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> 1650e74c01SBjörn Töpel #include <linux/idr.h> 17*d9973cecSIvan Khoronzhuk #include <linux/highmem.h> 18c0c77d8fSBjörn Töpel 19c0c77d8fSBjörn Töpel #include "xdp_umem.h" 20e61e62b9SBjörn Töpel #include "xsk_queue.h" 21c0c77d8fSBjörn Töpel 22bbff2f32SBjörn Töpel #define XDP_UMEM_MIN_CHUNK_SIZE 2048 23c0c77d8fSBjörn Töpel 2450e74c01SBjörn Töpel static DEFINE_IDA(umem_ida); 2550e74c01SBjörn Töpel 26ac98d8aaSMagnus Karlsson void xdp_add_sk_umem(struct xdp_umem *umem, struct xdp_sock *xs) 27ac98d8aaSMagnus Karlsson { 28ac98d8aaSMagnus Karlsson unsigned long flags; 29ac98d8aaSMagnus Karlsson 30ac98d8aaSMagnus Karlsson spin_lock_irqsave(&umem->xsk_list_lock, flags); 31ac98d8aaSMagnus Karlsson list_add_rcu(&xs->list, &umem->xsk_list); 32ac98d8aaSMagnus Karlsson spin_unlock_irqrestore(&umem->xsk_list_lock, flags); 33ac98d8aaSMagnus Karlsson } 34ac98d8aaSMagnus Karlsson 35ac98d8aaSMagnus Karlsson void xdp_del_sk_umem(struct xdp_umem *umem, struct xdp_sock *xs) 36ac98d8aaSMagnus Karlsson { 37ac98d8aaSMagnus Karlsson unsigned long flags; 38ac98d8aaSMagnus Karlsson 39ac98d8aaSMagnus Karlsson spin_lock_irqsave(&umem->xsk_list_lock, flags); 40ac98d8aaSMagnus Karlsson list_del_rcu(&xs->list); 41ac98d8aaSMagnus Karlsson spin_unlock_irqrestore(&umem->xsk_list_lock, flags); 42ac98d8aaSMagnus Karlsson } 43ac98d8aaSMagnus Karlsson 44c9b47cc1SMagnus Karlsson /* The umem is stored both in the _rx struct and the _tx struct as we do 45c9b47cc1SMagnus Karlsson * not know if the device has more tx queues than rx, or the opposite. 46c9b47cc1SMagnus Karlsson * This might also change during run time. 47c9b47cc1SMagnus Karlsson */ 48cc5b5d35SKrzysztof Kazimierczak static int xdp_reg_umem_at_qid(struct net_device *dev, struct xdp_umem *umem, 49c9b47cc1SMagnus Karlsson u16 queue_id) 5084c6b868SJakub Kicinski { 51cc5b5d35SKrzysztof Kazimierczak if (queue_id >= max_t(unsigned int, 52cc5b5d35SKrzysztof Kazimierczak dev->real_num_rx_queues, 53cc5b5d35SKrzysztof Kazimierczak dev->real_num_tx_queues)) 54cc5b5d35SKrzysztof Kazimierczak return -EINVAL; 55cc5b5d35SKrzysztof Kazimierczak 56c9b47cc1SMagnus Karlsson if (queue_id < dev->real_num_rx_queues) 57c9b47cc1SMagnus Karlsson dev->_rx[queue_id].umem = umem; 58c9b47cc1SMagnus Karlsson if (queue_id < dev->real_num_tx_queues) 59c9b47cc1SMagnus Karlsson dev->_tx[queue_id].umem = umem; 60cc5b5d35SKrzysztof Kazimierczak 61cc5b5d35SKrzysztof Kazimierczak return 0; 62c9b47cc1SMagnus Karlsson } 6384c6b868SJakub Kicinski 641661d346SJakub Kicinski struct xdp_umem *xdp_get_umem_from_qid(struct net_device *dev, 65c9b47cc1SMagnus Karlsson u16 queue_id) 66c9b47cc1SMagnus Karlsson { 67c9b47cc1SMagnus Karlsson if (queue_id < dev->real_num_rx_queues) 68c9b47cc1SMagnus Karlsson return dev->_rx[queue_id].umem; 69c9b47cc1SMagnus Karlsson if (queue_id < dev->real_num_tx_queues) 70c9b47cc1SMagnus Karlsson return dev->_tx[queue_id].umem; 7184c6b868SJakub Kicinski 72c9b47cc1SMagnus Karlsson return NULL; 73c9b47cc1SMagnus Karlsson } 745f4f3b2dSJan Sokolowski EXPORT_SYMBOL(xdp_get_umem_from_qid); 7584c6b868SJakub Kicinski 76c9b47cc1SMagnus Karlsson static void xdp_clear_umem_at_qid(struct net_device *dev, u16 queue_id) 77c9b47cc1SMagnus Karlsson { 78a41b4f3cSMagnus Karlsson if (queue_id < dev->real_num_rx_queues) 79c9b47cc1SMagnus Karlsson dev->_rx[queue_id].umem = NULL; 80a41b4f3cSMagnus Karlsson if (queue_id < dev->real_num_tx_queues) 81c9b47cc1SMagnus Karlsson dev->_tx[queue_id].umem = NULL; 8284c6b868SJakub Kicinski } 8384c6b868SJakub Kicinski 84173d3adbSBjörn Töpel int xdp_umem_assign_dev(struct xdp_umem *umem, struct net_device *dev, 85c9b47cc1SMagnus Karlsson u16 queue_id, u16 flags) 86173d3adbSBjörn Töpel { 87173d3adbSBjörn Töpel bool force_zc, force_copy; 88173d3adbSBjörn Töpel struct netdev_bpf bpf; 89c9b47cc1SMagnus Karlsson int err = 0; 90173d3adbSBjörn Töpel 915464c3a0SIlya Maximets ASSERT_RTNL(); 925464c3a0SIlya Maximets 93173d3adbSBjörn Töpel force_zc = flags & XDP_ZEROCOPY; 94173d3adbSBjörn Töpel force_copy = flags & XDP_COPY; 95173d3adbSBjörn Töpel 96173d3adbSBjörn Töpel if (force_zc && force_copy) 97173d3adbSBjörn Töpel return -EINVAL; 98173d3adbSBjörn Töpel 995464c3a0SIlya Maximets if (xdp_get_umem_from_qid(dev, queue_id)) 1005464c3a0SIlya Maximets return -EBUSY; 101c9b47cc1SMagnus Karlsson 102cc5b5d35SKrzysztof Kazimierczak err = xdp_reg_umem_at_qid(dev, umem, queue_id); 103cc5b5d35SKrzysztof Kazimierczak if (err) 1045464c3a0SIlya Maximets return err; 105cc5b5d35SKrzysztof Kazimierczak 106c9b47cc1SMagnus Karlsson umem->dev = dev; 107c9b47cc1SMagnus Karlsson umem->queue_id = queue_id; 108162c820eSIlya Maximets 109162c820eSIlya Maximets dev_hold(dev); 110162c820eSIlya Maximets 111c9b47cc1SMagnus Karlsson if (force_copy) 112c9b47cc1SMagnus Karlsson /* For copy-mode, we are done. */ 1135464c3a0SIlya Maximets return 0; 114c9b47cc1SMagnus Karlsson 115c9b47cc1SMagnus Karlsson if (!dev->netdev_ops->ndo_bpf || 116c9b47cc1SMagnus Karlsson !dev->netdev_ops->ndo_xsk_async_xmit) { 117c9b47cc1SMagnus Karlsson err = -EOPNOTSUPP; 118c9b47cc1SMagnus Karlsson goto err_unreg_umem; 11984c6b868SJakub Kicinski } 120173d3adbSBjörn Töpel 121173d3adbSBjörn Töpel bpf.command = XDP_SETUP_XSK_UMEM; 122173d3adbSBjörn Töpel bpf.xsk.umem = umem; 123173d3adbSBjörn Töpel bpf.xsk.queue_id = queue_id; 124173d3adbSBjörn Töpel 125173d3adbSBjörn Töpel err = dev->netdev_ops->ndo_bpf(dev, &bpf); 126f734607eSJakub Kicinski if (err) 127c9b47cc1SMagnus Karlsson goto err_unreg_umem; 128173d3adbSBjörn Töpel 129173d3adbSBjörn Töpel umem->zc = true; 130173d3adbSBjörn Töpel return 0; 13184c6b868SJakub Kicinski 132c9b47cc1SMagnus Karlsson err_unreg_umem: 133c9b47cc1SMagnus Karlsson if (!force_zc) 134c9b47cc1SMagnus Karlsson err = 0; /* fallback to copy mode */ 1351e405c1aSBjörn Töpel if (err) 1361e405c1aSBjörn Töpel xdp_clear_umem_at_qid(dev, queue_id); 137c9b47cc1SMagnus Karlsson return err; 138173d3adbSBjörn Töpel } 139173d3adbSBjörn Töpel 140455302d1SIlya Maximets void xdp_umem_clear_dev(struct xdp_umem *umem) 141173d3adbSBjörn Töpel { 142173d3adbSBjörn Töpel struct netdev_bpf bpf; 143173d3adbSBjörn Töpel int err; 144173d3adbSBjörn Töpel 145455302d1SIlya Maximets ASSERT_RTNL(); 146455302d1SIlya Maximets 14701d76b53SIlya Maximets if (!umem->dev) 14801d76b53SIlya Maximets return; 14901d76b53SIlya Maximets 150c9b47cc1SMagnus Karlsson if (umem->zc) { 151173d3adbSBjörn Töpel bpf.command = XDP_SETUP_XSK_UMEM; 152173d3adbSBjörn Töpel bpf.xsk.umem = NULL; 153173d3adbSBjörn Töpel bpf.xsk.queue_id = umem->queue_id; 154173d3adbSBjörn Töpel 155173d3adbSBjörn Töpel err = umem->dev->netdev_ops->ndo_bpf(umem->dev, &bpf); 156173d3adbSBjörn Töpel 157173d3adbSBjörn Töpel if (err) 158173d3adbSBjörn Töpel WARN(1, "failed to disable umem!\n"); 159c9b47cc1SMagnus Karlsson } 160173d3adbSBjörn Töpel 161c9b47cc1SMagnus Karlsson xdp_clear_umem_at_qid(umem->dev, umem->queue_id); 162c9b47cc1SMagnus Karlsson 163173d3adbSBjörn Töpel dev_put(umem->dev); 164162c820eSIlya Maximets umem->dev = NULL; 165c9b47cc1SMagnus Karlsson umem->zc = false; 166173d3adbSBjörn Töpel } 167173d3adbSBjörn Töpel 168*d9973cecSIvan Khoronzhuk static void xdp_umem_unmap_pages(struct xdp_umem *umem) 169*d9973cecSIvan Khoronzhuk { 170*d9973cecSIvan Khoronzhuk unsigned int i; 171*d9973cecSIvan Khoronzhuk 172*d9973cecSIvan Khoronzhuk for (i = 0; i < umem->npgs; i++) 173*d9973cecSIvan Khoronzhuk kunmap(umem->pgs[i]); 174*d9973cecSIvan Khoronzhuk } 175*d9973cecSIvan Khoronzhuk 176c0c77d8fSBjörn Töpel static void xdp_umem_unpin_pages(struct xdp_umem *umem) 177c0c77d8fSBjörn Töpel { 178c0c77d8fSBjörn Töpel unsigned int i; 179c0c77d8fSBjörn Töpel 180c0c77d8fSBjörn Töpel for (i = 0; i < umem->npgs; i++) { 181c0c77d8fSBjörn Töpel struct page *page = umem->pgs[i]; 182c0c77d8fSBjörn Töpel 183c0c77d8fSBjörn Töpel set_page_dirty_lock(page); 184c0c77d8fSBjörn Töpel put_page(page); 185c0c77d8fSBjörn Töpel } 186c0c77d8fSBjörn Töpel 187c0c77d8fSBjörn Töpel kfree(umem->pgs); 188c0c77d8fSBjörn Töpel umem->pgs = NULL; 189c0c77d8fSBjörn Töpel } 190c0c77d8fSBjörn Töpel 191c0c77d8fSBjörn Töpel static void xdp_umem_unaccount_pages(struct xdp_umem *umem) 192c0c77d8fSBjörn Töpel { 193c09290c5SDaniel Borkmann if (umem->user) { 194c0c77d8fSBjörn Töpel atomic_long_sub(umem->npgs, &umem->user->locked_vm); 195c0c77d8fSBjörn Töpel free_uid(umem->user); 196c0c77d8fSBjörn Töpel } 197c09290c5SDaniel Borkmann } 198c0c77d8fSBjörn Töpel 199c0c77d8fSBjörn Töpel static void xdp_umem_release(struct xdp_umem *umem) 200c0c77d8fSBjörn Töpel { 201455302d1SIlya Maximets rtnl_lock(); 202173d3adbSBjörn Töpel xdp_umem_clear_dev(umem); 203455302d1SIlya Maximets rtnl_unlock(); 204173d3adbSBjörn Töpel 20550e74c01SBjörn Töpel ida_simple_remove(&umem_ida, umem->id); 20650e74c01SBjörn Töpel 207423f3832SMagnus Karlsson if (umem->fq) { 208423f3832SMagnus Karlsson xskq_destroy(umem->fq); 209423f3832SMagnus Karlsson umem->fq = NULL; 210423f3832SMagnus Karlsson } 211423f3832SMagnus Karlsson 212fe230832SMagnus Karlsson if (umem->cq) { 213fe230832SMagnus Karlsson xskq_destroy(umem->cq); 214fe230832SMagnus Karlsson umem->cq = NULL; 215fe230832SMagnus Karlsson } 216fe230832SMagnus Karlsson 217f5bd9138SJakub Kicinski xsk_reuseq_destroy(umem); 218f5bd9138SJakub Kicinski 219*d9973cecSIvan Khoronzhuk xdp_umem_unmap_pages(umem); 220c0c77d8fSBjörn Töpel xdp_umem_unpin_pages(umem); 221c0c77d8fSBjörn Töpel 2228aef7340SBjörn Töpel kfree(umem->pages); 2238aef7340SBjörn Töpel umem->pages = NULL; 2248aef7340SBjörn Töpel 225c0c77d8fSBjörn Töpel xdp_umem_unaccount_pages(umem); 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); 264932f4a63SIra Weiny npgs = get_user_pages(umem->address, umem->npgs, 265932f4a63SIra Weiny gup_flags | FOLL_LONGTERM, &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->address = (unsigned long)addr; 35593ee30f3SMagnus Karlsson umem->chunk_mask = ~((u64)chunk_size - 1); 35693ee30f3SMagnus Karlsson umem->size = size; 357bbff2f32SBjörn Töpel umem->headroom = headroom; 358bbff2f32SBjörn Töpel umem->chunk_size_nohr = chunk_size - headroom; 359c0c77d8fSBjörn Töpel umem->npgs = size / PAGE_SIZE; 360c0c77d8fSBjörn Töpel umem->pgs = NULL; 361c0c77d8fSBjörn Töpel umem->user = NULL; 362ac98d8aaSMagnus Karlsson INIT_LIST_HEAD(&umem->xsk_list); 363ac98d8aaSMagnus Karlsson spin_lock_init(&umem->xsk_list_lock); 364c0c77d8fSBjörn Töpel 365d3b42f14SBjörn Töpel refcount_set(&umem->users, 1); 366c0c77d8fSBjörn Töpel 367c0c77d8fSBjörn Töpel err = xdp_umem_account_pages(umem); 368c0c77d8fSBjörn Töpel if (err) 369044175a0SBjörn Töpel return err; 370c0c77d8fSBjörn Töpel 371c0c77d8fSBjörn Töpel err = xdp_umem_pin_pages(umem); 372c0c77d8fSBjörn Töpel if (err) 373c0c77d8fSBjörn Töpel goto out_account; 3748aef7340SBjörn Töpel 3758aef7340SBjörn Töpel umem->pages = kcalloc(umem->npgs, sizeof(*umem->pages), GFP_KERNEL); 3768aef7340SBjörn Töpel if (!umem->pages) { 3778aef7340SBjörn Töpel err = -ENOMEM; 3788aef7340SBjörn Töpel goto out_account; 3798aef7340SBjörn Töpel } 3808aef7340SBjörn Töpel 3818aef7340SBjörn Töpel for (i = 0; i < umem->npgs; i++) 382*d9973cecSIvan Khoronzhuk umem->pages[i].addr = kmap(umem->pgs[i]); 3838aef7340SBjörn Töpel 384c0c77d8fSBjörn Töpel return 0; 385c0c77d8fSBjörn Töpel 386c0c77d8fSBjörn Töpel out_account: 387c0c77d8fSBjörn Töpel xdp_umem_unaccount_pages(umem); 388c0c77d8fSBjörn Töpel return err; 389c0c77d8fSBjörn Töpel } 390965a9909SMagnus Karlsson 391a49049eaSBjörn Töpel struct xdp_umem *xdp_umem_create(struct xdp_umem_reg *mr) 392a49049eaSBjörn Töpel { 393a49049eaSBjörn Töpel struct xdp_umem *umem; 394a49049eaSBjörn Töpel int err; 395a49049eaSBjörn Töpel 396a49049eaSBjörn Töpel umem = kzalloc(sizeof(*umem), GFP_KERNEL); 397a49049eaSBjörn Töpel if (!umem) 398a49049eaSBjörn Töpel return ERR_PTR(-ENOMEM); 399a49049eaSBjörn Töpel 40050e74c01SBjörn Töpel err = ida_simple_get(&umem_ida, 0, 0, GFP_KERNEL); 40150e74c01SBjörn Töpel if (err < 0) { 40250e74c01SBjörn Töpel kfree(umem); 40350e74c01SBjörn Töpel return ERR_PTR(err); 40450e74c01SBjörn Töpel } 40550e74c01SBjörn Töpel umem->id = err; 40650e74c01SBjörn Töpel 407a49049eaSBjörn Töpel err = xdp_umem_reg(umem, mr); 408a49049eaSBjörn Töpel if (err) { 40950e74c01SBjörn Töpel ida_simple_remove(&umem_ida, umem->id); 410a49049eaSBjörn Töpel kfree(umem); 411a49049eaSBjörn Töpel return ERR_PTR(err); 412a49049eaSBjörn Töpel } 413a49049eaSBjörn Töpel 414a49049eaSBjörn Töpel return umem; 415a49049eaSBjörn Töpel } 416a49049eaSBjörn Töpel 417965a9909SMagnus Karlsson bool xdp_umem_validate_queues(struct xdp_umem *umem) 418965a9909SMagnus Karlsson { 419da60cf00SBjörn Töpel return umem->fq && umem->cq; 420965a9909SMagnus Karlsson } 421