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iwlwifi: pcie: optimise struct iwl_rx_mem_buffer layout 

On 64-bit machines, struct iwl_rx_mem_buffer has a lot of
padding due to the use of pointers after the small items.
Move the list entry before them, and while at it also add
documentation for it.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
Link: https://lore.kernel.org/r/iwlwifi.20210802170640.6a62255b3df0.I47bb36530a3c2cdbd73454c796ce608ee2a32a6c@changeid
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
This commit is contained in:
Johannes Berg 2021-08-02 17:09:37 +03:00 committed by Luca Coelho
parent 2f308f008f
commit 95fe8d89bb
1 changed files with 3 additions and 2 deletions
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5
drivers/net/wireless/intel/iwlwifi/pcie/internal.h
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@ -42,6 +42,7 @@ struct iwl_host_cmd;
* struct iwl_rx_mem_buffer
* @page_dma: bus address of rxb page
* @page: driver's pointer to the rxb page
* @list: list entry for the membuffer
* @invalid: rxb is in driver ownership - not owned by HW
* @vid: index of this rxb in the global table
* @offset: indicates which offset of the page (in bytes)
@ -50,10 +51,10 @@ struct iwl_host_cmd;
struct iwl_rx_mem_buffer {
dma_addr_t page_dma;
struct page *page;
u16 vid;
bool invalid;
struct list_head list;
u32 offset;
u16 vid;
bool invalid;
};
/**