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Date: Tue, 9 Jul 2019 10:30:38 +0000
From: Michal Kalderon <mkalderon@...vell.com>
To: Gal Pressman <galpress@...zon.com>,
Ariel Elior <aelior@...vell.com>,
"jgg@...pe.ca" <jgg@...pe.ca>,
"dledford@...hat.com" <dledford@...hat.com>
CC: "linux-rdma@...r.kernel.org" <linux-rdma@...r.kernel.org>,
"davem@...emloft.net" <davem@...emloft.net>,
"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: RE: [PATCH v5 rdma-next 2/6] RDMA/efa: Use the common mmap_xa helpers
> From: Gal Pressman <galpress@...zon.com>
> Sent: Tuesday, July 9, 2019 12:03 PM
>
> On 08/07/2019 12:14, Michal Kalderon wrote:
>
> Hi, a few nits:
Thanks for the review, will fix them.
>
> > Remove the functions related to managing the mmap_xa database.
> > This code was copied to the ib_core. Use the common API's instead.
> >
> > Signed-off-by: Michal Kalderon <michal.kalderon@...vell.com>
> > ---
> > drivers/infiniband/hw/efa/efa.h | 3 +-
> > drivers/infiniband/hw/efa/efa_main.c | 1 +
> > drivers/infiniband/hw/efa/efa_verbs.c | 183
> > ++++++++--------------------------
> > 3 files changed, 42 insertions(+), 145 deletions(-) diff --git
> > a/drivers/infiniband/hw/efa/efa_verbs.c
> > b/drivers/infiniband/hw/efa/efa_verbs.c
> > index df77bc312a25..5dff892da161 100644
> > --- a/drivers/infiniband/hw/efa/efa_verbs.c
> > +++ b/drivers/infiniband/hw/efa/efa_verbs.c
> > @@ -13,34 +13,15 @@
> >
> > #include "efa.h"
> >
> > -#define EFA_MMAP_FLAG_SHIFT 56
> > -#define EFA_MMAP_PAGE_MASK GENMASK(EFA_MMAP_FLAG_SHIFT -
> 1, 0)
> > -#define EFA_MMAP_INVALID U64_MAX
> > -
>
> Don't delete the blank line please.
>
> > enum {
> > EFA_MMAP_DMA_PAGE = 0,
> > EFA_MMAP_IO_WC,
> > EFA_MMAP_IO_NC,
> > };
> > -
> > #define EFA_AENQ_ENABLED_GROUPS \
> > (BIT(EFA_ADMIN_FATAL_ERROR) | BIT(EFA_ADMIN_WARNING) | \
> > BIT(EFA_ADMIN_NOTIFICATION) | BIT(EFA_ADMIN_KEEP_ALIVE))
> >
> > -struct efa_mmap_entry {
> > - void *obj;
> > - u64 address;
> > - u64 length;
> > - u32 mmap_page;
> > - u8 mmap_flag;
> > -};
> > -
> > -static inline u64 get_mmap_key(const struct efa_mmap_entry *efa) -{
> > - return ((u64)efa->mmap_flag << EFA_MMAP_FLAG_SHIFT) |
> > - ((u64)efa->mmap_page << PAGE_SHIFT);
> > -}
> > -
> > #define EFA_CHUNK_PAYLOAD_SHIFT 12
> > #define EFA_CHUNK_PAYLOAD_SIZE
> BIT(EFA_CHUNK_PAYLOAD_SHIFT)
> > #define EFA_CHUNK_PAYLOAD_PTR_SIZE 8
> > @@ -145,105 +126,7 @@ static void *efa_zalloc_mapped(struct efa_dev
> *dev, dma_addr_t *dma_addr,
> > return addr;
> > }
> >
> > -/*
> > - * This is only called when the ucontext is destroyed and there can
> > be no
> > - * concurrent query via mmap or allocate on the xarray, thus we can
> > be sure no
> > - * other thread is using the entry pointer. We also know that all the
> > BAR
> > - * pages have either been zap'd or munmaped at this point. Normal
> > pages are
> > - * refcounted and will be freed at the proper time.
> > - */
> > -static void mmap_entries_remove_free(struct efa_dev *dev,
> > - struct efa_ucontext *ucontext)
> > -{
> > - struct efa_mmap_entry *entry;
> > - unsigned long mmap_page;
> >
> > - xa_for_each(&ucontext->mmap_xa, mmap_page, entry) {
> > - xa_erase(&ucontext->mmap_xa, mmap_page);
> > -
> > - ibdev_dbg(
> > - &dev->ibdev,
> > - "mmap: obj[0x%p] key[%#llx] addr[%#llx] len[%#llx]
> removed\n",
> > - entry->obj, get_mmap_key(entry), entry->address,
> > - entry->length);
> > - if (entry->mmap_flag == EFA_MMAP_DMA_PAGE)
> > - /* DMA mapping is already gone, now free the pages
> */
> > - free_pages_exact(phys_to_virt(entry->address),
> > - entry->length);
> > - kfree(entry);
> > - }
> > -}
> > -
> > -static struct efa_mmap_entry *mmap_entry_get(struct efa_dev *dev,
> > - struct efa_ucontext *ucontext,
> > - u64 key, u64 len)
> > -{
> > - struct efa_mmap_entry *entry;
> > - u64 mmap_page;
> > -
> > - mmap_page = (key & EFA_MMAP_PAGE_MASK) >> PAGE_SHIFT;
> > - if (mmap_page > U32_MAX)
> > - return NULL;
> > -
> > - entry = xa_load(&ucontext->mmap_xa, mmap_page);
> > - if (!entry || get_mmap_key(entry) != key || entry->length != len)
> > - return NULL;
> > -
> > - ibdev_dbg(&dev->ibdev,
> > - "mmap: obj[0x%p] key[%#llx] addr[%#llx] len[%#llx]
> removed\n",
> > - entry->obj, key, entry->address, entry->length);
> > -
> > - return entry;
> > -}
> > -
> > -/*
> > - * Note this locking scheme cannot support removal of entries, except
> > during
> > - * ucontext destruction when the core code guarentees no concurrency.
> > - */
> > -static u64 mmap_entry_insert(struct efa_dev *dev, struct efa_ucontext
> *ucontext,
> > - void *obj, u64 address, u64 length, u8 mmap_flag)
> > -{
> > - struct efa_mmap_entry *entry;
> > - u32 next_mmap_page;
> > - int err;
> > -
> > - entry = kmalloc(sizeof(*entry), GFP_KERNEL);
> > - if (!entry)
> > - return EFA_MMAP_INVALID;
> > -
> > - entry->obj = obj;
> > - entry->address = address;
> > - entry->length = length;
> > - entry->mmap_flag = mmap_flag;
> > -
> > - xa_lock(&ucontext->mmap_xa);
> > - if (check_add_overflow(ucontext->mmap_xa_page,
> > - (u32)(length >> PAGE_SHIFT),
> > - &next_mmap_page))
> > - goto err_unlock;
> > -
> > - entry->mmap_page = ucontext->mmap_xa_page;
> > - ucontext->mmap_xa_page = next_mmap_page;
> > - err = __xa_insert(&ucontext->mmap_xa, entry->mmap_page,
> entry,
> > - GFP_KERNEL);
> > - if (err)
> > - goto err_unlock;
> > -
> > - xa_unlock(&ucontext->mmap_xa);
> > -
> > - ibdev_dbg(
> > - &dev->ibdev,
> > - "mmap: obj[0x%p] addr[%#llx], len[%#llx], key[%#llx]
> inserted\n",
> > - entry->obj, entry->address, entry->length,
> get_mmap_key(entry));
> > -
> > - return get_mmap_key(entry);
> > -
> > -err_unlock:
> > - xa_unlock(&ucontext->mmap_xa);
> > - kfree(entry);
> > - return EFA_MMAP_INVALID;
> > -
> > -}
> >
>
> You left two extra blank lines between efa_zalloc_mapped and
> efa_query_device.
>
> > int efa_query_device(struct ib_device *ibdev,
> > struct ib_device_attr *props,
> > @@ -488,45 +371,52 @@ static int qp_mmap_entries_setup(struct efa_qp
> *qp,
> > struct efa_com_create_qp_params
> *params,
> > struct efa_ibv_create_qp_resp *resp) {
> > + u64 address;
> > + u64 length;
>
> Line break.
>
> > /*
> > * Once an entry is inserted it might be mmapped, hence cannot be
> > * cleaned up until dealloc_ucontext.
> > */
> > resp->sq_db_mmap_key =
> > - mmap_entry_insert(dev, ucontext, qp,
> > - dev->db_bar_addr + resp->sq_db_offset,
> > - PAGE_SIZE, EFA_MMAP_IO_NC);
> > - if (resp->sq_db_mmap_key == EFA_MMAP_INVALID)
> > + rdma_user_mmap_entry_insert(&ucontext->ibucontext, qp,
> > + dev->db_bar_addr +
> > + resp->sq_db_offset,
> > + PAGE_SIZE, EFA_MMAP_IO_NC);
> > + if (resp->sq_db_mmap_key == RDMA_USER_MMAP_INVALID)
> > return -ENOMEM;
> >
> > resp->sq_db_offset &= ~PAGE_MASK;
> >
> > + address = dev->mem_bar_addr + resp->llq_desc_offset;
> > + length = PAGE_ALIGN(params->sq_ring_size_in_bytes +
> > + (resp->llq_desc_offset & ~PAGE_MASK));
> > resp->llq_desc_mmap_key =
> > - mmap_entry_insert(dev, ucontext, qp,
> > - dev->mem_bar_addr + resp-
> >llq_desc_offset,
> > - PAGE_ALIGN(params-
> >sq_ring_size_in_bytes +
> > - (resp->llq_desc_offset &
> ~PAGE_MASK)),
> > - EFA_MMAP_IO_WC);
> > - if (resp->llq_desc_mmap_key == EFA_MMAP_INVALID)
> > + rdma_user_mmap_entry_insert(&ucontext->ibucontext, qp,
> > + address,
> > + length,
> > + EFA_MMAP_IO_WC);
> > + if (resp->llq_desc_mmap_key == RDMA_USER_MMAP_INVALID)
> > return -ENOMEM;
> >
> > resp->llq_desc_offset &= ~PAGE_MASK;
> >
> > if (qp->rq_size) {
> > + address = dev->db_bar_addr + resp->rq_db_offset;
> > resp->rq_db_mmap_key =
> > - mmap_entry_insert(dev, ucontext, qp,
> > - dev->db_bar_addr + resp-
> >rq_db_offset,
> > - PAGE_SIZE, EFA_MMAP_IO_NC);
> > - if (resp->rq_db_mmap_key == EFA_MMAP_INVALID)
> > + rdma_user_mmap_entry_insert(&ucontext-
> >ibucontext, qp,
> > + address, PAGE_SIZE,
> > + EFA_MMAP_IO_NC);
> > + if (resp->rq_db_mmap_key ==
> RDMA_USER_MMAP_INVALID)
> > return -ENOMEM;
> >
> > resp->rq_db_offset &= ~PAGE_MASK;
> >
> > + address = virt_to_phys(qp->rq_cpu_addr);
> > resp->rq_mmap_key =
> > - mmap_entry_insert(dev, ucontext, qp,
> > - virt_to_phys(qp->rq_cpu_addr),
> > - qp->rq_size,
> EFA_MMAP_DMA_PAGE);
> > - if (resp->rq_mmap_key == EFA_MMAP_INVALID)
> > + rdma_user_mmap_entry_insert(&ucontext-
> >ibucontext, qp,
> > + address, qp->rq_size,
> > + EFA_MMAP_DMA_PAGE);
> > + if (resp->rq_mmap_key == RDMA_USER_MMAP_INVALID)
> > return -ENOMEM;
> >
> > resp->rq_mmap_size = qp->rq_size;
> > @@ -875,11 +765,13 @@ void efa_destroy_cq(struct ib_cq *ibcq, struct
> > ib_udata *udata) static int cq_mmap_entries_setup(struct efa_dev *dev,
> struct efa_cq *cq,
> > struct efa_ibv_create_cq_resp *resp) {
> > + struct efa_ucontext *ucontext = cq->ucontext;
>
> Line break.
>
> > resp->q_mmap_size = cq->size;
> > - resp->q_mmap_key = mmap_entry_insert(dev, cq->ucontext, cq,
> > - virt_to_phys(cq->cpu_addr),
> > - cq->size,
> EFA_MMAP_DMA_PAGE);
> > - if (resp->q_mmap_key == EFA_MMAP_INVALID)
> > + resp->q_mmap_key =
> > + rdma_user_mmap_entry_insert(&ucontext->ibucontext, cq,
> > + virt_to_phys(cq->cpu_addr),
> > + cq->size,
> EFA_MMAP_DMA_PAGE);
> > + if (resp->q_mmap_key == RDMA_USER_MMAP_INVALID)
> > return -ENOMEM;
> >
> > return 0;
> > @@ -1531,7 +1423,6 @@ int efa_alloc_ucontext(struct ib_ucontext
> *ibucontext, struct ib_udata *udata)
> > goto err_out;
> >
> > ucontext->uarn = result.uarn;
> > - xa_init(&ucontext->mmap_xa);
> >
> > resp.cmds_supp_udata_mask |=
> EFA_USER_CMDS_SUPP_UDATA_QUERY_DEVICE;
> > resp.cmds_supp_udata_mask |=
> EFA_USER_CMDS_SUPP_UDATA_CREATE_AH;
> > @@ -1560,19 +1451,25 @@ void efa_dealloc_ucontext(struct ib_ucontext
> *ibucontext)
> > struct efa_ucontext *ucontext = to_eucontext(ibucontext);
> > struct efa_dev *dev = to_edev(ibucontext->device);
> >
> > - mmap_entries_remove_free(dev, ucontext);
> > efa_dealloc_uar(dev, ucontext->uarn);
> > }
> >
> > +void efa_mmap_free(u64 address, u64 length, u8 mmap_flag)
> > +{
> > + /* DMA mapping is already gone, now free the pages */
> > + if (mmap_flag == EFA_MMAP_DMA_PAGE)
> > + free_pages_exact(phys_to_virt(address), length);
> > +}
> > +
> > static int __efa_mmap(struct efa_dev *dev, struct efa_ucontext
> *ucontext,
> > struct vm_area_struct *vma, u64 key, u64 length)
> > {
> > - struct efa_mmap_entry *entry;
> > + struct rdma_user_mmap_entry *entry;
> > unsigned long va;
> > u64 pfn;
> > int err;
> >
> > - entry = mmap_entry_get(dev, ucontext, key, length);
> > + entry = rdma_user_mmap_entry_get(&ucontext->ibucontext, key,
> length);
> > if (!entry) {
> > ibdev_dbg(&dev->ibdev, "key[%#llx] does not have valid
> entry\n",
> > key);
> >
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