mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-09-06 02:50:43 +00:00
[NET]: Fix NAPI completion handling in some drivers.
In order for the list handling in net_rx_action() to be correct, drivers must follow certain rules as stated by this comment in net_rx_action(): /* Drivers must not modify the NAPI state if they * consume the entire weight. In such cases this code * still "owns" the NAPI instance and therefore can * move the instance around on the list at-will. */ A few drivers do not do this because they mix the budget checks with reading hardware state, resulting in crashes like the one reported by takano@axe-inc.co.jp. BNX2 and TG3 are taken care of here, SKY2 fix is from Stephen Hemminger. Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
parent
b08d6cb22c
commit
6f53576316
3 changed files with 82 additions and 42 deletions
|
@ -2633,15 +2633,11 @@ bnx2_has_work(struct bnx2 *bp)
|
|||
return 0;
|
||||
}
|
||||
|
||||
static int
|
||||
bnx2_poll(struct napi_struct *napi, int budget)
|
||||
static int bnx2_poll_work(struct bnx2 *bp, int work_done, int budget)
|
||||
{
|
||||
struct bnx2 *bp = container_of(napi, struct bnx2, napi);
|
||||
struct net_device *dev = bp->dev;
|
||||
struct status_block *sblk = bp->status_blk;
|
||||
u32 status_attn_bits = sblk->status_attn_bits;
|
||||
u32 status_attn_bits_ack = sblk->status_attn_bits_ack;
|
||||
int work_done = 0;
|
||||
|
||||
if ((status_attn_bits & STATUS_ATTN_EVENTS) !=
|
||||
(status_attn_bits_ack & STATUS_ATTN_EVENTS)) {
|
||||
|
@ -2660,13 +2656,27 @@ bnx2_poll(struct napi_struct *napi, int budget)
|
|||
bnx2_tx_int(bp);
|
||||
|
||||
if (bp->status_blk->status_rx_quick_consumer_index0 != bp->hw_rx_cons)
|
||||
work_done = bnx2_rx_int(bp, budget);
|
||||
work_done += bnx2_rx_int(bp, budget - work_done);
|
||||
|
||||
return work_done;
|
||||
}
|
||||
|
||||
static int bnx2_poll(struct napi_struct *napi, int budget)
|
||||
{
|
||||
struct bnx2 *bp = container_of(napi, struct bnx2, napi);
|
||||
int work_done = 0;
|
||||
|
||||
while (1) {
|
||||
work_done = bnx2_poll_work(bp, work_done, budget);
|
||||
|
||||
if (unlikely(work_done >= budget))
|
||||
break;
|
||||
|
||||
if (likely(!bnx2_has_work(bp))) {
|
||||
bp->last_status_idx = bp->status_blk->status_idx;
|
||||
rmb();
|
||||
|
||||
if (!bnx2_has_work(bp)) {
|
||||
netif_rx_complete(dev, napi);
|
||||
netif_rx_complete(bp->dev, napi);
|
||||
if (likely(bp->flags & USING_MSI_FLAG)) {
|
||||
REG_WR(bp, BNX2_PCICFG_INT_ACK_CMD,
|
||||
BNX2_PCICFG_INT_ACK_CMD_INDEX_VALID |
|
||||
|
@ -2681,6 +2691,8 @@ bnx2_poll(struct napi_struct *napi, int budget)
|
|||
REG_WR(bp, BNX2_PCICFG_INT_ACK_CMD,
|
||||
BNX2_PCICFG_INT_ACK_CMD_INDEX_VALID |
|
||||
bp->last_status_idx);
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
return work_done;
|
||||
|
|
|
@ -2606,7 +2606,7 @@ static int sky2_poll(struct napi_struct *napi, int work_limit)
|
|||
{
|
||||
struct sky2_hw *hw = container_of(napi, struct sky2_hw, napi);
|
||||
u32 status = sky2_read32(hw, B0_Y2_SP_EISR);
|
||||
int work_done;
|
||||
int work_done = 0;
|
||||
|
||||
if (unlikely(status & Y2_IS_ERROR))
|
||||
sky2_err_intr(hw, status);
|
||||
|
@ -2617,10 +2617,16 @@ static int sky2_poll(struct napi_struct *napi, int work_limit)
|
|||
if (status & Y2_IS_IRQ_PHY2)
|
||||
sky2_phy_intr(hw, 1);
|
||||
|
||||
work_done = sky2_status_intr(hw, work_limit);
|
||||
for(;;) {
|
||||
work_done += sky2_status_intr(hw, work_limit);
|
||||
|
||||
if (work_done >= work_limit)
|
||||
break;
|
||||
|
||||
/* More work? */
|
||||
if (hw->st_idx == sky2_read16(hw, STAT_PUT_IDX)) {
|
||||
if (hw->st_idx != sky2_read16(hw, STAT_PUT_IDX))
|
||||
continue;
|
||||
|
||||
/* Bug/Errata workaround?
|
||||
* Need to kick the TX irq moderation timer.
|
||||
*/
|
||||
|
@ -2631,7 +2637,10 @@ static int sky2_poll(struct napi_struct *napi, int work_limit)
|
|||
|
||||
napi_complete(napi);
|
||||
sky2_read32(hw, B0_Y2_SP_LISR);
|
||||
break;
|
||||
|
||||
}
|
||||
|
||||
return work_done;
|
||||
}
|
||||
|
||||
|
|
|
@ -3555,12 +3555,9 @@ static int tg3_rx(struct tg3 *tp, int budget)
|
|||
return received;
|
||||
}
|
||||
|
||||
static int tg3_poll(struct napi_struct *napi, int budget)
|
||||
static int tg3_poll_work(struct tg3 *tp, int work_done, int budget)
|
||||
{
|
||||
struct tg3 *tp = container_of(napi, struct tg3, napi);
|
||||
struct net_device *netdev = tp->dev;
|
||||
struct tg3_hw_status *sblk = tp->hw_status;
|
||||
int work_done = 0;
|
||||
|
||||
/* handle link change and other phy events */
|
||||
if (!(tp->tg3_flags &
|
||||
|
@ -3578,19 +3575,36 @@ static int tg3_poll(struct napi_struct *napi, int budget)
|
|||
/* run TX completion thread */
|
||||
if (sblk->idx[0].tx_consumer != tp->tx_cons) {
|
||||
tg3_tx(tp);
|
||||
if (unlikely(tp->tg3_flags & TG3_FLAG_TX_RECOVERY_PENDING)) {
|
||||
netif_rx_complete(netdev, napi);
|
||||
schedule_work(&tp->reset_task);
|
||||
if (unlikely(tp->tg3_flags & TG3_FLAG_TX_RECOVERY_PENDING))
|
||||
return 0;
|
||||
}
|
||||
}
|
||||
|
||||
/* run RX thread, within the bounds set by NAPI.
|
||||
* All RX "locking" is done by ensuring outside
|
||||
* code synchronizes with tg3->napi.poll()
|
||||
*/
|
||||
if (sblk->idx[0].rx_producer != tp->rx_rcb_ptr)
|
||||
work_done = tg3_rx(tp, budget);
|
||||
work_done += tg3_rx(tp, budget - work_done);
|
||||
|
||||
return work_done;
|
||||
}
|
||||
|
||||
static int tg3_poll(struct napi_struct *napi, int budget)
|
||||
{
|
||||
struct tg3 *tp = container_of(napi, struct tg3, napi);
|
||||
int work_done = 0;
|
||||
|
||||
while (1) {
|
||||
work_done = tg3_poll_work(tp, work_done, budget);
|
||||
|
||||
if (unlikely(tp->tg3_flags & TG3_FLAG_TX_RECOVERY_PENDING))
|
||||
goto tx_recovery;
|
||||
|
||||
if (unlikely(work_done >= budget))
|
||||
break;
|
||||
|
||||
if (likely(!tg3_has_work(tp))) {
|
||||
struct tg3_hw_status *sblk = tp->hw_status;
|
||||
|
||||
if (tp->tg3_flags & TG3_FLAG_TAGGED_STATUS) {
|
||||
tp->last_tag = sblk->status_tag;
|
||||
|
@ -3598,13 +3612,18 @@ static int tg3_poll(struct napi_struct *napi, int budget)
|
|||
} else
|
||||
sblk->status &= ~SD_STATUS_UPDATED;
|
||||
|
||||
/* if no more work, tell net stack and NIC we're done */
|
||||
if (!tg3_has_work(tp)) {
|
||||
netif_rx_complete(netdev, napi);
|
||||
netif_rx_complete(tp->dev, napi);
|
||||
tg3_restart_ints(tp);
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
return work_done;
|
||||
|
||||
tx_recovery:
|
||||
netif_rx_complete(tp->dev, napi);
|
||||
schedule_work(&tp->reset_task);
|
||||
return 0;
|
||||
}
|
||||
|
||||
static void tg3_irq_quiesce(struct tg3 *tp)
|
||||
|
|
Loading…
Reference in a new issue