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linux_dsm_epyc7002/drivers/infiniband/sw/rxe/rxe_resp.c
Steve Wise 2030abddec rxe: correctly calculate iCRC for unaligned payloads 
If RoCE PDUs being sent or received contain pad bytes, then the iCRC
is miscalculated, resulting in PDUs being emitted by RXE with an incorrect
iCRC, as well as ingress PDUs being dropped due to erroneously detecting
a bad iCRC in the PDU.  The fix is to include the pad bytes, if any,
in iCRC computations.

Note: This bug has caused broken on-the-wire compatibility with actual
hardware RoCE devices since the soft-RoCE driver was first put into the
mainstream kernel.  Fixing it will create an incompatibility with the
original soft-RoCE devices, but is necessary to be compatible with real
hardware devices.

Fixes: 8700e3e7c4 ("Soft RoCE driver")
Signed-off-by: Steve Wise <larrystevenwise@gmail.com>
Link: https://lore.kernel.org/r/20191203020319.15036-2-larrystevenwise@gmail.com
Signed-off-by: Doug Ledford <dledford@redhat.com>
2019-12-09 13:55:26 -05:00

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/*
* Copyright (c) 2016 Mellanox Technologies Ltd. All rights reserved.
* Copyright (c) 2015 System Fabric Works, Inc. All rights reserved.
*
* This software is available to you under a choice of one of two
* licenses. You may choose to be licensed under the terms of the GNU
* General Public License (GPL) Version 2, available from the file
* COPYING in the main directory of this source tree, or the
* OpenIB.org BSD license below:
*
* 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.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#include <linux/skbuff.h>
#include "rxe.h"
#include "rxe_loc.h"
#include "rxe_queue.h"
enum resp_states {
RESPST_NONE,
RESPST_GET_REQ,
RESPST_CHK_PSN,
RESPST_CHK_OP_SEQ,
RESPST_CHK_OP_VALID,
RESPST_CHK_RESOURCE,
RESPST_CHK_LENGTH,
RESPST_CHK_RKEY,
RESPST_EXECUTE,
RESPST_READ_REPLY,
RESPST_COMPLETE,
RESPST_ACKNOWLEDGE,
RESPST_CLEANUP,
RESPST_DUPLICATE_REQUEST,
RESPST_ERR_MALFORMED_WQE,
RESPST_ERR_UNSUPPORTED_OPCODE,
RESPST_ERR_MISALIGNED_ATOMIC,
RESPST_ERR_PSN_OUT_OF_SEQ,
RESPST_ERR_MISSING_OPCODE_FIRST,
RESPST_ERR_MISSING_OPCODE_LAST_C,
RESPST_ERR_MISSING_OPCODE_LAST_D1E,
RESPST_ERR_TOO_MANY_RDMA_ATM_REQ,
RESPST_ERR_RNR,
RESPST_ERR_RKEY_VIOLATION,
RESPST_ERR_LENGTH,
RESPST_ERR_CQ_OVERFLOW,
RESPST_ERROR,
RESPST_RESET,
RESPST_DONE,
RESPST_EXIT,
};
static char *resp_state_name[] = {
[RESPST_NONE] = "NONE",
[RESPST_GET_REQ] = "GET_REQ",
[RESPST_CHK_PSN] = "CHK_PSN",
[RESPST_CHK_OP_SEQ] = "CHK_OP_SEQ",
[RESPST_CHK_OP_VALID] = "CHK_OP_VALID",
[RESPST_CHK_RESOURCE] = "CHK_RESOURCE",
[RESPST_CHK_LENGTH] = "CHK_LENGTH",
[RESPST_CHK_RKEY] = "CHK_RKEY",
[RESPST_EXECUTE] = "EXECUTE",
[RESPST_READ_REPLY] = "READ_REPLY",
[RESPST_COMPLETE] = "COMPLETE",
[RESPST_ACKNOWLEDGE] = "ACKNOWLEDGE",
[RESPST_CLEANUP] = "CLEANUP",
[RESPST_DUPLICATE_REQUEST] = "DUPLICATE_REQUEST",
[RESPST_ERR_MALFORMED_WQE] = "ERR_MALFORMED_WQE",
[RESPST_ERR_UNSUPPORTED_OPCODE] = "ERR_UNSUPPORTED_OPCODE",
[RESPST_ERR_MISALIGNED_ATOMIC] = "ERR_MISALIGNED_ATOMIC",
[RESPST_ERR_PSN_OUT_OF_SEQ] = "ERR_PSN_OUT_OF_SEQ",
[RESPST_ERR_MISSING_OPCODE_FIRST] = "ERR_MISSING_OPCODE_FIRST",
[RESPST_ERR_MISSING_OPCODE_LAST_C] = "ERR_MISSING_OPCODE_LAST_C",
[RESPST_ERR_MISSING_OPCODE_LAST_D1E] = "ERR_MISSING_OPCODE_LAST_D1E",
[RESPST_ERR_TOO_MANY_RDMA_ATM_REQ] = "ERR_TOO_MANY_RDMA_ATM_REQ",
[RESPST_ERR_RNR] = "ERR_RNR",
[RESPST_ERR_RKEY_VIOLATION] = "ERR_RKEY_VIOLATION",
[RESPST_ERR_LENGTH] = "ERR_LENGTH",
[RESPST_ERR_CQ_OVERFLOW] = "ERR_CQ_OVERFLOW",
[RESPST_ERROR] = "ERROR",
[RESPST_RESET] = "RESET",
[RESPST_DONE] = "DONE",
[RESPST_EXIT] = "EXIT",
};
/* rxe_recv calls here to add a request packet to the input queue */
void rxe_resp_queue_pkt(struct rxe_qp *qp, struct sk_buff *skb)
{
int must_sched;
struct rxe_pkt_info *pkt = SKB_TO_PKT(skb);
skb_queue_tail(&qp->req_pkts, skb);
must_sched = (pkt->opcode == IB_OPCODE_RC_RDMA_READ_REQUEST) ||
(skb_queue_len(&qp->req_pkts) > 1);
rxe_run_task(&qp->resp.task, must_sched);
}
static inline enum resp_states get_req(struct rxe_qp *qp,
struct rxe_pkt_info **pkt_p)
{
struct sk_buff *skb;
if (qp->resp.state == QP_STATE_ERROR) {
while ((skb = skb_dequeue(&qp->req_pkts))) {
rxe_drop_ref(qp);
kfree_skb(skb);
}
/* go drain recv wr queue */
return RESPST_CHK_RESOURCE;
}
skb = skb_peek(&qp->req_pkts);
if (!skb)
return RESPST_EXIT;
*pkt_p = SKB_TO_PKT(skb);
return (qp->resp.res) ? RESPST_READ_REPLY : RESPST_CHK_PSN;
}
static enum resp_states check_psn(struct rxe_qp *qp,
struct rxe_pkt_info *pkt)
{
int diff = psn_compare(pkt->psn, qp->resp.psn);
struct rxe_dev *rxe = to_rdev(qp->ibqp.device);
switch (qp_type(qp)) {
case IB_QPT_RC:
if (diff > 0) {
if (qp->resp.sent_psn_nak)
return RESPST_CLEANUP;
qp->resp.sent_psn_nak = 1;
rxe_counter_inc(rxe, RXE_CNT_OUT_OF_SEQ_REQ);
return RESPST_ERR_PSN_OUT_OF_SEQ;
} else if (diff < 0) {
rxe_counter_inc(rxe, RXE_CNT_DUP_REQ);
return RESPST_DUPLICATE_REQUEST;
}
if (qp->resp.sent_psn_nak)
qp->resp.sent_psn_nak = 0;
break;
case IB_QPT_UC:
if (qp->resp.drop_msg || diff != 0) {
if (pkt->mask & RXE_START_MASK) {
qp->resp.drop_msg = 0;
return RESPST_CHK_OP_SEQ;
}
qp->resp.drop_msg = 1;
return RESPST_CLEANUP;
}
break;
default:
break;
}
return RESPST_CHK_OP_SEQ;
}
static enum resp_states check_op_seq(struct rxe_qp *qp,
struct rxe_pkt_info *pkt)
{
switch (qp_type(qp)) {
case IB_QPT_RC:
switch (qp->resp.opcode) {
case IB_OPCODE_RC_SEND_FIRST:
case IB_OPCODE_RC_SEND_MIDDLE:
switch (pkt->opcode) {
case IB_OPCODE_RC_SEND_MIDDLE:
case IB_OPCODE_RC_SEND_LAST:
case IB_OPCODE_RC_SEND_LAST_WITH_IMMEDIATE:
case IB_OPCODE_RC_SEND_LAST_WITH_INVALIDATE:
return RESPST_CHK_OP_VALID;
default:
return RESPST_ERR_MISSING_OPCODE_LAST_C;
}
case IB_OPCODE_RC_RDMA_WRITE_FIRST:
case IB_OPCODE_RC_RDMA_WRITE_MIDDLE:
switch (pkt->opcode) {
case IB_OPCODE_RC_RDMA_WRITE_MIDDLE:
case IB_OPCODE_RC_RDMA_WRITE_LAST:
case IB_OPCODE_RC_RDMA_WRITE_LAST_WITH_IMMEDIATE:
return RESPST_CHK_OP_VALID;
default:
return RESPST_ERR_MISSING_OPCODE_LAST_C;
}
default:
switch (pkt->opcode) {
case IB_OPCODE_RC_SEND_MIDDLE:
case IB_OPCODE_RC_SEND_LAST:
case IB_OPCODE_RC_SEND_LAST_WITH_IMMEDIATE:
case IB_OPCODE_RC_SEND_LAST_WITH_INVALIDATE:
case IB_OPCODE_RC_RDMA_WRITE_MIDDLE:
case IB_OPCODE_RC_RDMA_WRITE_LAST:
case IB_OPCODE_RC_RDMA_WRITE_LAST_WITH_IMMEDIATE:
return RESPST_ERR_MISSING_OPCODE_FIRST;
default:
return RESPST_CHK_OP_VALID;
}
}
break;
case IB_QPT_UC:
switch (qp->resp.opcode) {
case IB_OPCODE_UC_SEND_FIRST:
case IB_OPCODE_UC_SEND_MIDDLE:
switch (pkt->opcode) {
case IB_OPCODE_UC_SEND_MIDDLE:
case IB_OPCODE_UC_SEND_LAST:
case IB_OPCODE_UC_SEND_LAST_WITH_IMMEDIATE:
return RESPST_CHK_OP_VALID;
default:
return RESPST_ERR_MISSING_OPCODE_LAST_D1E;
}
case IB_OPCODE_UC_RDMA_WRITE_FIRST:
case IB_OPCODE_UC_RDMA_WRITE_MIDDLE:
switch (pkt->opcode) {
case IB_OPCODE_UC_RDMA_WRITE_MIDDLE:
case IB_OPCODE_UC_RDMA_WRITE_LAST:
case IB_OPCODE_UC_RDMA_WRITE_LAST_WITH_IMMEDIATE:
return RESPST_CHK_OP_VALID;
default:
return RESPST_ERR_MISSING_OPCODE_LAST_D1E;
}
default:
switch (pkt->opcode) {
case IB_OPCODE_UC_SEND_MIDDLE:
case IB_OPCODE_UC_SEND_LAST:
case IB_OPCODE_UC_SEND_LAST_WITH_IMMEDIATE:
case IB_OPCODE_UC_RDMA_WRITE_MIDDLE:
case IB_OPCODE_UC_RDMA_WRITE_LAST:
case IB_OPCODE_UC_RDMA_WRITE_LAST_WITH_IMMEDIATE:
qp->resp.drop_msg = 1;
return RESPST_CLEANUP;
default:
return RESPST_CHK_OP_VALID;
}
}
break;
default:
return RESPST_CHK_OP_VALID;
}
}
static enum resp_states check_op_valid(struct rxe_qp *qp,
struct rxe_pkt_info *pkt)
{
switch (qp_type(qp)) {
case IB_QPT_RC:
if (((pkt->mask & RXE_READ_MASK) &&
!(qp->attr.qp_access_flags & IB_ACCESS_REMOTE_READ)) ||
((pkt->mask & RXE_WRITE_MASK) &&
!(qp->attr.qp_access_flags & IB_ACCESS_REMOTE_WRITE)) ||
((pkt->mask & RXE_ATOMIC_MASK) &&
!(qp->attr.qp_access_flags & IB_ACCESS_REMOTE_ATOMIC))) {
return RESPST_ERR_UNSUPPORTED_OPCODE;
}
break;
case IB_QPT_UC:
if ((pkt->mask & RXE_WRITE_MASK) &&
!(qp->attr.qp_access_flags & IB_ACCESS_REMOTE_WRITE)) {
qp->resp.drop_msg = 1;
return RESPST_CLEANUP;
}
break;
case IB_QPT_UD:
case IB_QPT_SMI:
case IB_QPT_GSI:
break;
default:
WARN_ON_ONCE(1);
break;
}
return RESPST_CHK_RESOURCE;
}
static enum resp_states get_srq_wqe(struct rxe_qp *qp)
{
struct rxe_srq *srq = qp->srq;
struct rxe_queue *q = srq->rq.queue;
struct rxe_recv_wqe *wqe;
struct ib_event ev;
if (srq->error)
return RESPST_ERR_RNR;
spin_lock_bh(&srq->rq.consumer_lock);
wqe = queue_head(q);
if (!wqe) {
spin_unlock_bh(&srq->rq.consumer_lock);
return RESPST_ERR_RNR;
}
/* note kernel and user space recv wqes have same size */
memcpy(&qp->resp.srq_wqe, wqe, sizeof(qp->resp.srq_wqe));
qp->resp.wqe = &qp->resp.srq_wqe.wqe;
advance_consumer(q);
if (srq->limit && srq->ibsrq.event_handler &&
(queue_count(q) < srq->limit)) {
srq->limit = 0;
goto event;
}
spin_unlock_bh(&srq->rq.consumer_lock);
return RESPST_CHK_LENGTH;
event:
spin_unlock_bh(&srq->rq.consumer_lock);
ev.device = qp->ibqp.device;
ev.element.srq = qp->ibqp.srq;
ev.event = IB_EVENT_SRQ_LIMIT_REACHED;
srq->ibsrq.event_handler(&ev, srq->ibsrq.srq_context);
return RESPST_CHK_LENGTH;
}
static enum resp_states check_resource(struct rxe_qp *qp,
struct rxe_pkt_info *pkt)
{
struct rxe_srq *srq = qp->srq;
if (qp->resp.state == QP_STATE_ERROR) {
if (qp->resp.wqe) {
qp->resp.status = IB_WC_WR_FLUSH_ERR;
return RESPST_COMPLETE;
} else if (!srq) {
qp->resp.wqe = queue_head(qp->rq.queue);
if (qp->resp.wqe) {
qp->resp.status = IB_WC_WR_FLUSH_ERR;
return RESPST_COMPLETE;
} else {
return RESPST_EXIT;
}
} else {
return RESPST_EXIT;
}
}
if (pkt->mask & RXE_READ_OR_ATOMIC) {
/* it is the requesters job to not send
* too many read/atomic ops, we just
* recycle the responder resource queue
*/
if (likely(qp->attr.max_dest_rd_atomic > 0))
return RESPST_CHK_LENGTH;
else
return RESPST_ERR_TOO_MANY_RDMA_ATM_REQ;
}
if (pkt->mask & RXE_RWR_MASK) {
if (srq)
return get_srq_wqe(qp);
qp->resp.wqe = queue_head(qp->rq.queue);
return (qp->resp.wqe) ? RESPST_CHK_LENGTH : RESPST_ERR_RNR;
}
return RESPST_CHK_LENGTH;
}
static enum resp_states check_length(struct rxe_qp *qp,
struct rxe_pkt_info *pkt)
{
switch (qp_type(qp)) {
case IB_QPT_RC:
return RESPST_CHK_RKEY;
case IB_QPT_UC:
return RESPST_CHK_RKEY;
default:
return RESPST_CHK_RKEY;
}
}
static enum resp_states check_rkey(struct rxe_qp *qp,
struct rxe_pkt_info *pkt)
{
struct rxe_mem *mem = NULL;
u64 va;
u32 rkey;
u32 resid;
u32 pktlen;
int mtu = qp->mtu;
enum resp_states state;
int access;
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);
qp->resp.length = 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;
}
/* A zero-byte op is not required to set an addr or rkey. */
if ((pkt->mask & (RXE_READ_MASK | RXE_WRITE_OR_SEND)) &&
(pkt->mask & RXE_RETH_MASK) &&
reth_len(pkt) == 0) {
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 err;
}
if (unlikely(mem->state == RXE_MEM_STATE_FREE)) {
state = RESPST_ERR_RKEY_VIOLATION;
goto err;
}
if (mem_check_range(mem, va, resid)) {
state = RESPST_ERR_RKEY_VIOLATION;
goto err;
}
if (pkt->mask & RXE_WRITE_MASK) {
if (resid > mtu) {
if (pktlen != mtu || bth_pad(pkt)) {
state = RESPST_ERR_LENGTH;
goto err;
}
} else {
if (pktlen != resid) {
state = RESPST_ERR_LENGTH;
goto err;
}
if ((bth_pad(pkt) != (0x3 & (-resid)))) {
/* This case may not be exactly that
* but nothing else fits.
*/
state = RESPST_ERR_LENGTH;
goto err;
}
}
}
WARN_ON_ONCE(qp->resp.mr);
qp->resp.mr = mem;
return RESPST_EXECUTE;
err:
if (mem)
rxe_drop_ref(mem);
return state;
}
static enum resp_states send_data_in(struct rxe_qp *qp, void *data_addr,
int data_len)
{
int err;
err = copy_data(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_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_prepare(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_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->replay = 0;
res->read.va = qp->resp.va;
res->read.va_org = qp->resp.va;
res->first_psn = req_pkt->psn;
if (reth_len(req_pkt)) {
res->last_psn = (req_pkt->psn +
(reth_len(req_pkt) + mtu - 1) /
mtu - 1) & BTH_PSN_MASK;
} else {
res->last_psn = res->first_psn;
}
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");
if (bth_pad(&ack_pkt)) {
struct rxe_dev *rxe = to_rdev(qp->ibqp.device);
u8 *pad = payload_addr(&ack_pkt) + payload;
memset(pad, 0, bth_pad(&ack_pkt));
icrc = rxe_crc32(rxe, icrc, pad, bth_pad(&ack_pkt));
}
p = payload_addr(&ack_pkt) + payload + bth_pad(&ack_pkt);
*p = ~icrc;
err = rxe_xmit_packet(qp, &ack_pkt, skb);
if (err) {
pr_err("Failed sending RDMA reply.\n");
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;
if (!res->replay)
qp->resp.opcode = -1;
if (psn_compare(res->cur_psn, qp->resp.psn) >= 0)
qp->resp.psn = res->cur_psn;
state = RESPST_CLEANUP;
}
return state;
}
static void build_rdma_network_hdr(union rdma_network_hdr *hdr,
struct rxe_pkt_info *pkt)
{
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));
}
/* 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;
build_rdma_network_hdr(&hdr, pkt);
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_ONCE(1);
}
/* next expected psn, read handles this separately */
qp->resp.psn = (pkt->psn + 1) & BTH_PSN_MASK;
qp->resp.ack_psn = qp->resp.psn;
qp->resp.opcode = pkt->opcode;
qp->resp.status = IB_WC_SUCCESS;
if (pkt->mask & RXE_COMP_MASK) {
/* We successfully processed this new request. */
qp->resp.msn++;
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;
struct rxe_dev *rxe = to_rdev(qp->ibqp.device);
if (unlikely(!wqe))
return RESPST_CLEANUP;
memset(&cqe, 0, sizeof(cqe));
if (qp->rcq->is_user) {
uwc->status = qp->resp.status;
uwc->qp_num = qp->ibqp.qp_num;
uwc->wr_id = wqe->wr_id;
} else {
wc->status = qp->resp.status;
wc->qp = &qp->ibqp;
wc->wr_id = wqe->wr_id;
}
if (wc->status == IB_WC_SUCCESS) {
rxe_counter_inc(rxe, RXE_CNT_RDMA_RECV);
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 = (pkt->mask & RXE_IMMDT_MASK &&
pkt->mask & RXE_WRITE_MASK) ?
qp->resp.length : 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 = 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 (is_vlan_dev(skb->dev)) {
wc->wc_flags |= IB_WC_WITH_VLAN;
wc->vlan_id = vlan_dev_vlan_id(skb->dev);
}
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_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;
rxe_drop_ref(rmr);
}
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;
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(qp, &ack_pkt, skb);
if (err)
pr_err_ratelimited("Failed sending ack\n");
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 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;
}
rxe_add_ref(qp);
res = &qp->resp.resources[qp->resp.res_head];
free_rd_atomic_resource(qp, res);
rxe_advance_resp_resource(qp);
memcpy(SKB_TO_PKT(skb), &ack_pkt, sizeof(ack_pkt));
memset((unsigned char *)SKB_TO_PKT(skb) + sizeof(ack_pkt), 0,
sizeof(skb->cb) - sizeof(ack_pkt));
skb_get(skb);
res->type = RXE_ATOMIC_MASK;
res->atomic.skb = skb;
res->first_psn = ack_pkt.psn;
res->last_psn = ack_pkt.psn;
res->cur_psn = ack_pkt.psn;
rc = rxe_xmit_packet(qp, &ack_pkt, skb);
if (rc) {
pr_err_ratelimited("Failed sending ack\n");
rxe_drop_ref(qp);
}
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_dest_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;
u32 prev_psn = (qp->resp.ack_psn - 1) & BTH_PSN_MASK;
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, prev_psn);
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;
res->replay = 1;
/* 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) {
skb_get(res->atomic.skb);
/* Resend the result. */
rc = rxe_xmit_packet(qp, pkt, res->atomic.skb);
if (rc) {
pr_err("Failed resending result. This flow is not handled - skb ignored\n");
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;
}
}
static void rxe_drain_req_pkts(struct rxe_qp *qp, bool notify)
{
struct sk_buff *skb;
while ((skb = skb_dequeue(&qp->req_pkts))) {
rxe_drop_ref(qp);
kfree_skb(skb);
}
if (notify)
return;
while (!qp->srq && qp->rq.queue && queue_head(qp->rq.queue))
advance_consumer(qp->rq.queue);
}
int rxe_responder(void *arg)
{
struct rxe_qp *qp = (struct rxe_qp *)arg;
struct rxe_dev *rxe = to_rdev(qp->ibqp.device);
enum resp_states state;
struct rxe_pkt_info *pkt = NULL;
int ret = 0;
rxe_add_ref(qp);
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("qp#%d state = %s\n", qp_num(qp),
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) {
rxe_counter_inc(rxe, RXE_CNT_SND_RNR);
/* 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:
rxe_drain_req_pkts(qp, false);
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_ONCE(1);
}
}
exit:
ret = -EAGAIN;
done:
rxe_drop_ref(qp);
return ret;
}
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