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mac80211_hwsim: allow testing paged RX

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Paged RX, i.e. SKBs with (some of) the data in pages instead
of the SKB header data (skb->data) can behave differently in
the stack and cause other bugs. To make debugging easier add
an option to hwsim to test with such SKBs.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Johannes Berg 2012-12-10 11:57:42 +01:00
parent f4eabc918c
commit a357d7f985
1 changed files with 23 additions and 3 deletions
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26
drivers/net/wireless/mac80211_hwsim.c
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@ -48,6 +48,10 @@ static int channels = 1;
module_param(channels, int, 0444);
MODULE_PARM_DESC(channels, "Number of concurrent channels");
static bool paged_rx = false;
module_param(paged_rx, bool, 0644);
MODULE_PARM_DESC(paged_rx, "Use paged SKBs for RX instead of linear ones");
/**
* enum hwsim_regtest - the type of regulatory tests we offer
*
@ -755,9 +759,25 @@ static bool mac80211_hwsim_tx_frame_no_nl(struct ieee80211_hw *hw,
* reserve some space for our vendor and the normal
* radiotap header, since we're copying anyway
*/
nskb = skb_copy_expand(skb, 64, 0, GFP_ATOMIC);
if (nskb == NULL)
continue;
if (skb->len < PAGE_SIZE && paged_rx) {
struct page *page = alloc_page(GFP_ATOMIC);
if (!page)
continue;
nskb = dev_alloc_skb(128);
if (!nskb) {
__free_page(page);
continue;
}
memcpy(page_address(page), skb->data, skb->len);
skb_add_rx_frag(nskb, 0, page, 0, skb->len, skb->len);
} else {
nskb = skb_copy(skb, GFP_ATOMIC);
if (!nskb)
continue;
}
if (mac80211_hwsim_addr_match(data2, hdr->addr1))
ack = true;