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path: root/net/sunrpc/xprtrdma/rpc_rdma.c
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Diffstat (limited to 'net/sunrpc/xprtrdma/rpc_rdma.c')
-rw-r--r--net/sunrpc/xprtrdma/rpc_rdma.c86
1 files changed, 42 insertions, 44 deletions
diff --git a/net/sunrpc/xprtrdma/rpc_rdma.c b/net/sunrpc/xprtrdma/rpc_rdma.c
index 2ac3f6e8adff..554d0814c875 100644
--- a/net/sunrpc/xprtrdma/rpc_rdma.c
+++ b/net/sunrpc/xprtrdma/rpc_rdma.c
@@ -87,6 +87,8 @@ rpcrdma_convert_iovs(struct xdr_buf *xdrbuf, unsigned int pos,
enum rpcrdma_chunktype type, struct rpcrdma_mr_seg *seg, int nsegs)
{
int len, n = 0, p;
+ int page_base;
+ struct page **ppages;
if (pos == 0 && xdrbuf->head[0].iov_len) {
seg[n].mr_page = NULL;
@@ -95,34 +97,32 @@ rpcrdma_convert_iovs(struct xdr_buf *xdrbuf, unsigned int pos,
++n;
}
- if (xdrbuf->page_len && (xdrbuf->pages[0] != NULL)) {
- if (n == nsegs)
- return 0;
- seg[n].mr_page = xdrbuf->pages[0];
- seg[n].mr_offset = (void *)(unsigned long) xdrbuf->page_base;
- seg[n].mr_len = min_t(u32,
- PAGE_SIZE - xdrbuf->page_base, xdrbuf->page_len);
- len = xdrbuf->page_len - seg[n].mr_len;
+ len = xdrbuf->page_len;
+ ppages = xdrbuf->pages + (xdrbuf->page_base >> PAGE_SHIFT);
+ page_base = xdrbuf->page_base & ~PAGE_MASK;
+ p = 0;
+ while (len && n < nsegs) {
+ seg[n].mr_page = ppages[p];
+ seg[n].mr_offset = (void *)(unsigned long) page_base;
+ seg[n].mr_len = min_t(u32, PAGE_SIZE - page_base, len);
+ BUG_ON(seg[n].mr_len > PAGE_SIZE);
+ len -= seg[n].mr_len;
++n;
- p = 1;
- while (len > 0) {
- if (n == nsegs)
- return 0;
- seg[n].mr_page = xdrbuf->pages[p];
- seg[n].mr_offset = NULL;
- seg[n].mr_len = min_t(u32, PAGE_SIZE, len);
- len -= seg[n].mr_len;
- ++n;
- ++p;
- }
+ ++p;
+ page_base = 0; /* page offset only applies to first page */
}
+ /* Message overflows the seg array */
+ if (len && n == nsegs)
+ return 0;
+
if (xdrbuf->tail[0].iov_len) {
/* the rpcrdma protocol allows us to omit any trailing
* xdr pad bytes, saving the server an RDMA operation. */
if (xdrbuf->tail[0].iov_len < 4 && xprt_rdma_pad_optimize)
return n;
if (n == nsegs)
+ /* Tail remains, but we're out of segments */
return 0;
seg[n].mr_page = NULL;
seg[n].mr_offset = xdrbuf->tail[0].iov_base;
@@ -296,6 +296,8 @@ rpcrdma_inline_pullup(struct rpc_rqst *rqst, int pad)
int copy_len;
unsigned char *srcp, *destp;
struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(rqst->rq_xprt);
+ int page_base;
+ struct page **ppages;
destp = rqst->rq_svec[0].iov_base;
curlen = rqst->rq_svec[0].iov_len;
@@ -324,28 +326,25 @@ rpcrdma_inline_pullup(struct rpc_rqst *rqst, int pad)
__func__, destp + copy_len, curlen);
rqst->rq_svec[0].iov_len += curlen;
}
-
r_xprt->rx_stats.pullup_copy_count += copy_len;
- npages = PAGE_ALIGN(rqst->rq_snd_buf.page_base+copy_len) >> PAGE_SHIFT;
+
+ page_base = rqst->rq_snd_buf.page_base;
+ ppages = rqst->rq_snd_buf.pages + (page_base >> PAGE_SHIFT);
+ page_base &= ~PAGE_MASK;
+ npages = PAGE_ALIGN(page_base+copy_len) >> PAGE_SHIFT;
for (i = 0; copy_len && i < npages; i++) {
- if (i == 0)
- curlen = PAGE_SIZE - rqst->rq_snd_buf.page_base;
- else
- curlen = PAGE_SIZE;
+ curlen = PAGE_SIZE - page_base;
if (curlen > copy_len)
curlen = copy_len;
dprintk("RPC: %s: page %d destp 0x%p len %d curlen %d\n",
__func__, i, destp, copy_len, curlen);
- srcp = kmap_atomic(rqst->rq_snd_buf.pages[i],
- KM_SKB_SUNRPC_DATA);
- if (i == 0)
- memcpy(destp, srcp+rqst->rq_snd_buf.page_base, curlen);
- else
- memcpy(destp, srcp, curlen);
+ srcp = kmap_atomic(ppages[i], KM_SKB_SUNRPC_DATA);
+ memcpy(destp, srcp+page_base, curlen);
kunmap_atomic(srcp, KM_SKB_SUNRPC_DATA);
rqst->rq_svec[0].iov_len += curlen;
destp += curlen;
copy_len -= curlen;
+ page_base = 0;
}
/* header now contains entire send message */
return pad;
@@ -606,6 +605,8 @@ rpcrdma_inline_fixup(struct rpc_rqst *rqst, char *srcp, int copy_len, int pad)
{
int i, npages, curlen, olen;
char *destp;
+ struct page **ppages;
+ int page_base;
curlen = rqst->rq_rcv_buf.head[0].iov_len;
if (curlen > copy_len) { /* write chunk header fixup */
@@ -624,32 +625,29 @@ rpcrdma_inline_fixup(struct rpc_rqst *rqst, char *srcp, int copy_len, int pad)
olen = copy_len;
i = 0;
rpcx_to_rdmax(rqst->rq_xprt)->rx_stats.fixup_copy_count += olen;
+ page_base = rqst->rq_rcv_buf.page_base;
+ ppages = rqst->rq_rcv_buf.pages + (page_base >> PAGE_SHIFT);
+ page_base &= ~PAGE_MASK;
+
if (copy_len && rqst->rq_rcv_buf.page_len) {
- npages = PAGE_ALIGN(rqst->rq_rcv_buf.page_base +
+ npages = PAGE_ALIGN(page_base +
rqst->rq_rcv_buf.page_len) >> PAGE_SHIFT;
for (; i < npages; i++) {
- if (i == 0)
- curlen = PAGE_SIZE - rqst->rq_rcv_buf.page_base;
- else
- curlen = PAGE_SIZE;
+ curlen = PAGE_SIZE - page_base;
if (curlen > copy_len)
curlen = copy_len;
dprintk("RPC: %s: page %d"
" srcp 0x%p len %d curlen %d\n",
__func__, i, srcp, copy_len, curlen);
- destp = kmap_atomic(rqst->rq_rcv_buf.pages[i],
- KM_SKB_SUNRPC_DATA);
- if (i == 0)
- memcpy(destp + rqst->rq_rcv_buf.page_base,
- srcp, curlen);
- else
- memcpy(destp, srcp, curlen);
- flush_dcache_page(rqst->rq_rcv_buf.pages[i]);
+ destp = kmap_atomic(ppages[i], KM_SKB_SUNRPC_DATA);
+ memcpy(destp + page_base, srcp, curlen);
+ flush_dcache_page(ppages[i]);
kunmap_atomic(destp, KM_SKB_SUNRPC_DATA);
srcp += curlen;
copy_len -= curlen;
if (copy_len == 0)
break;
+ page_base = 0;
}
rqst->rq_rcv_buf.page_len = olen - copy_len;
} else
generated by cgit v1.2.3 (git 2.0.4) at 2024-05-13 16:12:28 +0000