blob: da3dee520876a3ab392637416524bf2c68450421 [file] [log] [blame]
// 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/libnvdimm.h>
#include "rxe.h"
#include "rxe_loc.h"
/* Return a random 8 bit key value that is
* different than the last_key. Set last_key to -1
* if this is the first key for an MR or MW
*/
u8 rxe_get_next_key(u32 last_key)
{
u8 key;
do {
get_random_bytes(&key, 1);
} while (key == last_key);
return key;
}
int mr_check_range(struct rxe_mr *mr, u64 iova, size_t length)
{
switch (mr->ibmr.type) {
case IB_MR_TYPE_DMA:
return 0;
case IB_MR_TYPE_USER:
case IB_MR_TYPE_MEM_REG:
if (iova < mr->ibmr.iova ||
iova + length > mr->ibmr.iova + mr->ibmr.length) {
rxe_dbg_mr(mr, "iova/length out of range\n");
return -EINVAL;
}
return 0;
default:
rxe_dbg_mr(mr, "mr type not supported\n");
return -EINVAL;
}
}
static void rxe_mr_init(int access, struct rxe_mr *mr)
{
u32 key = mr->elem.index << 8 | rxe_get_next_key(-1);
/* set ibmr->l/rkey and also copy into private l/rkey
* for user MRs these will always be the same
* for cases where caller 'owns' the key portion
* they may be different until REG_MR WQE is executed.
*/
mr->lkey = mr->ibmr.lkey = key;
mr->rkey = mr->ibmr.rkey = key;
mr->access = access;
mr->ibmr.page_size = PAGE_SIZE;
mr->page_mask = PAGE_MASK;
mr->page_shift = PAGE_SHIFT;
mr->state = RXE_MR_STATE_INVALID;
}
void rxe_mr_init_dma(int access, struct rxe_mr *mr)
{
rxe_mr_init(access, mr);
mr->state = RXE_MR_STATE_VALID;
mr->ibmr.type = IB_MR_TYPE_DMA;
}
static unsigned long rxe_mr_iova_to_index(struct rxe_mr *mr, u64 iova)
{
return (iova >> mr->page_shift) - (mr->ibmr.iova >> mr->page_shift);
}
static unsigned long rxe_mr_iova_to_page_offset(struct rxe_mr *mr, u64 iova)
{
return iova & (mr_page_size(mr) - 1);
}
static bool is_pmem_page(struct page *pg)
{
unsigned long paddr = page_to_phys(pg);
return REGION_INTERSECTS ==
region_intersects(paddr, PAGE_SIZE, IORESOURCE_MEM,
IORES_DESC_PERSISTENT_MEMORY);
}
static int rxe_mr_fill_pages_from_sgt(struct rxe_mr *mr, struct sg_table *sgt)
{
XA_STATE(xas, &mr->page_list, 0);
struct sg_page_iter sg_iter;
struct page *page;
bool persistent = !!(mr->access & IB_ACCESS_FLUSH_PERSISTENT);
__sg_page_iter_start(&sg_iter, sgt->sgl, sgt->orig_nents, 0);
if (!__sg_page_iter_next(&sg_iter))
return 0;
do {
xas_lock(&xas);
while (true) {
page = sg_page_iter_page(&sg_iter);
if (persistent && !is_pmem_page(page)) {
rxe_dbg_mr(mr, "Page can't be persistent\n");
xas_set_err(&xas, -EINVAL);
break;
}
xas_store(&xas, page);
if (xas_error(&xas))
break;
xas_next(&xas);
if (!__sg_page_iter_next(&sg_iter))
break;
}
xas_unlock(&xas);
} while (xas_nomem(&xas, GFP_KERNEL));
return xas_error(&xas);
}
int rxe_mr_init_user(struct rxe_dev *rxe, u64 start, u64 length,
int access, struct rxe_mr *mr)
{
struct ib_umem *umem;
int err;
rxe_mr_init(access, mr);
xa_init(&mr->page_list);
umem = ib_umem_get(&rxe->ib_dev, start, length, access);
if (IS_ERR(umem)) {
rxe_dbg_mr(mr, "Unable to pin memory region err = %d\n",
(int)PTR_ERR(umem));
return PTR_ERR(umem);
}
err = rxe_mr_fill_pages_from_sgt(mr, &umem->sgt_append.sgt);
if (err) {
ib_umem_release(umem);
return err;
}
mr->umem = umem;
mr->ibmr.type = IB_MR_TYPE_USER;
mr->state = RXE_MR_STATE_VALID;
return 0;
}
static int rxe_mr_alloc(struct rxe_mr *mr, int num_buf)
{
XA_STATE(xas, &mr->page_list, 0);
int i = 0;
int err;
xa_init(&mr->page_list);
do {
xas_lock(&xas);
while (i != num_buf) {
xas_store(&xas, XA_ZERO_ENTRY);
if (xas_error(&xas))
break;
xas_next(&xas);
i++;
}
xas_unlock(&xas);
} while (xas_nomem(&xas, GFP_KERNEL));
err = xas_error(&xas);
if (err)
return err;
mr->num_buf = num_buf;
return 0;
}
int rxe_mr_init_fast(int max_pages, struct rxe_mr *mr)
{
int err;
/* always allow remote access for FMRs */
rxe_mr_init(RXE_ACCESS_REMOTE, mr);
err = rxe_mr_alloc(mr, max_pages);
if (err)
goto err1;
mr->state = RXE_MR_STATE_FREE;
mr->ibmr.type = IB_MR_TYPE_MEM_REG;
return 0;
err1:
return err;
}
static int rxe_set_page(struct ib_mr *ibmr, u64 dma_addr)
{
struct rxe_mr *mr = to_rmr(ibmr);
struct page *page = ib_virt_dma_to_page(dma_addr);
bool persistent = !!(mr->access & IB_ACCESS_FLUSH_PERSISTENT);
int err;
if (persistent && !is_pmem_page(page)) {
rxe_dbg_mr(mr, "Page cannot be persistent\n");
return -EINVAL;
}
if (unlikely(mr->nbuf == mr->num_buf))
return -ENOMEM;
err = xa_err(xa_store(&mr->page_list, mr->nbuf, page, GFP_KERNEL));
if (err)
return err;
mr->nbuf++;
return 0;
}
int rxe_map_mr_sg(struct ib_mr *ibmr, struct scatterlist *sgl,
int sg_nents, unsigned int *sg_offset)
{
struct rxe_mr *mr = to_rmr(ibmr);
unsigned int page_size = mr_page_size(mr);
mr->nbuf = 0;
mr->page_shift = ilog2(page_size);
mr->page_mask = ~((u64)page_size - 1);
mr->page_offset = mr->ibmr.iova & (page_size - 1);
return ib_sg_to_pages(ibmr, sgl, sg_nents, sg_offset, rxe_set_page);
}
static int rxe_mr_copy_xarray(struct rxe_mr *mr, u64 iova, void *addr,
unsigned int length, enum rxe_mr_copy_dir dir)
{
unsigned int page_offset = rxe_mr_iova_to_page_offset(mr, iova);
unsigned long index = rxe_mr_iova_to_index(mr, iova);
unsigned int bytes;
struct page *page;
void *va;
while (length) {
page = xa_load(&mr->page_list, index);
if (!page)
return -EFAULT;
bytes = min_t(unsigned int, length,
mr_page_size(mr) - page_offset);
va = kmap_local_page(page);
if (dir == RXE_FROM_MR_OBJ)
memcpy(addr, va + page_offset, bytes);
else
memcpy(va + page_offset, addr, bytes);
kunmap_local(va);
page_offset = 0;
addr += bytes;
length -= bytes;
index++;
}
return 0;
}
static void rxe_mr_copy_dma(struct rxe_mr *mr, u64 dma_addr, void *addr,
unsigned int length, enum rxe_mr_copy_dir dir)
{
unsigned int page_offset = dma_addr & (PAGE_SIZE - 1);
unsigned int bytes;
struct page *page;
u8 *va;
while (length) {
page = ib_virt_dma_to_page(dma_addr);
bytes = min_t(unsigned int, length,
PAGE_SIZE - page_offset);
va = kmap_local_page(page);
if (dir == RXE_TO_MR_OBJ)
memcpy(va + page_offset, addr, bytes);
else
memcpy(addr, va + page_offset, bytes);
kunmap_local(va);
page_offset = 0;
dma_addr += bytes;
addr += bytes;
length -= bytes;
}
}
int rxe_mr_copy(struct rxe_mr *mr, u64 iova, void *addr,
unsigned int length, enum rxe_mr_copy_dir dir)
{
int err;
if (length == 0)
return 0;
if (WARN_ON(!mr))
return -EINVAL;
if (mr->ibmr.type == IB_MR_TYPE_DMA) {
rxe_mr_copy_dma(mr, iova, addr, length, dir);
return 0;
}
err = mr_check_range(mr, iova, length);
if (unlikely(err)) {
rxe_dbg_mr(mr, "iova out of range\n");
return err;
}
return rxe_mr_copy_xarray(mr, iova, addr, length, dir);
}
/* copy data in or out of a wqe, i.e. sg list
* under the control of a dma descriptor
*/
int copy_data(
struct rxe_pd *pd,
int access,
struct rxe_dma_info *dma,
void *addr,
int length,
enum rxe_mr_copy_dir dir)
{
int bytes;
struct rxe_sge *sge = &dma->sge[dma->cur_sge];
int offset = dma->sge_offset;
int resid = dma->resid;
struct rxe_mr *mr = NULL;
u64 iova;
int err;
if (length == 0)
return 0;
if (length > resid) {
err = -EINVAL;
goto err2;
}
if (sge->length && (offset < sge->length)) {
mr = lookup_mr(pd, access, sge->lkey, RXE_LOOKUP_LOCAL);
if (!mr) {
err = -EINVAL;
goto err1;
}
}
while (length > 0) {
bytes = length;
if (offset >= sge->length) {
if (mr) {
rxe_put(mr);
mr = NULL;
}
sge++;
dma->cur_sge++;
offset = 0;
if (dma->cur_sge >= dma->num_sge) {
err = -ENOSPC;
goto err2;
}
if (sge->length) {
mr = lookup_mr(pd, access, sge->lkey,
RXE_LOOKUP_LOCAL);
if (!mr) {
err = -EINVAL;
goto err1;
}
} else {
continue;
}
}
if (bytes > sge->length - offset)
bytes = sge->length - offset;
if (bytes > 0) {
iova = sge->addr + offset;
err = rxe_mr_copy(mr, iova, addr, bytes, dir);
if (err)
goto err2;
offset += bytes;
resid -= bytes;
length -= bytes;
addr += bytes;
}
}
dma->sge_offset = offset;
dma->resid = resid;
if (mr)
rxe_put(mr);
return 0;
err2:
if (mr)
rxe_put(mr);
err1:
return err;
}
int rxe_flush_pmem_iova(struct rxe_mr *mr, u64 iova, unsigned int length)
{
unsigned int page_offset;
unsigned long index;
struct page *page;
unsigned int bytes;
int err;
u8 *va;
/* mr must be valid even if length is zero */
if (WARN_ON(!mr))
return -EINVAL;
if (length == 0)
return 0;
if (mr->ibmr.type == IB_MR_TYPE_DMA)
return -EFAULT;
err = mr_check_range(mr, iova, length);
if (err)
return err;
while (length > 0) {
index = rxe_mr_iova_to_index(mr, iova);
page = xa_load(&mr->page_list, index);
page_offset = rxe_mr_iova_to_page_offset(mr, iova);
if (!page)
return -EFAULT;
bytes = min_t(unsigned int, length,
mr_page_size(mr) - page_offset);
va = kmap_local_page(page);
arch_wb_cache_pmem(va + page_offset, bytes);
kunmap_local(va);
length -= bytes;
iova += bytes;
page_offset = 0;
}
return 0;
}
/* Guarantee atomicity of atomic operations at the machine level. */
static DEFINE_SPINLOCK(atomic_ops_lock);
int rxe_mr_do_atomic_op(struct rxe_mr *mr, u64 iova, int opcode,
u64 compare, u64 swap_add, u64 *orig_val)
{
unsigned int page_offset;
struct page *page;
u64 value;
u64 *va;
if (unlikely(mr->state != RXE_MR_STATE_VALID)) {
rxe_dbg_mr(mr, "mr not in valid state\n");
return RESPST_ERR_RKEY_VIOLATION;
}
if (mr->ibmr.type == IB_MR_TYPE_DMA) {
page_offset = iova & (PAGE_SIZE - 1);
page = ib_virt_dma_to_page(iova);
} else {
unsigned long index;
int err;
err = mr_check_range(mr, iova, sizeof(value));
if (err) {
rxe_dbg_mr(mr, "iova out of range\n");
return RESPST_ERR_RKEY_VIOLATION;
}
page_offset = rxe_mr_iova_to_page_offset(mr, iova);
index = rxe_mr_iova_to_index(mr, iova);
page = xa_load(&mr->page_list, index);
if (!page)
return RESPST_ERR_RKEY_VIOLATION;
}
if (unlikely(page_offset & 0x7)) {
rxe_dbg_mr(mr, "iova not aligned\n");
return RESPST_ERR_MISALIGNED_ATOMIC;
}
va = kmap_local_page(page);
spin_lock_bh(&atomic_ops_lock);
value = *orig_val = va[page_offset >> 3];
if (opcode == IB_OPCODE_RC_COMPARE_SWAP) {
if (value == compare)
va[page_offset >> 3] = swap_add;
} else {
value += swap_add;
va[page_offset >> 3] = value;
}
spin_unlock_bh(&atomic_ops_lock);
kunmap_local(va);
return 0;
}
#if defined CONFIG_64BIT
/* only implemented or called for 64 bit architectures */
int rxe_mr_do_atomic_write(struct rxe_mr *mr, u64 iova, u64 value)
{
unsigned int page_offset;
struct page *page;
u64 *va;
/* See IBA oA19-28 */
if (unlikely(mr->state != RXE_MR_STATE_VALID)) {
rxe_dbg_mr(mr, "mr not in valid state\n");
return RESPST_ERR_RKEY_VIOLATION;
}
if (mr->ibmr.type == IB_MR_TYPE_DMA) {
page_offset = iova & (PAGE_SIZE - 1);
page = ib_virt_dma_to_page(iova);
} else {
unsigned long index;
int err;
/* See IBA oA19-28 */
err = mr_check_range(mr, iova, sizeof(value));
if (unlikely(err)) {
rxe_dbg_mr(mr, "iova out of range\n");
return RESPST_ERR_RKEY_VIOLATION;
}
page_offset = rxe_mr_iova_to_page_offset(mr, iova);
index = rxe_mr_iova_to_index(mr, iova);
page = xa_load(&mr->page_list, index);
if (!page)
return RESPST_ERR_RKEY_VIOLATION;
}
/* See IBA A19.4.2 */
if (unlikely(page_offset & 0x7)) {
rxe_dbg_mr(mr, "misaligned address\n");
return RESPST_ERR_MISALIGNED_ATOMIC;
}
va = kmap_local_page(page);
/* Do atomic write after all prior operations have completed */
smp_store_release(&va[page_offset >> 3], value);
kunmap_local(va);
return 0;
}
#else
int rxe_mr_do_atomic_write(struct rxe_mr *mr, u64 iova, u64 value)
{
return RESPST_ERR_UNSUPPORTED_OPCODE;
}
#endif
int advance_dma_data(struct rxe_dma_info *dma, unsigned int length)
{
struct rxe_sge *sge = &dma->sge[dma->cur_sge];
int offset = dma->sge_offset;
int resid = dma->resid;
while (length) {
unsigned int bytes;
if (offset >= sge->length) {
sge++;
dma->cur_sge++;
offset = 0;
if (dma->cur_sge >= dma->num_sge)
return -ENOSPC;
}
bytes = length;
if (bytes > sge->length - offset)
bytes = sge->length - offset;
offset += bytes;
resid -= bytes;
length -= bytes;
}
dma->sge_offset = offset;
dma->resid = resid;
return 0;
}
struct rxe_mr *lookup_mr(struct rxe_pd *pd, int access, u32 key,
enum rxe_mr_lookup_type type)
{
struct rxe_mr *mr;
struct rxe_dev *rxe = to_rdev(pd->ibpd.device);
int index = key >> 8;
mr = rxe_pool_get_index(&rxe->mr_pool, index);
if (!mr)
return NULL;
if (unlikely((type == RXE_LOOKUP_LOCAL && mr->lkey != key) ||
(type == RXE_LOOKUP_REMOTE && mr->rkey != key) ||
mr_pd(mr) != pd || ((access & mr->access) != access) ||
mr->state != RXE_MR_STATE_VALID)) {
rxe_put(mr);
mr = NULL;
}
return mr;
}
int rxe_invalidate_mr(struct rxe_qp *qp, u32 key)
{
struct rxe_dev *rxe = to_rdev(qp->ibqp.device);
struct rxe_mr *mr;
int remote;
int ret;
mr = rxe_pool_get_index(&rxe->mr_pool, key >> 8);
if (!mr) {
rxe_dbg_qp(qp, "No MR for key %#x\n", key);
ret = -EINVAL;
goto err;
}
remote = mr->access & RXE_ACCESS_REMOTE;
if (remote ? (key != mr->rkey) : (key != mr->lkey)) {
rxe_dbg_mr(mr, "wr key (%#x) doesn't match mr key (%#x)\n",
key, (remote ? mr->rkey : mr->lkey));
ret = -EINVAL;
goto err_drop_ref;
}
if (atomic_read(&mr->num_mw) > 0) {
rxe_dbg_mr(mr, "Attempt to invalidate an MR while bound to MWs\n");
ret = -EINVAL;
goto err_drop_ref;
}
if (unlikely(mr->ibmr.type != IB_MR_TYPE_MEM_REG)) {
rxe_dbg_mr(mr, "Type (%d) is wrong\n", mr->ibmr.type);
ret = -EINVAL;
goto err_drop_ref;
}
mr->state = RXE_MR_STATE_FREE;
ret = 0;
err_drop_ref:
rxe_put(mr);
err:
return ret;
}
/* user can (re)register fast MR by executing a REG_MR WQE.
* user is expected to hold a reference on the ib mr until the
* WQE completes.
* Once a fast MR is created this is the only way to change the
* private keys. It is the responsibility of the user to maintain
* the ib mr keys in sync with rxe mr keys.
*/
int rxe_reg_fast_mr(struct rxe_qp *qp, struct rxe_send_wqe *wqe)
{
struct rxe_mr *mr = to_rmr(wqe->wr.wr.reg.mr);
u32 key = wqe->wr.wr.reg.key;
u32 access = wqe->wr.wr.reg.access;
/* user can only register MR in free state */
if (unlikely(mr->state != RXE_MR_STATE_FREE)) {
rxe_dbg_mr(mr, "mr->lkey = 0x%x not free\n", mr->lkey);
return -EINVAL;
}
/* user can only register mr with qp in same protection domain */
if (unlikely(qp->ibqp.pd != mr->ibmr.pd)) {
rxe_dbg_mr(mr, "qp->pd and mr->pd don't match\n");
return -EINVAL;
}
/* user is only allowed to change key portion of l/rkey */
if (unlikely((mr->lkey & ~0xff) != (key & ~0xff))) {
rxe_dbg_mr(mr, "key = 0x%x has wrong index mr->lkey = 0x%x\n",
key, mr->lkey);
return -EINVAL;
}
mr->access = access;
mr->lkey = key;
mr->rkey = key;
mr->ibmr.iova = wqe->wr.wr.reg.mr->iova;
mr->state = RXE_MR_STATE_VALID;
return 0;
}
void rxe_mr_cleanup(struct rxe_pool_elem *elem)
{
struct rxe_mr *mr = container_of(elem, typeof(*mr), elem);
rxe_put(mr_pd(mr));
ib_umem_release(mr->umem);
if (mr->ibmr.type != IB_MR_TYPE_DMA)
xa_destroy(&mr->page_list);
}