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xsk: introduce xdp_umem_page 

The xdp_umem_page holds the address for a page. Trade memory for
faster lookup. Later, we'll add DMA address here as well.

Signed-off-by: Björn Töpel <bjorn.topel@intel.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
This commit is contained in:
Björn Töpel 2018-06-04 14:05:52 +02:00 committed by Daniel Borkmann
parent e61e62b9e2
commit 8aef7340ae
3 changed files with 21 additions and 4 deletions
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7
include/net/xdp_sock.h
View File

@ -20,10 +20,14 @@ struct xdp_umem_props {
u64 size;
};
struct xdp_umem_page {
void *addr;
};
struct xdp_umem {
struct xsk_queue *fq;
struct xsk_queue *cq;
struct page **pgs;
struct xdp_umem_page *pages;
struct xdp_umem_props props;
u32 headroom;
u32 chunk_size_nohr;
@ -32,6 +36,7 @@ struct xdp_umem {
unsigned long address;
refcount_t users;
struct work_struct work;
struct page **pgs;
u32 npgs;
};

15
net/xdp/xdp_umem.c
View File

@ -65,6 +65,9 @@ static void xdp_umem_release(struct xdp_umem *umem)
goto out;
mmput(mm);
kfree(umem->pages);
umem->pages = NULL;
xdp_umem_unaccount_pages(umem);
out:
kfree(umem);
@ -155,7 +158,7 @@ static int xdp_umem_reg(struct xdp_umem *umem, struct xdp_umem_reg *mr)
u32 chunk_size = mr->chunk_size, headroom = mr->headroom;
unsigned int chunks, chunks_per_page;
u64 addr = mr->addr, size = mr->len;
int size_chk, err;
int size_chk, err, i;
if (chunk_size < XDP_UMEM_MIN_CHUNK_SIZE || chunk_size > PAGE_SIZE) {
/* Strictly speaking we could support this, if:
@ -213,6 +216,16 @@ static int xdp_umem_reg(struct xdp_umem *umem, struct xdp_umem_reg *mr)
err = xdp_umem_pin_pages(umem);
if (err)
goto out_account;
umem->pages = kcalloc(umem->npgs, sizeof(*umem->pages), GFP_KERNEL);
if (!umem->pages) {
err = -ENOMEM;
goto out_account;
}
for (i = 0; i < umem->npgs; i++)
umem->pages[i].addr = page_address(umem->pgs[i]);
return 0;
out_account:

3
net/xdp/xdp_umem.h
View File

@ -10,8 +10,7 @@
static inline char *xdp_umem_get_data(struct xdp_umem *umem, u64 addr)
{
return page_address(umem->pgs[addr >> PAGE_SHIFT]) +
(addr & (PAGE_SIZE - 1));
return umem->pages[addr >> PAGE_SHIFT].addr + (addr & (PAGE_SIZE - 1));
}
bool xdp_umem_validate_queues(struct xdp_umem *umem);