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rxe_resp.c
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rxe_resp.c
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// SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB
/*
* Copyright (c) 2016 Mellanox Technologies Ltd. All rights reserved.
* Copyright (c) 2015 System Fabric Works, Inc. All rights reserved.
*/
#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_ATOMIC_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_INVALIDATE_RKEY,
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_ATOMIC_REPLY] = "ATOMIC_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_INVALIDATE_RKEY] = "ERR_INVALIDATE_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);
if (must_sched)
rxe_sched_task(&qp->resp.task);
else
rxe_run_task(&qp->resp.task);
}
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_put(qp);
kfree_skb(skb);
ib_device_put(qp->ibqp.device);
}
/* 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_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;
unsigned int count;
size_t size;
unsigned long flags;
if (srq->error)
return RESPST_ERR_RNR;
spin_lock_irqsave(&srq->rq.consumer_lock, flags);
wqe = queue_head(q, QUEUE_TYPE_FROM_CLIENT);
if (!wqe) {
spin_unlock_irqrestore(&srq->rq.consumer_lock, flags);
return RESPST_ERR_RNR;
}
/* don't trust user space data */
if (unlikely(wqe->dma.num_sge > srq->rq.max_sge)) {
spin_unlock_irqrestore(&srq->rq.consumer_lock, flags);
pr_warn("%s: invalid num_sge in SRQ entry\n", __func__);
return RESPST_ERR_MALFORMED_WQE;
}
size = sizeof(*wqe) + wqe->dma.num_sge*sizeof(struct rxe_sge);
memcpy(&qp->resp.srq_wqe, wqe, size);
qp->resp.wqe = &qp->resp.srq_wqe.wqe;
queue_advance_consumer(q, QUEUE_TYPE_FROM_CLIENT);
count = queue_count(q, QUEUE_TYPE_FROM_CLIENT);
if (srq->limit && srq->ibsrq.event_handler && (count < srq->limit)) {
srq->limit = 0;
goto event;
}
spin_unlock_irqrestore(&srq->rq.consumer_lock, flags);
return RESPST_CHK_LENGTH;
event:
spin_unlock_irqrestore(&srq->rq.consumer_lock, flags);
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,
QUEUE_TYPE_FROM_CLIENT);
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_MASK) {
/* 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,
QUEUE_TYPE_FROM_CLIENT);
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_mr *mr = NULL;
struct rxe_mw *mw = NULL;
u64 va;
u32 rkey;
u32 resid;
u32 pktlen;
int mtu = qp->mtu;
enum resp_states state;
int access;
if (pkt->mask & RXE_READ_OR_WRITE_MASK) {
if (pkt->mask & RXE_RETH_MASK) {
qp->resp.va = reth_va(pkt);
qp->resp.offset = 0;
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.offset = 0;
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_OR_WRITE_MASK) &&
(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);
if (rkey_is_mw(rkey)) {
mw = rxe_lookup_mw(qp, access, rkey);
if (!mw) {
pr_debug("%s: no MW matches rkey %#x\n",
__func__, rkey);
state = RESPST_ERR_RKEY_VIOLATION;
goto err;
}
mr = mw->mr;
if (!mr) {
pr_err("%s: MW doesn't have an MR\n", __func__);
state = RESPST_ERR_RKEY_VIOLATION;
goto err;
}
if (mw->access & IB_ZERO_BASED)
qp->resp.offset = mw->addr;
rxe_get(mr);
rxe_put(mw);
mw = NULL;
} else {
mr = lookup_mr(qp->pd, access, rkey, RXE_LOOKUP_REMOTE);
if (!mr) {
pr_debug("%s: no MR matches rkey %#x\n",
__func__, rkey);
state = RESPST_ERR_RKEY_VIOLATION;
goto err;
}
}
if (mr_check_range(mr, va + qp->resp.offset, 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 = mr;
return RESPST_EXECUTE;
err:
if (mr)
rxe_put(mr);
if (mw)
rxe_put(mw);
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, RXE_TO_MR_OBJ);
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_mr_copy(qp->resp.mr, qp->resp.va + qp->resp.offset,
payload_addr(pkt), data_len, RXE_TO_MR_OBJ);
if (err) {
rc = RESPST_ERR_RKEY_VIOLATION;
goto out;
}
qp->resp.va += data_len;
qp->resp.resid -= data_len;
out:
return rc;
}
static struct resp_res *rxe_prepare_res(struct rxe_qp *qp,
struct rxe_pkt_info *pkt,
int type)
{
struct resp_res *res;
u32 pkts;
res = &qp->resp.resources[qp->resp.res_head];
rxe_advance_resp_resource(qp);
free_rd_atomic_resource(res);
res->type = type;
res->replay = 0;
switch (type) {
case RXE_READ_MASK:
res->read.va = qp->resp.va + qp->resp.offset;
res->read.va_org = qp->resp.va + qp->resp.offset;
res->read.resid = qp->resp.resid;
res->read.length = qp->resp.resid;
res->read.rkey = qp->resp.rkey;
pkts = max_t(u32, (reth_len(pkt) + qp->mtu - 1)/qp->mtu, 1);
res->first_psn = pkt->psn;
res->cur_psn = pkt->psn;
res->last_psn = (pkt->psn + pkts - 1) & BTH_PSN_MASK;
res->state = rdatm_res_state_new;
break;
case RXE_ATOMIC_MASK:
res->first_psn = pkt->psn;
res->last_psn = pkt->psn;
res->cur_psn = pkt->psn;
break;
}
return res;
}
/* Guarantee atomicity of atomic operations at the machine level. */
static DEFINE_SPINLOCK(atomic_ops_lock);
static enum resp_states atomic_reply(struct rxe_qp *qp,
struct rxe_pkt_info *pkt)
{
u64 *vaddr;
enum resp_states ret;
struct rxe_mr *mr = qp->resp.mr;
struct resp_res *res = qp->resp.res;
u64 value;
if (!res) {
res = rxe_prepare_res(qp, pkt, RXE_ATOMIC_MASK);
qp->resp.res = res;
}
if (!res->replay) {
if (mr->state != RXE_MR_STATE_VALID) {
ret = RESPST_ERR_RKEY_VIOLATION;
goto out;
}
vaddr = iova_to_vaddr(mr, qp->resp.va + qp->resp.offset,
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);
res->atomic.orig_val = value = *vaddr;
if (pkt->opcode == IB_OPCODE_RC_COMPARE_SWAP) {
if (value == atmeth_comp(pkt))
value = atmeth_swap_add(pkt);
} else {
value += atmeth_swap_add(pkt);
}
*vaddr = value;
spin_unlock_bh(&atomic_ops_lock);
qp->resp.msn++;
/* 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;
}
ret = RESPST_ACKNOWLEDGE;
out:
return ret;
}
static struct sk_buff *prepare_ack_packet(struct rxe_qp *qp,
struct rxe_pkt_info *ack,
int opcode,
int payload,
u32 psn,
u8 syndrome)
{
struct rxe_dev *rxe = to_rdev(qp->ibqp.device);
struct sk_buff *skb;
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->paylen = paylen;
ack->psn = psn;
bth_init(ack, opcode, 0, 0, pad, IB_DEFAULT_PKEY_FULL,
qp->attr.dest_qp_num, 0, 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.res->atomic.orig_val);
err = rxe_prepare(&qp->pri_av, ack, skb);
if (err) {
kfree_skb(skb);
return NULL;
}
return skb;
}
/**
* rxe_recheck_mr - revalidate MR from rkey and get a reference
* @qp: the qp
* @rkey: the rkey
*
* This code allows the MR to be invalidated or deregistered or
* the MW if one was used to be invalidated or deallocated.
* It is assumed that the access permissions if originally good
* are OK and the mappings to be unchanged.
*
* TODO: If someone reregisters an MR to change its size or
* access permissions during the processing of an RDMA read
* we should kill the responder resource and complete the
* operation with an error.
*
* Return: mr on success else NULL
*/
static struct rxe_mr *rxe_recheck_mr(struct rxe_qp *qp, u32 rkey)
{
struct rxe_dev *rxe = to_rdev(qp->ibqp.device);
struct rxe_mr *mr;
struct rxe_mw *mw;
if (rkey_is_mw(rkey)) {
mw = rxe_pool_get_index(&rxe->mw_pool, rkey >> 8);
if (!mw)
return NULL;
mr = mw->mr;
if (mw->rkey != rkey || mw->state != RXE_MW_STATE_VALID ||
!mr || mr->state != RXE_MR_STATE_VALID) {
rxe_put(mw);
return NULL;
}
rxe_get(mr);
rxe_put(mw);
return mr;
}
mr = rxe_pool_get_index(&rxe->mr_pool, rkey >> 8);
if (!mr)
return NULL;
if (mr->rkey != rkey || mr->state != RXE_MR_STATE_VALID) {
rxe_put(mr);
return NULL;
}
return mr;
}
/* 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;
struct rxe_mr *mr;
if (!res) {
res = rxe_prepare_res(qp, req_pkt, RXE_READ_MASK);
qp->resp.res = res;
}
if (res->state == rdatm_res_state_new) {
if (!res->replay) {
mr = qp->resp.mr;
qp->resp.mr = NULL;
} else {
mr = rxe_recheck_mr(qp, res->read.rkey);
if (!mr)
return RESPST_ERR_RKEY_VIOLATION;
}
if (res->read.resid <= mtu)
opcode = IB_OPCODE_RC_RDMA_READ_RESPONSE_ONLY;
else
opcode = IB_OPCODE_RC_RDMA_READ_RESPONSE_FIRST;
} else {
mr = rxe_recheck_mr(qp, res->read.rkey);
if (!mr)
return RESPST_ERR_RKEY_VIOLATION;
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, &ack_pkt, opcode, payload,
res->cur_psn, AETH_ACK_UNLIMITED);
if (!skb) {
rxe_put(mr);
return RESPST_ERR_RNR;
}
rxe_mr_copy(mr, res->read.va, payload_addr(&ack_pkt),
payload, RXE_FROM_MR_OBJ);
if (mr)
rxe_put(mr);
if (bth_pad(&ack_pkt)) {
u8 *pad = payload_addr(&ack_pkt) + payload;
memset(pad, 0, bth_pad(&ack_pkt));
}
err = rxe_xmit_packet(qp, &ack_pkt, skb);
if (err)
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 int invalidate_rkey(struct rxe_qp *qp, u32 rkey)
{
if (rkey_is_mw(rkey))
return rxe_invalidate_mw(qp, rkey);
else
return rxe_invalidate_mr(qp, rkey);
}
/* 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;
struct sk_buff *skb = PKT_TO_SKB(pkt);
union rdma_network_hdr hdr;
if (pkt->mask & RXE_SEND_MASK) {
if (qp_type(qp) == IB_QPT_UD ||
qp_type(qp) == IB_QPT_GSI) {
if (skb->protocol == htons(ETH_P_IP)) {
memset(&hdr.reserved, 0,
sizeof(hdr.reserved));
memcpy(&hdr.roce4grh, ip_hdr(skb),
sizeof(hdr.roce4grh));
err = send_data_in(qp, &hdr, sizeof(hdr));
} else {
err = send_data_in(qp, ipv6_hdr(skb),
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) {
return RESPST_ATOMIC_REPLY;
} else {
/* Unreachable */
WARN_ON_ONCE(1);
}
if (pkt->mask & RXE_IETH_MASK) {
u32 rkey = ieth_rkey(pkt);
err = invalidate_rkey(qp, rkey);
if (err)
return RESPST_ERR_INVALIDATE_RKEY;
}
if (pkt->mask & RXE_END_MASK)
/* 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.ack_psn = qp->resp.psn;
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;
struct rxe_dev *rxe = to_rdev(qp->ibqp.device);
if (!wqe)
goto finish;
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->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);
}
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);
}