leandrof/linux
1
0
Fork 0
forked from Minki/linux
Code Issues Pull Requests Packages Projects Releases Wiki Activity

af_packet: use vmalloc_to_page() instead for the addresss returned by vmalloc()

Browse Source 
The following commit causes the pgv->buffer may point to the memory
returned by vmalloc(). And we can't use virt_to_page() for the vmalloc
address.

This patch introduces a new inline function pgv_to_page(), which calls
vmalloc_to_page() for the vmalloc address, and virt_to_page() for the
__get_free_pages address.

We used to increase page pointer to get the next page at the next page
address, after Neil's patch, it is wrong, as the physical address may
be not continuous. This patch also fixes this issue.

    commit 0e3125c755
    Author: Neil Horman <nhorman@tuxdriver.com>
    Date:   Tue Nov 16 10:26:47 2010 -0800

    packet: Enhance AF_PACKET implementation to not require high order contiguous memory allocation (v4)

Signed-off-by: Changli Gao <xiaosuo@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Changli Gao 2010-12-01 02:52:20 +00:00 committed by David S. Miller
parent f7fce74e38
commit 0af55bb58f
1 changed files with 18 additions and 16 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

34
net/packet/af_packet.c
View File

@ -224,6 +224,13 @@ struct packet_skb_cb {
#define PACKET_SKB_CB(__skb) ((struct packet_skb_cb *)((__skb)->cb))
static inline struct page *pgv_to_page(void *addr)
{
if (is_vmalloc_addr(addr))
return vmalloc_to_page(addr);
return virt_to_page(addr);
}
static void __packet_set_status(struct packet_sock *po, void *frame, int status)
{
union {
@ -236,11 +243,11 @@ static void __packet_set_status(struct packet_sock *po, void *frame, int status)
switch (po->tp_version) {
case TPACKET_V1:
h.h1->tp_status = status;
flush_dcache_page(virt_to_page(&h.h1->tp_status));
flush_dcache_page(pgv_to_page(&h.h1->tp_status));
break;
case TPACKET_V2:
h.h2->tp_status = status;
flush_dcache_page(virt_to_page(&h.h2->tp_status));
flush_dcache_page(pgv_to_page(&h.h2->tp_status));
break;
default:
pr_err("TPACKET version not supported\n");
@ -263,10 +270,10 @@ static int __packet_get_status(struct packet_sock *po, void *frame)
h.raw = frame;
switch (po->tp_version) {
case TPACKET_V1:
flush_dcache_page(virt_to_page(&h.h1->tp_status));
flush_dcache_page(pgv_to_page(&h.h1->tp_status));
return h.h1->tp_status;
case TPACKET_V2:
flush_dcache_page(virt_to_page(&h.h2->tp_status));
flush_dcache_page(pgv_to_page(&h.h2->tp_status));
return h.h2->tp_status;
default:
pr_err("TPACKET version not supported\n");
@ -800,15 +807,11 @@ static int tpacket_rcv(struct sk_buff *skb, struct net_device *dev,
__packet_set_status(po, h.raw, status);
smp_mb();
{
struct page *p_start, *p_end;
u8 *h_end = h.raw + macoff + snaplen - 1;
u8 *start, *end;
p_start = virt_to_page(h.raw);
p_end = virt_to_page(h_end);
while (p_start <= p_end) {
flush_dcache_page(p_start);
p_start++;
}
end = (u8 *)PAGE_ALIGN((unsigned long)h.raw + macoff + snaplen);
for (start = h.raw; start < end; start += PAGE_SIZE)
flush_dcache_page(pgv_to_page(start));
}
sk->sk_data_ready(sk, 0);
@ -915,7 +918,6 @@ static int tpacket_fill_skb(struct packet_sock *po, struct sk_buff *skb,
}
err = -EFAULT;
page = virt_to_page(data);
offset = offset_in_page(data);
len_max = PAGE_SIZE - offset;
len = ((to_write > len_max) ? len_max : to_write);
@ -934,11 +936,11 @@ static int tpacket_fill_skb(struct packet_sock *po, struct sk_buff *skb,
return -EFAULT;
}
page = pgv_to_page(data);
data += len;
flush_dcache_page(page);
get_page(page);
skb_fill_page_desc(skb,
nr_frags,
page++, offset, len);
skb_fill_page_desc(skb, nr_frags, page, offset, len);
to_write -= len;
offset = 0;
len_max = PAGE_SIZE;