[ovs-dev] [PATCH 3/5] lib/dp-packet: Fix data_len issue with multi-segments
仇大玉
qiudayu at chinac.com
Tue Jun 27 01:55:43 UTC 2017
在 2017/6/26 23:08, Kavanagh, Mark B 写道:
>> From: Michael Qiu [mailto:qdy220091330 at gmail.com]
>> Sent: Monday, June 19, 2017 6:29 AM
>> To: dev at openvswitch.org
>> Cc: Kavanagh, Mark B <mark.b.kavanagh at intel.com>; blp at ovn.org; dball at vmware.com; Michael Qiu
>> <qiudayu at chinac.com>; Ksiadz, MarcinX <marcinx.ksiadz at intel.com>; Lal, PrzemyslawX
>> <przemyslawx.lal at intel.com>; Yuanhan Liu <yuanhan.liu at linux.intel.com>
>> Subject: [PATCH 3/5] lib/dp-packet: Fix data_len issue with multi-segments
>>
>> From: Michael Qiu <qiudayu at chinac.com>
>>
>> When a packet is from DPDK source, and it contains
>> multiple segments, data_len is not equal to the
>> packet size. This patch fix this issue.
>>
>> Co-authored-by: Mark Kavanagh <mark.b.kavanagh at intel.com>
>> Co-authored-by: Yuanhan Liu <yuanhan.liu at linux.intel.com>
>> Co-authored-by: Przemyslaw Lal <przemyslawx.lal at intel.com>
> Missing co-authors here (each 'Signed-off-by' tag requires a corresponding 'Co-authored-by' tag ).
OK, I just copy them from the original patch, I will add all tags.
>> Signed-off-by: Michael Qiu <qiudayu at chinac.com>
>> Signed-off-by: Marcin Ksiadz <marcinx.ksiadz at intel.com>
>> Signed-off-by: Mark Kavanagh <mark.b.kavanagh at intel.com>
>> Signed-off-by: Przemyslaw Lal <przemyslawx.lal at intel.com>
>> Signed-off-by: Yuanhan Liu <yuanhan.liu at linux.intel.com>
>> ---
>> lib/dp-packet.h | 18 ++++++++----------
>> 1 file changed, 8 insertions(+), 10 deletions(-)
>>
>> diff --git a/lib/dp-packet.h b/lib/dp-packet.h
>> index d2549b1..fc0b0b4 100644
>> --- a/lib/dp-packet.h
>> +++ b/lib/dp-packet.h
>> @@ -23,6 +23,7 @@
>> #ifdef DPDK_NETDEV
>> #include <rte_config.h>
>> #include <rte_mbuf.h>
>> +#include "rte_ether.h"
>> #endif
>>
>> #include "netdev-dpdk.h"
>> @@ -425,17 +426,14 @@ dp_packet_size(const struct dp_packet *b)
>> static inline void
>> dp_packet_set_size(struct dp_packet *b, uint32_t v)
>> {
>> - /* netdev-dpdk does not currently support segmentation; consequently, for
>> - * all intents and purposes, 'data_len' (16 bit) and 'pkt_len' (32 bit) may
>> - * be used interchangably.
>> - *
>> - * On the datapath, it is expected that the size of packets
>> - * (and thus 'v') will always be <= UINT16_MAX; this means that there is no
>> - * loss of accuracy in assigning 'v' to 'data_len'.
>> + /*
>> + * Assign current segment length. If total length is greater than
>> + * max data length in a segment, additional calculation is needed
>> */
>> - b->mbuf.data_len = (uint16_t)v; /* Current seg length. */
>> - b->mbuf.pkt_len = v; /* Total length of all segments linked to
>> - * this segment. */
>> + b->mbuf.data_len = MIN(v, b->mbuf.buf_len - b->mbuf.data_off);
>> +
>> + /* Total length of all segments linked to this segment. */
>> + b->mbuf.pkt_len = v;
>> }
>>
>> static inline uint16_t
>> --
>> 1.8.3.1
>
--
仇大玉 | Michael
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