search for: copy_page_from_iter

...> + buf = (char *)page_address(alloc_frag->page) + alloc_frag->offset; > + > + /* We store two kinds of metadata in the header which will be > + * used for XDP_PASS to do build_skb(): > + * offset 0: buflen > + * offset sizeof(int): vnet header > + */ > + copied = copy_page_from_iter(alloc_frag->page, > + alloc_frag->offset + sizeof(int), sock_hlen, from); > + if (copied != sock_hlen) > + return -EFAULT; > + > + gso = (struct virtio_net_hdr *)(buf + sizeof(int)); > + > + if ((gso->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) && > +...

...frag, GFP_KERNEL))) + return -ENOMEM; + + buf = (char *)page_address(alloc_frag->page) + alloc_frag->offset; + + /* We store two kinds of metadata in the header which will be + * used for XDP_PASS to do build_skb(): + * offset 0: buflen + * offset sizeof(int): vnet header + */ + copied = copy_page_from_iter(alloc_frag->page, + alloc_frag->offset + sizeof(int), sock_hlen, from); + if (copied != sock_hlen) + return -EFAULT; + + gso = (struct virtio_net_hdr *)(buf + sizeof(int)); + + if ((gso->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) && + vhost16_to_cpu(vq, gso->csum_star...

...rag->page) + alloc_frag->offset; > + > + /* We store two kinds of metadata in the header which will be > + * used for XDP_PASS to do build_skb(): > + * offset 0: buflen > + * offset sizeof(int): vnet header Define a struct for the metadata then? > + */ > + copied = copy_page_from_iter(alloc_frag->page, > + alloc_frag->offset + sizeof(int), > + sock_hlen, from); > + if (copied != sock_hlen) > + return -EFAULT; > + > + gso = (struct virtio_net_hdr *)(buf + sizeof(int)); > + > + if ((gso->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) &am...

...rag->page) + alloc_frag->offset; > + > + /* We store two kinds of metadata in the header which will be > + * used for XDP_PASS to do build_skb(): > + * offset 0: buflen > + * offset sizeof(int): vnet header Define a struct for the metadata then? > + */ > + copied = copy_page_from_iter(alloc_frag->page, > + alloc_frag->offset + sizeof(int), > + sock_hlen, from); > + if (copied != sock_hlen) > + return -EFAULT; > + > + gso = (struct virtio_net_hdr *)(buf + sizeof(int)); > + > + if ((gso->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) &am...

...frag, GFP_KERNEL))) + return -ENOMEM; + + buf = (char *)page_address(alloc_frag->page) + alloc_frag->offset; + + /* We store two kinds of metadata in the header which will be + * used for XDP_PASS to do build_skb(): + * offset 0: buflen + * offset sizeof(int): vnet header + */ + copied = copy_page_from_iter(alloc_frag->page, + alloc_frag->offset + sizeof(int), + sock_hlen, from); + if (copied != sock_hlen) + return -EFAULT; + + gso = (struct virtio_net_hdr *)(buf + sizeof(int)); + + if ((gso->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) && + vhost16_to_cpu(vq, gso-&gt...

...C; + + buflen += SKB_DATA_ALIGN(len + pad); + alloc_frag->offset = ALIGN((u64)alloc_frag->offset, SMP_CACHE_BYTES); + if (unlikely(!skb_page_frag_refill(buflen, alloc_frag, GFP_KERNEL))) + return -ENOMEM; + + buf = (char *)page_address(alloc_frag->page) + alloc_frag->offset; + copied = copy_page_from_iter(alloc_frag->page, + alloc_frag->offset + + offsetof(struct tun_xdp_hdr, gso), + sock_hlen, from); + if (copied != sock_hlen) + return -EFAULT; + + hdr = buf; + gso = &hdr->gso; + + if ((gso->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) && + vhost16_t...

...; + >> + /* We store two kinds of metadata in the header which will be >> + * used for XDP_PASS to do build_skb(): >> + * offset 0: buflen >> + * offset sizeof(int): vnet header > Define a struct for the metadata then? Ok. > > >> + */ >> + copied = copy_page_from_iter(alloc_frag->page, >> + alloc_frag->offset + sizeof(int), >> + sock_hlen, from); >> + if (copied != sock_hlen) >> + return -EFAULT; >> + >> + gso = (struct virtio_net_hdr *)(buf + sizeof(int)); >> + >> + if ((gso->flags &...

Hi all: We do not support XDP batching for TUN since it can only receive one packet a time from vhost_net. This series tries to remove this limitation by: - introduce a TUN specific msg_control that can hold a pointer to an array of XDP buffs - try copy and build XDP buff in vhost_net - store XDP buffs in an array and submit them once for every N packets from vhost_net - since TUN can only

...ude/linux/uio.h index 1b5d1cd796e2..4be6b24003d8 100644 --- a/include/linux/uio.h +++ b/include/linux/uio.h @@ -9,6 +9,7 @@ #ifndef __LINUX_UIO_H #define __LINUX_UIO_H +#include <linux/sched.h> #include <linux/kernel.h> #include <uapi/linux/uio.h> @@ -84,6 +85,15 @@ size_t copy_page_from_iter(struct page *page, size_t offset, size_t bytes, struct iov_iter *i); size_t copy_to_iter(const void *addr, size_t bytes, struct iov_iter *i); size_t copy_from_iter(void *addr, size_t bytes, struct iov_iter *i); + +static inline size_t copy_from_iter_mm(struct mm_struct *mm, void *addr, + si...

...ude/linux/uio.h index 1b5d1cd796e2..4be6b24003d8 100644 --- a/include/linux/uio.h +++ b/include/linux/uio.h @@ -9,6 +9,7 @@ #ifndef __LINUX_UIO_H #define __LINUX_UIO_H +#include <linux/sched.h> #include <linux/kernel.h> #include <uapi/linux/uio.h> @@ -84,6 +85,15 @@ size_t copy_page_from_iter(struct page *page, size_t offset, size_t bytes, struct iov_iter *i); size_t copy_to_iter(const void *addr, size_t bytes, struct iov_iter *i); size_t copy_from_iter(void *addr, size_t bytes, struct iov_iter *i); + +static inline size_t copy_from_iter_mm(struct mm_struct *mm, void *addr, + si...

...> --- a/include/linux/uio.h > +++ b/include/linux/uio.h > @@ -9,6 +9,7 @@ > #ifndef __LINUX_UIO_H > #define __LINUX_UIO_H > > +#include <linux/sched.h> > #include <linux/kernel.h> > #include <uapi/linux/uio.h> > > @@ -84,6 +85,15 @@ size_t copy_page_from_iter(struct page *page, size_t offset, size_t bytes, > struct iov_iter *i); > size_t copy_to_iter(const void *addr, size_t bytes, struct iov_iter *i); > size_t copy_from_iter(void *addr, size_t bytes, struct iov_iter *i); > + > +static inline size_t copy_from_iter_mm(struct mm_stru...

The following patches were made over Linus's tree and fix an issue where windows guests will send iovecs with offset/lengths that result in IOs that are not aligned to 512. The LIO layer will then send them to Linux's FS/block layer but it requires 512 byte alignment, so depending on the FS/block driver being used we will get IO errors or hung IO. The following patches have vhost-scsi

Hi all: This series tries to batch submitting packets to underlayer socket through msg_control during sendmsg(). This is done by: 1) Doing userspace copy inside vhost_net 2) Build XDP buff 3) Batch at most 64 (VHOST_NET_BATCH) XDP buffs and submit them once through msg_control during sendmsg(). 4) Underlayer sockets can use XDP buffs directly when XDP is enalbed, or build skb based on XDP

The following patches were made over Linus's tree and fix an issue where windows guests will send iovecs with offset/lengths that result in IOs that are not aligned to 512. The LIO layer will then send them to Linux's block layer but it requires 512 byte alignment, so depending on the block driver being used we will get IO errors or hung IO. The following patches have vhost-scsi detect

Hi all: This series tries to batch submitting packets to underlayer socket through msg_control during sendmsg(). This is done by: 1) Doing userspace copy inside vhost_net 2) Build XDP buff 3) Batch at most 64 (VHOST_NET_BATCH) XDP buffs and submit them once through msg_control during sendmsg(). 4) Underlayer sockets can use XDP buffs directly when XDP is enalbed, or build skb based on XDP

Hi all: This series tries to batch submitting packets to underlayer socket through msg_control during sendmsg(). This is done by: 1) Doing userspace copy inside vhost_net 2) Build XDP buff 3) Batch at most 64 (VHOST_NET_BATCH) XDP buffs and submit them once through msg_control during sendmsg(). 4) Underlayer sockets can use XDP buffs directly when XDP is enalbed, or build skb based on XDP