From 91a65b7d3ed8450f31ab717a65dcb5f9ceb5ab02 Mon Sep 17 00:00:00 2001 From: Arthur Kiyanovski Date: Tue, 11 Feb 2020 15:17:40 +0000 Subject: [PATCH 01/12] net: ena: fix potential crash when rxfh key is NULL When ethtool -X is called without an hkey, ena_com_fill_hash_function() is called with key=NULL, which is passed to memcpy causing a crash. This commit fixes this issue by checking key is not NULL. Fixes: 1738cd3ed342 ("net: ena: Add a driver for Amazon Elastic Network Adapters (ENA)") Signed-off-by: Sameeh Jubran Signed-off-by: Arthur Kiyanovski Signed-off-by: David S. Miller --- drivers/net/ethernet/amazon/ena/ena_com.c | 17 +++++++++-------- 1 file changed, 9 insertions(+), 8 deletions(-) diff --git a/drivers/net/ethernet/amazon/ena/ena_com.c b/drivers/net/ethernet/amazon/ena/ena_com.c index ea62604fdf8c..e54c44fdcaa7 100644 --- a/drivers/net/ethernet/amazon/ena/ena_com.c +++ b/drivers/net/ethernet/amazon/ena/ena_com.c @@ -2297,15 +2297,16 @@ int ena_com_fill_hash_function(struct ena_com_dev *ena_dev, switch (func) { case ENA_ADMIN_TOEPLITZ: - if (key_len > sizeof(hash_key->key)) { - pr_err("key len (%hu) is bigger than the max supported (%zu)\n", - key_len, sizeof(hash_key->key)); - return -EINVAL; + if (key) { + if (key_len != sizeof(hash_key->key)) { + pr_err("key len (%hu) doesn't equal the supported size (%zu)\n", + key_len, sizeof(hash_key->key)); + return -EINVAL; + } + memcpy(hash_key->key, key, key_len); + rss->hash_init_val = init_val; + hash_key->keys_num = key_len >> 2; } - - memcpy(hash_key->key, key, key_len); - rss->hash_init_val = init_val; - hash_key->keys_num = key_len >> 2; break; case ENA_ADMIN_CRC32: rss->hash_init_val = init_val; From 2a6e5fa2f4c25b66c763428a3e65363214946931 Mon Sep 17 00:00:00 2001 From: Arthur Kiyanovski Date: Tue, 11 Feb 2020 15:17:41 +0000 Subject: [PATCH 02/12] net: ena: fix uses of round_jiffies() >From the documentation of round_jiffies(): "Rounds a time delta in the future (in jiffies) up or down to (approximately) full seconds. This is useful for timers for which the exact time they fire does not matter too much, as long as they fire approximately every X seconds. By rounding these timers to whole seconds, all such timers will fire at the same time, rather than at various times spread out. The goal of this is to have the CPU wake up less, which saves power." There are 2 parts to this patch: ================================ Part 1: ------- In our case we need timer_service to be called approximately every X=1 seconds, and the exact time does not matter, so using round_jiffies() is the right way to go. Therefore we add round_jiffies() to the mod_timer() in ena_timer_service(). Part 2: ------- round_jiffies() is used in check_for_missing_keep_alive() when getting the jiffies of the expiration of the keep_alive timeout. Here it is actually a mistake to use round_jiffies() because we want the exact time when keep_alive should expire and not an approximate rounded time, which can cause early, false positive, timeouts. Therefore we remove round_jiffies() in the calculation of keep_alive_expired() in check_for_missing_keep_alive(). Fixes: 82ef30f13be0 ("net: ena: add hardware hints capability to the driver") Fixes: 1738cd3ed342 ("net: ena: Add a driver for Amazon Elastic Network Adapters (ENA)") Signed-off-by: Arthur Kiyanovski Signed-off-by: David S. Miller --- drivers/net/ethernet/amazon/ena/ena_netdev.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/drivers/net/ethernet/amazon/ena/ena_netdev.c b/drivers/net/ethernet/amazon/ena/ena_netdev.c index 894e8c1a8cf1..0b2fd96b93d7 100644 --- a/drivers/net/ethernet/amazon/ena/ena_netdev.c +++ b/drivers/net/ethernet/amazon/ena/ena_netdev.c @@ -3706,8 +3706,8 @@ static void check_for_missing_keep_alive(struct ena_adapter *adapter) if (adapter->keep_alive_timeout == ENA_HW_HINTS_NO_TIMEOUT) return; - keep_alive_expired = round_jiffies(adapter->last_keep_alive_jiffies + - adapter->keep_alive_timeout); + keep_alive_expired = adapter->last_keep_alive_jiffies + + adapter->keep_alive_timeout; if (unlikely(time_is_before_jiffies(keep_alive_expired))) { netif_err(adapter, drv, adapter->netdev, "Keep alive watchdog timeout.\n"); @@ -3809,7 +3809,7 @@ static void ena_timer_service(struct timer_list *t) } /* Reset the timer */ - mod_timer(&adapter->timer_service, jiffies + HZ); + mod_timer(&adapter->timer_service, round_jiffies(jiffies + HZ)); } static int ena_calc_max_io_queue_num(struct pci_dev *pdev, From cf6d17fde93bdda23c9b02dd5906a12bf8c55209 Mon Sep 17 00:00:00 2001 From: Arthur Kiyanovski Date: Tue, 11 Feb 2020 15:17:42 +0000 Subject: [PATCH 03/12] net: ena: add missing ethtool TX timestamping indication Current implementation of the driver calls skb_tx_timestamp()to add a software tx timestamp to the skb, however the software-transmit capability is not reported in ethtool -T. This commit updates the ethtool structure to report the software-transmit capability in ethtool -T using the standard ethtool_op_get_ts_info(). This function reports all software timestamping capabilities (tx and rx), as well as setting phc_index = -1. phc_index is the index of the PTP hardware clock device that will be used for hardware timestamps. Since we don't have such a device in ENA, using the default -1 value is the correct setting. Fixes: 1738cd3ed342 ("net: ena: Add a driver for Amazon Elastic Network Adapters (ENA)") Signed-off-by: Ezequiel Lara Gomez Signed-off-by: Arthur Kiyanovski Signed-off-by: David S. Miller --- drivers/net/ethernet/amazon/ena/ena_ethtool.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/net/ethernet/amazon/ena/ena_ethtool.c b/drivers/net/ethernet/amazon/ena/ena_ethtool.c index b4e891d49a94..08273eb226ee 100644 --- a/drivers/net/ethernet/amazon/ena/ena_ethtool.c +++ b/drivers/net/ethernet/amazon/ena/ena_ethtool.c @@ -814,6 +814,7 @@ static const struct ethtool_ops ena_ethtool_ops = { .set_channels = ena_set_channels, .get_tunable = ena_get_tunable, .set_tunable = ena_set_tunable, + .get_ts_info = ethtool_op_get_ts_info, }; void ena_set_ethtool_ops(struct net_device *netdev) From 0d1c3de7b8c78a5e44b74b62ede4a63629f5d811 Mon Sep 17 00:00:00 2001 From: Arthur Kiyanovski Date: Tue, 11 Feb 2020 15:17:43 +0000 Subject: [PATCH 04/12] net: ena: fix incorrect default RSS key Bug description: When running "ethtool -x " the key shows up as all zeros. When we use "ethtool -X hfunc toeplitz hkey " to set the key and then try to retrieve it using "ethtool -x " then we return the correct key because we return the one we saved. Bug cause: We don't fetch the key from the device but instead return the key that we have saved internally which is by default set to zero upon allocation. Fix: This commit fixes the issue by initializing the key to a random value using netdev_rss_key_fill(). Fixes: 1738cd3ed342 ("net: ena: Add a driver for Amazon Elastic Network Adapters (ENA)") Signed-off-by: Sameeh Jubran Signed-off-by: Arthur Kiyanovski Signed-off-by: David S. Miller --- drivers/net/ethernet/amazon/ena/ena_com.c | 15 +++++++++++++++ drivers/net/ethernet/amazon/ena/ena_com.h | 1 + 2 files changed, 16 insertions(+) diff --git a/drivers/net/ethernet/amazon/ena/ena_com.c b/drivers/net/ethernet/amazon/ena/ena_com.c index e54c44fdcaa7..d6b894b06fa3 100644 --- a/drivers/net/ethernet/amazon/ena/ena_com.c +++ b/drivers/net/ethernet/amazon/ena/ena_com.c @@ -1041,6 +1041,19 @@ static int ena_com_get_feature(struct ena_com_dev *ena_dev, feature_ver); } +static void ena_com_hash_key_fill_default_key(struct ena_com_dev *ena_dev) +{ + struct ena_admin_feature_rss_flow_hash_control *hash_key = + (ena_dev->rss).hash_key; + + netdev_rss_key_fill(&hash_key->key, sizeof(hash_key->key)); + /* The key is stored in the device in u32 array + * as well as the API requires the key to be passed in this + * format. Thus the size of our array should be divided by 4 + */ + hash_key->keys_num = sizeof(hash_key->key) / sizeof(u32); +} + static int ena_com_hash_key_allocate(struct ena_com_dev *ena_dev) { struct ena_rss *rss = &ena_dev->rss; @@ -2631,6 +2644,8 @@ int ena_com_rss_init(struct ena_com_dev *ena_dev, u16 indr_tbl_log_size) if (unlikely(rc)) goto err_hash_key; + ena_com_hash_key_fill_default_key(ena_dev); + rc = ena_com_hash_ctrl_init(ena_dev); if (unlikely(rc)) goto err_hash_ctrl; diff --git a/drivers/net/ethernet/amazon/ena/ena_com.h b/drivers/net/ethernet/amazon/ena/ena_com.h index 0ce37d54ed10..9b5bd28ed0ac 100644 --- a/drivers/net/ethernet/amazon/ena/ena_com.h +++ b/drivers/net/ethernet/amazon/ena/ena_com.h @@ -44,6 +44,7 @@ #include #include #include +#include #include "ena_common_defs.h" #include "ena_admin_defs.h" From 6a4f7dc82d1e3abd3feb0c60b5041056fcd9880c Mon Sep 17 00:00:00 2001 From: Sameeh Jubran Date: Tue, 11 Feb 2020 15:17:44 +0000 Subject: [PATCH 05/12] net: ena: rss: do not allocate key when not supported Currently we allocate the key whether the device supports setting the key or not. This commit adds a check to the allocation function and handles the error accordingly. Fixes: 1738cd3ed342 ("net: ena: Add a driver for Amazon Elastic Network Adapters (ENA)") Signed-off-by: Sameeh Jubran Signed-off-by: David S. Miller --- drivers/net/ethernet/amazon/ena/ena_com.c | 24 ++++++++++++++++++++--- 1 file changed, 21 insertions(+), 3 deletions(-) diff --git a/drivers/net/ethernet/amazon/ena/ena_com.c b/drivers/net/ethernet/amazon/ena/ena_com.c index d6b894b06fa3..6f758ece86f6 100644 --- a/drivers/net/ethernet/amazon/ena/ena_com.c +++ b/drivers/net/ethernet/amazon/ena/ena_com.c @@ -1057,6 +1057,20 @@ static void ena_com_hash_key_fill_default_key(struct ena_com_dev *ena_dev) static int ena_com_hash_key_allocate(struct ena_com_dev *ena_dev) { struct ena_rss *rss = &ena_dev->rss; + struct ena_admin_feature_rss_flow_hash_control *hash_key; + struct ena_admin_get_feat_resp get_resp; + int rc; + + hash_key = (ena_dev->rss).hash_key; + + rc = ena_com_get_feature_ex(ena_dev, &get_resp, + ENA_ADMIN_RSS_HASH_FUNCTION, + ena_dev->rss.hash_key_dma_addr, + sizeof(ena_dev->rss.hash_key), 0); + if (unlikely(rc)) { + hash_key = NULL; + return -EOPNOTSUPP; + } rss->hash_key = dma_alloc_coherent(ena_dev->dmadev, sizeof(*rss->hash_key), @@ -2640,11 +2654,15 @@ int ena_com_rss_init(struct ena_com_dev *ena_dev, u16 indr_tbl_log_size) if (unlikely(rc)) goto err_indr_tbl; + /* The following function might return unsupported in case the + * device doesn't support setting the key / hash function. We can safely + * ignore this error and have indirection table support only. + */ rc = ena_com_hash_key_allocate(ena_dev); - if (unlikely(rc)) + if (unlikely(rc) && rc != -EOPNOTSUPP) goto err_hash_key; - - ena_com_hash_key_fill_default_key(ena_dev); + else if (rc != -EOPNOTSUPP) + ena_com_hash_key_fill_default_key(ena_dev); rc = ena_com_hash_ctrl_init(ena_dev); if (unlikely(rc)) From 0c8923c0a64fb5d14bebb9a9065d2dc25ac5e600 Mon Sep 17 00:00:00 2001 From: Sameeh Jubran Date: Tue, 11 Feb 2020 15:17:45 +0000 Subject: [PATCH 06/12] net: ena: rss: fix failure to get indirection table On old hardware, getting / setting the hash function is not supported while gettting / setting the indirection table is. This commit enables us to still show the indirection table on older hardwares by setting the hash function and key to NULL. Fixes: 1738cd3ed342 ("net: ena: Add a driver for Amazon Elastic Network Adapters (ENA)") Signed-off-by: Sameeh Jubran Signed-off-by: David S. Miller --- drivers/net/ethernet/amazon/ena/ena_ethtool.c | 14 ++++++++++++++ 1 file changed, 14 insertions(+) diff --git a/drivers/net/ethernet/amazon/ena/ena_ethtool.c b/drivers/net/ethernet/amazon/ena/ena_ethtool.c index 08273eb226ee..d44ae4fc9c4e 100644 --- a/drivers/net/ethernet/amazon/ena/ena_ethtool.c +++ b/drivers/net/ethernet/amazon/ena/ena_ethtool.c @@ -648,7 +648,21 @@ static int ena_get_rxfh(struct net_device *netdev, u32 *indir, u8 *key, if (rc) return rc; + /* We call this function in order to check if the device + * supports getting/setting the hash function. + */ rc = ena_com_get_hash_function(adapter->ena_dev, &ena_func, key); + + if (rc) { + if (rc == -EOPNOTSUPP) { + key = NULL; + hfunc = NULL; + rc = 0; + } + + return rc; + } + if (rc) return rc; From 4844470d472d660c26149ad764da2406adb13423 Mon Sep 17 00:00:00 2001 From: Arthur Kiyanovski Date: Tue, 11 Feb 2020 15:17:46 +0000 Subject: [PATCH 07/12] net: ena: rss: store hash function as values and not bits The device receives, stores and retrieves the hash function value as bits and not as their enum value. The bug: * In ena_com_set_hash_function() we set cmd.u.flow_hash_func.selected_func to the bit value of rss->hash_func. (1 << rss->hash_func) * In ena_com_get_hash_function() we retrieve the hash function and store it's bit value in rss->hash_func. (Now the bit value of rss->hash_func is stored in rss->hash_func instead of it's enum value) The fix: This commit fixes the issue by converting the retrieved hash function values from the device to the matching enum value of the set bit using ffs(). ffs() finds the first set bit's index in a word. Since the function returns 1 for the LSB's index, we need to subtract 1 from the returned value (note that BIT(0) is 1). Fixes: 1738cd3ed342 ("net: ena: Add a driver for Amazon Elastic Network Adapters (ENA)") Signed-off-by: Sameeh Jubran Signed-off-by: Arthur Kiyanovski Signed-off-by: David S. Miller --- drivers/net/ethernet/amazon/ena/ena_com.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/drivers/net/ethernet/amazon/ena/ena_com.c b/drivers/net/ethernet/amazon/ena/ena_com.c index 6f758ece86f6..8ab192cb26b7 100644 --- a/drivers/net/ethernet/amazon/ena/ena_com.c +++ b/drivers/net/ethernet/amazon/ena/ena_com.c @@ -2370,7 +2370,11 @@ int ena_com_get_hash_function(struct ena_com_dev *ena_dev, if (unlikely(rc)) return rc; - rss->hash_func = get_resp.u.flow_hash_func.selected_func; + /* ffs() returns 1 in case the lsb is set */ + rss->hash_func = ffs(get_resp.u.flow_hash_func.selected_func); + if (rss->hash_func) + rss->hash_func--; + if (func) *func = rss->hash_func; From 92569fd27f5cb0ccbdf7c7d70044b690e89a0277 Mon Sep 17 00:00:00 2001 From: Arthur Kiyanovski Date: Tue, 11 Feb 2020 15:17:47 +0000 Subject: [PATCH 08/12] net: ena: fix incorrectly saving queue numbers when setting RSS indirection table The indirection table has the indices of the Rx queues. When we store it during set indirection operation, we convert the indices to our internal representation of the indices. Our internal representation of the indices is: even indices for Tx and uneven indices for Rx, where every Tx/Rx pair are in a consecutive order starting from 0. For example if the driver has 3 queues (3 for Tx and 3 for Rx) then the indices are as follows: 0 1 2 3 4 5 Tx Rx Tx Rx Tx Rx The BUG: The issue is that when we satisfy a get request for the indirection table, we don't convert the indices back to the original representation. The FIX: Simply apply the inverse function for the indices of the indirection table after we set it. Fixes: 1738cd3ed342 ("net: ena: Add a driver for Amazon Elastic Network Adapters (ENA)") Signed-off-by: Sameeh Jubran Signed-off-by: Arthur Kiyanovski Signed-off-by: David S. Miller --- drivers/net/ethernet/amazon/ena/ena_ethtool.c | 24 ++++++++++++++++++- drivers/net/ethernet/amazon/ena/ena_netdev.h | 2 ++ 2 files changed, 25 insertions(+), 1 deletion(-) diff --git a/drivers/net/ethernet/amazon/ena/ena_ethtool.c b/drivers/net/ethernet/amazon/ena/ena_ethtool.c index d44ae4fc9c4e..9a7a6ef39f9a 100644 --- a/drivers/net/ethernet/amazon/ena/ena_ethtool.c +++ b/drivers/net/ethernet/amazon/ena/ena_ethtool.c @@ -636,6 +636,28 @@ static u32 ena_get_rxfh_key_size(struct net_device *netdev) return ENA_HASH_KEY_SIZE; } +static int ena_indirection_table_get(struct ena_adapter *adapter, u32 *indir) +{ + struct ena_com_dev *ena_dev = adapter->ena_dev; + int i, rc; + + if (!indir) + return 0; + + rc = ena_com_indirect_table_get(ena_dev, indir); + if (rc) + return rc; + + /* Our internal representation of the indices is: even indices + * for Tx and uneven indices for Rx. We need to convert the Rx + * indices to be consecutive + */ + for (i = 0; i < ENA_RX_RSS_TABLE_SIZE; i++) + indir[i] = ENA_IO_RXQ_IDX_TO_COMBINED_IDX(indir[i]); + + return rc; +} + static int ena_get_rxfh(struct net_device *netdev, u32 *indir, u8 *key, u8 *hfunc) { @@ -644,7 +666,7 @@ static int ena_get_rxfh(struct net_device *netdev, u32 *indir, u8 *key, u8 func; int rc; - rc = ena_com_indirect_table_get(adapter->ena_dev, indir); + rc = ena_indirection_table_get(adapter, indir); if (rc) return rc; diff --git a/drivers/net/ethernet/amazon/ena/ena_netdev.h b/drivers/net/ethernet/amazon/ena/ena_netdev.h index 094324fd0edc..8795e0b1dc3c 100644 --- a/drivers/net/ethernet/amazon/ena/ena_netdev.h +++ b/drivers/net/ethernet/amazon/ena/ena_netdev.h @@ -130,6 +130,8 @@ #define ENA_IO_TXQ_IDX(q) (2 * (q)) #define ENA_IO_RXQ_IDX(q) (2 * (q) + 1) +#define ENA_IO_TXQ_IDX_TO_COMBINED_IDX(q) ((q) / 2) +#define ENA_IO_RXQ_IDX_TO_COMBINED_IDX(q) (((q) - 1) / 2) #define ENA_MGMNT_IRQ_IDX 0 #define ENA_IO_IRQ_FIRST_IDX 1 From e3f89f91e98ce07dc0f121a3b70d21aca749ba39 Mon Sep 17 00:00:00 2001 From: Arthur Kiyanovski Date: Tue, 11 Feb 2020 15:17:48 +0000 Subject: [PATCH 09/12] net: ena: fix corruption of dev_idx_to_host_tbl The function ena_com_ind_tbl_convert_from_device() has an overflow bug as explained below. Either way, this function is not needed at all since we don't retrieve the indirection table from the device at any point which means that this conversion is not needed. The bug: The for loop iterates over all io_sq_queues, when passing the actual number of used queues the io_sq_queues[i].idx equals 0 since they are uninitialized which results in the following code to be executed till the end of the loop: dev_idx_to_host_tbl[0] = i; This results dev_idx_to_host_tbl[0] in being equal to ENA_TOTAL_NUM_QUEUES - 1. Fixes: 1738cd3ed342 ("net: ena: Add a driver for Amazon Elastic Network Adapters (ENA)") Signed-off-by: Sameeh Jubran Signed-off-by: Arthur Kiyanovski Signed-off-by: David S. Miller --- drivers/net/ethernet/amazon/ena/ena_com.c | 28 ----------------------- 1 file changed, 28 deletions(-) diff --git a/drivers/net/ethernet/amazon/ena/ena_com.c b/drivers/net/ethernet/amazon/ena/ena_com.c index 8ab192cb26b7..74743fd8a1e0 100644 --- a/drivers/net/ethernet/amazon/ena/ena_com.c +++ b/drivers/net/ethernet/amazon/ena/ena_com.c @@ -1281,30 +1281,6 @@ static int ena_com_ind_tbl_convert_to_device(struct ena_com_dev *ena_dev) return 0; } -static int ena_com_ind_tbl_convert_from_device(struct ena_com_dev *ena_dev) -{ - u16 dev_idx_to_host_tbl[ENA_TOTAL_NUM_QUEUES] = { (u16)-1 }; - struct ena_rss *rss = &ena_dev->rss; - u8 idx; - u16 i; - - for (i = 0; i < ENA_TOTAL_NUM_QUEUES; i++) - dev_idx_to_host_tbl[ena_dev->io_sq_queues[i].idx] = i; - - for (i = 0; i < 1 << rss->tbl_log_size; i++) { - if (rss->rss_ind_tbl[i].cq_idx > ENA_TOTAL_NUM_QUEUES) - return -EINVAL; - idx = (u8)rss->rss_ind_tbl[i].cq_idx; - - if (dev_idx_to_host_tbl[idx] > ENA_TOTAL_NUM_QUEUES) - return -EINVAL; - - rss->host_rss_ind_tbl[i] = dev_idx_to_host_tbl[idx]; - } - - return 0; -} - static void ena_com_update_intr_delay_resolution(struct ena_com_dev *ena_dev, u16 intr_delay_resolution) { @@ -2638,10 +2614,6 @@ int ena_com_indirect_table_get(struct ena_com_dev *ena_dev, u32 *ind_tbl) if (!ind_tbl) return 0; - rc = ena_com_ind_tbl_convert_from_device(ena_dev); - if (unlikely(rc)) - return rc; - for (i = 0; i < (1 << rss->tbl_log_size); i++) ind_tbl[i] = rss->host_rss_ind_tbl[i]; From 470793a78ce344bd53d31e0c2d537f71ba957547 Mon Sep 17 00:00:00 2001 From: Arthur Kiyanovski Date: Tue, 11 Feb 2020 15:17:49 +0000 Subject: [PATCH 10/12] net: ena: make ena rxfh support ETH_RSS_HASH_NO_CHANGE As the name suggests ETH_RSS_HASH_NO_CHANGE is received upon changing the key or indirection table using ethtool while keeping the same hash function. Also add a function for retrieving the current hash function from the ena-com layer. Fixes: 1738cd3ed342 ("net: ena: Add a driver for Amazon Elastic Network Adapters (ENA)") Signed-off-by: Sameeh Jubran Signed-off-by: Saeed Bshara Signed-off-by: Arthur Kiyanovski Signed-off-by: David S. Miller --- drivers/net/ethernet/amazon/ena/ena_com.c | 5 +++++ drivers/net/ethernet/amazon/ena/ena_com.h | 8 ++++++++ drivers/net/ethernet/amazon/ena/ena_ethtool.c | 3 +++ 3 files changed, 16 insertions(+) diff --git a/drivers/net/ethernet/amazon/ena/ena_com.c b/drivers/net/ethernet/amazon/ena/ena_com.c index 74743fd8a1e0..0f93d1092435 100644 --- a/drivers/net/ethernet/amazon/ena/ena_com.c +++ b/drivers/net/ethernet/amazon/ena/ena_com.c @@ -1041,6 +1041,11 @@ static int ena_com_get_feature(struct ena_com_dev *ena_dev, feature_ver); } +int ena_com_get_current_hash_function(struct ena_com_dev *ena_dev) +{ + return ena_dev->rss.hash_func; +} + static void ena_com_hash_key_fill_default_key(struct ena_com_dev *ena_dev) { struct ena_admin_feature_rss_flow_hash_control *hash_key = diff --git a/drivers/net/ethernet/amazon/ena/ena_com.h b/drivers/net/ethernet/amazon/ena/ena_com.h index 9b5bd28ed0ac..469f298199a7 100644 --- a/drivers/net/ethernet/amazon/ena/ena_com.h +++ b/drivers/net/ethernet/amazon/ena/ena_com.h @@ -656,6 +656,14 @@ int ena_com_rss_init(struct ena_com_dev *ena_dev, u16 log_size); */ void ena_com_rss_destroy(struct ena_com_dev *ena_dev); +/* ena_com_get_current_hash_function - Get RSS hash function + * @ena_dev: ENA communication layer struct + * + * Return the current hash function. + * @return: 0 or one of the ena_admin_hash_functions values. + */ +int ena_com_get_current_hash_function(struct ena_com_dev *ena_dev); + /* ena_com_fill_hash_function - Fill RSS hash function * @ena_dev: ENA communication layer struct * @func: The hash function (Toeplitz or crc) diff --git a/drivers/net/ethernet/amazon/ena/ena_ethtool.c b/drivers/net/ethernet/amazon/ena/ena_ethtool.c index 9a7a6ef39f9a..452b0e770370 100644 --- a/drivers/net/ethernet/amazon/ena/ena_ethtool.c +++ b/drivers/net/ethernet/amazon/ena/ena_ethtool.c @@ -736,6 +736,9 @@ static int ena_set_rxfh(struct net_device *netdev, const u32 *indir, } switch (hfunc) { + case ETH_RSS_HASH_NO_CHANGE: + func = ena_com_get_current_hash_function(ena_dev); + break; case ETH_RSS_HASH_TOP: func = ENA_ADMIN_TOEPLITZ; break; From 886d2089276e40d460731765083a741c5c762461 Mon Sep 17 00:00:00 2001 From: Sameeh Jubran Date: Tue, 11 Feb 2020 15:17:50 +0000 Subject: [PATCH 11/12] net: ena: ethtool: use correct value for crc32 hash Up till kernel 4.11 there was no enum defined for crc32 hash in ethtool, thus the xor enum was used for supporting crc32. Fixes: 1738cd3ed342 ("net: ena: Add a driver for Amazon Elastic Network Adapters (ENA)") Signed-off-by: Sameeh Jubran Signed-off-by: David S. Miller --- drivers/net/ethernet/amazon/ena/ena_ethtool.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/net/ethernet/amazon/ena/ena_ethtool.c b/drivers/net/ethernet/amazon/ena/ena_ethtool.c index 452b0e770370..ced1d577b62a 100644 --- a/drivers/net/ethernet/amazon/ena/ena_ethtool.c +++ b/drivers/net/ethernet/amazon/ena/ena_ethtool.c @@ -693,7 +693,7 @@ static int ena_get_rxfh(struct net_device *netdev, u32 *indir, u8 *key, func = ETH_RSS_HASH_TOP; break; case ENA_ADMIN_CRC32: - func = ETH_RSS_HASH_XOR; + func = ETH_RSS_HASH_CRC32; break; default: netif_err(adapter, drv, netdev, @@ -742,7 +742,7 @@ static int ena_set_rxfh(struct net_device *netdev, const u32 *indir, case ETH_RSS_HASH_TOP: func = ENA_ADMIN_TOEPLITZ; break; - case ETH_RSS_HASH_XOR: + case ETH_RSS_HASH_CRC32: func = ENA_ADMIN_CRC32; break; default: From c207979f5ae10ed70aff1bb13f39f0736973de99 Mon Sep 17 00:00:00 2001 From: Arthur Kiyanovski Date: Tue, 11 Feb 2020 15:17:51 +0000 Subject: [PATCH 12/12] net: ena: ena-com.c: prevent NULL pointer dereference comp_ctx can be NULL in a very rare case when an admin command is executed during the execution of ena_remove(). The bug scenario is as follows: * ena_destroy_device() sets the comp_ctx to be NULL * An admin command is executed before executing unregister_netdev(), this can still happen because our device can still receive callbacks from the netdev infrastructure such as ethtool commands. * When attempting to access the comp_ctx, the bug occurs since it's set to NULL Fix: Added a check that comp_ctx is not NULL Fixes: 1738cd3ed342 ("net: ena: Add a driver for Amazon Elastic Network Adapters (ENA)") Signed-off-by: Sameeh Jubran Signed-off-by: Arthur Kiyanovski Signed-off-by: David S. Miller --- drivers/net/ethernet/amazon/ena/ena_com.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/drivers/net/ethernet/amazon/ena/ena_com.c b/drivers/net/ethernet/amazon/ena/ena_com.c index 0f93d1092435..1fb58f9ad80b 100644 --- a/drivers/net/ethernet/amazon/ena/ena_com.c +++ b/drivers/net/ethernet/amazon/ena/ena_com.c @@ -200,6 +200,11 @@ static void comp_ctxt_release(struct ena_com_admin_queue *queue, static struct ena_comp_ctx *get_comp_ctxt(struct ena_com_admin_queue *queue, u16 command_id, bool capture) { + if (unlikely(!queue->comp_ctx)) { + pr_err("Completion context is NULL\n"); + return NULL; + } + if (unlikely(command_id >= queue->q_depth)) { pr_err("command id is larger than the queue size. cmd_id: %u queue size %d\n", command_id, queue->q_depth);