From 1668e87d4d51e9f4c333dcafa0c3e189b1eaee35 Mon Sep 17 00:00:00 2001 From: Ciara Loftus Date: Thu, 13 Feb 2020 08:49:14 +0000 Subject: [PATCH] net/af_xdp: fix maximum MTU The maximum MTU for af_xdp zero copy is equal to the page size less the frame overhead introduced by AF_XDP (XDP HR = 256) and DPDK (frame headroom = 320). The patch updates this value to reflect this. This change also makes it possible to remove unneeded constants for both zero-copy and copy mode. Fixes: d8a210774e1d ("net/af_xdp: support unaligned umem chunks") Cc: stable@dpdk.org Signed-off-by: Ciara Loftus Reviewed-by: Xiaolong Ye --- drivers/net/af_xdp/rte_eth_af_xdp.c | 23 +++++++++++------------ 1 file changed, 11 insertions(+), 12 deletions(-) diff --git a/drivers/net/af_xdp/rte_eth_af_xdp.c b/drivers/net/af_xdp/rte_eth_af_xdp.c index a0edfc3cd3..06124ba789 100644 --- a/drivers/net/af_xdp/rte_eth_af_xdp.c +++ b/drivers/net/af_xdp/rte_eth_af_xdp.c @@ -58,13 +58,6 @@ static int af_xdp_logtype; #define ETH_AF_XDP_FRAME_SIZE 2048 #define ETH_AF_XDP_NUM_BUFFERS 4096 -#ifdef XDP_UMEM_UNALIGNED_CHUNK_FLAG -#define ETH_AF_XDP_MBUF_OVERHEAD 128 /* sizeof(struct rte_mbuf) */ -#define ETH_AF_XDP_DATA_HEADROOM \ - (ETH_AF_XDP_MBUF_OVERHEAD + RTE_PKTMBUF_HEADROOM) -#else -#define ETH_AF_XDP_DATA_HEADROOM 0 -#endif #define ETH_AF_XDP_DFLT_NUM_DESCS XSK_RING_CONS__DEFAULT_NUM_DESCS #define ETH_AF_XDP_DFLT_START_QUEUE_IDX 0 #define ETH_AF_XDP_DFLT_QUEUE_COUNT 1 @@ -601,7 +594,14 @@ eth_dev_info(struct rte_eth_dev *dev, struct rte_eth_dev_info *dev_info) dev_info->max_tx_queues = internals->queue_cnt; dev_info->min_mtu = RTE_ETHER_MIN_MTU; - dev_info->max_mtu = ETH_AF_XDP_FRAME_SIZE - ETH_AF_XDP_DATA_HEADROOM; +#if defined(XDP_UMEM_UNALIGNED_CHUNK_FLAG) + dev_info->max_mtu = getpagesize() - + sizeof(struct rte_mempool_objhdr) - + sizeof(struct rte_mbuf) - + RTE_PKTMBUF_HEADROOM - XDP_PACKET_HEADROOM; +#else + dev_info->max_mtu = ETH_AF_XDP_FRAME_SIZE - XDP_PACKET_HEADROOM; +#endif dev_info->default_rxportconf.nb_queues = 1; dev_info->default_txportconf.nb_queues = 1; @@ -803,7 +803,7 @@ xsk_umem_info *xdp_umem_configure(struct pmd_internals *internals, .fill_size = ETH_AF_XDP_DFLT_NUM_DESCS, .comp_size = ETH_AF_XDP_DFLT_NUM_DESCS, .frame_size = ETH_AF_XDP_FRAME_SIZE, - .frame_headroom = ETH_AF_XDP_DATA_HEADROOM }; + .frame_headroom = 0 }; char ring_name[RTE_RING_NAMESIZE]; char mz_name[RTE_MEMZONE_NAMESIZE]; int ret; @@ -828,8 +828,7 @@ xsk_umem_info *xdp_umem_configure(struct pmd_internals *internals, for (i = 0; i < ETH_AF_XDP_NUM_BUFFERS; i++) rte_ring_enqueue(umem->buf_ring, - (void *)(i * ETH_AF_XDP_FRAME_SIZE + - ETH_AF_XDP_DATA_HEADROOM)); + (void *)(i * ETH_AF_XDP_FRAME_SIZE)); snprintf(mz_name, sizeof(mz_name), "af_xdp_umem_%s_%u", internals->if_name, rxq->xsk_queue_idx); @@ -938,7 +937,7 @@ eth_rx_queue_setup(struct rte_eth_dev *dev, /* Now get the space available for data in the mbuf */ buf_size = rte_pktmbuf_data_room_size(mb_pool) - RTE_PKTMBUF_HEADROOM; - data_size = ETH_AF_XDP_FRAME_SIZE - ETH_AF_XDP_DATA_HEADROOM; + data_size = ETH_AF_XDP_FRAME_SIZE; if (data_size > buf_size) { AF_XDP_LOG(ERR, "%s: %d bytes will not fit in mbuf (%d bytes)\n", -- 2.20.1