Re: [dpdk-dev] [PATCH] kni: fix bug 389 - Crash in librte_kni driver due to noncontiguous pages

[Ferruh Yigit <ferruh.yigit@intel.com>]

On 2/10/2020 7:47 PM, Scott Wasson wrote:
> Fixes: edd2fafbc0b8 ("kni: allocate memory dynamically for each device")
> Cc: iryzhov@nfware.com
> Cc: stable@dpdk.org

I suggest following patch subject:
"kni: fix not contiguous FIFO"

And I little detail in the comment log can be good:
"
KNI requires FIFO to be physically contiguous, with existing
'rte_memzone_reserve()' API this is not guaranteed by default and as a result
KNI rings and packet delivery is broken.

Fixing it by providing 'RTE_MEMZONE_IOVA_CONTIG' flag to ask physically
contiguous memory.
"

And the Fixes tag should show the commit that updates the
'rte_memzone_reserve()' API to not provide physically contiguous memory.
@Anatoly, can you help finding that commit?


> 
> Signed-off-by: Scott Wasson <scott_wasson@affirmednetworks.com>
> ---
>  lib/librte_kni/rte_kni.c |   14 +++++++-------
>  1 files changed, 7 insertions(+), 7 deletions(-)
> 
> diff --git a/lib/librte_kni/rte_kni.c b/lib/librte_kni/rte_kni.c
> index e388751..df4a021 100644
> --- a/lib/librte_kni/rte_kni.c
> +++ b/lib/librte_kni/rte_kni.c
> @@ -145,31 +145,31 @@ enum kni_ops_status {
>  	char mz_name[RTE_MEMZONE_NAMESIZE];
>  
>  	snprintf(mz_name, RTE_MEMZONE_NAMESIZE, KNI_TX_Q_MZ_NAME_FMT, kni->name);
> -	kni->m_tx_q = rte_memzone_reserve(mz_name, KNI_FIFO_SIZE, SOCKET_ID_ANY, 0);
> +	kni->m_tx_q = rte_memzone_reserve(mz_name, KNI_FIFO_SIZE, SOCKET_ID_ANY, RTE_MEMZONE_IOVA_CONTIG);

Can you please break the line, so it doesn't go beyond 80 chars?

>  	KNI_MEM_CHECK(kni->m_tx_q == NULL, tx_q_fail);
>  
>  	snprintf(mz_name, RTE_MEMZONE_NAMESIZE, KNI_RX_Q_MZ_NAME_FMT, kni->name);
> -	kni->m_rx_q = rte_memzone_reserve(mz_name, KNI_FIFO_SIZE, SOCKET_ID_ANY, 0);
> +	kni->m_rx_q = rte_memzone_reserve(mz_name, KNI_FIFO_SIZE, SOCKET_ID_ANY, RTE_MEMZONE_IOVA_CONTIG);
>  	KNI_MEM_CHECK(kni->m_rx_q == NULL, rx_q_fail);
>  
>  	snprintf(mz_name, RTE_MEMZONE_NAMESIZE, KNI_ALLOC_Q_MZ_NAME_FMT, kni->name);
> -	kni->m_alloc_q = rte_memzone_reserve(mz_name, KNI_FIFO_SIZE, SOCKET_ID_ANY, 0);
> +	kni->m_alloc_q = rte_memzone_reserve(mz_name, KNI_FIFO_SIZE, SOCKET_ID_ANY, RTE_MEMZONE_IOVA_CONTIG);
>  	KNI_MEM_CHECK(kni->m_alloc_q == NULL, alloc_q_fail);
>  
>  	snprintf(mz_name, RTE_MEMZONE_NAMESIZE, KNI_FREE_Q_MZ_NAME_FMT, kni->name);
> -	kni->m_free_q = rte_memzone_reserve(mz_name, KNI_FIFO_SIZE, SOCKET_ID_ANY, 0);
> +	kni->m_free_q = rte_memzone_reserve(mz_name, KNI_FIFO_SIZE, SOCKET_ID_ANY, RTE_MEMZONE_IOVA_CONTIG);
>  	KNI_MEM_CHECK(kni->m_free_q == NULL, free_q_fail);
>  
>  	snprintf(mz_name, RTE_MEMZONE_NAMESIZE, KNI_REQ_Q_MZ_NAME_FMT, kni->name);
> -	kni->m_req_q = rte_memzone_reserve(mz_name, KNI_FIFO_SIZE, SOCKET_ID_ANY, 0);
> +	kni->m_req_q = rte_memzone_reserve(mz_name, KNI_FIFO_SIZE, SOCKET_ID_ANY, RTE_MEMZONE_IOVA_CONTIG);
>  	KNI_MEM_CHECK(kni->m_req_q == NULL, req_q_fail);
>  
>  	snprintf(mz_name, RTE_MEMZONE_NAMESIZE, KNI_RESP_Q_MZ_NAME_FMT, kni->name);
> -	kni->m_resp_q = rte_memzone_reserve(mz_name, KNI_FIFO_SIZE, SOCKET_ID_ANY, 0);
> +	kni->m_resp_q = rte_memzone_reserve(mz_name, KNI_FIFO_SIZE, SOCKET_ID_ANY, RTE_MEMZONE_IOVA_CONTIG);
>  	KNI_MEM_CHECK(kni->m_resp_q == NULL, resp_q_fail);
>  
>  	snprintf(mz_name, RTE_MEMZONE_NAMESIZE, KNI_SYNC_ADDR_MZ_NAME_FMT, kni->name);
> -	kni->m_sync_addr = rte_memzone_reserve(mz_name, KNI_FIFO_SIZE, SOCKET_ID_ANY, 0);
> +	kni->m_sync_addr = rte_memzone_reserve(mz_name, KNI_FIFO_SIZE, SOCKET_ID_ANY, RTE_MEMZONE_IOVA_CONTIG);
>  	KNI_MEM_CHECK(kni->m_sync_addr == NULL, sync_addr_fail);
>  
>  	return 0;
>