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i40e: introduce next_to_process to i40e_ring

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Add a new field called next_to_process in the i40e_ring that is
advanced for every buffer and change the semantics of next_to_clean to
point to the first buffer of a packet. Driver will use next_to_process
in the same way next_to_clean was used previously.

For the non multi-buffer case, next_to_process and next_to_clean will
always be the same since each packet consists of a single buffer.

Signed-off-by: Tirthendu Sarkar <tirthendu.sarkar@intel.com>
Tested-by: Chandan Kumar Rout <chandanx.rout@intel.com> (A Contingent Worker at Intel)
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>
This commit is contained in:
Tirthendu Sarkar 2023-03-10 00:26:13 +05:30 committed by Tony Nguyen
parent 2bc0de9aca
commit e9031f2da1
2 changed files with 19 additions and 11 deletions
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26
drivers/net/ethernet/intel/i40e/i40e_txrx.c
View File

@ -1524,6 +1524,7 @@ skip_free:
rx_ring->next_to_alloc = 0;
rx_ring->next_to_clean = 0;
rx_ring->next_to_process = 0;
rx_ring->next_to_use = 0;
}
@ -1576,6 +1577,7 @@ int i40e_setup_rx_descriptors(struct i40e_ring *rx_ring)
rx_ring->next_to_alloc = 0;
rx_ring->next_to_clean = 0;
rx_ring->next_to_process = 0;
rx_ring->next_to_use = 0;
/* XDP RX-queue info only needed for RX rings exposed to XDP */
@ -2076,7 +2078,7 @@ static struct i40e_rx_buffer *i40e_get_rx_buffer(struct i40e_ring *rx_ring,
{
struct i40e_rx_buffer *rx_buffer;
rx_buffer = i40e_rx_bi(rx_ring, rx_ring->next_to_clean);
rx_buffer = i40e_rx_bi(rx_ring, rx_ring->next_to_process);
rx_buffer->page_count =
#if (PAGE_SIZE < 8192)
page_count(rx_buffer->page);
@ -2375,16 +2377,16 @@ void i40e_finalize_xdp_rx(struct i40e_ring *rx_ring, unsigned int xdp_res)
}
/**
* i40e_inc_ntc: Advance the next_to_clean index
* i40e_inc_ntp: Advance the next_to_process index
* @rx_ring: Rx ring
**/
static void i40e_inc_ntc(struct i40e_ring *rx_ring)
static void i40e_inc_ntp(struct i40e_ring *rx_ring)
{
u32 ntc = rx_ring->next_to_clean + 1;
u32 ntp = rx_ring->next_to_process + 1;
ntc = (ntc < rx_ring->count) ? ntc : 0;
rx_ring->next_to_clean = ntc;
prefetch(I40E_RX_DESC(rx_ring, ntc));
ntp = (ntp < rx_ring->count) ? ntp : 0;
rx_ring->next_to_process = ntp;
prefetch(I40E_RX_DESC(rx_ring, ntp));
}
/**
@ -2421,6 +2423,7 @@ static int i40e_clean_rx_irq(struct i40e_ring *rx_ring, int budget,
xdp_prog = READ_ONCE(rx_ring->xdp_prog);
while (likely(total_rx_packets < (unsigned int)budget)) {
u16 ntp = rx_ring->next_to_process;
struct i40e_rx_buffer *rx_buffer;
union i40e_rx_desc *rx_desc;
unsigned int size;
@ -2433,7 +2436,7 @@ static int i40e_clean_rx_irq(struct i40e_ring *rx_ring, int budget,
cleaned_count = 0;
}
rx_desc = I40E_RX_DESC(rx_ring, rx_ring->next_to_clean);
rx_desc = I40E_RX_DESC(rx_ring, ntp);
/* status_error_len will always be zero for unused descriptors
* because it's cleared in cleanup, and overlaps with hdr_addr
@ -2452,8 +2455,8 @@ static int i40e_clean_rx_irq(struct i40e_ring *rx_ring, int budget,
i40e_clean_programming_status(rx_ring,
rx_desc->raw.qword[0],
qword);
rx_buffer = i40e_rx_bi(rx_ring, rx_ring->next_to_clean);
i40e_inc_ntc(rx_ring);
rx_buffer = i40e_rx_bi(rx_ring, ntp);
i40e_inc_ntp(rx_ring);
i40e_reuse_rx_page(rx_ring, rx_buffer);
cleaned_count++;
continue;
@ -2509,7 +2512,8 @@ static int i40e_clean_rx_irq(struct i40e_ring *rx_ring, int budget,
i40e_put_rx_buffer(rx_ring, rx_buffer);
cleaned_count++;
i40e_inc_ntc(rx_ring);
i40e_inc_ntp(rx_ring);
rx_ring->next_to_clean = rx_ring->next_to_process;
if (i40e_is_non_eop(rx_ring, rx_desc))
continue;

4
drivers/net/ethernet/intel/i40e/i40e_txrx.h
View File

@ -337,6 +337,10 @@ struct i40e_ring {
u8 dcb_tc; /* Traffic class of ring */
u8 __iomem *tail;
/* Next descriptor to be processed; next_to_clean is updated only on
* processing EOP descriptor
*/
u16 next_to_process;
/* high bit set means dynamic, use accessor routines to read/write.
* hardware only supports 2us resolution for the ITR registers.
* these values always store the USER setting, and must be converted