diff options
Diffstat (limited to 'package/kernel/mac80211/patches/308-rt2x00-do-not-align-payload-on-modern-H-W.patch')
| -rw-r--r-- | package/kernel/mac80211/patches/308-rt2x00-do-not-align-payload-on-modern-H-W.patch | 95 |
1 files changed, 0 insertions, 95 deletions
diff --git a/package/kernel/mac80211/patches/308-rt2x00-do-not-align-payload-on-modern-H-W.patch b/package/kernel/mac80211/patches/308-rt2x00-do-not-align-payload-on-modern-H-W.patch deleted file mode 100644 index 384a0be808..0000000000 --- a/package/kernel/mac80211/patches/308-rt2x00-do-not-align-payload-on-modern-H-W.patch +++ /dev/null @@ -1,95 +0,0 @@ -From: Stanislaw Gruszka <sgruszka@redhat.com> -Date: Sun, 2 Nov 2014 13:38:47 +0100 -Subject: [PATCH] rt2x00: do not align payload on modern H/W - -RT2800 and newer hardware require padding between header and payload if -header length is not multiple of 4. - -For historical reasons we also align payload to to 4 bytes boundary, but -such alignment is not needed on modern H/W. - -Patch improve performance on embedded CPUs and _possibly_ fixes -skb_under_panic problems reported from time to time: - -https://bugzilla.kernel.org/show_bug.cgi?id=84911 -https://bugzilla.kernel.org/show_bug.cgi?id=72471 -http://marc.info/?l=linux-wireless&m=139108549530402&w=2 -https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1087591 - -But we can not explain or otherwise confirm the patch fixes this panic -issue for sure. - -Originally-From: Helmut Schaa <helmut.schaa@googlemail.com> -Signed-off-by: Stanislaw Gruszka <sgruszka@redhat.com> ---- - ---- a/drivers/net/wireless/rt2x00/rt2x00queue.c -+++ b/drivers/net/wireless/rt2x00/rt2x00queue.c -@@ -158,55 +158,29 @@ void rt2x00queue_align_frame(struct sk_b - skb_trim(skb, frame_length); - } - --void rt2x00queue_insert_l2pad(struct sk_buff *skb, unsigned int header_length) -+/* -+ * H/W needs L2 padding between the header and the paylod if header size -+ * is not 4 bytes aligned. -+ */ -+void rt2x00queue_insert_l2pad(struct sk_buff *skb, unsigned int hdr_len) - { -- unsigned int payload_length = skb->len - header_length; -- unsigned int header_align = ALIGN_SIZE(skb, 0); -- unsigned int payload_align = ALIGN_SIZE(skb, header_length); -- unsigned int l2pad = payload_length ? L2PAD_SIZE(header_length) : 0; -+ unsigned int l2pad = (skb->len > hdr_len) ? L2PAD_SIZE(hdr_len) : 0; - -- /* -- * Adjust the header alignment if the payload needs to be moved more -- * than the header. -- */ -- if (payload_align > header_align) -- header_align += 4; -- -- /* There is nothing to do if no alignment is needed */ -- if (!header_align) -+ if (!l2pad) - return; - -- /* Reserve the amount of space needed in front of the frame */ -- skb_push(skb, header_align); -- -- /* -- * Move the header. -- */ -- memmove(skb->data, skb->data + header_align, header_length); -- -- /* Move the payload, if present and if required */ -- if (payload_length && payload_align) -- memmove(skb->data + header_length + l2pad, -- skb->data + header_length + l2pad + payload_align, -- payload_length); -- -- /* Trim the skb to the correct size */ -- skb_trim(skb, header_length + l2pad + payload_length); -+ skb_push(skb, l2pad); -+ memmove(skb->data, skb->data + l2pad, hdr_len); - } - --void rt2x00queue_remove_l2pad(struct sk_buff *skb, unsigned int header_length) -+void rt2x00queue_remove_l2pad(struct sk_buff *skb, unsigned int hdr_len) - { -- /* -- * L2 padding is only present if the skb contains more than just the -- * IEEE 802.11 header. -- */ -- unsigned int l2pad = (skb->len > header_length) ? -- L2PAD_SIZE(header_length) : 0; -+ unsigned int l2pad = (skb->len > hdr_len) ? L2PAD_SIZE(hdr_len) : 0; - - if (!l2pad) - return; - -- memmove(skb->data + l2pad, skb->data, header_length); -+ memmove(skb->data + l2pad, skb->data, hdr_len); - skb_pull(skb, l2pad); - } - |