Merge branch 'tcp-coalesce-merge-timestamps'
Martin KaFai Lau says: ==================== tcp: Merge timestamp info when coalescing skbs This series is separated from the RFC series related to tcp_sendmsg(MSG_EOR) and it is targeting for the net branch. This patchset is focusing on fixing cases where TCP timestamp could be lost after coalescing skbs. A BPF prog is used to kprobe to sock_queue_err_skb() and print out the value of serr->ee.ee_data. The BPF prog (run-able from bcc) is attached here: BPF prog used for testing: ~~~~~ from __future__ import print_function from bcc import BPF bpf_text = """ int trace_err_skb(struct pt_regs *ctx) { struct sk_buff *skb = (struct sk_buff *)ctx->si; struct sock *sk = (struct sock *)ctx->di; struct sock_exterr_skb *serr; u32 ee_data = 0; if (!sk || !skb) return 0; serr = SKB_EXT_ERR(skb); bpf_probe_read(&ee_data, sizeof(ee_data), &serr->ee.ee_data); bpf_trace_printk("ee_data:%u\\n", ee_data); return 0; }; """ b = BPF(text=bpf_text) b.attach_kprobe(event="sock_queue_err_skb", fn_name="trace_err_skb") print("Attached to kprobe") b.trace_print() ==================== Signed-off-by: David S. Miller <davem@davemloft.net>
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commit
5bec11cf44
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@ -552,6 +552,8 @@ void tcp_send_ack(struct sock *sk);
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void tcp_send_delayed_ack(struct sock *sk);
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void tcp_send_loss_probe(struct sock *sk);
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bool tcp_schedule_loss_probe(struct sock *sk);
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void tcp_skb_collapse_tstamp(struct sk_buff *skb,
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const struct sk_buff *next_skb);
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/* tcp_input.c */
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void tcp_resume_early_retransmit(struct sock *sk);
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@ -1309,6 +1309,7 @@ static bool tcp_shifted_skb(struct sock *sk, struct sk_buff *skb,
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if (skb == tcp_highest_sack(sk))
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tcp_advance_highest_sack(sk, skb);
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tcp_skb_collapse_tstamp(prev, skb);
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tcp_unlink_write_queue(skb, sk);
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sk_wmem_free_skb(sk, skb);
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@ -2441,6 +2441,20 @@ u32 __tcp_select_window(struct sock *sk)
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return window;
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}
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void tcp_skb_collapse_tstamp(struct sk_buff *skb,
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const struct sk_buff *next_skb)
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{
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const struct skb_shared_info *next_shinfo = skb_shinfo(next_skb);
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u8 tsflags = next_shinfo->tx_flags & SKBTX_ANY_TSTAMP;
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if (unlikely(tsflags)) {
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struct skb_shared_info *shinfo = skb_shinfo(skb);
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shinfo->tx_flags |= tsflags;
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shinfo->tskey = next_shinfo->tskey;
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}
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}
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/* Collapses two adjacent SKB's during retransmission. */
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static void tcp_collapse_retrans(struct sock *sk, struct sk_buff *skb)
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{
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@ -2484,6 +2498,8 @@ static void tcp_collapse_retrans(struct sock *sk, struct sk_buff *skb)
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tcp_adjust_pcount(sk, next_skb, tcp_skb_pcount(next_skb));
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tcp_skb_collapse_tstamp(skb, next_skb);
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sk_wmem_free_skb(sk, next_skb);
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}
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