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| author | Chuck Lever <chuck.lever@oracle.com> | 2023-06-12 10:10:07 -0400 |
|---|---|---|
| committer | Chuck Lever <chuck.lever@oracle.com> | 2023-06-12 12:16:36 -0400 |
| commit | a944209c11aff9a5c9b7987fc958cc2344dca51f (patch) | |
| tree | ecc593f9a130cdae75cad400a06c490ed3e35491 | |
| parent | 6be7afcd92cd426428b94dd7e258b2472a45cde7 (diff) | |
| download | lwn-a944209c11aff9a5c9b7987fc958cc2344dca51f.tar.gz lwn-a944209c11aff9a5c9b7987fc958cc2344dca51f.zip | |
SUNRPC: Revert 579900670ac7 ("svcrdma: Remove unused sc_pages field")
Pre-requisite for releasing pages in the send completion handler.
Reverted by hand: patch -R would not apply cleanly.
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
| -rw-r--r-- | include/linux/sunrpc/svc_rdma.h | 3 | ||||
| -rw-r--r-- | net/sunrpc/xprtrdma/svc_rdma_sendto.c | 25 |
2 files changed, 27 insertions, 1 deletions
diff --git a/include/linux/sunrpc/svc_rdma.h b/include/linux/sunrpc/svc_rdma.h index a0f3ea357977..8e654da55170 100644 --- a/include/linux/sunrpc/svc_rdma.h +++ b/include/linux/sunrpc/svc_rdma.h @@ -158,8 +158,9 @@ struct svc_rdma_send_ctxt { struct xdr_buf sc_hdrbuf; struct xdr_stream sc_stream; void *sc_xprt_buf; + int sc_page_count; int sc_cur_sge_no; - + struct page *sc_pages[RPCSVC_MAXPAGES]; struct ib_sge sc_sges[]; }; diff --git a/net/sunrpc/xprtrdma/svc_rdma_sendto.c b/net/sunrpc/xprtrdma/svc_rdma_sendto.c index 8e7ccef74207..4c62bc41ea40 100644 --- a/net/sunrpc/xprtrdma/svc_rdma_sendto.c +++ b/net/sunrpc/xprtrdma/svc_rdma_sendto.c @@ -213,6 +213,7 @@ out: ctxt->sc_send_wr.num_sge = 0; ctxt->sc_cur_sge_no = 0; + ctxt->sc_page_count = 0; return ctxt; out_empty: @@ -227,6 +228,8 @@ out_empty: * svc_rdma_send_ctxt_put - Return send_ctxt to free list * @rdma: controlling svcxprt_rdma * @ctxt: object to return to the free list + * + * Pages left in sc_pages are DMA unmapped and released. */ void svc_rdma_send_ctxt_put(struct svcxprt_rdma *rdma, struct svc_rdma_send_ctxt *ctxt) @@ -234,6 +237,9 @@ void svc_rdma_send_ctxt_put(struct svcxprt_rdma *rdma, struct ib_device *device = rdma->sc_cm_id->device; unsigned int i; + for (i = 0; i < ctxt->sc_page_count; ++i) + put_page(ctxt->sc_pages[i]); + /* The first SGE contains the transport header, which * remains mapped until @ctxt is destroyed. */ @@ -798,6 +804,25 @@ int svc_rdma_map_reply_msg(struct svcxprt_rdma *rdma, svc_rdma_xb_dma_map, &args); } +/* The svc_rqst and all resources it owns are released as soon as + * svc_rdma_sendto returns. Transfer pages under I/O to the ctxt + * so they are released by the Send completion handler. + */ +static inline void svc_rdma_save_io_pages(struct svc_rqst *rqstp, + struct svc_rdma_send_ctxt *ctxt) +{ + int i, pages = rqstp->rq_next_page - rqstp->rq_respages; + + ctxt->sc_page_count += pages; + for (i = 0; i < pages; i++) { + ctxt->sc_pages[i] = rqstp->rq_respages[i]; + rqstp->rq_respages[i] = NULL; + } + + /* Prevent svc_xprt_release from releasing pages in rq_pages */ + rqstp->rq_next_page = rqstp->rq_respages; +} + /* Prepare the portion of the RPC Reply that will be transmitted * via RDMA Send. The RPC-over-RDMA transport header is prepared * in sc_sges[0], and the RPC xdr_buf is prepared in following sges. |