forked from Minki/linux
amd-xgbe: Fix napi Rx budget accounting
Currently the amd-xgbe driver increments the packets processed counter each time a descriptor is processed. Since a packet can be represented by more than one descriptor incrementing the counter in this way is not appropriate. Also, since multiple descriptors cause the budget check to be short circuited, sometimes the returned value from the poll function would be larger than the budget value resulting in a WARN_ONCE being triggered. Update the polling logic to properly account for the number of packets processed and exit when the budget value is reached. Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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386f1c9650
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55ca6bcd73
@ -1598,7 +1598,8 @@ static int xgbe_rx_poll(struct xgbe_channel *channel, int budget)
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struct skb_shared_hwtstamps *hwtstamps;
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unsigned int incomplete, error, context_next, context;
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unsigned int len, put_len, max_len;
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int received = 0;
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unsigned int received = 0;
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int packet_count = 0;
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DBGPR("-->xgbe_rx_poll: budget=%d\n", budget);
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@ -1608,7 +1609,7 @@ static int xgbe_rx_poll(struct xgbe_channel *channel, int budget)
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rdata = XGBE_GET_DESC_DATA(ring, ring->cur);
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packet = &ring->packet_data;
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while (received < budget) {
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while (packet_count < budget) {
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DBGPR(" cur = %d\n", ring->cur);
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/* First time in loop see if we need to restore state */
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@ -1662,7 +1663,7 @@ read_again:
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if (packet->errors)
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DBGPR("Error in received packet\n");
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dev_kfree_skb(skb);
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continue;
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goto next_packet;
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}
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if (!context) {
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@ -1677,7 +1678,7 @@ read_again:
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}
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dev_kfree_skb(skb);
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continue;
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goto next_packet;
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}
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memcpy(skb_tail_pointer(skb), rdata->skb->data,
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put_len);
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@ -1694,7 +1695,7 @@ read_again:
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/* Stray Context Descriptor? */
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if (!skb)
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continue;
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goto next_packet;
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/* Be sure we don't exceed the configured MTU */
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max_len = netdev->mtu + ETH_HLEN;
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@ -1705,7 +1706,7 @@ read_again:
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if (skb->len > max_len) {
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DBGPR("packet length exceeds configured MTU\n");
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dev_kfree_skb(skb);
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continue;
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goto next_packet;
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}
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#ifdef XGMAC_ENABLE_RX_PKT_DUMP
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@ -1739,6 +1740,9 @@ read_again:
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netdev->last_rx = jiffies;
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napi_gro_receive(&pdata->napi, skb);
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next_packet:
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packet_count++;
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}
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/* Check if we need to save state before leaving */
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@ -1752,9 +1756,9 @@ read_again:
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rdata->state.error = error;
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}
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DBGPR("<--xgbe_rx_poll: received = %d\n", received);
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DBGPR("<--xgbe_rx_poll: packet_count = %d\n", packet_count);
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return received;
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return packet_count;
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}
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static int xgbe_poll(struct napi_struct *napi, int budget)
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