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xprtrdma: Use same device when mapping or syncing DMA buffers 

When the underlying device driver is reloaded, ia->ri_device will be
replaced. All cached copies of that device pointer have to be
updated as well.

Commit 54cbd6b0c6 ("xprtrdma: Delay DMA mapping Send and Receive
buffers") added the rg_device field to each regbuf. As part of
handling a device removal, rpcrdma_dma_unmap_regbuf is invoked on
all regbufs for a transport.

Simply calling rpcrdma_dma_map_regbuf for each Receive buffer after
the driver has been reloaded should reinitialize rg_device correctly
for every case except rpcrdma_wc_receive, which still uses
rpcrdma_rep::rr_device.

Ensure the same device that was used to map a Receive buffer is also
used to sync it in rpcrdma_wc_receive by using rg_device there
instead of rr_device.

This is the only use of rr_device, so it can be removed.

The use of regbufs in the send path is also updated, for
completeness.

Fixes: 54cbd6b0c6 ("xprtrdma: Delay DMA mapping Send and ... ")
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
This commit is contained in:
Chuck Lever 2017-04-11 13:23:02 -04:00 committed by Anna Schumaker
parent fff09594ed
commit 91a10c5297
3 changed files with 14 additions and 9 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
net/sunrpc/xprtrdma/rpc_rdma.c
View File

@ -494,7 +494,7 @@ rpcrdma_prepare_hdr_sge(struct rpcrdma_ia *ia, struct rpcrdma_req *req,
}
sge->length = len;
ib_dma_sync_single_for_device(ia->ri_device, sge->addr,
ib_dma_sync_single_for_device(rdmab_device(rb), sge->addr,
sge->length, DMA_TO_DEVICE);
req->rl_send_wr.num_sge++;
return true;
@ -523,7 +523,7 @@ rpcrdma_prepare_msg_sges(struct rpcrdma_ia *ia, struct rpcrdma_req *req,
sge[sge_no].addr = rdmab_addr(rb);
sge[sge_no].length = xdr->head[0].iov_len;
sge[sge_no].lkey = rdmab_lkey(rb);
ib_dma_sync_single_for_device(device, sge[sge_no].addr,
ib_dma_sync_single_for_device(rdmab_device(rb), sge[sge_no].addr,
sge[sge_no].length, DMA_TO_DEVICE);
/* If there is a Read chunk, the page list is being handled

12
net/sunrpc/xprtrdma/verbs.c
View File

@ -180,7 +180,7 @@ rpcrdma_wc_receive(struct ib_cq *cq, struct ib_wc *wc)
rep->rr_wc_flags = wc->wc_flags;
rep->rr_inv_rkey = wc->ex.invalidate_rkey;
ib_dma_sync_single_for_cpu(rep->rr_device,
ib_dma_sync_single_for_cpu(rdmab_device(rep->rr_rdmabuf),
rdmab_addr(rep->rr_rdmabuf),
rep->rr_len, DMA_FROM_DEVICE);
@ -878,7 +878,6 @@ struct rpcrdma_rep *
rpcrdma_create_rep(struct rpcrdma_xprt *r_xprt)
{
struct rpcrdma_create_data_internal *cdata = &r_xprt->rx_data;
struct rpcrdma_ia *ia = &r_xprt->rx_ia;
struct rpcrdma_rep *rep;
int rc;
@ -894,7 +893,6 @@ rpcrdma_create_rep(struct rpcrdma_xprt *r_xprt)
goto out_free;
}
rep->rr_device = ia->ri_device;
rep->rr_cqe.done = rpcrdma_wc_receive;
rep->rr_rxprt = r_xprt;
INIT_WORK(&rep->rr_work, rpcrdma_reply_handler);
@ -1232,17 +1230,19 @@ rpcrdma_alloc_regbuf(size_t size, enum dma_data_direction direction,
bool
__rpcrdma_dma_map_regbuf(struct rpcrdma_ia *ia, struct rpcrdma_regbuf *rb)
{
struct ib_device *device = ia->ri_device;
if (rb->rg_direction == DMA_NONE)
return false;
rb->rg_iov.addr = ib_dma_map_single(ia->ri_device,
rb->rg_iov.addr = ib_dma_map_single(device,
(void *)rb->rg_base,
rdmab_length(rb),
rb->rg_direction);
if (ib_dma_mapping_error(ia->ri_device, rdmab_addr(rb)))
if (ib_dma_mapping_error(device, rdmab_addr(rb)))
return false;
rb->rg_device = ia->ri_device;
rb->rg_device = device;
rb->rg_iov.lkey = ia->ri_pd->local_dma_lkey;
return true;
}

7
net/sunrpc/xprtrdma/xprt_rdma.h
View File

@ -164,6 +164,12 @@ rdmab_to_msg(struct rpcrdma_regbuf *rb)
return (struct rpcrdma_msg *)rb->rg_base;
}
static inline struct ib_device *
rdmab_device(struct rpcrdma_regbuf *rb)
{
return rb->rg_device;
}
#define RPCRDMA_DEF_GFP (GFP_NOIO | __GFP_NOWARN)
/* To ensure a transport can always make forward progress,
@ -209,7 +215,6 @@ struct rpcrdma_rep {
unsigned int rr_len;
int rr_wc_flags;
u32 rr_inv_rkey;
struct ib_device *rr_device;
struct rpcrdma_xprt *rr_rxprt;
struct work_struct rr_work;
struct list_head rr_list;