Jason Wang
2023-Mar-07 06:43 UTC
[PATCH vhost v1 03/12] virtio_ring: split: introduce virtqueue_add_split_premapped()
On Thu, Mar 2, 2023 at 7:59?PM Xuan Zhuo <xuanzhuo at linux.alibaba.com> wrote:> > virtqueue_add_split() only supports virtual addresses, dma is completed > in virtqueue_add_split(). > > In some scenarios (such as the AF_XDP scenario), the memory is allocated > and DMA is completed in advance, so it is necessary for us to support > passing the DMA address to virtio core. > > Signed-off-by: Xuan Zhuo <xuanzhuo at linux.alibaba.com> > --- > drivers/virtio/virtio_ring.c | 74 +++++++++++++++++++++++++++++++----- > include/linux/virtio.h | 5 +++ > 2 files changed, 69 insertions(+), 10 deletions(-) > > diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c > index 17520f0d7649..5b186ce73d35 100644 > --- a/drivers/virtio/virtio_ring.c > +++ b/drivers/virtio/virtio_ring.c > @@ -70,6 +70,7 @@ > struct vring_desc_state_split { > void *data; /* Data for callback. */ > struct vring_desc *indir_desc; /* Indirect descriptor, if any. */ > + bool dma_map; /* Addr is mapped by virtio core or not. */This will stress the cache, can we pack the boolean into indir_desc?> }; > > struct vring_desc_state_packed { > @@ -440,7 +441,7 @@ static void vring_unmap_one_split_indirect(const struct vring_virtqueue *vq, > } > > static unsigned int vring_unmap_one_split(const struct vring_virtqueue *vq, > - unsigned int i) > + unsigned int i, bool dma_map) > { > struct vring_desc_extra *extra = vq->split.desc_extra; > u16 flags; > @@ -457,6 +458,9 @@ static unsigned int vring_unmap_one_split(const struct vring_virtqueue *vq, > (flags & VRING_DESC_F_WRITE) ? > DMA_FROM_DEVICE : DMA_TO_DEVICE); > } else { > + if (!dma_map) > + goto out; > + > dma_unmap_page(vring_dma_dev(vq), > extra[i].addr, > extra[i].len, > @@ -751,6 +755,7 @@ static inline int virtqueue_add_split(struct virtqueue *_vq, > unsigned int in_sgs, > void *data, > void *ctx, > + bool dma_map, > gfp_t gfp) > { > struct vring_virtqueue *vq = to_vvq(_vq); > @@ -767,9 +772,11 @@ static inline int virtqueue_add_split(struct virtqueue *_vq, > goto end; > } > > - err = virtqueue_map_sgs(vq, sgs, total_sg, out_sgs, in_sgs); > - if (err) > - goto err; > + if (dma_map) {Could we simply check sg->dma_addr in this case? Then we don't need to introduce the dma_map flag. Thanks> + err = virtqueue_map_sgs(vq, sgs, total_sg, out_sgs, in_sgs); > + if (err) > + goto err; > + } > > head = vq->free_head; > err = virtqueue_add_vring_split(vq, sgs, total_sg, out_sgs, in_sgs, desc); > @@ -779,11 +786,13 @@ static inline int virtqueue_add_split(struct virtqueue *_vq, > /* Store token and indirect buffer state. */ > vq->split.desc_state[head].data = data; > vq->split.desc_state[head].indir_desc = desc ? desc : ctx; > + vq->split.desc_state[head].dma_map = dma_map; > > goto end; > > err: > - virtqueue_unmap_sgs(vq, sgs, total_sg, out_sgs, in_sgs); > + if (dma_map) > + virtqueue_unmap_sgs(vq, sgs, total_sg, out_sgs, in_sgs); > > kfree(desc); > > @@ -828,20 +837,23 @@ static void detach_buf_split(struct vring_virtqueue *vq, unsigned int head, > { > unsigned int i, j; > __virtio16 nextflag = cpu_to_virtio16(vq->vq.vdev, VRING_DESC_F_NEXT); > + bool dma_map; > > /* Clear data ptr. */ > vq->split.desc_state[head].data = NULL; > > + dma_map = vq->split.desc_state[head].dma_map; > + > /* Put back on free list: unmap first-level descriptors and find end */ > i = head; > > while (vq->split.vring.desc[i].flags & nextflag) { > - vring_unmap_one_split(vq, i); > + vring_unmap_one_split(vq, i, dma_map); > i = vq->split.desc_extra[i].next; > vq->vq.num_free++; > } > > - vring_unmap_one_split(vq, i); > + vring_unmap_one_split(vq, i, dma_map); > vq->split.desc_extra[i].next = vq->free_head; > vq->free_head = head; > > @@ -863,8 +875,10 @@ static void detach_buf_split(struct vring_virtqueue *vq, unsigned int head, > VRING_DESC_F_INDIRECT)); > BUG_ON(len == 0 || len % sizeof(struct vring_desc)); > > - for (j = 0; j < len / sizeof(struct vring_desc); j++) > - vring_unmap_one_split_indirect(vq, &indir_desc[j]); > + if (dma_map) { > + for (j = 0; j < len / sizeof(struct vring_desc); j++) > + vring_unmap_one_split_indirect(vq, &indir_desc[j]); > + } > > kfree(indir_desc); > vq->split.desc_state[head].indir_desc = NULL; > @@ -2204,7 +2218,22 @@ static inline int virtqueue_add(struct virtqueue *_vq, > return vq->packed_ring ? virtqueue_add_packed(_vq, sgs, total_sg, > out_sgs, in_sgs, data, ctx, gfp) : > virtqueue_add_split(_vq, sgs, total_sg, > - out_sgs, in_sgs, data, ctx, gfp); > + out_sgs, in_sgs, data, ctx, true, gfp); > +} > + > +static inline int virtqueue_add_premapped(struct virtqueue *_vq, > + struct scatterlist *sgs[], > + unsigned int total_sg, > + unsigned int out_sgs, > + unsigned int in_sgs, > + void *data, > + void *ctx, > + gfp_t gfp) > +{ > + struct vring_virtqueue *vq = to_vvq(_vq); > + > + return virtqueue_add_split(_vq, sgs, total_sg, out_sgs, in_sgs, data, > + ctx, false, gfp); > } > > /** > @@ -2264,6 +2293,31 @@ int virtqueue_add_outbuf(struct virtqueue *vq, > } > EXPORT_SYMBOL_GPL(virtqueue_add_outbuf); > > +/** > + * virtqueue_add_outbuf_premapped - expose output buffers with dma address to other end > + * @vq: the struct virtqueue we're talking about. > + * @sg: scatterlist (must be well-formed and terminated!) > + * @num: the number of entries in @sg readable by other side > + * @data: the token identifying the buffer. > + * @gfp: how to do memory allocations (if necessary). > + * > + * Caller must ensure we don't call this with other virtqueue operations > + * at the same time (except where noted). > + * > + * It is required that all addrs have completed DMA operations. And use > + * sg->dma_address, sg->length to pass addr and length. > + * > + * Returns zero or a negative error (ie. ENOSPC, ENOMEM, EIO). > + */ > +int virtqueue_add_outbuf_premapped(struct virtqueue *vq, > + struct scatterlist *sg, unsigned int num, > + void *data, > + gfp_t gfp) > +{ > + return virtqueue_add_premapped(vq, &sg, num, 1, 0, data, NULL, gfp); > +} > +EXPORT_SYMBOL_GPL(virtqueue_add_outbuf_premapped); > + > /** > * virtqueue_add_inbuf - expose input buffers to other end > * @vq: the struct virtqueue we're talking about. > diff --git a/include/linux/virtio.h b/include/linux/virtio.h > index dcab9c7e8784..d8b472a7dcae 100644 > --- a/include/linux/virtio.h > +++ b/include/linux/virtio.h > @@ -43,6 +43,11 @@ int virtqueue_add_outbuf(struct virtqueue *vq, > void *data, > gfp_t gfp); > > +int virtqueue_add_outbuf_premapped(struct virtqueue *vq, > + struct scatterlist *sg, unsigned int num, > + void *data, > + gfp_t gfp); > + > int virtqueue_add_inbuf(struct virtqueue *vq, > struct scatterlist sg[], unsigned int num, > void *data, > -- > 2.32.0.3.g01195cf9f >
Xuan Zhuo
2023-Mar-07 06:55 UTC
[PATCH vhost v1 03/12] virtio_ring: split: introduce virtqueue_add_split_premapped()
On Tue, 7 Mar 2023 14:43:42 +0800, Jason Wang <jasowang at redhat.com> wrote:> On Thu, Mar 2, 2023 at 7:59?PM Xuan Zhuo <xuanzhuo at linux.alibaba.com> wrote: > > > > virtqueue_add_split() only supports virtual addresses, dma is completed > > in virtqueue_add_split(). > > > > In some scenarios (such as the AF_XDP scenario), the memory is allocated > > and DMA is completed in advance, so it is necessary for us to support > > passing the DMA address to virtio core. > > > > Signed-off-by: Xuan Zhuo <xuanzhuo at linux.alibaba.com> > > --- > > drivers/virtio/virtio_ring.c | 74 +++++++++++++++++++++++++++++++----- > > include/linux/virtio.h | 5 +++ > > 2 files changed, 69 insertions(+), 10 deletions(-) > > > > diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c > > index 17520f0d7649..5b186ce73d35 100644 > > --- a/drivers/virtio/virtio_ring.c > > +++ b/drivers/virtio/virtio_ring.c > > @@ -70,6 +70,7 @@ > > struct vring_desc_state_split { > > void *data; /* Data for callback. */ > > struct vring_desc *indir_desc; /* Indirect descriptor, if any. */ > > + bool dma_map; /* Addr is mapped by virtio core or not. */ > > This will stress the cache, can we pack the boolean into indir_desc?I will try this. This is a good idea.> > > }; > > > > struct vring_desc_state_packed { > > @@ -440,7 +441,7 @@ static void vring_unmap_one_split_indirect(const struct vring_virtqueue *vq, > > } > > > > static unsigned int vring_unmap_one_split(const struct vring_virtqueue *vq, > > - unsigned int i) > > + unsigned int i, bool dma_map) > > { > > struct vring_desc_extra *extra = vq->split.desc_extra; > > u16 flags; > > @@ -457,6 +458,9 @@ static unsigned int vring_unmap_one_split(const struct vring_virtqueue *vq, > > (flags & VRING_DESC_F_WRITE) ? > > DMA_FROM_DEVICE : DMA_TO_DEVICE); > > } else { > > + if (!dma_map) > > + goto out; > > + > > dma_unmap_page(vring_dma_dev(vq), > > extra[i].addr, > > extra[i].len, > > @@ -751,6 +755,7 @@ static inline int virtqueue_add_split(struct virtqueue *_vq, > > unsigned int in_sgs, > > void *data, > > void *ctx, > > + bool dma_map, > > gfp_t gfp) > > { > > struct vring_virtqueue *vq = to_vvq(_vq); > > @@ -767,9 +772,11 @@ static inline int virtqueue_add_split(struct virtqueue *_vq, > > goto end; > > } > > > > - err = virtqueue_map_sgs(vq, sgs, total_sg, out_sgs, in_sgs); > > - if (err) > > - goto err; > > + if (dma_map) { > > Could we simply check sg->dma_addr in this case? Then we don't need to > introduce the dma_map flag.Yes. We can. Thanks.> > Thanks > > > > + err = virtqueue_map_sgs(vq, sgs, total_sg, out_sgs, in_sgs); > > + if (err) > > + goto err; > > + } > > > > head = vq->free_head; > > err = virtqueue_add_vring_split(vq, sgs, total_sg, out_sgs, in_sgs, desc); > > @@ -779,11 +786,13 @@ static inline int virtqueue_add_split(struct virtqueue *_vq, > > /* Store token and indirect buffer state. */ > > vq->split.desc_state[head].data = data; > > vq->split.desc_state[head].indir_desc = desc ? desc : ctx; > > + vq->split.desc_state[head].dma_map = dma_map; > > > > goto end; > > > > err: > > - virtqueue_unmap_sgs(vq, sgs, total_sg, out_sgs, in_sgs); > > + if (dma_map) > > + virtqueue_unmap_sgs(vq, sgs, total_sg, out_sgs, in_sgs); > > > > kfree(desc); > > > > @@ -828,20 +837,23 @@ static void detach_buf_split(struct vring_virtqueue *vq, unsigned int head, > > { > > unsigned int i, j; > > __virtio16 nextflag = cpu_to_virtio16(vq->vq.vdev, VRING_DESC_F_NEXT); > > + bool dma_map; > > > > /* Clear data ptr. */ > > vq->split.desc_state[head].data = NULL; > > > > + dma_map = vq->split.desc_state[head].dma_map; > > + > > /* Put back on free list: unmap first-level descriptors and find end */ > > i = head; > > > > while (vq->split.vring.desc[i].flags & nextflag) { > > - vring_unmap_one_split(vq, i); > > + vring_unmap_one_split(vq, i, dma_map); > > i = vq->split.desc_extra[i].next; > > vq->vq.num_free++; > > } > > > > - vring_unmap_one_split(vq, i); > > + vring_unmap_one_split(vq, i, dma_map); > > vq->split.desc_extra[i].next = vq->free_head; > > vq->free_head = head; > > > > @@ -863,8 +875,10 @@ static void detach_buf_split(struct vring_virtqueue *vq, unsigned int head, > > VRING_DESC_F_INDIRECT)); > > BUG_ON(len == 0 || len % sizeof(struct vring_desc)); > > > > - for (j = 0; j < len / sizeof(struct vring_desc); j++) > > - vring_unmap_one_split_indirect(vq, &indir_desc[j]); > > + if (dma_map) { > > + for (j = 0; j < len / sizeof(struct vring_desc); j++) > > + vring_unmap_one_split_indirect(vq, &indir_desc[j]); > > + } > > > > kfree(indir_desc); > > vq->split.desc_state[head].indir_desc = NULL; > > @@ -2204,7 +2218,22 @@ static inline int virtqueue_add(struct virtqueue *_vq, > > return vq->packed_ring ? virtqueue_add_packed(_vq, sgs, total_sg, > > out_sgs, in_sgs, data, ctx, gfp) : > > virtqueue_add_split(_vq, sgs, total_sg, > > - out_sgs, in_sgs, data, ctx, gfp); > > + out_sgs, in_sgs, data, ctx, true, gfp); > > +} > > + > > +static inline int virtqueue_add_premapped(struct virtqueue *_vq, > > + struct scatterlist *sgs[], > > + unsigned int total_sg, > > + unsigned int out_sgs, > > + unsigned int in_sgs, > > + void *data, > > + void *ctx, > > + gfp_t gfp) > > +{ > > + struct vring_virtqueue *vq = to_vvq(_vq); > > + > > + return virtqueue_add_split(_vq, sgs, total_sg, out_sgs, in_sgs, data, > > + ctx, false, gfp); > > } > > > > /** > > @@ -2264,6 +2293,31 @@ int virtqueue_add_outbuf(struct virtqueue *vq, > > } > > EXPORT_SYMBOL_GPL(virtqueue_add_outbuf); > > > > +/** > > + * virtqueue_add_outbuf_premapped - expose output buffers with dma address to other end > > + * @vq: the struct virtqueue we're talking about. > > + * @sg: scatterlist (must be well-formed and terminated!) > > + * @num: the number of entries in @sg readable by other side > > + * @data: the token identifying the buffer. > > + * @gfp: how to do memory allocations (if necessary). > > + * > > + * Caller must ensure we don't call this with other virtqueue operations > > + * at the same time (except where noted). > > + * > > + * It is required that all addrs have completed DMA operations. And use > > + * sg->dma_address, sg->length to pass addr and length. > > + * > > + * Returns zero or a negative error (ie. ENOSPC, ENOMEM, EIO). > > + */ > > +int virtqueue_add_outbuf_premapped(struct virtqueue *vq, > > + struct scatterlist *sg, unsigned int num, > > + void *data, > > + gfp_t gfp) > > +{ > > + return virtqueue_add_premapped(vq, &sg, num, 1, 0, data, NULL, gfp); > > +} > > +EXPORT_SYMBOL_GPL(virtqueue_add_outbuf_premapped); > > + > > /** > > * virtqueue_add_inbuf - expose input buffers to other end > > * @vq: the struct virtqueue we're talking about. > > diff --git a/include/linux/virtio.h b/include/linux/virtio.h > > index dcab9c7e8784..d8b472a7dcae 100644 > > --- a/include/linux/virtio.h > > +++ b/include/linux/virtio.h > > @@ -43,6 +43,11 @@ int virtqueue_add_outbuf(struct virtqueue *vq, > > void *data, > > gfp_t gfp); > > > > +int virtqueue_add_outbuf_premapped(struct virtqueue *vq, > > + struct scatterlist *sg, unsigned int num, > > + void *data, > > + gfp_t gfp); > > + > > int virtqueue_add_inbuf(struct virtqueue *vq, > > struct scatterlist sg[], unsigned int num, > > void *data, > > -- > > 2.32.0.3.g01195cf9f > > >
Xuan Zhuo
2023-Mar-07 07:39 UTC
[PATCH vhost v1 03/12] virtio_ring: split: introduce virtqueue_add_split_premapped()
On Tue, 7 Mar 2023 14:43:42 +0800, Jason Wang <jasowang at redhat.com> wrote:> On Thu, Mar 2, 2023 at 7:59?PM Xuan Zhuo <xuanzhuo at linux.alibaba.com> wrote: > > > > virtqueue_add_split() only supports virtual addresses, dma is completed > > in virtqueue_add_split(). > > > > In some scenarios (such as the AF_XDP scenario), the memory is allocated > > and DMA is completed in advance, so it is necessary for us to support > > passing the DMA address to virtio core. > > > > Signed-off-by: Xuan Zhuo <xuanzhuo at linux.alibaba.com> > > --- > > drivers/virtio/virtio_ring.c | 74 +++++++++++++++++++++++++++++++----- > > include/linux/virtio.h | 5 +++ > > 2 files changed, 69 insertions(+), 10 deletions(-) > > > > diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c > > index 17520f0d7649..5b186ce73d35 100644 > > --- a/drivers/virtio/virtio_ring.c > > +++ b/drivers/virtio/virtio_ring.c > > @@ -70,6 +70,7 @@ > > struct vring_desc_state_split { > > void *data; /* Data for callback. */ > > struct vring_desc *indir_desc; /* Indirect descriptor, if any. */ > > + bool dma_map; /* Addr is mapped by virtio core or not. */ > > This will stress the cache, can we pack the boolean into indir_desc?Rethink about this, I think we cannot pack this into indir_desc. Because we may save ctx to indir_desc. We can save this info to vring_desc_extra.addr, null means not dma mapped by virtio core. Thanks.> > > }; > > > > struct vring_desc_state_packed { > > @@ -440,7 +441,7 @@ static void vring_unmap_one_split_indirect(const struct vring_virtqueue *vq, > > } > > > > static unsigned int vring_unmap_one_split(const struct vring_virtqueue *vq, > > - unsigned int i) > > + unsigned int i, bool dma_map) > > { > > struct vring_desc_extra *extra = vq->split.desc_extra; > > u16 flags; > > @@ -457,6 +458,9 @@ static unsigned int vring_unmap_one_split(const struct vring_virtqueue *vq, > > (flags & VRING_DESC_F_WRITE) ? > > DMA_FROM_DEVICE : DMA_TO_DEVICE); > > } else { > > + if (!dma_map) > > + goto out; > > + > > dma_unmap_page(vring_dma_dev(vq), > > extra[i].addr, > > extra[i].len, > > @@ -751,6 +755,7 @@ static inline int virtqueue_add_split(struct virtqueue *_vq, > > unsigned int in_sgs, > > void *data, > > void *ctx, > > + bool dma_map, > > gfp_t gfp) > > { > > struct vring_virtqueue *vq = to_vvq(_vq); > > @@ -767,9 +772,11 @@ static inline int virtqueue_add_split(struct virtqueue *_vq, > > goto end; > > } > > > > - err = virtqueue_map_sgs(vq, sgs, total_sg, out_sgs, in_sgs); > > - if (err) > > - goto err; > > + if (dma_map) { > > Could we simply check sg->dma_addr in this case? Then we don't need to > introduce the dma_map flag. > > Thanks > > > > + err = virtqueue_map_sgs(vq, sgs, total_sg, out_sgs, in_sgs); > > + if (err) > > + goto err; > > + } > > > > head = vq->free_head; > > err = virtqueue_add_vring_split(vq, sgs, total_sg, out_sgs, in_sgs, desc); > > @@ -779,11 +786,13 @@ static inline int virtqueue_add_split(struct virtqueue *_vq, > > /* Store token and indirect buffer state. */ > > vq->split.desc_state[head].data = data; > > vq->split.desc_state[head].indir_desc = desc ? desc : ctx; > > + vq->split.desc_state[head].dma_map = dma_map; > > > > goto end; > > > > err: > > - virtqueue_unmap_sgs(vq, sgs, total_sg, out_sgs, in_sgs); > > + if (dma_map) > > + virtqueue_unmap_sgs(vq, sgs, total_sg, out_sgs, in_sgs); > > > > kfree(desc); > > > > @@ -828,20 +837,23 @@ static void detach_buf_split(struct vring_virtqueue *vq, unsigned int head, > > { > > unsigned int i, j; > > __virtio16 nextflag = cpu_to_virtio16(vq->vq.vdev, VRING_DESC_F_NEXT); > > + bool dma_map; > > > > /* Clear data ptr. */ > > vq->split.desc_state[head].data = NULL; > > > > + dma_map = vq->split.desc_state[head].dma_map; > > + > > /* Put back on free list: unmap first-level descriptors and find end */ > > i = head; > > > > while (vq->split.vring.desc[i].flags & nextflag) { > > - vring_unmap_one_split(vq, i); > > + vring_unmap_one_split(vq, i, dma_map); > > i = vq->split.desc_extra[i].next; > > vq->vq.num_free++; > > } > > > > - vring_unmap_one_split(vq, i); > > + vring_unmap_one_split(vq, i, dma_map); > > vq->split.desc_extra[i].next = vq->free_head; > > vq->free_head = head; > > > > @@ -863,8 +875,10 @@ static void detach_buf_split(struct vring_virtqueue *vq, unsigned int head, > > VRING_DESC_F_INDIRECT)); > > BUG_ON(len == 0 || len % sizeof(struct vring_desc)); > > > > - for (j = 0; j < len / sizeof(struct vring_desc); j++) > > - vring_unmap_one_split_indirect(vq, &indir_desc[j]); > > + if (dma_map) { > > + for (j = 0; j < len / sizeof(struct vring_desc); j++) > > + vring_unmap_one_split_indirect(vq, &indir_desc[j]); > > + } > > > > kfree(indir_desc); > > vq->split.desc_state[head].indir_desc = NULL; > > @@ -2204,7 +2218,22 @@ static inline int virtqueue_add(struct virtqueue *_vq, > > return vq->packed_ring ? virtqueue_add_packed(_vq, sgs, total_sg, > > out_sgs, in_sgs, data, ctx, gfp) : > > virtqueue_add_split(_vq, sgs, total_sg, > > - out_sgs, in_sgs, data, ctx, gfp); > > + out_sgs, in_sgs, data, ctx, true, gfp); > > +} > > + > > +static inline int virtqueue_add_premapped(struct virtqueue *_vq, > > + struct scatterlist *sgs[], > > + unsigned int total_sg, > > + unsigned int out_sgs, > > + unsigned int in_sgs, > > + void *data, > > + void *ctx, > > + gfp_t gfp) > > +{ > > + struct vring_virtqueue *vq = to_vvq(_vq); > > + > > + return virtqueue_add_split(_vq, sgs, total_sg, out_sgs, in_sgs, data, > > + ctx, false, gfp); > > } > > > > /** > > @@ -2264,6 +2293,31 @@ int virtqueue_add_outbuf(struct virtqueue *vq, > > } > > EXPORT_SYMBOL_GPL(virtqueue_add_outbuf); > > > > +/** > > + * virtqueue_add_outbuf_premapped - expose output buffers with dma address to other end > > + * @vq: the struct virtqueue we're talking about. > > + * @sg: scatterlist (must be well-formed and terminated!) > > + * @num: the number of entries in @sg readable by other side > > + * @data: the token identifying the buffer. > > + * @gfp: how to do memory allocations (if necessary). > > + * > > + * Caller must ensure we don't call this with other virtqueue operations > > + * at the same time (except where noted). > > + * > > + * It is required that all addrs have completed DMA operations. And use > > + * sg->dma_address, sg->length to pass addr and length. > > + * > > + * Returns zero or a negative error (ie. ENOSPC, ENOMEM, EIO). > > + */ > > +int virtqueue_add_outbuf_premapped(struct virtqueue *vq, > > + struct scatterlist *sg, unsigned int num, > > + void *data, > > + gfp_t gfp) > > +{ > > + return virtqueue_add_premapped(vq, &sg, num, 1, 0, data, NULL, gfp); > > +} > > +EXPORT_SYMBOL_GPL(virtqueue_add_outbuf_premapped); > > + > > /** > > * virtqueue_add_inbuf - expose input buffers to other end > > * @vq: the struct virtqueue we're talking about. > > diff --git a/include/linux/virtio.h b/include/linux/virtio.h > > index dcab9c7e8784..d8b472a7dcae 100644 > > --- a/include/linux/virtio.h > > +++ b/include/linux/virtio.h > > @@ -43,6 +43,11 @@ int virtqueue_add_outbuf(struct virtqueue *vq, > > void *data, > > gfp_t gfp); > > > > +int virtqueue_add_outbuf_premapped(struct virtqueue *vq, > > + struct scatterlist *sg, unsigned int num, > > + void *data, > > + gfp_t gfp); > > + > > int virtqueue_add_inbuf(struct virtqueue *vq, > > struct scatterlist sg[], unsigned int num, > > void *data, > > -- > > 2.32.0.3.g01195cf9f > > >
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