Testing with RTL8822BE hardware, when available memory is low, we
frequently see a kernel panic and system freeze.
First, rtw_pci_rx_isr encounters a memory allocation failure (trimmed):
rx routine starvation
WARNING: CPU: 7 PID: 9871 at drivers/net/wireless/realtek/rtw88/pci.c:822 rtw_pci_rx_isr.constprop.25+0x35a/0x370 [rtwpci]
[ 2356.580313] RIP: 0010:rtw_pci_rx_isr.constprop.25+0x35a/0x370 [rtwpci]
Then we see a variety of different error conditions and kernel panics,
such as this one (trimmed):
rtw_pci 0000:02:00.0: pci bus timeout, check dma status
skbuff: skb_over_panic: text:00000000091b6e66 len:415 put:415 head:00000000d2880c6f data:000000007a02b1ea tail:0x1df end:0xc0 dev:<NULL>
------------[ cut here ]------------
kernel BUG at net/core/skbuff.c:105!
invalid opcode: 0000 [#1] SMP NOPTI
RIP: 0010:skb_panic+0x43/0x45
When skb allocation fails and the "rx routine starvation" is hit, the
function returns immediately without updating the RX ring. At this
point, the RX ring may continue referencing an old skb which was already
handed off to ieee80211_rx_irqsafe(). When it comes to be used again,
bad things happen.
This patch allocates a new, data-sized skb first in RX ISR. After
copying the data in, we pass it to the upper layers. However, if skb
allocation fails, we effectively drop the frame. In both cases, the
original, full size ring skb is reused.
In addition, by fixing the kernel crash, the RX routine should now
generally behave better under low memory conditions.
Buglink: https://bugzilla.kernel.org/show_bug.cgi?id=204053
Signed-off-by: Jian-Hong Pan <[email protected]>
Cc: <[email protected]>
---
v2:
- Allocate new data-sized skb and put data into it, then pass it to
mac80211. Reuse the original skb in RX ring by DMA sync.
- Modify the commit message.
- Introduce following [PATCH v3 2/2] rtw88: pci: Use DMA sync instead
of remapping in RX ISR.
v3:
- Same as v2.
drivers/net/wireless/realtek/rtw88/pci.c | 49 +++++++++++-------------
1 file changed, 22 insertions(+), 27 deletions(-)
diff --git a/drivers/net/wireless/realtek/rtw88/pci.c b/drivers/net/wireless/realtek/rtw88/pci.c
index cfe05ba7280d..e9fe3ad896c8 100644
--- a/drivers/net/wireless/realtek/rtw88/pci.c
+++ b/drivers/net/wireless/realtek/rtw88/pci.c
@@ -763,6 +763,7 @@ static void rtw_pci_rx_isr(struct rtw_dev *rtwdev, struct rtw_pci *rtwpci,
u32 pkt_offset;
u32 pkt_desc_sz = chip->rx_pkt_desc_sz;
u32 buf_desc_sz = chip->rx_buf_desc_sz;
+ u32 new_len;
u8 *rx_desc;
dma_addr_t dma;
@@ -790,40 +791,34 @@ static void rtw_pci_rx_isr(struct rtw_dev *rtwdev, struct rtw_pci *rtwpci,
pkt_offset = pkt_desc_sz + pkt_stat.drv_info_sz +
pkt_stat.shift;
- if (pkt_stat.is_c2h) {
- /* keep rx_desc, halmac needs it */
- skb_put(skb, pkt_stat.pkt_len + pkt_offset);
+ /* discard current skb if the new skb cannot be allocated as a
+ * new one in rx ring later
+ */
+ new_len = pkt_stat.pkt_len + pkt_offset;
+ new = dev_alloc_skb(new_len);
+ if (WARN_ONCE(!new, "rx routine starvation\n"))
+ goto next_rp;
+
+ /* put the DMA data including rx_desc from phy to new skb */
+ skb_put_data(new, skb->data, new_len);
- /* pass offset for further operation */
- *((u32 *)skb->cb) = pkt_offset;
- skb_queue_tail(&rtwdev->c2h_queue, skb);
+ if (pkt_stat.is_c2h) {
+ /* pass rx_desc & offset for further operation */
+ *((u32 *)new->cb) = pkt_offset;
+ skb_queue_tail(&rtwdev->c2h_queue, new);
ieee80211_queue_work(rtwdev->hw, &rtwdev->c2h_work);
} else {
- /* remove rx_desc, maybe use skb_pull? */
- skb_put(skb, pkt_stat.pkt_len);
- skb_reserve(skb, pkt_offset);
-
- /* alloc a smaller skb to mac80211 */
- new = dev_alloc_skb(pkt_stat.pkt_len);
- if (!new) {
- new = skb;
- } else {
- skb_put_data(new, skb->data, skb->len);
- dev_kfree_skb_any(skb);
- }
- /* TODO: merge into rx.c */
- rtw_rx_stats(rtwdev, pkt_stat.vif, skb);
+ /* remove rx_desc */
+ skb_pull(new, pkt_offset);
+
+ rtw_rx_stats(rtwdev, pkt_stat.vif, new);
memcpy(new->cb, &rx_status, sizeof(rx_status));
ieee80211_rx_irqsafe(rtwdev->hw, new);
}
- /* skb delivered to mac80211, alloc a new one in rx ring */
- new = dev_alloc_skb(RTK_PCI_RX_BUF_SIZE);
- if (WARN(!new, "rx routine starvation\n"))
- return;
-
- ring->buf[cur_rp] = new;
- rtw_pci_reset_rx_desc(rtwdev, new, ring, cur_rp, buf_desc_sz);
+next_rp:
+ /* new skb delivered to mac80211, re-enable original skb DMA */
+ rtw_pci_reset_rx_desc(rtwdev, skb, ring, cur_rp, buf_desc_sz);
/* host read next element in ring */
if (++cur_rp >= ring->r.len)
--
2.22.0
Hi all,
I realize this already is merged, and it had some previous review
comments that led to the decisions in this patch, but I'd still like
to ask here, where I think I'm reaching the relevant parties:
On Wed, Jul 10, 2019 at 1:43 AM Jian-Hong Pan <[email protected]> wrote:
...
> This patch allocates a new, data-sized skb first in RX ISR. After
> copying the data in, we pass it to the upper layers. However, if skb
> allocation fails, we effectively drop the frame. In both cases, the
> original, full size ring skb is reused.
>
> In addition, by fixing the kernel crash, the RX routine should now
> generally behave better under low memory conditions.
>
> Buglink: https://bugzilla.kernel.org/show_bug.cgi?id=204053
> Signed-off-by: Jian-Hong Pan <[email protected]>
> Cc: <[email protected]>
> ---
> v2:
> - Allocate new data-sized skb and put data into it, then pass it to
> mac80211. Reuse the original skb in RX ring by DMA sync.
Is it really wise to force an extra memcpy() for *every* delivery?
Isn't there some other strategy that could be used to properly handle
low-memory scenarios while still passing the original buffer up to
higher layers most of the time? Or is it really so bad to keep
re-allocating RTK_PCI_RX_BUF_SIZE (>8KB) of contiguous memory, to
re-fill the RX ring? And if that is so bad, can we reduce the
requirement for contiguous memory instead? (e.g., keep with smaller
buffers, and perform aggregation / scatter-gather only for frames that
are really larger?)
Anyway, that's mostly a long-term thought, as this patch is good for
fixing the important memory errors, even if it's not necessarily the
ideal solution.
Regards,
Brian