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linux-zen-server/drivers/infiniband/hw/hfi1/ud.c

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// SPDX-License-Identifier: GPL-2.0 or BSD-3-Clause
/*
* Copyright(c) 2015 - 2019 Intel Corporation.
*/
#include <linux/net.h>
#include <rdma/ib_smi.h>
#include "hfi.h"
#include "mad.h"
#include "verbs_txreq.h"
#include "trace_ibhdrs.h"
#include "qp.h"
/* We support only two types - 9B and 16B for now */
static const hfi1_make_req hfi1_make_ud_req_tbl[2] = {
[HFI1_PKT_TYPE_9B] = &hfi1_make_ud_req_9B,
[HFI1_PKT_TYPE_16B] = &hfi1_make_ud_req_16B
};
/**
* ud_loopback - handle send on loopback QPs
* @sqp: the sending QP
* @swqe: the send work request
*
* This is called from hfi1_make_ud_req() to forward a WQE addressed
* to the same HFI.
* Note that the receive interrupt handler may be calling hfi1_ud_rcv()
* while this is being called.
*/
static void ud_loopback(struct rvt_qp *sqp, struct rvt_swqe *swqe)
{
struct hfi1_ibport *ibp = to_iport(sqp->ibqp.device, sqp->port_num);
struct hfi1_pportdata *ppd;
struct hfi1_qp_priv *priv = sqp->priv;
struct rvt_qp *qp;
struct rdma_ah_attr *ah_attr;
unsigned long flags;
struct rvt_sge_state ssge;
struct rvt_sge *sge;
struct ib_wc wc;
u32 length;
enum ib_qp_type sqptype, dqptype;
rcu_read_lock();
qp = rvt_lookup_qpn(ib_to_rvt(sqp->ibqp.device), &ibp->rvp,
rvt_get_swqe_remote_qpn(swqe));
if (!qp) {
ibp->rvp.n_pkt_drops++;
rcu_read_unlock();
return;
}
sqptype = sqp->ibqp.qp_type == IB_QPT_GSI ?
IB_QPT_UD : sqp->ibqp.qp_type;
dqptype = qp->ibqp.qp_type == IB_QPT_GSI ?
IB_QPT_UD : qp->ibqp.qp_type;
if (dqptype != sqptype ||
!(ib_rvt_state_ops[qp->state] & RVT_PROCESS_RECV_OK)) {
ibp->rvp.n_pkt_drops++;
goto drop;
}
ah_attr = rvt_get_swqe_ah_attr(swqe);
ppd = ppd_from_ibp(ibp);
if (qp->ibqp.qp_num > 1) {
u16 pkey;
u32 slid;
u8 sc5 = ibp->sl_to_sc[rdma_ah_get_sl(ah_attr)];
pkey = hfi1_get_pkey(ibp, sqp->s_pkey_index);
slid = ppd->lid | (rdma_ah_get_path_bits(ah_attr) &
((1 << ppd->lmc) - 1));
if (unlikely(ingress_pkey_check(ppd, pkey, sc5,
qp->s_pkey_index,
slid, false))) {
hfi1_bad_pkey(ibp, pkey,
rdma_ah_get_sl(ah_attr),
sqp->ibqp.qp_num, qp->ibqp.qp_num,
slid, rdma_ah_get_dlid(ah_attr));
goto drop;
}
}
/*
* Check that the qkey matches (except for QP0, see 9.6.1.4.1).
* Qkeys with the high order bit set mean use the
* qkey from the QP context instead of the WR (see 10.2.5).
*/
if (qp->ibqp.qp_num) {
u32 qkey;
qkey = (int)rvt_get_swqe_remote_qkey(swqe) < 0 ?
sqp->qkey : rvt_get_swqe_remote_qkey(swqe);
if (unlikely(qkey != qp->qkey))
goto drop; /* silently drop per IBTA spec */
}
/*
* A GRH is expected to precede the data even if not
* present on the wire.
*/
length = swqe->length;
memset(&wc, 0, sizeof(wc));
wc.byte_len = length + sizeof(struct ib_grh);
if (swqe->wr.opcode == IB_WR_SEND_WITH_IMM) {
wc.wc_flags = IB_WC_WITH_IMM;
wc.ex.imm_data = swqe->wr.ex.imm_data;
}
spin_lock_irqsave(&qp->r_lock, flags);
/*
* Get the next work request entry to find where to put the data.
*/
if (qp->r_flags & RVT_R_REUSE_SGE) {
qp->r_flags &= ~RVT_R_REUSE_SGE;
} else {
int ret;
ret = rvt_get_rwqe(qp, false);
if (ret < 0) {
rvt_rc_error(qp, IB_WC_LOC_QP_OP_ERR);
goto bail_unlock;
}
if (!ret) {
if (qp->ibqp.qp_num == 0)
ibp->rvp.n_vl15_dropped++;
goto bail_unlock;
}
}
/* Silently drop packets which are too big. */
if (unlikely(wc.byte_len > qp->r_len)) {
qp->r_flags |= RVT_R_REUSE_SGE;
ibp->rvp.n_pkt_drops++;
goto bail_unlock;
}
if (rdma_ah_get_ah_flags(ah_attr) & IB_AH_GRH) {
struct ib_grh grh;
struct ib_global_route grd = *(rdma_ah_read_grh(ah_attr));
/*
* For loopback packets with extended LIDs, the
* sgid_index in the GRH is 0 and the dgid is
* OPA GID of the sender. While creating a response
* to the loopback packet, IB core creates the new
* sgid_index from the DGID and that will be the
* OPA_GID_INDEX. The new dgid is from the sgid
* index and that will be in the IB GID format.
*
* We now have a case where the sent packet had a
* different sgid_index and dgid compared to the
* one that was received in response.
*
* Fix this inconsistency.
*/
if (priv->hdr_type == HFI1_PKT_TYPE_16B) {
if (grd.sgid_index == 0)
grd.sgid_index = OPA_GID_INDEX;
if (ib_is_opa_gid(&grd.dgid))
grd.dgid.global.interface_id =
cpu_to_be64(ppd->guids[HFI1_PORT_GUID_INDEX]);
}
hfi1_make_grh(ibp, &grh, &grd, 0, 0);
rvt_copy_sge(qp, &qp->r_sge, &grh,
sizeof(grh), true, false);
wc.wc_flags |= IB_WC_GRH;
} else {
rvt_skip_sge(&qp->r_sge, sizeof(struct ib_grh), true);
}
ssge.sg_list = swqe->sg_list + 1;
ssge.sge = *swqe->sg_list;
ssge.num_sge = swqe->wr.num_sge;
sge = &ssge.sge;
while (length) {
u32 len = rvt_get_sge_length(sge, length);
WARN_ON_ONCE(len == 0);
rvt_copy_sge(qp, &qp->r_sge, sge->vaddr, len, true, false);
rvt_update_sge(&ssge, len, false);
length -= len;
}
rvt_put_ss(&qp->r_sge);
if (!test_and_clear_bit(RVT_R_WRID_VALID, &qp->r_aflags))
goto bail_unlock;
wc.wr_id = qp->r_wr_id;
wc.status = IB_WC_SUCCESS;
wc.opcode = IB_WC_RECV;
wc.qp = &qp->ibqp;
wc.src_qp = sqp->ibqp.qp_num;
if (qp->ibqp.qp_type == IB_QPT_GSI || qp->ibqp.qp_type == IB_QPT_SMI) {
if (sqp->ibqp.qp_type == IB_QPT_GSI ||
sqp->ibqp.qp_type == IB_QPT_SMI)
wc.pkey_index = rvt_get_swqe_pkey_index(swqe);
else
wc.pkey_index = sqp->s_pkey_index;
} else {
wc.pkey_index = 0;
}
wc.slid = (ppd->lid | (rdma_ah_get_path_bits(ah_attr) &
((1 << ppd->lmc) - 1))) & U16_MAX;
/* Check for loopback when the port lid is not set */
if (wc.slid == 0 && sqp->ibqp.qp_type == IB_QPT_GSI)
wc.slid = be16_to_cpu(IB_LID_PERMISSIVE);
wc.sl = rdma_ah_get_sl(ah_attr);
wc.dlid_path_bits = rdma_ah_get_dlid(ah_attr) & ((1 << ppd->lmc) - 1);
wc.port_num = qp->port_num;
/* Signal completion event if the solicited bit is set. */
rvt_recv_cq(qp, &wc, swqe->wr.send_flags & IB_SEND_SOLICITED);
ibp->rvp.n_loop_pkts++;
bail_unlock:
spin_unlock_irqrestore(&qp->r_lock, flags);
drop:
rcu_read_unlock();
}
static void hfi1_make_bth_deth(struct rvt_qp *qp, struct rvt_swqe *wqe,
struct ib_other_headers *ohdr,
u16 *pkey, u32 extra_bytes, bool bypass)
{
u32 bth0;
struct hfi1_ibport *ibp;
ibp = to_iport(qp->ibqp.device, qp->port_num);
if (wqe->wr.opcode == IB_WR_SEND_WITH_IMM) {
ohdr->u.ud.imm_data = wqe->wr.ex.imm_data;
bth0 = IB_OPCODE_UD_SEND_ONLY_WITH_IMMEDIATE << 24;
} else {
bth0 = IB_OPCODE_UD_SEND_ONLY << 24;
}
if (wqe->wr.send_flags & IB_SEND_SOLICITED)
bth0 |= IB_BTH_SOLICITED;
bth0 |= extra_bytes << 20;
if (qp->ibqp.qp_type == IB_QPT_GSI || qp->ibqp.qp_type == IB_QPT_SMI)
*pkey = hfi1_get_pkey(ibp, rvt_get_swqe_pkey_index(wqe));
else
*pkey = hfi1_get_pkey(ibp, qp->s_pkey_index);
if (!bypass)
bth0 |= *pkey;
ohdr->bth[0] = cpu_to_be32(bth0);
ohdr->bth[1] = cpu_to_be32(rvt_get_swqe_remote_qpn(wqe));
ohdr->bth[2] = cpu_to_be32(mask_psn(wqe->psn));
/*
* Qkeys with the high order bit set mean use the
* qkey from the QP context instead of the WR (see 10.2.5).
*/
ohdr->u.ud.deth[0] =
cpu_to_be32((int)rvt_get_swqe_remote_qkey(wqe) < 0 ? qp->qkey :
rvt_get_swqe_remote_qkey(wqe));
ohdr->u.ud.deth[1] = cpu_to_be32(qp->ibqp.qp_num);
}
void hfi1_make_ud_req_9B(struct rvt_qp *qp, struct hfi1_pkt_state *ps,
struct rvt_swqe *wqe)
{
u32 nwords, extra_bytes;
u16 len, slid, dlid, pkey;
u16 lrh0 = 0;
u8 sc5;
struct hfi1_qp_priv *priv = qp->priv;
struct ib_other_headers *ohdr;
struct rdma_ah_attr *ah_attr;
struct hfi1_pportdata *ppd;
struct hfi1_ibport *ibp;
struct ib_grh *grh;
ibp = to_iport(qp->ibqp.device, qp->port_num);
ppd = ppd_from_ibp(ibp);
ah_attr = rvt_get_swqe_ah_attr(wqe);
extra_bytes = -wqe->length & 3;
nwords = ((wqe->length + extra_bytes) >> 2) + SIZE_OF_CRC;
/* header size in dwords LRH+BTH+DETH = (8+12+8)/4. */
ps->s_txreq->hdr_dwords = 7;
if (wqe->wr.opcode == IB_WR_SEND_WITH_IMM)
ps->s_txreq->hdr_dwords++;
if (rdma_ah_get_ah_flags(ah_attr) & IB_AH_GRH) {
grh = &ps->s_txreq->phdr.hdr.ibh.u.l.grh;
ps->s_txreq->hdr_dwords +=
hfi1_make_grh(ibp, grh, rdma_ah_read_grh(ah_attr),
ps->s_txreq->hdr_dwords - LRH_9B_DWORDS,
nwords);
lrh0 = HFI1_LRH_GRH;
ohdr = &ps->s_txreq->phdr.hdr.ibh.u.l.oth;
} else {
lrh0 = HFI1_LRH_BTH;
ohdr = &ps->s_txreq->phdr.hdr.ibh.u.oth;
}
sc5 = ibp->sl_to_sc[rdma_ah_get_sl(ah_attr)];
lrh0 |= (rdma_ah_get_sl(ah_attr) & 0xf) << 4;
if (qp->ibqp.qp_type == IB_QPT_SMI) {
lrh0 |= 0xF000; /* Set VL (see ch. 13.5.3.1) */
priv->s_sc = 0xf;
} else {
lrh0 |= (sc5 & 0xf) << 12;
priv->s_sc = sc5;
}
dlid = opa_get_lid(rdma_ah_get_dlid(ah_attr), 9B);
if (dlid == be16_to_cpu(IB_LID_PERMISSIVE)) {
slid = be16_to_cpu(IB_LID_PERMISSIVE);
} else {
u16 lid = (u16)ppd->lid;
if (lid) {
lid |= rdma_ah_get_path_bits(ah_attr) &
((1 << ppd->lmc) - 1);
slid = lid;
} else {
slid = be16_to_cpu(IB_LID_PERMISSIVE);
}
}
hfi1_make_bth_deth(qp, wqe, ohdr, &pkey, extra_bytes, false);
len = ps->s_txreq->hdr_dwords + nwords;
/* Setup the packet */
ps->s_txreq->phdr.hdr.hdr_type = HFI1_PKT_TYPE_9B;
hfi1_make_ib_hdr(&ps->s_txreq->phdr.hdr.ibh,
lrh0, len, dlid, slid);
}
void hfi1_make_ud_req_16B(struct rvt_qp *qp, struct hfi1_pkt_state *ps,
struct rvt_swqe *wqe)
{
struct hfi1_qp_priv *priv = qp->priv;
struct ib_other_headers *ohdr;
struct rdma_ah_attr *ah_attr;
struct hfi1_pportdata *ppd;
struct hfi1_ibport *ibp;
u32 dlid, slid, nwords, extra_bytes;
u32 dest_qp = rvt_get_swqe_remote_qpn(wqe);
u32 src_qp = qp->ibqp.qp_num;
u16 len, pkey;
u8 l4, sc5;
bool is_mgmt = false;
ibp = to_iport(qp->ibqp.device, qp->port_num);
ppd = ppd_from_ibp(ibp);
ah_attr = rvt_get_swqe_ah_attr(wqe);
/*
* Build 16B Management Packet if either the destination
* or source queue pair number is 0 or 1.
*/
if (dest_qp == 0 || src_qp == 0 || dest_qp == 1 || src_qp == 1) {
/* header size in dwords 16B LRH+L4_FM = (16+8)/4. */
ps->s_txreq->hdr_dwords = 6;
is_mgmt = true;
} else {
/* header size in dwords 16B LRH+BTH+DETH = (16+12+8)/4. */
ps->s_txreq->hdr_dwords = 9;
if (wqe->wr.opcode == IB_WR_SEND_WITH_IMM)
ps->s_txreq->hdr_dwords++;
}
/* SW provides space for CRC and LT for bypass packets. */
extra_bytes = hfi1_get_16b_padding((ps->s_txreq->hdr_dwords << 2),
wqe->length);
nwords = ((wqe->length + extra_bytes + SIZE_OF_LT) >> 2) + SIZE_OF_CRC;
if ((rdma_ah_get_ah_flags(ah_attr) & IB_AH_GRH) &&
hfi1_check_mcast(rdma_ah_get_dlid(ah_attr))) {
struct ib_grh *grh;
struct ib_global_route *grd = rdma_ah_retrieve_grh(ah_attr);
/*
* Ensure OPA GIDs are transformed to IB gids
* before creating the GRH.
*/
if (grd->sgid_index == OPA_GID_INDEX) {
dd_dev_warn(ppd->dd, "Bad sgid_index. sgid_index: %d\n",
grd->sgid_index);
grd->sgid_index = 0;
}
grh = &ps->s_txreq->phdr.hdr.opah.u.l.grh;
ps->s_txreq->hdr_dwords += hfi1_make_grh(
ibp, grh, grd,
ps->s_txreq->hdr_dwords - LRH_16B_DWORDS,
nwords);
ohdr = &ps->s_txreq->phdr.hdr.opah.u.l.oth;
l4 = OPA_16B_L4_IB_GLOBAL;
} else {
ohdr = &ps->s_txreq->phdr.hdr.opah.u.oth;
l4 = OPA_16B_L4_IB_LOCAL;
}
sc5 = ibp->sl_to_sc[rdma_ah_get_sl(ah_attr)];
if (qp->ibqp.qp_type == IB_QPT_SMI)
priv->s_sc = 0xf;
else
priv->s_sc = sc5;
dlid = opa_get_lid(rdma_ah_get_dlid(ah_attr), 16B);
if (!ppd->lid)
slid = be32_to_cpu(OPA_LID_PERMISSIVE);
else
slid = ppd->lid | (rdma_ah_get_path_bits(ah_attr) &
((1 << ppd->lmc) - 1));
if (is_mgmt) {
l4 = OPA_16B_L4_FM;
pkey = hfi1_get_pkey(ibp, rvt_get_swqe_pkey_index(wqe));
hfi1_16B_set_qpn(&ps->s_txreq->phdr.hdr.opah.u.mgmt,
dest_qp, src_qp);
} else {
hfi1_make_bth_deth(qp, wqe, ohdr, &pkey, extra_bytes, true);
}
/* Convert dwords to flits */
len = (ps->s_txreq->hdr_dwords + nwords) >> 1;
/* Setup the packet */
ps->s_txreq->phdr.hdr.hdr_type = HFI1_PKT_TYPE_16B;
hfi1_make_16b_hdr(&ps->s_txreq->phdr.hdr.opah,
slid, dlid, len, pkey, 0, 0, l4, priv->s_sc);
}
/**
* hfi1_make_ud_req - construct a UD request packet
* @qp: the QP
* @ps: the current packet state
*
* Assume s_lock is held.
*
* Return 1 if constructed; otherwise, return 0.
*/
int hfi1_make_ud_req(struct rvt_qp *qp, struct hfi1_pkt_state *ps)
{
struct hfi1_qp_priv *priv = qp->priv;
struct rdma_ah_attr *ah_attr;
struct hfi1_pportdata *ppd;
struct hfi1_ibport *ibp;
struct rvt_swqe *wqe;
int next_cur;
u32 lid;
ps->s_txreq = get_txreq(ps->dev, qp);
if (!ps->s_txreq)
goto bail_no_tx;
if (!(ib_rvt_state_ops[qp->state] & RVT_PROCESS_NEXT_SEND_OK)) {
if (!(ib_rvt_state_ops[qp->state] & RVT_FLUSH_SEND))
goto bail;
/* We are in the error state, flush the work request. */
if (qp->s_last == READ_ONCE(qp->s_head))
goto bail;
/* If DMAs are in progress, we can't flush immediately. */
if (iowait_sdma_pending(&priv->s_iowait)) {
qp->s_flags |= RVT_S_WAIT_DMA;
goto bail;
}
wqe = rvt_get_swqe_ptr(qp, qp->s_last);
rvt_send_complete(qp, wqe, IB_WC_WR_FLUSH_ERR);
goto done_free_tx;
}
/* see post_one_send() */
if (qp->s_cur == READ_ONCE(qp->s_head))
goto bail;
wqe = rvt_get_swqe_ptr(qp, qp->s_cur);
next_cur = qp->s_cur + 1;
if (next_cur >= qp->s_size)
next_cur = 0;
/* Construct the header. */
ibp = to_iport(qp->ibqp.device, qp->port_num);
ppd = ppd_from_ibp(ibp);
ah_attr = rvt_get_swqe_ah_attr(wqe);
priv->hdr_type = hfi1_get_hdr_type(ppd->lid, ah_attr);
if ((!hfi1_check_mcast(rdma_ah_get_dlid(ah_attr))) ||
(rdma_ah_get_dlid(ah_attr) == be32_to_cpu(OPA_LID_PERMISSIVE))) {
lid = rdma_ah_get_dlid(ah_attr) & ~((1 << ppd->lmc) - 1);
if (unlikely(!loopback &&
((lid == ppd->lid) ||
((lid == be32_to_cpu(OPA_LID_PERMISSIVE)) &&
(qp->ibqp.qp_type == IB_QPT_GSI))))) {
unsigned long tflags = ps->flags;
/*
* If DMAs are in progress, we can't generate
* a completion for the loopback packet since
* it would be out of order.
* Instead of waiting, we could queue a
* zero length descriptor so we get a callback.
*/
if (iowait_sdma_pending(&priv->s_iowait)) {
qp->s_flags |= RVT_S_WAIT_DMA;
goto bail;
}
qp->s_cur = next_cur;
spin_unlock_irqrestore(&qp->s_lock, tflags);
ud_loopback(qp, wqe);
spin_lock_irqsave(&qp->s_lock, tflags);
ps->flags = tflags;
rvt_send_complete(qp, wqe, IB_WC_SUCCESS);
goto done_free_tx;
}
}
qp->s_cur = next_cur;
ps->s_txreq->s_cur_size = wqe->length;
ps->s_txreq->ss = &qp->s_sge;
qp->s_srate = rdma_ah_get_static_rate(ah_attr);
qp->srate_mbps = ib_rate_to_mbps(qp->s_srate);
qp->s_wqe = wqe;
qp->s_sge.sge = wqe->sg_list[0];
qp->s_sge.sg_list = wqe->sg_list + 1;
qp->s_sge.num_sge = wqe->wr.num_sge;
qp->s_sge.total_len = wqe->length;
/* Make the appropriate header */
hfi1_make_ud_req_tbl[priv->hdr_type](qp, ps, qp->s_wqe);
priv->s_sde = qp_to_sdma_engine(qp, priv->s_sc);
ps->s_txreq->sde = priv->s_sde;
priv->s_sendcontext = qp_to_send_context(qp, priv->s_sc);
ps->s_txreq->psc = priv->s_sendcontext;
/* disarm any ahg */
priv->s_ahg->ahgcount = 0;
priv->s_ahg->ahgidx = 0;
priv->s_ahg->tx_flags = 0;
return 1;
done_free_tx:
hfi1_put_txreq(ps->s_txreq);
ps->s_txreq = NULL;
return 1;
bail:
hfi1_put_txreq(ps->s_txreq);
bail_no_tx:
ps->s_txreq = NULL;
qp->s_flags &= ~RVT_S_BUSY;
return 0;
}
/*
* Hardware can't check this so we do it here.
*
* This is a slightly different algorithm than the standard pkey check. It
* special cases the management keys and allows for 0x7fff and 0xffff to be in
* the table at the same time.
*
* @returns the index found or -1 if not found
*/
int hfi1_lookup_pkey_idx(struct hfi1_ibport *ibp, u16 pkey)
{
struct hfi1_pportdata *ppd = ppd_from_ibp(ibp);
unsigned i;
if (pkey == FULL_MGMT_P_KEY || pkey == LIM_MGMT_P_KEY) {
unsigned lim_idx = -1;
for (i = 0; i < ARRAY_SIZE(ppd->pkeys); ++i) {
/* here we look for an exact match */
if (ppd->pkeys[i] == pkey)
return i;
if (ppd->pkeys[i] == LIM_MGMT_P_KEY)
lim_idx = i;
}
/* did not find 0xffff return 0x7fff idx if found */
if (pkey == FULL_MGMT_P_KEY)
return lim_idx;
/* no match... */
return -1;
}
pkey &= 0x7fff; /* remove limited/full membership bit */
for (i = 0; i < ARRAY_SIZE(ppd->pkeys); ++i)
if ((ppd->pkeys[i] & 0x7fff) == pkey)
return i;
/*
* Should not get here, this means hardware failed to validate pkeys.
*/
return -1;
}
void return_cnp_16B(struct hfi1_ibport *ibp, struct rvt_qp *qp,
u32 remote_qpn, u16 pkey, u32 slid, u32 dlid,
u8 sc5, const struct ib_grh *old_grh)
{
u64 pbc, pbc_flags = 0;
u32 bth0, plen, vl, hwords = 7;
u16 len;
u8 l4;
struct hfi1_opa_header hdr;
struct ib_other_headers *ohdr;
struct pio_buf *pbuf;
struct send_context *ctxt = qp_to_send_context(qp, sc5);
struct hfi1_pportdata *ppd = ppd_from_ibp(ibp);
u32 nwords;
hdr.hdr_type = HFI1_PKT_TYPE_16B;
/* Populate length */
nwords = ((hfi1_get_16b_padding(hwords << 2, 0) +
SIZE_OF_LT) >> 2) + SIZE_OF_CRC;
if (old_grh) {
struct ib_grh *grh = &hdr.opah.u.l.grh;
grh->version_tclass_flow = old_grh->version_tclass_flow;
grh->paylen = cpu_to_be16(
(hwords - LRH_16B_DWORDS + nwords) << 2);
grh->hop_limit = 0xff;
grh->sgid = old_grh->dgid;
grh->dgid = old_grh->sgid;
ohdr = &hdr.opah.u.l.oth;
l4 = OPA_16B_L4_IB_GLOBAL;
hwords += sizeof(struct ib_grh) / sizeof(u32);
} else {
ohdr = &hdr.opah.u.oth;
l4 = OPA_16B_L4_IB_LOCAL;
}
/* BIT 16 to 19 is TVER. Bit 20 to 22 is pad cnt */
bth0 = (IB_OPCODE_CNP << 24) | (1 << 16) |
(hfi1_get_16b_padding(hwords << 2, 0) << 20);
ohdr->bth[0] = cpu_to_be32(bth0);
ohdr->bth[1] = cpu_to_be32(remote_qpn);
ohdr->bth[2] = 0; /* PSN 0 */
/* Convert dwords to flits */
len = (hwords + nwords) >> 1;
hfi1_make_16b_hdr(&hdr.opah, slid, dlid, len, pkey, 1, 0, l4, sc5);
plen = 2 /* PBC */ + hwords + nwords;
pbc_flags |= PBC_PACKET_BYPASS | PBC_INSERT_BYPASS_ICRC;
vl = sc_to_vlt(ppd->dd, sc5);
pbc = create_pbc(ppd, pbc_flags, qp->srate_mbps, vl, plen);
if (ctxt) {
pbuf = sc_buffer_alloc(ctxt, plen, NULL, NULL);
if (!IS_ERR_OR_NULL(pbuf)) {
trace_pio_output_ibhdr(ppd->dd, &hdr, sc5);
ppd->dd->pio_inline_send(ppd->dd, pbuf, pbc,
&hdr, hwords);
}
}
}
void return_cnp(struct hfi1_ibport *ibp, struct rvt_qp *qp, u32 remote_qpn,
u16 pkey, u32 slid, u32 dlid, u8 sc5,
const struct ib_grh *old_grh)
{
u64 pbc, pbc_flags = 0;
u32 bth0, plen, vl, hwords = 5;
u16 lrh0;
u8 sl = ibp->sc_to_sl[sc5];
struct hfi1_opa_header hdr;
struct ib_other_headers *ohdr;
struct pio_buf *pbuf;
struct send_context *ctxt = qp_to_send_context(qp, sc5);
struct hfi1_pportdata *ppd = ppd_from_ibp(ibp);
hdr.hdr_type = HFI1_PKT_TYPE_9B;
if (old_grh) {
struct ib_grh *grh = &hdr.ibh.u.l.grh;
grh->version_tclass_flow = old_grh->version_tclass_flow;
grh->paylen = cpu_to_be16(
(hwords - LRH_9B_DWORDS + SIZE_OF_CRC) << 2);
grh->hop_limit = 0xff;
grh->sgid = old_grh->dgid;
grh->dgid = old_grh->sgid;
ohdr = &hdr.ibh.u.l.oth;
lrh0 = HFI1_LRH_GRH;
hwords += sizeof(struct ib_grh) / sizeof(u32);
} else {
ohdr = &hdr.ibh.u.oth;
lrh0 = HFI1_LRH_BTH;
}
lrh0 |= (sc5 & 0xf) << 12 | sl << 4;
bth0 = pkey | (IB_OPCODE_CNP << 24);
ohdr->bth[0] = cpu_to_be32(bth0);
ohdr->bth[1] = cpu_to_be32(remote_qpn | (1 << IB_BECN_SHIFT));
ohdr->bth[2] = 0; /* PSN 0 */
hfi1_make_ib_hdr(&hdr.ibh, lrh0, hwords + SIZE_OF_CRC, dlid, slid);
plen = 2 /* PBC */ + hwords;
pbc_flags |= (ib_is_sc5(sc5) << PBC_DC_INFO_SHIFT);
vl = sc_to_vlt(ppd->dd, sc5);
pbc = create_pbc(ppd, pbc_flags, qp->srate_mbps, vl, plen);
if (ctxt) {
pbuf = sc_buffer_alloc(ctxt, plen, NULL, NULL);
if (!IS_ERR_OR_NULL(pbuf)) {
trace_pio_output_ibhdr(ppd->dd, &hdr, sc5);
ppd->dd->pio_inline_send(ppd->dd, pbuf, pbc,
&hdr, hwords);
}
}
}
/*
* opa_smp_check() - Do the regular pkey checking, and the additional
* checks for SMPs specified in OPAv1 rev 1.0, 9/19/2016 update, section
* 9.10.25 ("SMA Packet Checks").
*
* Note that:
* - Checks are done using the pkey directly from the packet's BTH,
* and specifically _not_ the pkey that we attach to the completion,
* which may be different.
* - These checks are specifically for "non-local" SMPs (i.e., SMPs
* which originated on another node). SMPs which are sent from, and
* destined to this node are checked in opa_local_smp_check().
*
* At the point where opa_smp_check() is called, we know:
* - destination QP is QP0
*
* opa_smp_check() returns 0 if all checks succeed, 1 otherwise.
*/
static int opa_smp_check(struct hfi1_ibport *ibp, u16 pkey, u8 sc5,
struct rvt_qp *qp, u16 slid, struct opa_smp *smp)
{
struct hfi1_pportdata *ppd = ppd_from_ibp(ibp);
/*
* I don't think it's possible for us to get here with sc != 0xf,
* but check it to be certain.
*/
if (sc5 != 0xf)
return 1;
if (rcv_pkey_check(ppd, pkey, sc5, slid))
return 1;
/*
* At this point we know (and so don't need to check again) that
* the pkey is either LIM_MGMT_P_KEY, or FULL_MGMT_P_KEY
* (see ingress_pkey_check).
*/
if (smp->mgmt_class != IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE &&
smp->mgmt_class != IB_MGMT_CLASS_SUBN_LID_ROUTED) {
ingress_pkey_table_fail(ppd, pkey, slid);
return 1;
}
/*
* SMPs fall into one of four (disjoint) categories:
* SMA request, SMA response, SMA trap, or SMA trap repress.
* Our response depends, in part, on which type of SMP we're
* processing.
*
* If this is an SMA response, skip the check here.
*
* If this is an SMA request or SMA trap repress:
* - pkey != FULL_MGMT_P_KEY =>
* increment port recv constraint errors, drop MAD
*
* Otherwise:
* - accept if the port is running an SM
* - drop MAD if it's an SMA trap
* - pkey == FULL_MGMT_P_KEY =>
* reply with unsupported method
* - pkey != FULL_MGMT_P_KEY =>
* increment port recv constraint errors, drop MAD
*/
switch (smp->method) {
case IB_MGMT_METHOD_GET_RESP:
case IB_MGMT_METHOD_REPORT_RESP:
break;
case IB_MGMT_METHOD_GET:
case IB_MGMT_METHOD_SET:
case IB_MGMT_METHOD_REPORT:
case IB_MGMT_METHOD_TRAP_REPRESS:
if (pkey != FULL_MGMT_P_KEY) {
ingress_pkey_table_fail(ppd, pkey, slid);
return 1;
}
break;
default:
if (ibp->rvp.port_cap_flags & IB_PORT_SM)
return 0;
if (smp->method == IB_MGMT_METHOD_TRAP)
return 1;
if (pkey == FULL_MGMT_P_KEY) {
smp->status |= IB_SMP_UNSUP_METHOD;
return 0;
}
ingress_pkey_table_fail(ppd, pkey, slid);
return 1;
}
return 0;
}
/**
* hfi1_ud_rcv - receive an incoming UD packet
* @packet: the packet structure
*
* This is called from qp_rcv() to process an incoming UD packet
* for the given QP.
* Called at interrupt level.
*/
void hfi1_ud_rcv(struct hfi1_packet *packet)
{
u32 hdrsize = packet->hlen;
struct ib_wc wc;
u32 src_qp;
u16 pkey;
int mgmt_pkey_idx = -1;
struct hfi1_ibport *ibp = rcd_to_iport(packet->rcd);
struct hfi1_pportdata *ppd = ppd_from_ibp(ibp);
void *data = packet->payload;
u32 tlen = packet->tlen;
struct rvt_qp *qp = packet->qp;
u8 sc5 = packet->sc;
u8 sl_from_sc;
u8 opcode = packet->opcode;
u8 sl = packet->sl;
u32 dlid = packet->dlid;
u32 slid = packet->slid;
u8 extra_bytes;
u8 l4 = 0;
bool dlid_is_permissive;
bool slid_is_permissive;
bool solicited = false;
extra_bytes = packet->pad + packet->extra_byte + (SIZE_OF_CRC << 2);
if (packet->etype == RHF_RCV_TYPE_BYPASS) {
u32 permissive_lid =
opa_get_lid(be32_to_cpu(OPA_LID_PERMISSIVE), 16B);
l4 = hfi1_16B_get_l4(packet->hdr);
pkey = hfi1_16B_get_pkey(packet->hdr);
dlid_is_permissive = (dlid == permissive_lid);
slid_is_permissive = (slid == permissive_lid);
} else {
pkey = ib_bth_get_pkey(packet->ohdr);
dlid_is_permissive = (dlid == be16_to_cpu(IB_LID_PERMISSIVE));
slid_is_permissive = (slid == be16_to_cpu(IB_LID_PERMISSIVE));
}
sl_from_sc = ibp->sc_to_sl[sc5];
if (likely(l4 != OPA_16B_L4_FM)) {
src_qp = ib_get_sqpn(packet->ohdr);
solicited = ib_bth_is_solicited(packet->ohdr);
} else {
src_qp = hfi1_16B_get_src_qpn(packet->mgmt);
}
process_ecn(qp, packet);
/*
* Get the number of bytes the message was padded by
* and drop incomplete packets.
*/
if (unlikely(tlen < (hdrsize + extra_bytes)))
goto drop;
tlen -= hdrsize + extra_bytes;
/*
* Check that the permissive LID is only used on QP0
* and the QKEY matches (see 9.6.1.4.1 and 9.6.1.5.1).
*/
if (qp->ibqp.qp_num) {
if (unlikely(dlid_is_permissive || slid_is_permissive))
goto drop;
if (qp->ibqp.qp_num > 1) {
if (unlikely(rcv_pkey_check(ppd, pkey, sc5, slid))) {
/*
* Traps will not be sent for packets dropped
* by the HW. This is fine, as sending trap
* for invalid pkeys is optional according to
* IB spec (release 1.3, section 10.9.4)
*/
hfi1_bad_pkey(ibp,
pkey, sl,
src_qp, qp->ibqp.qp_num,
slid, dlid);
return;
}
} else {
/* GSI packet */
mgmt_pkey_idx = hfi1_lookup_pkey_idx(ibp, pkey);
if (mgmt_pkey_idx < 0)
goto drop;
}
if (unlikely(l4 != OPA_16B_L4_FM &&
ib_get_qkey(packet->ohdr) != qp->qkey))
return; /* Silent drop */
/* Drop invalid MAD packets (see 13.5.3.1). */
if (unlikely(qp->ibqp.qp_num == 1 &&
(tlen > 2048 || (sc5 == 0xF))))
goto drop;
} else {
/* Received on QP0, and so by definition, this is an SMP */
struct opa_smp *smp = (struct opa_smp *)data;
if (opa_smp_check(ibp, pkey, sc5, qp, slid, smp))
goto drop;
if (tlen > 2048)
goto drop;
if ((dlid_is_permissive || slid_is_permissive) &&
smp->mgmt_class != IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)
goto drop;
/* look up SMI pkey */
mgmt_pkey_idx = hfi1_lookup_pkey_idx(ibp, pkey);
if (mgmt_pkey_idx < 0)
goto drop;
}
if (qp->ibqp.qp_num > 1 &&
opcode == IB_OPCODE_UD_SEND_ONLY_WITH_IMMEDIATE) {
wc.ex.imm_data = packet->ohdr->u.ud.imm_data;
wc.wc_flags = IB_WC_WITH_IMM;
} else if (opcode == IB_OPCODE_UD_SEND_ONLY) {
wc.ex.imm_data = 0;
wc.wc_flags = 0;
} else {
goto drop;
}
/*
* A GRH is expected to precede the data even if not
* present on the wire.
*/
wc.byte_len = tlen + sizeof(struct ib_grh);
/*
* Get the next work request entry to find where to put the data.
*/
if (qp->r_flags & RVT_R_REUSE_SGE) {
qp->r_flags &= ~RVT_R_REUSE_SGE;
} else {
int ret;
ret = rvt_get_rwqe(qp, false);
if (ret < 0) {
rvt_rc_error(qp, IB_WC_LOC_QP_OP_ERR);
return;
}
if (!ret) {
if (qp->ibqp.qp_num == 0)
ibp->rvp.n_vl15_dropped++;
return;
}
}
/* Silently drop packets which are too big. */
if (unlikely(wc.byte_len > qp->r_len)) {
qp->r_flags |= RVT_R_REUSE_SGE;
goto drop;
}
if (packet->grh) {
rvt_copy_sge(qp, &qp->r_sge, packet->grh,
sizeof(struct ib_grh), true, false);
wc.wc_flags |= IB_WC_GRH;
} else if (packet->etype == RHF_RCV_TYPE_BYPASS) {
struct ib_grh grh;
/*
* Assuming we only created 16B on the send side
* if we want to use large LIDs, since GRH was stripped
* out when creating 16B, add back the GRH here.
*/
hfi1_make_ext_grh(packet, &grh, slid, dlid);
rvt_copy_sge(qp, &qp->r_sge, &grh,
sizeof(struct ib_grh), true, false);
wc.wc_flags |= IB_WC_GRH;
} else {
rvt_skip_sge(&qp->r_sge, sizeof(struct ib_grh), true);
}
rvt_copy_sge(qp, &qp->r_sge, data, wc.byte_len - sizeof(struct ib_grh),
true, false);
rvt_put_ss(&qp->r_sge);
if (!test_and_clear_bit(RVT_R_WRID_VALID, &qp->r_aflags))
return;
wc.wr_id = qp->r_wr_id;
wc.status = IB_WC_SUCCESS;
wc.opcode = IB_WC_RECV;
wc.vendor_err = 0;
wc.qp = &qp->ibqp;
wc.src_qp = src_qp;
if (qp->ibqp.qp_type == IB_QPT_GSI ||
qp->ibqp.qp_type == IB_QPT_SMI) {
if (mgmt_pkey_idx < 0) {
if (net_ratelimit()) {
struct hfi1_devdata *dd = ppd->dd;
dd_dev_err(dd, "QP type %d mgmt_pkey_idx < 0 and packet not dropped???\n",
qp->ibqp.qp_type);
mgmt_pkey_idx = 0;
}
}
wc.pkey_index = (unsigned)mgmt_pkey_idx;
} else {
wc.pkey_index = 0;
}
if (slid_is_permissive)
slid = be32_to_cpu(OPA_LID_PERMISSIVE);
wc.slid = slid & U16_MAX;
wc.sl = sl_from_sc;
/*
* Save the LMC lower bits if the destination LID is a unicast LID.
*/
wc.dlid_path_bits = hfi1_check_mcast(dlid) ? 0 :
dlid & ((1 << ppd_from_ibp(ibp)->lmc) - 1);
wc.port_num = qp->port_num;
/* Signal completion event if the solicited bit is set. */
rvt_recv_cq(qp, &wc, solicited);
return;
drop:
ibp->rvp.n_pkt_drops++;
}
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