Messages in this thread Patch in this message | | | From | Christian Schoenebeck <> | Date | Fri, 15 Jul 2022 23:32:15 +0200 | Subject | [PATCH v6 02/11] 9p/trans_virtio: turn amount of sg lists into runtime info |
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The size of scatter/gather lists used by the virtio transport is currently hard coded. Refactor this to using a runtime variable.
Signed-off-by: Christian Schoenebeck <linux_oss@crudebyte.com> --- net/9p/trans_virtio.c | 23 +++++++++++++---------- 1 file changed, 13 insertions(+), 10 deletions(-)
diff --git a/net/9p/trans_virtio.c b/net/9p/trans_virtio.c index 2693e618080c..18bdfa64b934 100644 --- a/net/9p/trans_virtio.c +++ b/net/9p/trans_virtio.c @@ -36,7 +36,7 @@ #include <linux/virtio_9p.h> #include "trans_common.h" -#define VIRTQUEUE_NUM 128 +#define VIRTQUEUE_DEFAULT_NUM 128 /* a single mutex to manage channel initialization and attachment */ static DEFINE_MUTEX(virtio_9p_lock); @@ -54,6 +54,7 @@ static atomic_t vp_pinned = ATOMIC_INIT(0); * @vc_wq: wait queue for waiting for thing to be added to ring buf * @p9_max_pages: maximum number of pinned pages * @sg: scatter gather list which is used to pack a request (protected?) + * @sg_n: amount of elements in sg array * @chan_list: linked list of channels * * We keep all per-channel information in a structure. @@ -78,6 +79,7 @@ struct virtio_chan { unsigned long p9_max_pages; /* Scatterlist: can be too big for stack. */ struct scatterlist *sg; + size_t sg_n; /** * @tag: name to identify a mount null terminated */ @@ -270,12 +272,12 @@ p9_virtio_request(struct p9_client *client, struct p9_req_t *req) 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); + chan->sg_n, 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); + chan->sg_n, req->rc.sdata, req->rc.capacity); if (in) sgs[out_sgs + in_sgs++] = chan->sg + out; @@ -447,14 +449,14 @@ p9_virtio_zc_request(struct p9_client *client, struct p9_req_t *req, /* out data */ out = pack_sg_list(chan->sg, 0, - VIRTQUEUE_NUM, req->tc.sdata, req->tc.size); + chan->sg_n, req->tc.sdata, req->tc.size); 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 += pack_sg_list_p(chan->sg, out, chan->sg_n, out_pages, out_nr_pages, offs, outlen); } @@ -466,13 +468,13 @@ p9_virtio_zc_request(struct p9_client *client, struct p9_req_t *req, * allocated memory and payload onto the user buffer. */ in = pack_sg_list(chan->sg, out, - VIRTQUEUE_NUM, req->rc.sdata, in_hdr_len); + chan->sg_n, req->rc.sdata, in_hdr_len); 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 += pack_sg_list_p(chan->sg, out + in, chan->sg_n, in_pages, in_nr_pages, offs, inlen); } @@ -574,13 +576,14 @@ static int p9_virtio_probe(struct virtio_device *vdev) goto fail; } - chan->sg = kmalloc_array(VIRTQUEUE_NUM, + chan->sg = kmalloc_array(VIRTQUEUE_DEFAULT_NUM, sizeof(struct scatterlist), GFP_KERNEL); if (!chan->sg) { pr_err("Failed to allocate virtio 9P channel\n"); err = -ENOMEM; goto out_free_chan_shallow; } + chan->sg_n = VIRTQUEUE_DEFAULT_NUM; chan->vdev = vdev; @@ -593,7 +596,7 @@ static int p9_virtio_probe(struct virtio_device *vdev) chan->vq->vdev->priv = chan; spin_lock_init(&chan->lock); - sg_init_table(chan->sg, VIRTQUEUE_NUM); + sg_init_table(chan->sg, chan->sg_n); chan->inuse = false; if (virtio_has_feature(vdev, VIRTIO_9P_MOUNT_TAG)) { @@ -777,7 +780,7 @@ static struct p9_trans_module p9_virtio_trans = { * that are not at page boundary, that can result in an extra * page in zero copy. */ - .maxsize = PAGE_SIZE * (VIRTQUEUE_NUM - 3), + .maxsize = PAGE_SIZE * (VIRTQUEUE_DEFAULT_NUM - 3), .def = 1, .owner = THIS_MODULE, }; -- 2.30.2
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