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svcrdma: Adjust the number of entries in svc_rdma_recv_ctxt::rc_pages

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Allow allocation of more entries in the rc_pages[] array when the
maximum size of an RPC message is increased.

Reviewed-by: Jeff Layton <jlayton@kernel.org>
Reviewed-by: NeilBrown <neil@brown.name>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
This commit is contained in:
Chuck Lever 2025-04-28 15:36:56 -04:00
parent f4126823c1
commit 81381d1a90
2 changed files with 8 additions and 3 deletions
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3
include/linux/sunrpc/svc_rdma.h
View File

@ -202,7 +202,8 @@ struct svc_rdma_recv_ctxt {
struct svc_rdma_pcl rc_reply_pcl;
unsigned int rc_page_count;
struct page *rc_pages[RPCSVC_MAXPAGES];
unsigned long rc_maxpages;
struct page *rc_pages[] __counted_by(rc_maxpages);
};
/*

8
net/sunrpc/xprtrdma/svc_rdma_recvfrom.c
View File

@ -120,12 +120,16 @@ svc_rdma_recv_ctxt_alloc(struct svcxprt_rdma *rdma)
{
int node = ibdev_to_node(rdma->sc_cm_id->device);
struct svc_rdma_recv_ctxt *ctxt;
unsigned long pages;
dma_addr_t addr;
void *buffer;
ctxt = kzalloc_node(sizeof(*ctxt), GFP_KERNEL, node);
pages = svc_serv_maxpages(rdma->sc_xprt.xpt_server);
ctxt = kzalloc_node(struct_size(ctxt, rc_pages, pages),
GFP_KERNEL, node);
if (!ctxt)
goto fail0;
ctxt->rc_maxpages = pages;
buffer = kmalloc_node(rdma->sc_max_req_size, GFP_KERNEL, node);
if (!buffer)
goto fail1;
@ -497,7 +501,7 @@ static bool xdr_check_write_chunk(struct svc_rdma_recv_ctxt *rctxt)
* a computation, perform a simple range check. This is an
* arbitrary but sensible limit (ie, not architectural).
*/
if (unlikely(segcount > RPCSVC_MAXPAGES))
if (unlikely(segcount > rctxt->rc_maxpages))
return false;
p = xdr_inline_decode(&rctxt->rc_stream,