This patch series is really just an RFC: it won't work as is. I just wanted to share early what we have in the pipe. We enable TSO to get a lot of data at once to build A-MSDUs. Our hardware doesn't have (yet) TCP CSUM offload, so we do it manually. TSO won't be enabled on hardware that don't support CSUM offload in release code, computing TCP CSUM in the driver is just a way to start coding the flows. This is why the "CSUM offload" implementation in the driver in so bad in terms of efficiency. I preferred to have the flows as close as they will be when the hardware will be able to the CSUM than to try to seek efficiency. The hardware that will have CSUM offload will still require the driver to split the skb in software including the IP / TCP header copy and update etc...
I am pretty much a newbie in all the netstack stuff, so I am certain that people out there will have remarks which I will be more than happy to hear. I know that I can use more skb APIs instead of reinventing the wheel, OTOH, for most of the cases, the code was hacky enough to make it easier to touch the skb members than to use the API functions. Of course, suggestions are most welcome. I ran quite a bit of testing on that code. I could run long iperf sessions with lots of A-MSDUs in the air. Corner cases are still failing. E.g. if you put a very small MSS so that the number of DMA descriptors for an A-MSDU starts to be the limit, then at some point, I blow up. Emmanuel Grumbach (8): mac80211: allow the driver to adverise A-MSDU within A-MPDU Rx support mac80211: allow to transmit A-MSDU within A-MPDU mac80211: limit the A-MSDU based on the Extended Capabilities element iwlwifi: mvm: don't adverise SUPPORTS_CLONED_SKBS anymore iwlwifi: mvm: support TSO iwlwifi: mvm: add support for A-MSDU Tx iwlwifi: mvm: allow to configure the maximal size of an A-MSDU iwlwifi: don't send A-MSDU when not allowed by peer Johannes Berg (2): iwlwifi: mvm: pretend to have CSUM OFFLOAD iwlwifi: mvm: move TX PN assignment for CCMP to the driver drivers/net/wireless/iwlwifi/dvm/mac80211.c | 2 +- drivers/net/wireless/iwlwifi/mvm/constants.h | 1 + drivers/net/wireless/iwlwifi/mvm/debugfs.c | 19 + drivers/net/wireless/iwlwifi/mvm/mac80211.c | 17 +- drivers/net/wireless/iwlwifi/mvm/mvm.h | 16 +- drivers/net/wireless/iwlwifi/mvm/sta.c | 6 +- drivers/net/wireless/iwlwifi/mvm/sta.h | 6 +- drivers/net/wireless/iwlwifi/mvm/tdls.c | 12 +- drivers/net/wireless/iwlwifi/mvm/tx.c | 666 ++++++++++++++++++++++++++- drivers/net/wireless/mac80211_hwsim.c | 2 +- include/linux/ieee80211.h | 9 + include/net/mac80211.h | 14 +- net/mac80211/agg-rx.c | 8 +- net/mac80211/agg-tx.c | 15 +- net/mac80211/cfg.c | 23 + net/mac80211/debugfs.c | 1 + net/mac80211/driver-ops.h | 7 +- net/mac80211/sta_info.h | 2 + net/mac80211/trace.h | 10 +- net/mac80211/vht.c | 16 + 20 files changed, 795 insertions(+), 57 deletions(-) -- 2.1.4 -- To unsubscribe from this list: send the line "unsubscribe linux-wireless" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
