On Tue, Feb 19, 2019 at 11:08:58AM +0100, Bernard Metzler wrote:
> Signed-off-by: Bernard Metzler <bmt@xxxxxxxxxxxxxx>
> ---
> drivers/infiniband/sw/siw/siw_qp.c | 1478 ++++++++++++++++++++++++++++
> 1 file changed, 1478 insertions(+)
> create mode 100644 drivers/infiniband/sw/siw/siw_qp.c
>
> diff --git a/drivers/infiniband/sw/siw/siw_qp.c b/drivers/infiniband/sw/siw/siw_qp.c
> new file mode 100644
> index 000000000000..75fd151dae39
> --- /dev/null
> +++ b/drivers/infiniband/sw/siw/siw_qp.c
> @@ -0,0 +1,1478 @@
> +// SPDX-License-Identifier: GPL-2.0 or BSD-3-Clause
> +/*
> + * Software iWARP device driver
> + *
> + * Authors: Bernard Metzler <bmt@xxxxxxxxxxxxxx>
> + *
> + * Copyright (c) 2008-2018, IBM Corporation
> + *
> + * This software is available to you under a choice of one of two
> + * licenses. You may choose to be licensed under the terms of the GNU
> + * General Public License (GPL) Version 2, available from the file
> + * COPYING in the main directory of this source tree, or the
> + * BSD license below:
> + *
> + * Redistribution and use in source and binary forms, with or
> + * without modification, are permitted provided that the following
> + * conditions are met:
> + *
> + * - Redistributions of source code must retain the above copyright notice,
> + * this list of conditions and the following disclaimer.
> + *
> + * - Redistributions in binary form must reproduce the above copyright
> + * notice, this list of conditions and the following disclaimer in the
> + * documentation and/or other materials provided with the distribution.
> + *
> + * - Neither the name of IBM nor the names of its contributors may be
> + * used to endorse or promote products derived from this software without
> + * specific prior written permission.
> + *
> + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
> + * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
> + * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
> + * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
> + * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
> + * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
> + * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
> + * SOFTWARE.
> + */
> +
> +#include <linux/errno.h>
> +#include <linux/types.h>
> +#include <linux/net.h>
> +#include <linux/file.h>
> +#include <linux/scatterlist.h>
> +#include <linux/highmem.h>
> +#include <linux/vmalloc.h>
> +#include <asm/barrier.h>
> +#include <net/sock.h>
> +#include <net/tcp_states.h>
> +#include <net/tcp.h>
> +
> +#include <rdma/iw_cm.h>
> +#include <rdma/ib_verbs.h>
> +#include <rdma/ib_smi.h>
> +#include <rdma/ib_user_verbs.h>
> +
> +#include "siw.h"
> +#include "siw_obj.h"
> +#include "siw_cm.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),
> + .proc_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),
> + .proc_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),
> + .proc_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),
> + .proc_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),
> + .proc_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),
> + .proc_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),
> + .proc_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),
> + .proc_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_ctx.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 rx, suspend: %d\n",
> + qp->rx_ctx.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_ctx.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 = sk_to_cep(sk);
> +
> + cep->sk_write_space(sk);
> +
> + if (!test_bit(SOCK_NOSPACE, &sk->sk_socket->flags))
> + (void) siw_sq_start(cep->qp);
> +}
> +
> +static int siw_qp_readq_init(struct siw_qp *qp, int irq_size, int orq_size)
> +{
> + if (!irq_size)
> + irq_size = 1;
> + if (!orq_size)
> + orq_size = 1;
> +
> + 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;
> + }
> + 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;
> + }
> + return 0;
> +}
> +
> +static int siw_qp_enable_crc(struct siw_qp *qp)
> +{
> + struct siw_iwarp_rx *c_rx = &qp->rx_ctx;
> + struct siw_iwarp_tx *c_tx = &qp->tx_ctx;
> + int rv = 0;
> +
> + if (siw_crypto_shash == NULL) {
> + rv = -ENOENT;
> + goto error;
> + }
> + c_tx->mpa_crc_hd = kzalloc(sizeof(struct shash_desc) +
> + crypto_shash_descsize(siw_crypto_shash),
> + GFP_KERNEL);
> + c_rx->mpa_crc_hd = kzalloc(sizeof(struct shash_desc) +
> + crypto_shash_descsize(siw_crypto_shash),
> + GFP_KERNEL);
> + if (!c_tx->mpa_crc_hd || !c_rx->mpa_crc_hd) {
> + rv = -ENOMEM;
> + goto error;
> + }
> + c_tx->mpa_crc_hd->tfm = siw_crypto_shash;
> + c_rx->mpa_crc_hd->tfm = siw_crypto_shash;
> +
> + return 0;
> +error:
> + siw_dbg_qp(qp, "falied loading crc32c. error %d\n", rv);
> +
> + kfree(c_tx->mpa_crc_hd);
> + kfree(c_rx->mpa_crc_hd);
> +
> + c_tx->mpa_crc_hd = c_rx->mpa_crc_hd = NULL;
> +
> + return rv;
> +}
> +
> +/*
> + * 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;
> +
> + wqe->sqe.opcode = SIW_OP_READ;
> +
> + spin_lock(&qp->orq_lock);
> +
> + 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)
> +{
> + if (state == E_STAG_INVALID)
> + return DDP_ECODE_T_INVALID_STAG;
> + if (state == E_BASE_BOUNDS)
> + return DDP_ECODE_T_BASE_BOUNDS;
> + if (state == E_PD_MISMATCH)
> + return DDP_ECODE_T_STAG_NOT_ASSOC;
> + if (state == 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;
> +
> + 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)
> +{
> + if (state == E_STAG_INVALID)
> + return RDMAP_ECODE_INVALID_STAG;
> + if (state == E_BASE_BOUNDS)
> + return RDMAP_ECODE_BASE_BOUNDS;
> + if (state == E_PD_MISMATCH)
> + return RDMAP_ECODE_STAG_NOT_ASSOC;
> + if (state == E_ACCESS_PERM)
> + return RDMAP_ECODE_ACCESS_RIGHTS;
> +
> + 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_iwarp_rx *rx_ctx = &qp->rx_ctx;
> + union iwarp_hdr *rx_hdr = &rx_ctx->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->llp.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_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_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(rx_ctx->mpa_crc_hd);
> + if (siw_crc_array(rx_ctx->mpa_crc_hd, (u8 *)iov[0].iov_base,
> + iov[0].iov_len))
> + goto out;
> +
> + if (num_frags == 3) {
> + if (siw_crc_array(rx_ctx->mpa_crc_hd,
> + (u8 *)iov[1].iov_base,
> + iov[1].iov_len))
> + goto out;
> + }
> + crypto_shash_final(rx_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;
> + }
> +}
> +
> +/*
> + * caller holds 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:
> +
> + 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;
> + }
> + siw_dbg_qp(qp, "enter rts, peer 0x%08x, loc 0x%08x\n",
> + qp->cep->llp.raddr.sin_addr.s_addr,
> + qp->cep->llp.laddr.sin_addr.s_addr);
> + /*
> + * 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_ctx.ddp_msn[RDMAP_UNTAGGED_QN_SEND] = 1;
> + qp->rx_ctx.ddp_msn[RDMAP_UNTAGGED_QN_RDMA_READ] = 1;
> + qp->rx_ctx.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;
> +
> + 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;
> +
> + case SIW_QP_STATE_RTR:
> + /* ignore */
> + 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]);
> + break;
> + }
> + break;
> +
> + case SIW_QP_STATE_RTS:
> +
> + 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:
> + 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]);
> + break;
> + }
> + break;
> +
> + case SIW_QP_STATE_TERMINATE:
> +
> + 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:
> + 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]);
> + }
> + break;
> +
> + case SIW_QP_STATE_CLOSING:
> +
> + 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]);
> +
> + return -ECONNABORTED;
> + }
> + break;
> +
> + default:
> + siw_dbg_qp(qp, " noop: state %s\n",
> + siw_qp_state_to_string[qp->attrs.state]);
> + break;
> + }
> + if (drop_conn)
> + siw_qp_cm_drop(qp, 0);
> +
> + return rv;
> +}
> +
> +struct ib_qp *siw_get_base_qp(struct ib_device *base_dev, int id)
> +{
> + struct siw_qp *qp = siw_qp_id2obj(to_siw_dev(base_dev), id);
> +
> + if (qp) {
> + /*
> + * siw_qp_id2obj() increments object reference count
> + */
> + siw_qp_put(qp);
> + siw_dbg_qp(qp, "got base QP");
> +
> + return &qp->base_qp;
> + }
> + return (struct ib_qp *)NULL;
> +}
> +
> +/*
> + * siw_check_mem()
> + *
> + * Check protection domain, STAG state, access permissions and
> + * address range for memory object.
> + *
> + * @pd: Protection Domain memory should belong to
> + * @mem: memory to be checked
> + * @addr: starting addr of mem
> + * @perms: requested access permissions
> + * @len: len of memory interval to be checked
> + *
> + */
> +int siw_check_mem(struct siw_pd *pd, struct siw_mem *mem, u64 addr,
> + enum siw_access_flags perms, int len)
> +{
> + if (siw_mem2mr(mem)->pd != pd) {
> + siw_dbg(pd->hdr.sdev, "[PD %d]: pd mismatch\n", OBJ_ID(pd));
> + return -E_PD_MISMATCH;
> + }
> + if (!mem->stag_valid) {
> + siw_dbg(pd->hdr.sdev, "[PD %d]: stag 0x%08x invalid\n",
> + OBJ_ID(pd), OBJ_ID(mem));
> + return -E_STAG_INVALID;
> + }
> + /*
> + * check access permissions
> + */
> + if ((mem->perms & perms) < perms) {
> + siw_dbg(pd->hdr.sdev, "[PD %d]: permissions 0x%08x < 0x%08x\n",
> + OBJ_ID(pd), mem->perms, perms);
> + return -E_ACCESS_PERM;
> + }
> + /*
> + * Check address interval: we relax check to allow memory shrinked
> + * from the start address _after_ placing or fetching len bytes.
> + * TODO: this relaxation is probably overdone
> + */
> + if (addr < mem->va || addr + len > mem->va + mem->len) {
> + siw_dbg(pd->hdr.sdev, "[PD %d]: MEM interval len %d\n",
> + OBJ_ID(pd), len);
> + siw_dbg(pd->hdr.sdev, "[0x%016llx, 0x%016llx) out of bounds\n",
> + (unsigned long long)addr,
> + (unsigned long long)(addr + len));
> + siw_dbg(pd->hdr.sdev, "[0x%016llx, 0x%016llx] LKey=0x%08x\n",
> + (unsigned long long)mem->va,
> + (unsigned long long)(mem->va + mem->len),
> + OBJ_ID(mem));
> +
> + return -E_BASE_BOUNDS;
> + }
> + return E_ACCESS_OK;
> +}
> +
> +/*
> + * siw_check_sge()
> + *
> + * Check SGE for access rights in given interval
> + *
> + * @pd: Protection Domain memory should belong to
> + * @sge: SGE to be checked
> + * @mem: array of memory references
> + * @perms: requested access permissions
> + * @off: starting offset in SGE
> + * @len: len of memory interval to be checked
> + *
> + * NOTE: Function references SGE's memory object (mem->obj)
> + * if not yet done. New reference is kept if check went ok and
> + * released if check failed. If mem->obj is already valid, no new
> + * lookup is being done and mem is not released it check fails.
> + */
> +int
> +siw_check_sge(struct siw_pd *pd, struct siw_sge *sge,
> + struct siw_mem *mem[], enum siw_access_flags perms,
> + u32 off, int len)
> +{
> + struct siw_device *sdev = pd->hdr.sdev;
> + int new_ref = 0, rv = E_ACCESS_OK;
> +
> + if (len + off > sge->length) {
> + rv = -E_BASE_BOUNDS;
> + goto fail;
> + }
> + if (*mem == NULL) {
> + *mem = siw_mem_id2obj(sdev, sge->lkey >> 8);
> + if (*mem == NULL) {
> + rv = -E_STAG_INVALID;
> + goto fail;
> + }
> + new_ref = 1;
> + }
> +
> + rv = siw_check_mem(pd, *mem, sge->laddr + off, perms, len);
> + if (rv)
> + goto fail;
> +
> + return 0;
> +
> +fail:
> + if (new_ref) {
> + siw_mem_put(*mem);
> + *mem = NULL;
> + }
> + 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;
> +}
> +
> +/*
> + * 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, *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;
> +
> + wqe->processed = 0;
> + qp->irq_get++;
> +
> + /* mark current IRQ entry free */
> + smp_store_mb(irqe->flags, 0);
> +
> + 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) {
> + 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 = (u64)&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);
> +
> + } 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;
> +
> + 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++;
> + } else {
> + rv = 0;
> + }
> +out:
> + if (unlikely(rv < 0)) {
> + siw_dbg_qp(qp, "error %d\n", rv);
> + wqe->wr_status = SIW_WR_IDLE;
> + }
> + return rv;
> +}
> +
> +/*
> + * 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)
> +{
> + u64 cq_notify;
> +
> + if (!cq->base_cq.comp_handler)
> + return false;
> +
> + cq_notify = READ_ONCE(*cq->notify);
> +
> + if ((cq_notify & SIW_NOTIFY_NEXT_COMPLETION) ||
> + ((cq_notify & SIW_NOTIFY_SOLICITED) &&
> + (flags & SIW_WQE_SOLICITED))) {
> + /* dis-arm CQ */
> + smp_store_mb(*cq->notify, SIW_NOTIFY_NOT);
> +
> + return true;
> + }
> + return false;
> +}
> +
> +/* Must be called without holding CQ lock */
> +static inline void siw_cq_completion(struct siw_cq *cq)
> +{
> + siw_dbg_obj(cq, "Completion\n");
> + (*cq->base_cq.comp_handler)(&cq->base_cq, cq->base_cq.cq_context);
> +}
> +
> +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 (cq->kernel_verbs) {
kernel_verbs is managed by Ib/core, why should driver know about it?
Thanks
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