Function tap_gso_ctx_setup

dpdk/drivers/net/tap/rte_eth_tap.c:1433–1477

}

static int
tap_gso_ctx_setup(struct rte_gso_ctx *gso_ctx, struct rte_eth_dev *dev)
{
	uint32_t gso_types;
	char pool_name[64];
	struct pmd_internals *pmd = dev->data->dev_private;
	int ret;

	/* initialize GSO context */
	gso_types = RTE_ETH_TX_OFFLOAD_TCP_TSO;
	if (!pmd->gso_ctx_mp) {
		/*
		 * Create private mbuf pool with TAP_GSO_MBUF_SEG_SIZE
		 * bytes size per mbuf use this pool for both direct and
		 * indirect mbufs
		 */
		ret = snprintf(pool_name, sizeof(pool_name), "mp_%s",
				dev->device->name);
		if (ret < 0 || ret >= (int)sizeof(pool_name)) {
			TAP_LOG(ERR,
				"%s: failed to create mbuf pool name for device %s,"
				"device name too long or output error, ret: %d\n",
				pmd->name, dev->device->name, ret);
			return -ENAMETOOLONG;
		}
		pmd->gso_ctx_mp = rte_pktmbuf_pool_create(pool_name,
			TAP_GSO_MBUFS_NUM, TAP_GSO_MBUF_CACHE_SIZE, 0,
			RTE_PKTMBUF_HEADROOM + TAP_GSO_MBUF_SEG_SIZE,
			SOCKET_ID_ANY);
		if (!pmd->gso_ctx_mp) {
			TAP_LOG(ERR,
				"%s: failed to create mbuf pool for device %s\n",
				pmd->name, dev->device->name);
			return -1;
		}
	}

	gso_ctx->direct_pool = pmd->gso_ctx_mp;
	gso_ctx->indirect_pool = pmd->gso_ctx_mp;
	gso_ctx->gso_types = gso_types;
	gso_ctx->gso_size = 0; /* gso_size is set in tx_burst() per packet */
	gso_ctx->flag = 0;

	return 0;
}

static int
tap_setup_queue(struct rte_eth_dev *dev,