1c0c77d8fSBjörn Töpel // SPDX-License-Identifier: GPL-2.0 2c0c77d8fSBjörn Töpel /* XDP user-space packet buffer 3c0c77d8fSBjörn Töpel * Copyright(c) 2018 Intel Corporation. 4c0c77d8fSBjörn Töpel */ 5c0c77d8fSBjörn Töpel 6c0c77d8fSBjörn Töpel #include <linux/init.h> 7c0c77d8fSBjörn Töpel #include <linux/sched/mm.h> 8c0c77d8fSBjörn Töpel #include <linux/sched/signal.h> 9c0c77d8fSBjörn Töpel #include <linux/sched/task.h> 10c0c77d8fSBjörn Töpel #include <linux/uaccess.h> 11c0c77d8fSBjörn Töpel #include <linux/slab.h> 12c0c77d8fSBjörn Töpel #include <linux/bpf.h> 13c0c77d8fSBjörn Töpel #include <linux/mm.h> 1484c6b868SJakub Kicinski #include <linux/netdevice.h> 1584c6b868SJakub Kicinski #include <linux/rtnetlink.h> 16c0c77d8fSBjörn Töpel 17c0c77d8fSBjörn Töpel #include "xdp_umem.h" 18e61e62b9SBjörn Töpel #include "xsk_queue.h" 19c0c77d8fSBjörn Töpel 20bbff2f32SBjörn Töpel #define XDP_UMEM_MIN_CHUNK_SIZE 2048 21c0c77d8fSBjörn Töpel 22ac98d8aaSMagnus Karlsson void xdp_add_sk_umem(struct xdp_umem *umem, struct xdp_sock *xs) 23ac98d8aaSMagnus Karlsson { 24ac98d8aaSMagnus Karlsson unsigned long flags; 25ac98d8aaSMagnus Karlsson 26ac98d8aaSMagnus Karlsson spin_lock_irqsave(&umem->xsk_list_lock, flags); 27ac98d8aaSMagnus Karlsson list_add_rcu(&xs->list, &umem->xsk_list); 28ac98d8aaSMagnus Karlsson spin_unlock_irqrestore(&umem->xsk_list_lock, flags); 29ac98d8aaSMagnus Karlsson } 30ac98d8aaSMagnus Karlsson 31ac98d8aaSMagnus Karlsson void xdp_del_sk_umem(struct xdp_umem *umem, struct xdp_sock *xs) 32ac98d8aaSMagnus Karlsson { 33ac98d8aaSMagnus Karlsson unsigned long flags; 34ac98d8aaSMagnus Karlsson 35ac98d8aaSMagnus Karlsson spin_lock_irqsave(&umem->xsk_list_lock, flags); 36ac98d8aaSMagnus Karlsson list_del_rcu(&xs->list); 37ac98d8aaSMagnus Karlsson spin_unlock_irqrestore(&umem->xsk_list_lock, flags); 38ac98d8aaSMagnus Karlsson } 39ac98d8aaSMagnus Karlsson 40c9b47cc1SMagnus Karlsson /* The umem is stored both in the _rx struct and the _tx struct as we do 41c9b47cc1SMagnus Karlsson * not know if the device has more tx queues than rx, or the opposite. 42c9b47cc1SMagnus Karlsson * This might also change during run time. 43c9b47cc1SMagnus Karlsson */ 44cc5b5d35SKrzysztof Kazimierczak static int xdp_reg_umem_at_qid(struct net_device *dev, struct xdp_umem *umem, 45c9b47cc1SMagnus Karlsson u16 queue_id) 4684c6b868SJakub Kicinski { 47cc5b5d35SKrzysztof Kazimierczak if (queue_id >= max_t(unsigned int, 48cc5b5d35SKrzysztof Kazimierczak dev->real_num_rx_queues, 49cc5b5d35SKrzysztof Kazimierczak dev->real_num_tx_queues)) 50cc5b5d35SKrzysztof Kazimierczak return -EINVAL; 51cc5b5d35SKrzysztof Kazimierczak 52c9b47cc1SMagnus Karlsson if (queue_id < dev->real_num_rx_queues) 53c9b47cc1SMagnus Karlsson dev->_rx[queue_id].umem = umem; 54c9b47cc1SMagnus Karlsson if (queue_id < dev->real_num_tx_queues) 55c9b47cc1SMagnus Karlsson dev->_tx[queue_id].umem = umem; 56cc5b5d35SKrzysztof Kazimierczak 57cc5b5d35SKrzysztof Kazimierczak return 0; 58c9b47cc1SMagnus Karlsson } 5984c6b868SJakub Kicinski 601661d346SJakub Kicinski struct xdp_umem *xdp_get_umem_from_qid(struct net_device *dev, 61c9b47cc1SMagnus Karlsson u16 queue_id) 62c9b47cc1SMagnus Karlsson { 63c9b47cc1SMagnus Karlsson if (queue_id < dev->real_num_rx_queues) 64c9b47cc1SMagnus Karlsson return dev->_rx[queue_id].umem; 65c9b47cc1SMagnus Karlsson if (queue_id < dev->real_num_tx_queues) 66c9b47cc1SMagnus Karlsson return dev->_tx[queue_id].umem; 6784c6b868SJakub Kicinski 68c9b47cc1SMagnus Karlsson return NULL; 69c9b47cc1SMagnus Karlsson } 7084c6b868SJakub Kicinski 71c9b47cc1SMagnus Karlsson static void xdp_clear_umem_at_qid(struct net_device *dev, u16 queue_id) 72c9b47cc1SMagnus Karlsson { 73a41b4f3cSMagnus Karlsson if (queue_id < dev->real_num_rx_queues) 74c9b47cc1SMagnus Karlsson dev->_rx[queue_id].umem = NULL; 75a41b4f3cSMagnus Karlsson if (queue_id < dev->real_num_tx_queues) 76c9b47cc1SMagnus Karlsson dev->_tx[queue_id].umem = NULL; 7784c6b868SJakub Kicinski } 7884c6b868SJakub Kicinski 79173d3adbSBjörn Töpel int xdp_umem_assign_dev(struct xdp_umem *umem, struct net_device *dev, 80c9b47cc1SMagnus Karlsson u16 queue_id, u16 flags) 81173d3adbSBjörn Töpel { 82173d3adbSBjörn Töpel bool force_zc, force_copy; 83173d3adbSBjörn Töpel struct netdev_bpf bpf; 84c9b47cc1SMagnus Karlsson int err = 0; 85173d3adbSBjörn Töpel 86173d3adbSBjörn Töpel force_zc = flags & XDP_ZEROCOPY; 87173d3adbSBjörn Töpel force_copy = flags & XDP_COPY; 88173d3adbSBjörn Töpel 89173d3adbSBjörn Töpel if (force_zc && force_copy) 90173d3adbSBjörn Töpel return -EINVAL; 91173d3adbSBjörn Töpel 92173d3adbSBjörn Töpel rtnl_lock(); 93c9b47cc1SMagnus Karlsson if (xdp_get_umem_from_qid(dev, queue_id)) { 94c9b47cc1SMagnus Karlsson err = -EBUSY; 95c9b47cc1SMagnus Karlsson goto out_rtnl_unlock; 96c9b47cc1SMagnus Karlsson } 97c9b47cc1SMagnus Karlsson 98cc5b5d35SKrzysztof Kazimierczak err = xdp_reg_umem_at_qid(dev, umem, queue_id); 99cc5b5d35SKrzysztof Kazimierczak if (err) 100cc5b5d35SKrzysztof Kazimierczak goto out_rtnl_unlock; 101cc5b5d35SKrzysztof Kazimierczak 102c9b47cc1SMagnus Karlsson umem->dev = dev; 103c9b47cc1SMagnus Karlsson umem->queue_id = queue_id; 104c9b47cc1SMagnus Karlsson if (force_copy) 105c9b47cc1SMagnus Karlsson /* For copy-mode, we are done. */ 106c9b47cc1SMagnus Karlsson goto out_rtnl_unlock; 107c9b47cc1SMagnus Karlsson 108c9b47cc1SMagnus Karlsson if (!dev->netdev_ops->ndo_bpf || 109c9b47cc1SMagnus Karlsson !dev->netdev_ops->ndo_xsk_async_xmit) { 110c9b47cc1SMagnus Karlsson err = -EOPNOTSUPP; 111c9b47cc1SMagnus Karlsson goto err_unreg_umem; 11284c6b868SJakub Kicinski } 113173d3adbSBjörn Töpel 114173d3adbSBjörn Töpel bpf.command = XDP_SETUP_XSK_UMEM; 115173d3adbSBjörn Töpel bpf.xsk.umem = umem; 116173d3adbSBjörn Töpel bpf.xsk.queue_id = queue_id; 117173d3adbSBjörn Töpel 118173d3adbSBjörn Töpel err = dev->netdev_ops->ndo_bpf(dev, &bpf); 119f734607eSJakub Kicinski if (err) 120c9b47cc1SMagnus Karlsson goto err_unreg_umem; 12184c6b868SJakub Kicinski rtnl_unlock(); 122173d3adbSBjörn Töpel 123f734607eSJakub Kicinski dev_hold(dev); 124173d3adbSBjörn Töpel umem->zc = true; 125173d3adbSBjörn Töpel return 0; 12684c6b868SJakub Kicinski 127c9b47cc1SMagnus Karlsson err_unreg_umem: 128c9b47cc1SMagnus Karlsson if (!force_zc) 129c9b47cc1SMagnus Karlsson err = 0; /* fallback to copy mode */ 130*1e405c1aSBjörn Töpel if (err) 131*1e405c1aSBjörn Töpel xdp_clear_umem_at_qid(dev, queue_id); 132c9b47cc1SMagnus Karlsson out_rtnl_unlock: 13384c6b868SJakub Kicinski rtnl_unlock(); 134c9b47cc1SMagnus Karlsson return err; 135173d3adbSBjörn Töpel } 136173d3adbSBjörn Töpel 137ac98d8aaSMagnus Karlsson static void xdp_umem_clear_dev(struct xdp_umem *umem) 138173d3adbSBjörn Töpel { 139173d3adbSBjörn Töpel struct netdev_bpf bpf; 140173d3adbSBjörn Töpel int err; 141173d3adbSBjörn Töpel 142c9b47cc1SMagnus Karlsson if (umem->zc) { 143173d3adbSBjörn Töpel bpf.command = XDP_SETUP_XSK_UMEM; 144173d3adbSBjörn Töpel bpf.xsk.umem = NULL; 145173d3adbSBjörn Töpel bpf.xsk.queue_id = umem->queue_id; 146173d3adbSBjörn Töpel 147173d3adbSBjörn Töpel rtnl_lock(); 148173d3adbSBjörn Töpel err = umem->dev->netdev_ops->ndo_bpf(umem->dev, &bpf); 149173d3adbSBjörn Töpel rtnl_unlock(); 150173d3adbSBjörn Töpel 151173d3adbSBjörn Töpel if (err) 152173d3adbSBjörn Töpel WARN(1, "failed to disable umem!\n"); 153c9b47cc1SMagnus Karlsson } 154173d3adbSBjörn Töpel 155c9b47cc1SMagnus Karlsson if (umem->dev) { 156c9b47cc1SMagnus Karlsson rtnl_lock(); 157c9b47cc1SMagnus Karlsson xdp_clear_umem_at_qid(umem->dev, umem->queue_id); 158c9b47cc1SMagnus Karlsson rtnl_unlock(); 159c9b47cc1SMagnus Karlsson } 160c9b47cc1SMagnus Karlsson 161c9b47cc1SMagnus Karlsson if (umem->zc) { 162173d3adbSBjörn Töpel dev_put(umem->dev); 163c9b47cc1SMagnus Karlsson umem->zc = false; 164173d3adbSBjörn Töpel } 165173d3adbSBjörn Töpel } 166173d3adbSBjörn Töpel 167c0c77d8fSBjörn Töpel static void xdp_umem_unpin_pages(struct xdp_umem *umem) 168c0c77d8fSBjörn Töpel { 169c0c77d8fSBjörn Töpel unsigned int i; 170c0c77d8fSBjörn Töpel 171c0c77d8fSBjörn Töpel for (i = 0; i < umem->npgs; i++) { 172c0c77d8fSBjörn Töpel struct page *page = umem->pgs[i]; 173c0c77d8fSBjörn Töpel 174c0c77d8fSBjörn Töpel set_page_dirty_lock(page); 175c0c77d8fSBjörn Töpel put_page(page); 176c0c77d8fSBjörn Töpel } 177c0c77d8fSBjörn Töpel 178c0c77d8fSBjörn Töpel kfree(umem->pgs); 179c0c77d8fSBjörn Töpel umem->pgs = NULL; 180c0c77d8fSBjörn Töpel } 181c0c77d8fSBjörn Töpel 182c0c77d8fSBjörn Töpel static void xdp_umem_unaccount_pages(struct xdp_umem *umem) 183c0c77d8fSBjörn Töpel { 184c09290c5SDaniel Borkmann if (umem->user) { 185c0c77d8fSBjörn Töpel atomic_long_sub(umem->npgs, &umem->user->locked_vm); 186c0c77d8fSBjörn Töpel free_uid(umem->user); 187c0c77d8fSBjörn Töpel } 188c09290c5SDaniel Borkmann } 189c0c77d8fSBjörn Töpel 190c0c77d8fSBjörn Töpel static void xdp_umem_release(struct xdp_umem *umem) 191c0c77d8fSBjörn Töpel { 192c0c77d8fSBjörn Töpel struct task_struct *task; 193c0c77d8fSBjörn Töpel struct mm_struct *mm; 194c0c77d8fSBjörn Töpel 195173d3adbSBjörn Töpel xdp_umem_clear_dev(umem); 196173d3adbSBjörn Töpel 197423f3832SMagnus Karlsson if (umem->fq) { 198423f3832SMagnus Karlsson xskq_destroy(umem->fq); 199423f3832SMagnus Karlsson umem->fq = NULL; 200423f3832SMagnus Karlsson } 201423f3832SMagnus Karlsson 202fe230832SMagnus Karlsson if (umem->cq) { 203fe230832SMagnus Karlsson xskq_destroy(umem->cq); 204fe230832SMagnus Karlsson umem->cq = NULL; 205fe230832SMagnus Karlsson } 206fe230832SMagnus Karlsson 207f5bd9138SJakub Kicinski xsk_reuseq_destroy(umem); 208f5bd9138SJakub Kicinski 209c0c77d8fSBjörn Töpel xdp_umem_unpin_pages(umem); 210c0c77d8fSBjörn Töpel 211c0c77d8fSBjörn Töpel task = get_pid_task(umem->pid, PIDTYPE_PID); 212c0c77d8fSBjörn Töpel put_pid(umem->pid); 213c0c77d8fSBjörn Töpel if (!task) 214c0c77d8fSBjörn Töpel goto out; 215c0c77d8fSBjörn Töpel mm = get_task_mm(task); 216c0c77d8fSBjörn Töpel put_task_struct(task); 217c0c77d8fSBjörn Töpel if (!mm) 218c0c77d8fSBjörn Töpel goto out; 219c0c77d8fSBjörn Töpel 220c0c77d8fSBjörn Töpel mmput(mm); 2218aef7340SBjörn Töpel kfree(umem->pages); 2228aef7340SBjörn Töpel umem->pages = NULL; 2238aef7340SBjörn Töpel 224c0c77d8fSBjörn Töpel xdp_umem_unaccount_pages(umem); 225c0c77d8fSBjörn Töpel out: 226c0c77d8fSBjörn Töpel kfree(umem); 227c0c77d8fSBjörn Töpel } 228c0c77d8fSBjörn Töpel 229c0c77d8fSBjörn Töpel static void xdp_umem_release_deferred(struct work_struct *work) 230c0c77d8fSBjörn Töpel { 231c0c77d8fSBjörn Töpel struct xdp_umem *umem = container_of(work, struct xdp_umem, work); 232c0c77d8fSBjörn Töpel 233c0c77d8fSBjörn Töpel xdp_umem_release(umem); 234c0c77d8fSBjörn Töpel } 235c0c77d8fSBjörn Töpel 236c0c77d8fSBjörn Töpel void xdp_get_umem(struct xdp_umem *umem) 237c0c77d8fSBjörn Töpel { 238d3b42f14SBjörn Töpel refcount_inc(&umem->users); 239c0c77d8fSBjörn Töpel } 240c0c77d8fSBjörn Töpel 241c0c77d8fSBjörn Töpel void xdp_put_umem(struct xdp_umem *umem) 242c0c77d8fSBjörn Töpel { 243c0c77d8fSBjörn Töpel if (!umem) 244c0c77d8fSBjörn Töpel return; 245c0c77d8fSBjörn Töpel 246d3b42f14SBjörn Töpel if (refcount_dec_and_test(&umem->users)) { 247c0c77d8fSBjörn Töpel INIT_WORK(&umem->work, xdp_umem_release_deferred); 248c0c77d8fSBjörn Töpel schedule_work(&umem->work); 249c0c77d8fSBjörn Töpel } 250c0c77d8fSBjörn Töpel } 251c0c77d8fSBjörn Töpel 252c0c77d8fSBjörn Töpel static int xdp_umem_pin_pages(struct xdp_umem *umem) 253c0c77d8fSBjörn Töpel { 254c0c77d8fSBjörn Töpel unsigned int gup_flags = FOLL_WRITE; 255c0c77d8fSBjörn Töpel long npgs; 256c0c77d8fSBjörn Töpel int err; 257c0c77d8fSBjörn Töpel 258a343993cSBjörn Töpel umem->pgs = kcalloc(umem->npgs, sizeof(*umem->pgs), 259a343993cSBjörn Töpel GFP_KERNEL | __GFP_NOWARN); 260c0c77d8fSBjörn Töpel if (!umem->pgs) 261c0c77d8fSBjörn Töpel return -ENOMEM; 262c0c77d8fSBjörn Töpel 263e451eb51SDavidlohr Bueso down_read(¤t->mm->mmap_sem); 264e451eb51SDavidlohr Bueso npgs = get_user_pages_longterm(umem->address, umem->npgs, 265c0c77d8fSBjörn Töpel gup_flags, &umem->pgs[0], NULL); 266e451eb51SDavidlohr Bueso up_read(¤t->mm->mmap_sem); 267c0c77d8fSBjörn Töpel 268c0c77d8fSBjörn Töpel if (npgs != umem->npgs) { 269c0c77d8fSBjörn Töpel if (npgs >= 0) { 270c0c77d8fSBjörn Töpel umem->npgs = npgs; 271c0c77d8fSBjörn Töpel err = -ENOMEM; 272c0c77d8fSBjörn Töpel goto out_pin; 273c0c77d8fSBjörn Töpel } 274c0c77d8fSBjörn Töpel err = npgs; 275c0c77d8fSBjörn Töpel goto out_pgs; 276c0c77d8fSBjörn Töpel } 277c0c77d8fSBjörn Töpel return 0; 278c0c77d8fSBjörn Töpel 279c0c77d8fSBjörn Töpel out_pin: 280c0c77d8fSBjörn Töpel xdp_umem_unpin_pages(umem); 281c0c77d8fSBjörn Töpel out_pgs: 282c0c77d8fSBjörn Töpel kfree(umem->pgs); 283c0c77d8fSBjörn Töpel umem->pgs = NULL; 284c0c77d8fSBjörn Töpel return err; 285c0c77d8fSBjörn Töpel } 286c0c77d8fSBjörn Töpel 287c0c77d8fSBjörn Töpel static int xdp_umem_account_pages(struct xdp_umem *umem) 288c0c77d8fSBjörn Töpel { 289c0c77d8fSBjörn Töpel unsigned long lock_limit, new_npgs, old_npgs; 290c0c77d8fSBjörn Töpel 291c0c77d8fSBjörn Töpel if (capable(CAP_IPC_LOCK)) 292c0c77d8fSBjörn Töpel return 0; 293c0c77d8fSBjörn Töpel 294c0c77d8fSBjörn Töpel lock_limit = rlimit(RLIMIT_MEMLOCK) >> PAGE_SHIFT; 295c0c77d8fSBjörn Töpel umem->user = get_uid(current_user()); 296c0c77d8fSBjörn Töpel 297c0c77d8fSBjörn Töpel do { 298c0c77d8fSBjörn Töpel old_npgs = atomic_long_read(&umem->user->locked_vm); 299c0c77d8fSBjörn Töpel new_npgs = old_npgs + umem->npgs; 300c0c77d8fSBjörn Töpel if (new_npgs > lock_limit) { 301c0c77d8fSBjörn Töpel free_uid(umem->user); 302c0c77d8fSBjörn Töpel umem->user = NULL; 303c0c77d8fSBjörn Töpel return -ENOBUFS; 304c0c77d8fSBjörn Töpel } 305c0c77d8fSBjörn Töpel } while (atomic_long_cmpxchg(&umem->user->locked_vm, old_npgs, 306c0c77d8fSBjörn Töpel new_npgs) != old_npgs); 307c0c77d8fSBjörn Töpel return 0; 308c0c77d8fSBjörn Töpel } 309c0c77d8fSBjörn Töpel 310a49049eaSBjörn Töpel static int xdp_umem_reg(struct xdp_umem *umem, struct xdp_umem_reg *mr) 311c0c77d8fSBjörn Töpel { 312bbff2f32SBjörn Töpel u32 chunk_size = mr->chunk_size, headroom = mr->headroom; 313bbff2f32SBjörn Töpel unsigned int chunks, chunks_per_page; 314c0c77d8fSBjörn Töpel u64 addr = mr->addr, size = mr->len; 3158aef7340SBjörn Töpel int size_chk, err, i; 316c0c77d8fSBjörn Töpel 317bbff2f32SBjörn Töpel if (chunk_size < XDP_UMEM_MIN_CHUNK_SIZE || chunk_size > PAGE_SIZE) { 318c0c77d8fSBjörn Töpel /* Strictly speaking we could support this, if: 319c0c77d8fSBjörn Töpel * - huge pages, or* 320c0c77d8fSBjörn Töpel * - using an IOMMU, or 321c0c77d8fSBjörn Töpel * - making sure the memory area is consecutive 322c0c77d8fSBjörn Töpel * but for now, we simply say "computer says no". 323c0c77d8fSBjörn Töpel */ 324c0c77d8fSBjörn Töpel return -EINVAL; 325c0c77d8fSBjörn Töpel } 326c0c77d8fSBjörn Töpel 327bbff2f32SBjörn Töpel if (!is_power_of_2(chunk_size)) 328c0c77d8fSBjörn Töpel return -EINVAL; 329c0c77d8fSBjörn Töpel 330c0c77d8fSBjörn Töpel if (!PAGE_ALIGNED(addr)) { 331c0c77d8fSBjörn Töpel /* Memory area has to be page size aligned. For 332c0c77d8fSBjörn Töpel * simplicity, this might change. 333c0c77d8fSBjörn Töpel */ 334c0c77d8fSBjörn Töpel return -EINVAL; 335c0c77d8fSBjörn Töpel } 336c0c77d8fSBjörn Töpel 337c0c77d8fSBjörn Töpel if ((addr + size) < addr) 338c0c77d8fSBjörn Töpel return -EINVAL; 339c0c77d8fSBjörn Töpel 340bbff2f32SBjörn Töpel chunks = (unsigned int)div_u64(size, chunk_size); 341bbff2f32SBjörn Töpel if (chunks == 0) 342c0c77d8fSBjörn Töpel return -EINVAL; 343c0c77d8fSBjörn Töpel 344bbff2f32SBjörn Töpel chunks_per_page = PAGE_SIZE / chunk_size; 345bbff2f32SBjörn Töpel if (chunks < chunks_per_page || chunks % chunks_per_page) 346c0c77d8fSBjörn Töpel return -EINVAL; 347c0c77d8fSBjörn Töpel 348bbff2f32SBjörn Töpel headroom = ALIGN(headroom, 64); 349c0c77d8fSBjörn Töpel 350bbff2f32SBjörn Töpel size_chk = chunk_size - headroom - XDP_PACKET_HEADROOM; 351c0c77d8fSBjörn Töpel if (size_chk < 0) 352c0c77d8fSBjörn Töpel return -EINVAL; 353c0c77d8fSBjörn Töpel 354c0c77d8fSBjörn Töpel umem->pid = get_task_pid(current, PIDTYPE_PID); 355c0c77d8fSBjörn Töpel umem->address = (unsigned long)addr; 35693ee30f3SMagnus Karlsson umem->chunk_mask = ~((u64)chunk_size - 1); 35793ee30f3SMagnus Karlsson umem->size = size; 358bbff2f32SBjörn Töpel umem->headroom = headroom; 359bbff2f32SBjörn Töpel umem->chunk_size_nohr = chunk_size - headroom; 360c0c77d8fSBjörn Töpel umem->npgs = size / PAGE_SIZE; 361c0c77d8fSBjörn Töpel umem->pgs = NULL; 362c0c77d8fSBjörn Töpel umem->user = NULL; 363ac98d8aaSMagnus Karlsson INIT_LIST_HEAD(&umem->xsk_list); 364ac98d8aaSMagnus Karlsson spin_lock_init(&umem->xsk_list_lock); 365c0c77d8fSBjörn Töpel 366d3b42f14SBjörn Töpel refcount_set(&umem->users, 1); 367c0c77d8fSBjörn Töpel 368c0c77d8fSBjörn Töpel err = xdp_umem_account_pages(umem); 369c0c77d8fSBjörn Töpel if (err) 370c0c77d8fSBjörn Töpel goto out; 371c0c77d8fSBjörn Töpel 372c0c77d8fSBjörn Töpel err = xdp_umem_pin_pages(umem); 373c0c77d8fSBjörn Töpel if (err) 374c0c77d8fSBjörn Töpel goto out_account; 3758aef7340SBjörn Töpel 3768aef7340SBjörn Töpel umem->pages = kcalloc(umem->npgs, sizeof(*umem->pages), GFP_KERNEL); 3778aef7340SBjörn Töpel if (!umem->pages) { 3788aef7340SBjörn Töpel err = -ENOMEM; 3798aef7340SBjörn Töpel goto out_account; 3808aef7340SBjörn Töpel } 3818aef7340SBjörn Töpel 3828aef7340SBjörn Töpel for (i = 0; i < umem->npgs; i++) 3838aef7340SBjörn Töpel umem->pages[i].addr = page_address(umem->pgs[i]); 3848aef7340SBjörn Töpel 385c0c77d8fSBjörn Töpel return 0; 386c0c77d8fSBjörn Töpel 387c0c77d8fSBjörn Töpel out_account: 388c0c77d8fSBjörn Töpel xdp_umem_unaccount_pages(umem); 389c0c77d8fSBjörn Töpel out: 390c0c77d8fSBjörn Töpel put_pid(umem->pid); 391c0c77d8fSBjörn Töpel return err; 392c0c77d8fSBjörn Töpel } 393965a9909SMagnus Karlsson 394a49049eaSBjörn Töpel struct xdp_umem *xdp_umem_create(struct xdp_umem_reg *mr) 395a49049eaSBjörn Töpel { 396a49049eaSBjörn Töpel struct xdp_umem *umem; 397a49049eaSBjörn Töpel int err; 398a49049eaSBjörn Töpel 399a49049eaSBjörn Töpel umem = kzalloc(sizeof(*umem), GFP_KERNEL); 400a49049eaSBjörn Töpel if (!umem) 401a49049eaSBjörn Töpel return ERR_PTR(-ENOMEM); 402a49049eaSBjörn Töpel 403a49049eaSBjörn Töpel err = xdp_umem_reg(umem, mr); 404a49049eaSBjörn Töpel if (err) { 405a49049eaSBjörn Töpel kfree(umem); 406a49049eaSBjörn Töpel return ERR_PTR(err); 407a49049eaSBjörn Töpel } 408a49049eaSBjörn Töpel 409a49049eaSBjörn Töpel return umem; 410a49049eaSBjörn Töpel } 411a49049eaSBjörn Töpel 412965a9909SMagnus Karlsson bool xdp_umem_validate_queues(struct xdp_umem *umem) 413965a9909SMagnus Karlsson { 414da60cf00SBjörn Töpel return umem->fq && umem->cq; 415965a9909SMagnus Karlsson } 416