> -----Original Message----- > From: Leon Romanovsky <leon@xxxxxxxxxx> > Sent: Monday, May 8, 2023 2:10 AM > To: Haiyang Zhang <haiyangz@xxxxxxxxxxxxx> > Cc: Long Li <longli@xxxxxxxxxxxxx>; Jason Gunthorpe <jgg@xxxxxxxx>; Ajay > Sharma <sharmaajay@xxxxxxxxxxxxx>; Dexuan Cui <decui@xxxxxxxxxxxxx>; > KY Srinivasan <kys@xxxxxxxxxxxxx>; Wei Liu <wei.liu@xxxxxxxxxx>; David S. > Miller <davem@xxxxxxxxxxxxx>; Eric Dumazet <edumazet@xxxxxxxxxx>; > Jakub Kicinski <kuba@xxxxxxxxxx>; Paolo Abeni <pabeni@xxxxxxxxxx>; linux- > rdma@xxxxxxxxxxxxxxx; linux-hyperv@xxxxxxxxxxxxxxx; > netdev@xxxxxxxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx > Subject: Re: [PATCH] RDMA/mana_ib: Use v2 version of cfg_rx_steer_req to > enable RX coalescing > > On Sun, May 07, 2023 at 09:39:27PM +0000, Haiyang Zhang wrote: > > > > > > > -----Original Message----- > > > From: Leon Romanovsky <leon@xxxxxxxxxx> > > > Sent: Sunday, May 7, 2023 4:11 AM > > > To: Long Li <longli@xxxxxxxxxxxxx> > > > Cc: Jason Gunthorpe <jgg@xxxxxxxx>; Ajay Sharma > > > <sharmaajay@xxxxxxxxxxxxx>; Dexuan Cui <decui@xxxxxxxxxxxxx>; KY > > > Srinivasan <kys@xxxxxxxxxxxxx>; Haiyang Zhang > <haiyangz@xxxxxxxxxxxxx>; > > > Wei Liu <wei.liu@xxxxxxxxxx>; David S. Miller <davem@xxxxxxxxxxxxx>; Eric > > > Dumazet <edumazet@xxxxxxxxxx>; Jakub Kicinski <kuba@xxxxxxxxxx>; > Paolo > > > Abeni <pabeni@xxxxxxxxxx>; linux-rdma@xxxxxxxxxxxxxxx; linux- > > > hyperv@xxxxxxxxxxxxxxx; netdev@xxxxxxxxxxxxxxx; linux- > > > kernel@xxxxxxxxxxxxxxx > > > Subject: Re: [PATCH] RDMA/mana_ib: Use v2 version of cfg_rx_steer_req > to > > > enable RX coalescing > > > > > > On Fri, May 05, 2023 at 11:51:48AM -0700, longli@xxxxxxxxxxxxxxxxx > > > wrote: > > > > From: Long Li <longli@xxxxxxxxxxxxx> > > > > > > > > With RX coalescing, one CQE entry can be used to indicate multiple > packets > > > > on the receive queue. This saves processing time and PCI bandwidth over > > > > the CQ. > > > > > > > > Signed-off-by: Long Li <longli@xxxxxxxxxxxxx> > > > > --- > > > > drivers/infiniband/hw/mana/qp.c | 5 ++++- > > > > include/net/mana/mana.h | 17 +++++++++++++++++ > > > > 2 files changed, 21 insertions(+), 1 deletion(-) > > > > > > Why didn't you change mana_cfg_vport_steering() too? > > > > The mana_cfg_vport_steering() is for mana_en (Enthernet) driver, not the > > mana_ib driver. > > > > The changes for mana_en will be done in a separate patch together with > > changes for mana_en RX code patch to support multiple packets / CQE. > > I'm aware of the difference between mana_en and mana_ib. > > The change you proposed doesn't depend on "support multiple packets / > CQE." > and works perfectly with one packet/CQE also, does it? No. If we add the following setting to the mana_en / mana_cfg_vport_steering(), the NIC may put multiple packets in one CQE, so we need to have the changes for mana_en RX code path to support multiple packets / CQE. + req->cqe_coalescing_enable = true; So we plan to set this cqe_coalescing_enable, and the changes for mana_en RX code path to support multiple packets / CQE in another patch. Thanks, - Haiyang
