Orange Pi5 kernel

// SPDX-License-Identifier: GPL-2.0 or BSD-3-Clause
 
/* Authors: Bernard Metzler <bmt@zurich.ibm.com> */
/* Copyright (c) 2008-2019, IBM Corporation */
 
#include <linux/errno.h>
#include <linux/types.h>
#include <linux/net.h>
#include <linux/scatterlist.h>
#include <linux/llist.h>
#include <asm/barrier.h>
#include <net/tcp.h>
 
#include "siw.h"
#include "siw_verbs.h"
#include "siw_mem.h"
 
static char siw_qp_state_to_string[SIW_QP_STATE_COUNT][sizeof "TERMINATE"] = {
<------>[SIW_QP_STATE_IDLE] = "IDLE",
<------>[SIW_QP_STATE_RTR] = "RTR",
<------>[SIW_QP_STATE_RTS] = "RTS",
<------>[SIW_QP_STATE_CLOSING] = "CLOSING",
<------>[SIW_QP_STATE_TERMINATE] = "TERMINATE",
<------>[SIW_QP_STATE_ERROR] = "ERROR"
};
 
/*
 * iWARP (RDMAP, DDP and MPA) parameters as well as Softiwarp settings on a
 * per-RDMAP message basis. Please keep order of initializer. All MPA len
 * is initialized to minimum packet size.
 */
struct iwarp_msg_info iwarp_pktinfo[RDMAP_TERMINATE + 1] = {
<------>{ /* RDMAP_RDMA_WRITE */
<------>  .hdr_len = sizeof(struct iwarp_rdma_write),
<------>  .ctrl.mpa_len = htons(sizeof(struct iwarp_rdma_write) - 2),
<------>  .ctrl.ddp_rdmap_ctrl = DDP_FLAG_TAGGED | DDP_FLAG_LAST |
<------><------><------><------> cpu_to_be16(DDP_VERSION << 8) |
<------><------><------><------> cpu_to_be16(RDMAP_VERSION << 6) |
<------><------><------><------> cpu_to_be16(RDMAP_RDMA_WRITE),
<------>  .rx_data = siw_proc_write },
<------>{ /* RDMAP_RDMA_READ_REQ */
<------>  .hdr_len = sizeof(struct iwarp_rdma_rreq),
<------>  .ctrl.mpa_len = htons(sizeof(struct iwarp_rdma_rreq) - 2),
<------>  .ctrl.ddp_rdmap_ctrl = DDP_FLAG_LAST | cpu_to_be16(DDP_VERSION << 8) |
<------><------><------><------> cpu_to_be16(RDMAP_VERSION << 6) |
<------><------><------><------> cpu_to_be16(RDMAP_RDMA_READ_REQ),
<------>  .rx_data = siw_proc_rreq },
<------>{ /* RDMAP_RDMA_READ_RESP */
<------>  .hdr_len = sizeof(struct iwarp_rdma_rresp),
<------>  .ctrl.mpa_len = htons(sizeof(struct iwarp_rdma_rresp) - 2),
<------>  .ctrl.ddp_rdmap_ctrl = DDP_FLAG_TAGGED | DDP_FLAG_LAST |
<------><------><------><------> cpu_to_be16(DDP_VERSION << 8) |
<------><------><------><------> cpu_to_be16(RDMAP_VERSION << 6) |
<------><------><------><------> cpu_to_be16(RDMAP_RDMA_READ_RESP),
<------>  .rx_data = siw_proc_rresp },
<------>{ /* RDMAP_SEND */
<------>  .hdr_len = sizeof(struct iwarp_send),
<------>  .ctrl.mpa_len = htons(sizeof(struct iwarp_send) - 2),
<------>  .ctrl.ddp_rdmap_ctrl = DDP_FLAG_LAST | cpu_to_be16(DDP_VERSION << 8) |
<------><------><------><------> cpu_to_be16(RDMAP_VERSION << 6) |
<------><------><------><------> cpu_to_be16(RDMAP_SEND),
<------>  .rx_data = siw_proc_send },
<------>{ /* RDMAP_SEND_INVAL */
<------>  .hdr_len = sizeof(struct iwarp_send_inv),
<------>  .ctrl.mpa_len = htons(sizeof(struct iwarp_send_inv) - 2),
<------>  .ctrl.ddp_rdmap_ctrl = DDP_FLAG_LAST | cpu_to_be16(DDP_VERSION << 8) |
<------><------><------><------> cpu_to_be16(RDMAP_VERSION << 6) |
<------><------><------><------> cpu_to_be16(RDMAP_SEND_INVAL),
<------>  .rx_data = siw_proc_send },
<------>{ /* RDMAP_SEND_SE */
<------>  .hdr_len = sizeof(struct iwarp_send),
<------>  .ctrl.mpa_len = htons(sizeof(struct iwarp_send) - 2),
<------>  .ctrl.ddp_rdmap_ctrl = DDP_FLAG_LAST | cpu_to_be16(DDP_VERSION << 8) |
<------><------><------><------> cpu_to_be16(RDMAP_VERSION << 6) |
<------><------><------><------> cpu_to_be16(RDMAP_SEND_SE),
<------>  .rx_data = siw_proc_send },
<------>{ /* RDMAP_SEND_SE_INVAL */
<------>  .hdr_len = sizeof(struct iwarp_send_inv),
<------>  .ctrl.mpa_len = htons(sizeof(struct iwarp_send_inv) - 2),
<------>  .ctrl.ddp_rdmap_ctrl = DDP_FLAG_LAST | cpu_to_be16(DDP_VERSION << 8) |
<------><------><------><------> cpu_to_be16(RDMAP_VERSION << 6) |
<------><------><------><------> cpu_to_be16(RDMAP_SEND_SE_INVAL),
<------>  .rx_data = siw_proc_send },
<------>{ /* RDMAP_TERMINATE */
<------>  .hdr_len = sizeof(struct iwarp_terminate),
<------>  .ctrl.mpa_len = htons(sizeof(struct iwarp_terminate) - 2),
<------>  .ctrl.ddp_rdmap_ctrl = DDP_FLAG_LAST | cpu_to_be16(DDP_VERSION << 8) |
<------><------><------><------> cpu_to_be16(RDMAP_VERSION << 6) |
<------><------><------><------> cpu_to_be16(RDMAP_TERMINATE),
<------>  .rx_data = siw_proc_terminate }
};
 
void siw_qp_llp_data_ready(struct sock *sk)
{
<------>struct siw_qp *qp;
 
<------>read_lock(&sk->sk_callback_lock);
 
<------>if (unlikely(!sk->sk_user_data || !sk_to_qp(sk)))
<------><------>goto done;
 
<------>qp = sk_to_qp(sk);
 
<------>if (likely(!qp->rx_stream.rx_suspend &&
<------><------>   down_read_trylock(&qp->state_lock))) {
<------><------>read_descriptor_t rd_desc = { .arg.data = qp, .count = 1 };
 
<------><------>if (likely(qp->attrs.state == SIW_QP_STATE_RTS))
<------><------><------>/*
<------><------><------> * Implements data receive operation during
<------><------><------> * socket callback. TCP gracefully catches
<------><------><------> * the case where there is nothing to receive
<------><------><------> * (not calling siw_tcp_rx_data() then).
<------><------><------> */
<------><------><------>tcp_read_sock(sk, &rd_desc, siw_tcp_rx_data);
 
<------><------>up_read(&qp->state_lock);
<------>} else {
<------><------>siw_dbg_qp(qp, "unable to process RX, suspend: %d\n",
<------><------><------>   qp->rx_stream.rx_suspend);
<------>}
done:
<------>read_unlock(&sk->sk_callback_lock);
}
 
void siw_qp_llp_close(struct siw_qp *qp)
{
<------>siw_dbg_qp(qp, "enter llp close, state = %s\n",
<------><------>   siw_qp_state_to_string[qp->attrs.state]);
 
<------>down_write(&qp->state_lock);
 
<------>qp->rx_stream.rx_suspend = 1;
<------>qp->tx_ctx.tx_suspend = 1;
<------>qp->attrs.sk = NULL;
 
<------>switch (qp->attrs.state) {
<------>case SIW_QP_STATE_RTS:
<------>case SIW_QP_STATE_RTR:
<------>case SIW_QP_STATE_IDLE:
<------>case SIW_QP_STATE_TERMINATE:
<------><------>qp->attrs.state = SIW_QP_STATE_ERROR;
<------><------>break;
<------>/*
<------> * SIW_QP_STATE_CLOSING:
<------> *
<------> * This is a forced close. shall the QP be moved to
<------> * ERROR or IDLE ?
<------> */
<------>case SIW_QP_STATE_CLOSING:
<------><------>if (tx_wqe(qp)->wr_status == SIW_WR_IDLE)
<------><------><------>qp->attrs.state = SIW_QP_STATE_ERROR;
<------><------>else
<------><------><------>qp->attrs.state = SIW_QP_STATE_IDLE;
<------><------>break;
 
<------>default:
<------><------>siw_dbg_qp(qp, "llp close: no state transition needed: %s\n",
<------><------><------>   siw_qp_state_to_string[qp->attrs.state]);
<------><------>break;
<------>}
<------>siw_sq_flush(qp);
<------>siw_rq_flush(qp);
 
<------>/*
<------> * Dereference closing CEP
<------> */
<------>if (qp->cep) {
<------><------>siw_cep_put(qp->cep);
<------><------>qp->cep = NULL;
<------>}
 
<------>up_write(&qp->state_lock);
 
<------>siw_dbg_qp(qp, "llp close exit: state %s\n",
<------><------>   siw_qp_state_to_string[qp->attrs.state]);
}
 
/*
 * socket callback routine informing about newly available send space.
 * Function schedules SQ work for processing SQ items.
 */
void siw_qp_llp_write_space(struct sock *sk)
{
<------>struct siw_cep *cep;
 
<------>read_lock(&sk->sk_callback_lock);
 
<------>cep  = sk_to_cep(sk);
<------>if (cep) {
<------><------>cep->sk_write_space(sk);
 
<------><------>if (!test_bit(SOCK_NOSPACE, &sk->sk_socket->flags))
<------><------><------>(void)siw_sq_start(cep->qp);
<------>}
 
<------>read_unlock(&sk->sk_callback_lock);
}
 
static int siw_qp_readq_init(struct siw_qp *qp, int irq_size, int orq_size)
{
<------>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;
<------><------>}
<------>}
<------>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;
}
 
static int siw_qp_enable_crc(struct siw_qp *qp)
{
<------>struct siw_rx_stream *c_rx = &qp->rx_stream;
<------>struct siw_iwarp_tx *c_tx = &qp->tx_ctx;
<------>int size;
 
<------>if (siw_crypto_shash == NULL)
<------><------>return -ENOENT;
 
<------>size = crypto_shash_descsize(siw_crypto_shash) +
<------><------>sizeof(struct shash_desc);
 
<------>c_tx->mpa_crc_hd = kzalloc(size, GFP_KERNEL);
<------>c_rx->mpa_crc_hd = kzalloc(size, GFP_KERNEL);
<------>if (!c_tx->mpa_crc_hd || !c_rx->mpa_crc_hd) {
<------><------>kfree(c_tx->mpa_crc_hd);
<------><------>kfree(c_rx->mpa_crc_hd);
<------><------>c_tx->mpa_crc_hd = NULL;
<------><------>c_rx->mpa_crc_hd = NULL;
<------><------>return -ENOMEM;
<------>}
<------>c_tx->mpa_crc_hd->tfm = siw_crypto_shash;
<------>c_rx->mpa_crc_hd->tfm = siw_crypto_shash;
 
<------>return 0;
}
 
/*
 * Send a non signalled READ or WRITE to peer side as negotiated
 * with MPAv2 P2P setup protocol. The work request is only created
 * as a current active WR and does not consume Send Queue space.
 *
 * Caller must hold QP state lock.
 */
int siw_qp_mpa_rts(struct siw_qp *qp, enum mpa_v2_ctrl ctrl)
{
<------>struct siw_wqe *wqe = tx_wqe(qp);
<------>unsigned long flags;
<------>int rv = 0;
 
<------>spin_lock_irqsave(&qp->sq_lock, flags);
 
<------>if (unlikely(wqe->wr_status != SIW_WR_IDLE)) {
<------><------>spin_unlock_irqrestore(&qp->sq_lock, flags);
<------><------>return -EIO;
<------>}
<------>memset(wqe->mem, 0, sizeof(*wqe->mem) * SIW_MAX_SGE);
 
<------>wqe->wr_status = SIW_WR_QUEUED;
<------>wqe->sqe.flags = 0;
<------>wqe->sqe.num_sge = 1;
<------>wqe->sqe.sge[0].length = 0;
<------>wqe->sqe.sge[0].laddr = 0;
<------>wqe->sqe.sge[0].lkey = 0;
<------>/*
<------> * While it must not be checked for inbound zero length
<------> * READ/WRITE, some HW may treat STag 0 special.
<------> */
<------>wqe->sqe.rkey = 1;
<------>wqe->sqe.raddr = 0;
<------>wqe->processed = 0;
 
<------>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 = NULL;
 
<------><------>wqe->sqe.opcode = SIW_OP_READ;
 
<------><------>spin_lock(&qp->orq_lock);
 
<------><------>if (qp->attrs.orq_size)
<------><------><------>rreq = orq_get_free(qp);
<------><------>if (rreq) {
<------><------><------>siw_read_to_orq(rreq, &wqe->sqe);
<------><------><------>qp->orq_put++;
<------><------>} else
<------><------><------>rv = -EIO;
 
<------><------>spin_unlock(&qp->orq_lock);
<------>} else
<------><------>rv = -EINVAL;
 
<------>if (rv)
<------><------>wqe->wr_status = SIW_WR_IDLE;
 
<------>spin_unlock_irqrestore(&qp->sq_lock, flags);
 
<------>if (!rv)
<------><------>rv = siw_sq_start(qp);
 
<------>return rv;
}
 
/*
 * Map memory access error to DDP tagged error
 */
enum ddp_ecode siw_tagged_error(enum siw_access_state state)
{
<------>switch (state) {
<------>case E_STAG_INVALID:
<------><------>return DDP_ECODE_T_INVALID_STAG;
<------>case E_BASE_BOUNDS:
<------><------>return DDP_ECODE_T_BASE_BOUNDS;
<------>case E_PD_MISMATCH:
<------><------>return DDP_ECODE_T_STAG_NOT_ASSOC;
<------>case E_ACCESS_PERM:
<------><------>/*
<------><------> * RFC 5041 (DDP) lacks an ecode for insufficient access
<------><------> * permissions. 'Invalid STag' seem to be the closest
<------><------> * match though.
<------><------> */
<------><------>return DDP_ECODE_T_INVALID_STAG;
<------>default:
<------><------>WARN_ON(1);
<------><------>return DDP_ECODE_T_INVALID_STAG;
<------>}
}
 
/*
 * Map memory access error to RDMAP protection error
 */
enum rdmap_ecode siw_rdmap_error(enum siw_access_state state)
{
<------>switch (state) {
<------>case E_STAG_INVALID:
<------><------>return RDMAP_ECODE_INVALID_STAG;
<------>case E_BASE_BOUNDS:
<------><------>return RDMAP_ECODE_BASE_BOUNDS;
<------>case E_PD_MISMATCH:
<------><------>return RDMAP_ECODE_STAG_NOT_ASSOC;
<------>case E_ACCESS_PERM:
<------><------>return RDMAP_ECODE_ACCESS_RIGHTS;
<------>default:
<------><------>return RDMAP_ECODE_UNSPECIFIED;
<------>}
}
 
void siw_init_terminate(struct siw_qp *qp, enum term_elayer layer, u8 etype,
<------><------><------>u8 ecode, int in_tx)
{
<------>if (!qp->term_info.valid) {
<------><------>memset(&qp->term_info, 0, sizeof(qp->term_info));
<------><------>qp->term_info.layer = layer;
<------><------>qp->term_info.etype = etype;
<------><------>qp->term_info.ecode = ecode;
<------><------>qp->term_info.in_tx = in_tx;
<------><------>qp->term_info.valid = 1;
<------>}
<------>siw_dbg_qp(qp, "init TERM: layer %d, type %d, code %d, in tx %s\n",
<------><------>   layer, etype, ecode, in_tx ? "yes" : "no");
}
 
/*
 * Send a TERMINATE message, as defined in RFC's 5040/5041/5044/6581.
 * Sending TERMINATE messages is best effort - such messages
 * can only be send if the QP is still connected and it does
 * not have another outbound message in-progress, i.e. the
 * TERMINATE message must not interfer with an incomplete current
 * transmit operation.
 */
void siw_send_terminate(struct siw_qp *qp)
{
<------>struct kvec iov[3];
<------>struct msghdr msg = { .msg_flags = MSG_DONTWAIT | MSG_EOR };
<------>struct iwarp_terminate *term = NULL;
<------>union iwarp_hdr *err_hdr = NULL;
<------>struct socket *s = qp->attrs.sk;
<------>struct siw_rx_stream *srx = &qp->rx_stream;
<------>union iwarp_hdr *rx_hdr = &srx->hdr;
<------>u32 crc = 0;
<------>int num_frags, len_terminate, rv;
 
<------>if (!qp->term_info.valid)
<------><------>return;
 
<------>qp->term_info.valid = 0;
 
<------>if (tx_wqe(qp)->wr_status == SIW_WR_INPROGRESS) {
<------><------>siw_dbg_qp(qp, "cannot send TERMINATE: op %d in progress\n",
<------><------><------>   tx_type(tx_wqe(qp)));
<------><------>return;
<------>}
<------>if (!s && qp->cep)
<------><------>/* QP not yet in RTS. Take socket from connection end point */
<------><------>s = qp->cep->sock;
 
<------>if (!s) {
<------><------>siw_dbg_qp(qp, "cannot send TERMINATE: not connected\n");
<------><------>return;
<------>}
 
<------>term = kzalloc(sizeof(*term), GFP_KERNEL);
<------>if (!term)
<------><------>return;
 
<------>term->ddp_qn = cpu_to_be32(RDMAP_UNTAGGED_QN_TERMINATE);
<------>term->ddp_mo = 0;
<------>term->ddp_msn = cpu_to_be32(1);
 
<------>iov[0].iov_base = term;
<------>iov[0].iov_len = sizeof(*term);
 
<------>if ((qp->term_info.layer == TERM_ERROR_LAYER_DDP) ||
<------>    ((qp->term_info.layer == TERM_ERROR_LAYER_RDMAP) &&
<------>     (qp->term_info.etype != RDMAP_ETYPE_CATASTROPHIC))) {
<------><------>err_hdr = kzalloc(sizeof(*err_hdr), GFP_KERNEL);
<------><------>if (!err_hdr) {
<------><------><------>kfree(term);
<------><------><------>return;
<------><------>}
<------>}
<------>memcpy(&term->ctrl, &iwarp_pktinfo[RDMAP_TERMINATE].ctrl,
<------>       sizeof(struct iwarp_ctrl));
 
<------>__rdmap_term_set_layer(term, qp->term_info.layer);
<------>__rdmap_term_set_etype(term, qp->term_info.etype);
<------>__rdmap_term_set_ecode(term, qp->term_info.ecode);
 
<------>switch (qp->term_info.layer) {
<------>case TERM_ERROR_LAYER_RDMAP:
<------><------>if (qp->term_info.etype == RDMAP_ETYPE_CATASTROPHIC)
<------><------><------>/* No additional DDP/RDMAP header to be included */
<------><------><------>break;
 
<------><------>if (qp->term_info.etype == RDMAP_ETYPE_REMOTE_PROTECTION) {
<------><------><------>/*
<------><------><------> * Complete RDMAP frame will get attached, and
<------><------><------> * DDP segment length is valid
<------><------><------> */
<------><------><------>term->flag_m = 1;
<------><------><------>term->flag_d = 1;
<------><------><------>term->flag_r = 1;
 
<------><------><------>if (qp->term_info.in_tx) {
<------><------><------><------>struct iwarp_rdma_rreq *rreq;
<------><------><------><------>struct siw_wqe *wqe = tx_wqe(qp);
 
<------><------><------><------>/* Inbound RREQ error, detected during
<------><------><------><------> * RRESP creation. Take state from
<------><------><------><------> * current TX work queue element to
<------><------><------><------> * reconstruct peers RREQ.
<------><------><------><------> */
<------><------><------><------>rreq = (struct iwarp_rdma_rreq *)err_hdr;
 
<------><------><------><------>memcpy(&rreq->ctrl,
<------><------><------><------>       &iwarp_pktinfo[RDMAP_RDMA_READ_REQ].ctrl,
<------><------><------><------>       sizeof(struct iwarp_ctrl));
 
<------><------><------><------>rreq->rsvd = 0;
<------><------><------><------>rreq->ddp_qn =
<------><------><------><------><------>htonl(RDMAP_UNTAGGED_QN_RDMA_READ);
 
<------><------><------><------>/* Provide RREQ's MSN as kept aside */
<------><------><------><------>rreq->ddp_msn = htonl(wqe->sqe.sge[0].length);
 
<------><------><------><------>rreq->ddp_mo = htonl(wqe->processed);
<------><------><------><------>rreq->sink_stag = htonl(wqe->sqe.rkey);
<------><------><------><------>rreq->sink_to = cpu_to_be64(wqe->sqe.raddr);
<------><------><------><------>rreq->read_size = htonl(wqe->sqe.sge[0].length);
<------><------><------><------>rreq->source_stag = htonl(wqe->sqe.sge[0].lkey);
<------><------><------><------>rreq->source_to =
<------><------><------><------><------>cpu_to_be64(wqe->sqe.sge[0].laddr);
 
<------><------><------><------>iov[1].iov_base = rreq;
<------><------><------><------>iov[1].iov_len = sizeof(*rreq);
 
<------><------><------><------>rx_hdr = (union iwarp_hdr *)rreq;
<------><------><------>} else {
<------><------><------><------>/* Take RDMAP/DDP information from
<------><------><------><------> * current (failed) inbound frame.
<------><------><------><------> */
<------><------><------><------>iov[1].iov_base = rx_hdr;
 
<------><------><------><------>if (__rdmap_get_opcode(&rx_hdr->ctrl) ==
<------><------><------><------>    RDMAP_RDMA_READ_REQ)
<------><------><------><------><------>iov[1].iov_len =
<------><------><------><------><------><------>sizeof(struct iwarp_rdma_rreq);
<------><------><------><------>else /* SEND type */
<------><------><------><------><------>iov[1].iov_len =
<------><------><------><------><------><------>sizeof(struct iwarp_send);
<------><------><------>}
<------><------>} else {
<------><------><------>/* Do not report DDP hdr information if packet
<------><------><------> * layout is unknown
<------><------><------> */
<------><------><------>if ((qp->term_info.ecode == RDMAP_ECODE_VERSION) ||
<------><------><------>    (qp->term_info.ecode == RDMAP_ECODE_OPCODE))
<------><------><------><------>break;
 
<------><------><------>iov[1].iov_base = rx_hdr;
 
<------><------><------>/* Only DDP frame will get attached */
<------><------><------>if (rx_hdr->ctrl.ddp_rdmap_ctrl & DDP_FLAG_TAGGED)
<------><------><------><------>iov[1].iov_len =
<------><------><------><------><------>sizeof(struct iwarp_rdma_write);
<------><------><------>else
<------><------><------><------>iov[1].iov_len = sizeof(struct iwarp_send);
 
<------><------><------>term->flag_m = 1;
<------><------><------>term->flag_d = 1;
<------><------>}
<------><------>term->ctrl.mpa_len = cpu_to_be16(iov[1].iov_len);
<------><------>break;
 
<------>case TERM_ERROR_LAYER_DDP:
<------><------>/* Report error encountered while DDP processing.
<------><------> * This can only happen as a result of inbound
<------><------> * DDP processing
<------><------> */
 
<------><------>/* Do not report DDP hdr information if packet
<------><------> * layout is unknown
<------><------> */
<------><------>if (((qp->term_info.etype == DDP_ETYPE_TAGGED_BUF) &&
<------><------>     (qp->term_info.ecode == DDP_ECODE_T_VERSION)) ||
<------><------>    ((qp->term_info.etype == DDP_ETYPE_UNTAGGED_BUF) &&
<------><------>     (qp->term_info.ecode == DDP_ECODE_UT_VERSION)))
<------><------><------>break;
 
<------><------>iov[1].iov_base = rx_hdr;
 
<------><------>if (rx_hdr->ctrl.ddp_rdmap_ctrl & DDP_FLAG_TAGGED)
<------><------><------>iov[1].iov_len = sizeof(struct iwarp_ctrl_tagged);
<------><------>else
<------><------><------>iov[1].iov_len = sizeof(struct iwarp_ctrl_untagged);
 
<------><------>term->flag_m = 1;
<------><------>term->flag_d = 1;
<------><------>break;
 
<------>default:
<------><------>break;
<------>}
<------>if (term->flag_m || term->flag_d || term->flag_r) {
<------><------>iov[2].iov_base = &crc;
<------><------>iov[2].iov_len = sizeof(crc);
<------><------>len_terminate = sizeof(*term) + iov[1].iov_len + MPA_CRC_SIZE;
<------><------>num_frags = 3;
<------>} else {
<------><------>iov[1].iov_base = &crc;
<------><------>iov[1].iov_len = sizeof(crc);
<------><------>len_terminate = sizeof(*term) + MPA_CRC_SIZE;
<------><------>num_frags = 2;
<------>}
 
<------>/* Adjust DDP Segment Length parameter, if valid */
<------>if (term->flag_m) {
<------><------>u32 real_ddp_len = be16_to_cpu(rx_hdr->ctrl.mpa_len);
<------><------>enum rdma_opcode op = __rdmap_get_opcode(&rx_hdr->ctrl);
 
<------><------>real_ddp_len -= iwarp_pktinfo[op].hdr_len - MPA_HDR_SIZE;
<------><------>rx_hdr->ctrl.mpa_len = cpu_to_be16(real_ddp_len);
<------>}
 
<------>term->ctrl.mpa_len =
<------><------>cpu_to_be16(len_terminate - (MPA_HDR_SIZE + MPA_CRC_SIZE));
<------>if (qp->tx_ctx.mpa_crc_hd) {
<------><------>crypto_shash_init(qp->tx_ctx.mpa_crc_hd);
<------><------>if (crypto_shash_update(qp->tx_ctx.mpa_crc_hd,
<------><------><------><------><------>(u8 *)iov[0].iov_base,
<------><------><------><------><------>iov[0].iov_len))
<------><------><------>goto out;
 
<------><------>if (num_frags == 3) {
<------><------><------>if (crypto_shash_update(qp->tx_ctx.mpa_crc_hd,
<------><------><------><------><------><------>(u8 *)iov[1].iov_base,
<------><------><------><------><------><------>iov[1].iov_len))
<------><------><------><------>goto out;
<------><------>}
<------><------>crypto_shash_final(qp->tx_ctx.mpa_crc_hd, (u8 *)&crc);
<------>}
 
<------>rv = kernel_sendmsg(s, &msg, iov, num_frags, len_terminate);
<------>siw_dbg_qp(qp, "sent TERM: %s, layer %d, type %d, code %d (%d bytes)\n",
<------><------>   rv == len_terminate ? "success" : "failure",
<------><------>   __rdmap_term_layer(term), __rdmap_term_etype(term),
<------><------>   __rdmap_term_ecode(term), rv);
out:
<------>kfree(term);
<------>kfree(err_hdr);
}
 
/*
 * Handle all attrs other than state
 */
static void siw_qp_modify_nonstate(struct siw_qp *qp,
<------><------><------><------>   struct siw_qp_attrs *attrs,
<------><------><------><------>   enum siw_qp_attr_mask mask)
{
<------>if (mask & SIW_QP_ATTR_ACCESS_FLAGS) {
<------><------>if (attrs->flags & SIW_RDMA_BIND_ENABLED)
<------><------><------>qp->attrs.flags |= SIW_RDMA_BIND_ENABLED;
<------><------>else
<------><------><------>qp->attrs.flags &= ~SIW_RDMA_BIND_ENABLED;
 
<------><------>if (attrs->flags & SIW_RDMA_WRITE_ENABLED)
<------><------><------>qp->attrs.flags |= SIW_RDMA_WRITE_ENABLED;
<------><------>else
<------><------><------>qp->attrs.flags &= ~SIW_RDMA_WRITE_ENABLED;
 
<------><------>if (attrs->flags & SIW_RDMA_READ_ENABLED)
<------><------><------>qp->attrs.flags |= SIW_RDMA_READ_ENABLED;
<------><------>else
<------><------><------>qp->attrs.flags &= ~SIW_RDMA_READ_ENABLED;
<------>}
}
 
static int siw_qp_nextstate_from_idle(struct siw_qp *qp,
<------><------><------><------>      struct siw_qp_attrs *attrs,
<------><------><------><------>      enum siw_qp_attr_mask mask)
{
<------>int rv = 0;
 
<------>switch (attrs->state) {
<------>case SIW_QP_STATE_RTS:
<------><------>if (attrs->flags & SIW_MPA_CRC) {
<------><------><------>rv = siw_qp_enable_crc(qp);
<------><------><------>if (rv)
<------><------><------><------>break;
<------><------>}
<------><------>if (!(mask & SIW_QP_ATTR_LLP_HANDLE)) {
<------><------><------>siw_dbg_qp(qp, "no socket\n");
<------><------><------>rv = -EINVAL;
<------><------><------>break;
<------><------>}
<------><------>if (!(mask & SIW_QP_ATTR_MPA)) {
<------><------><------>siw_dbg_qp(qp, "no MPA\n");
<------><------><------>rv = -EINVAL;
<------><------><------>break;
<------><------>}
<------><------>/*
<------><------> * Initialize iWARP TX state
<------><------> */
<------><------>qp->tx_ctx.ddp_msn[RDMAP_UNTAGGED_QN_SEND] = 0;
<------><------>qp->tx_ctx.ddp_msn[RDMAP_UNTAGGED_QN_RDMA_READ] = 0;
<------><------>qp->tx_ctx.ddp_msn[RDMAP_UNTAGGED_QN_TERMINATE] = 0;
 
<------><------>/*
<------><------> * Initialize iWARP RX state
<------><------> */
<------><------>qp->rx_stream.ddp_msn[RDMAP_UNTAGGED_QN_SEND] = 1;
<------><------>qp->rx_stream.ddp_msn[RDMAP_UNTAGGED_QN_RDMA_READ] = 1;
<------><------>qp->rx_stream.ddp_msn[RDMAP_UNTAGGED_QN_TERMINATE] = 1;
 
<------><------>/*
<------><------> * init IRD free queue, caller has already checked
<------><------> * limits.
<------><------> */
<------><------>rv = siw_qp_readq_init(qp, attrs->irq_size,
<------><------><------><------>       attrs->orq_size);
<------><------>if (rv)
<------><------><------>break;
 
<------><------>qp->attrs.sk = attrs->sk;
<------><------>qp->attrs.state = SIW_QP_STATE_RTS;
 
<------><------>siw_dbg_qp(qp, "enter RTS: crc=%s, ord=%u, ird=%u\n",
<------><------><------>   attrs->flags & SIW_MPA_CRC ? "y" : "n",
<------><------><------>   qp->attrs.orq_size, qp->attrs.irq_size);
<------><------>break;
 
<------>case SIW_QP_STATE_ERROR:
<------><------>siw_rq_flush(qp);
<------><------>qp->attrs.state = SIW_QP_STATE_ERROR;
<------><------>if (qp->cep) {
<------><------><------>siw_cep_put(qp->cep);
<------><------><------>qp->cep = NULL;
<------><------>}
<------><------>break;
 
<------>default:
<------><------>break;
<------>}
<------>return rv;
}
 
static int siw_qp_nextstate_from_rts(struct siw_qp *qp,
<------><------><------><------>     struct siw_qp_attrs *attrs)
{
<------>int drop_conn = 0;
 
<------>switch (attrs->state) {
<------>case SIW_QP_STATE_CLOSING:
<------><------>/*
<------><------> * Verbs: move to IDLE if SQ and ORQ are empty.
<------><------> * Move to ERROR otherwise. But first of all we must
<------><------> * close the connection. So we keep CLOSING or ERROR
<------><------> * as a transient state, schedule connection drop work
<------><------> * and wait for the socket state change upcall to
<------><------> * come back closed.
<------><------> */
<------><------>if (tx_wqe(qp)->wr_status == SIW_WR_IDLE) {
<------><------><------>qp->attrs.state = SIW_QP_STATE_CLOSING;
<------><------>} else {
<------><------><------>qp->attrs.state = SIW_QP_STATE_ERROR;
<------><------><------>siw_sq_flush(qp);
<------><------>}
<------><------>siw_rq_flush(qp);
 
<------><------>drop_conn = 1;
<------><------>break;
 
<------>case SIW_QP_STATE_TERMINATE:
<------><------>qp->attrs.state = SIW_QP_STATE_TERMINATE;
 
<------><------>siw_init_terminate(qp, TERM_ERROR_LAYER_RDMAP,
<------><------><------><------>   RDMAP_ETYPE_CATASTROPHIC,
<------><------><------><------>   RDMAP_ECODE_UNSPECIFIED, 1);
<------><------>drop_conn = 1;
<------><------>break;
 
<------>case SIW_QP_STATE_ERROR:
<------><------>/*
<------><------> * This is an emergency close.
<------><------> *
<------><------> * Any in progress transmit operation will get
<------><------> * cancelled.
<------><------> * This will likely result in a protocol failure,
<------><------> * if a TX operation is in transit. The caller
<------><------> * could unconditional wait to give the current
<------><------> * operation a chance to complete.
<------><------> * Esp., how to handle the non-empty IRQ case?
<------><------> * The peer was asking for data transfer at a valid
<------><------> * point in time.
<------><------> */
<------><------>siw_sq_flush(qp);
<------><------>siw_rq_flush(qp);
<------><------>qp->attrs.state = SIW_QP_STATE_ERROR;
<------><------>drop_conn = 1;
<------><------>break;
 
<------>default:
<------><------>break;
<------>}
<------>return drop_conn;
}
 
static void siw_qp_nextstate_from_term(struct siw_qp *qp,
<------><------><------><------>       struct siw_qp_attrs *attrs)
{
<------>switch (attrs->state) {
<------>case SIW_QP_STATE_ERROR:
<------><------>siw_rq_flush(qp);
<------><------>qp->attrs.state = SIW_QP_STATE_ERROR;
 
<------><------>if (tx_wqe(qp)->wr_status != SIW_WR_IDLE)
<------><------><------>siw_sq_flush(qp);
<------><------>break;
 
<------>default:
<------><------>break;
<------>}
}
 
static int siw_qp_nextstate_from_close(struct siw_qp *qp,
<------><------><------><------>       struct siw_qp_attrs *attrs)
{
<------>int rv = 0;
 
<------>switch (attrs->state) {
<------>case SIW_QP_STATE_IDLE:
<------><------>WARN_ON(tx_wqe(qp)->wr_status != SIW_WR_IDLE);
<------><------>qp->attrs.state = SIW_QP_STATE_IDLE;
<------><------>break;
 
<------>case SIW_QP_STATE_CLOSING:
<------><------>/*
<------><------> * The LLP may already moved the QP to closing
<------><------> * due to graceful peer close init
<------><------> */
<------><------>break;
 
<------>case SIW_QP_STATE_ERROR:
<------><------>/*
<------><------> * QP was moved to CLOSING by LLP event
<------><------> * not yet seen by user.
<------><------> */
<------><------>qp->attrs.state = SIW_QP_STATE_ERROR;
 
<------><------>if (tx_wqe(qp)->wr_status != SIW_WR_IDLE)
<------><------><------>siw_sq_flush(qp);
 
<------><------>siw_rq_flush(qp);
<------><------>break;
 
<------>default:
<------><------>siw_dbg_qp(qp, "state transition undefined: %s => %s\n",
<------><------><------>   siw_qp_state_to_string[qp->attrs.state],
<------><------><------>   siw_qp_state_to_string[attrs->state]);
 
<------><------>rv = -ECONNABORTED;
<------>}
<------>return rv;
}
 
/*
 * Caller must hold qp->state_lock
 */
int siw_qp_modify(struct siw_qp *qp, struct siw_qp_attrs *attrs,
<------><------>  enum siw_qp_attr_mask mask)
{
<------>int drop_conn = 0, rv = 0;
 
<------>if (!mask)
<------><------>return 0;
 
<------>siw_dbg_qp(qp, "state: %s => %s\n",
<------><------>   siw_qp_state_to_string[qp->attrs.state],
<------><------>   siw_qp_state_to_string[attrs->state]);
 
<------>if (mask != SIW_QP_ATTR_STATE)
<------><------>siw_qp_modify_nonstate(qp, attrs, mask);
 
<------>if (!(mask & SIW_QP_ATTR_STATE))
<------><------>return 0;
 
<------>switch (qp->attrs.state) {
<------>case SIW_QP_STATE_IDLE:
<------>case SIW_QP_STATE_RTR:
<------><------>rv = siw_qp_nextstate_from_idle(qp, attrs, mask);
<------><------>break;
 
<------>case SIW_QP_STATE_RTS:
<------><------>drop_conn = siw_qp_nextstate_from_rts(qp, attrs);
<------><------>break;
 
<------>case SIW_QP_STATE_TERMINATE:
<------><------>siw_qp_nextstate_from_term(qp, attrs);
<------><------>break;
 
<------>case SIW_QP_STATE_CLOSING:
<------><------>siw_qp_nextstate_from_close(qp, attrs);
<------><------>break;
<------>default:
<------><------>break;
<------>}
<------>if (drop_conn)
<------><------>siw_qp_cm_drop(qp, 0);
 
<------>return rv;
}
 
void siw_read_to_orq(struct siw_sqe *rreq, struct siw_sqe *sqe)
{
<------>rreq->id = sqe->id;
<------>rreq->opcode = sqe->opcode;
<------>rreq->sge[0].laddr = sqe->sge[0].laddr;
<------>rreq->sge[0].length = sqe->sge[0].length;
<------>rreq->sge[0].lkey = sqe->sge[0].lkey;
<------>rreq->sge[1].lkey = sqe->sge[1].lkey;
<------>rreq->flags = sqe->flags | SIW_WQE_VALID;
<------>rreq->num_sge = 1;
}
 
static int siw_activate_tx_from_sq(struct siw_qp *qp)
{
<------>struct siw_sqe *sqe;
<------>struct siw_wqe *wqe = tx_wqe(qp);
<------>int rv = 1;
 
<------>sqe = sq_get_next(qp);
<------>if (!sqe)
<------><------>return 0;
 
<------>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) {
<------><------>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.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 (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;
 
<------><------>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);
 
<------><------>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);
<------>}
 
<------>/* 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);
<------><------>wqe->wr_status = SIW_WR_IDLE;
<------>}
<------>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.
 */
static bool siw_cq_notify_now(struct siw_cq *cq, u32 flags)
{
<------>u32 cq_notify;
 
<------>if (!cq->base_cq.comp_handler)
<------><------>return false;
 
<------>/* Read application shared notification state */
<------>cq_notify = READ_ONCE(cq->notify->flags);
 
<------>if ((cq_notify & SIW_NOTIFY_NEXT_COMPLETION) ||
<------>    ((cq_notify & SIW_NOTIFY_SOLICITED) &&
<------>     (flags & SIW_WQE_SOLICITED))) {
<------><------>/*
<------><------> * CQ notification is one-shot: Since the
<------><------> * current CQE causes user notification,
<------><------> * the CQ gets dis-aremd and must be re-aremd
<------><------> * by the user for a new notification.
<------><------> */
<------><------>WRITE_ONCE(cq->notify->flags, SIW_NOTIFY_NOT);
 
<------><------>return true;
<------>}
<------>return false;
}
 
int siw_sqe_complete(struct siw_qp *qp, struct siw_sqe *sqe, u32 bytes,
<------><------>     enum siw_wc_status status)
{
<------>struct siw_cq *cq = qp->scq;
<------>int rv = 0;
 
<------>if (cq) {
<------><------>u32 sqe_flags = sqe->flags;
<------><------>struct siw_cqe *cqe;
<------><------>u32 idx;
<------><------>unsigned long flags;
 
<------><------>spin_lock_irqsave(&cq->lock, flags);
 
<------><------>idx = cq->cq_put % cq->num_cqe;
<------><------>cqe = &cq->queue[idx];
 
<------><------>if (!READ_ONCE(cqe->flags)) {
<------><------><------>bool notify;
 
<------><------><------>cqe->id = sqe->id;
<------><------><------>cqe->opcode = sqe->opcode;
<------><------><------>cqe->status = status;
<------><------><------>cqe->imm_data = 0;
<------><------><------>cqe->bytes = bytes;
 
<------><------><------>if (rdma_is_kernel_res(&cq->base_cq.res))
<------><------><------><------>cqe->base_qp = &qp->base_qp;
<------><------><------>else
<------><------><------><------>cqe->qp_id = qp_id(qp);
 
<------><------><------>/* mark CQE valid for application */
<------><------><------>WRITE_ONCE(cqe->flags, SIW_WQE_VALID);
<------><------><------>/* recycle SQE */
<------><------><------>smp_store_mb(sqe->flags, 0);
 
<------><------><------>cq->cq_put++;
<------><------><------>notify = siw_cq_notify_now(cq, sqe_flags);
 
<------><------><------>spin_unlock_irqrestore(&cq->lock, flags);
 
<------><------><------>if (notify) {
<------><------><------><------>siw_dbg_cq(cq, "Call completion handler\n");
<------><------><------><------>cq->base_cq.comp_handler(&cq->base_cq,
<------><------><------><------><------><------>cq->base_cq.cq_context);
<------><------><------>}
<------><------>} else {
<------><------><------>spin_unlock_irqrestore(&cq->lock, flags);
<------><------><------>rv = -ENOMEM;
<------><------><------>siw_cq_event(cq, IB_EVENT_CQ_ERR);
<------><------>}
<------>} else {
<------><------>/* recycle SQE */
<------><------>smp_store_mb(sqe->flags, 0);
<------>}
<------>return rv;
}
 
int siw_rqe_complete(struct siw_qp *qp, struct siw_rqe *rqe, u32 bytes,
<------><------>     u32 inval_stag, enum siw_wc_status status)
{
<------>struct siw_cq *cq = qp->rcq;
<------>int rv = 0;
 
<------>if (cq) {
<------><------>struct siw_cqe *cqe;
<------><------>u32 idx;
<------><------>unsigned long flags;
 
<------><------>spin_lock_irqsave(&cq->lock, flags);
 
<------><------>idx = cq->cq_put % cq->num_cqe;
<------><------>cqe = &cq->queue[idx];
 
<------><------>if (!READ_ONCE(cqe->flags)) {
<------><------><------>bool notify;
<------><------><------>u8 cqe_flags = SIW_WQE_VALID;
 
<------><------><------>cqe->id = rqe->id;
<------><------><------>cqe->opcode = SIW_OP_RECEIVE;
<------><------><------>cqe->status = status;
<------><------><------>cqe->imm_data = 0;
<------><------><------>cqe->bytes = bytes;
 
<------><------><------>if (rdma_is_kernel_res(&cq->base_cq.res)) {
<------><------><------><------>cqe->base_qp = &qp->base_qp;
<------><------><------><------>if (inval_stag) {
<------><------><------><------><------>cqe_flags |= SIW_WQE_REM_INVAL;
<------><------><------><------><------>cqe->inval_stag = inval_stag;
<------><------><------><------>}
<------><------><------>} else {
<------><------><------><------>cqe->qp_id = qp_id(qp);
<------><------><------>}
<------><------><------>/* mark CQE valid for application */
<------><------><------>WRITE_ONCE(cqe->flags, cqe_flags);
<------><------><------>/* recycle RQE */
<------><------><------>smp_store_mb(rqe->flags, 0);
 
<------><------><------>cq->cq_put++;
<------><------><------>notify = siw_cq_notify_now(cq, SIW_WQE_SIGNALLED);
 
<------><------><------>spin_unlock_irqrestore(&cq->lock, flags);
 
<------><------><------>if (notify) {
<------><------><------><------>siw_dbg_cq(cq, "Call completion handler\n");
<------><------><------><------>cq->base_cq.comp_handler(&cq->base_cq,
<------><------><------><------><------><------>cq->base_cq.cq_context);
<------><------><------>}
<------><------>} else {
<------><------><------>spin_unlock_irqrestore(&cq->lock, flags);
<------><------><------>rv = -ENOMEM;
<------><------><------>siw_cq_event(cq, IB_EVENT_CQ_ERR);
<------><------>}
<------>} else {
<------><------>/* recycle RQE */
<------><------>smp_store_mb(rqe->flags, 0);
<------>}
<------>return rv;
}
 
/*
 * siw_sq_flush()
 *
 * Flush SQ and ORRQ entries to CQ.
 *
 * Must be called with QP state write lock held.
 * Therefore, SQ and ORQ lock must not be taken.
 */
void siw_sq_flush(struct siw_qp *qp)
{
<------>struct siw_sqe *sqe;
<------>struct siw_wqe *wqe = tx_wqe(qp);
<------>int async_event = 0;
 
<------>/*
<------> * Start with completing any work currently on the ORQ
<------> */
<------>while (qp->attrs.orq_size) {
<------><------>sqe = &qp->orq[qp->orq_get % qp->attrs.orq_size];
<------><------>if (!READ_ONCE(sqe->flags))
<------><------><------>break;
 
<------><------>if (siw_sqe_complete(qp, sqe, 0, SIW_WC_WR_FLUSH_ERR) != 0)
<------><------><------>break;
 
<------><------>WRITE_ONCE(sqe->flags, 0);
<------><------>qp->orq_get++;
<------>}
<------>/*
<------> * Flush an in-progress WQE if present
<------> */
<------>if (wqe->wr_status != SIW_WR_IDLE) {
<------><------>siw_dbg_qp(qp, "flush current SQE, type %d, status %d\n",
<------><------><------>   tx_type(wqe), wqe->wr_status);
 
<------><------>siw_wqe_put_mem(wqe, tx_type(wqe));
 
<------><------>if (tx_type(wqe) != SIW_OP_READ_RESPONSE &&
<------><------>    ((tx_type(wqe) != SIW_OP_READ &&
<------><------>      tx_type(wqe) != SIW_OP_READ_LOCAL_INV) ||
<------><------>     wqe->wr_status == SIW_WR_QUEUED))
<------><------><------>/*
<------><------><------> * An in-progress Read Request is already in
<------><------><------> * the ORQ
<------><------><------> */
<------><------><------>siw_sqe_complete(qp, &wqe->sqe, wqe->bytes,
<------><------><------><------><------> SIW_WC_WR_FLUSH_ERR);
 
<------><------>wqe->wr_status = SIW_WR_IDLE;
<------>}
<------>/*
<------> * Flush the Send Queue
<------> */
<------>while (qp->attrs.sq_size) {
<------><------>sqe = &qp->sendq[qp->sq_get % qp->attrs.sq_size];
<------><------>if (!READ_ONCE(sqe->flags))
<------><------><------>break;
 
<------><------>async_event = 1;
<------><------>if (siw_sqe_complete(qp, sqe, 0, SIW_WC_WR_FLUSH_ERR) != 0)
<------><------><------>/*
<------><------><------> * Shall IB_EVENT_SQ_DRAINED be supressed if work
<------><------><------> * completion fails?
<------><------><------> */
<------><------><------>break;
 
<------><------>WRITE_ONCE(sqe->flags, 0);
<------><------>qp->sq_get++;
<------>}
<------>if (async_event)
<------><------>siw_qp_event(qp, IB_EVENT_SQ_DRAINED);
}
 
/*
 * siw_rq_flush()
 *
 * Flush recv queue entries to CQ. Also
 * takes care of pending active tagged and untagged
 * inbound transfers, which have target memory
 * referenced.
 *
 * Must be called with QP state write lock held.
 * Therefore, RQ lock must not be taken.
 */
void siw_rq_flush(struct siw_qp *qp)
{
<------>struct siw_wqe *wqe = &qp->rx_untagged.wqe_active;
 
<------>/*
<------> * Flush an in-progress untagged operation if present
<------> */
<------>if (wqe->wr_status != SIW_WR_IDLE) {
<------><------>siw_dbg_qp(qp, "flush current rqe, type %d, status %d\n",
<------><------><------>   rx_type(wqe), wqe->wr_status);
 
<------><------>siw_wqe_put_mem(wqe, rx_type(wqe));
 
<------><------>if (rx_type(wqe) == SIW_OP_RECEIVE) {
<------><------><------>siw_rqe_complete(qp, &wqe->rqe, wqe->bytes,
<------><------><------><------><------> 0, SIW_WC_WR_FLUSH_ERR);
<------><------>} else if (rx_type(wqe) != SIW_OP_READ &&
<------><------><------>   rx_type(wqe) != SIW_OP_READ_RESPONSE &&
<------><------><------>   rx_type(wqe) != SIW_OP_WRITE) {
<------><------><------>siw_sqe_complete(qp, &wqe->sqe, 0, SIW_WC_WR_FLUSH_ERR);
<------><------>}
<------><------>wqe->wr_status = SIW_WR_IDLE;
<------>}
<------>wqe = &qp->rx_tagged.wqe_active;
 
<------>if (wqe->wr_status != SIW_WR_IDLE) {
<------><------>siw_wqe_put_mem(wqe, rx_type(wqe));
<------><------>wqe->wr_status = SIW_WR_IDLE;
<------>}
<------>/*
<------> * Flush the Receive Queue
<------> */
<------>while (qp->attrs.rq_size) {
<------><------>struct siw_rqe *rqe =
<------><------><------>&qp->recvq[qp->rq_get % qp->attrs.rq_size];
 
<------><------>if (!READ_ONCE(rqe->flags))
<------><------><------>break;
 
<------><------>if (siw_rqe_complete(qp, rqe, 0, 0, SIW_WC_WR_FLUSH_ERR) != 0)
<------><------><------>break;
 
<------><------>WRITE_ONCE(rqe->flags, 0);
<------><------>qp->rq_get++;
<------>}
}
 
int siw_qp_add(struct siw_device *sdev, struct siw_qp *qp)
{
<------>int rv = xa_alloc(&sdev->qp_xa, &qp->base_qp.qp_num, qp, xa_limit_32b,
<------><------><------>  GFP_KERNEL);
 
<------>if (!rv) {
<------><------>kref_init(&qp->ref);
<------><------>qp->sdev = sdev;
<------><------>siw_dbg_qp(qp, "new QP\n");
<------>}
<------>return rv;
}
 
void siw_free_qp(struct kref *ref)
{
<------>struct siw_qp *found, *qp = container_of(ref, struct siw_qp, ref);
<------>struct siw_device *sdev = qp->sdev;
<------>unsigned long flags;
 
<------>if (qp->cep)
<------><------>siw_cep_put(qp->cep);
 
<------>found = xa_erase(&sdev->qp_xa, qp_id(qp));
<------>WARN_ON(found != qp);
<------>spin_lock_irqsave(&sdev->lock, flags);
<------>list_del(&qp->devq);
<------>spin_unlock_irqrestore(&sdev->lock, flags);
 
<------>vfree(qp->sendq);
<------>vfree(qp->recvq);
<------>vfree(qp->irq);
<------>vfree(qp->orq);
 
<------>siw_put_tx_cpu(qp->tx_cpu);
 
<------>atomic_dec(&sdev->num_qp);
<------>siw_dbg_qp(qp, "free QP\n");
<------>kfree_rcu(qp, rcu);
}