linux/drivers/infiniband/hw/hfi1/ud.c

// 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] = …;

/**
 * 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)
{ … }

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)
{ … }

void hfi1_make_ud_req_9B(struct rvt_qp *qp, struct hfi1_pkt_state *ps,
			 struct rvt_swqe *wqe)
{ … }

void hfi1_make_ud_req_16B(struct rvt_qp *qp, struct hfi1_pkt_state *ps,
			  struct rvt_swqe *wqe)
{ … }

/**
 * 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)
{ … }

/*
 * 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)
{ … }

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)
{ … }

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)
{ … }

/*
 * 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)
{ … }

/**
 * 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)
{ … }