Reported-By: Devesh Sharma <devesh.sharma at Emulex.com> Acked-By: Devesh Sharma <Devesh.sharma at Emulex.com> > -----Original Message----- > From: linux-rdma-owner@xxxxxxxxxxxxxxx [mailto:linux-rdma- > owner@xxxxxxxxxxxxxxx] On Behalf Of Steve Wise > Sent: Thursday, July 10, 2014 12:19 AM > To: bfields@xxxxxxxxxxxx > Cc: linux-rdma@xxxxxxxxxxxxxxx; linux-nfs@xxxxxxxxxxxxxxx; tom@xxxxxx > Subject: [PATCH] svcrdma: send_write() must not overflow the device's max > sge > > Function send_write() must stop creating sges when it reaches the device > max and return the amount sent in the RDMA Write to the caller. > > Signed-off-by: Steve Wise <swise@xxxxxxxxxxxxxxxxxxxxx> > --- > > net/sunrpc/xprtrdma/svc_rdma_sendto.c | 39 +++++++++++++-------------- > ------ > 1 files changed, 15 insertions(+), 24 deletions(-) > > diff --git a/net/sunrpc/xprtrdma/svc_rdma_sendto.c > b/net/sunrpc/xprtrdma/svc_rdma_sendto.c > index 49fd21a..9f1b506 100644 > --- a/net/sunrpc/xprtrdma/svc_rdma_sendto.c > +++ b/net/sunrpc/xprtrdma/svc_rdma_sendto.c > @@ -192,6 +192,8 @@ static int send_write(struct svcxprt_rdma *xprt, struct > svc_rqst *rqstp, > xdr_sge_no++; > BUG_ON(xdr_sge_no > vec->count); > bc -= sge_bytes; > + if (sge_no == xprt->sc_max_sge) > + break; > } > > /* Prepare WRITE WR */ > @@ -209,7 +211,7 @@ static int send_write(struct svcxprt_rdma *xprt, struct > svc_rqst *rqstp, > atomic_inc(&rdma_stat_write); > if (svc_rdma_send(xprt, &write_wr)) > goto err; > - return 0; > + return write_len - bc; > err: > svc_rdma_unmap_dma(ctxt); > svc_rdma_put_context(ctxt, 0); > @@ -225,7 +227,6 @@ static int send_write_chunks(struct svcxprt_rdma > *xprt, { > u32 xfer_len = rqstp->rq_res.page_len + rqstp- > >rq_res.tail[0].iov_len; > int write_len; > - int max_write; > u32 xdr_off; > int chunk_off; > int chunk_no; > @@ -239,8 +240,6 @@ static int send_write_chunks(struct svcxprt_rdma > *xprt, > res_ary = (struct rpcrdma_write_array *) > &rdma_resp->rm_body.rm_chunks[1]; > > - max_write = xprt->sc_max_sge * PAGE_SIZE; > - > /* Write chunks start at the pagelist */ > for (xdr_off = rqstp->rq_res.head[0].iov_len, chunk_no = 0; > xfer_len && chunk_no < arg_ary->wc_nchunks; @@ -260,23 > +259,21 @@ static int send_write_chunks(struct svcxprt_rdma *xprt, > write_len); > chunk_off = 0; > while (write_len) { > - int this_write; > - this_write = min(write_len, max_write); > ret = send_write(xprt, rqstp, > ntohl(arg_ch->rs_handle), > rs_offset + chunk_off, > xdr_off, > - this_write, > + write_len, > vec); > - if (ret) { > + if (ret <= 0) { > dprintk("svcrdma: RDMA_WRITE failed, > ret=%d\n", > ret); > return -EIO; > } > - chunk_off += this_write; > - xdr_off += this_write; > - xfer_len -= this_write; > - write_len -= this_write; > + chunk_off += ret; > + xdr_off += ret; > + xfer_len -= ret; > + write_len -= ret; > } > } > /* Update the req with the number of chunks actually used */ @@ - > 293,7 +290,6 @@ static int send_reply_chunks(struct svcxprt_rdma *xprt, { > u32 xfer_len = rqstp->rq_res.len; > int write_len; > - int max_write; > u32 xdr_off; > int chunk_no; > int chunk_off; > @@ -311,8 +307,6 @@ static int send_reply_chunks(struct svcxprt_rdma > *xprt, > res_ary = (struct rpcrdma_write_array *) > &rdma_resp->rm_body.rm_chunks[2]; > > - max_write = xprt->sc_max_sge * PAGE_SIZE; > - > /* xdr offset starts at RPC message */ > nchunks = ntohl(arg_ary->wc_nchunks); > for (xdr_off = 0, chunk_no = 0; > @@ -330,24 +324,21 @@ static int send_reply_chunks(struct svcxprt_rdma > *xprt, > write_len); > chunk_off = 0; > while (write_len) { > - int this_write; > - > - this_write = min(write_len, max_write); > ret = send_write(xprt, rqstp, > ntohl(ch->rs_handle), > rs_offset + chunk_off, > xdr_off, > - this_write, > + write_len, > vec); > - if (ret) { > + if (ret <= 0) { > dprintk("svcrdma: RDMA_WRITE failed, > ret=%d\n", > ret); > return -EIO; > } > - chunk_off += this_write; > - xdr_off += this_write; > - xfer_len -= this_write; > - write_len -= this_write; > + chunk_off += ret; > + xdr_off += ret; > + xfer_len -= ret; > + write_len -= ret; > } > } > /* Update the req with the number of chunks actually used */ > > -- > To unsubscribe from this list: send the line "unsubscribe linux-rdma" in the > body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at > http://vger.kernel.org/majordomo-info.html ��.n��������+%������w��{.n�����{��w��� jg��� �����ݢj����G���� ���j:+v���w�m������w�������h�����٥
