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Add a comment that to clarify how to determine the amount of received DDP

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data.

Reviewed by:	np
Differential Revision:	https://reviews.freebsd.org/D3619
This commit is contained in:
John Baldwin 2015-09-10 21:41:11 +00:00
parent 1fa6712471
commit 8fb15ddb00
1 changed files with 13 additions and 0 deletions
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13
sys/dev/cxgbe/tom/t4_ddp.c
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@ -405,6 +405,19 @@ handle_ddp_data(struct toepcb *toep, __be32 ddp_report, __be32 rcv_nxt, int len)
}
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;