<div dir="ltr"><p class="MsoNormal" style="margin:0in;font-size:11pt;font-family:Calibri,sans-serif;color:rgb(0,0,0)">Hello, </p><p class="MsoNormal" style="margin:0in;font-size:11pt;font-family:Calibri,sans-serif;color:rgb(0,0,0)"><br></p><p class="MsoNormal" style="margin:0in;font-size:11pt;font-family:Calibri,sans-serif;color:rgb(0,0,0)">Our application uses the net_netvsc driver in DPDK 21.08 on Azure. We found an issue where RSS doesn’t deliver packets to the correct<span class="gmail-Apple-converted-space"> </span><span class="gmail-SpellE">rx</span><span class="gmail-Apple-converted-space"> </span>queue.<span class="gmail-Apple-converted-space"> </span>The instance type we use is Standard_L80s_v3 with<span class="gmail-Apple-converted-space"> </span><span style="color:rgb(29,28,29)">MT27800 Family [ConnectX-5 Virtual Function] NICs. </span>The NIC is configured with 40<span class="gmail-Apple-converted-space"> </span><span class="gmail-SpellE">rx</span><span class="gmail-Apple-converted-space"> </span>queues and the RETA table is configured (confirmed by<span class="gmail-Apple-converted-space"> </span><span class="gmail-SpellE">rte_eth_dev_rss_reta_query</span>()) as below.</p><p class="MsoNormal" style="margin:0in;font-size:11pt;font-family:Calibri,sans-serif;color:rgb(0,0,0)"> </p><p class="MsoNormal" style="margin:0in;font-size:11pt;font-family:Calibri,sans-serif;color:rgb(0,0,0)"> <span class="gmail-Apple-converted-space"> </span>0:      <span class="gmail-Apple-converted-space"> </span>0   <span class="gmail-Apple-converted-space"> </span>1   <span class="gmail-Apple-converted-space"> </span>2   <span class="gmail-Apple-converted-space"> </span>3   <span class="gmail-Apple-converted-space"> </span>4   <span class="gmail-Apple-converted-space"> </span>5   <span class="gmail-Apple-converted-space"> </span>6   <span class="gmail-Apple-converted-space"> </span>7  <span class="gmail-Apple-converted-space"> </span></p><p class="MsoNormal" style="margin:0in;font-size:11pt;font-family:Calibri,sans-serif;color:rgb(0,0,0)">  8:      <span class="gmail-Apple-converted-space"> </span>8   <span class="gmail-Apple-converted-space"> </span>9  <span class="gmail-Apple-converted-space"> </span>10  <span class="gmail-Apple-converted-space"> </span>11  <span class="gmail-Apple-converted-space"> </span>12  <span class="gmail-Apple-converted-space"> </span>13  <span class="gmail-Apple-converted-space"> </span>14  <span class="gmail-Apple-converted-space"> </span>15 <span class="gmail-Apple-converted-space"> </span></p><p class="MsoNormal" style="margin:0in;font-size:11pt;font-family:Calibri,sans-serif;color:rgb(0,0,0)"> 16:     <span class="gmail-Apple-converted-space"> </span>16  <span class="gmail-Apple-converted-space"> </span>17  <span class="gmail-Apple-converted-space"> </span>18  <span class="gmail-Apple-converted-space"> </span>19  <span class="gmail-Apple-converted-space"> </span>20  <span class="gmail-Apple-converted-space"> </span>21  <span class="gmail-Apple-converted-space"> </span>22  <span class="gmail-Apple-converted-space"> </span>23</p><p class="MsoNormal" style="margin:0in;font-size:11pt;font-family:Calibri,sans-serif;color:rgb(0,0,0)">24:     <span class="gmail-Apple-converted-space"> </span>24  <span class="gmail-Apple-converted-space"> </span>25  <span class="gmail-Apple-converted-space"> </span>26  <span class="gmail-Apple-converted-space"> </span>27  <span class="gmail-Apple-converted-space"> </span>28  <span class="gmail-Apple-converted-space"> </span>29  <span class="gmail-Apple-converted-space"> </span>30  <span class="gmail-Apple-converted-space"> </span>31</p><p class="MsoNormal" style="margin:0in;font-size:11pt;font-family:Calibri,sans-serif;color:rgb(0,0,0)">32:     <span class="gmail-Apple-converted-space"> </span>32  <span class="gmail-Apple-converted-space"> </span>33  <span class="gmail-Apple-converted-space"> </span>34  <span class="gmail-Apple-converted-space"> </span>35  <span class="gmail-Apple-converted-space"> </span>36  <span class="gmail-Apple-converted-space"> </span>37  <span class="gmail-Apple-converted-space"> </span>38  <span class="gmail-Apple-converted-space"> </span>39</p><p class="MsoNormal" style="margin:0in;font-size:11pt;font-family:Calibri,sans-serif;color:rgb(0,0,0)">40:      <span class="gmail-Apple-converted-space"> </span>0   <span class="gmail-Apple-converted-space"> </span>1   <span class="gmail-Apple-converted-space"> </span>2   <span class="gmail-Apple-converted-space"> </span>3   <span class="gmail-Apple-converted-space"> </span>4   <span class="gmail-Apple-converted-space"> </span>5   <span class="gmail-Apple-converted-space"> </span>6   <span class="gmail-Apple-converted-space"> </span>7</p><p class="MsoNormal" style="margin:0in;font-size:11pt;font-family:Calibri,sans-serif;color:rgb(0,0,0)">48:      <span class="gmail-Apple-converted-space"> </span>8   <span class="gmail-Apple-converted-space"> </span>9  <span class="gmail-Apple-converted-space"> </span>10  <span class="gmail-Apple-converted-space"> </span>11  <span class="gmail-Apple-converted-space"> </span>12  <span class="gmail-Apple-converted-space"> </span>13  <span class="gmail-Apple-converted-space"> </span>14  <span class="gmail-Apple-converted-space"> </span>15</p><p class="MsoNormal" style="margin:0in;font-size:11pt;font-family:Calibri,sans-serif;color:rgb(0,0,0)">56:     <span class="gmail-Apple-converted-space"> </span>16  <span class="gmail-Apple-converted-space"> </span>17  <span class="gmail-Apple-converted-space"> </span>18  <span class="gmail-Apple-converted-space"> </span>19  <span class="gmail-Apple-converted-space"> </span>20  <span class="gmail-Apple-converted-space"> </span>21  <span class="gmail-Apple-converted-space"> </span>22  <span class="gmail-Apple-converted-space"> </span>23</p><p class="MsoNormal" style="margin:0in;font-size:11pt;font-family:Calibri,sans-serif;color:rgb(0,0,0)">64:     <span class="gmail-Apple-converted-space"> </span>24  <span class="gmail-Apple-converted-space"> </span>25  <span class="gmail-Apple-converted-space"> </span>26  <span class="gmail-Apple-converted-space"> </span>27  <span class="gmail-Apple-converted-space"> </span>28  <span class="gmail-Apple-converted-space"> </span>29  <span class="gmail-Apple-converted-space"> </span>30  <span class="gmail-Apple-converted-space"> </span>31</p><p class="MsoNormal" style="margin:0in;font-size:11pt;font-family:Calibri,sans-serif;color:rgb(0,0,0)">72:     <span class="gmail-Apple-converted-space"> </span>32  <span class="gmail-Apple-converted-space"> </span>33  <span class="gmail-Apple-converted-space"> </span>34  <span class="gmail-Apple-converted-space"> </span>35  <span class="gmail-Apple-converted-space"> </span>36  <span class="gmail-Apple-converted-space"> </span>37  <span class="gmail-Apple-converted-space"> </span>38  <span class="gmail-Apple-converted-space"> </span>39</p><p class="MsoNormal" style="margin:0in;font-size:11pt;font-family:Calibri,sans-serif;color:rgb(0,0,0)">80:      <span class="gmail-Apple-converted-space"> </span>0   <span class="gmail-Apple-converted-space"> </span>1   <span class="gmail-Apple-converted-space"> </span>2   <span class="gmail-Apple-converted-space"> </span>3   <span class="gmail-Apple-converted-space"> </span>4   <span class="gmail-Apple-converted-space"> </span>5   <span class="gmail-Apple-converted-space"> </span>6   <span class="gmail-Apple-converted-space"> </span>7</p><p class="MsoNormal" style="margin:0in;font-size:11pt;font-family:Calibri,sans-serif;color:rgb(0,0,0)">88:      <span class="gmail-Apple-converted-space"> </span>8   <span class="gmail-Apple-converted-space"> </span>9  <span class="gmail-Apple-converted-space"> </span>10  <span class="gmail-Apple-converted-space"> </span>11  <span class="gmail-Apple-converted-space"> </span>12  <span class="gmail-Apple-converted-space"> </span>13  <span class="gmail-Apple-converted-space"> </span>14  <span class="gmail-Apple-converted-space"> </span>15</p><p class="MsoNormal" style="margin:0in;font-size:11pt;font-family:Calibri,sans-serif;color:rgb(0,0,0)">96:     <span class="gmail-Apple-converted-space"> </span>16  <span class="gmail-Apple-converted-space"> </span>17  <span class="gmail-Apple-converted-space"> </span>18<span class="gmail-Apple-converted-space"> </span>  19  <span class="gmail-Apple-converted-space"> </span>20  <span class="gmail-Apple-converted-space"> </span>21  <span class="gmail-Apple-converted-space"> </span>22  <span class="gmail-Apple-converted-space"> </span>23</p><p class="MsoNormal" style="margin:0in;font-size:11pt;font-family:Calibri,sans-serif;color:rgb(0,0,0)">104:     <span class="gmail-Apple-converted-space"> </span>24  <span class="gmail-Apple-converted-space"> </span>25  <span class="gmail-Apple-converted-space"> </span>26  <span class="gmail-Apple-converted-space"> </span>27  <span class="gmail-Apple-converted-space"> </span>28  <span class="gmail-Apple-converted-space"> </span>29  <span class="gmail-Apple-converted-space"> </span>30  <span class="gmail-Apple-converted-space"> </span>31</p><p class="MsoNormal" style="margin:0in;font-size:11pt;font-family:Calibri,sans-serif;color:rgb(0,0,0)">112:     <span class="gmail-Apple-converted-space"> </span>32  <span class="gmail-Apple-converted-space"> </span>33  <span class="gmail-Apple-converted-space"> </span>34  <span class="gmail-Apple-converted-space"> </span>35  <span class="gmail-Apple-converted-space"> </span>36  <span class="gmail-Apple-converted-space"> </span>37  <span class="gmail-Apple-converted-space"> </span>38  <span class="gmail-Apple-converted-space"> </span>39</p><p class="MsoNormal" style="margin:0in;font-size:11pt;font-family:Calibri,sans-serif;color:rgb(0,0,0)">120:      <span class="gmail-Apple-converted-space"> </span>0   <span class="gmail-Apple-converted-space"> </span>1   <span class="gmail-Apple-converted-space"> </span>2   <span class="gmail-Apple-converted-space"> </span>3   <span class="gmail-Apple-converted-space"> </span>4   <span class="gmail-Apple-converted-space"> </span>5   <span class="gmail-Apple-converted-space"> </span>6   <span class="gmail-Apple-converted-space"> </span>7</p><p class="MsoNormal" style="margin:0in;font-size:11pt;font-family:Calibri,sans-serif;color:rgb(0,0,0)"> </p><p class="MsoNormal" style="margin:0in;font-size:11pt;font-family:Calibri,sans-serif;color:rgb(0,0,0)">One example is a packet received with<span class="gmail-Apple-converted-space"> </span><span class="gmail-SpellE">rss</span><span class="gmail-Apple-converted-space"> </span>key 0xEDE25D84 was incorrectly delivered to<span class="gmail-Apple-converted-space"> </span><span class="gmail-SpellE">rx</span><span class="gmail-Apple-converted-space"> </span>queue 12. We expect it to be queue 4 as 0xEDE25D84 & 0x7F = 4 assuming seven of the least significant bits (LSBs) are used for indexing into the RETA table. <span class="gmail-Apple-converted-space"> </span>Is it a bug or we made a wrong assumption on how the RETA table is accessed with that device?</p><p class="MsoNormal" style="margin:0in;font-size:11pt;font-family:Calibri,sans-serif;color:rgb(0,0,0)"><br></p><p class="MsoNormal" style="margin:0in;font-size:11pt;font-family:Calibri,sans-serif;color:rgb(0,0,0)">Thank you.</p><p class="MsoNormal" style="margin:0in;font-size:11pt;font-family:Calibri,sans-serif;color:rgb(0,0,0)">Yang</p></div>