diff options
Diffstat (limited to 'drivers/infiniband/sw/rxe/rxe_verbs.c')
| -rw-r--r-- | drivers/infiniband/sw/rxe/rxe_verbs.c | 1187 |
1 files changed, 1187 insertions, 0 deletions
diff --git a/drivers/infiniband/sw/rxe/rxe_verbs.c b/drivers/infiniband/sw/rxe/rxe_verbs.c new file mode 100644 index 000000000..512868c23 --- /dev/null +++ b/drivers/infiniband/sw/rxe/rxe_verbs.c @@ -0,0 +1,1187 @@ +// SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB +/* + * Copyright (c) 2016 Mellanox Technologies Ltd. All rights reserved. + * Copyright (c) 2015 System Fabric Works, Inc. All rights reserved. + */ + +#include <linux/dma-mapping.h> +#include <net/addrconf.h> +#include <rdma/uverbs_ioctl.h> +#include "rxe.h" +#include "rxe_loc.h" +#include "rxe_queue.h" +#include "rxe_hw_counters.h" + +static int rxe_query_device(struct ib_device *dev, + struct ib_device_attr *attr, + struct ib_udata *uhw) +{ + struct rxe_dev *rxe = to_rdev(dev); + + if (uhw->inlen || uhw->outlen) + return -EINVAL; + + *attr = rxe->attr; + return 0; +} + +static int rxe_query_port(struct ib_device *dev, + u8 port_num, struct ib_port_attr *attr) +{ + struct rxe_dev *rxe = to_rdev(dev); + struct rxe_port *port; + int rc; + + port = &rxe->port; + + /* *attr being zeroed by the caller, avoid zeroing it here */ + *attr = port->attr; + + mutex_lock(&rxe->usdev_lock); + rc = ib_get_eth_speed(dev, port_num, &attr->active_speed, + &attr->active_width); + + if (attr->state == IB_PORT_ACTIVE) + attr->phys_state = IB_PORT_PHYS_STATE_LINK_UP; + else if (dev_get_flags(rxe->ndev) & IFF_UP) + attr->phys_state = IB_PORT_PHYS_STATE_POLLING; + else + attr->phys_state = IB_PORT_PHYS_STATE_DISABLED; + + mutex_unlock(&rxe->usdev_lock); + + return rc; +} + +static int rxe_query_pkey(struct ib_device *device, + u8 port_num, u16 index, u16 *pkey) +{ + if (index > 0) + return -EINVAL; + + *pkey = IB_DEFAULT_PKEY_FULL; + return 0; +} + +static int rxe_modify_device(struct ib_device *dev, + int mask, struct ib_device_modify *attr) +{ + struct rxe_dev *rxe = to_rdev(dev); + + if (mask & ~(IB_DEVICE_MODIFY_SYS_IMAGE_GUID | + IB_DEVICE_MODIFY_NODE_DESC)) + return -EOPNOTSUPP; + + if (mask & IB_DEVICE_MODIFY_SYS_IMAGE_GUID) + rxe->attr.sys_image_guid = cpu_to_be64(attr->sys_image_guid); + + if (mask & IB_DEVICE_MODIFY_NODE_DESC) { + memcpy(rxe->ib_dev.node_desc, + attr->node_desc, sizeof(rxe->ib_dev.node_desc)); + } + + return 0; +} + +static int rxe_modify_port(struct ib_device *dev, + u8 port_num, int mask, struct ib_port_modify *attr) +{ + struct rxe_dev *rxe = to_rdev(dev); + struct rxe_port *port; + + port = &rxe->port; + + port->attr.port_cap_flags |= attr->set_port_cap_mask; + port->attr.port_cap_flags &= ~attr->clr_port_cap_mask; + + if (mask & IB_PORT_RESET_QKEY_CNTR) + port->attr.qkey_viol_cntr = 0; + + return 0; +} + +static enum rdma_link_layer rxe_get_link_layer(struct ib_device *dev, + u8 port_num) +{ + return IB_LINK_LAYER_ETHERNET; +} + +static int rxe_alloc_ucontext(struct ib_ucontext *uctx, struct ib_udata *udata) +{ + struct rxe_dev *rxe = to_rdev(uctx->device); + struct rxe_ucontext *uc = to_ruc(uctx); + + return rxe_add_to_pool(&rxe->uc_pool, &uc->pelem); +} + +static void rxe_dealloc_ucontext(struct ib_ucontext *ibuc) +{ + struct rxe_ucontext *uc = to_ruc(ibuc); + + rxe_drop_ref(uc); +} + +static int rxe_port_immutable(struct ib_device *dev, u8 port_num, + struct ib_port_immutable *immutable) +{ + int err; + struct ib_port_attr attr; + + immutable->core_cap_flags = RDMA_CORE_PORT_IBA_ROCE_UDP_ENCAP; + + err = ib_query_port(dev, port_num, &attr); + if (err) + return err; + + immutable->pkey_tbl_len = attr.pkey_tbl_len; + immutable->gid_tbl_len = attr.gid_tbl_len; + immutable->max_mad_size = IB_MGMT_MAD_SIZE; + + return 0; +} + +static int rxe_alloc_pd(struct ib_pd *ibpd, struct ib_udata *udata) +{ + struct rxe_dev *rxe = to_rdev(ibpd->device); + struct rxe_pd *pd = to_rpd(ibpd); + + return rxe_add_to_pool(&rxe->pd_pool, &pd->pelem); +} + +static int rxe_dealloc_pd(struct ib_pd *ibpd, struct ib_udata *udata) +{ + struct rxe_pd *pd = to_rpd(ibpd); + + rxe_drop_ref(pd); + return 0; +} + +static int rxe_create_ah(struct ib_ah *ibah, + struct rdma_ah_init_attr *init_attr, + struct ib_udata *udata) + +{ + int err; + struct rxe_dev *rxe = to_rdev(ibah->device); + struct rxe_ah *ah = to_rah(ibah); + + err = rxe_av_chk_attr(rxe, init_attr->ah_attr); + if (err) + return err; + + err = rxe_add_to_pool(&rxe->ah_pool, &ah->pelem); + if (err) + return err; + + rxe_init_av(init_attr->ah_attr, &ah->av); + return 0; +} + +static int rxe_modify_ah(struct ib_ah *ibah, struct rdma_ah_attr *attr) +{ + int err; + struct rxe_dev *rxe = to_rdev(ibah->device); + struct rxe_ah *ah = to_rah(ibah); + + err = rxe_av_chk_attr(rxe, attr); + if (err) + return err; + + rxe_init_av(attr, &ah->av); + return 0; +} + +static int rxe_query_ah(struct ib_ah *ibah, struct rdma_ah_attr *attr) +{ + struct rxe_ah *ah = to_rah(ibah); + + memset(attr, 0, sizeof(*attr)); + attr->type = ibah->type; + rxe_av_to_attr(&ah->av, attr); + return 0; +} + +static int rxe_destroy_ah(struct ib_ah *ibah, u32 flags) +{ + struct rxe_ah *ah = to_rah(ibah); + + rxe_drop_ref(ah); + return 0; +} + +static int post_one_recv(struct rxe_rq *rq, const struct ib_recv_wr *ibwr) +{ + int err; + int i; + u32 length; + struct rxe_recv_wqe *recv_wqe; + int num_sge = ibwr->num_sge; + + if (unlikely(queue_full(rq->queue))) { + err = -ENOMEM; + goto err1; + } + + if (unlikely(num_sge > rq->max_sge)) { + err = -EINVAL; + goto err1; + } + + length = 0; + for (i = 0; i < num_sge; i++) + length += ibwr->sg_list[i].length; + + recv_wqe = producer_addr(rq->queue); + recv_wqe->wr_id = ibwr->wr_id; + recv_wqe->num_sge = num_sge; + + memcpy(recv_wqe->dma.sge, ibwr->sg_list, + num_sge * sizeof(struct ib_sge)); + + recv_wqe->dma.length = length; + recv_wqe->dma.resid = length; + recv_wqe->dma.num_sge = num_sge; + recv_wqe->dma.cur_sge = 0; + recv_wqe->dma.sge_offset = 0; + + /* make sure all changes to the work queue are written before we + * update the producer pointer + */ + smp_wmb(); + + advance_producer(rq->queue); + return 0; + +err1: + return err; +} + +static int rxe_create_srq(struct ib_srq *ibsrq, struct ib_srq_init_attr *init, + struct ib_udata *udata) +{ + int err; + struct rxe_dev *rxe = to_rdev(ibsrq->device); + struct rxe_pd *pd = to_rpd(ibsrq->pd); + struct rxe_srq *srq = to_rsrq(ibsrq); + struct rxe_create_srq_resp __user *uresp = NULL; + + if (udata) { + if (udata->outlen < sizeof(*uresp)) + return -EINVAL; + uresp = udata->outbuf; + } + + err = rxe_srq_chk_attr(rxe, NULL, &init->attr, IB_SRQ_INIT_MASK); + if (err) + goto err1; + + err = rxe_add_to_pool(&rxe->srq_pool, &srq->pelem); + if (err) + goto err1; + + rxe_add_ref(pd); + srq->pd = pd; + + err = rxe_srq_from_init(rxe, srq, init, udata, uresp); + if (err) + goto err2; + + return 0; + +err2: + rxe_drop_ref(pd); + rxe_drop_ref(srq); +err1: + return err; +} + +static int rxe_modify_srq(struct ib_srq *ibsrq, struct ib_srq_attr *attr, + enum ib_srq_attr_mask mask, + struct ib_udata *udata) +{ + int err; + struct rxe_srq *srq = to_rsrq(ibsrq); + struct rxe_dev *rxe = to_rdev(ibsrq->device); + struct rxe_modify_srq_cmd ucmd = {}; + + if (udata) { + if (udata->inlen < sizeof(ucmd)) + return -EINVAL; + + err = ib_copy_from_udata(&ucmd, udata, sizeof(ucmd)); + if (err) + return err; + } + + err = rxe_srq_chk_attr(rxe, srq, attr, mask); + if (err) + goto err1; + + err = rxe_srq_from_attr(rxe, srq, attr, mask, &ucmd, udata); + if (err) + goto err1; + + return 0; + +err1: + return err; +} + +static int rxe_query_srq(struct ib_srq *ibsrq, struct ib_srq_attr *attr) +{ + struct rxe_srq *srq = to_rsrq(ibsrq); + + if (srq->error) + return -EINVAL; + + attr->max_wr = srq->rq.queue->buf->index_mask; + attr->max_sge = srq->rq.max_sge; + attr->srq_limit = srq->limit; + return 0; +} + +static int rxe_destroy_srq(struct ib_srq *ibsrq, struct ib_udata *udata) +{ + struct rxe_srq *srq = to_rsrq(ibsrq); + + if (srq->rq.queue) + rxe_queue_cleanup(srq->rq.queue); + + rxe_drop_ref(srq->pd); + rxe_drop_ref(srq); + return 0; +} + +static int rxe_post_srq_recv(struct ib_srq *ibsrq, const struct ib_recv_wr *wr, + const struct ib_recv_wr **bad_wr) +{ + int err = 0; + unsigned long flags; + struct rxe_srq *srq = to_rsrq(ibsrq); + + spin_lock_irqsave(&srq->rq.producer_lock, flags); + + while (wr) { + err = post_one_recv(&srq->rq, wr); + if (unlikely(err)) + break; + wr = wr->next; + } + + spin_unlock_irqrestore(&srq->rq.producer_lock, flags); + + if (err) + *bad_wr = wr; + + return err; +} + +static struct ib_qp *rxe_create_qp(struct ib_pd *ibpd, + struct ib_qp_init_attr *init, + struct ib_udata *udata) +{ + int err; + struct rxe_dev *rxe = to_rdev(ibpd->device); + struct rxe_pd *pd = to_rpd(ibpd); + struct rxe_qp *qp; + struct rxe_create_qp_resp __user *uresp = NULL; + + if (udata) { + if (udata->outlen < sizeof(*uresp)) + return ERR_PTR(-EINVAL); + uresp = udata->outbuf; + } + + err = rxe_qp_chk_init(rxe, init); + if (err) + goto err1; + + qp = rxe_alloc(&rxe->qp_pool); + if (!qp) { + err = -ENOMEM; + goto err1; + } + + if (udata) { + if (udata->inlen) { + err = -EINVAL; + goto err2; + } + qp->is_user = 1; + } + + rxe_add_index(qp); + + err = rxe_qp_from_init(rxe, qp, pd, init, uresp, ibpd, udata); + if (err) + goto err3; + + return &qp->ibqp; + +err3: + rxe_drop_index(qp); +err2: + rxe_drop_ref(qp); +err1: + return ERR_PTR(err); +} + +static int rxe_modify_qp(struct ib_qp *ibqp, struct ib_qp_attr *attr, + int mask, struct ib_udata *udata) +{ + int err; + struct rxe_dev *rxe = to_rdev(ibqp->device); + struct rxe_qp *qp = to_rqp(ibqp); + + err = rxe_qp_chk_attr(rxe, qp, attr, mask); + if (err) + goto err1; + + err = rxe_qp_from_attr(qp, attr, mask, udata); + if (err) + goto err1; + + return 0; + +err1: + return err; +} + +static int rxe_query_qp(struct ib_qp *ibqp, struct ib_qp_attr *attr, + int mask, struct ib_qp_init_attr *init) +{ + struct rxe_qp *qp = to_rqp(ibqp); + + rxe_qp_to_init(qp, init); + rxe_qp_to_attr(qp, attr, mask); + + return 0; +} + +static int rxe_destroy_qp(struct ib_qp *ibqp, struct ib_udata *udata) +{ + struct rxe_qp *qp = to_rqp(ibqp); + + rxe_qp_destroy(qp); + rxe_drop_index(qp); + rxe_drop_ref(qp); + return 0; +} + +static int validate_send_wr(struct rxe_qp *qp, const struct ib_send_wr *ibwr, + unsigned int mask, unsigned int length) +{ + int num_sge = ibwr->num_sge; + struct rxe_sq *sq = &qp->sq; + + if (unlikely(num_sge > sq->max_sge)) + goto err1; + + if (unlikely(mask & WR_ATOMIC_MASK)) { + if (length < 8) + goto err1; + + if (atomic_wr(ibwr)->remote_addr & 0x7) + goto err1; + } + + if (unlikely((ibwr->send_flags & IB_SEND_INLINE) && + (length > sq->max_inline))) + goto err1; + + return 0; + +err1: + return -EINVAL; +} + +static void init_send_wr(struct rxe_qp *qp, struct rxe_send_wr *wr, + const struct ib_send_wr *ibwr) +{ + wr->wr_id = ibwr->wr_id; + wr->num_sge = ibwr->num_sge; + wr->opcode = ibwr->opcode; + wr->send_flags = ibwr->send_flags; + + if (qp_type(qp) == IB_QPT_UD || + qp_type(qp) == IB_QPT_SMI || + qp_type(qp) == IB_QPT_GSI) { + wr->wr.ud.remote_qpn = ud_wr(ibwr)->remote_qpn; + wr->wr.ud.remote_qkey = ud_wr(ibwr)->remote_qkey; + if (qp_type(qp) == IB_QPT_GSI) + wr->wr.ud.pkey_index = ud_wr(ibwr)->pkey_index; + if (wr->opcode == IB_WR_SEND_WITH_IMM) + wr->ex.imm_data = ibwr->ex.imm_data; + } else { + switch (wr->opcode) { + case IB_WR_RDMA_WRITE_WITH_IMM: + wr->ex.imm_data = ibwr->ex.imm_data; + fallthrough; + case IB_WR_RDMA_READ: + case IB_WR_RDMA_WRITE: + wr->wr.rdma.remote_addr = rdma_wr(ibwr)->remote_addr; + wr->wr.rdma.rkey = rdma_wr(ibwr)->rkey; + break; + case IB_WR_SEND_WITH_IMM: + wr->ex.imm_data = ibwr->ex.imm_data; + break; + case IB_WR_SEND_WITH_INV: + wr->ex.invalidate_rkey = ibwr->ex.invalidate_rkey; + break; + case IB_WR_ATOMIC_CMP_AND_SWP: + case IB_WR_ATOMIC_FETCH_AND_ADD: + wr->wr.atomic.remote_addr = + atomic_wr(ibwr)->remote_addr; + wr->wr.atomic.compare_add = + atomic_wr(ibwr)->compare_add; + wr->wr.atomic.swap = atomic_wr(ibwr)->swap; + wr->wr.atomic.rkey = atomic_wr(ibwr)->rkey; + break; + case IB_WR_LOCAL_INV: + wr->ex.invalidate_rkey = ibwr->ex.invalidate_rkey; + break; + case IB_WR_REG_MR: + wr->wr.reg.mr = reg_wr(ibwr)->mr; + wr->wr.reg.key = reg_wr(ibwr)->key; + wr->wr.reg.access = reg_wr(ibwr)->access; + break; + default: + break; + } + } +} + +static int init_send_wqe(struct rxe_qp *qp, const struct ib_send_wr *ibwr, + unsigned int mask, unsigned int length, + struct rxe_send_wqe *wqe) +{ + int num_sge = ibwr->num_sge; + struct ib_sge *sge; + int i; + u8 *p; + + init_send_wr(qp, &wqe->wr, ibwr); + + if (qp_type(qp) == IB_QPT_UD || + qp_type(qp) == IB_QPT_SMI || + qp_type(qp) == IB_QPT_GSI) + memcpy(&wqe->av, &to_rah(ud_wr(ibwr)->ah)->av, sizeof(wqe->av)); + + if (unlikely(ibwr->send_flags & IB_SEND_INLINE)) { + p = wqe->dma.inline_data; + + sge = ibwr->sg_list; + for (i = 0; i < num_sge; i++, sge++) { + memcpy(p, (void *)(uintptr_t)sge->addr, + sge->length); + + p += sge->length; + } + } else if (mask & WR_REG_MASK) { + wqe->mask = mask; + wqe->state = wqe_state_posted; + return 0; + } else + memcpy(wqe->dma.sge, ibwr->sg_list, + num_sge * sizeof(struct ib_sge)); + + wqe->iova = mask & WR_ATOMIC_MASK ? atomic_wr(ibwr)->remote_addr : + mask & WR_READ_OR_WRITE_MASK ? rdma_wr(ibwr)->remote_addr : 0; + wqe->mask = mask; + wqe->dma.length = length; + wqe->dma.resid = length; + wqe->dma.num_sge = num_sge; + wqe->dma.cur_sge = 0; + wqe->dma.sge_offset = 0; + wqe->state = wqe_state_posted; + wqe->ssn = atomic_add_return(1, &qp->ssn); + + return 0; +} + +static int post_one_send(struct rxe_qp *qp, const struct ib_send_wr *ibwr, + unsigned int mask, u32 length) +{ + int err; + struct rxe_sq *sq = &qp->sq; + struct rxe_send_wqe *send_wqe; + unsigned long flags; + + err = validate_send_wr(qp, ibwr, mask, length); + if (err) + return err; + + spin_lock_irqsave(&qp->sq.sq_lock, flags); + + if (unlikely(queue_full(sq->queue))) { + err = -ENOMEM; + goto err1; + } + + send_wqe = producer_addr(sq->queue); + + err = init_send_wqe(qp, ibwr, mask, length, send_wqe); + if (unlikely(err)) + goto err1; + + /* + * make sure all changes to the work queue are + * written before we update the producer pointer + */ + smp_wmb(); + + advance_producer(sq->queue); + spin_unlock_irqrestore(&qp->sq.sq_lock, flags); + + return 0; + +err1: + spin_unlock_irqrestore(&qp->sq.sq_lock, flags); + return err; +} + +static int rxe_post_send_kernel(struct rxe_qp *qp, const struct ib_send_wr *wr, + const struct ib_send_wr **bad_wr) +{ + int err = 0; + unsigned int mask; + unsigned int length = 0; + int i; + struct ib_send_wr *next; + + while (wr) { + mask = wr_opcode_mask(wr->opcode, qp); + if (unlikely(!mask)) { + err = -EINVAL; + *bad_wr = wr; + break; + } + + if (unlikely((wr->send_flags & IB_SEND_INLINE) && + !(mask & WR_INLINE_MASK))) { + err = -EINVAL; + *bad_wr = wr; + break; + } + + next = wr->next; + + length = 0; + for (i = 0; i < wr->num_sge; i++) + length += wr->sg_list[i].length; + + err = post_one_send(qp, wr, mask, length); + + if (err) { + *bad_wr = wr; + break; + } + wr = next; + } + + rxe_run_task(&qp->req.task, 1); + if (unlikely(qp->req.state == QP_STATE_ERROR)) + rxe_run_task(&qp->comp.task, 1); + + return err; +} + +static int rxe_post_send(struct ib_qp *ibqp, const struct ib_send_wr *wr, + const struct ib_send_wr **bad_wr) +{ + struct rxe_qp *qp = to_rqp(ibqp); + + if (unlikely(!qp->valid)) { + *bad_wr = wr; + return -EINVAL; + } + + if (unlikely(qp->req.state < QP_STATE_READY)) { + *bad_wr = wr; + return -EINVAL; + } + + if (qp->is_user) { + /* Utilize process context to do protocol processing */ + rxe_run_task(&qp->req.task, 0); + return 0; + } else + return rxe_post_send_kernel(qp, wr, bad_wr); +} + +static int rxe_post_recv(struct ib_qp *ibqp, const struct ib_recv_wr *wr, + const struct ib_recv_wr **bad_wr) +{ + int err = 0; + struct rxe_qp *qp = to_rqp(ibqp); + struct rxe_rq *rq = &qp->rq; + unsigned long flags; + + if (unlikely((qp_state(qp) < IB_QPS_INIT) || !qp->valid)) { + *bad_wr = wr; + err = -EINVAL; + goto err1; + } + + if (unlikely(qp->srq)) { + *bad_wr = wr; + err = -EINVAL; + goto err1; + } + + spin_lock_irqsave(&rq->producer_lock, flags); + + while (wr) { + err = post_one_recv(rq, wr); + if (unlikely(err)) { + *bad_wr = wr; + break; + } + wr = wr->next; + } + + spin_unlock_irqrestore(&rq->producer_lock, flags); + + if (qp->resp.state == QP_STATE_ERROR) + rxe_run_task(&qp->resp.task, 1); + +err1: + return err; +} + +static int rxe_create_cq(struct ib_cq *ibcq, const struct ib_cq_init_attr *attr, + struct ib_udata *udata) +{ + int err; + struct ib_device *dev = ibcq->device; + struct rxe_dev *rxe = to_rdev(dev); + struct rxe_cq *cq = to_rcq(ibcq); + struct rxe_create_cq_resp __user *uresp = NULL; + + if (udata) { + if (udata->outlen < sizeof(*uresp)) + return -EINVAL; + uresp = udata->outbuf; + } + + if (attr->flags) + return -EINVAL; + + err = rxe_cq_chk_attr(rxe, NULL, attr->cqe, attr->comp_vector); + if (err) + return err; + + err = rxe_cq_from_init(rxe, cq, attr->cqe, attr->comp_vector, udata, + uresp); + if (err) + return err; + + return rxe_add_to_pool(&rxe->cq_pool, &cq->pelem); +} + +static int rxe_destroy_cq(struct ib_cq *ibcq, struct ib_udata *udata) +{ + struct rxe_cq *cq = to_rcq(ibcq); + + rxe_cq_disable(cq); + + rxe_drop_ref(cq); + return 0; +} + +static int rxe_resize_cq(struct ib_cq *ibcq, int cqe, struct ib_udata *udata) +{ + int err; + struct rxe_cq *cq = to_rcq(ibcq); + struct rxe_dev *rxe = to_rdev(ibcq->device); + struct rxe_resize_cq_resp __user *uresp = NULL; + + if (udata) { + if (udata->outlen < sizeof(*uresp)) + return -EINVAL; + uresp = udata->outbuf; + } + + err = rxe_cq_chk_attr(rxe, cq, cqe, 0); + if (err) + goto err1; + + err = rxe_cq_resize_queue(cq, cqe, uresp, udata); + if (err) + goto err1; + + return 0; + +err1: + return err; +} + +static int rxe_poll_cq(struct ib_cq *ibcq, int num_entries, struct ib_wc *wc) +{ + int i; + struct rxe_cq *cq = to_rcq(ibcq); + struct rxe_cqe *cqe; + unsigned long flags; + + spin_lock_irqsave(&cq->cq_lock, flags); + for (i = 0; i < num_entries; i++) { + cqe = queue_head(cq->queue); + if (!cqe) + break; + + memcpy(wc++, &cqe->ibwc, sizeof(*wc)); + advance_consumer(cq->queue); + } + spin_unlock_irqrestore(&cq->cq_lock, flags); + + return i; +} + +static int rxe_peek_cq(struct ib_cq *ibcq, int wc_cnt) +{ + struct rxe_cq *cq = to_rcq(ibcq); + int count = queue_count(cq->queue); + + return (count > wc_cnt) ? wc_cnt : count; +} + +static int rxe_req_notify_cq(struct ib_cq *ibcq, enum ib_cq_notify_flags flags) +{ + struct rxe_cq *cq = to_rcq(ibcq); + unsigned long irq_flags; + int ret = 0; + + spin_lock_irqsave(&cq->cq_lock, irq_flags); + if (cq->notify != IB_CQ_NEXT_COMP) + cq->notify = flags & IB_CQ_SOLICITED_MASK; + + if ((flags & IB_CQ_REPORT_MISSED_EVENTS) && !queue_empty(cq->queue)) + ret = 1; + + spin_unlock_irqrestore(&cq->cq_lock, irq_flags); + + return ret; +} + +static struct ib_mr *rxe_get_dma_mr(struct ib_pd *ibpd, int access) +{ + struct rxe_dev *rxe = to_rdev(ibpd->device); + struct rxe_pd *pd = to_rpd(ibpd); + struct rxe_mem *mr; + + mr = rxe_alloc(&rxe->mr_pool); + if (!mr) + return ERR_PTR(-ENOMEM); + + rxe_add_index(mr); + rxe_add_ref(pd); + rxe_mem_init_dma(pd, access, mr); + + return &mr->ibmr; +} + +static struct ib_mr *rxe_reg_user_mr(struct ib_pd *ibpd, + u64 start, + u64 length, + u64 iova, + int access, struct ib_udata *udata) +{ + int err; + struct rxe_dev *rxe = to_rdev(ibpd->device); + struct rxe_pd *pd = to_rpd(ibpd); + struct rxe_mem *mr; + + mr = rxe_alloc(&rxe->mr_pool); + if (!mr) { + err = -ENOMEM; + goto err2; + } + + rxe_add_index(mr); + + rxe_add_ref(pd); + + err = rxe_mem_init_user(pd, start, length, iova, + access, udata, mr); + if (err) + goto err3; + + return &mr->ibmr; + +err3: + rxe_drop_ref(pd); + rxe_drop_index(mr); + rxe_drop_ref(mr); +err2: + return ERR_PTR(err); +} + +static int rxe_dereg_mr(struct ib_mr *ibmr, struct ib_udata *udata) +{ + struct rxe_mem *mr = to_rmr(ibmr); + + mr->state = RXE_MEM_STATE_ZOMBIE; + rxe_drop_ref(mr_pd(mr)); + rxe_drop_index(mr); + rxe_drop_ref(mr); + return 0; +} + +static struct ib_mr *rxe_alloc_mr(struct ib_pd *ibpd, enum ib_mr_type mr_type, + u32 max_num_sg) +{ + struct rxe_dev *rxe = to_rdev(ibpd->device); + struct rxe_pd *pd = to_rpd(ibpd); + struct rxe_mem *mr; + int err; + + if (mr_type != IB_MR_TYPE_MEM_REG) + return ERR_PTR(-EINVAL); + + mr = rxe_alloc(&rxe->mr_pool); + if (!mr) { + err = -ENOMEM; + goto err1; + } + + rxe_add_index(mr); + + rxe_add_ref(pd); + + err = rxe_mem_init_fast(pd, max_num_sg, mr); + if (err) + goto err2; + + return &mr->ibmr; + +err2: + rxe_drop_ref(pd); + rxe_drop_index(mr); + rxe_drop_ref(mr); +err1: + return ERR_PTR(err); +} + +static int rxe_set_page(struct ib_mr *ibmr, u64 addr) +{ + struct rxe_mem *mr = to_rmr(ibmr); + struct rxe_map *map; + struct rxe_phys_buf *buf; + + if (unlikely(mr->nbuf == mr->num_buf)) + return -ENOMEM; + + map = mr->map[mr->nbuf / RXE_BUF_PER_MAP]; + buf = &map->buf[mr->nbuf % RXE_BUF_PER_MAP]; + + buf->addr = addr; + buf->size = ibmr->page_size; + mr->nbuf++; + + return 0; +} + +static int rxe_map_mr_sg(struct ib_mr *ibmr, struct scatterlist *sg, + int sg_nents, unsigned int *sg_offset) +{ + struct rxe_mem *mr = to_rmr(ibmr); + int n; + + mr->nbuf = 0; + + n = ib_sg_to_pages(ibmr, sg, sg_nents, sg_offset, rxe_set_page); + + mr->va = ibmr->iova; + mr->iova = ibmr->iova; + mr->length = ibmr->length; + mr->page_shift = ilog2(ibmr->page_size); + mr->page_mask = ibmr->page_size - 1; + mr->offset = mr->iova & mr->page_mask; + + return n; +} + +static int rxe_attach_mcast(struct ib_qp *ibqp, union ib_gid *mgid, u16 mlid) +{ + int err; + struct rxe_dev *rxe = to_rdev(ibqp->device); + struct rxe_qp *qp = to_rqp(ibqp); + struct rxe_mc_grp *grp; + + /* takes a ref on grp if successful */ + err = rxe_mcast_get_grp(rxe, mgid, &grp); + if (err) + return err; + + err = rxe_mcast_add_grp_elem(rxe, qp, grp); + + rxe_drop_ref(grp); + return err; +} + +static int rxe_detach_mcast(struct ib_qp *ibqp, union ib_gid *mgid, u16 mlid) +{ + struct rxe_dev *rxe = to_rdev(ibqp->device); + struct rxe_qp *qp = to_rqp(ibqp); + + return rxe_mcast_drop_grp_elem(rxe, qp, mgid); +} + +static ssize_t parent_show(struct device *device, + struct device_attribute *attr, char *buf) +{ + struct rxe_dev *rxe = + rdma_device_to_drv_device(device, struct rxe_dev, ib_dev); + + return scnprintf(buf, PAGE_SIZE, "%s\n", rxe_parent_name(rxe, 1)); +} + +static DEVICE_ATTR_RO(parent); + +static struct attribute *rxe_dev_attributes[] = { + &dev_attr_parent.attr, + NULL +}; + +static const struct attribute_group rxe_attr_group = { + .attrs = rxe_dev_attributes, +}; + +static int rxe_enable_driver(struct ib_device *ib_dev) +{ + struct rxe_dev *rxe = container_of(ib_dev, struct rxe_dev, ib_dev); + + rxe_set_port_state(rxe); + dev_info(&rxe->ib_dev.dev, "added %s\n", netdev_name(rxe->ndev)); + return 0; +} + +static const struct ib_device_ops rxe_dev_ops = { + .owner = THIS_MODULE, + .driver_id = RDMA_DRIVER_RXE, + .uverbs_abi_ver = RXE_UVERBS_ABI_VERSION, + + .alloc_hw_stats = rxe_ib_alloc_hw_stats, + .alloc_mr = rxe_alloc_mr, + .alloc_pd = rxe_alloc_pd, + .alloc_ucontext = rxe_alloc_ucontext, + .attach_mcast = rxe_attach_mcast, + .create_ah = rxe_create_ah, + .create_cq = rxe_create_cq, + .create_qp = rxe_create_qp, + .create_srq = rxe_create_srq, + .dealloc_driver = rxe_dealloc, + .dealloc_pd = rxe_dealloc_pd, + .dealloc_ucontext = rxe_dealloc_ucontext, + .dereg_mr = rxe_dereg_mr, + .destroy_ah = rxe_destroy_ah, + .destroy_cq = rxe_destroy_cq, + .destroy_qp = rxe_destroy_qp, + .destroy_srq = rxe_destroy_srq, + .detach_mcast = rxe_detach_mcast, + .enable_driver = rxe_enable_driver, + .get_dma_mr = rxe_get_dma_mr, + .get_hw_stats = rxe_ib_get_hw_stats, + .get_link_layer = rxe_get_link_layer, + .get_port_immutable = rxe_port_immutable, + .map_mr_sg = rxe_map_mr_sg, + .mmap = rxe_mmap, + .modify_ah = rxe_modify_ah, + .modify_device = rxe_modify_device, + .modify_port = rxe_modify_port, + .modify_qp = rxe_modify_qp, + .modify_srq = rxe_modify_srq, + .peek_cq = rxe_peek_cq, + .poll_cq = rxe_poll_cq, + .post_recv = rxe_post_recv, + .post_send = rxe_post_send, + .post_srq_recv = rxe_post_srq_recv, + .query_ah = rxe_query_ah, + .query_device = rxe_query_device, + .query_pkey = rxe_query_pkey, + .query_port = rxe_query_port, + .query_qp = rxe_query_qp, + .query_srq = rxe_query_srq, + .reg_user_mr = rxe_reg_user_mr, + .req_notify_cq = rxe_req_notify_cq, + .resize_cq = rxe_resize_cq, + + INIT_RDMA_OBJ_SIZE(ib_ah, rxe_ah, ibah), + INIT_RDMA_OBJ_SIZE(ib_cq, rxe_cq, ibcq), + INIT_RDMA_OBJ_SIZE(ib_pd, rxe_pd, ibpd), + INIT_RDMA_OBJ_SIZE(ib_srq, rxe_srq, ibsrq), + INIT_RDMA_OBJ_SIZE(ib_ucontext, rxe_ucontext, ibuc), +}; + +int rxe_register_device(struct rxe_dev *rxe, const char *ibdev_name) +{ + int err; + struct ib_device *dev = &rxe->ib_dev; + struct crypto_shash *tfm; + + strlcpy(dev->node_desc, "rxe", sizeof(dev->node_desc)); + + dev->node_type = RDMA_NODE_IB_CA; + dev->phys_port_cnt = 1; + dev->num_comp_vectors = num_possible_cpus(); + dev->local_dma_lkey = 0; + addrconf_addr_eui48((unsigned char *)&dev->node_guid, + rxe->ndev->dev_addr); + + dev->uverbs_cmd_mask = BIT_ULL(IB_USER_VERBS_CMD_GET_CONTEXT) + | BIT_ULL(IB_USER_VERBS_CMD_CREATE_COMP_CHANNEL) + | BIT_ULL(IB_USER_VERBS_CMD_QUERY_DEVICE) + | BIT_ULL(IB_USER_VERBS_CMD_QUERY_PORT) + | BIT_ULL(IB_USER_VERBS_CMD_ALLOC_PD) + | BIT_ULL(IB_USER_VERBS_CMD_DEALLOC_PD) + | BIT_ULL(IB_USER_VERBS_CMD_CREATE_SRQ) + | BIT_ULL(IB_USER_VERBS_CMD_MODIFY_SRQ) + | BIT_ULL(IB_USER_VERBS_CMD_QUERY_SRQ) + | BIT_ULL(IB_USER_VERBS_CMD_DESTROY_SRQ) + | BIT_ULL(IB_USER_VERBS_CMD_POST_SRQ_RECV) + | BIT_ULL(IB_USER_VERBS_CMD_CREATE_QP) + | BIT_ULL(IB_USER_VERBS_CMD_MODIFY_QP) + | BIT_ULL(IB_USER_VERBS_CMD_QUERY_QP) + | BIT_ULL(IB_USER_VERBS_CMD_DESTROY_QP) + | BIT_ULL(IB_USER_VERBS_CMD_POST_SEND) + | BIT_ULL(IB_USER_VERBS_CMD_POST_RECV) + | BIT_ULL(IB_USER_VERBS_CMD_CREATE_CQ) + | BIT_ULL(IB_USER_VERBS_CMD_RESIZE_CQ) + | BIT_ULL(IB_USER_VERBS_CMD_DESTROY_CQ) + | BIT_ULL(IB_USER_VERBS_CMD_POLL_CQ) + | BIT_ULL(IB_USER_VERBS_CMD_PEEK_CQ) + | BIT_ULL(IB_USER_VERBS_CMD_REQ_NOTIFY_CQ) + | BIT_ULL(IB_USER_VERBS_CMD_REG_MR) + | BIT_ULL(IB_USER_VERBS_CMD_DEREG_MR) + | BIT_ULL(IB_USER_VERBS_CMD_CREATE_AH) + | BIT_ULL(IB_USER_VERBS_CMD_MODIFY_AH) + | BIT_ULL(IB_USER_VERBS_CMD_QUERY_AH) + | BIT_ULL(IB_USER_VERBS_CMD_DESTROY_AH) + | BIT_ULL(IB_USER_VERBS_CMD_ATTACH_MCAST) + | BIT_ULL(IB_USER_VERBS_CMD_DETACH_MCAST) + ; + + ib_set_device_ops(dev, &rxe_dev_ops); + err = ib_device_set_netdev(&rxe->ib_dev, rxe->ndev, 1); + if (err) + return err; + + tfm = crypto_alloc_shash("crc32", 0, 0); + if (IS_ERR(tfm)) { + pr_err("failed to allocate crc algorithm err:%ld\n", + PTR_ERR(tfm)); + return PTR_ERR(tfm); + } + rxe->tfm = tfm; + + rdma_set_device_sysfs_group(dev, &rxe_attr_group); + err = ib_register_device(dev, ibdev_name, NULL); + if (err) + pr_warn("%s failed with error %d\n", __func__, err); + + /* + * Note that rxe may be invalid at this point if another thread + * unregistered it. + */ + return err; +} |