xsk: add user memory registration support sockopt
In this commit the base structure of the AF_XDP address family is set
up. Further, we introduce the abilty register a window of user memory
to the kernel via the XDP_UMEM_REG setsockopt syscall. The memory
window is viewed by an AF_XDP socket as a set of equally large
frames. After a user memory registration all frames are "owned" by the
user application, and not the kernel.
v2: More robust checks on umem creation and unaccount on error.
Call set_page_dirty_lock on cleanup.
Simplified xdp_umem_reg.
Co-authored-by: Magnus Karlsson <magnus.karlsson@intel.com>
Signed-off-by: Magnus Karlsson <magnus.karlsson@intel.com>
Signed-off-by: Björn Töpel <bjorn.topel@intel.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Björn Töpel
Alexei Starovoitov
Родитель
68e8b849b2
Коммит
c0c77d8fb7
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@ -0,0 +1,31 @@
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/* SPDX-License-Identifier: GPL-2.0
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* AF_XDP internal functions
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* Copyright(c) 2018 Intel Corporation.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
|
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
|
||||
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
|
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
|
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* more details.
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*/
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#ifndef _LINUX_XDP_SOCK_H
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#define _LINUX_XDP_SOCK_H
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#include <linux/mutex.h>
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#include <net/sock.h>
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struct xdp_umem;
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struct xdp_sock {
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/* struct sock must be the first member of struct xdp_sock */
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struct sock sk;
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struct xdp_umem *umem;
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/* Protects multiple processes in the control path */
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struct mutex mutex;
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};
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#endif /* _LINUX_XDP_SOCK_H */
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@ -0,0 +1,34 @@
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/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note
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*
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* if_xdp: XDP socket user-space interface
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* Copyright(c) 2018 Intel Corporation.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
|
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* version 2, as published by the Free Software Foundation.
|
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*
|
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* This program is distributed in the hope it will be useful, but WITHOUT
|
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
|
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
|
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* more details.
|
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*
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* Author(s): Björn Töpel <bjorn.topel@intel.com>
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* Magnus Karlsson <magnus.karlsson@intel.com>
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*/
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#ifndef _LINUX_IF_XDP_H
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#define _LINUX_IF_XDP_H
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#include <linux/types.h>
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/* XDP socket options */
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#define XDP_UMEM_REG 3
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struct xdp_umem_reg {
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__u64 addr; /* Start of packet data area */
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__u64 len; /* Length of packet data area */
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__u32 frame_size; /* Frame size */
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__u32 frame_headroom; /* Frame head room */
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};
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#endif /* _LINUX_IF_XDP_H */
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@ -85,3 +85,4 @@ obj-y += l3mdev/
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endif
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obj-$(CONFIG_QRTR) += qrtr/
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obj-$(CONFIG_NET_NCSI) += ncsi/
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obj-$(CONFIG_XDP_SOCKETS) += xdp/
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@ -0,0 +1,2 @@
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obj-$(CONFIG_XDP_SOCKETS) += xsk.o xdp_umem.o
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@ -0,0 +1,245 @@
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// SPDX-License-Identifier: GPL-2.0
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/* XDP user-space packet buffer
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* Copyright(c) 2018 Intel Corporation.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
|
||||
* version 2, as published by the Free Software Foundation.
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*
|
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* This program is distributed in the hope it will be useful, but WITHOUT
|
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
|
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
|
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* more details.
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*/
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#include <linux/init.h>
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#include <linux/sched/mm.h>
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#include <linux/sched/signal.h>
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#include <linux/sched/task.h>
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#include <linux/uaccess.h>
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#include <linux/slab.h>
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#include <linux/bpf.h>
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#include <linux/mm.h>
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#include "xdp_umem.h"
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#define XDP_UMEM_MIN_FRAME_SIZE 2048
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int xdp_umem_create(struct xdp_umem **umem)
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{
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*umem = kzalloc(sizeof(**umem), GFP_KERNEL);
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if (!(*umem))
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return -ENOMEM;
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return 0;
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}
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static void xdp_umem_unpin_pages(struct xdp_umem *umem)
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{
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unsigned int i;
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if (umem->pgs) {
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for (i = 0; i < umem->npgs; i++) {
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struct page *page = umem->pgs[i];
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set_page_dirty_lock(page);
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put_page(page);
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}
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kfree(umem->pgs);
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umem->pgs = NULL;
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}
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}
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static void xdp_umem_unaccount_pages(struct xdp_umem *umem)
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{
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if (umem->user) {
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atomic_long_sub(umem->npgs, &umem->user->locked_vm);
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free_uid(umem->user);
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}
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}
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static void xdp_umem_release(struct xdp_umem *umem)
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{
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struct task_struct *task;
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struct mm_struct *mm;
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if (umem->pgs) {
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xdp_umem_unpin_pages(umem);
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task = get_pid_task(umem->pid, PIDTYPE_PID);
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put_pid(umem->pid);
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if (!task)
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goto out;
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mm = get_task_mm(task);
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put_task_struct(task);
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if (!mm)
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goto out;
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mmput(mm);
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umem->pgs = NULL;
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}
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xdp_umem_unaccount_pages(umem);
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out:
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kfree(umem);
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}
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static void xdp_umem_release_deferred(struct work_struct *work)
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{
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struct xdp_umem *umem = container_of(work, struct xdp_umem, work);
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xdp_umem_release(umem);
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}
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void xdp_get_umem(struct xdp_umem *umem)
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{
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atomic_inc(&umem->users);
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}
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void xdp_put_umem(struct xdp_umem *umem)
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{
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if (!umem)
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return;
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if (atomic_dec_and_test(&umem->users)) {
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INIT_WORK(&umem->work, xdp_umem_release_deferred);
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schedule_work(&umem->work);
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}
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}
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static int xdp_umem_pin_pages(struct xdp_umem *umem)
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{
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unsigned int gup_flags = FOLL_WRITE;
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long npgs;
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int err;
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umem->pgs = kcalloc(umem->npgs, sizeof(*umem->pgs), GFP_KERNEL);
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if (!umem->pgs)
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return -ENOMEM;
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down_write(¤t->mm->mmap_sem);
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npgs = get_user_pages(umem->address, umem->npgs,
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gup_flags, &umem->pgs[0], NULL);
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up_write(¤t->mm->mmap_sem);
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if (npgs != umem->npgs) {
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if (npgs >= 0) {
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umem->npgs = npgs;
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err = -ENOMEM;
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goto out_pin;
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}
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err = npgs;
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goto out_pgs;
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}
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return 0;
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out_pin:
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xdp_umem_unpin_pages(umem);
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out_pgs:
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kfree(umem->pgs);
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umem->pgs = NULL;
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return err;
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}
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static int xdp_umem_account_pages(struct xdp_umem *umem)
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{
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unsigned long lock_limit, new_npgs, old_npgs;
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if (capable(CAP_IPC_LOCK))
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return 0;
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lock_limit = rlimit(RLIMIT_MEMLOCK) >> PAGE_SHIFT;
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umem->user = get_uid(current_user());
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do {
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old_npgs = atomic_long_read(&umem->user->locked_vm);
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new_npgs = old_npgs + umem->npgs;
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if (new_npgs > lock_limit) {
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free_uid(umem->user);
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umem->user = NULL;
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return -ENOBUFS;
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}
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} while (atomic_long_cmpxchg(&umem->user->locked_vm, old_npgs,
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new_npgs) != old_npgs);
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return 0;
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}
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int xdp_umem_reg(struct xdp_umem *umem, struct xdp_umem_reg *mr)
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{
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u32 frame_size = mr->frame_size, frame_headroom = mr->frame_headroom;
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u64 addr = mr->addr, size = mr->len;
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unsigned int nframes, nfpp;
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int size_chk, err;
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if (!umem)
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return -EINVAL;
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if (frame_size < XDP_UMEM_MIN_FRAME_SIZE || frame_size > PAGE_SIZE) {
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/* Strictly speaking we could support this, if:
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* - huge pages, or*
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* - using an IOMMU, or
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* - making sure the memory area is consecutive
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* but for now, we simply say "computer says no".
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*/
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return -EINVAL;
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}
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if (!is_power_of_2(frame_size))
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return -EINVAL;
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if (!PAGE_ALIGNED(addr)) {
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/* Memory area has to be page size aligned. For
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* simplicity, this might change.
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*/
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return -EINVAL;
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}
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if ((addr + size) < addr)
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return -EINVAL;
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nframes = size / frame_size;
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if (nframes == 0 || nframes > UINT_MAX)
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return -EINVAL;
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nfpp = PAGE_SIZE / frame_size;
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if (nframes < nfpp || nframes % nfpp)
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return -EINVAL;
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frame_headroom = ALIGN(frame_headroom, 64);
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size_chk = frame_size - frame_headroom - XDP_PACKET_HEADROOM;
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if (size_chk < 0)
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return -EINVAL;
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umem->pid = get_task_pid(current, PIDTYPE_PID);
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umem->size = (size_t)size;
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umem->address = (unsigned long)addr;
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umem->props.frame_size = frame_size;
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umem->props.nframes = nframes;
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umem->frame_headroom = frame_headroom;
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umem->npgs = size / PAGE_SIZE;
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umem->pgs = NULL;
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umem->user = NULL;
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umem->frame_size_log2 = ilog2(frame_size);
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umem->nfpp_mask = nfpp - 1;
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umem->nfpplog2 = ilog2(nfpp);
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atomic_set(&umem->users, 1);
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err = xdp_umem_account_pages(umem);
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if (err)
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goto out;
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err = xdp_umem_pin_pages(umem);
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||||
if (err)
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goto out_account;
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return 0;
|
||||
|
||||
out_account:
|
||||
xdp_umem_unaccount_pages(umem);
|
||||
out:
|
||||
put_pid(umem->pid);
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||||
return err;
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||||
}
|
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|
|
@ -0,0 +1,45 @@
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|||
/* SPDX-License-Identifier: GPL-2.0
|
||||
* XDP user-space packet buffer
|
||||
* Copyright(c) 2018 Intel Corporation.
|
||||
*
|
||||
* This program is free software; you can redistribute it and/or modify it
|
||||
* under the terms and conditions of the GNU General Public License,
|
||||
* version 2, as published by the Free Software Foundation.
|
||||
*
|
||||
* This program is distributed in the hope it will be useful, but WITHOUT
|
||||
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
|
||||
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
|
||||
* more details.
|
||||
*/
|
||||
|
||||
#ifndef XDP_UMEM_H_
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#define XDP_UMEM_H_
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|
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#include <linux/mm.h>
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||||
#include <linux/if_xdp.h>
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#include <linux/workqueue.h>
|
||||
|
||||
#include "xdp_umem_props.h"
|
||||
|
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struct xdp_umem {
|
||||
struct page **pgs;
|
||||
struct xdp_umem_props props;
|
||||
u32 npgs;
|
||||
u32 frame_headroom;
|
||||
u32 nfpp_mask;
|
||||
u32 nfpplog2;
|
||||
u32 frame_size_log2;
|
||||
struct user_struct *user;
|
||||
struct pid *pid;
|
||||
unsigned long address;
|
||||
size_t size;
|
||||
atomic_t users;
|
||||
struct work_struct work;
|
||||
};
|
||||
|
||||
int xdp_umem_reg(struct xdp_umem *umem, struct xdp_umem_reg *mr);
|
||||
void xdp_get_umem(struct xdp_umem *umem);
|
||||
void xdp_put_umem(struct xdp_umem *umem);
|
||||
int xdp_umem_create(struct xdp_umem **umem);
|
||||
|
||||
#endif /* XDP_UMEM_H_ */
|
||||
|
|
@ -0,0 +1,23 @@
|
|||
/* SPDX-License-Identifier: GPL-2.0
|
||||
* XDP user-space packet buffer
|
||||
* Copyright(c) 2018 Intel Corporation.
|
||||
*
|
||||
* This program is free software; you can redistribute it and/or modify it
|
||||
* under the terms and conditions of the GNU General Public License,
|
||||
* version 2, as published by the Free Software Foundation.
|
||||
*
|
||||
* This program is distributed in the hope it will be useful, but WITHOUT
|
||||
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
|
||||
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
|
||||
* more details.
|
||||
*/
|
||||
|
||||
#ifndef XDP_UMEM_PROPS_H_
|
||||
#define XDP_UMEM_PROPS_H_
|
||||
|
||||
struct xdp_umem_props {
|
||||
u32 frame_size;
|
||||
u32 nframes;
|
||||
};
|
||||
|
||||
#endif /* XDP_UMEM_PROPS_H_ */
|
||||
|
|
@ -0,0 +1,215 @@
|
|||
// SPDX-License-Identifier: GPL-2.0
|
||||
/* XDP sockets
|
||||
*
|
||||
* AF_XDP sockets allows a channel between XDP programs and userspace
|
||||
* applications.
|
||||
* Copyright(c) 2018 Intel Corporation.
|
||||
*
|
||||
* This program is free software; you can redistribute it and/or modify it
|
||||
* under the terms and conditions of the GNU General Public License,
|
||||
* version 2, as published by the Free Software Foundation.
|
||||
*
|
||||
* This program is distributed in the hope it will be useful, but WITHOUT
|
||||
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
|
||||
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
|
||||
* more details.
|
||||
*
|
||||
* Author(s): Björn Töpel <bjorn.topel@intel.com>
|
||||
* Magnus Karlsson <magnus.karlsson@intel.com>
|
||||
*/
|
||||
|
||||
#define pr_fmt(fmt) "AF_XDP: %s: " fmt, __func__
|
||||
|
||||
#include <linux/if_xdp.h>
|
||||
#include <linux/init.h>
|
||||
#include <linux/sched/mm.h>
|
||||
#include <linux/sched/signal.h>
|
||||
#include <linux/sched/task.h>
|
||||
#include <linux/socket.h>
|
||||
#include <linux/file.h>
|
||||
#include <linux/uaccess.h>
|
||||
#include <linux/net.h>
|
||||
#include <linux/netdevice.h>
|
||||
#include <net/xdp_sock.h>
|
||||
|
||||
#include "xdp_umem.h"
|
||||
|
||||
static struct xdp_sock *xdp_sk(struct sock *sk)
|
||||
{
|
||||
return (struct xdp_sock *)sk;
|
||||
}
|
||||
|
||||
static int xsk_release(struct socket *sock)
|
||||
{
|
||||
struct sock *sk = sock->sk;
|
||||
struct net *net;
|
||||
|
||||
if (!sk)
|
||||
return 0;
|
||||
|
||||
net = sock_net(sk);
|
||||
|
||||
local_bh_disable();
|
||||
sock_prot_inuse_add(net, sk->sk_prot, -1);
|
||||
local_bh_enable();
|
||||
|
||||
sock_orphan(sk);
|
||||
sock->sk = NULL;
|
||||
|
||||
sk_refcnt_debug_release(sk);
|
||||
sock_put(sk);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int xsk_setsockopt(struct socket *sock, int level, int optname,
|
||||
char __user *optval, unsigned int optlen)
|
||||
{
|
||||
struct sock *sk = sock->sk;
|
||||
struct xdp_sock *xs = xdp_sk(sk);
|
||||
int err;
|
||||
|
||||
if (level != SOL_XDP)
|
||||
return -ENOPROTOOPT;
|
||||
|
||||
switch (optname) {
|
||||
case XDP_UMEM_REG:
|
||||
{
|
||||
struct xdp_umem_reg mr;
|
||||
struct xdp_umem *umem;
|
||||
|
||||
if (xs->umem)
|
||||
return -EBUSY;
|
||||
|
||||
if (copy_from_user(&mr, optval, sizeof(mr)))
|
||||
return -EFAULT;
|
||||
|
||||
mutex_lock(&xs->mutex);
|
||||
err = xdp_umem_create(&umem);
|
||||
|
||||
err = xdp_umem_reg(umem, &mr);
|
||||
if (err) {
|
||||
kfree(umem);
|
||||
mutex_unlock(&xs->mutex);
|
||||
return err;
|
||||
}
|
||||
|
||||
/* Make sure umem is ready before it can be seen by others */
|
||||
smp_wmb();
|
||||
|
||||
xs->umem = umem;
|
||||
mutex_unlock(&xs->mutex);
|
||||
return 0;
|
||||
}
|
||||
default:
|
||||
break;
|
||||
}
|
||||
|
||||
return -ENOPROTOOPT;
|
||||
}
|
||||
|
||||
static struct proto xsk_proto = {
|
||||
.name = "XDP",
|
||||
.owner = THIS_MODULE,
|
||||
.obj_size = sizeof(struct xdp_sock),
|
||||
};
|
||||
|
||||
static const struct proto_ops xsk_proto_ops = {
|
||||
.family = PF_XDP,
|
||||
.owner = THIS_MODULE,
|
||||
.release = xsk_release,
|
||||
.bind = sock_no_bind,
|
||||
.connect = sock_no_connect,
|
||||
.socketpair = sock_no_socketpair,
|
||||
.accept = sock_no_accept,
|
||||
.getname = sock_no_getname,
|
||||
.poll = sock_no_poll,
|
||||
.ioctl = sock_no_ioctl,
|
||||
.listen = sock_no_listen,
|
||||
.shutdown = sock_no_shutdown,
|
||||
.setsockopt = xsk_setsockopt,
|
||||
.getsockopt = sock_no_getsockopt,
|
||||
.sendmsg = sock_no_sendmsg,
|
||||
.recvmsg = sock_no_recvmsg,
|
||||
.mmap = sock_no_mmap,
|
||||
.sendpage = sock_no_sendpage,
|
||||
};
|
||||
|
||||
static void xsk_destruct(struct sock *sk)
|
||||
{
|
||||
struct xdp_sock *xs = xdp_sk(sk);
|
||||
|
||||
if (!sock_flag(sk, SOCK_DEAD))
|
||||
return;
|
||||
|
||||
xdp_put_umem(xs->umem);
|
||||
|
||||
sk_refcnt_debug_dec(sk);
|
||||
}
|
||||
|
||||
static int xsk_create(struct net *net, struct socket *sock, int protocol,
|
||||
int kern)
|
||||
{
|
||||
struct sock *sk;
|
||||
struct xdp_sock *xs;
|
||||
|
||||
if (!ns_capable(net->user_ns, CAP_NET_RAW))
|
||||
return -EPERM;
|
||||
if (sock->type != SOCK_RAW)
|
||||
return -ESOCKTNOSUPPORT;
|
||||
|
||||
if (protocol)
|
||||
return -EPROTONOSUPPORT;
|
||||
|
||||
sock->state = SS_UNCONNECTED;
|
||||
|
||||
sk = sk_alloc(net, PF_XDP, GFP_KERNEL, &xsk_proto, kern);
|
||||
if (!sk)
|
||||
return -ENOBUFS;
|
||||
|
||||
sock->ops = &xsk_proto_ops;
|
||||
|
||||
sock_init_data(sock, sk);
|
||||
|
||||
sk->sk_family = PF_XDP;
|
||||
|
||||
sk->sk_destruct = xsk_destruct;
|
||||
sk_refcnt_debug_inc(sk);
|
||||
|
||||
xs = xdp_sk(sk);
|
||||
mutex_init(&xs->mutex);
|
||||
|
||||
local_bh_disable();
|
||||
sock_prot_inuse_add(net, &xsk_proto, 1);
|
||||
local_bh_enable();
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static const struct net_proto_family xsk_family_ops = {
|
||||
.family = PF_XDP,
|
||||
.create = xsk_create,
|
||||
.owner = THIS_MODULE,
|
||||
};
|
||||
|
||||
static int __init xsk_init(void)
|
||||
{
|
||||
int err;
|
||||
|
||||
err = proto_register(&xsk_proto, 0 /* no slab */);
|
||||
if (err)
|
||||
goto out;
|
||||
|
||||
err = sock_register(&xsk_family_ops);
|
||||
if (err)
|
||||
goto out_proto;
|
||||
|
||||
return 0;
|
||||
|
||||
out_proto:
|
||||
proto_unregister(&xsk_proto);
|
||||
out:
|
||||
return err;
|
||||
}
|
||||
|
||||
fs_initcall(xsk_init);
|
||||
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