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Date: Thu, 30 Nov 2023 05:23:15 +0000 From: "Pucha, HimasekharX Reddy" <himasekharx.reddy.pucha@...el.com> To: ivecera <ivecera@...hat.com>, "intel-wired-lan@...ts.osuosl.org" <intel-wired-lan@...ts.osuosl.org> CC: "Drewek, Wojciech" <wojciech.drewek@...el.com>, "netdev@...r.kernel.org" <netdev@...r.kernel.org>, "Brandeburg, Jesse" <jesse.brandeburg@...el.com>, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, Eric Dumazet <edumazet@...gle.com>, "Nguyen, Anthony L" <anthony.l.nguyen@...el.com>, Simon Horman <horms@...nel.org>, "Keller, Jacob E" <jacob.e.keller@...el.com>, Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, "David S . Miller" <davem@...emloft.net> Subject: RE: [Intel-wired-lan] [PATCH v5 5/5] i40e: Remove VEB recursion > -----Original Message----- > From: Intel-wired-lan <intel-wired-lan-bounces@...osl.org> On Behalf Of Ivan Vecera > Sent: Friday, November 24, 2023 8:34 PM > To: intel-wired-lan@...ts.osuosl.org > Cc: Drewek, Wojciech <wojciech.drewek@...el.com>; netdev@...r.kernel.org; Brandeburg, Jesse <jesse.brandeburg@...el.com>; linux-kernel@...r.kernel.org; Eric Dumazet <edumazet@...gle.com>; Nguyen, Anthony L <anthony.l.nguyen@...el.com>; Simon Horman <horms@...nel.org>; Keller, Jacob E <jacob.e.keller@...el.com>; Jakub Kicinski <kuba@...nel.org>; Paolo Abeni <pabeni@...hat.com>; David S . Miller <davem@...emloft.net> > Subject: [Intel-wired-lan] [PATCH v5 5/5] i40e: Remove VEB recursion > > The VEB (virtual embedded switch) as a switch element can be > connected according datasheet though its uplink to: > - Physical port > - Port Virtualizer (not used directly by i40e driver but can > be present in MFP mode where the physical port is shared > between PFs) > - No uplink (aka floating VEB) > > But VEB uplink cannot be connected to another VEB and any attempt > to do so results in: > > "i40e 0000:02:00.0: couldn't add VEB, err -EIO aq_err I40E_AQ_RC_ENOENT" > > that indicates "the uplink SEID does not point to valid element". > > Remove this logic from the driver code this way: > > 1) For debugfs only allow to build floating VEB (uplink_seid == 0) > or main VEB (uplink_seid == mac_seid) > 2) Do not recurse in i40e_veb_link_event() as no VEB cannot have > sub-VEBs > 3) Ditto for i40e_veb_rebuild() + simplify the function as we know > that the VEB for rebuild can be only the main LAN VEB or some > of the floating VEBs > 4) In i40e_rebuild() there is no need to check veb->uplink_seid > as the possible ones are 0 and MAC SEID > 5) In i40e_vsi_release() do not take into account VEBs whose > uplink is another VEB as this is not possible > 6) Remove veb_idx field from i40e_veb as a VEB cannot have > sub-VEBs > > Tested using i40e debugfs interface: > 1) Initial state > [root@...-03 net-next]# CMD="/sys/kernel/debug/i40e/0000:02:00.0/command" > [root@...-03 net-next]# echo dump switch > $CMD > [root@...-03 net-next]# dmesg -c > [ 98.440641] i40e 0000:02:00.0: header: 3 reported 3 total > [ 98.446053] i40e 0000:02:00.0: type=19 seid=392 uplink=160 downlink=16 > [ 98.452593] i40e 0000:02:00.0: type=17 seid=160 uplink=2 downlink=0 > [ 98.458856] i40e 0000:02:00.0: type=19 seid=390 uplink=160 downlink=16 > > 2) Add floating VEB > [root@...-03 net-next]# echo add relay > $CMD > [root@...-03 net-next]# dmesg -c > [ 122.745630] i40e 0000:02:00.0: added relay 162 > [root@...-03 net-next]# echo dump switch > $CMD > [root@...-03 net-next]# dmesg -c > [ 136.650049] i40e 0000:02:00.0: header: 4 reported 4 total > [ 136.655466] i40e 0000:02:00.0: type=19 seid=392 uplink=160 downlink=16 > [ 136.661994] i40e 0000:02:00.0: type=17 seid=160 uplink=2 downlink=0 > [ 136.668264] i40e 0000:02:00.0: type=19 seid=390 uplink=160 downlink=16 > [ 136.674787] i40e 0000:02:00.0: type=17 seid=162 uplink=0 downlink=0 > > 3) Add VMDQ2 VSI to this new VEB > [root@...-03 net-next]# dmesg -c > [ 168.351763] i40e 0000:02:00.0: added VSI 394 to relay 162 > [ 168.374652] enp2s0f0np0v0: NIC Link is Up, 40 Gbps Full Duplex, Flow Control: None > [root@...-03 net-next]# echo dump switch > $CMD > [root@...-03 net-next]# dmesg -c > [ 195.683204] i40e 0000:02:00.0: header: 5 reported 5 total > [ 195.688611] i40e 0000:02:00.0: type=19 seid=394 uplink=162 downlink=16 > [ 195.695143] i40e 0000:02:00.0: type=17 seid=162 uplink=0 downlink=0 > [ 195.701410] i40e 0000:02:00.0: type=19 seid=392 uplink=160 downlink=16 > [ 195.707935] i40e 0000:02:00.0: type=17 seid=160 uplink=2 downlink=0 > [ 195.714201] i40e 0000:02:00.0: type=19 seid=390 uplink=160 downlink=16 > > 4) Try to delete the VEB > [root@...-03 net-next]# echo del relay 162 > $CMD > [root@...-03 net-next]# dmesg -c > [ 239.260901] i40e 0000:02:00.0: deleting relay 162 > [ 239.265621] i40e 0000:02:00.0: can't remove VEB 162 with 1 VSIs left > > 5) Do PF reset and check switch status after rebuild > [root@...-03 net-next]# echo pfr > $CMD > [root@...-03 net-next]# echo dump switch > $CMD > [root@...-03 net-next]# dmesg -c > ... > [ 272.333655] i40e 0000:02:00.0: header: 5 reported 5 total > [ 272.339066] i40e 0000:02:00.0: type=19 seid=394 uplink=162 downlink=16 > [ 272.345599] i40e 0000:02:00.0: type=17 seid=162 uplink=0 downlink=0 > [ 272.351862] i40e 0000:02:00.0: type=19 seid=392 uplink=160 downlink=16 > [ 272.358387] i40e 0000:02:00.0: type=17 seid=160 uplink=2 downlink=0 > [ 272.364654] i40e 0000:02:00.0: type=19 seid=390 uplink=160 downlink=16 > > 6) Delete VSI and delete VEB > [ 297.199116] i40e 0000:02:00.0: deleting VSI 394 > [ 299.807580] i40e 0000:02:00.0: deleting relay 162 > [ 309.767905] i40e 0000:02:00.0: header: 3 reported 3 total > [ 309.773318] i40e 0000:02:00.0: type=19 seid=392 uplink=160 downlink=16 > [ 309.779845] i40e 0000:02:00.0: type=17 seid=160 uplink=2 downlink=0 > [ 309.786111] i40e 0000:02:00.0: type=19 seid=390 uplink=160 downlink=16 > > Reviewed-by: Wojciech Drewek <wojciech.drewek@...el.com> > Signed-off-by: Ivan Vecera <ivecera@...hat.com> > --- > drivers/net/ethernet/intel/i40e/i40e.h | 1 - > .../net/ethernet/intel/i40e/i40e_debugfs.c | 8 +- > drivers/net/ethernet/intel/i40e/i40e_main.c | 176 ++++++++---------- > 3 files changed, 76 insertions(+), 109 deletions(-) > Tested-by: Pucha Himasekhar Reddy <himasekharx.reddy.pucha@...el.com> (A Contingent worker at Intel)
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