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Merge branch 'revert-virtio_net-rx-enable-premapped-mode-by-default'

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Xuan Zhuo says:

====================
Revert "virtio_net: rx enable premapped mode by default"

Regression: http://lore.kernel.org/8b20cc28-45a9-4643-8e87-ba164a540c0a@oracle.com
====================

Link: https://patch.msgid.link/20240906123137.108741-1-xuanzhuo@linux.alibaba.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Jakub Kicinski 2024-09-10 09:01:08 -07:00
commit 48aa361c5d
1 changed files with 48 additions and 51 deletions
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99
drivers/net/virtio_net.c
View file

@ -356,6 +356,9 @@ struct receive_queue {
struct xdp_rxq_info xsk_rxq_info;
struct xdp_buff **xsk_buffs;
/* Do dma by self */
bool do_dma;
};
/* This structure can contain rss message with maximum settings for indirection table and keysize
@ -885,7 +888,7 @@ static void *virtnet_rq_get_buf(struct receive_queue *rq, u32 *len, void **ctx)
void *buf;
buf = virtqueue_get_buf_ctx(rq->vq, len, ctx);
if (buf)
if (buf && rq->do_dma)
virtnet_rq_unmap(rq, buf, *len);
return buf;
@ -898,6 +901,11 @@ static void virtnet_rq_init_one_sg(struct receive_queue *rq, void *buf, u32 len)
u32 offset;
void *head;
if (!rq->do_dma) {
sg_init_one(rq->sg, buf, len);
return;
}
head = page_address(rq->alloc_frag.page);
offset = buf - head;
@ -923,42 +931,44 @@ static void *virtnet_rq_alloc(struct receive_queue *rq, u32 size, gfp_t gfp)
head = page_address(alloc_frag->page);
dma = head;
if (rq->do_dma) {
dma = head;
/* new pages */
if (!alloc_frag->offset) {
if (rq->last_dma) {
/* Now, the new page is allocated, the last dma
* will not be used. So the dma can be unmapped
* if the ref is 0.
/* new pages */
if (!alloc_frag->offset) {
if (rq->last_dma) {
/* Now, the new page is allocated, the last dma
* will not be used. So the dma can be unmapped
* if the ref is 0.
*/
virtnet_rq_unmap(rq, rq->last_dma, 0);
rq->last_dma = NULL;
}
dma->len = alloc_frag->size - sizeof(*dma);
addr = virtqueue_dma_map_single_attrs(rq->vq, dma + 1,
dma->len, DMA_FROM_DEVICE, 0);
if (virtqueue_dma_mapping_error(rq->vq, addr))
return NULL;
dma->addr = addr;
dma->need_sync = virtqueue_dma_need_sync(rq->vq, addr);
/* Add a reference to dma to prevent the entire dma from
* being released during error handling. This reference
* will be freed after the pages are no longer used.
*/
virtnet_rq_unmap(rq, rq->last_dma, 0);
rq->last_dma = NULL;
get_page(alloc_frag->page);
dma->ref = 1;
alloc_frag->offset = sizeof(*dma);
rq->last_dma = dma;
}
dma->len = alloc_frag->size - sizeof(*dma);
addr = virtqueue_dma_map_single_attrs(rq->vq, dma + 1,
dma->len, DMA_FROM_DEVICE, 0);
if (virtqueue_dma_mapping_error(rq->vq, addr))
return NULL;
dma->addr = addr;
dma->need_sync = virtqueue_dma_need_sync(rq->vq, addr);
/* Add a reference to dma to prevent the entire dma from
* being released during error handling. This reference
* will be freed after the pages are no longer used.
*/
get_page(alloc_frag->page);
dma->ref = 1;
alloc_frag->offset = sizeof(*dma);
rq->last_dma = dma;
++dma->ref;
}
++dma->ref;
buf = head + alloc_frag->offset;
get_page(alloc_frag->page);
@ -967,19 +977,6 @@ static void *virtnet_rq_alloc(struct receive_queue *rq, u32 size, gfp_t gfp)
return buf;
}
static void virtnet_rq_set_premapped(struct virtnet_info *vi)
{
int i;
/* disable for big mode */
if (!vi->mergeable_rx_bufs && vi->big_packets)
return;
for (i = 0; i < vi->max_queue_pairs; i++)
/* error should never happen */
BUG_ON(virtqueue_set_dma_premapped(vi->rq[i].vq));
}
static void virtnet_rq_unmap_free_buf(struct virtqueue *vq, void *buf)
{
struct virtnet_info *vi = vq->vdev->priv;
@ -993,7 +990,7 @@ static void virtnet_rq_unmap_free_buf(struct virtqueue *vq, void *buf)
return;
}
if (!vi->big_packets || vi->mergeable_rx_bufs)
if (rq->do_dma)
virtnet_rq_unmap(rq, buf, 0);
virtnet_rq_free_buf(vi, rq, buf);
@ -2430,7 +2427,8 @@ static int add_recvbuf_small(struct virtnet_info *vi, struct receive_queue *rq,
err = virtqueue_add_inbuf_ctx(rq->vq, rq->sg, 1, buf, ctx, gfp);
if (err < 0) {
virtnet_rq_unmap(rq, buf, 0);
if (rq->do_dma)
virtnet_rq_unmap(rq, buf, 0);
put_page(virt_to_head_page(buf));
}
@ -2544,7 +2542,8 @@ static int add_recvbuf_mergeable(struct virtnet_info *vi,
ctx = mergeable_len_to_ctx(len + room, headroom);
err = virtqueue_add_inbuf_ctx(rq->vq, rq->sg, 1, buf, ctx, gfp);
if (err < 0) {
virtnet_rq_unmap(rq, buf, 0);
if (rq->do_dma)
virtnet_rq_unmap(rq, buf, 0);
put_page(virt_to_head_page(buf));
}
@ -2701,7 +2700,7 @@ static int virtnet_receive_packets(struct virtnet_info *vi,
}
} else {
while (packets < budget &&
(buf = virtqueue_get_buf(rq->vq, &len)) != NULL) {
(buf = virtnet_rq_get_buf(rq, &len, NULL)) != NULL) {
receive_buf(vi, rq, buf, len, NULL, xdp_xmit, stats);
packets++;
}
@ -5892,7 +5891,7 @@ static void free_receive_page_frags(struct virtnet_info *vi)
int i;
for (i = 0; i < vi->max_queue_pairs; i++)
if (vi->rq[i].alloc_frag.page) {
if (vi->rq[i].last_dma)
if (vi->rq[i].do_dma && vi->rq[i].last_dma)
virtnet_rq_unmap(&vi->rq[i], vi->rq[i].last_dma, 0);
put_page(vi->rq[i].alloc_frag.page);
}
@ -6090,8 +6089,6 @@ static int init_vqs(struct virtnet_info *vi)
if (ret)
goto err_free;
virtnet_rq_set_premapped(vi);
cpus_read_lock();
virtnet_set_affinity(vi);
cpus_read_unlock();