aboutsummaryrefslogtreecommitdiff
path: root/net/sunrpc/xprtrdma/svc_rdma_sendto.c
diff options
context:
space:
mode:
Diffstat (limited to 'net/sunrpc/xprtrdma/svc_rdma_sendto.c')
-rw-r--r--net/sunrpc/xprtrdma/svc_rdma_sendto.c166
1 files changed, 79 insertions, 87 deletions
diff --git a/net/sunrpc/xprtrdma/svc_rdma_sendto.c b/net/sunrpc/xprtrdma/svc_rdma_sendto.c
index fb82b1b683f..a19b22b452a 100644
--- a/net/sunrpc/xprtrdma/svc_rdma_sendto.c
+++ b/net/sunrpc/xprtrdma/svc_rdma_sendto.c
@@ -63,52 +63,44 @@
* SGE[2..sge_count-2] data from xdr->pages[]
* SGE[sge_count-1] data from xdr->tail.
*
+ * The max SGE we need is the length of the XDR / pagesize + one for
+ * head + one for tail + one for RPCRDMA header. Since RPCSVC_MAXPAGES
+ * reserves a page for both the request and the reply header, and this
+ * array is only concerned with the reply we are assured that we have
+ * on extra page for the RPCRMDA header.
*/
-static struct ib_sge *xdr_to_sge(struct svcxprt_rdma *xprt,
- struct xdr_buf *xdr,
- struct ib_sge *sge,
- int *sge_count)
+static void xdr_to_sge(struct svcxprt_rdma *xprt,
+ struct xdr_buf *xdr,
+ struct svc_rdma_req_map *vec)
{
- /* Max we need is the length of the XDR / pagesize + one for
- * head + one for tail + one for RPCRDMA header
- */
int sge_max = (xdr->len+PAGE_SIZE-1) / PAGE_SIZE + 3;
int sge_no;
- u32 byte_count = xdr->len;
u32 sge_bytes;
u32 page_bytes;
- int page_off;
+ u32 page_off;
int page_no;
+ BUG_ON(xdr->len !=
+ (xdr->head[0].iov_len + xdr->page_len + xdr->tail[0].iov_len));
+
/* Skip the first sge, this is for the RPCRDMA header */
sge_no = 1;
/* Head SGE */
- sge[sge_no].addr = ib_dma_map_single(xprt->sc_cm_id->device,
- xdr->head[0].iov_base,
- xdr->head[0].iov_len,
- DMA_TO_DEVICE);
- sge_bytes = min_t(u32, byte_count, xdr->head[0].iov_len);
- byte_count -= sge_bytes;
- sge[sge_no].length = sge_bytes;
- sge[sge_no].lkey = xprt->sc_phys_mr->lkey;
+ vec->sge[sge_no].iov_base = xdr->head[0].iov_base;
+ vec->sge[sge_no].iov_len = xdr->head[0].iov_len;
sge_no++;
/* pages SGE */
page_no = 0;
page_bytes = xdr->page_len;
page_off = xdr->page_base;
- while (byte_count && page_bytes) {
- sge_bytes = min_t(u32, byte_count, (PAGE_SIZE-page_off));
- sge[sge_no].addr =
- ib_dma_map_page(xprt->sc_cm_id->device,
- xdr->pages[page_no], page_off,
- sge_bytes, DMA_TO_DEVICE);
- sge_bytes = min(sge_bytes, page_bytes);
- byte_count -= sge_bytes;
+ while (page_bytes) {
+ vec->sge[sge_no].iov_base =
+ page_address(xdr->pages[page_no]) + page_off;
+ sge_bytes = min_t(u32, page_bytes, (PAGE_SIZE - page_off));
page_bytes -= sge_bytes;
- sge[sge_no].length = sge_bytes;
- sge[sge_no].lkey = xprt->sc_phys_mr->lkey;
+ vec->sge[sge_no].iov_len = sge_bytes;
sge_no++;
page_no++;
@@ -116,36 +108,24 @@ static struct ib_sge *xdr_to_sge(struct svcxprt_rdma *xprt,
}
/* Tail SGE */
- if (byte_count && xdr->tail[0].iov_len) {
- sge[sge_no].addr =
- ib_dma_map_single(xprt->sc_cm_id->device,
- xdr->tail[0].iov_base,
- xdr->tail[0].iov_len,
- DMA_TO_DEVICE);
- sge_bytes = min_t(u32, byte_count, xdr->tail[0].iov_len);
- byte_count -= sge_bytes;
- sge[sge_no].length = sge_bytes;
- sge[sge_no].lkey = xprt->sc_phys_mr->lkey;
+ if (xdr->tail[0].iov_len) {
+ vec->sge[sge_no].iov_base = xdr->tail[0].iov_base;
+ vec->sge[sge_no].iov_len = xdr->tail[0].iov_len;
sge_no++;
}
BUG_ON(sge_no > sge_max);
- BUG_ON(byte_count != 0);
-
- *sge_count = sge_no;
- return sge;
+ vec->count = sge_no;
}
-
/* Assumptions:
* - The specified write_len can be represented in sc_max_sge * PAGE_SIZE
*/
static int send_write(struct svcxprt_rdma *xprt, struct svc_rqst *rqstp,
u32 rmr, u64 to,
u32 xdr_off, int write_len,
- struct ib_sge *xdr_sge, int sge_count)
+ struct svc_rdma_req_map *vec)
{
- struct svc_rdma_op_ctxt *tmp_sge_ctxt;
struct ib_send_wr write_wr;
struct ib_sge *sge;
int xdr_sge_no;
@@ -154,25 +134,23 @@ static int send_write(struct svcxprt_rdma *xprt, struct svc_rqst *rqstp,
int sge_off;
int bc;
struct svc_rdma_op_ctxt *ctxt;
- int ret = 0;
- BUG_ON(sge_count > RPCSVC_MAXPAGES);
+ BUG_ON(vec->count > RPCSVC_MAXPAGES);
dprintk("svcrdma: RDMA_WRITE rmr=%x, to=%llx, xdr_off=%d, "
- "write_len=%d, xdr_sge=%p, sge_count=%d\n",
+ "write_len=%d, vec->sge=%p, vec->count=%lu\n",
rmr, (unsigned long long)to, xdr_off,
- write_len, xdr_sge, sge_count);
+ write_len, vec->sge, vec->count);
ctxt = svc_rdma_get_context(xprt);
- ctxt->count = 0;
- tmp_sge_ctxt = svc_rdma_get_context(xprt);
- sge = tmp_sge_ctxt->sge;
+ ctxt->direction = DMA_TO_DEVICE;
+ sge = ctxt->sge;
/* Find the SGE associated with xdr_off */
- for (bc = xdr_off, xdr_sge_no = 1; bc && xdr_sge_no < sge_count;
+ for (bc = xdr_off, xdr_sge_no = 1; bc && xdr_sge_no < vec->count;
xdr_sge_no++) {
- if (xdr_sge[xdr_sge_no].length > bc)
+ if (vec->sge[xdr_sge_no].iov_len > bc)
break;
- bc -= xdr_sge[xdr_sge_no].length;
+ bc -= vec->sge[xdr_sge_no].iov_len;
}
sge_off = bc;
@@ -180,21 +158,28 @@ static int send_write(struct svcxprt_rdma *xprt, struct svc_rqst *rqstp,
sge_no = 0;
/* Copy the remaining SGE */
- while (bc != 0 && xdr_sge_no < sge_count) {
- sge[sge_no].addr = xdr_sge[xdr_sge_no].addr + sge_off;
- sge[sge_no].lkey = xdr_sge[xdr_sge_no].lkey;
+ while (bc != 0 && xdr_sge_no < vec->count) {
+ sge[sge_no].lkey = xprt->sc_phys_mr->lkey;
sge_bytes = min((size_t)bc,
- (size_t)(xdr_sge[xdr_sge_no].length-sge_off));
+ (size_t)(vec->sge[xdr_sge_no].iov_len-sge_off));
sge[sge_no].length = sge_bytes;
-
+ atomic_inc(&xprt->sc_dma_used);
+ sge[sge_no].addr =
+ ib_dma_map_single(xprt->sc_cm_id->device,
+ (void *)
+ vec->sge[xdr_sge_no].iov_base + sge_off,
+ sge_bytes, DMA_TO_DEVICE);
+ if (dma_mapping_error(sge[sge_no].addr))
+ goto err;
sge_off = 0;
sge_no++;
+ ctxt->count++;
xdr_sge_no++;
bc -= sge_bytes;
}
BUG_ON(bc != 0);
- BUG_ON(xdr_sge_no > sge_count);
+ BUG_ON(xdr_sge_no > vec->count);
/* Prepare WRITE WR */
memset(&write_wr, 0, sizeof write_wr);
@@ -209,21 +194,20 @@ static int send_write(struct svcxprt_rdma *xprt, struct svc_rqst *rqstp,
/* Post It */
atomic_inc(&rdma_stat_write);
- if (svc_rdma_send(xprt, &write_wr)) {
- svc_rdma_put_context(ctxt, 1);
- /* Fatal error, close transport */
- ret = -EIO;
- }
- svc_rdma_put_context(tmp_sge_ctxt, 0);
- return ret;
+ if (svc_rdma_send(xprt, &write_wr))
+ goto err;
+ return 0;
+ err:
+ svc_rdma_put_context(ctxt, 0);
+ /* Fatal error, close transport */
+ return -EIO;
}
static int send_write_chunks(struct svcxprt_rdma *xprt,
struct rpcrdma_msg *rdma_argp,
struct rpcrdma_msg *rdma_resp,
struct svc_rqst *rqstp,
- struct ib_sge *sge,
- int sge_count)
+ struct svc_rdma_req_map *vec)
{
u32 xfer_len = rqstp->rq_res.page_len + rqstp->rq_res.tail[0].iov_len;
int write_len;
@@ -269,8 +253,7 @@ static int send_write_chunks(struct svcxprt_rdma *xprt,
rs_offset + chunk_off,
xdr_off,
this_write,
- sge,
- sge_count);
+ vec);
if (ret) {
dprintk("svcrdma: RDMA_WRITE failed, ret=%d\n",
ret);
@@ -292,8 +275,7 @@ static int send_reply_chunks(struct svcxprt_rdma *xprt,
struct rpcrdma_msg *rdma_argp,
struct rpcrdma_msg *rdma_resp,
struct svc_rqst *rqstp,
- struct ib_sge *sge,
- int sge_count)
+ struct svc_rdma_req_map *vec)
{
u32 xfer_len = rqstp->rq_res.len;
int write_len;
@@ -341,8 +323,7 @@ static int send_reply_chunks(struct svcxprt_rdma *xprt,
rs_offset + chunk_off,
xdr_off,
this_write,
- sge,
- sge_count);
+ vec);
if (ret) {
dprintk("svcrdma: RDMA_WRITE failed, ret=%d\n",
ret);
@@ -380,7 +361,7 @@ static int send_reply(struct svcxprt_rdma *rdma,
struct page *page,
struct rpcrdma_msg *rdma_resp,
struct svc_rdma_op_ctxt *ctxt,
- int sge_count,
+ struct svc_rdma_req_map *vec,
int byte_count)
{
struct ib_send_wr send_wr;
@@ -405,6 +386,7 @@ static int send_reply(struct svcxprt_rdma *rdma,
ctxt->count = 1;
/* Prepare the SGE for the RPCRDMA Header */
+ atomic_inc(&rdma->sc_dma_used);
ctxt->sge[0].addr =
ib_dma_map_page(rdma->sc_cm_id->device,
page, 0, PAGE_SIZE, DMA_TO_DEVICE);
@@ -413,10 +395,16 @@ static int send_reply(struct svcxprt_rdma *rdma,
ctxt->sge[0].lkey = rdma->sc_phys_mr->lkey;
/* Determine how many of our SGE are to be transmitted */
- for (sge_no = 1; byte_count && sge_no < sge_count; sge_no++) {
- sge_bytes = min((size_t)ctxt->sge[sge_no].length,
- (size_t)byte_count);
+ for (sge_no = 1; byte_count && sge_no < vec->count; sge_no++) {
+ sge_bytes = min_t(size_t, vec->sge[sge_no].iov_len, byte_count);
byte_count -= sge_bytes;
+ atomic_inc(&rdma->sc_dma_used);
+ ctxt->sge[sge_no].addr =
+ ib_dma_map_single(rdma->sc_cm_id->device,
+ vec->sge[sge_no].iov_base,
+ sge_bytes, DMA_TO_DEVICE);
+ ctxt->sge[sge_no].length = sge_bytes;
+ ctxt->sge[sge_no].lkey = rdma->sc_phys_mr->lkey;
}
BUG_ON(byte_count != 0);
@@ -428,8 +416,10 @@ static int send_reply(struct svcxprt_rdma *rdma,
ctxt->pages[page_no+1] = rqstp->rq_respages[page_no];
ctxt->count++;
rqstp->rq_respages[page_no] = NULL;
+ /* If there are more pages than SGE, terminate SGE list */
+ if (page_no+1 >= sge_no)
+ ctxt->sge[page_no+1].length = 0;
}
-
BUG_ON(sge_no > rdma->sc_max_sge);
memset(&send_wr, 0, sizeof send_wr);
ctxt->wr_op = IB_WR_SEND;
@@ -473,20 +463,20 @@ int svc_rdma_sendto(struct svc_rqst *rqstp)
enum rpcrdma_proc reply_type;
int ret;
int inline_bytes;
- struct ib_sge *sge;
- int sge_count = 0;
struct page *res_page;
struct svc_rdma_op_ctxt *ctxt;
+ struct svc_rdma_req_map *vec;
dprintk("svcrdma: sending response for rqstp=%p\n", rqstp);
/* Get the RDMA request header. */
rdma_argp = xdr_start(&rqstp->rq_arg);
- /* Build an SGE for the XDR */
+ /* Build an req vec for the XDR */
ctxt = svc_rdma_get_context(rdma);
ctxt->direction = DMA_TO_DEVICE;
- sge = xdr_to_sge(rdma, &rqstp->rq_res, ctxt->sge, &sge_count);
+ vec = svc_rdma_get_req_map();
+ xdr_to_sge(rdma, &rqstp->rq_res, vec);
inline_bytes = rqstp->rq_res.len;
@@ -503,7 +493,7 @@ int svc_rdma_sendto(struct svc_rqst *rqstp)
/* Send any write-chunk data and build resp write-list */
ret = send_write_chunks(rdma, rdma_argp, rdma_resp,
- rqstp, sge, sge_count);
+ rqstp, vec);
if (ret < 0) {
printk(KERN_ERR "svcrdma: failed to send write chunks, rc=%d\n",
ret);
@@ -513,7 +503,7 @@ int svc_rdma_sendto(struct svc_rqst *rqstp)
/* Send any reply-list data and update resp reply-list */
ret = send_reply_chunks(rdma, rdma_argp, rdma_resp,
- rqstp, sge, sge_count);
+ rqstp, vec);
if (ret < 0) {
printk(KERN_ERR "svcrdma: failed to send reply chunks, rc=%d\n",
ret);
@@ -521,11 +511,13 @@ int svc_rdma_sendto(struct svc_rqst *rqstp)
}
inline_bytes -= ret;
- ret = send_reply(rdma, rqstp, res_page, rdma_resp, ctxt, sge_count,
+ ret = send_reply(rdma, rqstp, res_page, rdma_resp, ctxt, vec,
inline_bytes);
+ svc_rdma_put_req_map(vec);
dprintk("svcrdma: send_reply returns %d\n", ret);
return ret;
error:
+ svc_rdma_put_req_map(vec);
svc_rdma_put_context(ctxt, 0);
put_page(res_page);
return ret;
generated by cgit v1.2.3 (git 2.25.1) at 2024-12-05 02:04:26 +0000