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charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: CH0PR11MB5523.namprd11.prod.outlook.com X-MS-Exchange-CrossTenant-Network-Message-Id: df98d65e-1533-44f6-8e4f-08d97124c043 X-MS-Exchange-CrossTenant-originalarrivaltime: 06 Sep 2021 10:54:50.6437 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 46c98d88-e344-4ed4-8496-4ed7712e255d X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: UzpbUJ34SiGhYzNWanrjQJve5Kdp/R9swf+lDeFYyt2mDjxESc1PRTaTiD6+RjIkCoPkco6gAYucPZ2hSVAeOw== X-MS-Exchange-Transport-CrossTenantHeadersStamped: CH2PR11MB4408 X-OriginatorOrg: intel.com Subject: Re: [dpdk-stable] [PATCH] app/testpmd: fix random number of Tx segments X-BeenThere: stable@dpdk.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: patches for DPDK stable branches List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: stable-bounces@dpdk.org Sender: "stable" > -----Original Message----- > From: Zhang, AlvinX > Sent: Monday, September 6, 2021 18:04 > To: Li, Xiaoyun ; Ananyev, Konstantin > > Cc: dev@dpdk.org; stable@dpdk.org > Subject: RE: [PATCH] app/testpmd: fix random number of Tx segments >=20 > > -----Original Message----- > > From: Li, Xiaoyun > > Sent: Monday, September 6, 2021 4:59 PM > > To: Zhang, AlvinX ; Ananyev, Konstantin > > > > Cc: dev@dpdk.org; stable@dpdk.org > > Subject: RE: [PATCH] app/testpmd: fix random number of Tx segments > > > > Hi > > > > > -----Original Message----- > > > From: Zhang, AlvinX > > > Sent: Thursday, September 2, 2021 16:20 > > > To: Li, Xiaoyun ; Ananyev, Konstantin > > > > > > Cc: dev@dpdk.org; Zhang, AlvinX ; > > > stable@dpdk.org > > > Subject: [PATCH] app/testpmd: fix random number of Tx segments > > > > > > When random number of segments in Tx packets is enabled, the total > > > data space length of all segments must be greater or equal than the > > > size of an Eth/IP/UDP/timestamp packet, that's total 14 + 20 + 8 + > > > 16 bytes. Otherwise the Tx engine may cause the application to crash. > > > > > > Bugzilla ID: 797 > > > Fixes: 79bec05b32b7 ("app/testpmd: add ability to split outgoing > > > packets") > > > Cc: stable@dpdk.org > > > > > > Signed-off-by: Alvin Zhang > > > --- > > > app/test-pmd/config.c | 16 +++++++++++----- > > > app/test-pmd/testpmd.c > > > | 5 > > > +++++ app/test-pmd/testpmd.h | 5 +++++ app/test-pmd/txonly.c | > > > +++++ 7 > > > +++++ +++++-- > > > 4 files changed, 26 insertions(+), 7 deletions(-) > > > > > > diff --git a/app/test-pmd/config.c b/app/test-pmd/config.c index > > > 31d8ba1..5105b3b 100644 > > > --- a/app/test-pmd/config.c > > > +++ b/app/test-pmd/config.c > > > @@ -3837,10 +3837,11 @@ struct igb_ring_desc_16_bytes { > > > * Check that each segment length is greater or equal than > > > * the mbuf data size. > > > * Check also that the total packet length is greater or equal than= the > > > - * size of an empty UDP/IP packet (sizeof(struct rte_ether_hdr) + > > > - * 20 + 8). > > > + * size of an Eth/IP/UDP + timestamp packet > > > + * (sizeof(struct rte_ether_hdr) + 20 + 8 + 16). > > > > I don't really agree on this. Most of the time, txonly generate > > packets with Eth/IP/UDP. It's not fair to limit the hdr length to inclu= de > timestamp in all cases. > > And to be honest, I don't see why you need to add > > "tx_pkt_nb_min_segs". It's only used in txonly when > > "TX_PKT_SPLIT_RND". So this issue is because when "TX_PKT_SPLIT_RND", t= he > random nb_segs is not enough for the hdr. > > > > But if you read txonly carefully, if "TX_PKT_SPLIT_RND", the first > > segment length should be equal or greater than 42 (14+20+8). Because > > when "TX_PKT_SPLIT_RND", update_pkt_header() should be called. And > > that function doesn't deal with header in multi-segments. > > I think there's bug here. > > > > So I think you should only add a check in pkt_burst_prepare() in txonly= (). > > if (unlikely(tx_pkt_split =3D=3D TX_PKT_SPLIT_RND) || txonly_multi_flo= w) > > + if (tx_pkt_seg_lengths[0] < 42) { > > + err_log; > > + return false; > > + } > > update_pkt_header(pkt, pkt_len); >=20 > Yes, I didn't notice the updating for the UDP header, but the bug first o= ccurs in > this function copy_buf_to_pkt(&pkt_udp_hdr, sizeof(pkt_udp_hdr), pkt, > sizeof(struct rte_ether_hdr) + > sizeof(struct rte_ipv4_hdr)); > not in update_pkt_header. >=20 > Here we expecting users should set minimum 42 byte for first segment seem= s ok, > But I think we putting the check in configuring the data space length of = first > segment is more graceful. No. You didn't get my point. It's not graceful at all. The segment fault will only happen when "TX_PKT_SPLIT_RND". Because the hdr= may take 2 segs while random nb_segs is only 1. But if it's not "TX_PKT_SPLIT_RND", the current set_tx_pkt_segments() alrea= dy make sure pkt_len is enough for 42. So the only case you need to deal with is "TX_PKT_SPLIT_RND". And since "TX= _PKT_SPLIT_RND" actually needs the first segment to be enough to contain 42= bytes. And in cmd_set_txpkts_parsed, you may not get the configuration to know if = it will be configured as "TX_PKT_SPLIT_RND". That's why you should check be= fore update_pkt_header(). In this way, when it's NOT "TX_PKT_SPLIT_RND", it will maintain the old beh= avior that hdrs may cross several segs which makes more sense. >=20 > > > > As for timestamp, maybe refer to "pkt_copy_split" in csumonly.c is > > better? Copy the extra to the last segment if it's not enough. Not > > sure how to deal with this issue better. > > > > > */ > > > tx_pkt_len =3D 0; > > > + tx_pkt_nb_min_segs =3D 0; > > > for (i =3D 0; i < nb_segs; i++) { > > > if (seg_lengths[i] > mbuf_data_size[0]) { > > > fprintf(stderr, > > > @@ -3849,11 +3850,16 @@ struct igb_ring_desc_16_bytes { > > > return; > > > } > > > tx_pkt_len =3D (uint16_t)(tx_pkt_len + seg_lengths[i]); > > > + > > > + if (!tx_pkt_nb_min_segs && > > > + tx_pkt_len >=3D (sizeof(struct rte_ether_hdr) + 20 + 8 + 16)) > > > + tx_pkt_nb_min_segs =3D i + 1; > > > } > > > - if (tx_pkt_len < (sizeof(struct rte_ether_hdr) + 20 + 8)) { > > > + > > > + if (!tx_pkt_nb_min_segs) { > > > fprintf(stderr, "total packet length=3D%u < %d - give up\n", > > > - (unsigned) tx_pkt_len, > > > - (int)(sizeof(struct rte_ether_hdr) + 20 + 8)); > > > + (unsigned int) tx_pkt_len, > > > + (int)(sizeof(struct rte_ether_hdr) + 20 + 8 + 16)); > > > return; > > > } > > > > > > diff --git a/app/test-pmd/testpmd.c b/app/test-pmd/testpmd.c index > > > 6cbe9ba..c496e59 100644 > > > --- a/app/test-pmd/testpmd.c > > > +++ b/app/test-pmd/testpmd.c > > > @@ -232,6 +232,11 @@ struct fwd_engine * fwd_engines[] =3D { }; > > > uint8_t tx_pkt_nb_segs =3D 1; /**< Number of segments in TXONLY > > > packets */ > > > > > > +/**< Minimum number of segments in TXONLY packets to accommodate > > > +all packet > > > + * headers. > > > + */ > > > +uint8_t tx_pkt_nb_min_segs =3D 1; > > > + > > > enum tx_pkt_split tx_pkt_split =3D TX_PKT_SPLIT_OFF; /**< Split > > > policy for packets to TX. */ > > > > > > diff --git a/app/test-pmd/testpmd.h b/app/test-pmd/testpmd.h index > > > 16a3598..f5bc427 100644 > > > --- a/app/test-pmd/testpmd.h > > > +++ b/app/test-pmd/testpmd.h > > > @@ -464,6 +464,11 @@ enum dcb_mode_enable extern uint16_t > > > tx_pkt_length; /**< Length of TXONLY packet */ extern uint16_t > > > tx_pkt_seg_lengths[RTE_MAX_SEGS_PER_PKT]; /**< Seg. lengths */ > > > extern uint8_t tx_pkt_nb_segs; /**< Number of segments in TX > > > packets */ > > > + > > > +/**< Minimum number of segments in TXONLY packets to accommodate > > > +all packet > > > + * headers. > > > + */ > > > +extern uint8_t tx_pkt_nb_min_segs; > > > extern uint32_t tx_pkt_times_intra; extern uint32_t > > > tx_pkt_times_inter; > > > > > > diff --git a/app/test-pmd/txonly.c b/app/test-pmd/txonly.c index > > > aed820f..27e4458 100644 > > > --- a/app/test-pmd/txonly.c > > > +++ b/app/test-pmd/txonly.c > > > @@ -195,8 +195,11 @@ > > > uint32_t nb_segs, pkt_len; > > > uint8_t i; > > > > > > - if (unlikely(tx_pkt_split =3D=3D TX_PKT_SPLIT_RND)) > > > - nb_segs =3D rte_rand() % tx_pkt_nb_segs + 1; > > > + if (unlikely(tx_pkt_split =3D=3D TX_PKT_SPLIT_RND) && > > > + tx_pkt_nb_segs > tx_pkt_nb_min_segs) > > > + nb_segs =3D rte_rand() % > > > + (tx_pkt_nb_segs - tx_pkt_nb_min_segs + 1) + > > > + tx_pkt_nb_min_segs; > > > else > > > nb_segs =3D tx_pkt_nb_segs; > > > > > > -- > > > 1.8.3.1