search for: vring_virtqueue

...vers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c index a26fab91c59f..4c3bb0ddeb9b 100644 --- a/drivers/virtio/virtio_ring.c +++ b/drivers/virtio/virtio_ring.c @@ -231,9 +231,9 @@ static void vring_free(struct virtqueue *_vq); * Helpers. */ -#define to_vvq(_vq) container_of(_vq, struct vring_virtqueue, vq) +#define to_vvq(_vq) container_of_const(_vq, struct vring_virtqueue, vq) -static bool virtqueue_use_indirect(struct vring_virtqueue *vq, +static bool virtqueue_use_indirect(const struct vring_virtqueue *vq, unsigned int total_sg) { /* @@ -269,7 +269,7 @@ static bool virtqueue_use_...

...vers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c index a26fab91c59f..4c3bb0ddeb9b 100644 --- a/drivers/virtio/virtio_ring.c +++ b/drivers/virtio/virtio_ring.c @@ -231,9 +231,9 @@ static void vring_free(struct virtqueue *_vq); * Helpers. */ -#define to_vvq(_vq) container_of(_vq, struct vring_virtqueue, vq) +#define to_vvq(_vq) container_of_const(_vq, struct vring_virtqueue, vq) -static bool virtqueue_use_indirect(struct vring_virtqueue *vq, +static bool virtqueue_use_indirect(const struct vring_virtqueue *vq, unsigned int total_sg) { /* @@ -269,7 +269,7 @@ static bool virtqueue_use_...

This patch series performs a clean up of the code in virtio_ring and virtio_pci, modifying it to conform with the Linux kernel coding style guidance [1]. The modifications ensure the code easy to read and understand. This small series does few short cleanups in the code. Patch-1 Allow non power of 2 sizes for packed virtqueues. Patch-2 Avoid using inline for small functions. Patch-3 Use const to

This patch series performs a clean up of the code in virtio_ring and virtio_pci, modifying it to conform with the Linux kernel coding style guidance [1]. The modifications ensure the code easy to read and understand. This small series does few short cleanups in the code. Patch-1 Allow non power of 2 sizes for virtqueues Patch-2 Avoid using inline for small functions. Patch-3 Use const to annotate

This patch series performs a clean up of the code in virtio_ring and virtio_pci, modifying it to conform with the Linux kernel coding style guidance [1]. The modifications ensure the code easy to read and understand. This small series does few short cleanups in the code. Patch-1 Remove unnecessary num zero check, which performs in power_of_2. Patch-2 Avoid using inline for small functions.

...ile changed, 22 insertions(+), 15 deletions(-) diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c index c5310eaf8b46..c563215be6b9 100644 --- a/drivers/virtio/virtio_ring.c +++ b/drivers/virtio/virtio_ring.c @@ -355,9 +355,8 @@ static struct device *vring_dma_dev(const struct vring_virtqueue *vq) } /* Map one sg entry. */ -static dma_addr_t vring_map_one_sg(const struct vring_virtqueue *vq, - struct scatterlist *sg, - enum dma_data_direction direction) +static int vring_map_one_sg(const struct vring_virtqueue *vq, struct scatterlist *sg, + enum dma_data_direction...

...le changed, 12 insertions(+), 47 deletions(-) diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c index 6796cbee0207..81a9c0692fec 100644 --- a/drivers/virtio/virtio_ring.c +++ b/drivers/virtio/virtio_ring.c @@ -1350,7 +1350,7 @@ static int virtqueue_add_indirect_packed(struct vring_virtqueue *vq, struct vring_packed_desc *desc) { struct scatterlist *sg; - unsigned int i, n, err_idx; + unsigned int i, n; u16 head, id; dma_addr_t addr; @@ -1362,14 +1362,9 @@ static int virtqueue_add_indirect_packed(struct vring_virtqueue *vq, for (n = 0; n < out_sgs + in_sgs; n++)...

XDP socket(AF_XDP) is an excellent bypass kernel network framework. The zero copy feature of xsk (XDP socket) needs to be supported by the driver. The performance of zero copy is very good. ENV: Qemu with vhost. vhost cpu | Guest APP CPU |Guest Softirq CPU | PPS -----------------------------|---------------|------------------|------------ xmit by sockperf: 90% | 100%

...t; > struct vring_desc_state { > void *data; /* Data for callback. */ > - struct vring_desc *indir_desc; /* Indirect descriptor, if any. */ > + void *indir_desc; /* Indirect descriptor, if any. */ > + int num; /* Descriptor list length. */ > }; > > struct vring_virtqueue { > @@ -116,6 +117,9 @@ struct vring_virtqueue { > /* Last written value to driver->flags in > * guest byte order. */ > u16 event_flags_shadow; > + > + /* ID allocation. */ > + struct idr buffer_id; I'm not sure idr is fit for the performance critica...

...t; > struct vring_desc_state { > void *data; /* Data for callback. */ > - struct vring_desc *indir_desc; /* Indirect descriptor, if any. */ > + void *indir_desc; /* Indirect descriptor, if any. */ > + int num; /* Descriptor list length. */ > }; > > struct vring_virtqueue { > @@ -116,6 +117,9 @@ struct vring_virtqueue { > /* Last written value to driver->flags in > * guest byte order. */ > u16 event_flags_shadow; > + > + /* ID allocation. */ > + struct idr buffer_id; I'm not sure idr is fit for the performance critica...

....f5ef5f42a7cf 100644 --- a/drivers/virtio/virtio_ring.c +++ b/drivers/virtio/virtio_ring.c @@ -61,11 +61,15 @@ struct vring_desc_state { struct vring_desc *indir_desc; /* Indirect descriptor, if any. */ }; +struct vring_desc_state_packed { + int next; /* The next desc state. */ +}; + struct vring_virtqueue { struct virtqueue vq; - /* Actual memory layout for this queue */ - struct vring vring; + /* Is this a packed ring? */ + bool packed; /* Can we use weak barriers? */ bool weak_barriers; @@ -87,11 +91,39 @@ struct vring_virtqueue { /* Last used index we've seen. */ u16 last_used_i...

Hello everyone, This RFC implements packed ring support in virtio driver. Some simple functional tests have been done with Jason's packed ring implementation in vhost: https://lkml.org/lkml/2018/4/23/12 Both of ping and netperf worked as expected (with EVENT_IDX disabled). TODO: - Refinements (for code and commit log); - More tests; - Bug fixes; RFC v3 -> RFC v4: - Make ID allocation

....c4f8abc7445a 100644 --- a/drivers/virtio/virtio_ring.c +++ b/drivers/virtio/virtio_ring.c @@ -60,11 +60,15 @@ struct vring_desc_state { struct vring_desc *indir_desc; /* Indirect descriptor, if any. */ }; +struct vring_desc_state_packed { + int next; /* The next desc state. */ +}; + struct vring_virtqueue { struct virtqueue vq; - /* Actual memory layout for this queue */ - struct vring vring; + /* Is this a packed ring? */ + bool packed; /* Can we use weak barriers? */ bool weak_barriers; @@ -86,11 +90,39 @@ struct vring_virtqueue { /* Last used index we've seen. */ u16 last_used_i...

...c > index dc109fbc05a5..cdc4349f6066 100644 > --- a/drivers/virtio/virtio_ring.c > +++ b/drivers/virtio/virtio_ring.c > @@ -754,8 +754,95 @@ static bool virtqueue_kick_prepare_split(struct virtqueue *_vq) > return needs_kick; > } > > -static void detach_buf_split(struct vring_virtqueue *vq, unsigned int head, > - void **ctx) > +static void detach_cursor_init_split(struct vring_virtqueue *vq, > + struct virtqueue_detach_cursor *cursor, u16 head) > +{ > + struct vring_desc_extra *extra; > + > + extra = &vq->split.desc_extra[head]; > + &...

Hello everyone, This RFC implements packed ring support in virtio driver. Some simple functional tests have been done with Jason's packed ring implementation in vhost (RFC v4): https://lkml.org/lkml/2018/5/16/501 Both of ping and netperf worked as expected w/ EVENT_IDX disabled. Ping worked as expected w/ EVENT_IDX enabled, but netperf didn't (A hack has been added in the driver to

Hello everyone, This RFC implements packed ring support in virtio driver. Some simple functional tests have been done with Jason's packed ring implementation in vhost (RFC v4): https://lkml.org/lkml/2018/5/16/501 Both of ping and netperf worked as expected w/ EVENT_IDX disabled. Ping worked as expected w/ EVENT_IDX enabled, but netperf didn't (A hack has been added in the driver to

## About DMA APIs Now, virtio may can not work with DMA APIs when virtio features do not have VIRTIO_F_ACCESS_PLATFORM. 1. I tried to let DMA APIs return phy address by virtio-device. But DMA APIs just work with the "real" devices. 2. I tried to let xsk support callballs to get phy address from virtio-net driver as the dma address. But the maintainers of xsk may want to use

...drivers/virtio/virtio_ring.c @@ -58,14 +58,15 @@ struct vring_desc_state { void *data; /* Data for callback. */ - struct vring_desc *indir_desc; /* Indirect descriptor, if any. */ + void *indir_desc; /* Indirect descriptor, if any. */ + int num; /* Descriptor list length. */ }; struct vring_virtqueue { struct virtqueue vq; - /* Actual memory layout for this queue */ - struct vring vring; + /* Is this a packed ring? */ + bool packed; /* Can we use weak barriers? */ bool weak_barriers; @@ -79,19 +80,45 @@ struct vring_virtqueue { /* Host publishes avail event idx */ bool event; -...

...drivers/virtio/virtio_ring.c @@ -58,14 +58,15 @@ struct vring_desc_state { void *data; /* Data for callback. */ - struct vring_desc *indir_desc; /* Indirect descriptor, if any. */ + void *indir_desc; /* Indirect descriptor, if any. */ + int num; /* Descriptor list length. */ }; struct vring_virtqueue { struct virtqueue vq; - /* Actual memory layout for this queue */ - struct vring vring; + /* Is this a packed ring? */ + bool packed; /* Can we use weak barriers? */ bool weak_barriers; @@ -79,19 +80,45 @@ struct vring_virtqueue { /* Host publishes avail event idx */ bool event; -...

...t; > struct vring_desc_state { > void *data; /* Data for callback. */ > - struct vring_desc *indir_desc; /* Indirect descriptor, if any. */ > + void *indir_desc; /* Indirect descriptor, if any. */ > + int num; /* Descriptor list length. */ > }; > > struct vring_virtqueue { > struct virtqueue vq; > > - /* Actual memory layout for this queue */ > - struct vring vring; > + /* Is this a packed ring? */ > + bool packed; > > /* Can we use weak barriers? */ > bool weak_barriers; > @@ -79,19 +80,45 @@ struct vring_virtqueue { &g...