|
|
|
|
qp->resp.aeth_syndrome = AETH_ACK_UNLIMITED;
|
|
|
|
if (!qp->valid) {
|
|
ret = -EINVAL;
|
|
goto done;
|
|
}
|
|
|
|
switch (qp->resp.state) {
|
|
case QP_STATE_RESET:
|
|
state = RESPST_RESET;
|
|
break;
|
|
|
|
default:
|
|
state = RESPST_GET_REQ;
|
|
break;
|
|
}
|
|
|
|
while (1) {
|
|
pr_debug("state = %s\n", resp_state_name[state]);
|
|
switch (state) {
|
|
case RESPST_GET_REQ:
|
|
state = get_req(qp, &pkt);
|
|
break;
|
|
case RESPST_CHK_PSN:
|
|
state = check_psn(qp, pkt);
|
|
break;
|
|
case RESPST_CHK_OP_SEQ:
|
|
state = check_op_seq(qp, pkt);
|
|
break;
|
|
case RESPST_CHK_OP_VALID:
|
|
state = check_op_valid(qp, pkt);
|
|
break;
|
|
case RESPST_CHK_RESOURCE:
|
|
state = check_resource(qp, pkt);
|
|
break;
|
|
case RESPST_CHK_LENGTH:
|
|
state = check_length(qp, pkt);
|
|
break;
|
|
case RESPST_CHK_RKEY:
|
|
state = check_rkey(qp, pkt);
|
|
break;
|
|
case RESPST_EXECUTE:
|
|
state = execute(qp, pkt);
|
|
break;
|
|
case RESPST_COMPLETE:
|
|
state = do_complete(qp, pkt);
|
|
break;
|
|
case RESPST_READ_REPLY:
|
|
state = read_reply(qp, pkt);
|
|
break;
|
|
case RESPST_ACKNOWLEDGE:
|
|
state = acknowledge(qp, pkt);
|
|
break;
|
|
case RESPST_CLEANUP:
|
|
state = cleanup(qp, pkt);
|
|
break;
|
|
case RESPST_DUPLICATE_REQUEST:
|
|
state = duplicate_request(qp, pkt);
|
|
break;
|
|
case RESPST_ERR_PSN_OUT_OF_SEQ:
|
|
/* RC only - Class B. Drop packet. */
|
|
send_ack(qp, pkt, AETH_NAK_PSN_SEQ_ERROR, qp->resp.psn);
|
|
state = RESPST_CLEANUP;
|
|
break;
|
|
|
|
case RESPST_ERR_TOO_MANY_RDMA_ATM_REQ:
|
|
case RESPST_ERR_MISSING_OPCODE_FIRST:
|
|
case RESPST_ERR_MISSING_OPCODE_LAST_C:
|
|
case RESPST_ERR_UNSUPPORTED_OPCODE:
|
|
case RESPST_ERR_MISALIGNED_ATOMIC:
|
|
/* RC Only - Class C. */
|
|
do_class_ac_error(qp, AETH_NAK_INVALID_REQ,
|
|
IB_WC_REM_INV_REQ_ERR);
|
|
state = RESPST_COMPLETE;
|
|
break;
|
|
|
|
case RESPST_ERR_MISSING_OPCODE_LAST_D1E:
|
|
state = do_class_d1e_error(qp);
|
|
break;
|
|
case RESPST_ERR_RNR:
|
|
if (qp_type(qp) == IB_QPT_RC) {
|
|
/* RC - class B */
|
|
send_ack(qp, pkt, AETH_RNR_NAK |
|
|
(~AETH_TYPE_MASK &
|
|
qp->attr.min_rnr_timer),
|
|
pkt->psn);
|
|
} else {
|
|
/* UD/UC - class D */
|
|
qp->resp.drop_msg = 1;
|
|
}
|
|
state = RESPST_CLEANUP;
|
|
break;
|
|
|
|
case RESPST_ERR_RKEY_VIOLATION:
|
|
if (qp_type(qp) == IB_QPT_RC) {
|
|
/* Class C */
|
|
do_class_ac_error(qp, AETH_NAK_REM_ACC_ERR,
|
|
IB_WC_REM_ACCESS_ERR);
|
|
state = RESPST_COMPLETE;
|
|
} else {
|
|
qp->resp.drop_msg = 1;
|
|
if (qp->srq) {
|
|
/* UC/SRQ Class D */
|
|
qp->resp.status = IB_WC_REM_ACCESS_ERR;
|
|
state = RESPST_COMPLETE;
|
|
} else {
|
|
/* UC/non-SRQ Class E. */
|
|
state = RESPST_CLEANUP;
|
|
}
|
|
}
|
|
break;
|
|
|
|
case RESPST_ERR_LENGTH:
|
|
if (qp_type(qp) == IB_QPT_RC) {
|
|
/* Class C */
|
|
do_class_ac_error(qp, AETH_NAK_INVALID_REQ,
|
|
IB_WC_REM_INV_REQ_ERR);
|
|
state = RESPST_COMPLETE;
|
|
} else if (qp->srq) {
|
|
/* UC/UD - class E */
|
|
qp->resp.status = IB_WC_REM_INV_REQ_ERR;
|
|
state = RESPST_COMPLETE;
|
|
} else {
|
|
/* UC/UD - class D */
|
|
qp->resp.drop_msg = 1;
|
|
state = RESPST_CLEANUP;
|
|
}
|
|
break;
|
|
|
|
case RESPST_ERR_MALFORMED_WQE:
|
|
/* All, Class A. */
|
|
do_class_ac_error(qp, AETH_NAK_REM_OP_ERR,
|
|
IB_WC_LOC_QP_OP_ERR);
|
|
state = RESPST_COMPLETE;
|
|
break;
|
|
|
|
case RESPST_ERR_CQ_OVERFLOW:
|
|
/* All - Class G */
|
|
state = RESPST_ERROR;
|
|
break;
|
|
|
|
case RESPST_DONE:
|
|
if (qp->resp.goto_error) {
|
|
state = RESPST_ERROR;
|
|
break;
|
|
}
|
|
|
|
goto done;
|
|
|
|
case RESPST_EXIT:
|
|
if (qp->resp.goto_error) {
|
|
state = RESPST_ERROR;
|
|
break;
|
|
}
|
|
|
|
goto exit;
|
|
|
|
case RESPST_RESET: {
|
|
struct sk_buff *skb;
|
|
|
|
while ((skb = skb_dequeue(&qp->req_pkts))) {
|
|
rxe_drop_ref(qp);
|
|
kfree_skb(skb);
|
|
}
|
|
|
|
while (!qp->srq && qp->rq.queue &&
|
|
queue_head(qp->rq.queue))
|
|
advance_consumer(qp->rq.queue);
|
|
|
|
qp->resp.wqe = NULL;
|
|
goto exit;
|
|
}
|
|
|
|
case RESPST_ERROR:
|
|
qp->resp.goto_error = 0;
|
|
pr_warn("qp#%d moved to error state\n", qp_num(qp));
|
|
rxe_qp_error(qp);
|
|
goto exit;
|
|
|
|
default:
|
|
WARN_ON(1);
|
|
}
|
|
}
|
|
|
|
exit:
|
|
ret = -EAGAIN;
|
|
done:
|
|
return ret;
|
|
}
|