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i40e: Do not directly increment Tx next_to_use

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Avoid directly incrementing next_to_use for multiple reasons.  The main
reason being that if we directly increment it then it can attain a state
where it is equal to the ring count.  Technically this is a state it
should not be able to reach but the way this is written it now can.

This patch pulls the value off into a register and then increments it
and writes back either the value or 0 depending on if the value is equal
to the ring count.

Signed-off-by: Alexander Duyck <alexander.h.duyck@intel.com>
Signed-off-by: Jesse Brandeburg <jesse.brandeburg@intel.com>
Tested-by: Kavindya Deegala <kavindya.s.deegala@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
This commit is contained in:
Alexander Duyck 2013-09-28 06:00:22 +00:00 committed by Jeff Kirsher
parent 35a1e2ad17
commit fc4ac67bc9
1 changed files with 25 additions and 21 deletions
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46
drivers/net/ethernet/intel/i40e/i40e_txrx.c
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@ -73,11 +73,12 @@ int i40e_program_fdir_filter(struct i40e_fdir_data *fdir_data,
goto dma_fail;
/* grab the next descriptor */
fdir_desc = I40E_TX_FDIRDESC(tx_ring, tx_ring->next_to_use);
tx_buf = &tx_ring->tx_bi[tx_ring->next_to_use];
tx_ring->next_to_use++;
if (tx_ring->next_to_use == tx_ring->count)
tx_ring->next_to_use = 0;
i = tx_ring->next_to_use;
fdir_desc = I40E_TX_FDIRDESC(tx_ring, i);
tx_buf = &tx_ring->tx_bi[i];
i++;
tx_ring->next_to_use = (i < tx_ring->count) ? i : 0;
fdir_desc->qindex_flex_ptype_vsi = cpu_to_le32((fdir_data->q_index
<< I40E_TXD_FLTR_QW0_QINDEX_SHIFT)
@ -134,11 +135,11 @@ int i40e_program_fdir_filter(struct i40e_fdir_data *fdir_data,
fdir_desc->fd_id = cpu_to_le32(fdir_data->fd_id);
/* Now program a dummy descriptor */
tx_desc = I40E_TX_DESC(tx_ring, tx_ring->next_to_use);
tx_buf = &tx_ring->tx_bi[tx_ring->next_to_use];
tx_ring->next_to_use++;
if (tx_ring->next_to_use == tx_ring->count)
tx_ring->next_to_use = 0;
i = tx_ring->next_to_use;
tx_desc = I40E_TX_DESC(tx_ring, i);
i++;
tx_ring->next_to_use = (i < tx_ring->count) ? i : 0;
tx_desc->buffer_addr = cpu_to_le64(dma);
td_cmd = I40E_TX_DESC_CMD_EOP |
@ -148,9 +149,6 @@ int i40e_program_fdir_filter(struct i40e_fdir_data *fdir_data,
tx_desc->cmd_type_offset_bsz =
build_ctob(td_cmd, 0, I40E_FDIR_MAX_RAW_PACKET_LOOKUP, 0);
/* Mark the data descriptor to be watched */
tx_buf->next_to_watch = tx_desc;
/* Force memory writes to complete before letting h/w
* know there are new descriptors to fetch. (Only
* applicable for weak-ordered memory model archs,
@ -158,6 +156,9 @@ int i40e_program_fdir_filter(struct i40e_fdir_data *fdir_data,
*/
wmb();
/* Mark the data descriptor to be watched */
tx_buf->next_to_watch = tx_desc;
writel(tx_ring->next_to_use, tx_ring->tail);
return 0;
@ -1143,6 +1144,7 @@ static void i40e_atr(struct i40e_ring *tx_ring, struct sk_buff *skb,
struct tcphdr *th;
unsigned int hlen;
u32 flex_ptype, dtype_cmd;
u16 i;
/* make sure ATR is enabled */
if (!(pf->flags & I40E_FLAG_FDIR_ATR_ENABLED))
@ -1182,10 +1184,11 @@ static void i40e_atr(struct i40e_ring *tx_ring, struct sk_buff *skb,
tx_ring->atr_count = 0;
/* grab the next descriptor */
fdir_desc = I40E_TX_FDIRDESC(tx_ring, tx_ring->next_to_use);
tx_ring->next_to_use++;
if (tx_ring->next_to_use == tx_ring->count)
tx_ring->next_to_use = 0;
i = tx_ring->next_to_use;
fdir_desc = I40E_TX_FDIRDESC(tx_ring, i);
i++;
tx_ring->next_to_use = (i < tx_ring->count) ? i : 0;
flex_ptype = (tx_ring->queue_index << I40E_TXD_FLTR_QW0_QINDEX_SHIFT) &
I40E_TXD_FLTR_QW0_QINDEX_MASK;
@ -1481,15 +1484,16 @@ static void i40e_create_tx_ctx(struct i40e_ring *tx_ring,
const u32 cd_tunneling, const u32 cd_l2tag2)
{
struct i40e_tx_context_desc *context_desc;
int i = tx_ring->next_to_use;
if (!cd_type_cmd_tso_mss && !cd_tunneling && !cd_l2tag2)
return;
/* grab the next descriptor */
context_desc = I40E_TX_CTXTDESC(tx_ring, tx_ring->next_to_use);
tx_ring->next_to_use++;
if (tx_ring->next_to_use == tx_ring->count)
tx_ring->next_to_use = 0;
context_desc = I40E_TX_CTXTDESC(tx_ring, i);
i++;
tx_ring->next_to_use = (i < tx_ring->count) ? i : 0;
/* cpu_to_le32 and assign to struct fields */
context_desc->tunneling_params = cpu_to_le32(cd_tunneling);