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CIFS: SMBD: Support page offset in memory registration 

Change code to pass the correct page offset during memory registration for
RDMA read/write.

Signed-off-by: Long Li <longli@microsoft.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
This commit is contained in:
Long Li 2018-05-30 12:48:02 -07:00 committed by Steve French
parent 6509f50cd1
commit 7cf20bce77
3 changed files with 58 additions and 38 deletions
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18
fs/cifs/smb2pdu.c
View File

@ -2720,8 +2720,8 @@ smb2_new_read_req(void **buf, unsigned int *total_len,
rdata->mr = smbd_register_mr(
server->smbd_conn, rdata->pages,
rdata->nr_pages, rdata->tailsz,
true, need_invalidate);
rdata->nr_pages, rdata->page_offset,
rdata->tailsz, true, need_invalidate);
if (!rdata->mr)
return -ENOBUFS;
@ -3107,16 +3107,22 @@ smb2_async_writev(struct cifs_writedata *wdata,
wdata->mr = smbd_register_mr(
server->smbd_conn, wdata->pages,
wdata->nr_pages, wdata->tailsz,
false, need_invalidate);
wdata->nr_pages, wdata->page_offset,
wdata->tailsz, false, need_invalidate);
if (!wdata->mr) {
rc = -ENOBUFS;
goto async_writev_out;
}
req->Length = 0;
req->DataOffset = 0;
req->RemainingBytes =
cpu_to_le32((wdata->nr_pages-1)*PAGE_SIZE + wdata->tailsz);
if (wdata->nr_pages > 1)
req->RemainingBytes =
cpu_to_le32(
(wdata->nr_pages - 1) * wdata->pagesz -
wdata->page_offset + wdata->tailsz
);
else
req->RemainingBytes = cpu_to_le32(wdata->tailsz);
req->Channel = SMB2_CHANNEL_RDMA_V1_INVALIDATE;
if (need_invalidate)
req->Channel = SMB2_CHANNEL_RDMA_V1;

76
fs/cifs/smbdirect.c
View File

@ -2299,37 +2299,37 @@ static void smbd_mr_recovery_work(struct work_struct *work)
if (smbdirect_mr->state == MR_INVALIDATED ||
smbdirect_mr->state == MR_ERROR) {
if (smbdirect_mr->state == MR_INVALIDATED) {
/* recover this MR entry */
rc = ib_dereg_mr(smbdirect_mr->mr);
if (rc) {
log_rdma_mr(ERR,
"ib_dereg_mr failed rc=%x\n",
rc);
smbd_disconnect_rdma_connection(info);
continue;
}
smbdirect_mr->mr = ib_alloc_mr(
info->pd, info->mr_type,
info->max_frmr_depth);
if (IS_ERR(smbdirect_mr->mr)) {
log_rdma_mr(ERR,
"ib_alloc_mr failed mr_type=%x "
"max_frmr_depth=%x\n",
info->mr_type,
info->max_frmr_depth);
smbd_disconnect_rdma_connection(info);
continue;
}
if (smbdirect_mr->state == MR_INVALIDATED)
ib_dma_unmap_sg(
info->id->device, smbdirect_mr->sgl,
smbdirect_mr->sgl_count,
smbdirect_mr->dir);
smbdirect_mr->state = MR_READY;
} else if (smbdirect_mr->state == MR_ERROR) {
/* recover this MR entry */
rc = ib_dereg_mr(smbdirect_mr->mr);
if (rc) {
log_rdma_mr(ERR,
"ib_dereg_mr failed rc=%x\n",
rc);
smbd_disconnect_rdma_connection(info);
}
smbdirect_mr->state = MR_READY;
smbdirect_mr->mr = ib_alloc_mr(
info->pd, info->mr_type,
info->max_frmr_depth);
if (IS_ERR(smbdirect_mr->mr)) {
log_rdma_mr(ERR,
"ib_alloc_mr failed mr_type=%x "
"max_frmr_depth=%x\n",
info->mr_type,
info->max_frmr_depth);
smbd_disconnect_rdma_connection(info);
}
smbdirect_mr->state = MR_READY;
}
/* smbdirect_mr->state is updated by this function
* and is read and updated by I/O issuing CPUs trying
* to get a MR, the call to atomic_inc_return
@ -2475,7 +2475,7 @@ again:
*/
struct smbd_mr *smbd_register_mr(
struct smbd_connection *info, struct page *pages[], int num_pages,
int tailsz, bool writing, bool need_invalidate)
int offset, int tailsz, bool writing, bool need_invalidate)
{
struct smbd_mr *smbdirect_mr;
int rc, i;
@ -2498,17 +2498,31 @@ struct smbd_mr *smbd_register_mr(
smbdirect_mr->sgl_count = num_pages;
sg_init_table(smbdirect_mr->sgl, num_pages);
for (i = 0; i < num_pages - 1; i++)
sg_set_page(&smbdirect_mr->sgl[i], pages[i], PAGE_SIZE, 0);
log_rdma_mr(INFO, "num_pages=0x%x offset=0x%x tailsz=0x%x\n",
num_pages, offset, tailsz);
if (num_pages == 1) {
sg_set_page(&smbdirect_mr->sgl[0], pages[0], tailsz, offset);
goto skip_multiple_pages;
}
/* We have at least two pages to register */
sg_set_page(
&smbdirect_mr->sgl[0], pages[0], PAGE_SIZE - offset, offset);
i = 1;
while (i < num_pages - 1) {
sg_set_page(&smbdirect_mr->sgl[i], pages[i], PAGE_SIZE, 0);
i++;
}
sg_set_page(&smbdirect_mr->sgl[i], pages[i],
tailsz ? tailsz : PAGE_SIZE, 0);
skip_multiple_pages:
dir = writing ? DMA_FROM_DEVICE : DMA_TO_DEVICE;
smbdirect_mr->dir = dir;
rc = ib_dma_map_sg(info->id->device, smbdirect_mr->sgl, num_pages, dir);
if (!rc) {
log_rdma_mr(INFO, "ib_dma_map_sg num_pages=%x dir=%x rc=%x\n",
log_rdma_mr(ERR, "ib_dma_map_sg num_pages=%x dir=%x rc=%x\n",
num_pages, dir, rc);
goto dma_map_error;
}
@ -2516,8 +2530,8 @@ struct smbd_mr *smbd_register_mr(
rc = ib_map_mr_sg(smbdirect_mr->mr, smbdirect_mr->sgl, num_pages,
NULL, PAGE_SIZE);
if (rc != num_pages) {
log_rdma_mr(INFO,
"ib_map_mr_sg failed rc = %x num_pages = %x\n",
log_rdma_mr(ERR,
"ib_map_mr_sg failed rc = %d num_pages = %x\n",
rc, num_pages);
goto map_mr_error;
}

2
fs/cifs/smbdirect.h
View File

@ -321,7 +321,7 @@ struct smbd_mr {
/* Interfaces to register and deregister MR for RDMA read/write */
struct smbd_mr *smbd_register_mr(
struct smbd_connection *info, struct page *pages[], int num_pages,
int tailsz, bool writing, bool need_invalidate);
int offset, int tailsz, bool writing, bool need_invalidate);
int smbd_deregister_mr(struct smbd_mr *mr);
#else