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[Launchpad Bug Tracker <1836635@xxxxxxxxxxxxxxxxxx>]

You have been subscribed to a public bug by Mauricio Faria de Oliveira (mfo):

[Impact]

 * Support for Solarflare X2542 network adapter
   (Medford2 / SFC9250) in the Bionic sfc driver.

 * This network adapter is present on recent hardware,
   at least HP 2019 and Dell PowerEdge R740xd systems.

 * On recent-hardware deployments that would rather use
   the Bionic LTS / GA supported kernel and cannot move
   to HWE kernels this adapter is non functional at all.

[Test Case]

 * The X2542 adapter has been exercised with iperf3 and nc
   across 2 hosts on 25G link speed w/ MTUs 1400/1500/9000
   on both directions, for 1 week.

   Its performance is on par with the Cosmic 4.18 kernel
   (which contains all these patches) and the out-of-tree
   driver from the vendor.

 * The 7000 series adapter (for regression testing an old model,
   supported previously) has been exercised with iperf and netperf
   (TCP_STREAM, UDP_STREAM, TCP_RR, UDP_RR, and TCP_CRR) in one
   host (client/server in different adapter ports isolated with
   network namespaces, so traffic goes through the network switch),
   on 10G link speed on MTUs 1500/9000, for 1 weekend.

   No regressions observed between the original and test kernels.

[Regression Potential]

 * The patchset touches a lot of the sfc driver, so the potential
   for regression definitely exists. Thus, a lot of consideration
   and testing happened:

 * It has been tested on other adapter which uses the old code,
   and no regressions were found so far (see 7000 series above).

 * The patchset is exclusively cherry-picks, no single backport.

 * The patchset essentially moves the Bionic driver up in the
   upstream 'git log --oneline -- drivers/net/ethernet/sfc/':

   - since commit d4a7a8893d4c ("sfc: pass valid pointers from efx_enqueue_unwind")
   - until commit 7f61e6c6279b ("sfc: support FEC configuration through ethtool")
   - except for 2 commits (not needed / unrelated)
     - commit 42356d9a137b ("sfc: support RSS spreading of ethtool ntuple filters")
     - commit 9baeb5eb1f83 ("sfc: falcon: remove duplicated bit-wise or of LOOPBACK_SGMII")
   - plus 2 more recent commits (fixes)
     - commit 458bd99e4974 ("sfc: remove ctpio_dmabuf_start from stats")
     - commit 0c235113b3c4 ("sfc: stop the TX queue before pushing new buffers")

** Affects: debian-installer (Ubuntu)
     Importance: Undecided
         Status: Invalid

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: Invalid

** Affects: debian-installer (Ubuntu Bionic)
     Importance: Medium
     Assignee: Mauricio Faria de Oliveira (mfo)
         Status: In Progress

** Affects: linux (Ubuntu Bionic)
     Importance: Undecided
     Assignee: Mauricio Faria de Oliveira (mfo)
         Status: Fix Released

** Affects: debian-installer (Ubuntu Cosmic)
     Importance: Undecided
         Status: Invalid

** Affects: linux (Ubuntu Cosmic)
     Importance: Undecided
         Status: Invalid

** Affects: debian-installer (Ubuntu Disco)
     Importance: Undecided
         Status: Invalid

** Affects: linux (Ubuntu Disco)
     Importance: Undecided
         Status: Invalid

** Affects: debian-installer (Ubuntu Eoan)
     Importance: Undecided
         Status: Invalid

** Affects: linux (Ubuntu Eoan)
     Importance: Undecided
         Status: Invalid


** Tags: sts verification-done-bionic verification-needed-xenial
-- 
Bionic: support for Solarflare X2542 network adapter (sfc driver)
https://bugs.launchpad.net/bugs/1836635
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