From 0b36f1adcb5adace6d45ca4d9a0f00860e60d012 Mon Sep 17 00:00:00 2001 From: Rusty Russell Date: Wed, 20 Mar 2013 15:44:30 +1030 Subject: 9p/trans_virtio.c: use virtio_add_sgs[] virtio_add_buf() is going away, replaced with virtio_add_sgs() which takes multiple terminated scatterlists. Cc: Eric Van Hensbergen Signed-off-by: Rusty Russell --- net/9p/trans_virtio.c | 48 +++++++++++++++++++++++++++++++++++++++--------- 1 file changed, 39 insertions(+), 9 deletions(-) (limited to 'net/9p') diff --git a/net/9p/trans_virtio.c b/net/9p/trans_virtio.c index 74dea377fe5b..568d1c9e09ad 100644 --- a/net/9p/trans_virtio.c +++ b/net/9p/trans_virtio.c @@ -194,11 +194,14 @@ static int pack_sg_list(struct scatterlist *sg, int start, if (s > count) s = count; BUG_ON(index > limit); + /* Make sure we don't terminate early. */ + sg_unmark_end(&sg[index]); sg_set_buf(&sg[index++], data, s); count -= s; data += s; } - + if (index-start) + sg_mark_end(&sg[index - 1]); return index-start; } @@ -236,12 +239,17 @@ pack_sg_list_p(struct scatterlist *sg, int start, int limit, s = rest_of_page(data); if (s > count) s = count; + /* Make sure we don't terminate early. */ + sg_unmark_end(&sg[index]); sg_set_page(&sg[index++], pdata[i++], s, data_off); data_off = 0; data += s; count -= s; nr_pages--; } + + if (index-start) + sg_mark_end(&sg[index - 1]); return index - start; } @@ -256,9 +264,10 @@ static int p9_virtio_request(struct p9_client *client, struct p9_req_t *req) { int err; - int in, out; + int in, out, out_sgs, in_sgs; unsigned long flags; struct virtio_chan *chan = client->trans; + struct scatterlist *sgs[2]; p9_debug(P9_DEBUG_TRANS, "9p debug: virtio request\n"); @@ -266,14 +275,19 @@ p9_virtio_request(struct p9_client *client, struct p9_req_t *req) req_retry: spin_lock_irqsave(&chan->lock, flags); + out_sgs = in_sgs = 0; /* Handle out VirtIO ring buffers */ out = pack_sg_list(chan->sg, 0, VIRTQUEUE_NUM, req->tc->sdata, req->tc->size); + if (out) + sgs[out_sgs++] = chan->sg; in = pack_sg_list(chan->sg, out, VIRTQUEUE_NUM, req->rc->sdata, req->rc->capacity); + if (in) + sgs[out_sgs + in_sgs++] = chan->sg + out; - err = virtqueue_add_buf(chan->vq, chan->sg, out, in, req->tc, + err = virtqueue_add_sgs(chan->vq, sgs, out_sgs, in_sgs, req->tc, GFP_ATOMIC); if (err < 0) { if (err == -ENOSPC) { @@ -289,7 +303,7 @@ req_retry: } else { spin_unlock_irqrestore(&chan->lock, flags); p9_debug(P9_DEBUG_TRANS, - "virtio rpc add_buf returned failure\n"); + "virtio rpc add_sgs returned failure\n"); return -EIO; } } @@ -351,11 +365,12 @@ p9_virtio_zc_request(struct p9_client *client, struct p9_req_t *req, char *uidata, char *uodata, int inlen, int outlen, int in_hdr_len, int kern_buf) { - int in, out, err; + int in, out, err, out_sgs, in_sgs; unsigned long flags; int in_nr_pages = 0, out_nr_pages = 0; struct page **in_pages = NULL, **out_pages = NULL; struct virtio_chan *chan = client->trans; + struct scatterlist *sgs[4]; p9_debug(P9_DEBUG_TRANS, "virtio request\n"); @@ -396,13 +411,22 @@ p9_virtio_zc_request(struct p9_client *client, struct p9_req_t *req, req->status = REQ_STATUS_SENT; req_retry_pinned: spin_lock_irqsave(&chan->lock, flags); + + out_sgs = in_sgs = 0; + /* out data */ out = pack_sg_list(chan->sg, 0, VIRTQUEUE_NUM, req->tc->sdata, req->tc->size); - if (out_pages) + if (out) + sgs[out_sgs++] = chan->sg; + + if (out_pages) { + sgs[out_sgs++] = chan->sg + out; out += pack_sg_list_p(chan->sg, out, VIRTQUEUE_NUM, out_pages, out_nr_pages, uodata, outlen); + } + /* * Take care of in data * For example TREAD have 11. @@ -412,11 +436,17 @@ req_retry_pinned: */ in = pack_sg_list(chan->sg, out, VIRTQUEUE_NUM, req->rc->sdata, in_hdr_len); - if (in_pages) + if (in) + sgs[out_sgs + in_sgs++] = chan->sg + out; + + if (in_pages) { + sgs[out_sgs + in_sgs++] = chan->sg + out + in; in += pack_sg_list_p(chan->sg, out + in, VIRTQUEUE_NUM, in_pages, in_nr_pages, uidata, inlen); + } - err = virtqueue_add_buf(chan->vq, chan->sg, out, in, req->tc, + BUG_ON(out_sgs + in_sgs > ARRAY_SIZE(sgs)); + err = virtqueue_add_sgs(chan->vq, sgs, out_sgs, in_sgs, req->tc, GFP_ATOMIC); if (err < 0) { if (err == -ENOSPC) { @@ -432,7 +462,7 @@ req_retry_pinned: } else { spin_unlock_irqrestore(&chan->lock, flags); p9_debug(P9_DEBUG_TRANS, - "virtio rpc add_buf returned failure\n"); + "virtio rpc add_sgs returned failure\n"); err = -EIO; goto err_out; } -- cgit