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Commit 8aef7340 authored by Björn Töpel's avatar Björn Töpel Committed by Daniel Borkmann
Browse files

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: default avatarBjörn Töpel <bjorn.topel@intel.com>
Signed-off-by: default avatarDaniel Borkmann <daniel@iogearbox.net>
parent e61e62b9

include/net/xdp_sock.h

+6 −1
Original line number Diff line number Diff line
@@ -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;

};

net/xdp/xdp_umem.c

+14 −1
Original line number Diff line number Diff line
@@ -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:

net/xdp/xdp_umem.h

+1 −2
Original line number Diff line number Diff line
@@ -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);