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linux-zen-server/drivers/infiniband/sw/siw/siw_verbs.c

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// 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/uaccess.h>
#include <linux/vmalloc.h>
#include <linux/xarray.h>
#include <net/addrconf.h>
#include <rdma/iw_cm.h>
#include <rdma/ib_verbs.h>
#include <rdma/ib_user_verbs.h>
#include <rdma/uverbs_ioctl.h>
#include "siw.h"
#include "siw_verbs.h"
#include "siw_mem.h"
static int ib_qp_state_to_siw_qp_state[IB_QPS_ERR + 1] = {
[IB_QPS_RESET] = SIW_QP_STATE_IDLE,
[IB_QPS_INIT] = SIW_QP_STATE_IDLE,
[IB_QPS_RTR] = SIW_QP_STATE_RTR,
[IB_QPS_RTS] = SIW_QP_STATE_RTS,
[IB_QPS_SQD] = SIW_QP_STATE_CLOSING,
[IB_QPS_SQE] = SIW_QP_STATE_TERMINATE,
[IB_QPS_ERR] = SIW_QP_STATE_ERROR
};
static char ib_qp_state_to_string[IB_QPS_ERR + 1][sizeof("RESET")] = {
[IB_QPS_RESET] = "RESET", [IB_QPS_INIT] = "INIT", [IB_QPS_RTR] = "RTR",
[IB_QPS_RTS] = "RTS", [IB_QPS_SQD] = "SQD", [IB_QPS_SQE] = "SQE",
[IB_QPS_ERR] = "ERR"
};
void siw_mmap_free(struct rdma_user_mmap_entry *rdma_entry)
{
struct siw_user_mmap_entry *entry = to_siw_mmap_entry(rdma_entry);
kfree(entry);
}
int siw_mmap(struct ib_ucontext *ctx, struct vm_area_struct *vma)
{
struct siw_ucontext *uctx = to_siw_ctx(ctx);
size_t size = vma->vm_end - vma->vm_start;
struct rdma_user_mmap_entry *rdma_entry;
struct siw_user_mmap_entry *entry;
int rv = -EINVAL;
/*
* Must be page aligned
*/
if (vma->vm_start & (PAGE_SIZE - 1)) {
pr_warn("siw: mmap not page aligned\n");
return -EINVAL;
}
rdma_entry = rdma_user_mmap_entry_get(&uctx->base_ucontext, vma);
if (!rdma_entry) {
siw_dbg(&uctx->sdev->base_dev, "mmap lookup failed: %lu, %#zx\n",
vma->vm_pgoff, size);
return -EINVAL;
}
entry = to_siw_mmap_entry(rdma_entry);
rv = remap_vmalloc_range(vma, entry->address, 0);
if (rv) {
pr_warn("remap_vmalloc_range failed: %lu, %zu\n", vma->vm_pgoff,
size);
goto out;
}
out:
rdma_user_mmap_entry_put(rdma_entry);
return rv;
}
int siw_alloc_ucontext(struct ib_ucontext *base_ctx, struct ib_udata *udata)
{
struct siw_device *sdev = to_siw_dev(base_ctx->device);
struct siw_ucontext *ctx = to_siw_ctx(base_ctx);
struct siw_uresp_alloc_ctx uresp = {};
int rv;
if (atomic_inc_return(&sdev->num_ctx) > SIW_MAX_CONTEXT) {
rv = -ENOMEM;
goto err_out;
}
ctx->sdev = sdev;
uresp.dev_id = sdev->vendor_part_id;
if (udata->outlen < sizeof(uresp)) {
rv = -EINVAL;
goto err_out;
}
rv = ib_copy_to_udata(udata, &uresp, sizeof(uresp));
if (rv)
goto err_out;
siw_dbg(base_ctx->device, "success. now %d context(s)\n",
atomic_read(&sdev->num_ctx));
return 0;
err_out:
atomic_dec(&sdev->num_ctx);
siw_dbg(base_ctx->device, "failure %d. now %d context(s)\n", rv,
atomic_read(&sdev->num_ctx));
return rv;
}
void siw_dealloc_ucontext(struct ib_ucontext *base_ctx)
{
struct siw_ucontext *uctx = to_siw_ctx(base_ctx);
atomic_dec(&uctx->sdev->num_ctx);
}
int siw_query_device(struct ib_device *base_dev, struct ib_device_attr *attr,
struct ib_udata *udata)
{
struct siw_device *sdev = to_siw_dev(base_dev);
if (udata->inlen || udata->outlen)
return -EINVAL;
memset(attr, 0, sizeof(*attr));
/* Revisit atomic caps if RFC 7306 gets supported */
attr->atomic_cap = 0;
attr->device_cap_flags = IB_DEVICE_MEM_MGT_EXTENSIONS;
attr->kernel_cap_flags = IBK_ALLOW_USER_UNREG;
attr->max_cq = sdev->attrs.max_cq;
attr->max_cqe = sdev->attrs.max_cqe;
attr->max_fast_reg_page_list_len = SIW_MAX_SGE_PBL;
attr->max_mr = sdev->attrs.max_mr;
attr->max_mw = sdev->attrs.max_mw;
attr->max_mr_size = ~0ull;
attr->max_pd = sdev->attrs.max_pd;
attr->max_qp = sdev->attrs.max_qp;
attr->max_qp_init_rd_atom = sdev->attrs.max_ird;
attr->max_qp_rd_atom = sdev->attrs.max_ord;
attr->max_qp_wr = sdev->attrs.max_qp_wr;
attr->max_recv_sge = sdev->attrs.max_sge;
attr->max_res_rd_atom = sdev->attrs.max_qp * sdev->attrs.max_ird;
attr->max_send_sge = sdev->attrs.max_sge;
attr->max_sge_rd = sdev->attrs.max_sge_rd;
attr->max_srq = sdev->attrs.max_srq;
attr->max_srq_sge = sdev->attrs.max_srq_sge;
attr->max_srq_wr = sdev->attrs.max_srq_wr;
attr->page_size_cap = PAGE_SIZE;
attr->vendor_id = SIW_VENDOR_ID;
attr->vendor_part_id = sdev->vendor_part_id;
addrconf_addr_eui48((u8 *)&attr->sys_image_guid,
sdev->netdev->dev_addr);
return 0;
}
int siw_query_port(struct ib_device *base_dev, u32 port,
struct ib_port_attr *attr)
{
struct siw_device *sdev = to_siw_dev(base_dev);
int rv;
memset(attr, 0, sizeof(*attr));
rv = ib_get_eth_speed(base_dev, port, &attr->active_speed,
&attr->active_width);
attr->gid_tbl_len = 1;
attr->max_msg_sz = -1;
attr->max_mtu = ib_mtu_int_to_enum(sdev->netdev->mtu);
attr->active_mtu = ib_mtu_int_to_enum(sdev->netdev->mtu);
attr->phys_state = sdev->state == IB_PORT_ACTIVE ?
IB_PORT_PHYS_STATE_LINK_UP : IB_PORT_PHYS_STATE_DISABLED;
attr->port_cap_flags = IB_PORT_CM_SUP | IB_PORT_DEVICE_MGMT_SUP;
attr->state = sdev->state;
/*
* All zero
*
* attr->lid = 0;
* attr->bad_pkey_cntr = 0;
* attr->qkey_viol_cntr = 0;
* attr->sm_lid = 0;
* attr->lmc = 0;
* attr->max_vl_num = 0;
* attr->sm_sl = 0;
* attr->subnet_timeout = 0;
* attr->init_type_repy = 0;
*/
return rv;
}
int siw_get_port_immutable(struct ib_device *base_dev, u32 port,
struct ib_port_immutable *port_immutable)
{
struct ib_port_attr attr;
int rv = siw_query_port(base_dev, port, &attr);
if (rv)
return rv;
port_immutable->gid_tbl_len = attr.gid_tbl_len;
port_immutable->core_cap_flags = RDMA_CORE_PORT_IWARP;
return 0;
}
int siw_query_gid(struct ib_device *base_dev, u32 port, int idx,
union ib_gid *gid)
{
struct siw_device *sdev = to_siw_dev(base_dev);
/* subnet_prefix == interface_id == 0; */
memset(gid, 0, sizeof(*gid));
memcpy(&gid->raw[0], sdev->netdev->dev_addr, 6);
return 0;
}
int siw_alloc_pd(struct ib_pd *pd, struct ib_udata *udata)
{
struct siw_device *sdev = to_siw_dev(pd->device);
if (atomic_inc_return(&sdev->num_pd) > SIW_MAX_PD) {
atomic_dec(&sdev->num_pd);
return -ENOMEM;
}
siw_dbg_pd(pd, "now %d PD's(s)\n", atomic_read(&sdev->num_pd));
return 0;
}
int siw_dealloc_pd(struct ib_pd *pd, struct ib_udata *udata)
{
struct siw_device *sdev = to_siw_dev(pd->device);
siw_dbg_pd(pd, "free PD\n");
atomic_dec(&sdev->num_pd);
return 0;
}
void siw_qp_get_ref(struct ib_qp *base_qp)
{
siw_qp_get(to_siw_qp(base_qp));
}
void siw_qp_put_ref(struct ib_qp *base_qp)
{
siw_qp_put(to_siw_qp(base_qp));
}
static struct rdma_user_mmap_entry *
siw_mmap_entry_insert(struct siw_ucontext *uctx,
void *address, size_t length,
u64 *offset)
{
struct siw_user_mmap_entry *entry = kzalloc(sizeof(*entry), GFP_KERNEL);
int rv;
*offset = SIW_INVAL_UOBJ_KEY;
if (!entry)
return NULL;
entry->address = address;
rv = rdma_user_mmap_entry_insert(&uctx->base_ucontext,
&entry->rdma_entry,
length);
if (rv) {
kfree(entry);
return NULL;
}
*offset = rdma_user_mmap_get_offset(&entry->rdma_entry);
return &entry->rdma_entry;
}
/*
* siw_create_qp()
*
* Create QP of requested size on given device.
*
* @qp: Queue pait
* @attrs: Initial QP attributes.
* @udata: used to provide QP ID, SQ and RQ size back to user.
*/
int siw_create_qp(struct ib_qp *ibqp, struct ib_qp_init_attr *attrs,
struct ib_udata *udata)
{
struct ib_pd *pd = ibqp->pd;
struct siw_qp *qp = to_siw_qp(ibqp);
struct ib_device *base_dev = pd->device;
struct siw_device *sdev = to_siw_dev(base_dev);
struct siw_ucontext *uctx =
rdma_udata_to_drv_context(udata, struct siw_ucontext,
base_ucontext);
unsigned long flags;
int num_sqe, num_rqe, rv = 0;
size_t length;
siw_dbg(base_dev, "create new QP\n");
if (attrs->create_flags)
return -EOPNOTSUPP;
if (atomic_inc_return(&sdev->num_qp) > SIW_MAX_QP) {
siw_dbg(base_dev, "too many QP's\n");
rv = -ENOMEM;
goto err_atomic;
}
if (attrs->qp_type != IB_QPT_RC) {
siw_dbg(base_dev, "only RC QP's supported\n");
rv = -EOPNOTSUPP;
goto err_atomic;
}
if ((attrs->cap.max_send_wr > SIW_MAX_QP_WR) ||
(attrs->cap.max_recv_wr > SIW_MAX_QP_WR) ||
(attrs->cap.max_send_sge > SIW_MAX_SGE) ||
(attrs->cap.max_recv_sge > SIW_MAX_SGE)) {
siw_dbg(base_dev, "QP size error\n");
rv = -EINVAL;
goto err_atomic;
}
if (attrs->cap.max_inline_data > SIW_MAX_INLINE) {
siw_dbg(base_dev, "max inline send: %d > %d\n",
attrs->cap.max_inline_data, (int)SIW_MAX_INLINE);
rv = -EINVAL;
goto err_atomic;
}
/*
* NOTE: we allow for zero element SQ and RQ WQE's SGL's
* but not for a QP unable to hold any WQE (SQ + RQ)
*/
if (attrs->cap.max_send_wr + attrs->cap.max_recv_wr == 0) {
siw_dbg(base_dev, "QP must have send or receive queue\n");
rv = -EINVAL;
goto err_atomic;
}
if (!attrs->send_cq || (!attrs->recv_cq && !attrs->srq)) {
siw_dbg(base_dev, "send CQ or receive CQ invalid\n");
rv = -EINVAL;
goto err_atomic;
}
init_rwsem(&qp->state_lock);
spin_lock_init(&qp->sq_lock);
spin_lock_init(&qp->rq_lock);
spin_lock_init(&qp->orq_lock);
rv = siw_qp_add(sdev, qp);
if (rv)
goto err_atomic;
num_sqe = attrs->cap.max_send_wr;
num_rqe = attrs->cap.max_recv_wr;
/* All queue indices are derived from modulo operations
* on a free running 'get' (consumer) and 'put' (producer)
* unsigned counter. Having queue sizes at power of two
* avoids handling counter wrap around.
*/
if (num_sqe)
num_sqe = roundup_pow_of_two(num_sqe);
else {
/* Zero sized SQ is not supported */
rv = -EINVAL;
goto err_out_xa;
}
if (num_rqe)
num_rqe = roundup_pow_of_two(num_rqe);
if (udata)
qp->sendq = vmalloc_user(num_sqe * sizeof(struct siw_sqe));
else
qp->sendq = vzalloc(num_sqe * sizeof(struct siw_sqe));
if (qp->sendq == NULL) {
rv = -ENOMEM;
goto err_out_xa;
}
if (attrs->sq_sig_type != IB_SIGNAL_REQ_WR) {
if (attrs->sq_sig_type == IB_SIGNAL_ALL_WR)
qp->attrs.flags |= SIW_SIGNAL_ALL_WR;
else {
rv = -EINVAL;
goto err_out_xa;
}
}
qp->pd = pd;
qp->scq = to_siw_cq(attrs->send_cq);
qp->rcq = to_siw_cq(attrs->recv_cq);
if (attrs->srq) {
/*
* SRQ support.
* Verbs 6.3.7: ignore RQ size, if SRQ present
* Verbs 6.3.5: do not check PD of SRQ against PD of QP
*/
qp->srq = to_siw_srq(attrs->srq);
qp->attrs.rq_size = 0;
siw_dbg(base_dev, "QP [%u]: SRQ attached\n",
qp->base_qp.qp_num);
} else if (num_rqe) {
if (udata)
qp->recvq =
vmalloc_user(num_rqe * sizeof(struct siw_rqe));
else
qp->recvq = vzalloc(num_rqe * sizeof(struct siw_rqe));
if (qp->recvq == NULL) {
rv = -ENOMEM;
goto err_out_xa;
}
qp->attrs.rq_size = num_rqe;
}
qp->attrs.sq_size = num_sqe;
qp->attrs.sq_max_sges = attrs->cap.max_send_sge;
qp->attrs.rq_max_sges = attrs->cap.max_recv_sge;
/* Make those two tunables fixed for now. */
qp->tx_ctx.gso_seg_limit = 1;
qp->tx_ctx.zcopy_tx = zcopy_tx;
qp->attrs.state = SIW_QP_STATE_IDLE;
if (udata) {
struct siw_uresp_create_qp uresp = {};
uresp.num_sqe = num_sqe;
uresp.num_rqe = num_rqe;
uresp.qp_id = qp_id(qp);
if (qp->sendq) {
length = num_sqe * sizeof(struct siw_sqe);
qp->sq_entry =
siw_mmap_entry_insert(uctx, qp->sendq,
length, &uresp.sq_key);
if (!qp->sq_entry) {
rv = -ENOMEM;
goto err_out_xa;
}
}
if (qp->recvq) {
length = num_rqe * sizeof(struct siw_rqe);
qp->rq_entry =
siw_mmap_entry_insert(uctx, qp->recvq,
length, &uresp.rq_key);
if (!qp->rq_entry) {
uresp.sq_key = SIW_INVAL_UOBJ_KEY;
rv = -ENOMEM;
goto err_out_xa;
}
}
if (udata->outlen < sizeof(uresp)) {
rv = -EINVAL;
goto err_out_xa;
}
rv = ib_copy_to_udata(udata, &uresp, sizeof(uresp));
if (rv)
goto err_out_xa;
}
qp->tx_cpu = siw_get_tx_cpu(sdev);
if (qp->tx_cpu < 0) {
rv = -EINVAL;
goto err_out_xa;
}
INIT_LIST_HEAD(&qp->devq);
spin_lock_irqsave(&sdev->lock, flags);
list_add_tail(&qp->devq, &sdev->qp_list);
spin_unlock_irqrestore(&sdev->lock, flags);
init_completion(&qp->qp_free);
return 0;
err_out_xa:
xa_erase(&sdev->qp_xa, qp_id(qp));
if (uctx) {
rdma_user_mmap_entry_remove(qp->sq_entry);
rdma_user_mmap_entry_remove(qp->rq_entry);
}
vfree(qp->sendq);
vfree(qp->recvq);
err_atomic:
atomic_dec(&sdev->num_qp);
return rv;
}
/*
* Minimum siw_query_qp() verb interface.
*
* @qp_attr_mask is not used but all available information is provided
*/
int siw_query_qp(struct ib_qp *base_qp, struct ib_qp_attr *qp_attr,
int qp_attr_mask, struct ib_qp_init_attr *qp_init_attr)
{
struct siw_qp *qp;
struct siw_device *sdev;
if (base_qp && qp_attr && qp_init_attr) {
qp = to_siw_qp(base_qp);
sdev = to_siw_dev(base_qp->device);
} else {
return -EINVAL;
}
qp_attr->cap.max_inline_data = SIW_MAX_INLINE;
qp_attr->cap.max_send_wr = qp->attrs.sq_size;
qp_attr->cap.max_send_sge = qp->attrs.sq_max_sges;
qp_attr->cap.max_recv_wr = qp->attrs.rq_size;
qp_attr->cap.max_recv_sge = qp->attrs.rq_max_sges;
qp_attr->path_mtu = ib_mtu_int_to_enum(sdev->netdev->mtu);
qp_attr->max_rd_atomic = qp->attrs.irq_size;
qp_attr->max_dest_rd_atomic = qp->attrs.orq_size;
qp_attr->qp_access_flags = IB_ACCESS_LOCAL_WRITE |
IB_ACCESS_REMOTE_WRITE |
IB_ACCESS_REMOTE_READ;
qp_init_attr->qp_type = base_qp->qp_type;
qp_init_attr->send_cq = base_qp->send_cq;
qp_init_attr->recv_cq = base_qp->recv_cq;
qp_init_attr->srq = base_qp->srq;
qp_init_attr->cap = qp_attr->cap;
return 0;
}
int siw_verbs_modify_qp(struct ib_qp *base_qp, struct ib_qp_attr *attr,
int attr_mask, struct ib_udata *udata)
{
struct siw_qp_attrs new_attrs;
enum siw_qp_attr_mask siw_attr_mask = 0;
struct siw_qp *qp = to_siw_qp(base_qp);
int rv = 0;
if (!attr_mask)
return 0;
if (attr_mask & ~IB_QP_ATTR_STANDARD_BITS)
return -EOPNOTSUPP;
memset(&new_attrs, 0, sizeof(new_attrs));
if (attr_mask & IB_QP_ACCESS_FLAGS) {
siw_attr_mask = SIW_QP_ATTR_ACCESS_FLAGS;
if (attr->qp_access_flags & IB_ACCESS_REMOTE_READ)
new_attrs.flags |= SIW_RDMA_READ_ENABLED;
if (attr->qp_access_flags & IB_ACCESS_REMOTE_WRITE)
new_attrs.flags |= SIW_RDMA_WRITE_ENABLED;
if (attr->qp_access_flags & IB_ACCESS_MW_BIND)
new_attrs.flags |= SIW_RDMA_BIND_ENABLED;
}
if (attr_mask & IB_QP_STATE) {
siw_dbg_qp(qp, "desired IB QP state: %s\n",
ib_qp_state_to_string[attr->qp_state]);
new_attrs.state = ib_qp_state_to_siw_qp_state[attr->qp_state];
if (new_attrs.state > SIW_QP_STATE_RTS)
qp->tx_ctx.tx_suspend = 1;
siw_attr_mask |= SIW_QP_ATTR_STATE;
}
if (!siw_attr_mask)
goto out;
down_write(&qp->state_lock);
rv = siw_qp_modify(qp, &new_attrs, siw_attr_mask);
up_write(&qp->state_lock);
out:
return rv;
}
int siw_destroy_qp(struct ib_qp *base_qp, struct ib_udata *udata)
{
struct siw_qp *qp = to_siw_qp(base_qp);
struct siw_ucontext *uctx =
rdma_udata_to_drv_context(udata, struct siw_ucontext,
base_ucontext);
struct siw_qp_attrs qp_attrs;
siw_dbg_qp(qp, "state %d\n", qp->attrs.state);
/*
* Mark QP as in process of destruction to prevent from
* any async callbacks to RDMA core
*/
qp->attrs.flags |= SIW_QP_IN_DESTROY;
qp->rx_stream.rx_suspend = 1;
if (uctx) {
rdma_user_mmap_entry_remove(qp->sq_entry);
rdma_user_mmap_entry_remove(qp->rq_entry);
}
down_write(&qp->state_lock);
qp_attrs.state = SIW_QP_STATE_ERROR;
siw_qp_modify(qp, &qp_attrs, SIW_QP_ATTR_STATE);
if (qp->cep) {
siw_cep_put(qp->cep);
qp->cep = NULL;
}
up_write(&qp->state_lock);
kfree(qp->tx_ctx.mpa_crc_hd);
kfree(qp->rx_stream.mpa_crc_hd);
qp->scq = qp->rcq = NULL;
siw_qp_put(qp);
wait_for_completion(&qp->qp_free);
return 0;
}
/*
* siw_copy_inline_sgl()
*
* Prepare sgl of inlined data for sending. For userland callers
* function checks if given buffer addresses and len's are within
* process context bounds.
* Data from all provided sge's are copied together into the wqe,
* referenced by a single sge.
*/
static int siw_copy_inline_sgl(const struct ib_send_wr *core_wr,
struct siw_sqe *sqe)
{
struct ib_sge *core_sge = core_wr->sg_list;
void *kbuf = &sqe->sge[1];
int num_sge = core_wr->num_sge, bytes = 0;
sqe->sge[0].laddr = (uintptr_t)kbuf;
sqe->sge[0].lkey = 0;
while (num_sge--) {
if (!core_sge->length) {
core_sge++;
continue;
}
bytes += core_sge->length;
if (bytes > SIW_MAX_INLINE) {
bytes = -EINVAL;
break;
}
memcpy(kbuf, (void *)(uintptr_t)core_sge->addr,
core_sge->length);
kbuf += core_sge->length;
core_sge++;
}
sqe->sge[0].length = max(bytes, 0);
sqe->num_sge = bytes > 0 ? 1 : 0;
return bytes;
}
/* Complete SQ WR's without processing */
static int siw_sq_flush_wr(struct siw_qp *qp, const struct ib_send_wr *wr,
const struct ib_send_wr **bad_wr)
{
int rv = 0;
while (wr) {
struct siw_sqe sqe = {};
switch (wr->opcode) {
case IB_WR_RDMA_WRITE:
sqe.opcode = SIW_OP_WRITE;
break;
case IB_WR_RDMA_READ:
sqe.opcode = SIW_OP_READ;
break;
case IB_WR_RDMA_READ_WITH_INV:
sqe.opcode = SIW_OP_READ_LOCAL_INV;
break;
case IB_WR_SEND:
sqe.opcode = SIW_OP_SEND;
break;
case IB_WR_SEND_WITH_IMM:
sqe.opcode = SIW_OP_SEND_WITH_IMM;
break;
case IB_WR_SEND_WITH_INV:
sqe.opcode = SIW_OP_SEND_REMOTE_INV;
break;
case IB_WR_LOCAL_INV:
sqe.opcode = SIW_OP_INVAL_STAG;
break;
case IB_WR_REG_MR:
sqe.opcode = SIW_OP_REG_MR;
break;
default:
rv = -EINVAL;
break;
}
if (!rv) {
sqe.id = wr->wr_id;
rv = siw_sqe_complete(qp, &sqe, 0,
SIW_WC_WR_FLUSH_ERR);
}
if (rv) {
if (bad_wr)
*bad_wr = wr;
break;
}
wr = wr->next;
}
return rv;
}
/* Complete RQ WR's without processing */
static int siw_rq_flush_wr(struct siw_qp *qp, const struct ib_recv_wr *wr,
const struct ib_recv_wr **bad_wr)
{
struct siw_rqe rqe = {};
int rv = 0;
while (wr) {
rqe.id = wr->wr_id;
rv = siw_rqe_complete(qp, &rqe, 0, 0, SIW_WC_WR_FLUSH_ERR);
if (rv) {
if (bad_wr)
*bad_wr = wr;
break;
}
wr = wr->next;
}
return rv;
}
/*
* siw_post_send()
*
* Post a list of S-WR's to a SQ.
*
* @base_qp: Base QP contained in siw QP
* @wr: Null terminated list of user WR's
* @bad_wr: Points to failing WR in case of synchronous failure.
*/
int siw_post_send(struct ib_qp *base_qp, const struct ib_send_wr *wr,
const struct ib_send_wr **bad_wr)
{
struct siw_qp *qp = to_siw_qp(base_qp);
struct siw_wqe *wqe = tx_wqe(qp);
unsigned long flags;
int rv = 0;
if (wr && !rdma_is_kernel_res(&qp->base_qp.res)) {
siw_dbg_qp(qp, "wr must be empty for user mapped sq\n");
*bad_wr = wr;
return -EINVAL;
}
/*
* Try to acquire QP state lock. Must be non-blocking
* to accommodate kernel clients needs.
*/
if (!down_read_trylock(&qp->state_lock)) {
if (qp->attrs.state == SIW_QP_STATE_ERROR) {
/*
* ERROR state is final, so we can be sure
* this state will not change as long as the QP
* exists.
*
* This handles an ib_drain_sq() call with
* a concurrent request to set the QP state
* to ERROR.
*/
rv = siw_sq_flush_wr(qp, wr, bad_wr);
} else {
siw_dbg_qp(qp, "QP locked, state %d\n",
qp->attrs.state);
*bad_wr = wr;
rv = -ENOTCONN;
}
return rv;
}
if (unlikely(qp->attrs.state != SIW_QP_STATE_RTS)) {
if (qp->attrs.state == SIW_QP_STATE_ERROR) {
/*
* Immediately flush this WR to CQ, if QP
* is in ERROR state. SQ is guaranteed to
* be empty, so WR complets in-order.
*
* Typically triggered by ib_drain_sq().
*/
rv = siw_sq_flush_wr(qp, wr, bad_wr);
} else {
siw_dbg_qp(qp, "QP out of state %d\n",
qp->attrs.state);
*bad_wr = wr;
rv = -ENOTCONN;
}
up_read(&qp->state_lock);
return rv;
}
spin_lock_irqsave(&qp->sq_lock, flags);
while (wr) {
u32 idx = qp->sq_put % qp->attrs.sq_size;
struct siw_sqe *sqe = &qp->sendq[idx];
if (sqe->flags) {
siw_dbg_qp(qp, "sq full\n");
rv = -ENOMEM;
break;
}
if (wr->num_sge > qp->attrs.sq_max_sges) {
siw_dbg_qp(qp, "too many sge's: %d\n", wr->num_sge);
rv = -EINVAL;
break;
}
sqe->id = wr->wr_id;
if ((wr->send_flags & IB_SEND_SIGNALED) ||
(qp->attrs.flags & SIW_SIGNAL_ALL_WR))
sqe->flags |= SIW_WQE_SIGNALLED;
if (wr->send_flags & IB_SEND_FENCE)
sqe->flags |= SIW_WQE_READ_FENCE;
switch (wr->opcode) {
case IB_WR_SEND:
case IB_WR_SEND_WITH_INV:
if (wr->send_flags & IB_SEND_SOLICITED)
sqe->flags |= SIW_WQE_SOLICITED;
if (!(wr->send_flags & IB_SEND_INLINE)) {
siw_copy_sgl(wr->sg_list, sqe->sge,
wr->num_sge);
sqe->num_sge = wr->num_sge;
} else {
rv = siw_copy_inline_sgl(wr, sqe);
if (rv <= 0) {
rv = -EINVAL;
break;
}
sqe->flags |= SIW_WQE_INLINE;
sqe->num_sge = 1;
}
if (wr->opcode == IB_WR_SEND)
sqe->opcode = SIW_OP_SEND;
else {
sqe->opcode = SIW_OP_SEND_REMOTE_INV;
sqe->rkey = wr->ex.invalidate_rkey;
}
break;
case IB_WR_RDMA_READ_WITH_INV:
case IB_WR_RDMA_READ:
/*
* iWarp restricts RREAD sink to SGL containing
* 1 SGE only. we could relax to SGL with multiple
* elements referring the SAME ltag or even sending
* a private per-rreq tag referring to a checked
* local sgl with MULTIPLE ltag's.
*/
if (unlikely(wr->num_sge != 1)) {
rv = -EINVAL;
break;
}
siw_copy_sgl(wr->sg_list, &sqe->sge[0], 1);
/*
* NOTE: zero length RREAD is allowed!
*/
sqe->raddr = rdma_wr(wr)->remote_addr;
sqe->rkey = rdma_wr(wr)->rkey;
sqe->num_sge = 1;
if (wr->opcode == IB_WR_RDMA_READ)
sqe->opcode = SIW_OP_READ;
else
sqe->opcode = SIW_OP_READ_LOCAL_INV;
break;
case IB_WR_RDMA_WRITE:
if (!(wr->send_flags & IB_SEND_INLINE)) {
siw_copy_sgl(wr->sg_list, &sqe->sge[0],
wr->num_sge);
sqe->num_sge = wr->num_sge;
} else {
rv = siw_copy_inline_sgl(wr, sqe);
if (unlikely(rv < 0)) {
rv = -EINVAL;
break;
}
sqe->flags |= SIW_WQE_INLINE;
sqe->num_sge = 1;
}
sqe->raddr = rdma_wr(wr)->remote_addr;
sqe->rkey = rdma_wr(wr)->rkey;
sqe->opcode = SIW_OP_WRITE;
break;
case IB_WR_REG_MR:
sqe->base_mr = (uintptr_t)reg_wr(wr)->mr;
sqe->rkey = reg_wr(wr)->key;
sqe->access = reg_wr(wr)->access & IWARP_ACCESS_MASK;
sqe->opcode = SIW_OP_REG_MR;
break;
case IB_WR_LOCAL_INV:
sqe->rkey = wr->ex.invalidate_rkey;
sqe->opcode = SIW_OP_INVAL_STAG;
break;
default:
siw_dbg_qp(qp, "ib wr type %d unsupported\n",
wr->opcode);
rv = -EINVAL;
break;
}
siw_dbg_qp(qp, "opcode %d, flags 0x%x, wr_id 0x%pK\n",
sqe->opcode, sqe->flags,
(void *)(uintptr_t)sqe->id);
if (unlikely(rv < 0))
break;
/* make SQE only valid after completely written */
smp_wmb();
sqe->flags |= SIW_WQE_VALID;
qp->sq_put++;
wr = wr->next;
}
/*
* Send directly if SQ processing is not in progress.
* Eventual immediate errors (rv < 0) do not affect the involved
* RI resources (Verbs, 8.3.1) and thus do not prevent from SQ
* processing, if new work is already pending. But rv must be passed
* to caller.
*/
if (wqe->wr_status != SIW_WR_IDLE) {
spin_unlock_irqrestore(&qp->sq_lock, flags);
goto skip_direct_sending;
}
rv = siw_activate_tx(qp);
spin_unlock_irqrestore(&qp->sq_lock, flags);
if (rv <= 0)
goto skip_direct_sending;
if (rdma_is_kernel_res(&qp->base_qp.res)) {
rv = siw_sq_start(qp);
} else {
qp->tx_ctx.in_syscall = 1;
if (siw_qp_sq_process(qp) != 0 && !(qp->tx_ctx.tx_suspend))
siw_qp_cm_drop(qp, 0);
qp->tx_ctx.in_syscall = 0;
}
skip_direct_sending:
up_read(&qp->state_lock);
if (rv >= 0)
return 0;
/*
* Immediate error
*/
siw_dbg_qp(qp, "error %d\n", rv);
*bad_wr = wr;
return rv;
}
/*
* siw_post_receive()
*
* Post a list of R-WR's to a RQ.
*
* @base_qp: Base QP contained in siw QP
* @wr: Null terminated list of user WR's
* @bad_wr: Points to failing WR in case of synchronous failure.
*/
int siw_post_receive(struct ib_qp *base_qp, const struct ib_recv_wr *wr,
const struct ib_recv_wr **bad_wr)
{
struct siw_qp *qp = to_siw_qp(base_qp);
unsigned long flags;
int rv = 0;
if (qp->srq || qp->attrs.rq_size == 0) {
*bad_wr = wr;
return -EINVAL;
}
if (!rdma_is_kernel_res(&qp->base_qp.res)) {
siw_dbg_qp(qp, "no kernel post_recv for user mapped rq\n");
*bad_wr = wr;
return -EINVAL;
}
/*
* Try to acquire QP state lock. Must be non-blocking
* to accommodate kernel clients needs.
*/
if (!down_read_trylock(&qp->state_lock)) {
if (qp->attrs.state == SIW_QP_STATE_ERROR) {
/*
* ERROR state is final, so we can be sure
* this state will not change as long as the QP
* exists.
*
* This handles an ib_drain_rq() call with
* a concurrent request to set the QP state
* to ERROR.
*/
rv = siw_rq_flush_wr(qp, wr, bad_wr);
} else {
siw_dbg_qp(qp, "QP locked, state %d\n",
qp->attrs.state);
*bad_wr = wr;
rv = -ENOTCONN;
}
return rv;
}
if (qp->attrs.state > SIW_QP_STATE_RTS) {
if (qp->attrs.state == SIW_QP_STATE_ERROR) {
/*
* Immediately flush this WR to CQ, if QP
* is in ERROR state. RQ is guaranteed to
* be empty, so WR complets in-order.
*
* Typically triggered by ib_drain_rq().
*/
rv = siw_rq_flush_wr(qp, wr, bad_wr);
} else {
siw_dbg_qp(qp, "QP out of state %d\n",
qp->attrs.state);
*bad_wr = wr;
rv = -ENOTCONN;
}
up_read(&qp->state_lock);
return rv;
}
/*
* Serialize potentially multiple producers.
* Not needed for single threaded consumer side.
*/
spin_lock_irqsave(&qp->rq_lock, flags);
while (wr) {
u32 idx = qp->rq_put % qp->attrs.rq_size;
struct siw_rqe *rqe = &qp->recvq[idx];
if (rqe->flags) {
siw_dbg_qp(qp, "RQ full\n");
rv = -ENOMEM;
break;
}
if (wr->num_sge > qp->attrs.rq_max_sges) {
siw_dbg_qp(qp, "too many sge's: %d\n", wr->num_sge);
rv = -EINVAL;
break;
}
rqe->id = wr->wr_id;
rqe->num_sge = wr->num_sge;
siw_copy_sgl(wr->sg_list, rqe->sge, wr->num_sge);
/* make sure RQE is completely written before valid */
smp_wmb();
rqe->flags = SIW_WQE_VALID;
qp->rq_put++;
wr = wr->next;
}
spin_unlock_irqrestore(&qp->rq_lock, flags);
up_read(&qp->state_lock);
if (rv < 0) {
siw_dbg_qp(qp, "error %d\n", rv);
*bad_wr = wr;
}
return rv > 0 ? 0 : rv;
}
int siw_destroy_cq(struct ib_cq *base_cq, struct ib_udata *udata)
{
struct siw_cq *cq = to_siw_cq(base_cq);
struct siw_device *sdev = to_siw_dev(base_cq->device);
struct siw_ucontext *ctx =
rdma_udata_to_drv_context(udata, struct siw_ucontext,
base_ucontext);
siw_dbg_cq(cq, "free CQ resources\n");
siw_cq_flush(cq);
if (ctx)
rdma_user_mmap_entry_remove(cq->cq_entry);
atomic_dec(&sdev->num_cq);
vfree(cq->queue);
return 0;
}
/*
* siw_create_cq()
*
* Populate CQ of requested size
*
* @base_cq: CQ as allocated by RDMA midlayer
* @attr: Initial CQ attributes
* @udata: relates to user context
*/
int siw_create_cq(struct ib_cq *base_cq, const struct ib_cq_init_attr *attr,
struct ib_udata *udata)
{
struct siw_device *sdev = to_siw_dev(base_cq->device);
struct siw_cq *cq = to_siw_cq(base_cq);
int rv, size = attr->cqe;
if (attr->flags)
return -EOPNOTSUPP;
if (atomic_inc_return(&sdev->num_cq) > SIW_MAX_CQ) {
siw_dbg(base_cq->device, "too many CQ's\n");
rv = -ENOMEM;
goto err_out;
}
if (size < 1 || size > sdev->attrs.max_cqe) {
siw_dbg(base_cq->device, "CQ size error: %d\n", size);
rv = -EINVAL;
goto err_out;
}
size = roundup_pow_of_two(size);
cq->base_cq.cqe = size;
cq->num_cqe = size;
if (udata)
cq->queue = vmalloc_user(size * sizeof(struct siw_cqe) +
sizeof(struct siw_cq_ctrl));
else
cq->queue = vzalloc(size * sizeof(struct siw_cqe) +
sizeof(struct siw_cq_ctrl));
if (cq->queue == NULL) {
rv = -ENOMEM;
goto err_out;
}
get_random_bytes(&cq->id, 4);
siw_dbg(base_cq->device, "new CQ [%u]\n", cq->id);
spin_lock_init(&cq->lock);
cq->notify = (struct siw_cq_ctrl *)&cq->queue[size];
if (udata) {
struct siw_uresp_create_cq uresp = {};
struct siw_ucontext *ctx =
rdma_udata_to_drv_context(udata, struct siw_ucontext,
base_ucontext);
size_t length = size * sizeof(struct siw_cqe) +
sizeof(struct siw_cq_ctrl);
cq->cq_entry =
siw_mmap_entry_insert(ctx, cq->queue,
length, &uresp.cq_key);
if (!cq->cq_entry) {
rv = -ENOMEM;
goto err_out;
}
uresp.cq_id = cq->id;
uresp.num_cqe = size;
if (udata->outlen < sizeof(uresp)) {
rv = -EINVAL;
goto err_out;
}
rv = ib_copy_to_udata(udata, &uresp, sizeof(uresp));
if (rv)
goto err_out;
}
return 0;
err_out:
siw_dbg(base_cq->device, "CQ creation failed: %d", rv);
if (cq->queue) {
struct siw_ucontext *ctx =
rdma_udata_to_drv_context(udata, struct siw_ucontext,
base_ucontext);
if (ctx)
rdma_user_mmap_entry_remove(cq->cq_entry);
vfree(cq->queue);
}
atomic_dec(&sdev->num_cq);
return rv;
}
/*
* siw_poll_cq()
*
* Reap CQ entries if available and copy work completion status into
* array of WC's provided by caller. Returns number of reaped CQE's.
*
* @base_cq: Base CQ contained in siw CQ.
* @num_cqe: Maximum number of CQE's to reap.
* @wc: Array of work completions to be filled by siw.
*/
int siw_poll_cq(struct ib_cq *base_cq, int num_cqe, struct ib_wc *wc)
{
struct siw_cq *cq = to_siw_cq(base_cq);
int i;
for (i = 0; i < num_cqe; i++) {
if (!siw_reap_cqe(cq, wc))
break;
wc++;
}
return i;
}
/*
* siw_req_notify_cq()
*
* Request notification for new CQE's added to that CQ.
* Defined flags:
* o SIW_CQ_NOTIFY_SOLICITED lets siw trigger a notification
* event if a WQE with notification flag set enters the CQ
* o SIW_CQ_NOTIFY_NEXT_COMP lets siw trigger a notification
* event if a WQE enters the CQ.
* o IB_CQ_REPORT_MISSED_EVENTS: return value will provide the
* number of not reaped CQE's regardless of its notification
* type and current or new CQ notification settings.
*
* @base_cq: Base CQ contained in siw CQ.
* @flags: Requested notification flags.
*/
int siw_req_notify_cq(struct ib_cq *base_cq, enum ib_cq_notify_flags flags)
{
struct siw_cq *cq = to_siw_cq(base_cq);
siw_dbg_cq(cq, "flags: 0x%02x\n", flags);
if ((flags & IB_CQ_SOLICITED_MASK) == IB_CQ_SOLICITED)
/*
* Enable CQ event for next solicited completion.
* and make it visible to all associated producers.
*/
smp_store_mb(cq->notify->flags, SIW_NOTIFY_SOLICITED);
else
/*
* Enable CQ event for any signalled completion.
* and make it visible to all associated producers.
*/
smp_store_mb(cq->notify->flags, SIW_NOTIFY_ALL);
if (flags & IB_CQ_REPORT_MISSED_EVENTS)
return cq->cq_put - cq->cq_get;
return 0;
}
/*
* siw_dereg_mr()
*
* Release Memory Region.
*
* @base_mr: Base MR contained in siw MR.
* @udata: points to user context, unused.
*/
int siw_dereg_mr(struct ib_mr *base_mr, struct ib_udata *udata)
{
struct siw_mr *mr = to_siw_mr(base_mr);
struct siw_device *sdev = to_siw_dev(base_mr->device);
siw_dbg_mem(mr->mem, "deregister MR\n");
atomic_dec(&sdev->num_mr);
siw_mr_drop_mem(mr);
kfree_rcu(mr, rcu);
return 0;
}
/*
* siw_reg_user_mr()
*
* Register Memory Region.
*
* @pd: Protection Domain
* @start: starting address of MR (virtual address)
* @len: len of MR
* @rnic_va: not used by siw
* @rights: MR access rights
* @udata: user buffer to communicate STag and Key.
*/
struct ib_mr *siw_reg_user_mr(struct ib_pd *pd, u64 start, u64 len,
u64 rnic_va, int rights, struct ib_udata *udata)
{
struct siw_mr *mr = NULL;
struct siw_umem *umem = NULL;
struct siw_ureq_reg_mr ureq;
struct siw_device *sdev = to_siw_dev(pd->device);
unsigned long mem_limit = rlimit(RLIMIT_MEMLOCK);
int rv;
siw_dbg_pd(pd, "start: 0x%pK, va: 0x%pK, len: %llu\n",
(void *)(uintptr_t)start, (void *)(uintptr_t)rnic_va,
(unsigned long long)len);
if (atomic_inc_return(&sdev->num_mr) > SIW_MAX_MR) {
siw_dbg_pd(pd, "too many mr's\n");
rv = -ENOMEM;
goto err_out;
}
if (!len) {
rv = -EINVAL;
goto err_out;
}
if (mem_limit != RLIM_INFINITY) {
unsigned long num_pages =
(PAGE_ALIGN(len + (start & ~PAGE_MASK))) >> PAGE_SHIFT;
mem_limit >>= PAGE_SHIFT;
if (num_pages > mem_limit - current->mm->locked_vm) {
siw_dbg_pd(pd, "pages req %lu, max %lu, lock %lu\n",
num_pages, mem_limit,
current->mm->locked_vm);
rv = -ENOMEM;
goto err_out;
}
}
umem = siw_umem_get(start, len, ib_access_writable(rights));
if (IS_ERR(umem)) {
rv = PTR_ERR(umem);
siw_dbg_pd(pd, "getting user memory failed: %d\n", rv);
umem = NULL;
goto err_out;
}
mr = kzalloc(sizeof(*mr), GFP_KERNEL);
if (!mr) {
rv = -ENOMEM;
goto err_out;
}
rv = siw_mr_add_mem(mr, pd, umem, start, len, rights);
if (rv)
goto err_out;
if (udata) {
struct siw_uresp_reg_mr uresp = {};
struct siw_mem *mem = mr->mem;
if (udata->inlen < sizeof(ureq)) {
rv = -EINVAL;
goto err_out;
}
rv = ib_copy_from_udata(&ureq, udata, sizeof(ureq));
if (rv)
goto err_out;
mr->base_mr.lkey |= ureq.stag_key;
mr->base_mr.rkey |= ureq.stag_key;
mem->stag |= ureq.stag_key;
uresp.stag = mem->stag;
if (udata->outlen < sizeof(uresp)) {
rv = -EINVAL;
goto err_out;
}
rv = ib_copy_to_udata(udata, &uresp, sizeof(uresp));
if (rv)
goto err_out;
}
mr->mem->stag_valid = 1;
return &mr->base_mr;
err_out:
atomic_dec(&sdev->num_mr);
if (mr) {
if (mr->mem)
siw_mr_drop_mem(mr);
kfree_rcu(mr, rcu);
} else {
if (umem)
siw_umem_release(umem, false);
}
return ERR_PTR(rv);
}
struct ib_mr *siw_alloc_mr(struct ib_pd *pd, enum ib_mr_type mr_type,
u32 max_sge)
{
struct siw_device *sdev = to_siw_dev(pd->device);
struct siw_mr *mr = NULL;
struct siw_pbl *pbl = NULL;
int rv;
if (atomic_inc_return(&sdev->num_mr) > SIW_MAX_MR) {
siw_dbg_pd(pd, "too many mr's\n");
rv = -ENOMEM;
goto err_out;
}
if (mr_type != IB_MR_TYPE_MEM_REG) {
siw_dbg_pd(pd, "mr type %d unsupported\n", mr_type);
rv = -EOPNOTSUPP;
goto err_out;
}
if (max_sge > SIW_MAX_SGE_PBL) {
siw_dbg_pd(pd, "too many sge's: %d\n", max_sge);
rv = -ENOMEM;
goto err_out;
}
pbl = siw_pbl_alloc(max_sge);
if (IS_ERR(pbl)) {
rv = PTR_ERR(pbl);
siw_dbg_pd(pd, "pbl allocation failed: %d\n", rv);
pbl = NULL;
goto err_out;
}
mr = kzalloc(sizeof(*mr), GFP_KERNEL);
if (!mr) {
rv = -ENOMEM;
goto err_out;
}
rv = siw_mr_add_mem(mr, pd, pbl, 0, max_sge * PAGE_SIZE, 0);
if (rv)
goto err_out;
mr->mem->is_pbl = 1;
siw_dbg_pd(pd, "[MEM %u]: success\n", mr->mem->stag);
return &mr->base_mr;
err_out:
atomic_dec(&sdev->num_mr);
if (!mr) {
kfree(pbl);
} else {
if (mr->mem)
siw_mr_drop_mem(mr);
kfree_rcu(mr, rcu);
}
siw_dbg_pd(pd, "failed: %d\n", rv);
return ERR_PTR(rv);
}
/* Just used to count number of pages being mapped */
static int siw_set_pbl_page(struct ib_mr *base_mr, u64 buf_addr)
{
return 0;
}
int siw_map_mr_sg(struct ib_mr *base_mr, struct scatterlist *sl, int num_sle,
unsigned int *sg_off)
{
struct scatterlist *slp;
struct siw_mr *mr = to_siw_mr(base_mr);
struct siw_mem *mem = mr->mem;
struct siw_pbl *pbl = mem->pbl;
struct siw_pble *pble;
unsigned long pbl_size;
int i, rv;
if (!pbl) {
siw_dbg_mem(mem, "no PBL allocated\n");
return -EINVAL;
}
pble = pbl->pbe;
if (pbl->max_buf < num_sle) {
siw_dbg_mem(mem, "too many SGE's: %d > %d\n",
mem->pbl->max_buf, num_sle);
return -ENOMEM;
}
for_each_sg(sl, slp, num_sle, i) {
if (sg_dma_len(slp) == 0) {
siw_dbg_mem(mem, "empty SGE\n");
return -EINVAL;
}
if (i == 0) {
pble->addr = sg_dma_address(slp);
pble->size = sg_dma_len(slp);
pble->pbl_off = 0;
pbl_size = pble->size;
pbl->num_buf = 1;
} else {
/* Merge PBL entries if adjacent */
if (pble->addr + pble->size == sg_dma_address(slp)) {
pble->size += sg_dma_len(slp);
} else {
pble++;
pbl->num_buf++;
pble->addr = sg_dma_address(slp);
pble->size = sg_dma_len(slp);
pble->pbl_off = pbl_size;
}
pbl_size += sg_dma_len(slp);
}
siw_dbg_mem(mem,
"sge[%d], size %u, addr 0x%p, total %lu\n",
i, pble->size, (void *)(uintptr_t)pble->addr,
pbl_size);
}
rv = ib_sg_to_pages(base_mr, sl, num_sle, sg_off, siw_set_pbl_page);
if (rv > 0) {
mem->len = base_mr->length;
mem->va = base_mr->iova;
siw_dbg_mem(mem,
"%llu bytes, start 0x%pK, %u SLE to %u entries\n",
mem->len, (void *)(uintptr_t)mem->va, num_sle,
pbl->num_buf);
}
return rv;
}
/*
* siw_get_dma_mr()
*
* Create a (empty) DMA memory region, where no umem is attached.
*/
struct ib_mr *siw_get_dma_mr(struct ib_pd *pd, int rights)
{
struct siw_device *sdev = to_siw_dev(pd->device);
struct siw_mr *mr = NULL;
int rv;
if (atomic_inc_return(&sdev->num_mr) > SIW_MAX_MR) {
siw_dbg_pd(pd, "too many mr's\n");
rv = -ENOMEM;
goto err_out;
}
mr = kzalloc(sizeof(*mr), GFP_KERNEL);
if (!mr) {
rv = -ENOMEM;
goto err_out;
}
rv = siw_mr_add_mem(mr, pd, NULL, 0, ULONG_MAX, rights);
if (rv)
goto err_out;
mr->mem->stag_valid = 1;
siw_dbg_pd(pd, "[MEM %u]: success\n", mr->mem->stag);
return &mr->base_mr;
err_out:
if (rv)
kfree(mr);
atomic_dec(&sdev->num_mr);
return ERR_PTR(rv);
}
/*
* siw_create_srq()
*
* Create Shared Receive Queue of attributes @init_attrs
* within protection domain given by @pd.
*
* @base_srq: Base SRQ contained in siw SRQ.
* @init_attrs: SRQ init attributes.
* @udata: points to user context
*/
int siw_create_srq(struct ib_srq *base_srq,
struct ib_srq_init_attr *init_attrs, struct ib_udata *udata)
{
struct siw_srq *srq = to_siw_srq(base_srq);
struct ib_srq_attr *attrs = &init_attrs->attr;
struct siw_device *sdev = to_siw_dev(base_srq->device);
struct siw_ucontext *ctx =
rdma_udata_to_drv_context(udata, struct siw_ucontext,
base_ucontext);
int rv;
if (init_attrs->srq_type != IB_SRQT_BASIC)
return -EOPNOTSUPP;
if (atomic_inc_return(&sdev->num_srq) > SIW_MAX_SRQ) {
siw_dbg_pd(base_srq->pd, "too many SRQ's\n");
rv = -ENOMEM;
goto err_out;
}
if (attrs->max_wr == 0 || attrs->max_wr > SIW_MAX_SRQ_WR ||
attrs->max_sge > SIW_MAX_SGE || attrs->srq_limit > attrs->max_wr) {
rv = -EINVAL;
goto err_out;
}
srq->max_sge = attrs->max_sge;
srq->num_rqe = roundup_pow_of_two(attrs->max_wr);
srq->limit = attrs->srq_limit;
if (srq->limit)
srq->armed = true;
srq->is_kernel_res = !udata;
if (udata)
srq->recvq =
vmalloc_user(srq->num_rqe * sizeof(struct siw_rqe));
else
srq->recvq = vzalloc(srq->num_rqe * sizeof(struct siw_rqe));
if (srq->recvq == NULL) {
rv = -ENOMEM;
goto err_out;
}
if (udata) {
struct siw_uresp_create_srq uresp = {};
size_t length = srq->num_rqe * sizeof(struct siw_rqe);
srq->srq_entry =
siw_mmap_entry_insert(ctx, srq->recvq,
length, &uresp.srq_key);
if (!srq->srq_entry) {
rv = -ENOMEM;
goto err_out;
}
uresp.num_rqe = srq->num_rqe;
if (udata->outlen < sizeof(uresp)) {
rv = -EINVAL;
goto err_out;
}
rv = ib_copy_to_udata(udata, &uresp, sizeof(uresp));
if (rv)
goto err_out;
}
spin_lock_init(&srq->lock);
siw_dbg_pd(base_srq->pd, "[SRQ]: success\n");
return 0;
err_out:
if (srq->recvq) {
if (ctx)
rdma_user_mmap_entry_remove(srq->srq_entry);
vfree(srq->recvq);
}
atomic_dec(&sdev->num_srq);
return rv;
}
/*
* siw_modify_srq()
*
* Modify SRQ. The caller may resize SRQ and/or set/reset notification
* limit and (re)arm IB_EVENT_SRQ_LIMIT_REACHED notification.
*
* NOTE: it is unclear if RDMA core allows for changing the MAX_SGE
* parameter. siw_modify_srq() does not check the attrs->max_sge param.
*/
int siw_modify_srq(struct ib_srq *base_srq, struct ib_srq_attr *attrs,
enum ib_srq_attr_mask attr_mask, struct ib_udata *udata)
{
struct siw_srq *srq = to_siw_srq(base_srq);
unsigned long flags;
int rv = 0;
spin_lock_irqsave(&srq->lock, flags);
if (attr_mask & IB_SRQ_MAX_WR) {
/* resize request not yet supported */
rv = -EOPNOTSUPP;
goto out;
}
if (attr_mask & IB_SRQ_LIMIT) {
if (attrs->srq_limit) {
if (unlikely(attrs->srq_limit > srq->num_rqe)) {
rv = -EINVAL;
goto out;
}
srq->armed = true;
} else {
srq->armed = false;
}
srq->limit = attrs->srq_limit;
}
out:
spin_unlock_irqrestore(&srq->lock, flags);
return rv;
}
/*
* siw_query_srq()
*
* Query SRQ attributes.
*/
int siw_query_srq(struct ib_srq *base_srq, struct ib_srq_attr *attrs)
{
struct siw_srq *srq = to_siw_srq(base_srq);
unsigned long flags;
spin_lock_irqsave(&srq->lock, flags);
attrs->max_wr = srq->num_rqe;
attrs->max_sge = srq->max_sge;
attrs->srq_limit = srq->limit;
spin_unlock_irqrestore(&srq->lock, flags);
return 0;
}
/*
* siw_destroy_srq()
*
* Destroy SRQ.
* It is assumed that the SRQ is not referenced by any
* QP anymore - the code trusts the RDMA core environment to keep track
* of QP references.
*/
int siw_destroy_srq(struct ib_srq *base_srq, struct ib_udata *udata)
{
struct siw_srq *srq = to_siw_srq(base_srq);
struct siw_device *sdev = to_siw_dev(base_srq->device);
struct siw_ucontext *ctx =
rdma_udata_to_drv_context(udata, struct siw_ucontext,
base_ucontext);
if (ctx)
rdma_user_mmap_entry_remove(srq->srq_entry);
vfree(srq->recvq);
atomic_dec(&sdev->num_srq);
return 0;
}
/*
* siw_post_srq_recv()
*
* Post a list of receive queue elements to SRQ.
* NOTE: The function does not check or lock a certain SRQ state
* during the post operation. The code simply trusts the
* RDMA core environment.
*
* @base_srq: Base SRQ contained in siw SRQ
* @wr: List of R-WR's
* @bad_wr: Updated to failing WR if posting fails.
*/
int siw_post_srq_recv(struct ib_srq *base_srq, const struct ib_recv_wr *wr,
const struct ib_recv_wr **bad_wr)
{
struct siw_srq *srq = to_siw_srq(base_srq);
unsigned long flags;
int rv = 0;
if (unlikely(!srq->is_kernel_res)) {
siw_dbg_pd(base_srq->pd,
"[SRQ]: no kernel post_recv for mapped srq\n");
rv = -EINVAL;
goto out;
}
/*
* Serialize potentially multiple producers.
* Also needed to serialize potentially multiple
* consumers.
*/
spin_lock_irqsave(&srq->lock, flags);
while (wr) {
u32 idx = srq->rq_put % srq->num_rqe;
struct siw_rqe *rqe = &srq->recvq[idx];
if (rqe->flags) {
siw_dbg_pd(base_srq->pd, "SRQ full\n");
rv = -ENOMEM;
break;
}
if (unlikely(wr->num_sge > srq->max_sge)) {
siw_dbg_pd(base_srq->pd,
"[SRQ]: too many sge's: %d\n", wr->num_sge);
rv = -EINVAL;
break;
}
rqe->id = wr->wr_id;
rqe->num_sge = wr->num_sge;
siw_copy_sgl(wr->sg_list, rqe->sge, wr->num_sge);
/* Make sure S-RQE is completely written before valid */
smp_wmb();
rqe->flags = SIW_WQE_VALID;
srq->rq_put++;
wr = wr->next;
}
spin_unlock_irqrestore(&srq->lock, flags);
out:
if (unlikely(rv < 0)) {
siw_dbg_pd(base_srq->pd, "[SRQ]: error %d\n", rv);
*bad_wr = wr;
}
return rv;
}
void siw_qp_event(struct siw_qp *qp, enum ib_event_type etype)
{
struct ib_event event;
struct ib_qp *base_qp = &qp->base_qp;
/*
* Do not report asynchronous errors on QP which gets
* destroyed via verbs interface (siw_destroy_qp())
*/
if (qp->attrs.flags & SIW_QP_IN_DESTROY)
return;
event.event = etype;
event.device = base_qp->device;
event.element.qp = base_qp;
if (base_qp->event_handler) {
siw_dbg_qp(qp, "reporting event %d\n", etype);
base_qp->event_handler(&event, base_qp->qp_context);
}
}
void siw_cq_event(struct siw_cq *cq, enum ib_event_type etype)
{
struct ib_event event;
struct ib_cq *base_cq = &cq->base_cq;
event.event = etype;
event.device = base_cq->device;
event.element.cq = base_cq;
if (base_cq->event_handler) {
siw_dbg_cq(cq, "reporting CQ event %d\n", etype);
base_cq->event_handler(&event, base_cq->cq_context);
}
}
void siw_srq_event(struct siw_srq *srq, enum ib_event_type etype)
{
struct ib_event event;
struct ib_srq *base_srq = &srq->base_srq;
event.event = etype;
event.device = base_srq->device;
event.element.srq = base_srq;
if (base_srq->event_handler) {
siw_dbg_pd(srq->base_srq.pd,
"reporting SRQ event %d\n", etype);
base_srq->event_handler(&event, base_srq->srq_context);
}
}
void siw_port_event(struct siw_device *sdev, u32 port, enum ib_event_type etype)
{
struct ib_event event;
event.event = etype;
event.device = &sdev->base_dev;
event.element.port_num = port;
siw_dbg(&sdev->base_dev, "reporting port event %d\n", etype);
ib_dispatch_event(&event);
}
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