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ionic: implement support for rx sgl

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Even out Rx performance across MTU sizes by changing from full
skb allocations to page-based frag allocations.  The device
supports a form of scatter-gather in the Rx path, so we can
set up a number of pages for each descriptor, all of which are
easier to alloc and pass around than the standard kzalloc'd
buffer.  An skb is wrapped around the pages while processing
the received packets, and pages are recycled as needed, or
left alone if they weren't used in the Rx.

Signed-off-by: Shannon Nelson <snelson@pensando.io>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Shannon Nelson
2019-10-23 17:48:59 -07:00
committed by David S. Miller
parent 089406bc5a
commit 08f2e4b2b2
3 changed files with 224 additions and 84 deletions
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7
drivers/net/ethernet/pensando/ionic/ionic_dev.h
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@@ -155,12 +155,19 @@ typedef void (*ionic_desc_cb)(struct ionic_queue *q,
struct ionic_desc_info *desc_info,
struct ionic_cq_info *cq_info, void *cb_arg);
struct ionic_page_info {
struct page *page;
dma_addr_t dma_addr;
};
struct ionic_desc_info {
void *desc;
void *sg_desc;
struct ionic_desc_info *next;
unsigned int index;
unsigned int left;
unsigned int npages;
struct ionic_page_info pages[IONIC_RX_MAX_SG_ELEMS + 1];
ionic_desc_cb cb;
void *cb_arg;
};