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iwl4965: better skb management in rx path 

4965 version of Eric patch "iwl3945: better skb management in rx path".
It fixes several problems :

1) skb->truesize is underestimated.
   We really consume PAGE_SIZE bytes for a fragment,
   not the frame length.
2) 128 bytes of initial headroom is a bit low and forces reallocations.
3) We can avoid consuming a full page for small enough frames.

Signed-off-by: Stanislaw Gruszka <sgruszka@redhat.com>
Acked-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Stanislaw Gruszka 2013-07-01 14:19:30 +02:00 committed by John W. Linville
parent 092c46498e
commit c1de4a9557
1 changed files with 12 additions and 6 deletions
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18
drivers/net/wireless/iwlegacy/4965-mac.c
View File

@ -574,9 +574,11 @@ il4965_translate_rx_status(struct il_priv *il, u32 decrypt_in)
return decrypt_out;
}
#define SMALL_PACKET_SIZE 256
static void
il4965_pass_packet_to_mac80211(struct il_priv *il, struct ieee80211_hdr *hdr,
u16 len, u32 ampdu_status, struct il_rx_buf *rxb,
u32 len, u32 ampdu_status, struct il_rx_buf *rxb,
struct ieee80211_rx_status *stats)
{
struct sk_buff *skb;
@ -598,21 +600,25 @@ il4965_pass_packet_to_mac80211(struct il_priv *il, struct ieee80211_hdr *hdr,
il_set_decrypted_flag(il, hdr, ampdu_status, stats))
return;
skb = dev_alloc_skb(128);
skb = dev_alloc_skb(SMALL_PACKET_SIZE);
if (!skb) {
IL_ERR("dev_alloc_skb failed\n");
return;
}
skb_add_rx_frag(skb, 0, rxb->page, (void *)hdr - rxb_addr(rxb), len,
len);
if (len <= SMALL_PACKET_SIZE) {
memcpy(skb_put(skb, len), hdr, len);
} else {
skb_add_rx_frag(skb, 0, rxb->page, (void *)hdr - rxb_addr(rxb),
len, PAGE_SIZE << il->hw_params.rx_page_order);
il->alloc_rxb_page--;
rxb->page = NULL;
}
il_update_stats(il, false, fc, len);
memcpy(IEEE80211_SKB_RXCB(skb), stats, sizeof(*stats));
ieee80211_rx(il->hw, skb);
il->alloc_rxb_page--;
rxb->page = NULL;
}
/* Called for N_RX (legacy ABG frames), or