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D3619.id8645.diff
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Index: sys/dev/cxgbe/tom/t4_ddp.c
===================================================================
--- sys/dev/cxgbe/tom/t4_ddp.c
+++ sys/dev/cxgbe/tom/t4_ddp.c
@@ -405,6 +405,19 @@
}
tp = intotcpcb(inp);
+
+ /*
+ * For RX_DDP_COMPLETE, len will be zero and rcv_nxt is the
+ * sequence number of the next byte to receive. The length of
+ * the data received for this message must be computed by
+ * comparing the new and old values of rcv_nxt.
+ *
+ * For RX_DATA_DDP, len might be non-zero, but it is only the
+ * length of the most recent DMA. It does not include the
+ * total length of the data received since the previous update
+ * for this DDP buffer. rcv_nxt is the sequence number of the
+ * first received byte from the most recent DMA.
+ */
len += be32toh(rcv_nxt) - tp->rcv_nxt;
tp->rcv_nxt += len;
tp->t_rcvtime = ticks;
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D3619.id8645.diff (864 B)
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D3619: Clarify how to determine the amount of received DDP data.
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