This allows to release the backpressure on the socket only
when the last segment is released.
Now the truesize looks like this:
if the truesize of the original skb is 65420, all the
segments will have a truesize of 704 (skb itself) and the
last one will have 65420.
Change-Id: I3c894cf2afc0aedfe7b2a5b992ba41653ff79c0e
Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@xxxxxxxxx>
---
drivers/net/wireless/iwlwifi/mvm/tx.c | 17 ++++++++++++++++-
1 file changed, 16 insertions(+), 1 deletion(-)
diff --git a/drivers/net/wireless/iwlwifi/mvm/tx.c b/drivers/net/wireless/iwlwifi/mvm/tx.c
index 5046833..2aeb5fd 100644
--- a/drivers/net/wireless/iwlwifi/mvm/tx.c
+++ b/drivers/net/wireless/iwlwifi/mvm/tx.c
@@ -764,7 +764,7 @@ static int iwl_mvm_tx_tso(struct iwl_mvm *mvm, struct sk_buff *skb_gso,
bool ipv6 = skb_shinfo(skb_gso)->gso_type & SKB_GSO_TCPV6;
struct iwl_lso_splitter s = {};
struct page *hdr_page;
- unsigned int mpdu_sz;
+ unsigned int mpdu_sz, sum_truesize = 0;
u8 *hdr_page_pos, *qc, tid;
int i, ret;
@@ -898,6 +898,7 @@ static int iwl_mvm_tx_tso(struct iwl_mvm *mvm, struct sk_buff *skb_gso,
mpdu_sz, tcp_hdrlen(skb_gso));
__skb_queue_tail(mpdus_skb, skb_gso);
+ sum_truesize += skb_gso->truesize;
/* mss bytes have been consumed from the data */
s.gso_payload_pos = s.mss;
@@ -1034,6 +1035,20 @@ static int iwl_mvm_tx_tso(struct iwl_mvm *mvm, struct sk_buff *skb_gso,
}
__skb_queue_tail(mpdus_skb, skb);
+ sum_truesize += skb->truesize;
+ }
+
+ /* Release the backpressure on the socket only when
+ * the last segment is released.
+ */
+ if (skb_gso->destructor) {
+ struct sk_buff *tail = mpdus_skb->prev;
+
+ swap(tail->truesize, skb_gso->truesize);
+ swap(tail->destructor, skb_gso->destructor);
+ swap(tail->sk, skb_gso->sk);
+ atomic_add(sum_truesize - skb_gso->truesize,
+ &skb_gso->sk->sk_wmem_alloc);
}
ret = 0;
--
2.1.4
--
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