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> 17d9973cecSIvan 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 109*77cd0d7bSMagnus Karlsson if (flags & XDP_USE_NEED_WAKEUP) { 110*77cd0d7bSMagnus Karlsson umem->flags |= XDP_UMEM_USES_NEED_WAKEUP; 111*77cd0d7bSMagnus Karlsson /* Tx needs to be explicitly woken up the first time. 112*77cd0d7bSMagnus Karlsson * Also for supporting drivers that do not implement this 113*77cd0d7bSMagnus Karlsson * feature. They will always have to call sendto(). 114*77cd0d7bSMagnus Karlsson */ 115*77cd0d7bSMagnus Karlsson xsk_set_tx_need_wakeup(umem); 116*77cd0d7bSMagnus Karlsson } 117*77cd0d7bSMagnus Karlsson 118162c820eSIlya Maximets dev_hold(dev); 119162c820eSIlya Maximets 120c9b47cc1SMagnus Karlsson if (force_copy) 121c9b47cc1SMagnus Karlsson /* For copy-mode, we are done. */ 1225464c3a0SIlya Maximets return 0; 123c9b47cc1SMagnus Karlsson 1249116e5e2SMagnus Karlsson if (!dev->netdev_ops->ndo_bpf || !dev->netdev_ops->ndo_xsk_wakeup) { 125c9b47cc1SMagnus Karlsson err = -EOPNOTSUPP; 126c9b47cc1SMagnus Karlsson goto err_unreg_umem; 12784c6b868SJakub Kicinski } 128173d3adbSBjörn Töpel 129173d3adbSBjörn Töpel bpf.command = XDP_SETUP_XSK_UMEM; 130173d3adbSBjörn Töpel bpf.xsk.umem = umem; 131173d3adbSBjörn Töpel bpf.xsk.queue_id = queue_id; 132173d3adbSBjörn Töpel 133173d3adbSBjörn Töpel err = dev->netdev_ops->ndo_bpf(dev, &bpf); 134f734607eSJakub Kicinski if (err) 135c9b47cc1SMagnus Karlsson goto err_unreg_umem; 136173d3adbSBjörn Töpel 137173d3adbSBjörn Töpel umem->zc = true; 138173d3adbSBjörn Töpel return 0; 13984c6b868SJakub Kicinski 140c9b47cc1SMagnus Karlsson err_unreg_umem: 141c9b47cc1SMagnus Karlsson if (!force_zc) 142c9b47cc1SMagnus Karlsson err = 0; /* fallback to copy mode */ 1431e405c1aSBjörn Töpel if (err) 1441e405c1aSBjörn Töpel xdp_clear_umem_at_qid(dev, queue_id); 145c9b47cc1SMagnus Karlsson return err; 146173d3adbSBjörn Töpel } 147173d3adbSBjörn Töpel 148455302d1SIlya Maximets void xdp_umem_clear_dev(struct xdp_umem *umem) 149173d3adbSBjörn Töpel { 150173d3adbSBjörn Töpel struct netdev_bpf bpf; 151173d3adbSBjörn Töpel int err; 152173d3adbSBjörn Töpel 153455302d1SIlya Maximets ASSERT_RTNL(); 154455302d1SIlya Maximets 15501d76b53SIlya Maximets if (!umem->dev) 15601d76b53SIlya Maximets return; 15701d76b53SIlya Maximets 158c9b47cc1SMagnus Karlsson if (umem->zc) { 159173d3adbSBjörn Töpel bpf.command = XDP_SETUP_XSK_UMEM; 160173d3adbSBjörn Töpel bpf.xsk.umem = NULL; 161173d3adbSBjörn Töpel bpf.xsk.queue_id = umem->queue_id; 162173d3adbSBjörn Töpel 163173d3adbSBjörn Töpel err = umem->dev->netdev_ops->ndo_bpf(umem->dev, &bpf); 164173d3adbSBjörn Töpel 165173d3adbSBjörn Töpel if (err) 166173d3adbSBjörn Töpel WARN(1, "failed to disable umem!\n"); 167c9b47cc1SMagnus Karlsson } 168173d3adbSBjörn Töpel 169c9b47cc1SMagnus Karlsson xdp_clear_umem_at_qid(umem->dev, umem->queue_id); 170c9b47cc1SMagnus Karlsson 171173d3adbSBjörn Töpel dev_put(umem->dev); 172162c820eSIlya Maximets umem->dev = NULL; 173c9b47cc1SMagnus Karlsson umem->zc = false; 174173d3adbSBjörn Töpel } 175173d3adbSBjörn Töpel 176d9973cecSIvan Khoronzhuk static void xdp_umem_unmap_pages(struct xdp_umem *umem) 177d9973cecSIvan Khoronzhuk { 178d9973cecSIvan Khoronzhuk unsigned int i; 179d9973cecSIvan Khoronzhuk 180d9973cecSIvan Khoronzhuk for (i = 0; i < umem->npgs; i++) 181d9973cecSIvan Khoronzhuk kunmap(umem->pgs[i]); 182d9973cecSIvan Khoronzhuk } 183d9973cecSIvan Khoronzhuk 184c0c77d8fSBjörn Töpel static void xdp_umem_unpin_pages(struct xdp_umem *umem) 185c0c77d8fSBjörn Töpel { 186c0c77d8fSBjörn Töpel unsigned int i; 187c0c77d8fSBjörn Töpel 188c0c77d8fSBjörn Töpel for (i = 0; i < umem->npgs; i++) { 189c0c77d8fSBjörn Töpel struct page *page = umem->pgs[i]; 190c0c77d8fSBjörn Töpel 191c0c77d8fSBjörn Töpel set_page_dirty_lock(page); 192c0c77d8fSBjörn Töpel put_page(page); 193c0c77d8fSBjörn Töpel } 194c0c77d8fSBjörn Töpel 195c0c77d8fSBjörn Töpel kfree(umem->pgs); 196c0c77d8fSBjörn Töpel umem->pgs = NULL; 197c0c77d8fSBjörn Töpel } 198c0c77d8fSBjörn Töpel 199c0c77d8fSBjörn Töpel static void xdp_umem_unaccount_pages(struct xdp_umem *umem) 200c0c77d8fSBjörn Töpel { 201c09290c5SDaniel Borkmann if (umem->user) { 202c0c77d8fSBjörn Töpel atomic_long_sub(umem->npgs, &umem->user->locked_vm); 203c0c77d8fSBjörn Töpel free_uid(umem->user); 204c0c77d8fSBjörn Töpel } 205c09290c5SDaniel Borkmann } 206c0c77d8fSBjörn Töpel 207c0c77d8fSBjörn Töpel static void xdp_umem_release(struct xdp_umem *umem) 208c0c77d8fSBjörn Töpel { 209455302d1SIlya Maximets rtnl_lock(); 210173d3adbSBjörn Töpel xdp_umem_clear_dev(umem); 211455302d1SIlya Maximets rtnl_unlock(); 212173d3adbSBjörn Töpel 21350e74c01SBjörn Töpel ida_simple_remove(&umem_ida, umem->id); 21450e74c01SBjörn Töpel 215423f3832SMagnus Karlsson if (umem->fq) { 216423f3832SMagnus Karlsson xskq_destroy(umem->fq); 217423f3832SMagnus Karlsson umem->fq = NULL; 218423f3832SMagnus Karlsson } 219423f3832SMagnus Karlsson 220fe230832SMagnus Karlsson if (umem->cq) { 221fe230832SMagnus Karlsson xskq_destroy(umem->cq); 222fe230832SMagnus Karlsson umem->cq = NULL; 223fe230832SMagnus Karlsson } 224fe230832SMagnus Karlsson 225f5bd9138SJakub Kicinski xsk_reuseq_destroy(umem); 226f5bd9138SJakub Kicinski 227d9973cecSIvan Khoronzhuk xdp_umem_unmap_pages(umem); 228c0c77d8fSBjörn Töpel xdp_umem_unpin_pages(umem); 229c0c77d8fSBjörn Töpel 2308aef7340SBjörn Töpel kfree(umem->pages); 2318aef7340SBjörn Töpel umem->pages = NULL; 2328aef7340SBjörn Töpel 233c0c77d8fSBjörn Töpel xdp_umem_unaccount_pages(umem); 234c0c77d8fSBjörn Töpel kfree(umem); 235c0c77d8fSBjörn Töpel } 236c0c77d8fSBjörn Töpel 237c0c77d8fSBjörn Töpel static void xdp_umem_release_deferred(struct work_struct *work) 238c0c77d8fSBjörn Töpel { 239c0c77d8fSBjörn Töpel struct xdp_umem *umem = container_of(work, struct xdp_umem, work); 240c0c77d8fSBjörn Töpel 241c0c77d8fSBjörn Töpel xdp_umem_release(umem); 242c0c77d8fSBjörn Töpel } 243c0c77d8fSBjörn Töpel 244c0c77d8fSBjörn Töpel void xdp_get_umem(struct xdp_umem *umem) 245c0c77d8fSBjörn Töpel { 246d3b42f14SBjörn Töpel refcount_inc(&umem->users); 247c0c77d8fSBjörn Töpel } 248c0c77d8fSBjörn Töpel 249c0c77d8fSBjörn Töpel void xdp_put_umem(struct xdp_umem *umem) 250c0c77d8fSBjörn Töpel { 251c0c77d8fSBjörn Töpel if (!umem) 252c0c77d8fSBjörn Töpel return; 253c0c77d8fSBjörn Töpel 254d3b42f14SBjörn Töpel if (refcount_dec_and_test(&umem->users)) { 255c0c77d8fSBjörn Töpel INIT_WORK(&umem->work, xdp_umem_release_deferred); 256c0c77d8fSBjörn Töpel schedule_work(&umem->work); 257c0c77d8fSBjörn Töpel } 258c0c77d8fSBjörn Töpel } 259c0c77d8fSBjörn Töpel 260c0c77d8fSBjörn Töpel static int xdp_umem_pin_pages(struct xdp_umem *umem) 261c0c77d8fSBjörn Töpel { 262c0c77d8fSBjörn Töpel unsigned int gup_flags = FOLL_WRITE; 263c0c77d8fSBjörn Töpel long npgs; 264c0c77d8fSBjörn Töpel int err; 265c0c77d8fSBjörn Töpel 266a343993cSBjörn Töpel umem->pgs = kcalloc(umem->npgs, sizeof(*umem->pgs), 267a343993cSBjörn Töpel GFP_KERNEL | __GFP_NOWARN); 268c0c77d8fSBjörn Töpel if (!umem->pgs) 269c0c77d8fSBjörn Töpel return -ENOMEM; 270c0c77d8fSBjörn Töpel 271e451eb51SDavidlohr Bueso down_read(¤t->mm->mmap_sem); 272932f4a63SIra Weiny npgs = get_user_pages(umem->address, umem->npgs, 273932f4a63SIra Weiny gup_flags | FOLL_LONGTERM, &umem->pgs[0], NULL); 274e451eb51SDavidlohr Bueso up_read(¤t->mm->mmap_sem); 275c0c77d8fSBjörn Töpel 276c0c77d8fSBjörn Töpel if (npgs != umem->npgs) { 277c0c77d8fSBjörn Töpel if (npgs >= 0) { 278c0c77d8fSBjörn Töpel umem->npgs = npgs; 279c0c77d8fSBjörn Töpel err = -ENOMEM; 280c0c77d8fSBjörn Töpel goto out_pin; 281c0c77d8fSBjörn Töpel } 282c0c77d8fSBjörn Töpel err = npgs; 283c0c77d8fSBjörn Töpel goto out_pgs; 284c0c77d8fSBjörn Töpel } 285c0c77d8fSBjörn Töpel return 0; 286c0c77d8fSBjörn Töpel 287c0c77d8fSBjörn Töpel out_pin: 288c0c77d8fSBjörn Töpel xdp_umem_unpin_pages(umem); 289c0c77d8fSBjörn Töpel out_pgs: 290c0c77d8fSBjörn Töpel kfree(umem->pgs); 291c0c77d8fSBjörn Töpel umem->pgs = NULL; 292c0c77d8fSBjörn Töpel return err; 293c0c77d8fSBjörn Töpel } 294c0c77d8fSBjörn Töpel 295c0c77d8fSBjörn Töpel static int xdp_umem_account_pages(struct xdp_umem *umem) 296c0c77d8fSBjörn Töpel { 297c0c77d8fSBjörn Töpel unsigned long lock_limit, new_npgs, old_npgs; 298c0c77d8fSBjörn Töpel 299c0c77d8fSBjörn Töpel if (capable(CAP_IPC_LOCK)) 300c0c77d8fSBjörn Töpel return 0; 301c0c77d8fSBjörn Töpel 302c0c77d8fSBjörn Töpel lock_limit = rlimit(RLIMIT_MEMLOCK) >> PAGE_SHIFT; 303c0c77d8fSBjörn Töpel umem->user = get_uid(current_user()); 304c0c77d8fSBjörn Töpel 305c0c77d8fSBjörn Töpel do { 306c0c77d8fSBjörn Töpel old_npgs = atomic_long_read(&umem->user->locked_vm); 307c0c77d8fSBjörn Töpel new_npgs = old_npgs + umem->npgs; 308c0c77d8fSBjörn Töpel if (new_npgs > lock_limit) { 309c0c77d8fSBjörn Töpel free_uid(umem->user); 310c0c77d8fSBjörn Töpel umem->user = NULL; 311c0c77d8fSBjörn Töpel return -ENOBUFS; 312c0c77d8fSBjörn Töpel } 313c0c77d8fSBjörn Töpel } while (atomic_long_cmpxchg(&umem->user->locked_vm, old_npgs, 314c0c77d8fSBjörn Töpel new_npgs) != old_npgs); 315c0c77d8fSBjörn Töpel return 0; 316c0c77d8fSBjörn Töpel } 317c0c77d8fSBjörn Töpel 318a49049eaSBjörn Töpel static int xdp_umem_reg(struct xdp_umem *umem, struct xdp_umem_reg *mr) 319c0c77d8fSBjörn Töpel { 320bbff2f32SBjörn Töpel u32 chunk_size = mr->chunk_size, headroom = mr->headroom; 321bbff2f32SBjörn Töpel unsigned int chunks, chunks_per_page; 322c0c77d8fSBjörn Töpel u64 addr = mr->addr, size = mr->len; 3238aef7340SBjörn Töpel int size_chk, err, i; 324c0c77d8fSBjörn Töpel 325bbff2f32SBjörn Töpel if (chunk_size < XDP_UMEM_MIN_CHUNK_SIZE || chunk_size > PAGE_SIZE) { 326c0c77d8fSBjörn Töpel /* Strictly speaking we could support this, if: 327c0c77d8fSBjörn Töpel * - huge pages, or* 328c0c77d8fSBjörn Töpel * - using an IOMMU, or 329c0c77d8fSBjörn Töpel * - making sure the memory area is consecutive 330c0c77d8fSBjörn Töpel * but for now, we simply say "computer says no". 331c0c77d8fSBjörn Töpel */ 332c0c77d8fSBjörn Töpel return -EINVAL; 333c0c77d8fSBjörn Töpel } 334c0c77d8fSBjörn Töpel 335bbff2f32SBjörn Töpel if (!is_power_of_2(chunk_size)) 336c0c77d8fSBjörn Töpel return -EINVAL; 337c0c77d8fSBjörn Töpel 338c0c77d8fSBjörn Töpel if (!PAGE_ALIGNED(addr)) { 339c0c77d8fSBjörn Töpel /* Memory area has to be page size aligned. For 340c0c77d8fSBjörn Töpel * simplicity, this might change. 341c0c77d8fSBjörn Töpel */ 342c0c77d8fSBjörn Töpel return -EINVAL; 343c0c77d8fSBjörn Töpel } 344c0c77d8fSBjörn Töpel 345c0c77d8fSBjörn Töpel if ((addr + size) < addr) 346c0c77d8fSBjörn Töpel return -EINVAL; 347c0c77d8fSBjörn Töpel 348bbff2f32SBjörn Töpel chunks = (unsigned int)div_u64(size, chunk_size); 349bbff2f32SBjörn Töpel if (chunks == 0) 350c0c77d8fSBjörn Töpel return -EINVAL; 351c0c77d8fSBjörn Töpel 352bbff2f32SBjörn Töpel chunks_per_page = PAGE_SIZE / chunk_size; 353bbff2f32SBjörn Töpel if (chunks < chunks_per_page || chunks % chunks_per_page) 354c0c77d8fSBjörn Töpel return -EINVAL; 355c0c77d8fSBjörn Töpel 356bbff2f32SBjörn Töpel headroom = ALIGN(headroom, 64); 357c0c77d8fSBjörn Töpel 358bbff2f32SBjörn Töpel size_chk = chunk_size - headroom - XDP_PACKET_HEADROOM; 359c0c77d8fSBjörn Töpel if (size_chk < 0) 360c0c77d8fSBjörn Töpel return -EINVAL; 361c0c77d8fSBjörn Töpel 362c0c77d8fSBjörn Töpel umem->address = (unsigned long)addr; 36393ee30f3SMagnus Karlsson umem->chunk_mask = ~((u64)chunk_size - 1); 36493ee30f3SMagnus Karlsson umem->size = size; 365bbff2f32SBjörn Töpel umem->headroom = headroom; 366bbff2f32SBjörn Töpel umem->chunk_size_nohr = chunk_size - headroom; 367c0c77d8fSBjörn Töpel umem->npgs = size / PAGE_SIZE; 368c0c77d8fSBjörn Töpel umem->pgs = NULL; 369c0c77d8fSBjörn Töpel umem->user = NULL; 370ac98d8aaSMagnus Karlsson INIT_LIST_HEAD(&umem->xsk_list); 371ac98d8aaSMagnus Karlsson spin_lock_init(&umem->xsk_list_lock); 372c0c77d8fSBjörn Töpel 373d3b42f14SBjörn Töpel refcount_set(&umem->users, 1); 374c0c77d8fSBjörn Töpel 375c0c77d8fSBjörn Töpel err = xdp_umem_account_pages(umem); 376c0c77d8fSBjörn Töpel if (err) 377044175a0SBjörn Töpel return err; 378c0c77d8fSBjörn Töpel 379c0c77d8fSBjörn Töpel err = xdp_umem_pin_pages(umem); 380c0c77d8fSBjörn Töpel if (err) 381c0c77d8fSBjörn Töpel goto out_account; 3828aef7340SBjörn Töpel 3838aef7340SBjörn Töpel umem->pages = kcalloc(umem->npgs, sizeof(*umem->pages), GFP_KERNEL); 3848aef7340SBjörn Töpel if (!umem->pages) { 3858aef7340SBjörn Töpel err = -ENOMEM; 3868aef7340SBjörn Töpel goto out_account; 3878aef7340SBjörn Töpel } 3888aef7340SBjörn Töpel 3898aef7340SBjörn Töpel for (i = 0; i < umem->npgs; i++) 390d9973cecSIvan Khoronzhuk umem->pages[i].addr = kmap(umem->pgs[i]); 3918aef7340SBjörn Töpel 392c0c77d8fSBjörn Töpel return 0; 393c0c77d8fSBjörn Töpel 394c0c77d8fSBjörn Töpel out_account: 395c0c77d8fSBjörn Töpel xdp_umem_unaccount_pages(umem); 396c0c77d8fSBjörn Töpel return err; 397c0c77d8fSBjörn Töpel } 398965a9909SMagnus Karlsson 399a49049eaSBjörn Töpel struct xdp_umem *xdp_umem_create(struct xdp_umem_reg *mr) 400a49049eaSBjörn Töpel { 401a49049eaSBjörn Töpel struct xdp_umem *umem; 402a49049eaSBjörn Töpel int err; 403a49049eaSBjörn Töpel 404a49049eaSBjörn Töpel umem = kzalloc(sizeof(*umem), GFP_KERNEL); 405a49049eaSBjörn Töpel if (!umem) 406a49049eaSBjörn Töpel return ERR_PTR(-ENOMEM); 407a49049eaSBjörn Töpel 40850e74c01SBjörn Töpel err = ida_simple_get(&umem_ida, 0, 0, GFP_KERNEL); 40950e74c01SBjörn Töpel if (err < 0) { 41050e74c01SBjörn Töpel kfree(umem); 41150e74c01SBjörn Töpel return ERR_PTR(err); 41250e74c01SBjörn Töpel } 41350e74c01SBjörn Töpel umem->id = err; 41450e74c01SBjörn Töpel 415a49049eaSBjörn Töpel err = xdp_umem_reg(umem, mr); 416a49049eaSBjörn Töpel if (err) { 41750e74c01SBjörn Töpel ida_simple_remove(&umem_ida, umem->id); 418a49049eaSBjörn Töpel kfree(umem); 419a49049eaSBjörn Töpel return ERR_PTR(err); 420a49049eaSBjörn Töpel } 421a49049eaSBjörn Töpel 422a49049eaSBjörn Töpel return umem; 423a49049eaSBjörn Töpel } 424a49049eaSBjörn Töpel 425965a9909SMagnus Karlsson bool xdp_umem_validate_queues(struct xdp_umem *umem) 426965a9909SMagnus Karlsson { 427da60cf00SBjörn Töpel return umem->fq && umem->cq; 428965a9909SMagnus Karlsson } 429