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RDMA/siw: Fix handling of zero-sized Read and Receive Queues.
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[ Upstream commit 661f385 ]

During connection setup, the application may choose to zero-size inbound
and outbound READ queues, as well as the Receive queue.  This patch fixes
handling of zero-sized queues, but not prevents it.

Kamal Heib says in an initial error report:

 When running the blktests over siw the following shift-out-of-bounds is
 reported, this is happening because the passed IRD or ORD from the ulp
 could be zero which will lead to unexpected behavior when calling
 roundup_pow_of_two(), fix that by blocking zero values of ORD or IRD.

   UBSAN: shift-out-of-bounds in ./include/linux/log2.h:57:13
   shift exponent 64 is too large for 64-bit type 'long unsigned int'
   CPU: 20 PID: 3957 Comm: kworker/u64:13 Tainted: G S     5.10.0-rc6 #2
   Hardware name: Dell Inc. PowerEdge R630/02C2CP, BIOS 2.1.5 04/11/2016
   Workqueue: iw_cm_wq cm_work_handler [iw_cm]
   Call Trace:
    dump_stack+0x99/0xcb
    ubsan_epilogue+0x5/0x40
    __ubsan_handle_shift_out_of_bounds.cold.11+0xb4/0xf3
    ? down_write+0x183/0x3d0
    siw_qp_modify.cold.8+0x2d/0x32 [siw]
    ? __local_bh_enable_ip+0xa5/0xf0
    siw_accept+0x906/0x1b60 [siw]
    ? xa_load+0x147/0x1f0
    ? siw_connect+0x17a0/0x17a0 [siw]
    ? lock_downgrade+0x700/0x700
    ? siw_get_base_qp+0x1c2/0x340 [siw]
    ? _raw_spin_unlock_irqrestore+0x39/0x40
    iw_cm_accept+0x1f4/0x430 [iw_cm]
    rdma_accept+0x3fa/0xb10 [rdma_cm]
    ? check_flush_dependency+0x410/0x410
    ? cma_rep_recv+0x570/0x570 [rdma_cm]
    nvmet_rdma_queue_connect+0x1a62/0x2680 [nvmet_rdma]
    ? nvmet_rdma_alloc_cmds+0xce0/0xce0 [nvmet_rdma]
    ? lock_release+0x56e/0xcc0
    ? lock_downgrade+0x700/0x700
    ? lock_downgrade+0x700/0x700
    ? __xa_alloc_cyclic+0xef/0x350
    ? __xa_alloc+0x2d0/0x2d0
    ? rdma_restrack_add+0xbe/0x2c0 [ib_core]
    ? __ww_mutex_die+0x190/0x190
    cma_cm_event_handler+0xf2/0x500 [rdma_cm]
    iw_conn_req_handler+0x910/0xcb0 [rdma_cm]
    ? _raw_spin_unlock_irqrestore+0x39/0x40
    ? trace_hardirqs_on+0x1c/0x150
    ? cma_ib_handler+0x8a0/0x8a0 [rdma_cm]
    ? __kasan_kmalloc.constprop.7+0xc1/0xd0
    cm_work_handler+0x121c/0x17a0 [iw_cm]
    ? iw_cm_reject+0x190/0x190 [iw_cm]
    ? trace_hardirqs_on+0x1c/0x150
    process_one_work+0x8fb/0x16c0
    ? pwq_dec_nr_in_flight+0x320/0x320
    worker_thread+0x87/0xb40
    ? __kthread_parkme+0xd1/0x1a0
    ? process_one_work+0x16c0/0x16c0
    kthread+0x35f/0x430
    ? kthread_mod_delayed_work+0x180/0x180
    ret_from_fork+0x22/0x30

Fixes: a531975 ("rdma/siw: main include file")
Fixes: f29dd55 ("rdma/siw: queue pair methods")
Fixes: 8b6a361 ("rdma/siw: receive path")
Fixes: b9be6f1 ("rdma/siw: transmit path")
Fixes: 303ae1c ("rdma/siw: application interface")
Link: https://lore.kernel.org/r/20210108125845.1803-1-bmt@zurich.ibm.com
Reported-by: Kamal Heib <kamalheib1@gmail.com>
Reported-by: Yi Zhang <yi.zhang@redhat.com>
Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Bernard Metzler <bmt@zurich.ibm.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
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@BernardMetzler @gregkh
BernardMetzler authored and gregkh committed Mar 4, 2021
1 parent d7704a6 commit a146122
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Showing 5 changed files with 177 additions and 146 deletions.
2 changes: 1 addition & 1 deletion drivers/infiniband/sw/siw/siw.h
View file
Expand Up @@ -653,7 +653,7 @@ static inline struct siw_sqe *orq_get_free(struct siw_qp *qp)
{
struct siw_sqe *orq_e = orq_get_tail(qp);

if (orq_e && READ_ONCE(orq_e->flags) == 0)
if (READ_ONCE(orq_e->flags) == 0)
return orq_e;

return NULL;
Expand Down
271 changes: 142 additions & 129 deletions drivers/infiniband/sw/siw/siw_qp.c
View file
Expand Up @@ -199,26 +199,26 @@ void siw_qp_llp_write_space(struct sock *sk)

static int siw_qp_readq_init(struct siw_qp *qp, int irq_size, int orq_size)
{
irq_size = roundup_pow_of_two(irq_size);
orq_size = roundup_pow_of_two(orq_size);

qp->attrs.irq_size = irq_size;
qp->attrs.orq_size = orq_size;

qp->irq = vzalloc(irq_size * sizeof(struct siw_sqe));
if (!qp->irq) {
siw_dbg_qp(qp, "irq malloc for %d failed\n", irq_size);
qp->attrs.irq_size = 0;
return -ENOMEM;
if (irq_size) {
irq_size = roundup_pow_of_two(irq_size);
qp->irq = vzalloc(irq_size * sizeof(struct siw_sqe));
if (!qp->irq) {
qp->attrs.irq_size = 0;
return -ENOMEM;
}
}
qp->orq = vzalloc(orq_size * sizeof(struct siw_sqe));
if (!qp->orq) {
siw_dbg_qp(qp, "orq malloc for %d failed\n", orq_size);
qp->attrs.orq_size = 0;
qp->attrs.irq_size = 0;
vfree(qp->irq);
return -ENOMEM;
if (orq_size) {
orq_size = roundup_pow_of_two(orq_size);
qp->orq = vzalloc(orq_size * sizeof(struct siw_sqe));
if (!qp->orq) {
qp->attrs.orq_size = 0;
qp->attrs.irq_size = 0;
vfree(qp->irq);
return -ENOMEM;
}
}
qp->attrs.irq_size = irq_size;
qp->attrs.orq_size = orq_size;
siw_dbg_qp(qp, "ORD %d, IRD %d\n", orq_size, irq_size);
return 0;
}
Expand Down Expand Up @@ -288,13 +288,14 @@ int siw_qp_mpa_rts(struct siw_qp *qp, enum mpa_v2_ctrl ctrl)
if (ctrl & MPA_V2_RDMA_WRITE_RTR)
wqe->sqe.opcode = SIW_OP_WRITE;
else if (ctrl & MPA_V2_RDMA_READ_RTR) {
struct siw_sqe *rreq;
struct siw_sqe *rreq = NULL;

wqe->sqe.opcode = SIW_OP_READ;

spin_lock(&qp->orq_lock);

rreq = orq_get_free(qp);
if (qp->attrs.orq_size)
rreq = orq_get_free(qp);
if (rreq) {
siw_read_to_orq(rreq, &wqe->sqe);
qp->orq_put++;
Expand Down Expand Up @@ -877,135 +878,88 @@ void siw_read_to_orq(struct siw_sqe *rreq, struct siw_sqe *sqe)
rreq->num_sge = 1;
}

/*
* Must be called with SQ locked.
* To avoid complete SQ starvation by constant inbound READ requests,
* the active IRQ will not be served after qp->irq_burst, if the
* SQ has pending work.
*/
int siw_activate_tx(struct siw_qp *qp)
static int siw_activate_tx_from_sq(struct siw_qp *qp)
{
struct siw_sqe *irqe, *sqe;
struct siw_sqe *sqe;
struct siw_wqe *wqe = tx_wqe(qp);
int rv = 1;

irqe = &qp->irq[qp->irq_get % qp->attrs.irq_size];

if (irqe->flags & SIW_WQE_VALID) {
sqe = sq_get_next(qp);

/*
* Avoid local WQE processing starvation in case
* of constant inbound READ request stream
*/
if (sqe && ++qp->irq_burst >= SIW_IRQ_MAXBURST_SQ_ACTIVE) {
qp->irq_burst = 0;
goto skip_irq;
}
memset(wqe->mem, 0, sizeof(*wqe->mem) * SIW_MAX_SGE);
wqe->wr_status = SIW_WR_QUEUED;

/* start READ RESPONSE */
wqe->sqe.opcode = SIW_OP_READ_RESPONSE;
wqe->sqe.flags = 0;
if (irqe->num_sge) {
wqe->sqe.num_sge = 1;
wqe->sqe.sge[0].length = irqe->sge[0].length;
wqe->sqe.sge[0].laddr = irqe->sge[0].laddr;
wqe->sqe.sge[0].lkey = irqe->sge[0].lkey;
} else {
wqe->sqe.num_sge = 0;
}

/* Retain original RREQ's message sequence number for
* potential error reporting cases.
*/
wqe->sqe.sge[1].length = irqe->sge[1].length;

wqe->sqe.rkey = irqe->rkey;
wqe->sqe.raddr = irqe->raddr;
sqe = sq_get_next(qp);
if (!sqe)
return 0;

wqe->processed = 0;
qp->irq_get++;
memset(wqe->mem, 0, sizeof(*wqe->mem) * SIW_MAX_SGE);
wqe->wr_status = SIW_WR_QUEUED;

/* mark current IRQ entry free */
smp_store_mb(irqe->flags, 0);
/* First copy SQE to kernel private memory */
memcpy(&wqe->sqe, sqe, sizeof(*sqe));

if (wqe->sqe.opcode >= SIW_NUM_OPCODES) {
rv = -EINVAL;
goto out;
}
sqe = sq_get_next(qp);
if (sqe) {
skip_irq:
memset(wqe->mem, 0, sizeof(*wqe->mem) * SIW_MAX_SGE);
wqe->wr_status = SIW_WR_QUEUED;

/* First copy SQE to kernel private memory */
memcpy(&wqe->sqe, sqe, sizeof(*sqe));

if (wqe->sqe.opcode >= SIW_NUM_OPCODES) {
if (wqe->sqe.flags & SIW_WQE_INLINE) {
if (wqe->sqe.opcode != SIW_OP_SEND &&
wqe->sqe.opcode != SIW_OP_WRITE) {
rv = -EINVAL;
goto out;
}
if (wqe->sqe.flags & SIW_WQE_INLINE) {
if (wqe->sqe.opcode != SIW_OP_SEND &&
wqe->sqe.opcode != SIW_OP_WRITE) {
rv = -EINVAL;
goto out;
}
if (wqe->sqe.sge[0].length > SIW_MAX_INLINE) {
rv = -EINVAL;
goto out;
}
wqe->sqe.sge[0].laddr = (uintptr_t)&wqe->sqe.sge[1];
wqe->sqe.sge[0].lkey = 0;
wqe->sqe.num_sge = 1;
if (wqe->sqe.sge[0].length > SIW_MAX_INLINE) {
rv = -EINVAL;
goto out;
}
if (wqe->sqe.flags & SIW_WQE_READ_FENCE) {
/* A READ cannot be fenced */
if (unlikely(wqe->sqe.opcode == SIW_OP_READ ||
wqe->sqe.opcode ==
SIW_OP_READ_LOCAL_INV)) {
siw_dbg_qp(qp, "cannot fence read\n");
rv = -EINVAL;
goto out;
}
spin_lock(&qp->orq_lock);
wqe->sqe.sge[0].laddr = (uintptr_t)&wqe->sqe.sge[1];
wqe->sqe.sge[0].lkey = 0;
wqe->sqe.num_sge = 1;
}
if (wqe->sqe.flags & SIW_WQE_READ_FENCE) {
/* A READ cannot be fenced */
if (unlikely(wqe->sqe.opcode == SIW_OP_READ ||
wqe->sqe.opcode ==
SIW_OP_READ_LOCAL_INV)) {
siw_dbg_qp(qp, "cannot fence read\n");
rv = -EINVAL;
goto out;
}
spin_lock(&qp->orq_lock);

if (!siw_orq_empty(qp)) {
qp->tx_ctx.orq_fence = 1;
rv = 0;
}
spin_unlock(&qp->orq_lock);
if (qp->attrs.orq_size && !siw_orq_empty(qp)) {
qp->tx_ctx.orq_fence = 1;
rv = 0;
}
spin_unlock(&qp->orq_lock);

} else if (wqe->sqe.opcode == SIW_OP_READ ||
wqe->sqe.opcode == SIW_OP_READ_LOCAL_INV) {
struct siw_sqe *rreq;
} else if (wqe->sqe.opcode == SIW_OP_READ ||
wqe->sqe.opcode == SIW_OP_READ_LOCAL_INV) {
struct siw_sqe *rreq;

wqe->sqe.num_sge = 1;
if (unlikely(!qp->attrs.orq_size)) {
/* We negotiated not to send READ req's */
rv = -EINVAL;
goto out;
}
wqe->sqe.num_sge = 1;

spin_lock(&qp->orq_lock);
spin_lock(&qp->orq_lock);

rreq = orq_get_free(qp);
if (rreq) {
/*
* Make an immediate copy in ORQ to be ready
* to process loopback READ reply
*/
siw_read_to_orq(rreq, &wqe->sqe);
qp->orq_put++;
} else {
qp->tx_ctx.orq_fence = 1;
rv = 0;
}
spin_unlock(&qp->orq_lock);
rreq = orq_get_free(qp);
if (rreq) {
/*
* Make an immediate copy in ORQ to be ready
* to process loopback READ reply
*/
siw_read_to_orq(rreq, &wqe->sqe);
qp->orq_put++;
} else {
qp->tx_ctx.orq_fence = 1;
rv = 0;
}

/* Clear SQE, can be re-used by application */
smp_store_mb(sqe->flags, 0);
qp->sq_get++;
} else {
rv = 0;
spin_unlock(&qp->orq_lock);
}

/* Clear SQE, can be re-used by application */
smp_store_mb(sqe->flags, 0);
qp->sq_get++;
out:
if (unlikely(rv < 0)) {
siw_dbg_qp(qp, "error %d\n", rv);
Expand All @@ -1014,6 +968,65 @@ int siw_activate_tx(struct siw_qp *qp)
return rv;
}

/*
* Must be called with SQ locked.
* To avoid complete SQ starvation by constant inbound READ requests,
* the active IRQ will not be served after qp->irq_burst, if the
* SQ has pending work.
*/
int siw_activate_tx(struct siw_qp *qp)
{
struct siw_sqe *irqe;
struct siw_wqe *wqe = tx_wqe(qp);

if (!qp->attrs.irq_size)
return siw_activate_tx_from_sq(qp);

irqe = &qp->irq[qp->irq_get % qp->attrs.irq_size];

if (!(irqe->flags & SIW_WQE_VALID))
return siw_activate_tx_from_sq(qp);

/*
* Avoid local WQE processing starvation in case
* of constant inbound READ request stream
*/
if (sq_get_next(qp) && ++qp->irq_burst >= SIW_IRQ_MAXBURST_SQ_ACTIVE) {
qp->irq_burst = 0;
return siw_activate_tx_from_sq(qp);
}
memset(wqe->mem, 0, sizeof(*wqe->mem) * SIW_MAX_SGE);
wqe->wr_status = SIW_WR_QUEUED;

/* start READ RESPONSE */
wqe->sqe.opcode = SIW_OP_READ_RESPONSE;
wqe->sqe.flags = 0;
if (irqe->num_sge) {
wqe->sqe.num_sge = 1;
wqe->sqe.sge[0].length = irqe->sge[0].length;
wqe->sqe.sge[0].laddr = irqe->sge[0].laddr;
wqe->sqe.sge[0].lkey = irqe->sge[0].lkey;
} else {
wqe->sqe.num_sge = 0;
}

/* Retain original RREQ's message sequence number for
* potential error reporting cases.
*/
wqe->sqe.sge[1].length = irqe->sge[1].length;

wqe->sqe.rkey = irqe->rkey;
wqe->sqe.raddr = irqe->raddr;

wqe->processed = 0;
qp->irq_get++;

/* mark current IRQ entry free */
smp_store_mb(irqe->flags, 0);

return 1;
}

/*
* Check if current CQ state qualifies for calling CQ completion
* handler. Must be called with CQ lock held.
Expand Down
26 changes: 18 additions & 8 deletions drivers/infiniband/sw/siw/siw_qp_rx.c
View file
Expand Up @@ -680,6 +680,10 @@ static int siw_init_rresp(struct siw_qp *qp, struct siw_rx_stream *srx)
}
spin_lock_irqsave(&qp->sq_lock, flags);

if (unlikely(!qp->attrs.irq_size)) {
run_sq = 0;
goto error_irq;
}
if (tx_work->wr_status == SIW_WR_IDLE) {
/*
* immediately schedule READ response w/o
Expand Down Expand Up @@ -712,8 +716,9 @@ static int siw_init_rresp(struct siw_qp *qp, struct siw_rx_stream *srx)
/* RRESP now valid as current TX wqe or placed into IRQ */
smp_store_mb(resp->flags, SIW_WQE_VALID);
} else {
pr_warn("siw: [QP %u]: irq %d exceeded %d\n", qp_id(qp),
qp->irq_put % qp->attrs.irq_size, qp->attrs.irq_size);
error_irq:
pr_warn("siw: [QP %u]: IRQ exceeded or null, size %d\n",
qp_id(qp), qp->attrs.irq_size);

siw_init_terminate(qp, TERM_ERROR_LAYER_RDMAP,
RDMAP_ETYPE_REMOTE_OPERATION,
Expand All @@ -740,6 +745,9 @@ static int siw_orqe_start_rx(struct siw_qp *qp)
struct siw_sqe *orqe;
struct siw_wqe *wqe = NULL;

if (unlikely(!qp->attrs.orq_size))
return -EPROTO;

/* make sure ORQ indices are current */
smp_mb();

Expand Down Expand Up @@ -796,8 +804,8 @@ int siw_proc_rresp(struct siw_qp *qp)
*/
rv = siw_orqe_start_rx(qp);
if (rv) {
pr_warn("siw: [QP %u]: ORQ empty at idx %d\n",
qp_id(qp), qp->orq_get % qp->attrs.orq_size);
pr_warn("siw: [QP %u]: ORQ empty, size %d\n",
qp_id(qp), qp->attrs.orq_size);
goto error_term;
}
rv = siw_rresp_check_ntoh(srx, frx);
Expand Down Expand Up @@ -1290,11 +1298,13 @@ static int siw_rdmap_complete(struct siw_qp *qp, int error)
wc_status);
siw_wqe_put_mem(wqe, SIW_OP_READ);

if (!error)
if (!error) {
rv = siw_check_tx_fence(qp);
else
/* Disable current ORQ eleement */
WRITE_ONCE(orq_get_current(qp)->flags, 0);
} else {
/* Disable current ORQ element */
if (qp->attrs.orq_size)
WRITE_ONCE(orq_get_current(qp)->flags, 0);
}
break;

case RDMAP_RDMA_READ_REQ:
Expand Down

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