From: Xiaoyun Li <xiaoyun.li@intel.com> To: qi.z.zhang@intel.com, beilei.xing@intel.com, xiaolong.ye@intel.com, dev@dpdk.org Cc: Xiaoyun Li <xiaoyun.li@intel.com>, stable@dpdk.org Subject: [dpdk-stable] [PATCH] net/i40e: fix TSO pkt exceeds allowed buf size issue Date: Mon, 23 Dec 2019 10:55:47 +0800 Message-ID: <20191223025547.88798-1-xiaoyun.li@intel.com> (raw) Hardware limits that max buffer size per tx descriptor should be (16K-1)B. So when TSO enabled, the mbuf data size may exceed the limit and cause malicious behaviour to the NIC. This patch fixes this issue by using more tx descs for this kind of large buffer. Fixes: 4861cde46116 ("i40e: new poll mode driver") Cc: stable@dpdk.org Signed-off-by: Xiaoyun Li <xiaoyun.li@intel.com> --- drivers/net/i40e/i40e_rxtx.c | 29 ++++++++++++++++++++++++++++- 1 file changed, 28 insertions(+), 1 deletion(-) diff --git a/drivers/net/i40e/i40e_rxtx.c b/drivers/net/i40e/i40e_rxtx.c index 17dc8c78f..8269dc022 100644 --- a/drivers/net/i40e/i40e_rxtx.c +++ b/drivers/net/i40e/i40e_rxtx.c @@ -989,6 +989,8 @@ i40e_set_tso_ctx(struct rte_mbuf *mbuf, union i40e_tx_offload tx_offload) return ctx_desc; } +/* HW requires that Tx buffer size ranges from 1B up to (16K-1)B. */ +#define I40E_MAX_DATA_PER_TXD (16 * 1024 - 1) uint16_t i40e_xmit_pkts(void *tx_queue, struct rte_mbuf **tx_pkts, uint16_t nb_pkts) { @@ -1046,8 +1048,15 @@ i40e_xmit_pkts(void *tx_queue, struct rte_mbuf **tx_pkts, uint16_t nb_pkts) * The number of descriptors that must be allocated for * a packet equals to the number of the segments of that * packet plus 1 context descriptor if needed. + * Recalculate the needed tx descs when TSO enabled in case + * the mbuf data size exceeds max data size that hw allows + * per tx desc. */ - nb_used = (uint16_t)(tx_pkt->nb_segs + nb_ctx); + if (ol_flags & PKT_TX_TCP_SEG) + nb_used = (uint16_t)(DIV_ROUND_UP(tx_pkt->data_len, + I40E_MAX_DATA_PER_TXD) + nb_ctx); + else + nb_used = (uint16_t)(tx_pkt->nb_segs + nb_ctx); tx_last = (uint16_t)(tx_id + nb_used - 1); /* Circular ring */ @@ -1160,6 +1169,24 @@ i40e_xmit_pkts(void *tx_queue, struct rte_mbuf **tx_pkts, uint16_t nb_pkts) slen = m_seg->data_len; buf_dma_addr = rte_mbuf_data_iova(m_seg); + while ((ol_flags & PKT_TX_TCP_SEG) && + unlikely(slen > I40E_MAX_DATA_PER_TXD)) { + txd->buffer_addr = + rte_cpu_to_le_64(buf_dma_addr); + txd->cmd_type_offset_bsz = + i40e_build_ctob(td_cmd, + td_offset, I40E_MAX_DATA_PER_TXD, + td_tag); + + buf_dma_addr += I40E_MAX_DATA_PER_TXD; + slen -= I40E_MAX_DATA_PER_TXD; + + txe->last_id = tx_last; + tx_id = txe->next_id; + txe = txn; + txd = &txr[tx_id]; + txn = &sw_ring[txe->next_id]; + } PMD_TX_LOG(DEBUG, "mbuf: %p, TDD[%u]:\n" "buf_dma_addr: %#"PRIx64";\n" "td_cmd: %#x;\n" -- 2.17.1
next reply other threads:[~2019-12-23 2:58 UTC|newest] Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top 2019-12-23 2:55 Xiaoyun Li [this message] 2019-12-26 6:45 ` [dpdk-stable] [PATCH v3] " Xiaoyun Li 2019-12-27 0:24 ` Zhang, Qi Z 2020-01-02 11:23 ` Loftus, Ciara 2020-01-07 1:52 ` [dpdk-stable] [dpdk-dev] " Ye Xiaolong
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