From mboxrd@z Thu Jan 1 00:00:00 1970 From: Ouyang Changchun Subject: [PATCH] vhost: Check descriptor number for vector Rx Date: Fri, 24 Oct 2014 16:38:18 +0800 Message-ID: <1414139898-26562-1-git-send-email-changchun.ouyang@intel.com> To: dev-VfR2kkLFssw@public.gmane.org Return-path: List-Id: patches and discussions about DPDK List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dev-bounces-VfR2kkLFssw@public.gmane.org Sender: "dev" For zero copy, it need check whether RX descriptor num meets the least requirement when using vector PMD Rx function, and give user more hints if it fails to meet the least requirement. Signed-off-by: Changchun Ouyang --- examples/vhost/main.c | 17 +++++++++++++++++ 1 file changed, 17 insertions(+) diff --git a/examples/vhost/main.c b/examples/vhost/main.c index 291128e..87ab854 100644 --- a/examples/vhost/main.c +++ b/examples/vhost/main.c @@ -131,6 +131,10 @@ #define RTE_TEST_RX_DESC_DEFAULT_ZCP 32 /* legacy: 32, DPDK virt FE: 128. */ #define RTE_TEST_TX_DESC_DEFAULT_ZCP 64 /* legacy: 64, DPDK virt FE: 64. */ +#ifdef RTE_IXGBE_INC_VECTOR +#define VPMD_RX_BURST 32 +#endif + /* Get first 4 bytes in mbuf headroom. */ #define MBUF_HEADROOM_UINT32(mbuf) (*(uint32_t *)((uint8_t *)(mbuf) \ + sizeof(struct rte_mbuf))) @@ -792,6 +796,19 @@ us_vhost_parse_args(int argc, char **argv) return -1; } +#ifdef RTE_IXGBE_INC_VECTOR + if ((zero_copy == 1) && (num_rx_descriptor <= VPMD_RX_BURST)) { + RTE_LOG(INFO, VHOST_PORT, + "The RX desc num: %d is too small for PMD to work\n" + "properly, please enlarge it to bigger than %d if\n" + "possible by the option: '--rx-desc-num '\n" + "One alternative is disabling RTE_IXGBE_INC_VECTOR\n" + "in config file and rebuild the libraries.\n", + num_rx_descriptor, VPMD_RX_BURST); + return -1; + } +#endif + return 0; } -- 1.8.4.2