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svcrdma: Add back svc_rdma_recv_ctxt::rc_pages

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Having an nfsd thread waiting for an RDMA Read completion is
problematic if the Read responder (the client) stops responding. We
need to go back to handling RDMA Reads by allowing the nfsd thread
to return to the svc scheduler, then waking a second thread finish
the RPC message once the Read completion fires.

To start with, restore the rc_pages field so that RDMA Read pages
can be managed across calls to svc_rdma_recvfrom().

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
This commit is contained in:
Chuck Lever 2023-12-18 17:31:48 -05:00
parent fc2e69db82
commit 4d9d69db89
3 changed files with 11 additions and 2 deletions
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4
include/linux/sunrpc/svc_rdma.h
View File

@ -183,7 +183,6 @@ struct svc_rdma_recv_ctxt {
void *rc_recv_buf;
struct xdr_stream rc_stream;
u32 rc_byte_len;
unsigned int rc_page_count;
u32 rc_inv_rkey;
__be32 rc_msgtype;
@ -199,6 +198,9 @@ struct svc_rdma_recv_ctxt {
struct svc_rdma_chunk *rc_cur_result_payload;
struct svc_rdma_pcl rc_write_pcl;
struct svc_rdma_pcl rc_reply_pcl;
unsigned int rc_page_count;
struct page *rc_pages[RPCSVC_MAXPAGES];
};
struct svc_rdma_send_ctxt {

5
net/sunrpc/xprtrdma/svc_rdma_recvfrom.c
View File

@ -214,6 +214,11 @@ struct svc_rdma_recv_ctxt *svc_rdma_recv_ctxt_get(struct svcxprt_rdma *rdma)
void svc_rdma_recv_ctxt_put(struct svcxprt_rdma *rdma,
struct svc_rdma_recv_ctxt *ctxt)
{
/* @rc_page_count is normally zero here, but error flows
* can leave pages in @rc_pages.
*/
release_pages(ctxt->rc_pages, ctxt->rc_page_count);
pcl_free(&ctxt->rc_call_pcl);
pcl_free(&ctxt->rc_read_pcl);
pcl_free(&ctxt->rc_write_pcl);

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

@ -1131,7 +1131,9 @@ int svc_rdma_process_read_list(struct svcxprt_rdma *rdma,
rqstp->rq_respages = &rqstp->rq_pages[head->rc_page_count];
rqstp->rq_next_page = rqstp->rq_respages + 1;
/* Ensure svc_rdma_recv_ctxt_put() does not try to release pages */
/* Ensure svc_rdma_recv_ctxt_put() does not release pages
* left in @rc_pages while I/O proceeds.
*/
head->rc_page_count = 0;
out_err: