[dpdk-dev] [PATCH] compressdev: clarify buffer size limitation

[De Lara Guarch, Pablo]

> -----Original Message-----
> From: dev [mailto:dev-bounces at dpdk.org] On Behalf Of Verma, Shally
> Sent: Thursday, May 17, 2018 7:10 AM
> To: Trahe, Fiona <fiona.trahe at intel.com>; dev at dpdk.org
> Cc: De Lara Guarch, Pablo <pablo.de.lara.guarch at intel.com>; Gupta, Ashish
> <Ashish.Gupta at cavium.com>; Sahu, Sunila <Sunila.Sahu at cavium.com>
> Subject: Re: [dpdk-dev] [PATCH] compressdev: clarify buffer size limitation
> 
> 
> 
> >-----Original Message-----
> >From: dev [mailto:dev-bounces at dpdk.org] On Behalf Of Fiona Trahe
> >Sent: 16 May 2018 19:49
> >To: dev at dpdk.org
> >Cc: pablo.de.lara.guarch at intel.com; fiona.trahe at intel.com
> >Subject: [dpdk-dev] [PATCH] compressdev: clarify buffer size limitation
> >
> >Signed-off-by: Fiona Trahe <fiona.trahe at intel.com>
> >---
> > lib/librte_compressdev/rte_comp.h | 11 +++++++++--
> > 1 file changed, 9 insertions(+), 2 deletions(-)
> >
> >diff --git a/lib/librte_compressdev/rte_comp.h
> b/lib/librte_compressdev/rte_comp.h
> >index 4c802195f..9826086b1 100644
> >--- a/lib/librte_compressdev/rte_comp.h
> >+++ b/lib/librte_compressdev/rte_comp.h
> >@@ -295,12 +295,19 @@ struct rte_comp_op {
> > 	struct rte_mbuf *m_src;
> > 	/**< source mbuf
> > 	 * The total size of the input buffer(s) can be retrieved using
> >-	 * rte_pktmbuf_data_len(m_src)
> >+	 * rte_pktmbuf_data_len(m_src). The max data size which can fit in a
> >+	 * single mbuf is limited by the uint16_t rte_mbuf.data_len to 64k-1.
> >+	 * If the input data is bigger than this it can be passed to the PMD in
> >+	 * a chain of mbufs if the PMD's capabilities indicate it supports this.
> > 	 */
> > 	struct rte_mbuf *m_dst;
> > 	/**< destination mbuf
> > 	 * The total size of the output buffer(s) can be retrieved using
> >-	 * rte_pktmbuf_data_len(m_dst)
> >+	 * rte_pktmbuf_data_len(m_dst). The max data size which can fit in a
> >+	 * single mbuf is limited by the uint16_t rte_mbuf.data_len to 64k-1.
> >+	 * If the output data is expected to be bigger than this a chain of
> >+	 * mbufs can be passed to the PMD if the PMD's capabilities indicate
> >+	 * it supports this.
> > 	 */
> [Shally] It will be good idea to add bit more clarification regarding src.offset and
> dst.offset as well, that is, offset is offset from start of very first segment of
> m_src and m_dst in chained bufs.

I'd say there should be a separate patch addressing this comment.
This one looks ok to me.

Acked-by: Pablo de Lara <pablo.de.lara.guarch at intel.com>