[dpdk-dev] [PATCH] fix ceph async messenger runtime bug based on spdk/dpdk

[Ananyev, Konstantin]

Hi Chunmei,

> -----Original Message-----
> From: dev [mailto:dev-bounces at dpdk.org] On Behalf Of chunmei Liu
> Sent: Wednesday, December 13, 2017 11:45 PM
> To: dev at dpdk.org
> Cc: Liu, Chunmei <chunmei.liu at intel.com>
> Subject: [dpdk-dev] [PATCH] fix ceph async messenger runtime bug based on spdk/dpdk
> 
> From: chunmei <chunmei.liu at intel.com>
> 
> ceph async messenger has some run time error with this dpdk library,
> 1) need set rxm->next= null at end of packet since not init it to null
> when allocate a buffer other wise rte_mbuf_sanity_check will report error.
> 2) when check the size, can't calculate mbuf_data_room_size
> because async messenger dpdk will allocate this part later
> not at create mempool.
> 
> Signed-off-by: chunmei Liu <chunmei.liu at intel.com>
> ---
>  drivers/net/ixgbe/ixgbe_rxtx.c | 3 ++-
>  lib/librte_mbuf/rte_mbuf.c     | 3 ++-
>  2 files changed, 4 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/net/ixgbe/ixgbe_rxtx.c b/drivers/net/ixgbe/ixgbe_rxtx.c
> index 1e07895..918946b 100644
> --- a/drivers/net/ixgbe/ixgbe_rxtx.c
> +++ b/drivers/net/ixgbe/ixgbe_rxtx.c
> @@ -2190,7 +2190,8 @@ ixgbe_recv_pkts_lro(void *rx_queue, struct rte_mbuf **rx_pkts, uint16_t nb_pkts,
>  			rxm->next = next_rxe->mbuf;
>  			next_sc_entry->fbuf = first_seg;
>  			goto next_desc;
> -		}
> +		} else
> +			rxm->next = NULL;

Shouldn't be a problem I think, but wonder why do we need it at all?
As I remember, rte_pktmbuf_free_seg() always sets m->next to NULL.
Konstantin 

> 
>  		/* Initialize the first mbuf of the returned packet */
>  		ixgbe_fill_cluster_head_buf(first_seg, &rxd, rxq, staterr);
> diff --git a/lib/librte_mbuf/rte_mbuf.c b/lib/librte_mbuf/rte_mbuf.c
> index 0e3e36a..c01da19 100644
> --- a/lib/librte_mbuf/rte_mbuf.c
> +++ b/lib/librte_mbuf/rte_mbuf.c
> @@ -102,7 +102,6 @@ rte_pktmbuf_pool_init(struct rte_mempool *mp, void *opaque_arg)
>  	}
> 
>  	RTE_ASSERT(mp->elt_size >= sizeof(struct rte_mbuf) +
> -		user_mbp_priv->mbuf_data_room_size +
>  		user_mbp_priv->mbuf_priv_size);
> 
>  	mbp_priv = rte_mempool_get_priv(mp);
> @@ -233,6 +232,8 @@ rte_mbuf_sanity_check(const struct rte_mbuf *m, int is_header)
>  	}
>  	if (nb_segs != 0)
>  		rte_panic("bad nb_segs\n");
> +	if (m_seg != NULL)
> +		rte_panic("bad m_seg\n");
>  }
> 
>  /* dump a mbuf on console */
> --
> 2.7.4