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|
// 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 "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 || length > mr->ibmr.length ||
iova > mr->ibmr.iova + mr->ibmr.length - length)
return -EFAULT;
return 0;
default:
rxe_dbg_mr(mr, "type (%d) not supported\n", mr->ibmr.type);
return -EFAULT;
}
}
#define IB_ACCESS_REMOTE (IB_ACCESS_REMOTE_READ \
| IB_ACCESS_REMOTE_WRITE \
| IB_ACCESS_REMOTE_ATOMIC)
static void rxe_mr_init(int access, struct rxe_mr *mr)
{
u32 lkey = mr->elem.index << 8 | rxe_get_next_key(-1);
u32 rkey = (access & IB_ACCESS_REMOTE) ? lkey : 0;
/* 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 = lkey;
mr->rkey = mr->ibmr.rkey = rkey;
mr->state = RXE_MR_STATE_INVALID;
}
static int rxe_mr_alloc(struct rxe_mr *mr, int num_buf)
{
int i;
int num_map;
struct rxe_map **map = mr->map;
num_map = (num_buf + RXE_BUF_PER_MAP - 1) / RXE_BUF_PER_MAP;
mr->map = kmalloc_array(num_map, sizeof(*map), GFP_KERNEL);
if (!mr->map)
goto err1;
for (i = 0; i < num_map; i++) {
mr->map[i] = kmalloc(sizeof(**map), GFP_KERNEL);
if (!mr->map[i])
goto err2;
}
BUILD_BUG_ON(!is_power_of_2(RXE_BUF_PER_MAP));
mr->map_shift = ilog2(RXE_BUF_PER_MAP);
mr->map_mask = RXE_BUF_PER_MAP - 1;
mr->num_buf = num_buf;
mr->num_map = num_map;
mr->max_buf = num_map * RXE_BUF_PER_MAP;
return 0;
err2:
for (i--; i >= 0; i--)
kfree(mr->map[i]);
kfree(mr->map);
err1:
return -ENOMEM;
}
void rxe_mr_init_dma(int access, struct rxe_mr *mr)
{
rxe_mr_init(access, mr);
mr->access = access;
mr->state = RXE_MR_STATE_VALID;
mr->ibmr.type = IB_MR_TYPE_DMA;
}
int rxe_mr_init_user(struct rxe_dev *rxe, u64 start, u64 length, u64 iova,
int access, struct rxe_mr *mr)
{
struct rxe_map **map;
struct rxe_phys_buf *buf = NULL;
struct ib_umem *umem;
struct sg_page_iter sg_iter;
int num_buf;
void *vaddr;
int err;
int i;
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));
err = PTR_ERR(umem);
goto err_out;
}
num_buf = ib_umem_num_pages(umem);
rxe_mr_init(access, mr);
err = rxe_mr_alloc(mr, num_buf);
if (err) {
rxe_dbg_mr(mr, "Unable to allocate memory for map\n");
goto err_release_umem;
}
mr->page_shift = PAGE_SHIFT;
mr->page_mask = PAGE_SIZE - 1;
num_buf = 0;
map = mr->map;
if (length > 0) {
buf = map[0]->buf;
for_each_sgtable_page (&umem->sgt_append.sgt, &sg_iter, 0) {
if (num_buf >= RXE_BUF_PER_MAP) {
map++;
buf = map[0]->buf;
num_buf = 0;
}
vaddr = page_address(sg_page_iter_page(&sg_iter));
if (!vaddr) {
rxe_dbg_mr(mr, "Unable to get virtual address\n");
err = -ENOMEM;
goto err_cleanup_map;
}
buf->addr = (uintptr_t)vaddr;
buf->size = PAGE_SIZE;
num_buf++;
buf++;
}
}
mr->umem = umem;
mr->access = access;
mr->offset = ib_umem_offset(umem);
mr->state = RXE_MR_STATE_VALID;
mr->ibmr.type = IB_MR_TYPE_USER;
return 0;
err_cleanup_map:
for (i = 0; i < mr->num_map; i++)
kfree(mr->map[i]);
kfree(mr->map);
err_release_umem:
ib_umem_release(umem);
err_out:
return err;
}
int rxe_mr_init_fast(int max_pages, struct rxe_mr *mr)
{
int err;
/* always allow remote access for FMRs */
rxe_mr_init(IB_ACCESS_REMOTE, mr);
err = rxe_mr_alloc(mr, max_pages);
if (err)
goto err1;
mr->max_buf = max_pages;
mr->state = RXE_MR_STATE_FREE;
mr->ibmr.type = IB_MR_TYPE_MEM_REG;
return 0;
err1:
return err;
}
static void lookup_iova(struct rxe_mr *mr, u64 iova, int *m_out, int *n_out,
size_t *offset_out)
{
size_t offset = iova - mr->ibmr.iova + mr->offset;
int map_index;
int buf_index;
u64 length;
if (likely(mr->page_shift)) {
*offset_out = offset & mr->page_mask;
offset >>= mr->page_shift;
*n_out = offset & mr->map_mask;
*m_out = offset >> mr->map_shift;
} else {
map_index = 0;
buf_index = 0;
length = mr->map[map_index]->buf[buf_index].size;
while (offset >= length) {
offset -= length;
buf_index++;
if (buf_index == RXE_BUF_PER_MAP) {
map_index++;
buf_index = 0;
}
length = mr->map[map_index]->buf[buf_index].size;
}
*m_out = map_index;
*n_out = buf_index;
*offset_out = offset;
}
}
void *iova_to_vaddr(struct rxe_mr *mr, u64 iova, int length)
{
size_t offset;
int m, n;
void *addr;
if (mr->state != RXE_MR_STATE_VALID) {
rxe_dbg_mr(mr, "Not in valid state\n");
addr = NULL;
goto out;
}
if (!mr->map) {
addr = (void *)(uintptr_t)iova;
goto out;
}
if (mr_check_range(mr, iova, length)) {
rxe_dbg_mr(mr, "Range violation\n");
addr = NULL;
goto out;
}
lookup_iova(mr, iova, &m, &n, &offset);
if (offset + length > mr->map[m]->buf[n].size) {
rxe_dbg_mr(mr, "Crosses page boundary\n");
addr = NULL;
goto out;
}
addr = (void *)(uintptr_t)mr->map[m]->buf[n].addr + offset;
out:
return addr;
}
/* copy data from a range (vaddr, vaddr+length-1) to or from
* a mr object starting at iova.
*/
int rxe_mr_copy(struct rxe_mr *mr, u64 iova, void *addr, int length,
enum rxe_mr_copy_dir dir)
{
int err;
int bytes;
u8 *va;
struct rxe_map **map;
struct rxe_phys_buf *buf;
int m;
int i;
size_t offset;
if (length == 0)
return 0;
if (mr->ibmr.type == IB_MR_TYPE_DMA) {
u8 *src, *dest;
src = (dir == RXE_TO_MR_OBJ) ? addr : ((void *)(uintptr_t)iova);
dest = (dir == RXE_TO_MR_OBJ) ? ((void *)(uintptr_t)iova) : addr;
memcpy(dest, src, length);
return 0;
}
WARN_ON_ONCE(!mr->map);
err = mr_check_range(mr, iova, length);
if (err) {
err = -EFAULT;
goto err1;
}
lookup_iova(mr, iova, &m, &i, &offset);
map = mr->map + m;
buf = map[0]->buf + i;
while (length > 0) {
u8 *src, *dest;
va = (u8 *)(uintptr_t)buf->addr + offset;
src = (dir == RXE_TO_MR_OBJ) ? addr : va;
dest = (dir == RXE_TO_MR_OBJ) ? va : addr;
bytes = buf->size - offset;
if (bytes > length)
bytes = length;
memcpy(dest, src, bytes);
length -= bytes;
addr += bytes;
offset = 0;
buf++;
i++;
if (i == RXE_BUF_PER_MAP) {
i = 0;
map++;
buf = map[0]->buf;
}
}
return 0;
err1:
return err;
}
/* 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 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;
}
/* (1) find the mr corresponding to lkey/rkey
* depending on lookup_type
* (2) verify that the (qp) pd matches the mr pd
* (3) verify that the mr can support the requested access
* (4) verify that mr state is valid
*/
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 ret;
mr = rxe_pool_get_index(&rxe->mr_pool, key >> 8);
if (!mr) {
rxe_dbg_mr(mr, "No MR for key %#x\n", key);
ret = -EINVAL;
goto err;
}
if (mr->rkey ? (key != mr->rkey) : (key != mr->lkey)) {
rxe_dbg_mr(mr, "wr key (%#x) doesn't match mr key (%#x)\n",
key, (mr->rkey ? 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 = (access & IB_ACCESS_REMOTE) ? key : 0;
mr->ibmr.iova = wqe->wr.wr.reg.mr->iova;
mr->state = RXE_MR_STATE_VALID;
return 0;
}
int rxe_dereg_mr(struct ib_mr *ibmr, struct ib_udata *udata)
{
struct rxe_mr *mr = to_rmr(ibmr);
/* See IBA 10.6.7.2.6 */
if (atomic_read(&mr->num_mw) > 0)
return -EINVAL;
rxe_cleanup(mr);
return 0;
}
void rxe_mr_cleanup(struct rxe_pool_elem *elem)
{
struct rxe_mr *mr = container_of(elem, typeof(*mr), elem);
int i;
rxe_put(mr_pd(mr));
ib_umem_release(mr->umem);
if (mr->map) {
for (i = 0; i < mr->num_map; i++)
kfree(mr->map[i]);
kfree(mr->map);
}
}
|