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iwlwifi: pcie: fix support for transmitting SKBs with fraglist

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When the implementation of SKBs with fraglist was sent upstream, a
merge-damage occurred and half the patch was not applied.

This causes problems in high-throughput situations with AX200 devices,
including low throughput and FW crashes.

Introduce the part that was missing from the original patch.

Fixes: 0044f1716c ("iwlwifi: pcie: support transmitting SKBs with fraglist")
Cc: stable@vger.kernel.org # 4.20+
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
[ This patch was created by me, but the original author of this code
  is Johannes, so his s-o-b is here and he's marked as the author of
  the patch. ]
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
This commit is contained in:
Johannes Berg
2018-06-01 10:32:55 +02:00
committed by Luca Coelho
parent eac08515d7
commit 4f4925a7b2
1 changed files with 14 additions and 0 deletions
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14
drivers/net/wireless/intel/iwlwifi/pcie/tx-gen2.c
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@@ -468,6 +468,7 @@ iwl_tfh_tfd *iwl_pcie_gen2_build_tx(struct iwl_trans *trans,
dma_addr_t tb_phys;
int len, tb1_len, tb2_len;
void *tb1_addr;
struct sk_buff *frag;
tb_phys = iwl_pcie_get_first_tb_dma(txq, idx);
@@ -516,6 +517,19 @@ iwl_tfh_tfd *iwl_pcie_gen2_build_tx(struct iwl_trans *trans,
if (iwl_pcie_gen2_tx_add_frags(trans, skb, tfd, out_meta))
goto out_err;
skb_walk_frags(skb, frag) {
tb_phys = dma_map_single(trans->dev, frag->data,
skb_headlen(frag), DMA_TO_DEVICE);
if (unlikely(dma_mapping_error(trans->dev, tb_phys)))
goto out_err;
iwl_pcie_gen2_set_tb(trans, tfd, tb_phys, skb_headlen(frag));
trace_iwlwifi_dev_tx_tb(trans->dev, skb,
frag->data,
skb_headlen(frag));
if (iwl_pcie_gen2_tx_add_frags(trans, frag, tfd, out_meta))
goto out_err;
}
return tfd;
out_err: