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Correct a mismatch between rx_page_buf_step and the actual step size
used when filling buffer pages.
This patch fixes the page overrun that occured when the MTU was set to
anything bigger than 1692.
Fixes: 3990a8fffb ("sfc: allocate channels for XDP tx queues")
Signed-off-by: Charles McLachlan <cmclachlan@solarflare.com>
Signed-off-by: Edward Cree <ecree@solarflare.com>
Signed-off-by: David S. Miller <davem@davemloft.net>