diff options
Diffstat (limited to 'drivers/infiniband/sw/siw/siw_qp.c')
| -rw-r--r-- | drivers/infiniband/sw/siw/siw_qp.c | 1349 |
1 files changed, 1349 insertions, 0 deletions
diff --git a/drivers/infiniband/sw/siw/siw_qp.c b/drivers/infiniband/sw/siw/siw_qp.c new file mode 100644 index 000000000..ddb2e66f9 --- /dev/null +++ b/drivers/infiniband/sw/siw/siw_qp.c @@ -0,0 +1,1349 @@ +// 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); +} |