kernel/linux.git/drivers/net/ipa/ipa_endpoint.c, branch linux-6.0.y

net: ipa: simplify endpoint transaction completion

2022-06-13T11:01:58+00:00

When a GSI transaction completes, ipa_endpoint_trans_complete() is eventually called. That handles TX and RX completions separately, but ipa_endpoint_tx_complete() is a no-op. Instead, have ipa_endpoint_trans_complete() return immediately for a TX transaction, and incorporate code from ipa_endpoint_rx_complete() to handle RX transactions. Signed-off-by: Alex Elder Signed-off-by: David S. Miller

net: ipa: rename endpoint->trans_tre_max

2022-06-13T11:01:58+00:00

The trans_tre_max field of the IPA endpoint structure is only used to limit the number of fragments allowed for an SKB being prepared for transmission. Recognizing that, rename the field skb_frag_max, and reduce its value by 1. Signed-off-by: Alex Elder Signed-off-by: David S. Miller

net: ipa: rename channel->tlv_count

2022-06-13T11:01:58+00:00

Each GSI channel has a TLV FIFO of a certain size, specified in the configuration data for an AP channel. That size dictates the maximum number of TREs that are allowed in a single transaction. The only way that value is used after initialization is as a limit on the number of TREs in a transaction; calling it "tlv_count" isn't helpful, and in fact gsi_channel_trans_tre_max() exists to sort of abstract it. Instead, rename the channel->tlv_count field trans_tre_max, and get rid of the helper function. Update a couple of comments as well. Signed-off-by: Alex Elder Signed-off-by: David S. Miller

net: ipa: fix page free in ipa_endpoint_replenish_one()

2022-05-28T01:29:50+00:00

Currently the (possibly compound) pages used for receive buffers are freed using __free_pages(). But according to this comment above the definition of that function, that's wrong: If you want to use the page's reference count to decide when to free the allocation, you should allocate a compound page, and use put_page() instead of __free_pages(). Convert the call to __free_pages() in ipa_endpoint_replenish_one() to use put_page() instead. Fixes: 6a606b90153b8 ("net: ipa: allocate transaction in replenish loop") Signed-off-by: Alex Elder Signed-off-by: Jakub Kicinski

net: ipa: fix page free in ipa_endpoint_trans_release()

2022-05-28T01:29:50+00:00

Currently the (possibly compound) page used for receive buffers are freed using __free_pages(). But according to this comment above the definition of that function, that's wrong: If you want to use the page's reference count to decide when to free the allocation, you should allocate a compound page, and use put_page() instead of __free_pages(). Convert the call to __free_pages() in ipa_endpoint_trans_release() to use put_page() instead. Fixes: ed23f02680caa ("net: ipa: define per-endpoint receive buffer size") Signed-off-by: Alex Elder Signed-off-by: Jakub Kicinski

net: ipa: count the number of modem TX endpoints

2022-05-22T19:46:12+00:00

In ipa_endpoint_modem_exception_reset_all(), a high estimate was made of the number of endpoints that need their status register updated. We only used what was needed, so the high estimate didn't matter much. However the next few patches are going to limit the number of commands in a single transaction, and the overestimate would exceed that. So count the number of modem TX endpoints at initialization time, and use it in ipa_endpoint_modem_exception_reset_all(). Signed-off-by: Alex Elder Signed-off-by: David S. Miller

net: ipa: kill gsi_trans_commit_wait_timeout()

2022-05-22T19:46:12+00:00

Since the beginning gsi_trans_commit_wait_timeout() has existed to provide a way to allow waiting a limited time for a transaction to complete. But that function has never been used. In fact, there is no use for this function, because a transaction committed to hardware should *always* complete. The only reason it might not complete is if there were a hardware failure, or perhaps a system configuration error. Furthermore, if a timeout ever did occur, the IPA hardware would be in an indeterminate state, from which there is no recovery. It would require some sort of complete IPA reset, and would require the participation of the modem, and at this time there is no such sequence defined. So get rid of the definition of gsi_trans_commit_wait_timeout(), and update a few comments accordingly. Signed-off-by: Alex Elder Signed-off-by: David S. Miller

net: ipa: specify RX aggregation time limit in config data

2022-05-22T19:46:12+00:00

Don't assume that a 500 microsecond time limit should be used for all receive endpoints that support aggregation. Instead, specify the time limit to use in the configuration data. Set a 500 microsecond limit for all existing RX endpoints, as before. Checking for overflow for the time limit field is a bit complicated. Rather than duplicate a lot of code in ipa_endpoint_data_valid_one(), call WARN() if any value is found to be too large when encoding it. Signed-off-by: Alex Elder Signed-off-by: David S. Miller

net: ipa: support hard aggregation limits

2022-05-22T19:46:12+00:00

Add a new flag for AP receive endpoints that indicates whether a "hard limit" is used as a criterion for closing aggregation. Add comments explaining the difference between "hard" and "soft" aggregation limits. Pass a flag to ipa_aggr_size_kb() so it computes the proper aggregation size value whether using hard or soft limits. Move that function earlier in "ipa_endpoint.c" so it can be used without a forward-reference. Update ipa_endpoint_data_valid_one() so it validates endpoints whose data indicate a hard aggregation limit is used, and so it reports set aggregation flags for endpoints without aggregation enabled. Signed-off-by: Alex Elder Signed-off-by: David S. Miller

net: ipa: make endpoint HOLB drop configurable

2022-05-22T19:46:12+00:00

Add a new Boolean flag for RX endpoints defining whether HOLB drop is initially enabled or disabled for the endpoint. All existing AP endpoints should have HOLB drop disabled. Signed-off-by: Alex Elder Signed-off-by: David S. Miller