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wifi: iwlwifi: use already mapped data when TXing an AMSDU

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The previous commits added mappings for the SKB and TSO page. This
switches the code to use these mappings instead of creating new ones.

Signed-off-by: Benjamin Berg <benjamin.berg@intel.com>
Signed-off-by: Miri Korenblit <miriam.rachel.korenblit@intel.com>
Reviewed-by: Johannes Berg <johannes.berg@intel.com>
Link: https://patch.msgid.link/20240703125541.35d89c5e4ae8.I4feb8d34e7b30768d21365ec22c944bacc274d0b@changeid
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Benjamin Berg 2024-07-03 12:58:55 +03:00 committed by Johannes Berg
parent adc902cead
commit 90db507552
2 changed files with 63 additions and 22 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

64
drivers/net/wireless/intel/iwlwifi/pcie/tx-gen2.c
View File

@ -61,7 +61,8 @@ static int iwl_txq_gen2_set_tb_with_wa(struct iwl_trans *trans,
struct sk_buff *skb,
struct iwl_tfh_tfd *tfd,
dma_addr_t phys, void *virt,
u16 len, struct iwl_cmd_meta *meta)
u16 len, struct iwl_cmd_meta *meta,
bool unmap)
{
dma_addr_t oldphys = phys;
struct page *page;
@ -105,10 +106,27 @@ static int iwl_txq_gen2_set_tb_with_wa(struct iwl_trans *trans,
memcpy(page_address(page), virt, len);
phys = dma_map_single(trans->dev, page_address(page), len,
DMA_TO_DEVICE);
if (unlikely(dma_mapping_error(trans->dev, phys)))
return -ENOMEM;
/*
* This is a bit odd, but performance does not matter here, what
* matters are the expectations of the calling code and TB cleanup
* function.
*
* As such, if unmap is set, then create another mapping for the TB
* entry as it will be unmapped later. On the other hand, if it is not
* set, then the TB entry will not be unmapped and instead we simply
* reference and sync the mapping that get_workaround_page() created.
*/
if (unmap) {
phys = dma_map_single(trans->dev, page_address(page), len,
DMA_TO_DEVICE);
if (unlikely(dma_mapping_error(trans->dev, phys)))
return -ENOMEM;
} else {
phys = iwl_pcie_get_tso_page_phys(page_address(page));
dma_sync_single_for_device(trans->dev, phys, len,
DMA_TO_DEVICE);
}
ret = iwl_txq_gen2_set_tb(trans, tfd, phys, len);
if (ret < 0) {
/* unmap the new allocation as single */
@ -116,6 +134,7 @@ static int iwl_txq_gen2_set_tb_with_wa(struct iwl_trans *trans,
meta = NULL;
goto unmap;
}
IWL_DEBUG_TX(trans,
"TB bug workaround: copied %d bytes from 0x%llx to 0x%llx\n",
len, (unsigned long long)oldphys,
@ -123,6 +142,9 @@ static int iwl_txq_gen2_set_tb_with_wa(struct iwl_trans *trans,
ret = 0;
unmap:
if (!unmap)
goto trace;
if (meta)
dma_unmap_page(trans->dev, oldphys, len, DMA_TO_DEVICE);
else
@ -146,6 +168,7 @@ static int iwl_txq_gen2_build_amsdu(struct iwl_trans *trans,
struct ieee80211_hdr *hdr = (void *)skb->data;
unsigned int snap_ip_tcp_hdrlen, ip_hdrlen, total_len, hdr_room;
unsigned int mss = skb_shinfo(skb)->gso_size;
dma_addr_t start_hdr_phys;
u16 length, amsdu_pad;
u8 *start_hdr;
struct sg_table *sgt;
@ -168,6 +191,8 @@ static int iwl_txq_gen2_build_amsdu(struct iwl_trans *trans,
if (!sgt)
return -ENOMEM;
start_hdr_phys = iwl_pcie_get_tso_page_phys(start_hdr);
/*
* Pull the ieee80211 header to be able to use TSO core,
* we will restore it for the tx_status flow.
@ -214,10 +239,8 @@ static int iwl_txq_gen2_build_amsdu(struct iwl_trans *trans,
pos_hdr += snap_ip_tcp_hdrlen;
tb_len = pos_hdr - start_hdr;
tb_phys = dma_map_single(trans->dev, start_hdr,
tb_len, DMA_TO_DEVICE);
if (unlikely(dma_mapping_error(trans->dev, tb_phys)))
goto out_err;
tb_phys = iwl_pcie_get_tso_page_phys(start_hdr);
/*
* No need for _with_wa, this is from the TSO page and
* we leave some space at the end of it so can't hit
@ -237,11 +260,14 @@ static int iwl_txq_gen2_build_amsdu(struct iwl_trans *trans,
int ret;
tb_len = min_t(unsigned int, tso.size, data_left);
tb_phys = dma_map_single(trans->dev, tso.data,
tb_len, DMA_TO_DEVICE);
tb_phys = iwl_pcie_get_sgt_tb_phys(sgt, tso.data);
/* Not a real mapping error, use direct comparison */
if (unlikely(tb_phys == DMA_MAPPING_ERROR))
goto out_err;
ret = iwl_txq_gen2_set_tb_with_wa(trans, skb, tfd,
tb_phys, tso.data,
tb_len, NULL);
tb_len, NULL, false);
if (ret)
goto out_err;
@ -250,6 +276,9 @@ static int iwl_txq_gen2_build_amsdu(struct iwl_trans *trans,
}
}
dma_sync_single_for_device(trans->dev, start_hdr_phys, hdr_room,
DMA_TO_DEVICE);
/* re -add the WiFi header */
skb_push(skb, hdr_len);
@ -339,7 +368,7 @@ static int iwl_txq_gen2_tx_add_frags(struct iwl_trans *trans,
fragsz, DMA_TO_DEVICE);
ret = iwl_txq_gen2_set_tb_with_wa(trans, skb, tfd, tb_phys,
skb_frag_address(frag),
fragsz, out_meta);
fragsz, out_meta, true);
if (ret)
return ret;
}
@ -413,7 +442,7 @@ iwl_tfh_tfd *iwl_txq_gen2_build_tx(struct iwl_trans *trans,
tb2_len, DMA_TO_DEVICE);
ret = iwl_txq_gen2_set_tb_with_wa(trans, skb, tfd, tb_phys,
skb->data + hdr_len, tb2_len,
NULL);
NULL, true);
if (ret)
goto out_err;
}
@ -428,7 +457,8 @@ iwl_tfh_tfd *iwl_txq_gen2_build_tx(struct iwl_trans *trans,
skb_headlen(frag), DMA_TO_DEVICE);
ret = iwl_txq_gen2_set_tb_with_wa(trans, skb, tfd, tb_phys,
frag->data,
skb_headlen(frag), NULL);
skb_headlen(frag), NULL,
true);
if (ret)
goto out_err;
if (iwl_txq_gen2_tx_add_frags(trans, frag, tfd, out_meta))
@ -623,6 +653,10 @@ void iwl_txq_gen2_tfd_unmap(struct iwl_trans *trans,
return;
}
/* TB1 is mapped directly, the rest is the TSO page and SG list. */
if (meta->sg_offset)
num_tbs = 2;
/* first TB is never freed - it's the bidirectional DMA data */
for (i = 1; i < num_tbs; i++) {
if (meta->tbs & BIT(i))

21
drivers/net/wireless/intel/iwlwifi/pcie/tx.c
View File

@ -303,6 +303,10 @@ static void iwl_txq_gen1_tfd_unmap(struct iwl_trans *trans,
return;
}
/* TB1 is mapped directly, the rest is the TSO page and SG list. */
if (meta->sg_offset)
num_tbs = 2;
/* first TB is never freed - it's the bidirectional DMA data */
for (i = 1; i < num_tbs; i++) {
@ -1892,6 +1896,7 @@ static int iwl_fill_data_tbs_amsdu(struct iwl_trans *trans, struct sk_buff *skb,
unsigned int snap_ip_tcp_hdrlen, ip_hdrlen, total_len, hdr_room;
unsigned int mss = skb_shinfo(skb)->gso_size;
u16 length, iv_len, amsdu_pad;
dma_addr_t start_hdr_phys;
u8 *start_hdr, *pos_hdr;
struct sg_table *sgt;
struct tso_t tso;
@ -1920,6 +1925,7 @@ static int iwl_fill_data_tbs_amsdu(struct iwl_trans *trans, struct sk_buff *skb,
if (!sgt)
return -ENOMEM;
start_hdr_phys = iwl_pcie_get_tso_page_phys(start_hdr);
pos_hdr = start_hdr;
memcpy(pos_hdr, skb->data + hdr_len, iv_len);
pos_hdr += iv_len;
@ -1971,10 +1977,8 @@ static int iwl_fill_data_tbs_amsdu(struct iwl_trans *trans, struct sk_buff *skb,
pos_hdr += snap_ip_tcp_hdrlen;
hdr_tb_len = pos_hdr - start_hdr;
hdr_tb_phys = dma_map_single(trans->dev, start_hdr,
hdr_tb_len, DMA_TO_DEVICE);
if (unlikely(dma_mapping_error(trans->dev, hdr_tb_phys)))
return -EINVAL;
hdr_tb_phys = iwl_pcie_get_tso_page_phys(start_hdr);
iwl_pcie_txq_build_tfd(trans, txq, hdr_tb_phys,
hdr_tb_len, false);
trace_iwlwifi_dev_tx_tb(trans->dev, skb, start_hdr,
@ -1991,9 +1995,9 @@ static int iwl_fill_data_tbs_amsdu(struct iwl_trans *trans, struct sk_buff *skb,
data_left);
dma_addr_t tb_phys;
tb_phys = dma_map_single(trans->dev, tso.data,
size, DMA_TO_DEVICE);
if (unlikely(dma_mapping_error(trans->dev, tb_phys)))
tb_phys = iwl_pcie_get_sgt_tb_phys(sgt, tso.data);
/* Not a real mapping error, use direct comparison */
if (unlikely(tb_phys == DMA_MAPPING_ERROR))
return -EINVAL;
iwl_pcie_txq_build_tfd(trans, txq, tb_phys,
@ -2006,6 +2010,9 @@ static int iwl_fill_data_tbs_amsdu(struct iwl_trans *trans, struct sk_buff *skb,
}
}
dma_sync_single_for_device(trans->dev, start_hdr_phys, hdr_room,
DMA_TO_DEVICE);
/* re -add the WiFi header and IV */
skb_push(skb, hdr_len + iv_len);